CN1766615A - Liquichip for parallel detection of colorectal cancer protein marker, preparation and application thereof - Google Patents
Liquichip for parallel detection of colorectal cancer protein marker, preparation and application thereof Download PDFInfo
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Abstract
The invention discloses a colon cancer protein mark parallel test liquid phase chip, which is mainly formed by: micro ball, capture antibody, test antibody and streptomycin-phycoerythrin, wherein the capture antibody with the corresponding micro balls form coupling conjugated, which uses red laser to active the red categorizing fluorescence of the sphere base material and ascertains the type by the different color of the sphere base material; the test antibody is a skin factor mark antibody; the capture antibody and the test antibody can combine with the colon cancer protein mark; the test antibody combines with the streptomycin-phycoerythrin and uses green laser to active the phycoerythrin to measure the report fluorescence molecular number of the sphere base material, which can indirect ascertain the colon cancer protein mark content combines with the sphere base material. The invention also discloses the colon cancer protein mark parallel test liquid phase chip applied in preparing the test agent.
Description
Technical field
The present invention relates to a kind of liquid-phase chip and preparation method thereof and application, relates in particular to a kind of liquichip for parallel detection of colorectal cancer protein marker and preparation method thereof and application, belongs to immunological technique and clinical detection technique field.
Background technology
The annual morbidity of whole world colorectal cancer new case number reaches 940,000, has every year nearly 500,000 people to die from colorectal cancer.Colorectal cancer death occupies the 3rd of the cancer cause of the death.Colorectal cancer also is one of modal malignant tumour in China, occupies the 4th of the malignant tumour incidence of disease at present.Improve the survival rate and the quality of life of colorectal cancer patients, early detection, early diagnosis and early treatment are crucial.
The main method that is used for colorectal cancer early detection and diagnosis at present is that fiberendoscopy, fecal occult blood, digital rectal examination combine with proctoscope, does not also have a kind of good AT early diagnosis and blood diagnosis index and method.
It is clinical detection method commonly used that the ELISA method detects tumor marker, but it can only detect a tumor markers at every turn, and the sensitivity and the specificity of any single markers in diagnosis are not very desirable; Therefore, exploitation and to use joint-detection be the problem that reality presses for solution with the sensitivity that improves diagnosis of colorectal carcinoma and specificity and positive predictive value.
Compare with technology in the past, the biochip technology of current development can be realized the purpose of the disposable joint-detection of tumor markers of colorectal cancer, the liquid-phase chip technology that produces is a kind of of biochip at present, it is except can detecting multiple label simultaneously, also have than ELISA and react liquid phase reactor characteristics more fully, and it is time saving and energy saving to have, high specificity, highly sensitive, and AT advantage.Therefore, developing and develop a kind of liquichip for parallel detection of colorectal cancer protein marker is the essential of present clinical diagnosis.
Summary of the invention
Detect at existing tumor marker ELISA, once can only detect the inconvenience of technology of a label and the needs of clinical diagnosis, the problem to be solved in the present invention provides a kind of liquichip for parallel detection of colorectal cancer protein marker and preparation method thereof and application, for early detection, early diagnosis and the early treatment of colorectal cancer provides a kind of AT, easily, clinical detection method and detection kit accurately.
Mentality of designing of the present invention is: the tumor markers of selecting colorectal cancer, preparation is at the antibody of the different epitopes of every kind of tumor markers, respectively with not homochromy number microballoon coupling, prepare the liquid-phase chip that can carry out disposable parallel detection to above-mentioned label, when using, add serum to be checked, make colorectal cancer tumor marker in the serum by the antibody capture on the microballoon, anti-hatch jointly with biotin labeled two again, react with Streptavidin-phycoerythrin (SA-PA) then, by the Luminex100 detection system, realize the disposable detection by quantitative of above-mentioned label.
Below liquichip for parallel detection of colorectal cancer protein marker of the present invention is described in detail:
Tumor markers involved in the present invention is on the basis of reference lot of documents, and truly has with the having of knot, the carcinoma of the rectum through experiment confirm repeatedly and to select after the substantial connection.
For example: 59.6% colorectal cancer patients S-CEA (carcinoembryonic antigen, CEA) level raises; Carbohydrate antigen 242 in colorectal cancer patients (carbohydrate antigen242, positive rate CA242) has reached 73.2%; 76.6% patient's prolactin (prolactin, PRL) level increase are arranged; The detection sensitivity of alexin α 6 (Defensin α 6) is 69.4%, specificity is 83.3%, positive predictive value is 91.9%; (Colon cancer secreted protein-2, CCSP-2) expression is increased 78 times to Colon cancer secreted protein-2 in II, III, IV phase colon cancer, adenocarcinoma of colon and colon carcinoma cell line.
Given this, the present invention has determined 7 kinds of oncoprotein labels that are used for the colorectal cancer diagnosis, they are: carcinomebryonic antigen (carcinoembryonic antigen, CEA), CA19-9 (carbohydrate antigen 19-9, CA19-9), carbohydrate antigen 72-4 (carbohydrate antigen72-4, CA72-4), carbohydrate antigen 242 (carbohydrate antigen242, CA242), prolactin (prolactin, PRL), alexin α 6 (Defensin α 6), Colon cancer secreted protein-2 (Colon cancer secreted protein-2, CCSP-2); And utilize described antigen preparation or selected its corresponding antibody, they are respectively: CEA antibody, CA19-9 antibody, CA72-4 antibody, CA242 antibody, PRL antibody, alexin α 6 antibody, CCSP-2 antibody.
The liquichip for parallel detection of colorectal cancer protein marker that the present invention relates to, mainly by microballoon, capture antibody detects antibody, and Streptavidin-phycoerythrin is formed, and it is characterized in that described microballoon is 26,36, and 46,56,66,76, No. 86 microballoons; Described capture antibody is the CEA capture antibody, the capture antibody of CA19-9, the capture antibody of CA242, the capture antibody of CA72-4, the capture antibody of PRL, alexin α 6 capture antibodies, CCSP-2 capture antibody; Described detection antibody is activated biotin labeled antibody; The all special its corresponding colorectal cancer protein marker of the energy combinations of described capture antibody and detection antibody;
Wherein: described CEA capture antibody and No. 26 microballoons form couplet, CA19-9 capture antibody and No. 36 microballoons form couplet, CA72-4 capture antibody and No. 46 microballoons form couplet, CA242 catches with No. 56 microballoons and forms couplet, PRL catches with No. 66 microballoons and forms couplet, and alexin α 6 capture antibodies and No. 76 microballoons form couplet; CCSP-2 capture antibody and No. 86 microballoons form couplets, excite redness classification fluorescence on its sphere matrix with red laser, determine types according to the color of its sphere matrix is different; Described detection antibody combines with Streptavidin-phycoerythrin, excites phycoerythrin with green laser, measures the quantity of the report fluorescence molecule of combination on the sphere matrix, is used for determining indirectly the content of the colorectal cancer protein marker of combination on the sphere matrix.
In above-mentioned liquichip for parallel detection of colorectal cancer protein marker, described capture antibody is respectively: Mab cloneM111147 (10-C10), Mab clone M8073021 (10c04), MAb clone #CA72-4L (10-c004), clone242II, MAb clone#M94194 (10-P15), n3378-08K:NP-6 Pab anti-Hu E B, the antibody of CCSP-2.
In above-mentioned liquichip for parallel detection of colorectal cancer protein marker, described detection antibody is respectively: MAbmouse anti-IgGl clone#M111146 (10-c10), Mab clone M8073021 (10-c04), clone#CA72-4M, MAb-c004-10mouse anti-IgGl, clone 242 IgG, MAb mouse anti-IgGlclone#M94193 (10-P15), N53378-08D:NP-6 Pab rabbit-anti-Hu E B, the antibody of CCSP-2.
Detecting antibody is the another kind of antibody that is used to discern tumor marker, its effect is the tumor marker and the coupling of detection fluorescence with the liquid-phase chip combination, indirectly with the concentration of the label of combination with detect intensity of fluorescence and combine, thereby realize the concentration of every kind of label is carried out quantitative measurement.Detect antibody and combine with avidin-R-PE, by the Luminex100 detection system oncoprotein label in each is carried out qualitative and quantitative detection at last by biotin.
The preparation method of liquichip for parallel detection of colorectal cancer protein marker of the present invention the steps include:
(1) capture antibody and microballoon coupling form couplet
Choose the carboxyl microballoon respectively 26,36,46,56,66,76, No. 86, washing; The activated carboxyl microballoon; Respectively corresponding 26,36,46,56,66,76, No. 86 carboxyl microballoons add the CEA capture antibody, the capture antibody of CA19-9, the capture antibody of CA242, the capture antibody of CA72-4, the capture antibody of PRL, alexin α 6 capture antibodies, CCSP-2 capture antibody in proper order; Mixing; Under the room temperature, be placed on the rotating speed of 200～250rpm and hatch 30～120 minutes on the shaking table; Repeat 1～2 time; With PBS-TBN washing 2～3 times; Get the couplet of CEA capture antibody and No. 26 microballoons, the couplet of CA19-9 capture antibody and No. 36 microballoons, the couplet of CA72-4 capture antibody and No. 46 microballoons, CA242 catches the couplet with No. 56 microballoons, PRL catches the couplet with No. 66 microballoons, the couplet of alexin α 6 capture antibodies and No. 76 microballoons; The couplet of CCSP-2 capture antibody and No. 86 microballoons; Count the unit bodies product of every kind of microballoon couplet, determine concentration, respectively at keeping in Dark Place under 4 ℃ of conditions; During use, select to mix according to test item;
(2) coupling of detection antibody and biotin
To activate biotin is dissolved in the dimethyl sulfoxide (DMSO) by concentration 1mg/ml; To treat that in addition coupling and purified detection antibody are dissolved in the sodium bicarbonate solution of 0.1mol/L pH9.0 by concentration 1mg/ml respectively; Mix by 1: 8 volume ratio respectively with the detection antibody-solutions for the treatment of coupling with above-mentioned activation biotin liquid, at room temperature incubation is 4～5 hours; Finish the coupling that detects antibody and biotin.
The application of liquichip for parallel detection of colorectal cancer protein marker of the present invention in the preparation clinical detection reagent.
With the sphere matrix that is marked with probe is the couplet of capture antibody and microballoon coupling, the biotin labeled detection antibody that reporter molecules promptly activates, Streptavidin-phycoerythrin and sample mix, leave standstill a period of time, probe can with the combining of corresponding target molecular specificity, the reporter molecules that has green report fluorescence also combines with molecules of interest is specific, with sample on the potpourri to Luminex 100, adopt microfluidic technology that the microballoon couplet is divided into individual cells stream, utilize red, green two bundle laser detection obtain light signal, deal with data just can finish to biological respinse in real time, quantitative test.
Utilize liquichip for parallel detection of colorectal cancer protein marker of the present invention, can be by the parallel detection and the comprehensive evaluation of kinds of tumors label, set up a kind of mathematical model, can obviously improve the sensitivity and the specificity of colorectal cancer diagnosis, the sensitivity of estimating the diagnosis colorectal cancer can reach 90%, specificity can reach 85%, and positive predictive value can reach 95%.
Method of the present invention not only can improve the sensitivity and the specificity of diagnosis, and, owing to being placed in the reaction system, a plurality of labels carry out, different probes can carry out combination with different molecules of interest, the reaction back can be distinguished different detection reaction by laser for detecting color numbers of sphere matrix, thereby more time saving and energy saving, saved the detection cost simultaneously.
Embodiment
Embodiment 1: the coupling of the microballoon of capture antibody and known numbering
1. choose 26,36,46,56,66,76, No. 86 carboxyl microballoons (Luminex company) respectively,, 20 seconds time, microballoon is mixed with whirlpool oscillator vibration microballoon suspension.
2. get above-mentioned each number carboxyl microballoon about 2 * 10 respectively
3Individual, transfer in the centrifuge tube the centrifugal 2min of 〉=8000 * g, precipitation carboxyl microballoon respectively.
3. remove supernatant, add 100 μ l dH
2O, with 20 seconds resuspended microballoons of whirlpool oscillator vibration, the centrifugal 2min of 〉=8000 * g, precipitation carboxyl microballoon.
4. remove supernatant, add the biphosphate sodium salt solution of 80 μ l, 100mM, pH=6.2, with the carboxyl microballoon of whirlpool oscillator vibration resuspended washing in 20 seconds.
5. the Sulfo-NHS that adds 10 μ l, 50mg/ml (uses dH
2The O dilution), with the vibration gently of whirlpool oscillator.
6. the EDC that adds 10 μ l, 50mg/ml (uses dH
2The O dilution), with the vibration gently of whirlpool oscillator.Incubated at room 20min gently shook once with the whirlpool oscillator every 10 minutes.The centrifugal 2min of 〉=8000 * g, the carboxyl microballoon of precipitation activation.
7. remove supernatant, add the MES of 250 μ l, 50mM, pH=5.0, whirlpool oscillator vibration 20 seconds, the carboxyl microballoon of resuspended activation.The centrifugal 2min of 〉=8000 * g, the carboxyl microballoon after the washing of precipitate.
8. repeating step is 7 twice, with the MES washing of 50mM, pH=5.0 2 times.
9. the MES that adds 100 μ l, 50mM, pH=5.0 was with whirlpool oscillator vibration 20 seconds.Adding 1 μ g capture antibody in the microballoon of mixing respectively (is respectively: Mab clone M111147 (10-C10), Mab cloneM8073021 (10c04), MAb clone #CA72-4L (10-c004), clone 242II, MAbclone#M94194 (10-P15), n3378-08K:NP-6 Pab anti-Hu E B, CCSP-2 antibody), MES with 50mM, pH=5.0 is settled to 500 μ l, with whirlpool oscillator mixing.
10. at room temperature being placed on the shaking table (200rpm) hatched 2 hours.The centrifugal 2min of 〉=8000 * g, the good microballoon of precipitation coupling.
11. remove supernatant, add 300 μ l PBS-TBN, whirlpool oscillator vibration 30 seconds.At room temperature be placed on the shaking table (200rpm) and hatched 30 minutes.The centrifugal 2min of 〉=8000 * g, the good microballoon of precipitation coupling.
12. remove supernatant, add 1ml PBS-TBN, whirlpool oscillator vibration 30 seconds.The centrifugal 2min of 〉=8000 * g, the good microballoon of precipitation coupling.
13. repeating step 12 once, with PBS-TBN washing 2 times.
14. add 500 μ l PBS-TBN, the microballoon that resuspended coupling is good and washing is good, promptly get the couplet of CEA capture antibody and No. 26 microballoons, the couplet of CA19-9 capture antibody and No. 36 microballoons, the couplet of CA72-4 capture antibody and No. 46 microballoons, CA242 catches the couplet with No. 56 microballoons, and PRL catches the couplet with No. 66 microballoons, the couplet of alexin α 6 capture antibodies and No. 76 microballoons; The couplet of CCSP-2 capture antibody and No. 86 microballoons.
15., converse the concentration of every kind of microballoon with the quantity of cell counter counting microballoon.
Keep in Dark Place 16. the good microballoon of coupling is placed on 4 ℃, the microballoon of general every kind of antibody coupling is preserved separately, during use, selects to mix according to test item.
Embodiment 2: detect the coupling of antibody and biotin
1. will activate biotin (Sigma company) is dissolved in the dimethyl sulfoxide (DMSO) by concentration 1mg/ml.
2. will treat that the purified detection antibody of coupling (is respectively: MAb mouse anti-IgGlclone#M111146 (10-c10), Mab clone M8073021 (10-c04), clone #CA72-4M, MAb-c004-10 mouse anti-IgGl, clone 242 IgG, MAb mouse anti-IgGl clone#M94193 (10-P15), N53378-08D:NP-6 Pab rabbit-anti-Hu E B, the antibody of CCSP-2) be dissolved in the sodium bicarbonate solution of 0.1mol/LpH9.0 by concentration 1mg/ml respectively.
3. will activate biotin liquid and mix by 1: 8 volume ratio respectively, at room temperature incubation 4h with the antibody-solutions for the treatment of coupling.
4.4 under ℃ condition, at 0.05mol/L, the PBS of the pH7.2 24h that dialyses wherein changes liquid 4 times, to remove unconjugated free biotin.
5. add 0.02%NaN3 in the antibody-solutions that is combined with biotin, packing is respectively kept in Dark Place at 4 ℃, during use, selects to mix according to test item.
Embodiment 3: the application of liquichip for parallel detection of colorectal cancer protein marker of the present invention in clinical detection
(1) utilize liquichip for parallel detection of colorectal cancer protein marker of the present invention to detect the techniqueflow of protide tumor markers:
1. take out respectively above-mentioned preparation at each 500 of the capture antibody coupling microballoons of every kind of tumor markers, mix by equal proportion, be divided in 96 orifice plates, contain each 500 of various capture antibody coupling microballoons in each hole, add serum 50 μ l to be checked, hatched 2 hours for 37 ℃.
2. 〉=and the centrifugal 2min of 8000 * g, remove supernatant, add 300 μ l, 1%PBS-BSA, whirlpool oscillator vibration 30 seconds, 37 ℃ of incubators sealed 1 hour.
3. 〉=the centrifugal 2min of 8000 * g.Remove supernatant, add 300 μ l PBS-TBN, whirlpool oscillator vibration 30 seconds.The centrifugal 2min of 〉=8000 * g.
4. repeating step is 3 twice.
5. the biotin labeled detection antibody 100 μ l that add above-mentioned preparation, wherein said various detection antibody mix by equal proportion in advance, shake up, and 37 ℃ of incubators were hatched 30 minutes.
6. 〉=and the centrifugal 2min of 8000 * g, remove supernatant, add 300 μ l PBS-TBN, whirlpool oscillator vibration 30 seconds.The centrifugal 2min of 〉=8000 * g.
7. repeating step is 6 twice.
8. add Streptavidin-phycoerythrin (SA-PE) 100 μ l, shake up, 37 ℃ of incubators were hatched 30 fens.
9. 〉=and the centrifugal 2min of 8000 * g, remove supernatant, add 300 μ l PBS-TBN, whirlpool oscillator vibration 30 seconds.The centrifugal 2min of 〉=8000 * g.
10. repeating step is 9 twice.Add the resuspended microballoon of 100 μ l PBS-TBN, be used for Luminex100 and detect.
11.Luminex100 in detecting, the kind of red fluorescence definition microballoon, green fluorescence is measured the average fluorescent strength of SA-PE, according to typical curve, determines the tumor marker substrate concentration of testing sample.
(2) typical curve of oncoprotein label is drawn
Respectively according to the serology range of concentrations of various tumor markers, be equipped with the standard items of 7 kinds of tumor markers, each standard items is established 6 dilutabilitys, equal proportion is mixed then, making final concentration separately is required concentration, every hole 50 μ l, the step of reactions steps and testing sample is identical, according to measurement result, the typical curve of the various oncoprotein labels of equation model that utilization Luminex100 instrumental analysis system provides, according to typical curve, detection system analyzes the detectable concentration of each testing sample automatically, realizes the disposable quantitative test to 7 kinds of tumor markers.
The result shows: 7 kinds of tumor markers just can be detected simultaneously in hole of liquichip for parallel detection of colorectal cancer protein marker of the present invention, and the efficient of more traditional ELISA has improved 7 times.
Claims (5)
1. liquichip for parallel detection of colorectal cancer protein marker, mainly by microballoon, capture antibody detects antibody, and Streptavidin-phycoerythrin is formed, and it is characterized in that described microballoon is 26,36, and 46,56,66,76, No. 86 microballoons; Described capture antibody is the CEA capture antibody, the capture antibody of CA19-9, the capture antibody of CA242, the capture antibody of CA72-4, the capture antibody of PRL, alexin α 6 capture antibodies, CCSP-2 capture antibody; Described detection antibody is activated biotin labeled antibody; The all special its corresponding colorectal cancer protein marker of the energy combinations of described capture antibody and detection antibody;
Wherein: described CEA capture antibody and No. 26 microballoons form couplet, CA19-9 capture antibody and No. 36 microballoons form couplet, CA72-4 capture antibody and No. 46 microballoons form couplet, CA242 catches with No. 56 microballoons and forms couplet, PRL catches with No. 66 microballoons and forms couplet, and alexin α 6 capture antibodies and No. 76 microballoons form couplet; CCSP-2 capture antibody and No. 86 microballoons form couplets, excite redness classification fluorescence on its sphere matrix with red laser, determine types according to the color of its sphere matrix is different; Described detection antibody combines with Streptavidin-phycoerythrin, excites phycoerythrin with green laser, measures the quantity of the report fluorescence molecule of combination on the sphere matrix, is used for determining indirectly the content of the colorectal cancer protein marker of combination on the sphere matrix.
2. liquichip for parallel detection of colorectal cancer protein marker as claimed in claim 1, it is characterized in that, described capture antibody is respectively: Mab clone M111147 (10-C10), Mab clone M8073021 (10c04), MAb clone#CA72-4L (10-c004), clone 242 II, MAb clone#M94194 (10-P15), n3378-08K:NP-6 Pabanti-Hu E B, the antibody of CCSP-2.
3. liquichip for parallel detection of colorectal cancer protein marker as claimed in claim 1, it is characterized in that, described detection antibody is respectively: MAb mouse anti-IgG1 clone#M111146 (10-c10), Mab clone M8073021 (10-c04), clone#CA72-4M, MAb-c004-10 mouse anti-IgG1, clone 242 IgG, MAb mouseanti-IgG1 clone#M94193 (10-P15), N53378-08D:NP-6 Pab rabbit-anti-Hu E B, the antibody of CCSP-2.
4. the preparation method of the described liquichip for parallel detection of colorectal cancer protein marker of claim 1 is characterized in that:
(1) capture antibody and microballoon coupling form couplet
Choose the carboxyl microballoon respectively 26,36,46,56,66,76, No. 86, washing; The activated carboxyl microballoon; Respectively corresponding 26,36,46,56,66,76, No. 86 carboxyl microballoons add the CEA capture antibody, the capture antibody of CA19-9, the capture antibody of CA242, the capture antibody of CA72-4, the capture antibody of PRL, alexin α 6 capture antibodies, CCSP-2 capture antibody in proper order; Mixing; Under the room temperature, be placed on the rotating speed of 200～250rpm and hatch 30～120 minutes on the shaking table; Repeat 1～2 time; With PBS-TBN washing 2～3 times; Get the couplet of CEA capture antibody and No. 26 microballoons, the couplet of CA19-9 capture antibody and No. 36 microballoons, the couplet of CA72-4 capture antibody and No. 46 microballoons, GA242 catches the couplet with No. 56 microballoons, PRL catches the couplet with No. 66 microballoons, the couplet of alexin α 6 capture antibodies and No. 76 microballoons; The couplet of CCSP-2 capture antibody and No. 86 microballoons; Count the unit bodies product of every kind of microballoon couplet, determine concentration, respectively at keeping in Dark Place under 4 ℃ of conditions; During use, select to mix according to test item;
(2) coupling of detection antibody and biotin
To activate biotin is dissolved in the dimethyl sulfoxide (DMSO) by concentration 1mg/ml; To treat that in addition coupling and purified detection antibody are dissolved in the sodium bicarbonate solution of 0.1mol/L pH9.0 by concentration 1mg/ml respectively; Mix by 1: 8 volume ratio respectively with the detection antibody-solutions for the treatment of coupling with above-mentioned activation biotin liquid, at room temperature incubation is 4～5 hours; Finish the coupling that detects antibody and biotin.
5. the application of the described liquichip for parallel detection of colorectal cancer protein marker of claim 1 in the preparation clinical detection reagent.
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2005
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