WO1998009523A1 - Compositions and methods for treatment of neurological disorders and neurodegenerative diseases - Google Patents
Compositions and methods for treatment of neurological disorders and neurodegenerative diseases Download PDFInfo
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- WO1998009523A1 WO1998009523A1 PCT/US1997/015321 US9715321W WO9809523A1 WO 1998009523 A1 WO1998009523 A1 WO 1998009523A1 US 9715321 W US9715321 W US 9715321W WO 9809523 A1 WO9809523 A1 WO 9809523A1
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- A61K38/193—Colony stimulating factors [CSF]
Definitions
- the present invention relates to compositions and methods for the treatment of various neurological diseases and neurodegenerative disorders, particularly those affected by an overabundance of Amyloid Precursor Protein (APP) .
- APP Amyloid Precursor Protein
- cAMP cyclic adenosme monophosphate
- certain substances can inhibit APP synthesis, either directly or by antagonizing receptors coupled to cAMP formation.
- AD Alzheimer's Disease
- AD is the most common neurodegenerative disorder of aging, and is characterized by progressive dementia and personality dysfunction.
- the abnormal accumulation of amyloid plaques in the vicinity of degenerating neurons and reactive astrocytes s a pathological characteristic of AD.
- the estimated cost of caring for the approximate 2.5-4.0 million AD cases in the USA exceeded $60 billion m 1991 alone.
- AD will no doubt become an escalating healthcare problem of unparalleled proportions as the world's geriatric population grows . Much work remains in the quest to find an effective treatment for AD.
- APP processing is regulated oy neurotransmitters and synaptic activity.
- Amyloid plaques in AD accumulate near dystrophic neurons and reactive astrocytes.
- B. Cordell Ann u . Rev. Pharmacol . Toxicol . 34, 69 (1994); D. J. Selkoe, Annu . Rev . Nauroscx . 17, 489 (1994).
- the activation of neurotransmitter receptors which are coupled to phosphotidylinositol (PI) hydrolysis or to protein kmase C (PKC) activation, can promote APP metabolism and decrease amyloid formation.
- PI phosphotidylinositol
- PLC protein kmase C
- the inhibitory effect of cAMP on APPs secretion may be specific for astrocytic cells in that cAMP and PKA activation reportedly stimulate APPs secretion in pheochromocytoma PC-12 and human embryonic kidney cells.
- cAMP and PKA activation reportedly stimulate APPs secretion in pheochromocytoma PC-12 and human embryonic kidney cells.
- APP isoforms ranging in size from 695-770 amino acids, are derived by differential splicing of a primary transcript. Of the three major APP isoforms, APP ⁇ 95 is predominantly expressed in neurons; APP751 and APP770, which harbor an additional Kunitz-type protease inhibitor
- KPI KPI insert at the N-termmus
- GFAP glial fibrillary acidic protein
- AD bram the loss of synapses is associated with an increase m the number of GFAP-positive astrocytes [Brun et al . , Neurodegenera tion , 4, 171 (1995)], and increases in KPI- contaming APP mRNA in the frontal cortex have also been attributed to the astrocytic response during neuronal damage [Golde et al., Neuron, 4, 253 (1990)]. It seems that the loss of synapses and neurons in AD might initiate a pathological cascade that includes APP synthesis by reactive astrocytes .
- Cytosolic phospholipase A 2 which releases arachidonic acid from cellular phospholipids, is elevated m AD brain and after transient global ischemia. Stephenson et al., Neurobiol . Disease, 3, 51 (1996); Clemens et al., Stroke, 27, 527 (1996).
- the cyclooxygenation of arachidonic acid produces prostagland s which, in turn, regulate neurotransmission, immune and inflammatory responses by activating receptors coupled to cAMP formation.
- cAMP elevations caused by activation of neurotransmitter receptors increased APP mRNA and holoprotein production in astrocytes.
- the production of APP by mammalian cells, particular, by cells in the brain can be increased or reduced.
- the present invention seeks to provide compositions and methods that alleviate the detrimental effects of inappropriate APP production arising from overstimulation of receptors, particularly those coupled to cAMP formation.
- neurological diseases and neurodegenerative disorders such as Alzheimer's, Parkinson's, or Lou Gehrig' s Disease (amyotrophic lateral sclerosis), multiple sclerosis and the like, which may have their roots in the formation or presence of amyloid plaques .
- the present invention also contemplates and provides an assay for identifying or screening potential drugs that can inhibit the excessive or inappropriate production of amyloidogenic or neurotoxic APP fragments.
- an assay may utilize a tissue or cell culture comprising brain cells, as described herein.
- the invention also contemplates a method by which the overexpression of APP is deliberately effected, followed by the promotion or stimulation of APP metabolism to provide soluble APP (APPs) .
- the former step can be attained by, for example, cAMP signaling, while the latter process can be accomplished, for example, by the activation of protein kinase C (PKC) or of neurotransmitter agonists (e.g., via ml, m3, seroton ergic, or metabotropic glutamate receptors) which increase phophotidyl ositol (PI) hydrolysis. Consequently, increased amounts of APPs are secreted into the medium, and the formation of amyloidogenic A ⁇ peptides is disrupted. It is believed that secreted APPs have neurotrophic and neuroprotective functions. Secreted APPs have been shown to promote neurite outgrowth and maintain synapse.
- PLC protein kinase C
- PI phophotidyl ositol
- APPs secretion promotes synaptic transmission and neuronal regeneration (e.g., via neurite or axonal outgrowth).
- the net result is the conversion of an amyloidogenic event (i.e., APP overexpression and A ⁇ formation) into a neurotrophic event (i.e., APPs secretion).
- FIG. 1A illustrates the effects of norepmephrme (NE) and propranolol on the expression of cell-associated APP (APP holoprotein);
- FIGS. IB and IC show that norepmephrme or the ⁇ -adrenergic agonist isoproterenol stimulates APP mRNA production, and that these stimulatory effects are abolished by the antagonist propranolol.
- FIG. 2 illustrates the effect of propranolol on the changes in PI hydrolysis and cAMP formation caused by NE treatment .
- FIGS. 3A and 3B illustrate the effects of PMA and dexnorfenfluramine (DNF) on cell-associated APP and APPs secretion .
- DNF dexnorfenfluramine
- FIGS. 4A and 4B illustrate the effects of 8Br-cAMP and forskolin on cell-associated APP and GFAP from cultured astrocytes .
- FIGS. 5A and 5B illustrate the effects of 8Br-cAMP on APPs secretion from cultured astrocytes.
- FIG. 6 illustrates the effect of 8Br-cAMP on APP mRNA.
- FIG. 7 illustrates the effects of 8Br-cAMP or NE on ⁇ - actin and APP mRNA.
- FIG. 8 illustrates the effects of forskolin or 8Br-cAMP on GFAP expression in cultured astrocytes.
- FIGS. 9A, 9B and 9C illustrate the effect of cyclosporin A on APPs secretion and cell-associated APP, in the absence or presence of 8Br-cAMP.
- FIGS. 10A, 10B, IOC and 10D illustrate the effects of PG E 2 in increasing cellular levels of APP holoprotein, levels of secreted APP, and cellular cAMP levels.
- FIGS. 11A and 11B illustrate the effects of 8Br-cAMP and forskolin on cellular cAMP levels, and on levels of APP mRNA, APP holoprotein, and GFAP.
- FIGS. 12A and 12B illustrate the effects of Sp-cAMPS triethylamine on APP holoprotein levels, and the effects of the PKA inhibitor H-89 on APP mRNA and APP holoprotein stimulated by PG E 2 .
- FIGS. 13A, 13B and 13C illustrate the effects of cyclosporin A or FK-506 on increases in APP mRNA, APP holoprotein, and GFAP levels stimulated by PG E2 or forskolin .
- FIG. 14 illustrates the effects of cyclosporin A an FK-506 on cellular cAMP levels stimulated by PG E 2 .
- FIGS. 15A, 15B and 15C illustrate the effects o nicotine ditartrate in increasing cellular levels of AP holoprotein, and the effects of EGTA and KN-93 on levels o APP holoprotein stimulated by PG E 2 .
- the inventors have shown that the activation of adrenergic receptors present in the cortical astrocytes by 50 ⁇ M norepmephrme (NE) for a period of about 24 h increases the amount of APP holoprotein by ⁇ 1.7-fold relative to amounts in untreated cells (See, FIG. 1, A) , as measured using Western blots.
- the stimulatory effect of NE on total APP protein is inhibited by the ⁇ - adrenergic antagonist propranolol (50 ⁇ M) which, on its own, has no significant effect on basal APP protein levels.
- APP mRNA levels are about 1.7-fold and about 1.6-fold higher after 24 h treatment with NE (50 or 100 ⁇ M) or the ⁇ -adrenergic agonist isoproterenol (50 ⁇ M) , respectively, than those in untreated cells (FIG. 1, B) ; these increases are also abolished by 50 ⁇ M propranolol (FIG. 1, C) .
- NE can stimulate cAMP formation and PI hydrolysis by activating ⁇ - or ⁇ 2 -adrenerg ⁇ c receptors, respectively.
- Propranolol inhibits the NE-induced (50 ⁇ M) increase in cAMP formation but not the increase in PI hydrolysis (FIG. 2), suggesting that activation of ⁇ -adrener:r ⁇ c receptors stimulates APP gene expression in cultured cortical astrocytes by enhancing cAMP synthesis .
- FIGS. 5A and 5B Nortnern blot analyses show that treatment with 250 ⁇ M 8Br-cAMP for 24 h increases astrocytic APP mRNA levels to -1.8-fold those of untreated cells (FIG. 6). This result indicates that prolonged (-24 h) cAMP signaling in cultured astrocytes can stimulate APP synthesis by transcriptional activation.
- 8Br-cAMP Although exposure to 50 or 100 ⁇ M 8Br-cAMP occasionally increases APP mRNA, these effects are not consistent. No significant changes in APP mRNA levels are detected after 6 h or 12 h treatment with 8Br-cAMP (250 ⁇ M) . The inventors have also observed that the APP transcript in astrocytes treated with or without 8Br-cAMP has a slower mobility than that observed in neurons. Hence, the APP mRNA that is upregulated by 8Br-cAMP treatment may contain the KPI motif. The increases in APP mRNA that is caused by 8Br-cAMP (250 ⁇ M) or NE (50 ⁇ M) are associated with decreases in levels of mRNA for ⁇ -act (FIG. 7) .
- the downregulation of cytoskeletal stress fibres may be related to the morphological differentiation of astrocytes from flat, polygonal cells to process-bearing, stellate cells.
- GFAP expression m cultured astrocytes is also increased by elevations m cAMP levels (FIG. 4; FIG. 8).
- FIG. 4; FIG. 8 These morphological and biochemical changes that are induced by 8Br-cAMP in cultured astrocytes resemble the gliotic response of astrocytes in vivo .
- cyclosporin A (1, 5, or 10 ⁇ M) inhibits the increase in APP mRNA and APP holoprotein which is caused by 24 h exposure to 8Br-cAMP (250 ⁇ M) .
- the inhibitory effects of 1, 5, or 10 ⁇ M cyclosporin A do not differ significantly (FIG. 9).
- Basal APP holoprotein levels, APPs secretion and GFAP expression also are unaffected by these concentrations of cyclosporin A (p>0.05).
- immunosuppressants such as cyclosporin A exhibit a potential usefulness for preventing aberrant APP expression in AD.
- Astrocytes and microglia both of which express APP751/770 isoforms containing the KPI domain, express only low levels of APP mRNA and protein in the resting state but upregulate KPI-contaming APP isoforms following bram injury or neurodegeneration.
- Our labelled APP cDNA probe did not distinguish between the various kinds of APP transcripts on Northern blots. However, Western blot analyses using antiserum R98 [Kametani et al . , Biochem .
- APP synthesis in astrocytes is probably mediated by the increases in cAMP production stimulated by PG E 2 treatment. Concentration-dependent elevations cAMP were observed after treatment with 1, 10 or 100 ⁇ M PG E 2 but not with 0.1 ⁇ M PG E 2 . Similarly, 1, 10 or 100 but not 0.1 ⁇ M PG E 2 stimulated increases in APP mRNA and holoprotein. Furthermore, the stimulatory effect of PG E 2 on APP synthesis was also mimicked by membrane-permeant 8Br-cAMP (250 ⁇ M) or by activating adenylate cyclase with forskolin (10, 50 or 100 ⁇ M) .
- the APP promoter contains several seguences for regulatory elements that are responsive to cAMP signalling. Salbaum et al . , EMBO J. , 7, 2807 (1988). PKA can phosphorylate cAMP response element binding protein (CREB) to stimulate gene expression. While there is no canonical sequence for CREB (TGACGTCA) within the 3.7-kb region upstream of the APP transcription start site [Salbaum et al., ibid] , a consensus sequence for CREB (TGACCTCA) could be responsible for initiating APP synthesis in astrocytes. Elevations in cAMP may also induce c-fos and c-jun expression to activate APP synthesis through AP-1 recognition sites.
- CREB cAMP response element binding protein
- cyclosporin A and FK-506 are inhibitors of calcineurin and can suppress gene activation stimulated by cAMP .
- Schwanmger et al . J. Biol . Chem . , 270, 8860 (1995).
- cyclosporin A inhibited APP synthesis in astrocytes treated with 8-Bromo- cAMP but we did not determine if cyclosporin A would inhibit APP synthesis stimulated by first messengers.
- cyclosporin A or FK-506 completely abolished APP overexpression stimulated by PG E 2 or by forskolin. Both cyclosponn A and FK-506 bind to intracellular lmmunophilm receptors that are not known to directly affect cAMP production. Clardy, PNAS USA, 92, 56 (1995) . As expected, neither cyclosporin A nor FK-506 had any effect on basal cAMP levels in cultured astrocytes, and neither drug inhibited the increase in cAMP caused by PG E 2 . Hence, the inhibitory effect of cyclosporin A or FK-506 appears to lie downstream of cAMP production and possibly by interfering directly with gene transcription.
- cyclosporin A and FK-506 are potent lmmunosuppres ⁇ ive drugs generally used to prevent rejection of organ transplants and autoimmune diseases, our data suggest that both these immunosuppressants may be useful for preventing aberrant APP overexpression.
- AD is not usually considered to be an inflammatory or immune disease.
- increased lipid peroxidation and formation of prostaglandins have been reported in AD. Iwamoto et al., J. Neurol . , 236, 80 (1989); Subbarao et al . , J. Neurochem . , 55, 342 (1990).
- all major components of the classical complement pathway appear to be associated with AD lesions, suggesting that neuronal damage or amyloid deposits may trigger inflammatory or immune processes and accelerate neuropathology . McGeer and McGeer, Brain Res . Rev. , 21, 195 (1995).
- APP overexpression in cultured astrocytes treated with PG E was associated with the secretion of APP holoprotein.
- secreted APP is usually truncated at the C- ter mus
- antisera C8 which is directed at the C-termmus of APP [Selkoe et al . , PNAS USA, 85, 7341 (1988)] detected increased amounts of APP holoprotein ( ⁇ 130kD) in the media of astrocytes treated with PG E 2 for 24 h.
- the present findings are consistent with the observation that Chinese hamster ovary cells transfected with full-length APP751 cDNA also secrete soluble APP holoprotein. Ef imiopoulos et al .
- APP holoprotein can be detected m the cerebrospmal fluid of humans, and can be actively released from secretory vescicles in response to receptor stimulation or neuronal depolarization. It s not known if secreted APP holoprotein is reinternalized for subsequent processing, or if it can be metabolized in the extracellular space.
- APP isoforms with and without KPI domains have different functions m the nervous system.
- the KPI domain of APP is highly homologous to the Kunitz -type of se ⁇ ne protease inhibitors, and secreted APP isoforms containing the KPI domain has been identified as protease nexm II. Oltersdorf et al., Na ture, 341, 144 (1989); van Nostrand et al., Na ture, 341, 546 (1989) .
- Protease inhibitors expressed by reactive astrocytes can also form protease-protease inhibitor complexes to induce the synthesis of cytokines, acute phase protein and the migration of neurotrophils which
- immunosuppressants such as cyclosporin A or FK-506 may be especially useful in preventing transcriptional activation of APP and, possibly, the progression of AD.
- the present studies show that stimulation of adrenergic receptors coupled to cAMP formation in astrocytes increases the production of APP mRNA and APP holoprotein. It is suggested that the upregulation or aberrant activation of ⁇ 2 -adrenerg ⁇ c receptors in brain regions that are vulnerable to damage can stimulate transcriptional activation of APP synthesis in astrocytes and, thereby, contribute to amyloid production.
- APP overexpression can cause neurodegeneration and cognitive dysfunction
- the inventors have shown that such substances as propranolol or immunosuppressants, e.g., cyclosporin A, FK-506, ion channel modulators, e.g., EGTA, calcium/calmodulm kinase inhibitors, e.g., KN-95, and the like, are promising drug candidates for the treatment of AD.
- propranolol or immunosuppressants e.g., cyclosporin A, FK-506, ion channel modulators, e.g., EGTA, calcium/calmodulm kinase inhibitors, e.g., KN-95, and the like.
- the present invention is directed to a method of modulating the expression, production, or formation of amyloid precursor protein (APP) m a subject comprising administering to the subject an effective amount of cyclic adenosme monophosphate (cAMP) , an analog of cAMP, a substance that is a ligand, an agonist, or an antagonist of a receptor that is coupled to the cellular levels of cAMP or to ion channels, a compound that regulates ion channels or the nuclear actions of cAMP, or a compound that regulates the activity of protein kinase A.
- the analog of cAMP can comprise 8Br-cAMP
- the ligand can comprise norepinephrine
- the agonist can comprise isoproterenol
- the antagonist can comprise propranolol .
- nuclear actions is meant any activity of cAMP that is exerted in the nucleus of a eukaryotic cell that ultimately gives rise to cnanges the expression, production, formation, metabolism, or amount of APP in a sub ect, including but not limited to tne regulation of the promoter of tne APP gene, the modulation of transcription factors that affect APP expression, or the stimulation of the activity of cAMP-dependent protein kinase.
- a suitable antagonist can comprise a receptor antagonist of a neurotransmitter, a modulator of signal transduction, an lmmunosuppressant , an anti-inflammatory agent, or combinations thereof.
- the modulator selected can modulate the activity of protein kinase A but does not activate protein kinase C. Still in other embodiments the modulator selected does not activate phosphate activity.
- the expression, production, or formation of APP can be modulated in an initial or first step, followed by the modulation of kinase or phosphatase activity with the objective, for example, of processing or metabolizing overproduced APP into nonamyloidogenic or neurotrophic metabolic products.
- the ligand, agonist, or antagonist of a receptor can be those substances that bind or exhibit an affinity for a receptor that can comprise a ⁇ - adrenergic, serotonmergic, dopaminergic, adenosme, vassopressm intestinal peptide, pituitary adenylate cyclase activating peptide (PACAP) , prostaglandin E2, histamme, muscarinic, nicotmic, opioid, GABA, or metabotropic glutamate receptor.
- PACAP pituitary adenylate cyclase activating peptide
- kinase stimulators are also suitable for use in the present invention, including staurospo ⁇ ne, auranofin, N- (6-am ⁇ nohexyl) -1-naphthalen-sulfonamide hydro- chloride, N- (4-ammobutyl) -2-naphthalenesulfonamide hydro- chloride, N- (4-am ⁇ nobutyl) -5-chloro-2-naphthalenesulfonamide hydrochloride, N- ( 6-am ⁇ nohexyl) -5-chloro-l-naphthalene- sulfonamide hy ⁇ rochloride, 1- ( 5- ⁇ soqu ⁇ nolmesulfonyl) -2- methylpiperazme dihydrochloride, N- (2- (methylam o) ethyl ) - 3- ⁇ soqumol ⁇ nesulfonamide dihydrochloride, N- (2-ammoethyl ) - 5-
- the preferred substance can comprise Sp-cAMPS triethylamme .
- the syntnesis of endogenous APP can be stimulated or, alternatively, suppressed.
- the overproduction can be effected by increasing the levels of cellular cAMP.
- the increase in the levels of cellular cAMP can, in turn, be effected by exposing or administering to the subject effective amounts of exogenous cAMP .
- the exposure or administration is performed for a continuous period.
- the continuous period may be any suitable or practical length of time but, preferably, at least about six hours, at least about twelve hours, at least about twenty-four hours or more .
- An increase in the levels of cellular cAMP can also be effected by stimulating the synthesis of endogenous cAMP or by retarding the breakdown of cAMP.
- the synthesis of endogenous cAMP is stimulated by administering an effective amount of a prostaglandin, such as prostaglandin E2, and the like.
- a prostaglandin such as prostaglandin E2
- Other compounds that can be used to this end include forskolin and a mcotinic agonist, e.g., nicotine or a salt thereof, such as mcotinic ditartrate.
- cellular levels of cAMP are caused to diminish.
- the cellular levels of cAMP can be decreased by retarding the synthesis of endogenous cAMP or by stimulating the breakdown of cAMP.
- Substances such as H8, H9, propranolol, or Wm55212 can be administered to achieve this end.
- ion-channel modulators e.g., calcium channel blockers, including chelatmg agents such as EGTA, and calcium/calmodulm kinase inhibitors, such as KN93, can be employed.
- the production of APP is first enhanced, followed by the stimulation of APP processing or metabolism.
- the latter step can be accomplished by administering an effective amount of a substance that stimulates protein kinase C (PKC) activation, activation of phosphatases, or phosphatidyl inositol (PI) hydrolysis.
- PKC protein kinase C
- PI phosphatidyl inositol
- the objective is the conversion of an amyloidogenic event (APP overexpression) to a neurotrophic event (the secretion of APPs or other nonamyloidogenic by-products) .
- the stimulation of PKC for example, can be achieved with the administration of effective amounts of phorbol ester or diacylglycerol .
- the present invention also contemplates a method of modulating the production of amyloid precursor protein (APP) in a subject comprising regulating the expression of glial fib ⁇ llary acidic protein (GFAP) in the subject.
- APP amyloid precursor protein
- GFAP glial fib ⁇ llary acidic protein
- the production of APP is enhanced by stimulating the transcription or translation of GFAP mRNA.
- the production of APP is diminished by inhibiting the transcription or translation of GFAP mRNA.
- GFAP expression can be regulated by administering to the subject an effective amount of an anti-inflammatory agent, which are preferably selected from a corticosteroid, glucocorticoid, or an admixture comprising estrogen and estradiol.
- an anti-inflammatory agent which are preferably selected from a corticosteroid, glucocorticoid, or an admixture comprising estrogen and estradiol.
- An important aspect of the present invention concerns the treatment of a subject that has suffered an injury or trauma, especially to the head or bram, or of a subject that is, for some other or related reason, may be experiencing overstimulation of cAMP expression, production, formation (or, collectively, "synthesis").
- an immune system suppressant such as cyclosporin A or other similar suppressant .
- the present invention is also directed to a method of determining the capacity of a drug to inhibit the expression, production, or formation of amyloid precursor protein (APP) in a cell comprising contacting a drug with a cell culture that has been exposed to cyclic adenosine monophosphate (cAMP), an analog of cAMP, a substance that is a ligand, an agonist, or an antagonist of a receptor that is coupled to the cellular levels of cAMP, a compound that regulates the nuclear actions of cAMP, or a compound that regulates the activity of protein kinase A.
- cAMP cyclic adenosine monophosphate
- a substance that is a ligand an agonist, or an antagonist of a receptor that is coupled to the cellular levels of cAMP
- a compound that regulates the nuclear actions of cAMP or a compound that regulates the activity of protein kinase A.
- the level of mRNA or holoprotein produced from the cell culture in the presence of the drug is then compared with the level of mRNA or holoprotein produced from the cell culture in the absence of the drug.
- the cell can be any type of microbial, plant, or animal cell, so long as the cell has the capacity to express, produce, or otherwise form APP.
- the cell is preferably a eukaryotic cell. More preferably, the eukaryotic cell can further be a yeast cell, insect cell, invertebrate, vertebrate, or mammalian, including animal or human.
- the present invention is directed to a method of alleviating the negative effects of a neurological disorder or neurodegenerative disease stemming from the aberrant expression, production, or formation of amyloid precursor protein (APP) in a subject.
- an effective amount of an antagonist of a ⁇ -adrenergic receptor, which is coupled to the cellular levels of cAMP is administered to the subject suffering from the disorder or disease.
- the antagonist may comprise a receptor antagonist of a neurotransmitter, a modulator of signal transduction, an lmmunosuppressant , an anti- flammatory agent, or combinations thereof, preferably provided that the modulator does not activate protein kinase C.
- the present method of modulating amyloid precursor protein (APP) expression in a subject may also comprise administering to the subject an effective amount of a substance that regulates APP promoter activity, either by stimulating APP promoter activity or retarding it .
- the inhibition of APP promoter activity can, in turn, regulate the expression of abnormal forms of tau.
- the present invention also contemplates a method of regulating the expression of abnormal forms of tau m a subject comprising modulating amyloid precursor protein (APP) expression in the subject.
- compositions for modulating the expression, production, or formation of a ⁇ r loid precursor protein (APP) m a subject comprise a carrier and cyclic adenosine monophosphate (cAMP) , an analog of cAMP, a substance that is a ligand, an agonist, or an antagonist of a receptor coupled to the cellular levels of cAMP or to ion channels, a compound that regulates the nuclear actions of cAMP or ion channels, or a compound that regulates the activity of protein kinase A.
- cAMP carrier and cyclic adenosine monophosphate
- an analog of cAMP a substance that is a ligand, an agonist, or an antagonist of a receptor coupled to the cellular levels of cAMP or to ion channels
- a compound that regulates the nuclear actions of cAMP or ion channels or a compound that regulates the activity of protein kinase A.
- compositions comprising the active substances disclosed herein.
- these compositions include pharmaceutical compositions comprising a therapeutically effective amount of one or more of the active compounds or substances along with a pharmaceutically acceptable carrier.
- pharmaceutically acceptable carrier means a non-toxic, inert solid, semi-solid liquid filler, diluent, encapsulating material, formulation auxiliary of any type, or simply a sterile aqueous medium, such as saline.
- sugars such as lactose, glucose and sucrose, starches such as corn starch and potato starch, cellulose and its derivatives such as sodium carboxymethyl cellulose, ethyl cellulose and cellulose acetate; powdered tragacanth; malt, gelatin, talc; excipients such as cocoa butter and suppository waxes; oils such as peanut oil, cottonseed oil, safflower oil, sesame oil, olive oil, corn oil and soybean oil; glycols, such as propylene glycol, polyols such as glycerin, sorbitol, mannitol and polyethylene glycol; esters such as ethyl oleate and ethyl laurate, agar; buffering agents such as magnesium hydroxide and aluminum hydroxide; algmic acid; pyrogen-free water; isotonic saline, Ringer's solution; ethyl alcohol
- wetting agents such as sodium lauryl sulfate and magnesium stearate, as well as coloring agents, releasing agents, coating agents, sweetening, flavoring and perfuming agents, preservatives and antioxidants can also be present in the composition, according to the judgment of the formulator.
- antioxidants examples include, but are not limited to, water soluble antioxidants such as ascorbic acid, cysteine hydrochloride, sodium bisulfite, sodium metabisulfite, sodium sulfite, and the like; oil soluble antioxidants, such as ascorbyl palmitate, butylated hydroxyanisole (BHA) , butylated hydroxytoluene (BHT) , lecithin, propyl gallate, aloha-tocopherol and the like; and the metal chelatmg agents such as citric acid, ethylenediamine tetraacetic acicl (EDTA) , sorbitol, tartaric acid, phosphoric acid and the like.
- water soluble antioxidants such as ascorbic acid, cysteine hydrochloride, sodium bisulfite, sodium metabisulfite, sodium sulfite, and the like
- oil soluble antioxidants such as ascorbyl palmitate, butylated hydroxyanisole (BHA) ,
- a “therapeutically effective amount” or simply " 'effective amount” of an active compound is meant a sufficient amount of the compound to treat or alleviate the negative effects of a neurological disorder or neurodegenerative disease stemming from the aberrant expression, production, or formation of amyloid precursor protein (APP) at a reasonable benefit/risk ratio applicable to any medical treatment.
- APP amyloid precursor protein
- the specific therapeutically effective dose level for any particular patient will depend upon a variety of factors including the disorder being treated and the severity of the disorder; activity of the specific compound employed; the specific composition employed; the age, body weight, general health, sex and diet of the patient; the time of administration, route of administration, and rate of excretion of the specific compound employed; the duration of the treatment; drugs used in combination or coinciding with the specific compound employed; and like factors well known in the medical arts.
- the total daily dose of the active compounds of the present invention administered to a subject in single or m divided doses can be in amounts, for example, from 0.01 to 25 mg/kg body weight or more usually from 0.1 to 15 mg/kg body weight.
- Single dose compositions may contain such amounts or submultiples thereof to make up the daily dose.
- treatment regimens according to the present invention comprise administration to a human or other mammal in need of such treatment from about 1 mg to about 1000 mg of the active substance (s) of this invention per day multiple doses or n a single dose of from 1 mg, 5 mg, 10 mg, 100 mg, 500 mg or 1000 mg .
- the dose relatively high and/or at a substantially constant level for a given period of time, preferably, at least about six or more hours, more preferably, at least about twelve or more hours and, most preferably, at least about twenty-four or more hours.
- Liquid dosage forms for oral administration may include pharmaceutically acceptable emulsions, microemulsions , solutions, suspensions, syrups and elixirs containing inert diluents commonly used in the art, such as water, isotonic solutions, or saline.
- Such compositions may also comprise adjuvants, such as wetting agents; emulsifying and suspending agents; sweetening, flavoring and perfuming agents .
- sterile injectable aqueous or oleaginous suspensions may be formulated according to the known art using suitable dispersing or wetting agents and suspending agents.
- the sterile injectable preparation may also be a sterile injectable solution, suspension or emulsion in a nontoxic parenterally acceptable diluent or solvent, for example, as a solution in 1, 3-butanediol .
- acceptable vehicles and solvents that may be employed are water, Ringer's solution, U.S. P. and isotonic sodium chloride solution.
- sterile, fixed oils are conventionally employed as a solvent or suspending medium.
- any bland fixed oil can be employed including synthetic mono- or diglycerides .
- fatty acids such as oleic acid are used in the preparation of injectables.
- the injectable formulation can be sterilized, for example, by filtration through a bacteria-retaining filter, or by incorporating sterilizing agents in the form of sterile solid compositions, which can be dissolved or dispersed in sterile water or other sterile injectable medium just prior to use.
- sterilizing agents in the form of sterile solid compositions, which can be dissolved or dispersed in sterile water or other sterile injectable medium just prior to use.
- the most common way to accomplish this is to inject a suspension of crystalline or amorpnous material with poor water solubility.
- the rate of absorption of the drug becomes dependent on the rate of dissolution of the drug, which is, in turn, dependent on the physical state of the drug, for example, the crystal size and the crystalline form.
- Injectable depot forms can also be made by forming microcapsule matrices of drugs and biodegradable polymers, such as polylactide-polyglycoside . Depending on the ratio of drug to polymer and the composition of the polymer, the rate of drug release can be controlled. Examples of other biodegradable polymers include polyorthoesters and polyanhyd ⁇ des .
- the depot injectables can also be made by entrapping the drug in liposomes or microemulsions, which are compatible with body tissues .
- Suppositories for rectal administration of the drug can be prepared by mixing the drug with a suitable non- lmtating excipient, such as cocoa butter and polyethylene glycol which are solid at ordinary temperature but liquid at the rectal temperature and will, therefore, melt in the rectum and release the drug.
- a suitable non- lmtating excipient such as cocoa butter and polyethylene glycol which are solid at ordinary temperature but liquid at the rectal temperature and will, therefore, melt in the rectum and release the drug.
- Solid dosage forms for oral administration may include capsules, tablets, pills, powders, gelcaps and granules.
- the active compound may be admixed with at least one inert diluent such as sucrose, lactose or starch.
- Such dosage forms may also comprise, as is normal practice, additional substances other than inert diluents, e.g., tableting lubricants and other tableting aids such as magnesium stearate and macrocrystalline cellulose.
- the dosage forms may also comprise buffering agents. Tablets and pills can additionally be prepared with enteric coatings and other release-controlli: g coatings .
- compositions of a similar type may also be employed as fillers in soft and hard-filled gelatin capsules using such excipients as lactose or milk sugar as well as high molecular weight polyethylene glycols and the like.
- the active compounds can also be in micro-encapsulated form with one or more excipients as noted above.
- the solid dosage forms of tablets, dragees, capsules, pills, and granules can be prepared with coatings and shells such as enteric coatings and other coatings well known in the pharmaceutical formulating art . They may optionally contain opacifymg agents and can also be of a composition that they release the active ingredient (s; only, or preferably, in a certain part of the intestinal tract, optionally m a delayed manner. Examples of embedding compositions which can be used include polymeric substances and waxes.
- Dosage forms for topical or transdermal administration of a compound of this invention further include ointments, pastes, creams, lotions, gels, powders, solutions, sprays, inhalants or patches.
- the active component is admixed under sterile conditions with a pharmaceutically acceptable carrier and any needed preservatives or buffers as may be required.
- Ophthalmic formulations, ear drops, eye ointments, powcers and solutions are also contemplated as being within the scope of this invention.
- the ointments, pastes, creams and gels may contain, m addition to an active compound of this invention, excipients such as animal and vegetable fats, oils, waxes, paraffins, starch, tragacanth, cellulose derivatives, polyethylene glycols, silicones, bentonites, silicic acid, talc and zinc oxide, or mixtures thereof.
- excipients such as animal and vegetable fats, oils, waxes, paraffins, starch, tragacanth, cellulose derivatives, polyethylene glycols, silicones, bentonites, silicic acid, talc and zinc oxide, or mixtures thereof.
- Powders and sprays can contain, addition to the active compounds of this invention, excipients such as lactose, talc, silicic acid, aluminum hydroxide, calcium silicates and polyamide powder, or mixtures of these substances.
- Sprays can additionally contain customary propellants, such as chlorofluorohydrocarbons .
- Transdermal patches have the added advantage of providing controlled delivery of active compound to the body. Such dosage forms can be made by dissolving or dispersing the compound in the proper medium. Absorption enhancers can also be used to increase the flux of the compound across the skin. The rate can be controlled by either providing a rate controlling membrane or by dispersing the compound in a polymer matrix or gel.
- the present invention is useful m the treatment or alleviation of disease, especially those disorders related to neurological diseases or neurodegenerative disorders, such as Alzheimer's disease, Parkinson's disease, Lou Gehrig' s disease, or multiple sclerosis, to name a few, not to mention central or peripheral nervous system damage, dysfunction, or complications involving same stemming from edema, injury, or trauma.
- neurological diseases or neurodegenerative disorders such as Alzheimer's disease, Parkinson's disease, Lou Gehrig' s disease, or multiple sclerosis
- central or peripheral nervous system damage, dysfunction, or complications involving same stemming from edema, injury, or trauma Such damage, dysfunction, or complications may be characterized by an apparent neurological, neurodegenerative, physiological, psychological, or behavioral aberrations, the symptoms of which can be reduced by the administration of an effective amount of the active compounds or substances of the present invention.
- the administration of effective amounts of anti- mflammatory agents can suppress, inhibit, or neutralize the action of increased cAMP activity, which activity if unchecked leads to the overproduction of APP.
- NSAIDs non-steroidal anti- flammatory agents
- a variety of non-steroidal anti- flammatory agents (NSAIDs) are found to be suitable for reversing the stimulatory effects of cAMP, its derivatives, a ligand, an agonist, or an antagonist of a receptor that is coupled to the cellular levels of cAMP, or a compound that enhances the nuclear actions of cAMP .
- Suitable NSAIDs include, but are not limited to, Advil, Aspirm, Aleve, Anaprox, Diclofenac, Docosahexaenoic acid, Dolobid, Etodolac, Feldene, Flurbiprofen, Ibuprofen, lndomethacm, Ketorolac tromethamme, Lodine, Meclofenamate, 6-MNA, Motrin, Nalfon, Naprosyn, Nuprin, Orudis, Phenylbutazone, Piroxica , Phenylbutazone, Ponstel, Relafen, Salicylic acid, Sulindac sulfide, Tolect , Toradol, Voltaren; also 5-l ⁇ poxygenase inhibitors, phosphodiesterase inhibitors, or cyclooxygenase inhibitors (e.g., cyclosalicylazosulfapy ⁇ dme or azulfasalazine
- Suitable anti- flammatory agents may be salicylates, such as Asacol, Disalcid, Pentesa, Salflex, or Trilisate; steroids and their combinations, such as Aerobid, Aristocort, Azmacort, Beclovent, Beconase, Celestone, Cortenema, Cortifoa , Decadron, Delalone, Depo-Medrol, Dexacort, Epifoam, Hydeltra, Hydrocortone, Hydeltrasol, Medrol, Nasacort, Plaqueml, Pediapred, Rhmocort, Solu- Cortef, Vancenase, or Vanceril; receptor-site blockers, such as leukotriene, B 4 , C 4 , D 4 and EJ J receptor antagonists, prostanoid receptor antagonists, prostaglandin receptor antagonists, neurokin receptor antagonists, endothelin receptor antagonists, antihistamines , cytokme/interleuk receptor antagonists, or m
- the anti- inflammatory agent is selected from the group consisting of steroidal or non-steroidal anti-mflammatory agents, salicylates, steroids, receptor site blockers, or inhibitors of complement activation.
- certain lmmunotherapeutic treatments can be effective in reversing, inhibiting, or otnerwise, alleviating the negative effects of aberrant APP production.
- Sucn treatments mclu ⁇ e are not limited to, the administration of immunoglobulms or other agents for the regulation of cytokine activity, for T ⁇ and B-cell activation, for Fcg receptor blockade and for activating complement cascade; use of recomb ant C3, CR1 and CR2 as inhibitors of serum complement activation; immunotoxms, immunoligands or toxin fusion proteins; the administration of vaccines or the oral administration of antigens .
- Still other therapeutic "strategies" for preventing an immune or inflammatory reaction can be adopted including, but not limited to, cell/tissue transplantation, gene and stem cell therapy, adjuvant therapy, extracorporeal therapy; use of telerogenic peptides, plasmapheresis and lmmunoadsorption .
- Immune system suppressants effective in the methods of the present invention include, but are not limited to, immunomodulators, such as Ergamisol, Leukme, Neupogen, cyclophosphamide, colony-stimulating factors and the like, and immunosuppressives, such as Atgam, Azathioprine, 15- Deoxyspergualin, HypRho, Imuran, Methotrexate, 6- Mercaptopurme, Mycophenolate mefotil (RS-61443), MICRhoGAM, Misoprostol, Methylpredmsolone, Orthoclone, Prograf, Rapamycin, RhoGAM, Sandimmune, antithymocyte globulin (ATG) , antilymphocyte globulin (ALG) , monoclonal pan-T cell antibody (OKT3) and the like.
- immunomodulators such as Ergamisol, Leukme, Neupogen, cyclophosphamide, colony-stimulating factors
- Neurotransmitter antagonists or modulators of signal transduction can be used to suppress the overproduction or overexpression of APP.
- the affected neurotransmitters include, but are not limited to adenosine, adrenoreceptors, angiotensm, atrial natriuretic pepti ⁇ e, bomoesm, bradykmin, cholecystokm , gastrm, dopamme, en ⁇ othelm, GABA, glutamate, histamme, mterleuk ⁇ n-1 , serotonin, leukot ⁇ ene, muscarmic acetylcholme, neuropeptide Y, mcotinic acetylcholme, opioid, PAF, prostanoid, pur oceptors, somatostatin, tachykmm, thrombm, vascpressm and oxytocm, VIP and the like.
- modulators of kinase signaling include, but are not limited to phorbol esters, mdolactam, mezerm, diacylglycerol, cAMP, cGMP, and their analogs; forskolin, activators or inhibitors of adenylate and guanylate cyclase; modulators of calcium or potassium channels; G-protems; and the like.
- Examples of ion-channel modulators, e.g., antagonists, that can oe used according to the principles of the present invention include N-acetylprocamamide HC1, amilo ⁇ de HC1, 5- (N, N-dimethyl) -amiloride HC1, 5- (N-etnyl-N-isopropyl ) - amiloride, 5- (N, N-hexamethylene) -amiloride, 5- (N-methyl-N- lsobutyl ) -amiloride, 4-ammopy ⁇ d ⁇ ne, amiodarone HC1, apam , R( + )-Bay K 8644, benzamil HC1 , bepridil HCi, ⁇ - bungarotoxin, 2, 3-butaned ⁇ one monoxime, calciseptme , charybdotox , ⁇ -conotoxm GIIIA, ⁇ -conotoxin GVIA,
- HCI HCI, S (+) -niguldipine HCI, R (-) -niguldipine HCI, nimodipine, nitrendipme, 5-n ⁇ tro-2- (3-phenylpropylammo) benzoic acid (NPPB) , phenamil metnanesulfonate, N-Phenylanthranilic acid, phentolamme mesylate, pimozide, procamamide HCI, quinidme sulfate, quinine sulfate, ruthenium red, ryanod e, saxitox , tetraethylammonium chloride, tetrodotox , tetrodotoxin citrate, thapsigargm, tityustoxm-K ⁇ , TMB-8 HCI, tolbutamide, triamterene, ( ⁇ ) -verapam l HCI, S(-)- verapamil
- Astrocytes are isolated from cortices from postnatal rats. See, K. D. McCarthy and J. de Vellis, J. Cell Biol . 85, 890 (1980). In brief, dissected cortices were dissociated by trypsinization and t ⁇ turation through a flame-polished Pasteur pipette. Cells were plated onto poly- L-lysme coated 35- or 100 mm culture dishes at densities of about 10-25 cells/mm 2 .
- the initial culture media minimal essential medium (MEM, Gibco) containing 10% horse serum (BioWhittaker) , were aspirated after 2-5 h after plating to remove unattached cells and debris, and replaced with MEM containing 7.5% fetal bovine serum (FBS, BioWhittaker). Half the media was replaced with MEM/7.5% FBS twice weekly. Cells are kept at 37°C in a humidified 5% C0 2 /95% air incubator. Media are changed twice weekly. Immunocytochemical staining with antibodies against GFAP and tau shows that >90% of cultured cells are astrocytes and ⁇ 5% are neurons. Pharmacological manipulations are performed serum-free media on 7-14 DIV confluent astrocytes.
- MEM minimal essential medium
- FBS 7.5% fetal bovine serum
- astrocytes from 35 mm dishes are scraped m lysis buffer (60 iruM T ⁇ s/HCl, 4 % SDS, 20% glycerol, 1 mM dithiothreitol ) , ultrasonicated and coiled for 5 mm.
- the total amount of cell protein per dish estimated using the bicinchonmic acid assay, is not altered by pharmacological treatments.
- Bromphenol blue (0.1%) is added to each sample and equal amounts of protein (-75 mg/lane) are loaded on 10% SDS- polyacrylamide gels.
- culture media was collected after drug treatments and phenylmethylsulfonyl fluoride was added to a final concentration of 2mM.
- the media samples were then applied to Sephadex PD-10 desalting columns (Pharmacia) and eluted with distilled water. Column eluates were frozen and dried by vacuum centrifugation .
- the lyophilized proteins were reconstituted in 25 ⁇ L water followed by 25 ⁇ L of2X Laemmli gel loading buffer, and boiled for 5 mm.
- Monoclonal antibodies 22C11 and GFAP were used to detect the N-termmus of APP and glial fibrillary acidic protein respectively; antisera R37 and R98 (gifts of Dr. F. Kametam, Tokyo Institute of Psychiatry) were used to detected the C-terminus and KPI motifs of APP respectively; antiserum C8 (gift of Dr. D.
- cAMP Assay Levels of cyclic AMP were measured with [8- 3 H]- cAMP assay kit (Amersham TRK 432) m astrocytes grown on 35 mm dishes. In brief, after aspirating the medium and rinsing twice with 1 ml ice cold PBS, the cells were scraped 0.8 ml ce cold ethanol and sonicated. The cell suspension was incubated for 5 min at room temperature, centrifuged and the supernatant was dried in a rotary evaporator.
- RNA from astrocytes grown on 100 mm dishes is extracted by the acid guanidium thiocyanate-phenol- chloroform method. See, P. Chomcznski and N. Saachi, Anal . Biochem . 162, 156 (1987).
- the medium was aspirated and the cells were scraped in 1 mL of TRI Reagent. After incubation for 15 mm at room temperature, 0.2 ml chloroform was added, mixed vigorously with TRI Reagent and the mixture was stored for another 15 min at room temperature. After centrifugation at 12,000 g for 15 mm, 0.5 ml isopropanol was added to the aqueous phase of the mixture to precipitate RNA.
- RNA pellet collected by centrifugation (12,000g, 15 mm at 4°C) was washed with 70 % ethanol once and solubilized in an appropriate amount of Formazol (Molecular Research Center, Cincinnati, Ohio).
- RNA samples ( ⁇ 20 ⁇ g) were denatured by heating for 15 min at 60°C prior to loading onto 1.2% agarose-formaldehyde gels for electrophoresis.
- RNA was blotted onto Hybond polyvinyl membranes by overnight capillary transfer and fixed onto the membranes by UV light illumination.
- Membranes were pre-hybridized with Amersham Rapid-hyb (Amersham Lab, Arlington Heights, IL) buffer for 2 h and labeled overnight with a ⁇ 1.8 kb human APP cDNA (gift of Dr. Rachael Neve, McLean Hospital, Harvard Medical School, Belmont, MA) or human glyceraldehyde-3-phosphate dehydrogenase probe (G3PDH; Clontech) labelled with [ 32 P]dCTP using random primed extension (Amersham Megaprime DNA labelling kit) . Membranes were dried and exposed to Kodak X-ray film for 24 - 48 h with an Amersham enhancer sheet.
- the relative amounts of mRNA obtained by hybridization were estimated using densitometric analysis of autoradiographs .
- the levels of APP mRNA were normalized to the amounts of G3PDH mRNA and expressed as a ratio to the levels of untreated, control cells.
- Confluent monolayers of astrocytes prepared according to Example 5.1 and treated with serum-free media containing 50, 100, or 250 ⁇ M 8Br-cAMP for varying durations (1 h, 6 h, 12 h, or 24 h) .
- Levels of cAMP in astrocytes are measured with a [8- 3 H]-cAMP assay kit (Amersham TRK 432).
- astrocytes Cultures of astrocytes are also treated with norepinephrine (NE, 50 and 100 ⁇ M) or with NE plus propranolol (50 ⁇ M) . Cells are also exposed to NE (50 ⁇ M) or to the ⁇ -adrenergic agonist isoproterenol (50 ⁇ M) to stimulate APP mRNA synthesis.
- NE norepinephrine
- 50 ⁇ M propranolol
- the effects of other substances including PMA, DNF, 8Br-cAMP, forskolin, prostaglandin E2, H8, H9, in55212, Sp-cAMPS triethylamine and cyclosporin A are also observed, similarly.
- the present stu ⁇ ies indicate that immune system suppressants, such as cyclosporin A, can inhibit APP overexpression in GFAP-immunoreactive cultured astrocytes.
- Reactive astrocytes that s, astrocytes tnat have been activated or stimulated in some fashion, e.g., those associated with brain or neuronal injury
- m vivo also upregulate GFAP expression.
- the examination of post-mortem brains in patients with Alzheimer' s disease shows that reactive astrocytes are found in proximity to amyloid plaques and regions of neurodegeneration.
- the inventors believe that neuronal, r,ra ⁇ n, or head injury gives rise to the formation of reactive astrocytes, which overexpress APP and contribute to the formation of amyloid or neurotoxic APP derivatives.
- confluent primary rat cortical astrocytes which are treated with serum-free medium containing 50, 100, or 250 ⁇ M, respectively, of 8-Bromo-cAMP (8Br-cAMP) for 24 n, show a dose-dependent increase in APP mRNA on Northern blots (120%, 150% and 180% of untreated cells) .
- ⁇ -actm mRNA is decreased to 50% of untreated cells by 8Br-cAMP (250 ⁇ M) .
- Both L-norepinephrine (NE, 50 or 100 ⁇ M) and the ⁇ -adrenergic agonist isoproterenol (50 ⁇ M) increase APP mRNA to 180% of untreated cells.
- the ⁇ - adrenergic antagonist propranolol reduces the NE- stimulated increase in APP mRNA to baseline levels.
- N- and C-termmal APP antibodies 22C11 and R37 show that 8Br-cAMP or NE also increases APP holoprotein in cell lysates to 200% of that seen in untreated cells. Both drugs also increase process formation and glial fibrillary acidic protein immunoreactivity in astrocytes.
- activation of ⁇ -adrenergic receptors coupled to cAMP formation increases both APP mRNA and holoprotein reactive astrocytes.
- the APP gene promoter contains a consensus sequence for a cAMP response element (CRE) .
- CRE cAMP response element
- the lmmunosuppressant cyclosporin A (CycA, 10 ⁇ M) which is known to inhibit CRE- mediated transcription, blocks the increase in APP protein caused by 8Br-cAMP. This result suggests that CycA may be used to prevent increases in APP and, potentially, amyloid formation in neurodegenerative diseases, such as Alzheimer's disease . More specifically, and referring now to FIG. 1, confluent monolayers of astrocytes are incubated for 24 h m serum-free media containing 50, 100, or 250 ⁇ M 8Br-cAMP.
- A Representative immunoblot with mAb22Cll shows that astrocytes incubated with NE (50 ⁇ M) contain significantly more cell-associated APP relative to untreated control cells, Con (p ⁇ 0.05), and that this increase is inhibited by the ⁇ -adrenergic antagonist propranolol (Prop, 50 ⁇ M) .
- This experiment is replicated with similar results.
- B Representative Northern blot indicates that two doses of NE (50 or 100 ⁇ M) are equally effective m stimulating an increase in APP mRNA levels above those of controls (Con) , and that this effect is mimicked by the ⁇ -adrenergic agonist isoproterenol (Iso, 50 ⁇ M) .
- G3PDH mRNA is used as a control for RNA loading and is not affected by drug treatments.
- C The stimulatory effect of NE or isoproterenol on APP mRNA synthesis ( * , p ⁇ 0.05) is significantly inhibited by the ⁇ - adrenergic antagonist propranolol.
- PI hydrolysis and cAMP formation are significantly increased by 1 h treatment with NE (50 ⁇ M) .
- Co-mcubation with propranolol (50 ⁇ M) inhibits the increase in cAMP formation caused by NE (*, p ⁇ 0.05) but has no effect on the increase in PI hydrolysis.
- Graphs represent means and SEM that are obtained from three independent experiments.
- A is a representative immunoblot that shows that phorbol 12-myr ⁇ state 13-acetate PMA (5 ⁇ M) or dexnorfenfluramme hydrochloride DNF (100 ⁇ M) treatment of astrocytes prepared according to Example 5.1 for 1 hour significantly increases APPs secretion relative to untreated cells (Con) .
- B indicates that these same drugs have no effect on the amount of cell-associated APP (APP holoprotein) after 24 hours.
- APP is detected by mAb22Cll on both immunoblots.
- Three experiments produce similar results.
- Confluent astrocytes are prepared as in Example 5.1.
- the cells are scraped and suspended in SDS-reduc g sample buffer for loading on Western blots.
- FIG. 4 A xs a representative linmunoblot in which R37 antiserum and GFAP monoclonal antibody reveals two protein bands at -120 kD (APP) and -50 kD (GFAP), respectively.
- B charts the results of 24 h exposure of the cells to increasing concentrations of the cAMP analog, 8Br-cAMP, or forskolin (50, 100 or 250 ⁇ M) .
- the amounts of cell-associated APP increases with increasing concentrations of both drugs ( + , p ⁇ 0.05) .
- the graph presents data accumulated from 3 independent experiments .
- APPs in the media is detected as a -110 kD protein by mAb22Cll.
- A a representative immunoblot, shows that treatment with 250 ⁇ M 8Br-cAMP for ca. 1 hour suppresses APPs secretion. Greater amounts of APPs accumulates in the medium after 24 hour exposure to 8Br-cAMP versus 1 hour.
- B the graph shows that APPs is statistically significantly reduced ( * , p ⁇ 0.05) after about 1 hour of exposure to 8Br-cAMP, with the opposite trend after about 24 hour exposure.
- the graph represents the mean and SEM from three independent experiments .
- astrocytes prepared as in Example 5.1 are used.
- a representative Northern blot indicates an increase in APP mRNA with increasing concentrations of 8Br-cAMP.
- the G3PDH mRNA is unaffected by 8Br-cAMP treatments.
- Subsequent experiments show that 250 ⁇ M is the most effective and reliable 8Br-cAMP concentration for stimulating APP synthesis.
- FIG. 7 the usual astrocytes are incubated with 8Br-cAMP (250 ⁇ M) or NE (50 ⁇ M) for about 24 hours.
- a representative Northern blot shows that both drug treatments increase APP mRNA and decrease ⁇ -actin mRNA levels. Three independent experiments produce similar effects.
- astrocytes prepared according to Example 5.1 are treated with increasing concentrations of 8Br-cAMP or forskolin for 24 hours.
- 8Br-cAMP and forskolin both at 50, 100, or 250 ⁇ M
- the graph represents the mean and SEM obtained from 3 independent experiments.
- A is a representative immunoblot showing that the increase in cell-associated APP caused by 24 hour treatment with 8Br-cAMP (250 ⁇ M) is suppressed by co- treatment with 1 ⁇ M cyclosporin A.
- This immunoblot also shows that cyclosporin A alone has no effect on the basal APP levels.
- B a representative immunoblot showing that basal APPs secretion levels are unaffected by 24 hour treatment with 8Br-cAMP, with or without 1 ⁇ M cyclosporin A.
- C graphically shows how the suppression of the 8Br-cAMP- induced increase in cell-associated APP is not significantly different at three doses of cyclosporin A (1, 5, or 10 ⁇ M) .
- the graph represents the mean and SEM of pooled data obtained from 3 independent experiments.
- PG E coupled to cAMP production increases the expression of APP holoprotein and mRNA.
- astrocytes for 24 h with 1, 10 or 100 ⁇ M PG E 2 significantly increased the amounts of astrocytic APP mRNA ( ⁇ 4.5 kb) relative to untreated cells (all p ⁇ 0.05) (Fig. 10A) .
- Similar increases in APP holoprotein (-110-130 kD) were detected by mAb 22C11, antisera R37 or R98 on Western blots.
- Treatment with 1, 10 or 100 ⁇ M PG E 2 produced increases cellular APP holoprotein that were 1.4, 1.9 and 2.3-fold respectively of untreated, control cells (Fig. 10B) .
- APP secreted in the media was also increased by 24 h treatment with 1, 10 or 100 ⁇ M PG E 2 using mAb 22C11, antiserum R37 or C8 immunodetection (Fig. 10C) .
- Treatment with 1, 10 or 100 ⁇ M PG E 2 also stimulated dose- dependent increases in cellular cAMP levels to 27, 106 and 227-fold compared to that of untreated cells (Fig. 10D) ; 0.1 ⁇ M PG E 2 did not stimulate cAMP production, and did not significantly alter APP holoprotein or mRNA levels compared to untreated, control astrocytes (p>0.05) .
- Protein kinase A and cAMP regulate APP expression Treatment of astrocytes for lh with membrane-permeant 8Br-cAMP (250 ⁇ M) or by activating adenylate cyclase with forskolin (10, 50 or 100 ⁇ M) significantly increased cellular cAMP levels (Fig. 11A) , and similar increases in APP mRNA and holoprotein (Fig. 11B) .
- Activation of protein kinase A by 24 h treatment with 50, 100 or 150 ⁇ M Sp-cAMP triethylamme increased cellular levels of APP holoprotein to 1.6, 1.9 and 2.2-fold compared to untreated cells (Fig. 12A) .
- Immunosuppressants cyclosporin A or FK-506 inhibit APP synthesis stimulated by PG E 2 or cAMP elevations.
- the increases m astrocytic APP holoprotein and mRNA stimulated by 24 h treatments with 50 uM forskolin or 10 ⁇ M PG E 2 were significantly inhibited by co-treatment w rh either 50 ⁇ M cyclosporin A or 50 ⁇ M FK-506 (Fig. 13) .
- Fig. 14 Treatment of astrocytes with either cyclosporin A or FK-506 (both 50 ⁇ M) alone had no significant effect on basal APP holoprotein or cAMP levels (p>0.05).
- Nicotmic ditartrate coupled to cAMP production increases the expression of APP holoprotein.
- APP secreted in the media was decreased by 1 h treatment with 1, 10 or 100 ⁇ M nicotine ditartrate using mAb 22C11, antiserum R37 or C8 immunodetection (data not shown) .
- Ion-channel modulator EGTA and calcium/calmodulin kinase inhibitor KN-93 inhibit APP synthesis stimulated by PG E 2 .
- the invention provides compositions and methods for preventing, alleviating, or inhibiting abnormal APP synthesis by the administration of antagonists (e.g., propranolol) of receptors that are coupled to cAMP formation, particularly wnere the upregulation of such receptors and APP overexpression accompanies brain trauma, neurological disease, or neurodegenerative disorder.
- antagonists e.g., propranolol
- the administration of such receptor antagonists suppresses cAMP formation, which in turn inhibits abnormal APP synthesis.
- the invention provides relief from the neuropathological symptoms of diseases, such as Alzheimer's disease, by inhibiting aberrant APP gene expression. It is the overexpression of the APP gene that is believed to cause or strongly contribute to neurodegeneration and cognitive dysfunction in animals and humans.
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Also Published As
Publication number | Publication date |
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EP1006798A1 (en) | 2000-06-14 |
EP1006798A4 (en) | 2003-03-05 |
US6187756B1 (en) | 2001-02-13 |
US6043224A (en) | 2000-03-28 |
CA2279651A1 (en) | 1998-03-12 |
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