CN1477399A - Method for detecting activity of nuclear trascription factor by using enzyme-linked immune mode - Google Patents
Method for detecting activity of nuclear trascription factor by using enzyme-linked immune mode Download PDFInfo
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- 108091023040 Transcription factor Proteins 0.000 claims abstract description 25
- 102000040945 Transcription factor Human genes 0.000 claims abstract description 25
- 108020004414 DNA Proteins 0.000 claims abstract description 21
- 102000039446 nucleic acids Human genes 0.000 claims abstract description 14
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Abstract
The method for detecting nuclear transcription factor activity by using enzyme-linked immune mode includes the following steps: enveloping prepared double-stranded DNA specifically combined with correspondent transcription factor in the enzyme-linked microplate well by means of nucleic acid adhesive liquor, then adding sample to be tested, making full reaction, successively adding monoclonal antibody aimed at correspondent transcription factor and IgG antibody marked by HRP, after full reaction successively adding chromogenic agent and terminator liquor, and using enzyme-linked immunodetection instrument to determine its absorbance value so as to attain the goal of detecting the nuclear transcription factor activity.
Description
(1), affiliated technical field
The present invention relates to a kind of Bioexperiment detection method, particularly a kind of method that detects the nuclear factor activity.
(2), technical background
Nuclear factor (Transcription factor) be a kind of DNA in conjunction with albumen, the expression of several genes is had powerful regulating action.The more nuclear factor of existing research has nuclear Factor-Kappa B (nuclear factor κ B, NF-κ B), AP-1 (c-Fos, FosB, and c-Jun), CREB etc.They generally are made up of the domain of two difference in functionalitys, be DNA binding structural domain (Binding domain, BD) and transcriptional activation domains (Activationdomain, AD) form, the former mainly is responsible for combining with special dna sequence dna, the latter has transcriptional activation activity, participates in the adjusting and the signal transduction of various kinds of cell function by the expression of regulating downstream gene.Studies show that, nuclear factor and various kinds of cell function (as the propagation of cell, differentiation etc.), immunological regulation, stress, generation, the development of inflammatory reaction and multiple disease be relevant, is the focus of above-mentioned area research in recent years.More and more evidences shows the variation energy significant reaction cell of nuclear factor activity, the pathologic, physiologic function change of tissue and generation, the development process of some diseases.Therefore, the further investigation of transcription factor is significant to the detection, prevention and the treatment that disclose body physiological function and disease.Some nuclear factor (as NF-κ B) has become the crucial target spot of drug screening, obtains extensive concern.In recent years, correlative study makes great progress.But at present the detection method of transcription factor activity is also backward relatively, far can not satisfy easily and fast the needs with high throughput testing, and this has limited the flow of research of relevant transcription factor and association area to a certain extent.The common method of existing detection nuclear factor activity has following three kinds:
1. (Electrophoretic mobility shiftassay, EMSA): this method mainly detects the ability of relevant nuclear factor in conjunction with specific DNA sequence in gel shift retardance experiment.Mainly be after the nuclear extract of cell and the double chain oligonucleotide probe (nucleotide sequence of corresponding transcription factor specific bond) through radiating plain mark are hatched a period of time jointly, by polyacrylate hydrogel electrophoresis and autoradiographic method, detect the ability that transcription factor combines with corresponding sequence.This method has sensitivity, special advantage, and be the more method of utilization at present, but exist following deficiency: (1) is very consuming time, generally needs 3 days time; (2) radioactive contamination is arranged; (3) more outstanding is to be not suitable for high throughput testing, once only can make the sample about 12; (4) result is sxemiquantitative, and is inaccurate.
2. the detection of analyzing based on reporter gene: as luciferase reporter gene and beta galactosidase reporter gene etc.Its ultimate principle is to be to be structured in after the promoter that contains transcription factor homolog sequence to be detected with luciferase reporter gene or beta galactosidase reporter gene people, and then this promoter is structured on the expression plasmid, after utilizing the method transfectional cell of gene transfection, by the activity of examining report expression of gene situation indirect reaction transcription factor.This method has sensitivity, is fit to the advantage of high throughput testing, but exists following deficiency: (1) is subject to the interference of other factors: other transcription factors that exist on the cell often influence the expression of transcription factor to be checked; (2) this method success or not simultaneously is also with the influence just of reporter gene plasmid transfection efficient; (3) quantitative error is too big as a result.
3. Western blot (Western blot): the same with conventional Western blot method, the expression that utilizes corresponding antibodies to detect transcription factor protein reacts the variation of its activity.This method has responsive and the objective advantage of result, but exists following deficiency: expend time in (1), generally needs 2～3 days; (2) uncomfortable cooperation high throughput testing; (3) result quantitatively is sxemiquantitative, and is inaccurate.
(3), summary of the invention
Purpose of the present invention just provides a kind of method that detects the nuclear factor activity in the enzyme linked immunological mode, this method can be carried out the active detection of high-throughout nuclear factor in a short period of time, and "dead" pollution has characteristics such as highly sensitive, quantitatively accurate.
The objective of the invention is to realize that by such technical scheme its step is as follows:
(1) synthetic two single stranded DNA sequences with corresponding transcription factor specific bond then, are annealed, renaturation, and formation dna double chain carries out quantitatively with the detection of nucleic acids instrument again, and vacuum drying under 4 ℃ of conditions;
(2) utilize nucleic acid adhesive liquor, above-mentioned double-stranded DNA is made into 5～20pmol/ μ l concentration, add then in the plate hole of enzyme carrier bar, every hole 100～200 μ l, behind the room temperature reaction 1～2 hour, coating buffer is poured out, with the washing of PBS damping fluid, unconjugated double-stranded DNA and adhesive liquor are fully washed away, dry standby;
(3) every hole adds 50～100 μ l, content is that 2～20 μ g cell or tissues extract albumen, under 37 ℃ of conditions, reacts 1 hour, outwells liquid, with the washing of PBS damping fluid, unconjugated albumen is fully washed away;
(4) will be diluted to concentration at the monoclonal anti body and function antibody diluent of corresponding transcription factor is 1: 1000～2000, and every then hole adds 100～200 μ l, under 37 ℃ of conditions, reacted 1 hour, outwell liquid,, unconjugated antibody is washed away with the washing of PBS damping fluid;
(5) the IgG antibody of HRP mark being diluted to concentration with antibody diluent is 1: 1000～2000, and every then hole adds 100～200 μ l, under 37 ℃ of conditions, react 1 hour, outwells liquid, washs with the PBS damping fluid, and unconjugated antibody is washed away;
(6) every hole adds 100～200 μ l colour developing liquid, under 37 ℃ of conditions, reacts 2～20 minutes;
(7) every hole adds 100 μ l reaction terminating liquids;
(8) being determined at wavelength with enzyme-linked immunosorbent assay instrument is 450nm or 490nm, and the absorbance during reference wavelength 655nm generally requires to have surveyed in 5 minutes.
Specific as follows in the desired technical scheme of this patent:
(1) in the step, be that its single stranded DNA sequence is a known array with synthetic two the single stranded DNA sequences with corresponding transcription factor specific bond of nucleic acid synthesizer, because of the nuclear factor that detects different; Add that methods such as annealing, renaturation all are methods of biological technical field maturation, can finish, also can finish by commercialization company in own laboratory;
(2) step is a core content of the present invention, mainly be to utilize nucleic acid adhesive liquor that double-stranded DNA is fixed on the elisa plate, nucleic acid adhesive liquor is that a kind of special DNA frosting bag is by reagent, commercialization at present, PIERCE company by the U.S. produces, can buy from corresponding agency during use, also can oneself prepare, concrete compound method is seen relevant references;
(3) in the step, relating to cell or tissue and extract albumen, is the protein extract of tissue to be detected or cell, and its extracting method is a biological technical field maturation method commonly used; The PBS damping fluid is a routine biochemistry reagent, can prepare with reference to relevant reagent instructions;
(4), (5) step in, the antibody diluent that relates to is a routine biochemistry reagent, can prepare with reference to relevant reagent instructions;
(6) step and (7) are in the step, and the colour developing liquid and the stop buffer that relate to are routine biochemistry reagent, can prepare with reference to relevant reagent instructions;
(3)-(7) detection step is the conventional related step of enzyme-linked immune detection method;
(8) in, the wavelength that detection is selected for use is 450nm or 490nm, reference wavelength 655nm, it is enzyme-linked immune detection method requirement routinely, specifically be because in the scheme that patent requires (5) step be IgG antibody with the HRP mark, through after the colour developing of colour developing liquid, in above-mentioned wavelength coverage, detect the most responsive later on; By detecting the size of absorbance, the size that reflects corresponding tested nuclear factor activity, concrete principle is: because the size of nuclear factor activity to be detected is mainly reacted with the binding ability size of corresponding distinguished sequence by detecting corresponding nuclear factor, the scheme that this patent requires is utilized this principle just, at first be coated in the enzyme linked plate holes with the dna sequence dna of nucleic acid adhesive liquor with corresponding transcription factor specific bond, add the protein sample that contains corresponding transcription factor then, after reaction, transcription factor just can combine with the dna sequence dna of bag quilt, in after add the monoclonal antibody of corresponding transcription factor again, after reaction, monoclonal antibody can with corresponding transcription factor specific bond, form the compound of monoclonal antibody-transcription factor-DNA distinguished sequence combination, add again can be with the HRP mark of monoclonal antibody specific bond two anti-, utilize microplate reader to detect absorbance after utilizing the chromogenic reagent reaction, absorbance is big more, it is just many more to show that transcription factor combines with the corresponding DNA sequence, and it is active just big more equally.
Owing to adopted technique scheme, the present invention to have following advantage:
1.DNA bag do not needed special pre-activating reagent and special frosting (common laboratory use frosting get final product);
2. bag is saved time: generally only need 1 hour, and other method for coating need about 12 hours at least;
3. testing process is easy, need not special instrument and equipment, saves time, and only needs about 4 hours;
4. be fit to do high throughput testing: once can make 96 samples, also can enlarge the sample number of detection as required,, be particularly suitable for doing the large-scale screening of medicine as 192 samples etc.;
5. "dead" pollution;
6. highly sensitive: can detect 0.5 μ g～50 μ g protein samples, its sensitivity is approximately about 10 times of EMSA method;
7. quantitatively accurately: can carry out direct quantitative to the result, disturbing factor is few;
(4), embodiment
The invention will be further described below in conjunction with drawings and Examples:
Step of the present invention is as follows:
(1) utilize synthetic two the single stranded DNA sequences with corresponding transcription factor specific bond of nucleic acid synthesizer, then, anneal, renaturation, formation dna double chain carries out quantitatively with the detection of nucleic acids instrument again, and vacuum drying under 4 ℃ of conditions;
(2) utilize nucleic acid adhesive liquor, above-mentioned double-stranded DNA is made into 5～20pmol/ μ l concentration, add then in the plate hole of enzyme carrier bar, every hole 100～200 μ l, behind the room temperature reaction 1～2 hour, coating buffer is poured out, with the washing of PBS damping fluid, unconjugated double-stranded DNA and adhesive liquor are fully washed away, dry standby;
(3) every hole adds 50～100 μ l, content is that 2～20 μ g cell or tissues extract albumen, under 37 ℃ of conditions, reacts 1 hour, outwells liquid, with the washing of PBS damping fluid, unconjugated albumen is fully washed away;
(4) will be diluted to concentration at the monoclonal anti body and function antibody diluent of corresponding transcription factor is 1: 1000～2000, and every then hole adds 100～200 μ l, under 37 ℃ of conditions, reacted 1 hour, outwell liquid,, unconjugated antibody is washed away with the washing of PBS damping fluid;
(5) the IgG antibody of HRP mark being diluted to concentration with antibody diluent is 1: 1000～2000, and every then hole adds 100～200 μ l, under 37 ℃ of conditions, react 1 hour, outwells liquid, washs with the PBS damping fluid, and unconjugated antibody is washed away;
(6) every hole adds 100～200 μ l colour developing liquid, under 37 ℃ of conditions, reacts 2～20 minutes;
(7) every hole adds 100 μ l reaction terminating liquids;
(8) being determined at wavelength with enzyme chain immune detection instrument is 450nm or 490nm, and the absorbance during reference wavelength 655nm generally requires to have surveyed in 5 minutes.
The aforesaid nucleic acid adhesive liquor of utilizing can be made into 10pmol/ μ l concentration with above-mentioned (2) double center chain DNA, adds then in the plate hole of enzyme carrier bar, every hole 100 μ l, room temperature reaction 1 hour is poured out coating buffer, with PBS damping fluid washing 3 times, washed 3 minutes at every turn.
Claims (2)
1. one kind is detected the method for nuclear factor activity in the enzyme linked immunological mode, and its step is as follows:
(1) synthetic two single stranded DNA sequences with corresponding transcription factor specific bond then, are annealed, renaturation, and formation dna double chain carries out quantitatively with the detection of nucleic acids instrument again, and vacuum drying under 4 ℃ of conditions;
(2) utilize nucleic acid adhesive liquor, above-mentioned double-stranded DNA is made into 5～20pmol/ μ l concentration, add then in the plate hole of elisa plate, every hole 100～200 μ l, behind the room temperature reaction 1～2 hour, coating buffer is poured out, with the washing of PBS damping fluid, unconjugated double-stranded DNA and adhesive liquor are fully washed away, dry standby;
(3) every hole adds 50～100 μ l, content is that 2～20 μ g cell or tissues extract albumen, under 37 ℃ of conditions, reacts 1 hour, outwells liquid, with the washing of PBS damping fluid, unconjugated albumen is fully washed away;
(4) will be diluted to concentration at the monoclonal anti body and function antibody diluent of corresponding transcription factor is 1: 1000～2000, and every then hole adds 100～200 μ l, under 37 ℃ of conditions, reacted 1 hour, outwell liquid,, unconjugated antibody is washed away with the washing of PBS damping fluid;
(5) the IgG antibody of HRP (horseradish peroxide (change) thing enzyme) mark being diluted to concentration with antibody diluent is 1: 1000～2000, and every then hole adds 100～200 μ l, under 37 ℃ of conditions, reacted 1 hour, outwell liquid,, unconjugated antibody is washed away with the washing of PBS damping fluid;
(6) every hole adds 100～200 μ l colour developing liquid, under 37 ℃ of conditions, reacts 2～20 minutes;
(7) every hole adds 100 μ l reaction terminating liquids;
(8) being determined at wavelength with enzyme chain immune detection instrument is 450nm or 490nm, and the absorbance during reference wavelength 655nm generally requires to have surveyed in 5 minutes.
2. the method that detects the nuclear factor activity in the enzyme linked immunological mode as claimed in claim 1, it is characterized in that: utilize nucleic acid adhesive liquor, above-mentioned (2) double center chain DNA is made into 10pmol/ μ l concentration, add then in the plate hole of elisa plate, every hole 100 μ l, room temperature reaction 1 hour is poured out coating buffer, with PBS damping fluid washing 3 times, washed 3 minutes at every turn.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB031354009A CN1182396C (en) | 2003-07-09 | 2003-07-09 | Method for detecting activity of nuclear trascription factor by using enzyme-linked immune mode |
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| CNB031354009A CN1182396C (en) | 2003-07-09 | 2003-07-09 | Method for detecting activity of nuclear trascription factor by using enzyme-linked immune mode |
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| CN1477399A true CN1477399A (en) | 2004-02-25 |
| CN1182396C CN1182396C (en) | 2004-12-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101101292B (en) * | 2007-05-11 | 2011-05-18 | 中国人民解放军第三军医大学第一附属医院 | Biological molecule high flux quantitative detection method |
| CN110779967A (en) * | 2019-09-18 | 2020-02-11 | 南京农业大学 | An electrochemical detection method of NF-κB based on traditional glassy carbon electrode |
-
2003
- 2003-07-09 CN CNB031354009A patent/CN1182396C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101101292B (en) * | 2007-05-11 | 2011-05-18 | 中国人民解放军第三军医大学第一附属医院 | Biological molecule high flux quantitative detection method |
| CN110779967A (en) * | 2019-09-18 | 2020-02-11 | 南京农业大学 | An electrochemical detection method of NF-κB based on traditional glassy carbon electrode |
| CN110779967B (en) * | 2019-09-18 | 2022-06-17 | 南京农业大学 | NF-kB electrochemical detection method based on traditional glassy carbon electrode |
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| CN1182396C (en) | 2004-12-29 |
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