CN106053858A - Kit for detecting human brain diseases - Google Patents

Kit for detecting human brain diseases Download PDF

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CN106053858A
CN106053858A CN201610675219.0A CN201610675219A CN106053858A CN 106053858 A CN106053858 A CN 106053858A CN 201610675219 A CN201610675219 A CN 201610675219A CN 106053858 A CN106053858 A CN 106053858A
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ngb
neuroglobin
kit
aptamer
dna
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卢美珍
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    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/72—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving blood pigments, e.g. haemoglobin, bilirubin or other porphyrins; involving occult blood
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    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
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    • G01N33/68—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving proteins, peptides or amino acids
    • G01N33/6893—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving proteins, peptides or amino acids related to diseases not provided for elsewhere
    • G01N33/6896—Neurological disorders, e.g. Alzheimer's disease
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    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2800/00—Detection or diagnosis of diseases
    • G01N2800/28—Neurological disorders
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    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2800/00—Detection or diagnosis of diseases
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2800/00—Detection or diagnosis of diseases
    • G01N2800/28—Neurological disorders
    • G01N2800/2871—Cerebrovascular disorders, e.g. stroke, cerebral infarct, cerebral haemorrhage, transient ischemic event

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Abstract

The invention provides a kit for detecting and diagnosing human brain diseases. The kit mainly contains an aptamer for specific detection of human neuroglobin; the kit has relatively high sensitivity, can be used for detecting the content of neuroglobin in a sample, and can provide an effective detection means for early diagnosis and tracking of the disease course in the treatment process in neuronal damage, degeneration death and other diseases involved to senile dementia, cerebral infarction, traumatic brain injury and the like.

Description

A kind of test kit for human brain disease detection
Technical field
Present invention relates particularly to a kind of by detection people's Neuroglobin NGB detection people's disease of brain and the test kit of diagnosis.
Background technology
Neuroglobin NGB (Neuroglobin, NGB) is that internal the 3rd class in addition to hemoglobin and Myoglobin is important Oxygen carrying albumen, specifically expressing in nervous system, be distributed widely in cerebral tissue.The same with Myoglobin, Neuroglobin NGB energy Reversibly combine oxygen, and have the highest affinity with oxygen.Myoglobin content in normal human serum is atomic, when cardiac muscle and skeleton During muscle injury, Myoglobin can discharge from damaged cell, quickly enters blood, causes serum myoglobin to raise.Myoglobin becomes For the biochemical diagnosis index that some important diseases such as myocardial infarction, renal failure etc. clinically is sensitive and special.Brain red eggs White and Myoglobin in function and has strict similarity in nature: Neuroglobin NGB has 151 aminoacid, and molecular weight is 17,000 Dalton, Myoglobin then has 154 aminoacid, and molecular weight is also 17 kilodaltons.In view of Neuroglobin NGB and Myoglobin Functionally having strict similarity, i.e. Myoglobin and be responsible for the oxygen supply of cardiac muscle and skeletal muscle, Neuroglobin NGB is then responsible for brain Oxygen supply, both of which can be released into blood from damaging cells, and therefore, Neuroglobin NGB is in alzheimer disease, cerebral infarction, traumatic Brain injury etc. relate to have potential diagnostic value in the early diagnosis of the diseases such as neuronal damage and degeneration be dead, the most right The course of disease in above-mentioned treatment of diseases is followed the tracks of also has important reference value.Therefore, the containing of Neuroglobin NGB in detection blood Amount has great importance.
Phyletic evolution index concentration technology (SELEX technology) is a kind of new combination grown up early 1990s Chemical technology, it uses jumbo random oligonucleotide library, the outer PCR amplification technique of coalition, divides with target with index concentration The oligonucleotide of sub-specific bond, through multi-turns screen, it is thus achieved that affinity is high, the oligonucleotide aptamer of high specificity (aptamers).The own Successful utilization of this technology is in the screening of many target molecules, including metal ion, organic dyestuff, medicine, albumen Matter, aminoacid and various cytokines etc..
Summary of the invention
It is an object of the invention to the oligonucleoside by phyletic evolution index concentration technology (SELEX technology) screening Neuroglobin NGB Acid aptamer substitutes antibody, it is provided that a kind of succinct Neuroglobin NGB quick, high sensitivity, high specific detects in early days and separates Purification process.
Technical scheme:
For single stranded DNA random library and the primer of phyletic evolution index concentration technology screening in the present invention, by the U.S. Invitrogen company synthesizes, and two ends are fixed sequence program, and centre is the random sequence of 41 bases: 5'- TGGACCATTACGATCAACTA (N41) TAACCCGATACGATTATCCA-3', storage capacity is more than 1014；
Primer 1:5'TGGACCATTACGATCAACTA-3'；
Primer 2: 5'-TGGATAATCGTATCGGGTTA-3'.
People's Neuroglobin NGB is according to (Wu Yonghong etc., " high efficient expression, purification and the qualification of recombinant human neuroglobin ", China Biological engineering magazine, 2009,29 (9): 1～6) method prepare；
GelRed nucleic acid dye is purchased from Biotium company；
Nitrocellulose filter is purchased from U.S. Mi Libo (MilliPore) company；
It is Time Inc. that the purified reagent of oligonucleotide is purchased from sky, Beijing；
PCR kit and carrier T are purchased from U.S. Pu Luomaige (ftOmega) company.
A kind of affine people's Neuroglobin NGB nucleic acid aptamer, it is characterised in that nucleotides sequence is classified as: SEQ ID NO:1-17 appoints DNA molecular shown in one.
A kind of above-mentioned affine people's Neuroglobin NGB nucleic acid aptamer, it is characterised in that: the oligonucleotide with identical function is fitted Gamete homologous sequence accounts for more than 60%.
A kind of above-mentioned affine people's Neuroglobin NGB nucleic acid aptamer, it is characterised in that: derivative RNA sequence has identical merit Energy.
A kind of above-mentioned affine people's Neuroglobin NGB nucleic acid aptamer, it is characterised in that: for carrying out, with DNA sequence, the widow that hybridizes Nucleotide sequence.
A kind of above-mentioned affine people's Neuroglobin NGB nucleic acid aptamer, it is characterised in that: delete in any position of nucleic acid aptamer Except or increase the oligonucleotide aptamer sequence obtained by part oligonucleotide residues there is identical function.
A kind of above-mentioned affine people's Neuroglobin NGB nucleic acid aptamer, it is characterised in that: enter in any position of nucleic acid aptamer After the displacement of row nucleotide kind and rare bases, the oligonucleotide aptamer sequence obtained has identical function.
A kind of above-mentioned affine people's Neuroglobin NGB nucleic acid aptamer, it is characterised in that: enter in any position of nucleic acid aptamer Row phosphorylation, methylate, amino, sulfydryl, isotope, biotin, digoxin, fluorescent material, nano luminescent material or enzyme labelling After modification, the oligonucleotide aptamer sequence obtained has identical function.
A kind of above-mentioned affine people's Neuroglobin NGB nucleic acid aptamer, it is characterised in that: for people's Neuroglobin NGB detection and point From purification, thus for the detection of disease of brain.
The preparation method of a kind of above-mentioned affine people's Neuroglobin NGB nucleic acid aptamer, sequentially includes the following steps: 1) single stranded DNA with The synthesis of machine oligonucleotide library；2) utilize phyletic evolution index concentration method that oligonucleotide library is screened；3) amplification Oligonucleotide with human albumin specific bond；4) carry out next round screening, after 12 take turns above screening, obtain purpose widow's core Nucleotide sequence；5) cloning and sequencing.
The invention have the advantage that have simplicity, quickly, economic dispatch feature, with other combinatorial chemical libraries such as random peptide library, resist Body storehouse is compared with phage display libraries, the many advantages of aptamer tool filtered out from oligonucleotide library: 1) itself It is oligonucleotide, molecular weight, can be cost-effective with chemosynthesis；2) there is affinity more higher than antibody and specificity； 3) labelling and can be at different parts selectively labelling it is easy to；4) repeatability and good stability, and be prone to preserve, i.e. to height Gentle drastic conditions is insensitive.Therefore, phyletic evolution index concentration technology has a good application prospect.
Detailed description of the invention
The preparation of embodiment 1 people's Neuroglobin NGB
According to (Wu Yonghong etc., " high efficient expression, purification and the qualification of recombinant human neuroglobin ", Chinese biological engineering is miscellaneous Will, 2009,29 (9): 1～6) method prepare people's Neuroglobin NGB, protein concentration is 100mg/mL.
Embodiment 2-in-1 one-tenth random single-stranded DNA banks and primer
Random single chain DNA (ssDNA) library: 5'TGGACCATTACGATCAACTA (N41) TAACCCGATACGATTATCCA-3', constructs the ssDNA pool of a length of 81nt, and two ends are immobilized primer sequence, in Between be the random sequence of 41 bases, storage capacity is more than I014；Primer 1:5'TGGACCATTACGATCAACTA-3'；Primer 2:5'-TGGATAATCGTATCGGGTTA-3'；SsDNA pool and two kinds of primers are all become 100 μ with TE buffer The storage of mol/L stock solution _ 20 DEG C is standby.
Being double-stranded DNA by single-stranded DNA banks amplification, product is through 2% agarose gel electrophoresis and cuts glue recovery purification；To return The double-stranded DNA received is template, and in vitro transcription goes out single stranded RNA random library, and transcription product is through PAGE purification.75 μ g RNA library warps The anti-sieve of nitrocellulose filter removes the RNA molecule being combined with film, then with 2ug people's Neuroglobin NGB albumen, hatches 30min for 37 DEG C, Reactant liquor filters through nitrocellulose filter, washs filter membrane；Then filter membrane is shredded, be placed in elution buffer (6mol/L carbamide, 0.55mol/L ammonium acetate, l.5mmol/L EDTA, 0.15%SDS) in boil 5min, centrifugal, take supernatant, dehydrated alcohol precipitates RNA, and be redissolved in 20 μ 1 DEPC water；RNA library is gone out for template RT-PCR amplifying doulbe-chain DNA, in vitro transcription with RNA Screen for next round；Often in wheel screening process, RT-PCR obtains double-stranded DNA library, with this double-stranded DNA for template in vitro transcription Going out RNA aptamer storehouse, screening carries out 10 altogether and takes turns.Having obtained 17 aptamers, its sequence is respectively shown in SEQ ID NO:1-17. Particular sequence is as follows:
NGB-1:TGGACCATTACGATCAACTATTCTCAACAACTCCAACTTGTCCCTACCAAATTCGTACTTTTA ACCCGATACGATTATCCA；
NGB-2:TGGACCATTACGATCAACTAACAATATTCAAATTCTCTAAAACATCTTCCAATTCTCAATATA ACCCGATACGATTATCCA；
NGB-3:TGGACCATTACGATCAACTATTACACACAATCCTACCTATTTATCCCTACACATTCCCTCATA ACCCGATACGATTATCCA；
NGB-4:TGGACCATTACGATCAACTAACACACCAACCACTCCCTCTTCGCTTATTATCTCTACATATTA ACCCGATACGATTATCCA；
NGB-5:TGGACCATTACGATCAACTAACGCTTTATTATCATAAATATACATAACACCCAACACCTCCTA ACCCGATACGATTATCCA；
NGB-6:TGGACCATTACGATCAACTAATCGCTCAATACTCTGACCTATAATATAACGCTTACCTCCTTA ACCCGATACGATTATCCA；
NGB-7:TGGACCATTACGATCAACTACTAATACAATTCGCTCTCCCATACACCGCCTAAATTCATAATA ACCCGATACGATTATCCA；
NGB-8:TGGACCATTACGATCAACTAACTCGCTATATCCTGATATCCCTAACCGTTATACCTATAACTA ACCCGATACGATTATCCA；
NGB-9:TGGACCATTACGATCAACTATCATTTAATCAATACACATAGTATATATTCCGCCTACATTCTA ACCCGATACGATTATCCA；
NGB-10:TGGACCATTACGATCAACTACATCGCTAATTAACATCCCATCTGCCCAAAATAATCTTATTT AACCCGATACGATTATCCA；
NGB-11:TGGACCATTACGATCAACTATAGACATTGATCATCAGAATAACCCCAACTCCTCCCAATCTT AACCCGATACGATTATCCA；
NGB-12:TGGACCATTACGATCAACTATAACACTAATTAATTAAATATACACACTCCTATACCAATATT AACCCGATACGATTATCCA；
NGB-13:TGGACCATTACGATCAACTAACATCAGCAATCTCTCGCATATCTTTCATCCCTTCATCATTT AACCCGATACGATTATCCA；
NGB-14:TGGACCATTACGATCAACTAAATTCTATCCCAACGCTTACGCTTCCAAGAACATCTCCCTAT AACCCGATACGATTATCCA；
NGB-15:TGGACCATTACGATCAACTACTATTGAACATATTAGATCCGCACAATCTTTGTACATATACT AACCCGATACGATTATCCA；
NGB-16:TGGACCATTACGATCAACTAAAGATTATCCATAATGTTATAGTAACTCTGTAAACACTTTAT AACCCGATACGATTATCCA；
NGB-17:TGGACCATTACGATCAACTAATAGATCATCCGCTTTAACCCCGATAACTCTAAACGACTAAT AACCCGATACGATTATCCA；
The performance measurement of embodiment 3 protein binding aptamer
Aptamer taking 2.0 μ g respectively, digests lh with calf intestinal alkaline phosphatase (CIP) 37 DEG C, purification reclaims and removes phosphoric acid The RNA changed；By T4 polynucleotide kinase labelling [γ-32P] ATP in dephosphorylized RNA molecule end.10nmol radioactivity The aptamer of labelling people's Neuroglobin NGB 37 DEG C with variable concentrations (1-200nM) respectively hatches 30min, and each group reactant liquor is through nitric acid Cellulose membrane filters, and washs filter membrane, is dried filter membrane, and liquid scintillation counter measures the exit dose of residual on filter membrane, and same sample is parallel Do twice mensuration.Calculate the dissociation constant of each aptamer and destination protein.Result is as follows:
Aptamer specificity analyses and stability analysis described in embodiment 4
It is respectively adopted human albumin, immune globulin, pg120 albumen, escherichia coli outer membrane protein A, brain red eggs In vain, carrying out specific detection with 17 aptamers, find through binding tests, these aptamers are not tied mutually with these albumen Close, and only keep higher specificity with people's protein binding.
By described aptamer, take 0.2ug, be respectively placed in the serum of room temperature, aqueous solution, place two weeks.Pass through RT- PCR detects, and finds its Stability Analysis of Structures of placement of two weeks, is not degraded.
The diagnosis of aptamer disease described in embodiment 5
Take 8 alzheimer disease and Cerebral Infarction Patients and the blood of 4 normal persons, use normal saline dilution, it is thus achieved that mesh Standard specimen is originally.
By 17 markd aptamers of coupling respectively with the sample mixing 40min of 8 patients and 4 normal persons, logical Cross biotin to separate, the content of quantitative analysis people therein Neuroglobin NGB, found by analysis, Neuroglobin NGB in 8 patients Content dramatically increases, and has exceeded the threshold value of regulation.Reach the diagnostic criteria of corresponding encephalopathy.As can be seen here, its diagnosis effect is relatively Good.
These are only the preferred embodiments of the present invention, be not limited to the present invention, for those skilled in the art For Yuan, all any modification, equivalent substitution and improvement etc. done within the spirit and principles in the present invention, should be included in this Within the protection domain of invention.
Sequence table
＜ 110 ＞ Lu Meizhen
＜ 120 ＞ mono-kind is for the test kit of human brain disease detection
〈160〉17
〈210〉1
〈211〉 81
〈212〉DNA
＜ 213 ＞ artificial sequence
〈400〉NGB-1
TGGACCATTACGATCAACTATTCTCAACAACTCCAACTTGTCCCTACCAAATTCGTACTTTTAACCCGATACGATTATCCA;
〈210〉2
〈211〉 81
〈212〉DNA
＜ 213 ＞ artificial sequence
〈400〉NGB-2
TGGACCATTACGATCAACTAACAATATTCAAATTCTCTAAAACATCTTCCAATTCTCAATATAACCCGATACGATTATCCA;
〈210〉3
〈211〉 81
〈212〉DNA
＜ 213 ＞ artificial sequence
〈400〉NGB-3
TGGACCATTACGATCAACTATTACACACAATCCTACCTATTTATCCCTACACATTCCCTCATAACCCGATACGATTATCCA;
〈210〉4
〈211〉 81
〈212〉DNA
＜ 213 ＞ artificial sequence
〈400〉NGB-4
TGGACCATTACGATCAACTAACACACCAACCACTCCCTCTTCGCTTATTATCTCTACATATTAACCCGATACGATTATCCA;
〈210〉5
〈211〉 81
〈212〉DNA
＜ 213 ＞ artificial sequence
〈400〉NGB-5
TGGACCATTACGATCAACTAACGCTTTATTATCATAAATATACATAACACCCAACACCTCCTAACCCGATACGATTATCCA;
〈210〉6
〈211〉 81
〈212〉DNA
＜ 213 ＞ artificial sequence
〈400〉NGB-6
TGGACCATTACGATCAACTAATCGCTCAATACTCTGACCTATAATATAACGCTTACCTCCTTAACCCGATACGATTATCCA;
〈210〉7
〈211〉 81
〈212〉DNA
＜ 213 ＞ artificial sequence
〈400〉NGB-7
TGGACCATTACGATCAACTACTAATACAATTCGCTCTCCCATACACCGCCTAAATTCATAATAACCCGATACGATTATCCA;
〈210〉8
〈211〉 81
〈212〉DNA
＜ 213 ＞ artificial sequence
〈400〉NGB-8
TGGACCATTACGATCAACTAACTCGCTATATCCTGATATCCCTAACCGTTATACCTATAACTAACCCGATACGATTATCCA;
〈210〉9
〈211〉 81
〈212〉DNA
＜ 213 ＞ artificial sequence
〈400〉NGB-9
TGGACCATTACGATCAACTATCATTTAATCAATACACATAGTATATATTCCGCCTACATTCTAACCCGATACGATTATCCA;
〈210〉10
〈211〉 81
〈212〉DNA
＜ 213 ＞ artificial sequence
〈400〉NGB-10
TGGACCATTACGATCAACTACATCGCTAATTAACATCCCATCTGCCCAAAATAATCTTATTTAACCCGATACGATTATCCA;
〈210〉11
〈211〉 81
〈212〉DNA
＜ 213 ＞ artificial sequence
〈400〉NGB-11
TGGACCATTACGATCAACTATAGACATTGATCATCAGAATAACCCCAACTCCTCCCAATCTTAACCCGATACGATTATCCA;
〈210〉12
〈211〉 81
〈212〉DNA
＜ 213 ＞ artificial sequence
〈400〉NGB-12
TGGACCATTACGATCAACTATAACACTAATTAATTAAATATACACACTCCTATACCAATATTAACCCGATACGATTATCCA;
〈210〉13
〈211〉 81
〈212〉DNA
＜ 213 ＞ artificial sequence
〈400〉NGB-13
TGGACCATTACGATCAACTAACATCAGCAATCTCTCGCATATCTTTCATCCCTTCATCATTTAACCCGATACGATTATCCA;
〈210〉14
〈211〉 81
〈212〉DNA
＜ 213 ＞ artificial sequence
〈400〉NGB-14
TGGACCATTACGATCAACTAAATTCTATCCCAACGCTTACGCTTCCAAGAACATCTCCCTATAACCCGATACGATTATCCA;
〈210〉15
〈211〉 81
〈212〉DNA
＜ 213 ＞ artificial sequence
〈400〉NGB-15
TGGACCATTACGATCAACTACTATTGAACATATTAGATCCGCACAATCTTTGTACATATACTAACCCGATACGATTATCCA;
〈210〉16
〈211〉 81
〈212〉DNA
＜ 213 ＞ artificial sequence
〈400〉NGB-16
TGGACCATTACGATCAACTAAAGATTATCCATAATGTTATAGTAACTCTGTAAACACTTTATAACCCGATACGATTATCCA;
〈210〉17
〈211〉 81
〈212〉DNA
＜ 213 ＞ artificial sequence
〈400〉NGB-17
TGGACCATTACGATCAACTAATAGATCATCCGCTTTAACCCCGATAACTCTAAACGACTAATAACCCGATACGATTATCCA;

Claims (2)

1., for a test kit for human brain disease detection, it contains the aptamer that energy specificity is combined with people's Neuroglobin NGB.
2. test kit as claimed in claim 1, it is characterised in that: described aptamer sequence is as described in SEQ ID No:10.
CN201610675219.0A 2015-11-29 2015-11-29 Kit for detecting human brain diseases Pending CN106053858A (en)

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CN201610675217.1A Pending CN106053857A (en) 2015-11-29 2015-11-29 Kit for detecting human brain diseases
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CN201610675189.3A Pending CN106018847A (en) 2015-11-29 2015-11-29 Kit for human brain disease detection
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CN106018847A (en) 2016-10-12

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