WO2005120497A2 - Compounds having activity in increasing ion transport by mutant-cftr and uses thereof - Google Patents
Compounds having activity in increasing ion transport by mutant-cftr and uses thereof Download PDFInfo
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- WO2005120497A2 WO2005120497A2 PCT/US2005/019346 US2005019346W WO2005120497A2 WO 2005120497 A2 WO2005120497 A2 WO 2005120497A2 US 2005019346 W US2005019346 W US 2005019346W WO 2005120497 A2 WO2005120497 A2 WO 2005120497A2
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K31/00—Medicinal preparations containing organic active ingredients
- A61K31/33—Heterocyclic compounds
- A61K31/395—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins
- A61K31/40—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil
- A61K31/403—Heterocyclic compounds having nitrogen as a ring hetero atom, e.g. guanethidine or rifamycins having five-membered rings with one nitrogen as the only ring hetero atom, e.g. sulpiride, succinimide, tolmetin, buflomedil condensed with carbocyclic rings, e.g. carbazole
- A61K31/404—Indoles, e.g. pindolol
- A61K31/405—Indole-alkanecarboxylic acids; Derivatives thereof, e.g. tryptophan, indomethacin
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P43/00—Drugs for specific purposes, not provided for in groups A61P1/00-A61P41/00
Definitions
- the cystic fibrosis transmembrane conductance regulator protein is a cAMP- activated chloride (CF) channel expressed in epithelial cells in mammalian airways, intestine, pancreas and testis.
- CFTR is the chloride-channel responsible for cAMP-mediated CI " secretion.
- Hormones such as a ⁇ -adrenergic agonist, or toxins, such as cholera toxin, lead to an increase in cAMP, activation of cAMP-dependent protein kinase, and phosphorylation of the CFTR CI " channel, which causes the channel to open.
- CFTR is predominantly located in epithelia where it provides a pathway for the movement of CF ions across the apical membrane and a key point at which to regulate the rate of transepithelial salt and water transport.
- CFTR chloride channel function is associated with a wide spectrum of disease, including cystic fibrosis (CF) and with some forms of male infertility, polycystic kidney disease and secretory diarrhea.
- the hereditary lethal disease CF is caused by mutations in the gene encoding the CFTR protein, a cAMP-activated CI " channel expressed in airway, intestinal, pancreatic, and other secretory and absorptive epithelia.
- the principal clinical problem in CF is recurrent lung infections resulting in progressive deterioration in lung function.
- the most common CFTR mutation, deletion of phenylalanine-508 ( ⁇ F508-CFTR) is present in at least one allele in about 90 % of CF patients (Egan et al., (2004) Science 304:600-602).
- ⁇ F508-CFTR causes CI " impermeability because it is not processed correctly, causing it to be retained at the endoplasmic reticulum (rather than the plasma membrane). ⁇ F508-CFTR also has reduced intrinsic CI " conductance relative to wild type CFTR.
- a sustained increase in intracellular calcium concentration by thapsigargin also corrects defective ⁇ F508-CFTR processing (Egan et al., (2002) Nature Med. 8, 485-492), possibly by interfering with interactions with molecular chaperones.
- Compounds like phenylbutryate facilitate ⁇ F508-CFTR cellular processing by altering chaperone function and/or transcriptional enhancement (Rubenstein et al., (2000) Am. J. Physiol. 278, C259-C267; Kang et al., (2002) Proc. Natl. Acad. Sci. U.S.A. 99, 838-843).
- these approaches provide insight into mechanisms of ⁇ F508-CFTR retention at the endoplasmic reticulum, they probably do not offer clinically-useful therapies.
- ⁇ F508-CFTR has significantly impaired channel activity even when present at the cell plasma membrane (Dalemans et al., (1991) Nature 354, 526-528).
- Cell-attached patch- clamp measurements showed reduced ⁇ F508-CFTR open channel probability and prolonged closed times even with maximal cAMP stimulation (Haws et al., (1996) Am. J. Physiol. 270, C1544-C1555; Hwang et al., (1997) Am. J. Physiol. 273, C988-C998).
- Patch-clamp measurements in excised membranes indicated 7-fold reduced ⁇ F508-CFTR activation after phosphorylation compared to wildtype CFTR.
- the invention provides compositions, pharmaceutical preparations and methods for increasing activity (e.g., ion transport) of a mutant-cystic fibrosis transmembrane conductance regulator protein (e.g., ⁇ F508 CFTR, G551D-CFTR, G1349D-CFTR, or Dl 152H-CFTR) that are useful for the treatment of cystic fibrosis (CF).
- a mutant-cystic fibrosis transmembrane conductance regulator protein e.g., ⁇ F508 CFTR, G551D-CFTR, G1349D-CFTR, or Dl 152H-CFTR
- the compositions and pharmaceutical preparations of the invention may comprise one or more phenylglycine- containing compounds or sulfonamide-containing compounds of the invention, or an analog or derivative thereof.
- the invention provides for a pharmaceutical composition
- a pharmaceutical composition comprising a compound of formula (I):
- n R] is independently chosen from a substituted or unsubstituted phenyl group or a substituted or unsubstituted heteroaromatic group, or a cyclic or acyclic alkyl group
- R 2 is independently chosen form a hydrogen, a alkyl group, an ether group, a halogen, or a perfluoroalkyl group
- R 3 is independently chosen from a hydrogen or an alkyl group
- R-t is independently chosen from a substituted or unsubstituted heteroaromatic group, or a alkanoyl-amine group; or a pharmaceutically acceptable derivative thereof, as an individual stereoisomer or a mixture thereof; or a pharmaceutically acceptable salt thereof.
- the composition further includes at least one of a pharmaceutically acceptable carrier, a pharmaceutically acceptable diluent, a pharmaceutically acceptable excipient and a pharmaceutically acceptable adjuvant.
- the composition does not contain detectable dimethyl sulfoxide.
- the compound is chosen from: 2- [(2- 1 H-Indol-3 -yl-acetyl)-methyl-amino] -N-(4-isopropyl-phenyl)-2-phenyl- acetamide; 2-[(2-lH-Indol-3-yl-acetyl)-methyl-amino]-N-(4-isopropyl-phenyl)-2-(4- methoxy-phenyl)-acetamide; 2-[(2-lH-Indol-3-yl-acetyl)-methyl-amino]-N-(4-methoxy- phenyl)-2-phenyl-acetamide; 2-[(2-lH-Indol-3-yl-acetyl)-methyl-amino]-2,N-bis-(4- methoxy-phenyl)-acetamide; N-(2,3-Dihydro-benzo[ 1 ,4]dioxi
- Ri is chosen from a phenyl group substituted by a hydrogen, a methyl group, an isobutanyl group, or a methoxyl group.
- R is chosen from a hydrogen, a methyl group, or a methoxyl group.
- R 3 is chosen from a hydrogen or a methyl group.
- R is chosen from an indole group or an alkanoylamino group.
- R ⁇ is independently chosen from a substituted or unsubstituted heteroaromatic group
- R 2 is independently chosen form a hydrogen, a alkyl group, or an ether group
- R 3 is independently chosen from a hydrogen or an alkyl group
- j is independently chosen from a substituted or unsubstituted heteroaromatic group, or a alkanoylamino group.
- R$ is a 2,3-dihydro- benzo[l,4]dioxine group.
- R 2 is chosen from a hydrogen, a methyl group, or a methoxyl group.
- R 3 is chosen from a hydrogen or a methyl group.
- R 4 is chosen from an indole group or an acetylamino group.
- the invention also provides for a pharmaceutical composition
- a pharmaceutical composition comprising a compound of formula (II):
- Ri is independently chosen form a hydrogen, an alkyl group unsubstituted or substituted by an alkoxy group
- R 2 is independently chosen from a hydrogen or a substituted or unsubstituted phenyl group
- R 3 is independently selected from an alkyl group unsubstituted or substituted by an alkoxy group, a substituted or unsubstituted hydrocarbon cyclic ring group, or a substituted or unsubstituted heterocyclic ring; or a pharmaceutically acceptable derivative thereof, as an individual stereoisomer or a mixture thereof; or a pharmaceutically acceptable salt thereof.
- the composition further includes at least one of a pharmaceutically acceptable carrier, a pharmaceutically acceptable diluent, a pharmaceutically acceptable excipient and a pharmaceutically acceptable adjuvant.
- the composition does not contain detectable dimethyl sulfoxide.
- R 2 is chosen from a methyl group, an ethyl group, or a propylene group.
- R 3 is chosen from a butyl group, a propylene group, an isopentyl group, a methoxy-propane group, a cyclopentyl group, a cylcohexyl group, a 2-methyl-furan group, or a 2-methyl-tetrahydro-furan group.
- the compound of formula (II) is a compound of formula (Ila):
- R is a substituted or unsubstituted heterocycloalkyl group containing a nitrogen atom, wherein the heterocycloalkyl group is linked to the sulfur atom by the nitrogen atom of the heterocycloalkyl group, a substituted or unsubstituted heterocyclic group;
- R 3 is independently selected from an alkyl group unsubstituted or substituted by an alkoxy group, a substituted or unsubstituted hydrocarbon cyclic ring group, or a substituted or unsubstituted heterocyclic ring.
- R* is chosen from a l,4-Dioxa-8-aza- spiro[4.5]decane group or a 2,3-Dihydro-lH-indole group.
- R 3 is chosen from a butyl group, a propylene group, an isopentyl group, a 3-methoxy-propyl group, a cyclopentyl group, a cylcohexyl group, a 2-methyl-furan group, or a 2-methyl- tetrahydrofuran group.
- the compound is chosen from: 6-[(2- Ethoxy-phenyl)-methyl-sulfamoyl]-4-oxo-l,4-dihydro-quinoline-3-carboxylic acid allylamide; 6-(Ethyl-phenyl-sulfamoyl)-4-oxo-l,4-dihydro-quinoline-3-carboxylic acid (3- methoxy-propyl)-amide; 6-(Methyl-m-tolyl-sulfamoyl)-4-oxo- 1 ,4-dihydro-quinoline-3 - carboxylic acid (pyridin-2-ylmethyl)-amide; 6-(Methyl-m-tolyl-sulfamoyl)-4-oxo-l,4- dihydro-quinoline-3-carboxylic acid (2-cyclohex-l-enyl-ethyl)-amide; 6-(l,4-Dioxa-8
- the invention also provides for a method of treating a subject having a condition associated with mutant-CFTR, the method including administering to the subject a therapeutically effective amount of a compound selected from the compounds of the present invention.
- the condition is cystic fibrosis.
- the subject after treatment, has a decrease in mucous or bacterial titer in their lungs, a decrease in coughing or wheezing, a decrease in pancreatic insufficiency, or a decrease in electrolyte levels in their sweat.
- the subject is a non-human animal. In embodiments of particular interest the animal is a mammal.
- the mutant-CFTR is ⁇ F508-CFTR, G551D-CFTR, G1349D-CFTR, or Dl 152H-CFTR.
- the invention also provides for a method of increasing ion permeability of a cell producing a mutant-CFTR protein, the method including contacting the cell with a compound in an amount effective to increase ion permeability of said cell, wherein the compound is selected from the compounds of the present invention.
- the cell contains a recombinant expression cassette that encodes said mutant-CFTR protein.
- the cell contains a genome that encodes said mutant-CFTR protein.
- the ion permeability increases an ion transporting activity that increases a rate of transport of ions across the plasma membrane of said cell.
- mutant-CFTR is ⁇ F508-CFTR, G551D-CFTR, G1349D-CFTR, or D1152H-CFTR.
- FIG. 1 shows the details of identification of the subject compounds.
- Panel A is a schematic representation of a high-throughput screening procedure used in the subject methods.
- Cells co-expressing mutant-CFTR and the halide-sensitive fluorescent protein YFP-H148Q/I152L were grown for 24 h at 27 °C (to give plasma membrane mutant-CFTR expression).
- test compounds 2.5 ⁇ M
- forskolin (20 ⁇ M) were added, and I " influx was assayed from the time course of YFP-H148Q/I152L fluorescence after adding I " to the external solution.
- Panel B shows the original traces showing quenching of cellular YFP fluorescence by I " addition with saline alone, and after additions of forskolin (20 ⁇ M) alone, or forskolin plus genistein (50 ⁇ M), compound S-1 (2.5 ⁇ M) or compound P-1 (2.5 ⁇ M).
- FIG. 2 shows the synthesis and structure activity analysis of the subject compound.
- Panel A shows the structures of an exemplary phenylglycine containing compound (denoted as P-1) and an exemplary sulfonamide containing compound (denoted as S-1).
- Panel B top portion, shows the synthesis of the phenylglycine containing compound P-1.
- Panel A bottom portion, shows the synthesis of the sulfonamide containing compound S-3. Conditions: d. diethyl ethoxymethylene-malonate, 140 °C, 1 h, 95%; e. cat. 7-chlorobenzoic acid. Ph 2 O, 250 °C, 45%; f. o-methoxybenzyl-amine, neat, 180 °C, 35%. Panel C shows the conclusions from structure-activity relationship analysis of the phenylglycine containing compounds and the sulfonamide containing compounds.
- FIG. 3 provides dose response analysis of the subject compounds.
- Panel A is a graph showing I " influx rates (d[F]/dt) for phenylglycine containing compounds.
- Panel B is a graph showing I " influx rates (d[I " ]/dt) for sulfonamide containing compounds.
- FIG. 5 provides the results of Ussing chamber experiments.
- Panel A provides representative traces showing potentiation of the response of ⁇ F508-CFTR to forskolin in the absence (upper graph) or presence (lower graph) of a phenylglycine containing compound (P-1).
- Panel B of Fig. 5 shows a summary of similar experiments for P-1 and a sulfonamide containing compound (S-1) which show significant incrase in current induced by low concentrations of forskolin.
- Fig. 6 shows the specificity of the subject compounds.
- Panel A shows intracellular cAMP concentration after forskolin addition with and without compounds P-1 and S-1 (2 ⁇ M).
- Panel B shows MDR-1 activity shown as rhodamine 123 accumulation in multidrug sensitive (9HTEo-) and multidrug resistant (9HTEo-/Dx) cells. Significant accumulation was found in 9HTEo-/Dx cells for verapamil (100 ⁇ M) but not for compounds P-1 and S-1 (5 ⁇ M).
- Panel C shows activation of CI " current by apical UTP in polarized human bronchial epithelia. Pretreatment with ⁇ F508-CFTR activators (2 ⁇ M) did not affect the maximum current or time-course of the UTP response.
- FIG. 7 provides graphs illustrating representative examples of potentiator effects as detected by patch-clamp analysis.
- Panel A shows cell-attached patch-clamp recordings of ⁇ F508-CFTR channel activity in the presence of forskolin (20 ⁇ M) (top portion) and after addition of the phenylglycine containing compound P-1 (100 nM) or the sulfonamide containing compound S-1 (bottom portion, lOOnM).
- Panel B is a series of graphs summarizing the average averaged channel open probabilities (Po) (left), mean closed time (T c )(middle), and mean open time (T 0 )(right) in the presence of forskolin alone or in combination with indicated compounds from the data of Panel A.
- FIG. 8 is a set of graphs showing stimulation of CI- secretion in CF human airway epithelial cells.
- Panel A shows ⁇ F508-CFTR activation in nasal epithelial cells from a ⁇ F508-CFTR homozygous subject after addition of compound P-1 (left panel, bottom portion), compound S-1 (right panel, bottom portion) in the presence of forskolin following addition of amiloride to block epithelial sodium channels, or genistein at either 37 °C (left panel, top portion) or 27 °C (right panel, top portion).
- Panel B shows G551D-CFTR activation in nasal epithelial cells from a G551D-CFTR homozygous subject after addition of compound P-1.
- Panel C shows Dl 152H-CFTR activation in nasal epithelial cells from a Dl 152H-CFTR homozygous subject after addition of compound P-1.
- FIG. 9 shows results of activiation of G55 ID- and GI 349D-CFTR mutants.
- Panels A and B show CFTR-mediated chloride currents measured in epithelial cells expressing either G551D-CFTR (Panel A) or G1349D-CFTR (Panel B) in response to the addition of either the phenylglycine containing compound P-1 (bottom portion of each panel) or genestein (top portion of each panel) in the presence of forskolin.
- FIG. 10 is a set of graphs showing CFTR-mediated chloride currents measured in nasal polyp epithelial cells from a CF patient with G55 ID-CFTR mutation in response to the addition of either the phenylglycine containing compound P-1 (right panel) or genestein (left panel) in the presence of forskolin following addition of amiloride to block epithelial sodium channels.
- FIG. 11 shows liquid chromatography / mass spectrometry analysis of microsomal metabolites of compounds P-1 and S-3, and rat pharmacokinetics.
- Panel A shows results of of the liquid chromatography / mass spectrometry analysis. Microsomes were incubated with compounds P-1 or S-3 (each 10 ⁇ M) in the absence (control) or presence of NADPH for 1 hour at 37 °C. HPLC chromatograms at 256 nm for control (left) and NADPH (right) samples, and corresponding ion current chromatograms for positive ion electrospray mass spectrometry for indicated m/z (middle). Ml, metabolite 1; M2, metabolite 2.
- Panel B shows pharmacokinetic analysis.
- the left panel shows the HPLC chromatogram of compounds P-1 and S-3 demonstrating assay sensitivity to better than 50 nM.
- the invention provides compositions, pharmaceutical preparations and methods for activation of mutant cystic fibrosis transmembrane conductance regulator protein (e.g., ⁇ F508-CFTR, G551D-CFTR, G1349D-CFTR, or Dl 152H-CFTR) that are useful for the study and treatment of cystic fibrosis (CF).
- the invention also features methods of use of such compositions in increasing activity of mutant CFTR in a cell, e.g., by increasing ion transport by mutant CFTR.
- compositions and pharmaceutical preparations of the invention may comprise one or more compounds, which compounds can be a phenylglycine containing compound, or an analog or derivative thereof, and a sulfonamide containing compound, or an analog or derivative thereof.
- the compositions and pharmaceutical preparations of the invention may additionally comprise one or more pharmaceutically acceptable carriers, excipients and/or adjuvants.
- the invention provides methods of increasing ion transport in a mutant-CFTR, e.g., ⁇ F508-CFTR G551D-CFTR, G1349D-CFTR, or Dl 152H-CFTR, in a cell by contacting the cell with an effective amount of one or more of the compounds set forth above.
- the invention also provides a method of treating a patient suffering from a mutant-CFTR-mediated disease or condition, for example CF, by administering to the patient an efficacious amount of one or more of the compounds set forth above. Kits for use in the subject methods are also provided.
- the invention is based on the discovery of a genus of phenylglycine containing compounds that increase ion transport by mutant-CFTR with high affinity.
- the invention is based on the discovery of a genus of sulfonamide containing compounds that increase ion transport by mutant-CFTR with high affinity.
- a “mutant cystic fibrosis transmembrane conductance regulator protein”, or “mutant- CFTR” is the protein that results from a mutation, e.g., deletion mutation, insertion mutation, or point (substitution) mutation of the CFTR gene product relative to wildtype.
- a “mutant cystic fibrosis transmembrane conductance regulator protein”, or “mutant- CFTR” is dysfunctional as compared to a functional (e.g., wildtype) CFTR where the dysfunction can encompass one or more of the following: (i) aberrant CFTR production (e.g., at the level of transcription or translation); (ii) aberrant folding and/or trafficking; (iii) abnormal regulation of conductance; (iv) decreases in chloride conductance; (v) reduction in synthesis; and the like.
- a “mutant-CFTR gene” is a gene, or coding sequence, which encodes a mutant-CFTR.
- the terms “genome” and “gene” are used interchangeably, e.g. "genome that encodes mutant-CFTR” and “gene that encodes mutant-CFTR”.
- a "gating defective mutant cystic fibrosis transmembrane conductance regulator protein”, or “gating defective mutant-CFTR” is a mutant-CFTR that is present on the cell surface and is defective in gating of ions through the channel (e.g., regulation of ion transport).
- a “gating defective mutant-CFTR” encompasses dysfunctions associated with (i) abnormal regulation of conductance; and or (ii) decreases in chloride conductance.
- a "mutant-CFTR protein-mediated condition” means any condition, disorder or disease, or symptom of such condition, disorder, or disease, that results from or is correlated to the presence of a mutant-CFTR, e.g., ⁇ F508-CFTR, e.g., chloride ion impermeability caused by reduced activity of ⁇ F508-CFTR in ion transport relative to a wild-type CFTR.
- a mutant-CFTR e.g., ⁇ F508-CFTR, e.g., chloride ion impermeability caused by reduced activity of ⁇ F508-CFTR in ion transport relative to a wild-type CFTR.
- a "mutant-CFTR protein-mediated condition” encompasses conditions in an affected subject which are associated with the presence of a ⁇ F508-CFTR mutation on at least one allele, thus including subjects that carry a ⁇ F508-CFTR mutation on both alleles as well as compound heterozygous subjects having two different mutant forms of CFTR, e.g., a subject with one copy of ⁇ F508-CFTR and a copy of different mutant form of CFTR.
- mutant-CFTR activity e.g., activation of mutant-CFTR ion transport.
- ⁇ F508- CFTR is correlated to the presence of cystic fibrosis (CF), and a description of this disease, including its symptoms, is found in Accession No. 602421 (entitled cystic fibrosis transmembrane conductance regulator; CFTR), and Accession No. 219700 (entitled Cystic fibrosis; CF) of the Online Mendelian Inheritance of Man database, as found at the world wide website of the National Institute of Health at ncbi.nlm.nih.gov.
- mutant-CFTR protein-mediated conditions include meconium ileus, liver disease including biliary tract obstruction and stenosis, pancreatic insufficiency, pulmonary disease including chronic Pseudomonas aeruginosa infections and other infections of the lung, infertility associated with abnormal vas deferens development or abnormal cervical mucus, and carcinoma including adenocarcinoma.
- Many subjects that have a mutant-CFTR protein-mediated condition are homozygous for a gene encoding a ⁇ F508-CFTR protein.
- a " ⁇ F508-cystic fibrosis transmembrane conductance regulator protein”, or “ ⁇ F508- CFTR” is the protein that results from the deletion of a phenylalanine residue at amino acid position 508 of the CFTR gene product.
- a “ ⁇ F508-CFTR gene” is a gene, or coding sequence, which encodes ⁇ F508-CFTR.
- a ⁇ F508-CFTR gene usually results from deletion of three nucleotides corresponding to the phenylalanine residue at amino acid position 508 of the encoded CFTR gene product.
- the terms “genome” and “gene” are used interchangeably, e.g.
- gene that encodes ⁇ F508-CFTR and “gene that encodes ⁇ F508-CFTR”.
- a gene that encodes ⁇ F508-CFTR see, e.g. WO 91/02796.
- a "mutant-CFTR activator” as used herein is a compound that increases the level of ion transport by a mutant-CFTR relative to ion transport in the absence of the compound, and particularly with respect to transport of chloride ions.
- CFTR activators of the invention of particular interest are those that are specific mutant-CFTR activators, e.g., compounds that activate mutant-CFTR activity rather than affecting CFTR cellular misprocessing.
- Mutant-CFTR activators are usually high-affinity mutant-CFTR activators, e.g., have an affinity for mutant-CFTR of at least about one micromolar, about one to five micromolar, about 200 nanomolar to one micromolar, about 50 nanomolar to 200 nanomolar, or below 50 nanomolar.
- a "gating defective mutant-CFTR activator” as used herein is a compound that increases the level of ion transport by a gating defective mutant-CFTR relative to ion transport in the absence of the compound, and particularly with respect to transport of chloride ions.
- CFTR activators of the invention of particular interest are those that are specific gating defective mutant-CFTR activators, e.g., compounds that activate gating defective mutant-CFTR activity rather than affecting, for example, CFTR cellular misprocessing.
- Gating defective mutant-CFTR activators are usually high-affinity activators of gating defective mutant-CFTRs, e.g., have an affinity for a gating defective mutant-CFTR (e.g., ⁇ F508-CFTR, G551D-CFTR, G1349D-CFTR, or Dl 152H-CFTR) of at least about one micromolar, about one to five micromolar, about 200 nanomolar to one micromolar, about 50 nanomolar to 200 nanomolar, or below 50 nanomolar.
- a gating defective mutant-CFTR e.g., ⁇ F508-CFTR, G551D-CFTR, G1349D-CFTR, or Dl 152H-CFTR
- a " ⁇ F508-CFTR activator” as used herein is a compound that increases the level of ion transport by ⁇ F508-CFTR relative to ion transport in the absence of the compound, and particularly with respect to transport of chloride ions.
- CFTR activators of the invention of particular interest are those that are specific ⁇ F508-CFTR activators, e.g., compounds that activate ⁇ F508-CFTR activity rather than affecting CFTR cellular misprocessing.
- ⁇ F508- CFTR activators are usually high-affinity ⁇ F508-CFTR activators, e.g., have an affinity for ⁇ F508-CFTR of at least about one micromolar, about one to five micromolar, about 200 nanomolar to one micromolar, about 50 nanomolar to 200 nanomolar, or below 50 nanomolar.
- a “potentiator” refers to a compound that increases a basal level of ion transport by a mutant-CFTR (e.g,. ⁇ F508CFTR, G551D- CFTR, G1349D-CFTR, or Dl 152H-CFTR), where the mutant CFTR (in the absence of the compound) exhibits aberrantly low levels of ion transport relative to wildtype CFTR.
- a mutant-CFTR potentiator refers to a potentiator compound that, provides for increased level of ion transport by a mutant-CFTR relative to ion transport capability of the mutant-CFTR in the absence of the compounds.
- a mutant-CFTR corrector is a compound that increases the level of ion transport by a mutant-CFTR relative to ion transport in the absence of the compound by correcting the underlying defect of the CFTR polypeptide, e.g., a defect that results from post-translational mis-processing (e.g., misfolding).
- CFTR correctors of the invention of particular interest are those that facilitate correction of specific mutant-CFTRs.
- Mutant-CFTR correctors are usually exhibit high- affinity for one or more mutant-CFTRs, e.g., have an affinity for mutant-CFTR of at least about one micromolar, about one to five micromolar, about 200 nanomolar to one micromolar, about 50 nanomolar to 200 nanomolar, or below 50 nanomolar.
- in combination can also refer to regimen involving administration of two or more compounds.
- “In combination with” as used herein also refers to administration of two or more compounds which may be administered in the same or different formulations, by the same of different routes, and in the same or different dosage form type.
- isolated compound means a compound which has been substantially separated from, or enriched relative to, other compounds with which it occurs in nature. Isolated compounds are usually at least about 80%, more usually at least 90% pure, even more preferably at least 98% pure, most preferably at least about 99% pure, by weight.
- the present invention is meant to comprehend diastereomers as well as their racemic and resolved, enantiomerically pure forms and pharmaceutically acceptable salts thereof.
- Treating" or “treatment” of a condition or disease includes: (1) preventing at least one symptom of the conditions, i.e., causing a clinical symptom to not significantly develop in a mammal that may be exposed to or predisposed to the disease but does not yet experience or display symptoms of the disease, (2) inhibiting the disease, i.e., arresting or reducing the development of the disease or its symptoms, or (3) relieving the disease, i.e., causing regression of the disease or its clinical symptoms.
- a “therapeutically effective amount” or “efficacious amount” means the amount of a compound that, when administered to a mammal or other subject for treating a disease, is sufficient to effect such treatment for the disease.
- the “therapeutically effective amount” will vary depending on the compound, the disease and its severity and the age, weight, etc., of the subject to be treated.
- subject and patient mean a member or members of any mammalian or non-mammalian species that may have a need for the pharmaceutical methods, compositions and treatments described herein.
- Subjects and patients thus include, without limitation, primate (including humans), canine, feline, ungulate (e.g., equine, bovine, swine (e.g., pig)), avian, and other subjects.
- primate including humans
- canine feline
- ungulate e.g., equine, bovine, swine (e.g., pig)
- avian avian
- Humans and non-human animals having commercial importance are of particular interest.
- mammalian means a member or members of any mammalian species, and includes, by way of example, canines; felines; equines; bovines; ovines; rodentia, etc. and primates, particularly humans.
- Non-human animal models, particularly mammals, e.g. primate, murine, lagomorpha, etc. may be used for experimental investigations.
- unit dosage form refers to physically discrete units suitable as unitary dosages for human and animal subjects, each unit containing a predetermined quantity of compounds of the present invention calculated in an amount sufficient to produce the desired effect in association with a pharmaceutically acceptable diluent, carrier or vehicle.
- the specifications for the novel unit dosage forms of the present invention depend on the particular compound (e.g., phenylglycine-containing compound or sulfonamide containing compound) employed and the effect to be achieved, and the pharmacodynamics associated with each compound in the host.
- physiological conditions is meant to encompass those conditions compatible with living cells, e.g., predominantly aqueous conditions of a temperature, pH, salinity, etc. that are compatible with living cells.
- a "pharmaceutically acceptable excipient,” “pharmaceutically acceptable diluent,” “pharmaceutically acceptable carrier,” and “pharmaceutically acceptable adjuvant” means an excipient, diluent, carrier, and adjuvant that are useful in preparing a pharmaceutical composition that are generally safe, non-toxic and neither biologically nor otherwise undesirable, and include an excipient, diluent, carrier, and adjuvant that are acceptable for veterinary use as well as human pharmaceutical use.
- “A pharmaceutically acceptable excipient, dileuent, carrier and adjuvant” as used in the specification and claims includes both one and more than one such excipient, dileuent, carrier, and adjuvant.
- a "pharmaceutical composition” is meant to encompass a composition suitable for administration to a subject, such as a mammal, especially a human.
- a “pharmaceutical composition” is sterile, and preferably free of contaminants that are capable of eliciting an undesirable response within the subject (e.g., the compound(s) in the pharmaceutical composition is pharmaceutical grade).
- Pharmaceutical compositions can be designed for administration to subjects or patients in need thereof via a number of different routes of administration including oral, buccal, rectal, parenteral, intraperitoneal, intradermal, intracheal and the like.
- the composition is suitable for administration by a transdermal route, using a penetration enhancer other than DMSO.
- the pharmaceutical compositions are suitable for administration by a route other than transdermal administration.
- pharmaceutically acceptable derivatives of a compound of the invention include salts, esters, enol ethers, enol esters, acetals, ketals, orthoesters, hemiacetals, hemiketals, acids, bases, solvates, hydrates or prodrugs thereof.
- Such derivatives may be readily prepared by those of skill in this art using known methods for such derivatization.
- the compounds produced may be administered to animals or humans without substantial toxic effects and either are pharmaceutically active or are prodrugs.
- a "pharmaceutically acceptable salt” of a compound means a salt that is pharmaceutically acceptable and that possesses the desired pharmacological activity of the parent compound.
- Such salts include: (1) acid addition salts, formed with inorganic acids such as hydrochloric acid, hydrobromic acid, sulfuric acid, nitric acid, phosphoric acid, and the like; or formed with organic acids such as acetic acid, propionic acid, hexanoic acid, cyclopentanepropionic acid, glycolic acid, pyruvic acid, lactic acid, malonic acid, succinic acid, malic acid, maleic acid, fumaric acid, tartaric acid, citric acid, benzoic acid, 3-(4- hydroxybenzoyl)benzoic acid, cinnamic acid, mandelic acid, methanesulfonic acid, ethanesulfonic acid, 1 ,2-ethanedisulfonic acid, 2-hydroxyethanesulfonic acid, benzenes
- a "pharmaceutically acceptable ester" of a compound of the invention means an ester that is pharmaceutically acceptable and that possesses the desired pharmacological activity of the parent compound, and includes, but is not limited to, alkyl, alkenyl, alkynyl, aryl, heteroaryl, aralkyl, heteroaralkyl, cycloalkyl and heterocyclyl esters of acidic groups, including, but not limited to, carboxylic acids, phosphoric acids, phosphinic acids, sulfonic acids, sulfinic acids and boronic acids.
- a "pharmaceutically acceptable solvate or hydrate" of a compound of the invention means a solvate or hydrate complex that is pharmaceutically acceptable and that possesses the desired pharmacological activity of the parent compound, and includes, but is not limited to, complexes of a compound of the invention with one or more solvent or water molecules, or 1 to about 100, or 1 to about 10, or one to about 2, 3 or 4, solvent or water molecules.
- "Pro-drugs” means any compound that releases an active parent drug according to formula (I) in vivo when such prodrug is administered to a mammalian subject.
- Prodrugs of a compound of formula (I) are prepared by modifying functional groups present in the compound of formula (I) in such a way that the modifications may be cleaved in vivo to release the parent compound.
- Prodrugs include compounds of formula (I) wherein a hydroxy, amino, or sulfhydryl group in compound (I) is bonded to any group that may be cleaved in vivo to regenerate the free hydroxyl, amino, or sulfhydryl group, respectively.
- prodrugs include, but are not limited to esters (e.g., acetate, formate, and benzoate derivatives), carbamates (e.g., N,N-dimethylaminocarbonyl) of hydroxy functional groups in compounds of formula (I), and the like.
- esters e.g., acetate, formate, and benzoate derivatives
- carbamates e.g., N,N-dimethylaminocarbonyl
- organic group and "organic radical” as used herein means any carbon- containing group, including hydrocarbon groups that are classified as an aliphatic group, cyclic group, aromatic group, functionalized derivatives thereof and/or various combination thereof.
- aliphatic group means a saturated or unsaturated linear or branched hydrocarbon group and encompasses alkyl, alkenyl, and alkynyl groups, for example.
- alkyl group means a substituted or unsubstituted, saturated linear or branched hydrocarbon group or chain (e.g., d to C 8 ) including, for example, methyl, ethyl, isopropyl, tert-butyl, heptyl, iso-propyl, n-octyl, dodecyl, octadecyl, amyl, 2-ethylhexyl, and the like.
- Suitable substituents include carboxy, protected carboxy, amino, protected amino, halo, hydroxy, protected hydroxy, nitro, cyano, monosubstituted amino, protected monosubstituted amino, disubstituted amino, C ⁇ to C alkoxy, C ⁇ to C 7 acyl, Ci to C 7 acyloxy, and the like.
- substituted alkyl means the above defined alkyl group substituted from one to three times by a hydroxy, protected hydroxy, amino, protected amino, cyano, halo, trifioromethyl, mono-substituted amino, di-substituted amino, lower alkoxy, lower alkylthio, carboxy, protected carboxy, or a carboxy, amino, and/or hydroxy salt.
- substituted (cycloalkyl)alkyl and “substituted cycloalkyl” are as defined below substituted with the same groups as listed for a "substituted alkyl" group.
- alkenyl group means an unsaturated, linear or branched hydrocarbon group with one or more carbon- carbon double bonds, such as a vinyl group.
- alkynyl group means an unsaturated, linear or branched hydrocarbon group with one or more carbon-carbon triple bonds.
- cyclic group means a closed ring hydrocarbon group that is classified as an alicyclic group, aromatic group, or heterocyclic group.
- alicyclic group means a cyclic hydrocarbon group having properties resembling those of aliphatic groups.
- aromatic group or aryl group means a mono- or polycyclic aromatic hydrocarbon group, and may include one or more heteroatoms, and which are further defined below.
- heterocyclic group means a closed ring hydrocarbon in which one or more of the atoms in the ring are an element other than carbon (e.g., nitrogen, oxygen, sulfur, etc.), and are further defined below.
- Organic groups may be functionalized or otherwise comprise additional functionalities associated with the organic group, such as carboxyl, amino, hydroxyl, and the like, which may be protected or unprotected.
- alkyl group is intended to include not only pure open chain saturated hydrocarbon alkyl substituents, such as methyl, ethyl, propyl, t-butyl, and the like, but also alkyl substituents bearing further substituents known in the art, such as hydroxy, alkoxy, alkylsulfonyl, halogen atoms, cyano, nitro, amino, carboxyl, etc.
- alkyl group includes ethers, esters, haloalkyls, nitroalkyls, carboxyalkyls, hydroxyalkyls, sulfoalkyls, etc.
- halo and halogen refer to the fluoro, chloro, bromo or iodo groups. There can be one or more halogen, which are the same or different. Halogens of particular interest include chloro and bromo groups.
- haloalkyl refers to an alkyl group as defined above that is substituted by one or more halogen atoms.
- the halogen atoms may be the same or different.
- dihaloalkyl refers to an alkyl group as described above that is substituted by two halo groups, which may be the same or different.
- trihaloalkyl refers to an alkyl group as describe above that is substituted by three halo groups, which may be the same or different.
- perhaloalkyl refers to a haloalkyl group as defined above wherein each hydrogen atom in the alkyl group has been replaced by a halogen atom.
- perfluoroalkyl refers to a haloalkyl group as defined above wherein each hydrogen atom in the alkyl group has been replaced by a fluoro group.
- cycloalkyl means a mono-, bi-, or tricyclic saturated ring that is fully saturated or partially unsaturated. Examples of such a group included cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, cycloheptyl, adamantyl, cyclooctyl, cis- or trans decalin, bicyclo[2.2.1]hept-2-ene, cyclohex-1-enyl, cyclopent-1-enyl, 1 ,4-cyclooctadienyl, and the like.
- (cycloalkyl)alkyl means the above-defined alkyl group substituted for one of the above cycloalkyl rings. Examples of such a group include (cyclohexyl)methyl, 3- (cyclopropyl)-n-propyl, 5-(cyclopentyl)hexyl, 6-(adamantyl)hexyl, and the like.
- substituted phenyl specifies a phenyl group substituted with one or more moieties, and in some instances one, two, or three moieties, chosen from the groups consisting of halogen, hydroxy, protected hydroxy, cyano, nitro, trifluoromethyl, d to C 7 alkyl, Ci to C alkoxy, C ⁇ to C 7 acyl, Ci to C 7 acyloxy, carboxy, oxycarboxy, protected carboxy, carboxymethyl, protected carboxymethyl, hydroxymethyl, protected hydroxymethyl, amino, protected amino, (monosubstituted)amino, protected (monosubstituted)amino, (disubstituted)amino, carboxamide, protected carboxamide, N-(Ci to C 6 alkyl)carboxamide, protected N-( Ci to C 6 alkyl)carboxamide, N,N-di(C !
- substituted phenyl includes a mono- or di(halo)phenyl group such as 2, 3 or 4-chlorophenyl, 2,6-dichlorophenyl, 2,5-dichlorophenyl, 3,4-dichlorophenyl, 2, 3 or 4-bromophenyl, 3,4-dibromophenyl, 3-chloro-4-fluorophenyl, 2, 3 or 4-fluorophenyl and the like; a mono or di(hydroxy)phenyl group such as 2, 3, or 4-hydroxyphenyl, 2,4- dihydroxyphenyl, the protected-hydroxy derivatives thereof and the like; a nitrophenyl group such as 2, 3, or 4-nitrophenyl; a cyanophenyl group, for example, 2, 3 or 4-cyanophenyl; a mono- or di(alkyl)phenyl group such as 2, 3, or 4-methylphenyl, 2,4-dimethylphenyl, 2, 3 or 4-
- substituted phenyl represents disubstituted phenyl groups wherein the substituents are different, for example, 3-methyl-4- hydroxyphenyl, 3-chloro-4-hydroxyphenyl, 2-methoxy-4-bromophenyl, 4-ethyl-2- hydroxyphenyl, 3-hydroxy-4-nitrophenyl, 2-hydroxy-4-chlorophenyl and the like.
- (substituted phenyl)alkyl means one of the above substituted phenyl groups attached to one of the above-described alkyl groups. Examples of include such groups as 2-phenyl-l-chloroethyl, 2-(4'-methoxyphenyl)ethyl, 4-(2',6'-dihydroxy phenyl)n- hexyl, 2-(5'-cyano-3'-methoxyphenyl)n-pentyl, 3-(2',6'-dimethylphenyl)n-propyl, 4-chloro-3- aminobenzyl, 6-(4'-methoxyphenyl)-3-carboxy(n-hexyl), 5-(4'-aminomethylphenyl)-3- (aminomethyl)n-pentyl, 5-phenyl-3-oxo-n-pent-l-yl, (4-hydroxynapth-2-yl)methyl and the like.
- aromatic refers to six membered carbocyclic rings.
- heteroaryl denotes optionally substituted five- membered or six-membered rings that have 1 to 4 heteroatoms, such as oxygen, sulfur and/or nitrogen atoms, in particular nitrogen, either alone or in conjunction with sulfur or oxygen ring atoms.
- the above optionally substituted five-membered or six-membered rings can optionally be fused to an aromatic 5 -membered or 6-membered ring system.
- the rings can be optionally fused to an aromatic 5 -membered or 6-membered ring system such as a pyridine or a triazole system, and preferably to a benzene ring.
- heteroaryl thienyl, furyl, pyrrolyl, pyrrolidinyl, imidazolyl, isoxazolyl, triazolyl, thiadiazolyl, oxadiazolyl, tetrazolyl, thiatriazolyl, oxatriazolyl, pyridyl, pyrimidyl, pyrazinyl, pyridazinyl, oxazinyl, triazinyl, thiadiazinyl tetrazolo, l,5-[b]pyridazinyl and purinyl, as well as benzo-fused derivatives, for example, benzoxazolyl, benzthiazolyl, benzimidazolyl and indolyl.
- Substituents for the above optionally substituted heteroaryl rings are from one to three halo, trihalomethyl, amino, protected amino, amino salts, mono-substituted amino, di- substituted amino, carboxy, protected carboxy, carboxylate salts, hydroxy, protected hydroxy, salts of a hydroxy group, lower alkoxy, lower alkylthio, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, (cycloalkyl)alkyl, substituted (cycloalkyl)alkyl, substituted (cycloalkyl)alkyl, phenyl, substituted phenyl, phenylalkyl, and (substituted phenyl)alkyl.
- Substituents for the heteroaryl group are as heretofore defined, or in the case of trihalomethyl, can be trifluoromethyl, trichloromethyl, tribromomethyl, or triiodomethyl.
- lower alkoxy means a Ci to c4 alkoxy group
- lower alkylthio means a Ci to C 4 alkylthio group.
- (monosubstituted)amino refers to an amino group with one substituent chosen from the group consisting of phenyl, substituted phenyl, alkyl, substituted alkyl, C ⁇ to C 4 acyl, C 2 to C 7 alkenyl, C 2 to C 7 substituted alkenyl, C 2 to C alkynyl, C to C ⁇ 6 alkylaryl, C to C 16 substituted alkylaryl and heteroaryl group.
- the (monosubstituted) amino can additionally have an amino-protecting group as encompassed by the term "protected (monosubstituted)amino."
- the term "(disubstituted)amino” refers to amino groups with two substituents chosen from the group consisting of phenyl, substituted phenyl, alkyl, substituted alkyl, Ci to C 7 acyl, C 2 to C 7 alkenyl, C 2 to C 7 alkynyl, C 7 to C ⁇ 6 alkylaryl, C 7 to C 16 substituted alkylaryl and heteroaryl. The two substituents can be the same or different.
- heteroaryl(alkyl) denotes an alkyl group as defined above, substituted at any position by a heteroaryl group, as above defined.
- heterocyclo group optionally mono- or di- substituted with an alkyl group means that the alkyl may, but need not, be present, and the description includes situations where the heterocyclo group is mono- or disubstituted with an alkyl group and situations where the heterocyclo group is not substituted with the alkyl group.
- isomers Compounds that have the same molecular formula but differ in the nature or sequence of bonding of their atoms or the arrangement of their atoms in space are termed “isomers.” Isomers that differ in the arrangement of their atoms in space are termed “stereoisomers.” Stereoisomers that are not mirror images of one another are termed “diastereomers” and those that are non-superimposable mirror images of each other are termed “enantiomers.” When a compound has an asymmetric center, for example, it is bonded to four different groups, a pair of enantiomers is possible.
- An enantiomer can be characterized by the absolute configuration of its asymmetric center and is described by the R- and S-sequencing rules of Cahn and Prelog, or by the manner in which the molecule rotates the plane of polarized light and designated as dextrorotatory or levorotatory (i.e., as (+) or (-)-isomers respectively).
- a chiral compound can exist as either individual enantiomer or as a mixture thereof. A mixture containing equal proportions of the enantiomers is called a "racemic mixture.”
- the compounds of this invention may possess one or more asymmetric centers; such compounds can therefore be produced as individual (R)- or (S)- stereoisomers or as mixtures thereof. Unless indicated otherwise, the description or naming of a particular compound in the specification and claims is intended to include both individual enantiomers and mixtures, racemic or otherwise, thereof.
- the methods for the determination of stereochemistry and the separation of stereoisomers are well-known in the art (see, e.g., the discussion in Chapter 4 of "Advanced Organic Chemistry", 4th edition J. March, John Wiley and Sons, New York, 1992). OVERVIEW
- the invention provides compounds that increase ion transport in a mutant-cystic fibrosis transmembrane conductance regulator protein (mutant-CFTR), e.g., ⁇ F508-CFTR, G551D-CFTR, G1349D-CFTR, or Dl 152H-CFTR, and methods of their use in treatment of mutant-CFTR-mediated diseases and conditions, e.g., cystic fibrosis (CF).
- mutant-CFTR mutant-cystic fibrosis transmembrane conductance regulator protein
- CFTR cystic fibrosis
- the invention provides high-affinity small-molecule compounds that increase CI " conductance in gating defective mutant-CFTRs, such as ⁇ F508-CFTR, G551D-CFTR, G1349D-CFTR, and Dl 152H-CFTR.
- the compounds contemplated by the invention include those of the following structural classes: (1) phenylglycine containing compounds; and (2) sulfonamide containing compounds.
- mutant-CFTR activating compounds A screening of 50,000 diverse compounds identified several compounds and analogs as effective mutant-CFTR potentiators.
- the subject compounds are unrelated chemically and structurally to previously known mutant-CFTR potentiator compounds.
- the invention provides compounds that increase ion transport mediated by mutant-CFTR. Without wishing to be bound by this theory, it is speculated, with respect to the ⁇ F508-CFTR, that the compounds act through direct interaction or binding mechanism with ⁇ F508-CFTR, most likely to a site on the first nucleotide binding domain of CFTR where the ⁇ F508 mutation site is located.
- the phenylglycine containing compounds describe herein comprise an aromatic- or heteroaromatic nitrogen, a substituted or unsubstituted phenyl glycine and a substituted or unsubstituted aryl group or a carbonyl group.
- the subject compounds are generally described by Formula (I) as follows: (I) where n R ⁇ is independently chosen from a substituted or unsubstituted phenyl group or a substituted or unsubstituted heteroaromatic group; R 2 is independently chosen form a hydrogen, a alkyl group, or an ether group; R 3 is independently chosen from a hydrogen or an alkyl group, and t is independently chosen from a substituted or unsubstituted heteroaromatic group; or a pharmaceutically acceptable derivative thereof, as an individual stereoisomer or a mixture thereof.
- Ri is independently chosen from an unsubstituted heteroaromatic group or a substituted phenyl group
- R 2 is independently chosen from a hydrogen, a alkyl group, or an ether group
- R 3 is independently chosen from a hydrogen or an alkyl group
- j is independently chosen form a unsubstituted heteroaromatic group or a or a isopropenylamine group.
- exemplary substitutions for Ri, R 2 , R 3 , and R 4 are described in more detail below.
- the phenylglycine containing compounds are generally described by Formula (I), wherein Ri is a substituted phenyl group.
- Such compounds are generally described by Formula (la) as follows:
- R 5 is independently chosen from a hydrogen, an alkyl group such as a substituted or unsubstituted, saturated linear or branched hydrocarbon group or chain (e.g., C ⁇ to C 8 ) including, e.g., methyl, ethyl, isopropyl, tert-butyl, heptyl, n-octyl, dodecyl, octadecyl, amyl, 2-ethylhexyl, or an ether group, such as a methoxyl group or an ethoxyl group;
- R 2 is independently chosen from a hydrogen, an alkyl group such as a substituted or unsubstituted, saturated linear or branched hydrocarbon group or chain (e.g., C ⁇ to Cg ) including, e.g., methyl, ethyl, isopropyl, tert-butyl, heptyl, n-oc
- R 5 is independently chosen from a hydrogen, a methyl group, an isobutanyl group, or a methoxyl group
- R 2 is independently chosen from a hydrogen, a methyl group, or a methoxyl group
- R 3 is independently chosen from a hydrogen or a methyl group
- j is independently chosen from an indole group or a isopropenylamine group.
- the phenylglycine containing compounds are generally described by Formula (I), wherein R is a heteroaryl group.
- Such compounds are generally described by Formula (lb) as follows:
- R f is independently chosen from a substituted or unsubstituted heteroaromatic group, such as a dihydro-benzodioxine group, such as a 2,3-dihydro-benzo[l,4]dioxine group;
- R 2 is independently chosen from a hydrogen, an alkyl group such as a substituted or unsubstituted, saturated linear or branched hydrocarbon group or chain (e.g., C ⁇ to Cg) including, e.g., methyl, ethyl, isopropyl, tert-butyl, heptyl, n-octyl, dodecyl, octadecyl, amyl, 2-ethylhexyl, or an ether group, such as a methoxyl group or an ethoxyl group;
- R 3 is independently chosen from a substituted or unsubstituted heteroaromatic group, such as an indole
- Re is a 2,3-dihydro-benzo[l,4]dioxine group
- R 2 is independently chosen from a hydrogen, a methyl group, or a methoxyl group
- R 3 is independently chosen from a hydrogen or a methyl group
- R-j is independently chosen from an indole group or a isopropenylamine group.
- the phenylglycine containing compounds may comprise a formula of the following:
- Sulfonamide containing compounds [0096]
- the sulfonamide containing compounds described herein comprise a substituted sulfonamide, a substituted heteroaromatic group, and a substituted formamide.
- the subject compounds are generally described by Formula (II) as follows:
- R ⁇ is independently chosen form a hydrogen, an alkyl group such as a substituted or unsubstituted, saturated linear or branched hydrocarbon group or chain (e.g., C ⁇ to C 8 ) including, e.g., methyl, ethyl, isopropyl, tert-butyl, heptyl, n-octyl, dodecyl, octadecyl, amyl, 2-ethylhexyl, or an ether group, such as a methoxyl group or an ethoxyl group;
- R 2 is independently chosen from a hydrogen or a substituted or unsubstituted phenyl group;
- R 3 is independently selected from a an alkyl group such as a substituted or unsubstituted, saturated linear or branched hydrocarbon group or chain (e.g., C ⁇ to C 8 ) including, e.g., methyl, ethyl
- R ⁇ is independently chosen from a hydrogen or an alkyl group
- R 2 is independently chosen form a substituted or unsubstituted phenyl group
- R3 is independently selected from a substituted or unsubstituted alkyl group, a substituted or unsubstituted hydrocarbon cyclic ring group, a substituted or unsubstituted (heteroaryl)alkyl group, a substituted or unsubstituted (cycloalkyl)alkyl group, or a substituted or unsubstituted (heterocycloalkyl)alkyl group.
- Exemplary substitutions for Ri, R 2 , and R 3 are described in more detail below.
- Ri is independently chosen form a hydrogen; an unsubstituted phenyl group; a mono- or di(halo)phenyl group such as 2-, 3-, A-, or 5- fluorophenyl, 3,4- or 5,6- or 5,7-or 5,8- difluorophenyl; a mono- or di-(alkyl)phenyl group, such as a 2-, 3-, A-, or 5-methylphenyl group, 2,6- or 3,4- or 5,6- or 5,7-or 5,8- dimethylphenyl; or a mono(alkoxy)phenyl group, such as a 2-, 3-, 4-, or 5-methoxyphenyl, 2-, 3-, A-, or 5-ethoxyphenyl, 2-, 3-, A-, or 5-propoxyphenyl; R 2 is independently selected from a alkyl group, such as a methyl group, an ethyl group, or a propylene group; R 3 is independently selected from a
- R 4 is a substituted or unsubstituted heterocycloalkyl group containing a nitrogen atom, wherein the heterocycloalkyl group is linked to the sulfur atom by the nitrogen atom of the heterocycloalkyl group, a substituted or unsubstituted heterocyclic group;
- R 3 is independently selected from a an alkyl group such as a substituted or unsubstituted, saturated linear or branched hydrocarbon group or chain (e.g., Ci to C 8 ) including, e.g., methyl, ethyl, isopropyl, tert-butyl, heptyl, n-octyl, dodecyl, octadecyl, amyl, 2-ethylhexyl, an ether group, a substituted or unsubstituted hydrocarbon cyclic ring group, or a substituted or unsubstituted heterocyclic ring.
- R 3 is independently
- » is independently select from l,4-Dioxa-8-aza- spiro[4.5]decane group or a 2,3-Dihydro-lH-indole group; and R 3 is independently selected from a alkyl group, such as a butyl group, a propylene group, an isopentyl group, and a methoxy-propane; a cycloalkyl group, such as a cyclopentane, and a cylcohexane; a (cycloalkyl)alkyl group, such as a ethyl-cyclohexene; a (heteroaromatic)alkyl group, such as a 3-methyl-furan, and a 2-, 3-, A-, or 5-methyl-pyridine; or a (heterocycloalkyl)alkyl group, such as a 3-methyl-tetrahydro-furan group.
- R 3 is independently selected from a alkyl
- analogs and derivatives of the subject compounds described above refers to a molecule which is structurally similar or has the same function or activity as the subject phenylglycine containing compounds or sulfonamide containing compounds of the invention.
- Such analogs and derivatives of the subject compounds can be screened for efficiency in binding to and modulating the activity of a mutant CFTR, such as ⁇ F508-CFTR, G55 ID-CFTR, G1349D- CFTR, or D1152H-CFTR.
- in silico modeling can be used to screen 3-dimensional libraries of analog or derivative compounds for activity in binding to and modulating the activity of a mutant CFTR, such as ⁇ F508-CFTR, G55 ID-CFTR, G1349D-CFTR, or Dl 152H-CFTR.
- a mutant CFTR such as ⁇ F508-CFTR, G55 ID-CFTR, G1349D-CFTR, or Dl 152H-CFTR.
- An exemplary in silico modeling program suitable for use with the subject method is the PREDICTTM 3D Modeling Technology (Predix Pharmaceuticals, Woburn MA), described in greater detail in Becker et al., PNAS 101(31):11304-11309 (2004).
- Pharmaceutical preparations containing compounds of the invention are described in greater detail in Becker et al., PNAS 101(31):11304-11309 (2004).
- compositions for therapeutic administration by a variety of routes. More particularly, the compounds of the present invention can be formulated into pharmaceutical compositions by combination with appropriate, pharmaceutically acceptable carriers, diluents, excipients and/or adjuvants, and may be formulated into preparations in solid, semi-solid, liquid or gaseous forms, such as tablets, capsules, powders, granules, ointments, solutions, suppositories, injections, inhalants and aerosols.
- the formulations are free of detectable DMSO (dimethyl sulfoxide), which is not a pharmaceutically acceptable carrier, diluent, excipient, or adjuvant, particularly in the context of routes of administration other than transdermal routes.
- the compounds are preferably formulated either without detectable DMSO or with a carrier in addition to DMSO.
- the formulations may be designed for administration to subjects or patients in need thereof via a number of different routes, including oral, buccal, rectal, parenteral, intraperitoneal, intradermal, intratracheal, etc., administration.
- compositions usable with the invention such as vehicles, adjuvants, carriers or diluents, are readily available to the public.
- pharmaceutically acceptable auxiliary substances such as pH adjusting and buffering agents, tonicity adjusting agents, stabilizers, wetting agents and the like, are readily available to the public.
- Suitable excipient vehicles are, for example, water, saline, dextrose, glycerol, ethanol, or the like, and combinations thereof.
- the vehicle may contain minor amounts of auxiliary substances such as wetting or emulsifying agents or pH buffering agents.
- auxiliary substances such as wetting or emulsifying agents or pH buffering agents.
- Actual methods of preparing such dosage forms are known, or will be apparent, to those skilled in the art. See, e.g., Remington's Pharmaceutical Sciences, Mack Publishing Company, Easton, Pennsylvania, 17th edition, 1985; Remington: The Science and Practice of Pharmacy, A.R. Gennaro, (2000) Lippincott, Williams & Wilkins.
- the composition or formulation to be administered will, in any event, contain a quantity of the agent adequate to achieve the desired state in the subject being treated. Dosage forms of compounds of the invention
- the subject compounds of the invention may be administered in the form of their pharmaceutically acceptable salts, or they may also be used alone or in appropriate association, as well as in combination, with other pharmaceutically active compounds.
- the following methods and excipients are merely exemplary and are in no way limiting.
- the agent can be administered to a host using any available conventional methods and routes suitable for delivery of conventional drugs, including systemic or localized routes.
- routes of administration contemplated by the invention include, but are not necessarily limited to, enteral, parenteral, or inhalational routes, such as intrapulmonary or intranasal delivery.
- routes of administration include intranasal, intrapulmonary intramuscular, intratracheal, intratumoral, subcutaneous, intradermal, topical application, intravenous, rectal, nasal, oral and other parenteral routes of administration. Routes of administration may be combined, if desired, or adjusted depending upon the agent and/or the desired effect.
- the composition can be administered in a single dose or in multiple doses.
- the compounds of the invention are administered in aerosol formulation via intrapulmonary inhalation.
- the compounds of the present invention can be formulated into pressurized acceptable propellants such as dichlorodifluoromethane, propane, nitrogen and the like.
- Mechanical devices designed for intrapulmonary delivery of therapeutic products include but are not limited to nebulizers, metered dose inhalers, and powder inhalers, all of which are familiar to those of skill in the art.
- nebulizers include but are not limited to nebulizers, metered dose inhalers, and powder inhalers, all of which are familiar to those of skill in the art.
- Specific examples of commercially available devices suitable for the practice of this invention are the Ultravent nebulizer, manufactured by Mallinckrodt, Inc., St.
- Formulations for use with a metered dose inhaler device may generally comprise a finely divided powder.
- This powder may be produced by lyophilizing and then milling a liquid conjugate formulation and may also contain a stabilizer such as human serum albumin (HSA). Typically, more than 0.5% (w/w) HSA is added.
- HSA human serum albumin
- one or more sugars or sugar alcohols may be added to the preparation if necessary. Examples include lactose maltose, mannitol, sorbitol, sorbitose, trehalose, xylitol, and xylose.
- the amount added to the formulation can range from about 0.01 to 200% (w/w), preferably from approximately 1 to 50%, of the conjugate present. Such formulations may then lyophilized and milled to the desired particle size.
- the properly sized particles may then suspended in a propellant with the aid of a surfactant.
- the propellant may be any conventional material employed for this purpose, such as a chlorofluorocarbon, a hydrochlorofluorocarbon, a hydrofluorocarbon, or a hydrocarbon, including trichlorofluoromethane, dichlorodifluoromethane, dichlorotetrafluoroethanol, and 1,1,1,2-tetrafluoroethane, or combinations thereof.
- Suitable surfactants may include sorbitan trioleate and soya lecithin. Oleic acid may also be useful as a surfactant. This mixture may then loaded into the delivery device.
- An example of a commercially available metered dose inhaler suitable. for use in the present invention is the Ventolin metered dose inhaler, manufactured by Glaxo Inc., Research Triangle Park, N.C.
- Formulations for powder inhalers may comprise a finely divided dry powder containing conjugate and may also include a bulking agent, such as lactose, sorbitol, sucrose, or mannitol in amounts which facilitate dispersal of the powder from the device, e.g., 50% to 90% by weight of the formulation.
- the particles of the powder may have aerodynamic properties in the lung corresponding to particles with a density of about 1 g/cm.sup.2 having a median diameter less than 10 micrometers, preferably between 0.5 and 5 micrometers, most preferably of between 1.5 and 3.5 micrometers.
- a powder inhaler suitable for use in accordance with the teachings herein is the Spinhaler powder inhaler, manufactured by Fisons Corp., Bedford, Mass.
- the powders for these devices may be generated and/or delivered by methods disclosed in U.S. Pat. No. 5,997,848, U.S. 5,993,783, U.S. 5,985,248, U.S. 5,976574, U.S. 5,922,354, U.S. 5,785,049 and U.S. 5,654,007.
- the subject compounds can be used alone or in combination with appropriate additives to make tablets, powders, granules or capsules, for example, with conventional additives, such as lactose, mannitol, corn starch or potato starch; with binders, such as crystalline cellulose, cellulose derivatives, acacia, corn starch or gelatins; with disintegrators, such as corn starch, potato starch or sodium carboxymethylcellulose; with lubricants, such as talc or magnesium stearate; and if desired, with diluents, buffering agents, moistening agents, preservatives and flavoring agents.
- conventional additives such as lactose, mannitol, corn starch or potato starch
- binders such as crystalline cellulose, cellulose derivatives, acacia, corn starch or gelatins
- disintegrators such as corn starch, potato starch or sodium carboxymethylcellulose
- lubricants such as talc or magnesium stearate
- Parenteral routes of administration other than inhalation administration include, but are not necessarily limited to, topical, transdermal, subcutaneous, intramuscular, intraorbital, intracapsular, intraspinal, intrasternal, and intravenous routes, i.e., any route of administration other than through the alimentary canal.
- Parenteral administration can be carried to effect systemic or local delivery of the agent. Where systemic delivery is desired, administration typically involves invasive or systemically absorbed topical or mucosal administration of pharmaceutical preparations.
- Methods of administration of the agent through the skin or mucosa include, but are not necessarily limited to, topical application of a suitable pharmaceutical preparation, transdermal transmission, injection and epidermal administration.
- a suitable pharmaceutical preparation for transdermal transmission, absorption promoters or iontophoresis are suitable methods.
- Iontophoretic transmission may be accomplished using commercially available "patches" which deliver their product continuously via electric pulses through unbroken skin for periods of several days or more.
- the subject compounds of the invention can be formulated into preparations for injection by dissolving, suspending or emulsifying them in an aqueous or nonaqueous solvent, such as vegetable or other similar oils, synthetic aliphatic acid glycerides, esters of higher aliphatic acids or propylene glycol; and if desired, with conventional additives such as solubilizers, isotonic agents, suspending agents, emulsifying agents, stabilizers and preservatives.
- the agent can also be delivered to the subject by enteral administration. Enteral routes of administration include, but are not necessarily limited to, oral and rectal (e.g., using a suppository) delivery.
- the subject compounds can be made into suppositories by mixing with a variety of bases such as emulsifying bases or water-soluble bases.
- bases such as emulsifying bases or water-soluble bases.
- the compounds of the present invention can be administered rectally via a suppository.
- the suppository can include vehicles such as cocoa butter, carbowaxes and polyethylene glycols, which melt at body temperature, yet are solidified at room temperature. Dosages of the compounds of the invention
- the subject compounds may be administered in dosages of, for example, 0.1 ⁇ g to 10 mg/kg body weight per day.
- the range is broad, since in general the efficacy of a therapeutic effect for different mammals varies widely with doses typically being 20, 30 or even 40 times smaller (per unit body weight) in man than in the rat.
- the mode of administration can have a large effect on dosage.
- oral dosages may be about ten times the injection dose. Higher doses may be used for localized routes of delivery.
- a typical dosage may be a solution suitable for intravenous administration; a tablet taken from two to six times daily, or one time-release capsule or tablet taken once a day and containing a proportionally higher content of active ingredient, etc.
- the time-release effect may be obtained by capsule materials that dissolve at different pH values, by capsules that release slowly by osmotic pressure, or by any other known means of controlled release.
- dose levels can vary as a function of the specific compound, the severity of the symptoms and the susceptibility of the subject to side effects. Preferred dosages for a given compound are readily determinable by those of skill in the art by a variety of means.
- a suitable dosage range is one which provides up to about 1 ⁇ g to about 1,000 ⁇ g or about 10,000 ⁇ g of subject composition to reduce a symptom in a subject animal.
- Unit dosage forms for oral or rectal administration such as syrups, elixirs, and suspensions may be provided wherein each dosage unit, for example, teaspoonful, tablespoonful, tablet or suppository, contains a predetermined amount of the composition containing one or more compounds of the invention.
- unit dosage forms for injection or intravenous administration may comprise the compound (s) in a composition as a solution in sterile water, normal saline or another pharmaceutically acceptable carrier. Combination therapy using the compounds of the invention
- the subject compounds may be formulated with or otherwise administered in combination with other pharmaceutically active agents, including other CFTR-activating agents.
- the subject compounds may be used to provide an increase in the effectiveness of another chemical, such as a pharmaceutical (e.g., other CFTR-activating agents, or agents that affect cellular misprocessing of mutant-CFTR), or a decrease in the amount of another chemical, such as a pharmaceutical (e.g., other CFTR-activating agents), that is necessary to produce the desired biological effect.
- a pharmaceutical e.g., other CFTR-activating agents, or agents that affect cellular misprocessing of mutant-CFTR
- a pharmaceutical e.g., other CFTR-activating agents
- CFTR activating agents include, but are not limited to, enhancers of intracellular cAMP levels, such as for example, but not limited to, forskolin, rolipram, 8- bromo-cAMP, theophylline, papaverine, cAMP and salts, analogs, or derivatives thereof.
- enhancers of intracellular cAMP levels such as for example, but not limited to, forskolin, rolipram, 8- bromo-cAMP, theophylline, papaverine, cAMP and salts, analogs, or derivatives thereof.
- Other examples include beta agonists, tobramycin (TOBI ® , Chiron Inc., Emeryville, Calif.) and curcumin (Egan et al., (2004) Science 304:600-603).
- the compounds described above may also be combined with other therapies for CF, including oral corticosteroids, ibuprofen, ribovarin or antibiotics such as dicloxacillin, cephalosporin, cephalexin, erythromycin, amoxicillin-clavulanate, ampicillin, tetracycline, trimethoprim-sulfamethoxazole, chloramphenicol ciprofloxacin, tobramycin, gentamicin, cephalosporins, monobactams and the like.
- antibiotics such as dicloxacillin, cephalosporin, cephalexin, erythromycin, amoxicillin-clavulanate, ampicillin, tetracycline, trimethoprim-sulfamethoxazole, chloramphenicol ciprofloxacin, tobramycin, gentamicin, cephalosporins, monobactams and the like.
- the compounds described herein for use in combination therapy with the compounds of the present invention may be administered by the same route of administration (e.g. intrapulmonary, oral, enteral, etc.) that the compounds are administered.
- the compounds for use in combination therapy with the compounds of the present invention may be administered by a different route of administration that the compounds are administered.
- Kits with unit doses of the subject compounds are provided.
- kits in addition to the containers containing the unit doses will be an informational package insert describing the use and attendant benefits of the drugs in treating pathological condition of interest.
- Preferred compounds and unit doses are those described herein above.
- the invention provides methods for increasing ion permeability of a cell that produces mutant-CFTR protein, with cells having a gating defective mutant-CFTR being of interest, with cells having a ⁇ F508-CFTR, G55 ID-CFTR, G1349D-CFTR, or Dl 152H- CFTR being of particular interest.
- the method involves contacting the cell with a compound in an amount effective to activate the mutant-CFTR protein and increase ion permeability of the cell.
- a compound of the invention is used in the method in combination with a second mutant-CFTR activator or potentiator.
- the cell mutant-CFTR protein is present on the plasma membrane of the cell.
- Methods of detecting mutant-CFTR protein presence on the plasma membrane are well known in the art and can include but are not limited to, for example, labeling a molecule that binds to CFTR protein with a fluorescent, chemical or biological tag.
- molecules that bind to CFTR protein include, without limitation, antibodies (monoclonal and polyclonal), FAB fragments, humanized antibodies and chimeric antibodies.
- an antibody that binds to CFTR protein see, e.g. U.S. Patent No. 6,201,107.
- the cell has increased permeability to chloride ions, and the contacting of the cell with a compound of the invention, particularly when provided in combination with a mutant-CFTR activator or potentiator, increases the rate of chloride ion transport across the plasma membrane of the cell. Contacting the cell with a compound of the invention usually increases the activity of mutant-CFTR protein to increase ion transport.
- the ion transport activity of mutant-CFTR, or the permeability of a cell to ions is increased by up to about 10%, by up to about 20%, by up to about 50%, by up to about 100%, by up to about 150%, by up to about 200%, by up to about 300%, by up to about 400%, by up to about 500%, by up to about 800%, or up to about 1000% or more.
- contacting of the cell with a compound of the invention causes detectable activity of mutant-CFTR or permeability of a cell to ions.
- mutant-CFTR and/or ion permeability may be measured using any convenient methods that may use molecular markers, e.g., a halide sensitive GFP or another molecular marker (e.g., Galietta et al., (2001) FEBS Lett. 499, 220-224), patch clamp assays, and short circuit assays.
- molecular markers e.g., a halide sensitive GFP or another molecular marker (e.g., Galietta et al., (2001) FEBS Lett. 499, 220-224), patch clamp assays, and short circuit assays.
- Suitable cells include those cells that have an endogenous or introduced mutant- CFTR gene.
- Suitable cells include mammalian cell systems (e.g., COS, CHO, BHK, 293, 3T3 cells etc.) harboring constructs that have an expression cassette for expression of mutant-CFTR.
- the cell used in the subject methods may be a cell present in vivo, ex vivo, or in vitro.
- expression cassette is meant to denote a genetic sequence, e.g. DNA or RNA, that codes for mutant-CFTR protein, e.g., ⁇ F508-CFTR.
- the invention also provides methods of treating a subject having a condition associated with mutant-CFTR, e.g., cystic fibrosis.
- the method involves administering to the subject a compound of the invention in an amount effective to activate a mutant-CFTR protein to increase ion transport and thereby treat the condition.
- a compound of the invention is administered in combination with a second mutant-CFTR activator or potentiator, e.g., a compound that enhances intracellular cAMP, e.g., forskolin.
- mutant-CFTR-mediated condition e.g., any condition, disorder or disease, or symptom of such condition, disorder, or disease, that results from the presence and/or activity of mutant-CFTR as compared to wild-type CFTR, e.g., activity of mutant-CFTR in ion transport.
- mutant-CFTR activity e.g., activation of mutant-CFTR chloride transport.
- Cystic fibrosis a hereditary condition associated with a mutant-CFTR, e.g., ⁇ F508-CFTR G55 ID-CFTR, G1349D-CFTR, or Dl 152H-CFTR, is an example of a condition that is treatable using the compounds of the invention.
- Use of the compounds of the invention in combination with a second mutant CFTR activator or potentiator is of particular interest.
- Cystic fibrosis is predominantly a disorder of infants, children and young adults, in which there is widespread dysfunction of the exocrine glands, characterized by signs of chronic pulmonary disease (due to excess mucus production in the respiratory tract), pancreatic deficiency, abnormally high levels of electrolytes in the sweat and occasionally by biliary cirrhosis. Also associated with the disorder is an ineffective immunologic defense against bacteria in the lungs.
- pancreas shows obstruction of the pancreatic ducts by amorphous eosinophilic concretions, with consequent deficiency of pancreatic enzymes, resulting in steatorrhoea and azotorrhoea and intestinal malabsorption.
- pancreatic enzymes resulting in steatorrhoea and azotorrhoea and intestinal malabsorption.
- the degree of involvement of organs and glandular systems may vary greatly, with consequent variations in the clinical picture.
- Nearly all exocrine glands are affected in cystic fibroses in varying distribution and degree of severity.
- Involved glands are of three types: those that become obstructed by viscid or solid eosinophilic material in the lumen (pancreas, intestinal glands, intrahepatic bile ducts, gallbladder, submaxillary glands); those that are histologically abnormal and produce an excess of secretions (tracheobronchial and Brunner's glands); and those that are histologically normal but secrete excessive sodium and chloride (sweat, parotid, and small salivary glands).
- Duodenal secretions are viscid and contain an abnormal mucopolysaccharide.
- Infertility occurs in 98% of adult men secondary to maldevelopment of the vas deferens or to other forms of obstructive azoospermia.
- fertility is decreased secondary to viscid cervical secretions, but many women with CF have carried pregnancies to term. However, the incidence of maternal complications increases.
- Pancreatic insufficiency is clinically apparent in 85 to 90% of CF patients, usually presents early in life, and may be progressive. Manifestations include the frequent passage of bulky, foul-smelling, oily stools; abdominal protuberance; and poor growth pattern with decreased subcutaneous tissue and muscle mass despite a normal or voracious appetite. Rectal prolapse occurs in 20% of untreated infants and toddlers. Clinical manifestations may be related to deficiency of fat-soluble vitamins.
- Insulin-dependent diabetes develops in 10% of adult patients having CF, and multilobular biliary cirrhosis with varices and portal hypertension develops in 4 to 5% of adolescents and adults.
- Chronic and/or recurrent abdominal pain may be related to intussusception, peptic ulcer disease, periappendiceal abscess, pancreatitis, gastroesophageal reflux, esophagitis, gallbladder disease, or episodes of partial intestinal obstruction secondary to abnormally viscid fecal contents.
- Inflammatory complications may include vasculitis and arthritis.
- Any of above symptoms of CF may be treated using the compounds of the invention, with use of such compounds in combination with a second mutant-CFTR activator or potentiator being of particular interest.
- the above methods may be used to treat CF and its symptoms in humans or in animals.
- CF animal models for CF are known in the art.
- Engelhardt et al. J. Clin. Invest. 90: 2598-2607, 1992
- Engelhardt et al. developed an animal model of the human airway, using bronchial xenografts engrafted on rat tracheas and implanted into nude mice.
- transgenic models of cystic fibrosis have been produced (e.g., Clarke et al., Science 257: 1125-1128, 1992; Dorin et al., Nature 359: 211-215, 1992).
- Clarke et al. Science 257: 1125-1128, 1992
- Dorin et al. Nature 359: 211-215, 1992.
- the alteration of a wild type CFTR gene in an animal to make it into a mutant-CFTR gene is possible for a wide variety of animals.
- Animals suitable for treatment using the subject methods include any animal with a mutant-CFTR related condition, particularly a mammal, e.g., non-human primates (e.g., monkey, chimpanzee, gorilla, and the like), rodents (e.g., rats, mice, gerbils, hamsters, ferrets, and the like), lagomorphs, swine (e.g., pig, miniature pig), equine, canine, feline, and the like. Large animals are of particular interest.
- Transgenic mammals may also be used, e.g. mammals that have a chimeric gene sequence. Methods of making transgenic animals are well known in the art, see, for example, U.S. Patent No. 5,614,396. For an example of a transgenic mouse with a CFTR defect, see e.g. WO 94/04669.
- Such animals may be tested in order to assay the activity and efficacy of the subject compounds.
- Improvement in lung function can be assessed by, for example, monitoring prior to and during therapy the subject's forced vital capacity (FVC), carbon monoxide diffusing capacity (DLco), and/or room air pO 2 >55 mmHg at rest. Significant improvements in one or more of these parameters are indicative of efficacy.
- FVC forced vital capacity
- DLco carbon monoxide diffusing capacity
- ROP 2 room air pO 2 >55 mmHg at rest.
- Significant improvements in one or more of these parameters are indicative of efficacy.
- It is well within the skill of the ordinary healthcare worker e.g., clinician
- Subjects suitable for treatment are well within the skill of the ordinary healthcare worker (e.g., clinician) provide adjust dosage
- Subjects suitable for treatment with a method of the present invention include individuals having mutant-CFTR protein-mediated condition disorder or disease, or symptom of such condition, disorder, or disease that results from or is correlated to the presence of a mutant-CFTR, usually two alleles of the mutant CFTR.
- subjects suitable for treatment with a method of the present invention include individuals with Cystic Fibrosis (CF). Of particular interest in many embodiments is the treatment of humans with CF.
- Symptoms of mutant-CFTR protein-mediated conditions include meconium ileus, liver disease including biliary tract obstruction and stenosis, pancreatic insufficiency, pulmonary disease including chronic Pseudomonas aeruginosa infections and other infections of the lung, infertility associated with abnormal vas deferens development or abnormal cervical mucus, and carcinoma including adenocarcinoma.
- the compounds of the present invention affect the ion transport capability of the mutant-CFTR by increasing the reduced level of ion transport mediated by a mutant-CFTR, such as the ⁇ F508-CFTR, G55 ID-CFTR, G1349D-CFTR, or Dl 152H-CFTR.
- a mutant-CFTR such as the ⁇ F508-CFTR, G55 ID-CFTR, G1349D-CFTR, or Dl 152H-CFTR.
- the compounds of the present invention have particular clinical utility in treating a subset of CF patients that have mutations in the CFTR gene that results a mutant-CFTR that is expressed in the plasma membrane and has reduced chloride conductance capability or has abnormal regulation of conductance (i.e., the mutant-CFTR is gating defective).
- the compounds of the present invention have clinical utility in treating CF patients having a gating-defective mutant-CFTR, such as ⁇ F508-CFTR, G55 ID-CFTR, G1349D-CFTR, or Dl 152H-CFTR.
- the compounds of the present invention also have clinical utility in treating CF patients when used in conjunction with compounds that correct cellular misprocessing of a mutant-CFTR, such as ⁇ F508-CFTR.
- CFTR mutations associated with CF are well known in the art. These mutations can be classified in five general categories with respect to the CFTR protein. These classes of CFTR dysfunction include limitations in CFTR production (e.g., transcription and/or translation) (Class I), aberrant folding and/or trafficking (Class II), abnormal regulation of conduction (Class III), decreases in chloride conduction (Class IV), and reductions in synthesis (Class V). Due to the lack of functional CFTR, Class I, II, and III mutations are typically associated with a more severe phenotype in CF (i.e. pancreatic insufficiency) than the Class IV or V mutations, which may have very low levels of functional CFTR expression.
- Class I, II, and III mutations are typically associated with a more severe phenotype in CF (i.e. pancreatic insufficiency) than the Class IV or V mutations, which may have very low levels of functional CFTR expression.
- a subject suitable for treatment with a method of the present invention may be homozygous for a specific mutant-CFTR, i.e. homozygous subjects with two copies of a specific mutant-CFTR, e.g., ⁇ F508-CFTR.
- subjects suitable for treatment with a method of the present invention may also be compound heterozygous for two different CFTR mutants, i.e., wherein the genome of the subjects includes two different mutant forms of CFTR, e.g., a subject with one copy of ⁇ F508-CFTR and a copy of different mutant form of CFTR.
- the mutant-CFTR polypeptide is ⁇ F508- CFTR. In other embodiments of the invention, the mutant-CFTR polypeptide is G55 ID- CFTR. In yet other embodiments of the invention, the mutant-CFTR polypeptide is G1349D-CFTR. In still other embodiments of the invention, the mutant-CFTR polypeptide is D152H-CFTR. The invention, however, should not be construed to be limited solely to the treatment of CF patients having this mutant form of CFTR.
- the invention should be construed to include the treatment of CF patients having other mutant forms of CFTR with similar characteristics, that result in expression of the mutant-CFTR in the plasma membrane and has reduced chloride conductance capability or has abnormal regulation of conductance. Rational Therapy
- the invention also provides rational therapy-based methods for treating a subject having a condition associated with a mutant-CFTR, e.g., cystic fibrosis.
- the method involves determining the underlying CFTR mutation of the patient and selecting a treatment regimen for administering to the patient based on the CFTR mutation, where the compound selected for administration is one having activity that provides for improved function of the particular CFTR mutant.
- the compound selected for administration is one having activity that provides for improved function of the particular CFTR mutant.
- the clinician can more readily prescribe a successful therapy, based on selection of a compound in light of the CFTR mutation in the patient. Therefore, the selected treatment regimen is more effective and rationally based.
- such rational therapy can significantly reduce therapy- associated toxicity.
- the process of determining the CFTR mutation of a patient includes any suitable method, of which many are known in the art. Suitable methods include determining the DNA sequence, or by detecting an RNA transcript corresponding to such DNA sequence, of a polymorphic gene. Various other detection techniques suitable for use in the present methods will be apparent to those conversant with methods of detecting, identifying, and/or distinguishing CFTR mutations.
- Such detection techniques include but are not limited to direct sequencing, use of "molecular beacons” (oligonucleotide probes that fluoresce upon hybridization, useful in real-time fluorescence PCR; see e.g., Marras et al., Genet Anal 14:151 (1999)); electrochemical detection (reduction or oxidation of DNA bases or sugars; see U.S. Pat. No.
- any suitable detection technique as is known in the art may be utilized in the present methods to genotype the subject.
- suitable biological specimens to use for determining the CFTR mutation of the subject are those which comprise cells and DNA and include, but are not limited to blood or blood components, dried blood spots, urine, buccal swabs and saliva.
- the underlying CFTR mutation of the patient is determined, it is used to select a compound that will be most effective for the underlying CFTR mutation.
- the patient will be administered will be administered a composition containing a sulfonamide containing compound in either a mono-drug therapy or in combination with another compound as described above.
- the patient will be treated with phenylglycine-containing compound in either a mono-drug therapy or in combination with another compound as described above.
- the subject has a gating defective CFTR mutation, such as a class III mutation (e.g., G55 ID-CFTR, G1349D-CFTR, or Dl 152-CFTR)
- a gating defective CFTR mutation such as a class III mutation (e.g., G55 ID-CFTR, G1349D-CFTR, or Dl 152-CFTR)
- the subject is treated with a phenylglycine containing compound in either a mono-drug therapy or in combination with another compound as described above.
- T ,- • ' y s o s / .1 3 i! -s s compounds are screened in order to select a compound having enhanced activity for the particular CFTR mutant of the patient compared to other compounds of the same genus or class.
- An exemplary in silico modeling program suitable for use with the subject method is the PREDICTTM 3D Modeling Technology (Predix Pharmaceuticals, Woburn MA), described in greater detail in Becker et al., PNAS 101(31):11304-11309 (2004).
- cells were cultured on plastic in Coon's modified F12 medium supplemented with 10% fetal bovine serum, 2 mM L-glutamine, 100 U/ml penicillin, and 100 ⁇ g/ml streptomycin, and plated on black 96-well microplates (Corning-Costar 3904) at 30,000 cells/well.
- cells were cultured on Snapwell permeable supports (Corning-Costar) at 500,000 cells/insert.
- Human nasal epithelium cells from CF patients were cultured on Snapwell inserts and allowed to differentiate in a hormone-supplemented medium (Galietta et al., Am. J. Physiol., 275:19723-19728 (1998)).
- Screening was carried out using a Beckman integrated system containing a 3-meter robotic arm, CO 2 incubator containing microplate carousel, plate-washer, liquid handling workstation, bar code reader, delidding station, plate sealer, and two FluoStar fluorescence plate readers (Galaxy, BMG Lab Technologies), each equipped with dual syringe pumps and HQ500/20X (500 ⁇ 10 nm) excitation and HQ535/30M (535 ⁇ 15 nm) emission filters (Chroma).
- Software was written in VBA (Visual Basic for Applications) to compute baseline-subtracted fluorescence slopes (giving halide influx rates).
- I " influx rates were computed from initial fluorescence versus time-curve slopes (determined by 3 rd order polynomial regression) after normalization for total fluorescence (background subtracted initial fluorescence). All compound plates contained negative control (DMSO vehicle alone) and positive controls (genistein, 5 ⁇ M and 50 ⁇ M). Assay analysis indicated a Z'-factor of >0.7 (Zhang et al., J. Biomol. Screen 4:67-73 (1999)).
- the extracellular (bath) solution contained (in mM): 150 NaCl, 1 CaCl 2 , 1 MgCl 2 , 10 glucose, 10 mannitol, and 10 TES (pH 7.4).
- the pipette solution contained (in mM): 120 CsCl, 1 MgCl 2 , 10 TEA-C1, 0.5 EGTA, 1 Mg-ATP, and 10 Hepes (pH 7.3).
- Membrane conductances were monitored by alternating the membrane potential between +80 and -100 mV. Current- voltage relationships were generated by applying voltage pulses between -100 and +100 mV in 20 mV steps.
- the basolateral solution contained (in mM): 130 NaCl, 2.7 KC1, 1.5 KH 2 PO 4 , 1 CaCl 2 , 0.5 MgCl 2 , 10 glucose, 10 Na-Hepes (pH 7.3).
- the basolateral membrane was permeabilized with 250 ⁇ g/ml amphotericin B.
- the hemichambers were connected to a DVC-1000 voltage clamp (World Precision Instruments) via Ag/AgCl electrodes and 1 M KC1 agar bridges for recording short-circuit current.
- cAMP activity was measured using the BIOTRAK enzymatic immunoassay (Amersham) of FRT cell lysates after incubation with the compounds for 10 minutes in the presence of 0.5 ⁇ M forskolin. Pharmacokinetics
- potentiators were dissolved in a liposomal formulation containing 5 mg potentiator in 21.3 mg hydrogenated soy phosphatidylcholine, 5.2 mg cholesterol, 8.4 mg distearoylphosphatidylglycerol, and 90 mg sucrose in 5 ml PBS.
- a bolus of potentiator-containing solution (5 mg/kg) was administered intravenously in rats over 1 min (male Sprague-Dawley rats, 360-420 grams) by a jugular vein catheter.
- Arterial blood samples ( ⁇ 1 ml) were obtained at predetermined times for LCMS analysis. Liquid Chromatography / Mass Spectrometry (LCMS)
- Reversed-phase HPLC separations were carried out using a Supelco C18 column (2.1 x 100 mm, 3 ⁇ m particle size) connected to a solvent delivery system (Waters model 2690, Milford, MA).
- the solvent system consisted of a linear gradient from 20% CH 3 CN/10 mM KH 2 PO 4 ,pH 3 to 95% CH 3 CN/10mM KH 2 PO 4 , pH 3 over 10 min, followed by 6 min at 95% CH 3 CN/20 mM NH 4 OAc (0.2 ml/min flow rate).
- Compounds P-1 and S-3 were detected at 256 nm, after establishing a linear standard calibration curve in the range of 20-5000 nM. The detection limit was 10 nM and recovery was >90%.
- Mass spectra were acquired on a mass spectrometer (Alliance HT 2790 + ZQ) using negative ion detection, scanning from 200 to 800 Da (Sonawane et al., J. Pharm. Sci. 94:134-143 (2004)).
- Stability in Hepatic Microsomes [00175] Compounds P-1 and S-3 (10 ⁇ M each) were incubated separately with a phosphate buffered (100 mM) solution of rat liver microsomes (2 mg protein/ml, Sigma) containing NADPH (0 or 1 mM) for 60 min at 37 °C. After 60 min the mixture was chilled on ice, and 0.5 ml of ice-cold acetonitrile was added to precipitate the proteins for LCMS analysis as described above.
- the high-throughput screen was designed to identify compounds that activated ⁇ F508-CFTR when expressed at the cell plasma membrane.
- FRT epithelial cells co- expressing ⁇ F508-CFTR and a high sensitivity yellow fluorescent protein-based halide indicator were incubated at 27 °C for 24 h to permit ⁇ F508-CFTR plasma membrane targeting (Fig. 1, panel A).
- forskolin (20 ⁇ M) and test compounds (2.5 ⁇ M) were added to individual wells of 96-well plates.
- the I " influx assay was carried out -15 min later by measurement of the time course of decreasing YFP fluorescence after creation of an inwardly-directed I " gradient.
- a high concentration of forskolin was used to identify ⁇ F508- CFTR potentiators that may interact directly with ⁇ F508-CFTR rather than alter cAMP concentration. Since activation of CFTR requires cAMP stimulation, forskolin, an enhancer of cAMP, was added to the in vitro models in order to mimic the cellular cAMP stimulation. Each plate also contained positive control wells in which a dose-response was done for genistein, a known (though low potency) ⁇ F508-CFTR potentiator.
- Fig. 2, panel A depicts representative structures of the two classes of compounds identified by the subject screen.
- the strong potentiators were subjected to secondary analysis to select a subset for further analysis. More than 300 structural analogs were evaluated to establish structure- activity relationships and to identify compounds with improved potency. Dose-response studies were done to determine K a and V max , with representative data shown in Fig. 3, panel A (phenylglycine containing compounds) and panel B (sulfonamide containing compounds). Dose response data from the fluorescence assay for the most active compounds of each class is shown in Fig. 3, panel C, with data for comparison shown for genistein and the tetrahydobenzothiophene ⁇ F508 act -02.
- the R2 phenyl group appeared to be important for activity as its replacement by indol-3 -methyl reduced activity.
- All potent compounds had as R3 a methyl, as its replacement by hydrogen (PG-06) or furfuryl-2 -methyl reduced activity.
- Most active compounds had as R4 an indolyl-3-acetyl, as substitution by thiophene-2-acetyl or diphenyl acetyl resulted in loss of activity.
- greatest ⁇ F508-CFTR activating potency was produced by hydrophobic Rl, R2, and R3, with R4 as indolyl-2 (or 3)-acetyl.
- Short-circuit current analysis was done on each of these compounds to confirm bona fide activation of ⁇ F508-CFTR CI " currents. Experiments were done after basolateral membrane permeabilization and in the presence of a transepithelial CI " gradient, so that short-circuit current represents apical membrane CI " current. Representative data are shown in Fig. 4, panel A. CFTR-mediated chloride currents measured in FRT cells expressing ⁇ F508-CFTR. Cells were plated on a permeable support to generate a polarized epithelium, cultured for 5-7 days, and then incubated at 27 °C for 24 hours.
- Transepithelial chloride current was measured in a modified Ussing chamber in the presence of a chloride gradient.
- Cells were maximally stimulated with forskolin (20 ⁇ M) and then with the indicated concentrations of the phenylglycine containing compound P-1 and the sulfonamide containing compound S-1.
- Specific activation of CFTR is demonstrated by the block of current caused by the thiazolidinone CFTR inhibitor CFTR inh -172.
- the results show that the phenylglycine containing compound P-1 and the sulfonamide containing compound S-1 gave ⁇ F508-CFTR currents with potencies better than lOOnM, and maximal currents comparable to or greater than that produced by 50 ⁇ M genistein (see Fig. 3, panel B).
- Fig. 5 depicts the results with phenylglycine containing compounds and sulfonamide containing compounds showing potentiation of the response of ⁇ F508-CFTR to forskolin.
- Panel A shows the representative traces obtained from Ussing chamber experiments show the effect of forskolin at increasing concentrations in the presence and the absence of the phenyglyicine containing compound P-1 (100 nM).
- Figure 5 panel A shows that forskolin alone produces a small increase in current, with little effect at 2 ⁇ M and a larger effect at 20 ⁇ M (top).
- Panel B shows a summary of similar experiments for the phenylglycine containing compound P-1 and the sulfonamide containing compound S-1 showing significant increase in current induced by low concentrations of forskolin.
- the wo cell lines used in the assay were the parental human tracheal cell line 9HTEo-, and its multidrug resistant subclone 9HTEo-/Dx that strongly expresses MDR-1 (Rasola et al., J. Biol. Chem. 269:1432-1436 (1994)).
- the results show that the 9HTEo-/Dx cells accumulate much less rhodamine 123 than 9HTEo- cells as a consequence of MDR-1 mediated dye extrusion. Dye accumulation was increased significantly by the MDR-1 inhibitor verapamil, but was not affected by compounds P-1 or S-1 (Fig. 6, panel B).
- Fig. 7, panel A shows the results of the patch-clamp analysis.
- A. Cell-attached patch-clamp recordings show ⁇ F508-CFTR channel activity in the presence of forskolin (20 ⁇ M) (top) and after addition of the phenylglycine containing compound P-1 or sulfonamide containing compound S-1 (100 nM, bottom). The closed channel level is indicated by a dashed line. Downward deflections indicate channel opening. The large increase in channel activity caused by the potentiators seen by the appearance of multiple channel openings of long duration.
- Fig. 7, panel B shows the averaged channel open probabilities (Po) (SEM) from data as in Fig. 7, panel A.
- analysis of gating kinetics shows that the increase in Po was due to a reduction in mean channel closed time (Tc) rather than an increase in mean channel open time (To) (Fig. 7, panel B).
- the compounds were tested with the "class III" gating defective mutant CFTRs G55 ID-CFTR and G1349D-CFTR.
- the G55 ID-CFTR and G1349D-CFTR mutations produce a severe gating defect without impairment in protein trafficking (Gregory et al., MCB 11 :3886-3893 (1991). These mutations affect the glycine residues in NBD1 and NBD2 that are highly conserved in ATP-binding cassette proteins (Hyde et al., 1990; Logan et al., 1994).
- the G55 ID-CFTR gating defective mutant is the most common CFTR gating mutant that causes CF.
- the results show that the phenylglycine containing compounds corrected defective gating in a number of CF-causing CFTR mutants including ⁇ F508, G551D, G1349D and Dl 152H.
- the G551D and G1349D mutations affect critical glycine residues in nucleotide binding domains 1 and 2 of CFTR, respectively (Hyde et al., Nature 346:362-365 (1990)), producing a pure gating defect of greater severity than that in ⁇ F508-CFTR (Gregory et. al., MCB 11 :3886-3893 (1991); Logan et. al., J. Clin. Invest.
- Fig. 10 shows the results of the G55 ID-CFTR activity in nasal polyp epithelial cells from G55 ID-CFTR human subject in response to the subject compounds.
- Epithelial cells were plated on permeable supports to generate polarized monolayers resembling the epithelium in vivo.
- CFTR-dependent chloride secretion was stimulated with forskolin at maximal concentration.
- the . phenylglycine containing compound P-1 further increased CFTR-mediated currents. This effect was fully blocked by CFTR inhibitor CFTR inh -172.
- Mass spectrometry identified the original compound, and Ml and M2 with m/z 456 (-PG-01+OH; [M+l] + ) and 472 (-P-1+2OH; [M+l] + ), respectively (Fig. 11, panel A, top, middle). A minor metabolite was also detected at 7.43 min with m/z 428. Approximately 90 % of compound P-1 was metabolized after incubation with microsomes for 1 hour in the presence of NADPH, and non-metabolized compound P-1 was not detectable after 2 hours. Fig.
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AU2005251745A AU2005251745A1 (en) | 2004-06-04 | 2005-06-02 | Compounds having activity in increasing ion transport by mutant-CFTR and uses thereof |
EP05786718A EP1765347A4 (en) | 2004-06-04 | 2005-06-02 | Compounds having activity in increasing ion transport by mutant-cftr and uses thereof |
CA002569402A CA2569402A1 (en) | 2004-06-04 | 2005-06-02 | Compounds having activity in increasing ion transport by mutant-cftr and uses thereof |
US11/628,411 US7939558B2 (en) | 2004-06-04 | 2005-06-02 | Compounds having activity in increasing ion transport by mutant-CFTR and uses thereof |
US13/088,216 US20120101143A1 (en) | 2004-06-04 | 2011-04-15 | Compounds Having Activity in Increasing Ion Transport by Mutant-CFTR and Uses Thereof |
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US20120101143A1 (en) | 2012-04-26 |
AU2005251745A1 (en) | 2005-12-22 |
US20080319008A1 (en) | 2008-12-25 |
CA2569402A1 (en) | 2005-12-22 |
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US7939558B2 (en) | 2011-05-10 |
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