CN105092845A - Pancreatic cancer protein biomarker and application and detection chip thereof, and detection device - Google Patents
Pancreatic cancer protein biomarker and application and detection chip thereof, and detection device Download PDFInfo
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Abstract
The invention provides a pancreatic cancer protein biomarker and an application thereof, wherein the marker comprises CRP, ICAM-1, OPG and CA19-9 which stably exist in human serum/plasma and can be detected. The pancreatic cancer protein biomarker is obtained through screening in a way of low abundance difference research, and validation indicates that the biomarker participates in generation and development processes of pancreatic cancer, is a believable pancreatic cancer early biomarker, and has higher specificity and sensitivity compared with conventional detection markers. on the basis, the invention further provides a detection chip aiming at the pancreatic cancer protein biomarker and a detection device including the same; according to the detection chip, a specific CRP monoclonal antibody, a specific ICAM-1 monoclonal antibody, a specific OPG monoclonal antibody and a specific CA19-9 respectively prepared through immunization of the CRP, ICAM-1, OPG and CA19-9 are used as the basis and are fixed on a solid-phase matrix to form the chip; through antigen-antibody specific combination, biomarking proteins are detected, and higher accuracy and specificity are achieved.
Description
Technical field
The invention belongs to technical field of biological, be specifically related to a kind of cancer of pancreas protein biomarkers thing, purposes and detection chip thereof and pick-up unit.
Background technology
Cancer of pancreas is that a kind of grade malignancy is very high, the malignant tumor of digestive tract that Diagnosis and Treat is all very difficult, and about 90% for originating from the duct adenocarcinoma of glandular tube epithelium.Patient after usual morbidity, 5 years survival rate <1% are one of the poorest malignant tumours of prognosis.
Cause the so low major reason of cancer of pancreas prognosis survival rate to be cancer of pancreas in early days without any symptom, be difficult in cancer of pancreas invasioning delitescence or initial stage detected discovery, thus affect best treatment time adversely.Mainly being difficult to detected discovery is because at the initial stage of a disease without any symptom, and when best CA19-9, CEA, CA242 cancer of pancreas certification mark thing of the detection degree of accuracy that can adopt at present detects, has certain positive rate, and do not possess high specific.According to statistics display, adopt above-mentioned label to detect (before canceration) susceptibility in cancer of pancreas incubation period lower, as premorbid 1 year, have the susceptibility of 68%, morbidity the first two years, susceptibility was 53%.And adopt other standard clinical techniques to detect, as being in cancer middle and advanced stage when B ultrasonic, CT, MRI, ERCP, PTCD, angiogram, laparoscope etc. are checked through and find canceration, greatly delay Diagnosis and Treat.
Summary of the invention
Object of the invention process is the above-mentioned deficiency overcoming prior art, provides one can accuracy and specificity better cancer of pancreas protein biomarkers thing, purposes and detection chip thereof and pick-up unit.
In order to realize foregoing invention object, the technical scheme of the embodiment of the present invention is as follows:
A kind of cancer of pancreas protein biomarkers thing, is included in stable existence in human serum/blood plasma and detectable CRP, ICAM-1, OPG and CA19-9.
Above-mentioned cancer of pancreas protein biomarkers thing of the present invention is screened by the mode of " minusing " and obtains, and namely with normal sample in contrast, from canceration sample, deducts holoprotein in normal sample, and the part had more is modulability albumen specific to cancer; Checking shows that it take part in cancer of pancreas generation evolution, is the early stage biomarker of believable cancer of pancreas, compares existing certification mark thing and have higher specificity and sensitivity.
On the basis of above-mentioned protein biomarkers thing, the present invention also proposes the application of above-mentioned cancer of pancreas protein biomarkers thing in cancer of pancreas pick-up unit further.
Adopt the cancer of pancreas pick-up unit based on this cancer of pancreas protein biomarkers thing of the present invention, the target of detection is that the method for variance analysis screens above marker protein, compares existing certification mark thing and has higher specificity and sensitivity.
And the present invention also proposes a kind of detection chip of cancer of pancreas protein biomarkers thing further, comprises solid-phase matrix, and be fixed on CRP monoclonal antibody, ICAM-1 monoclonal antibody, OPG monoclonal antibody and the CA19-9 monoclonal antibody on this solid-phase matrix.
The present invention simultaneously also proposes a kind of pick-up unit comprising the detection chip of above-mentioned cancer of pancreas protein biomarkers thing.
Detection chip of the present invention and pick-up unit CRP, ICAM-1, OPG and CA19-9 carry out based on immune specific C RP monoclonal antibody, ICAM-1 monoclonal antibody, OPG monoclonal antibody and the CA19-9 monoclonal antibody prepared, above-mentioned biomarker protein is detected by the specific binding of Ag-Ab, there is higher accuracy and specificity.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the arrangement schematic diagram of the loading wells in embodiment of the present invention detection chip on solid-phase matrix;
Fig. 2 is the global shape schematic diagram after the detection chip encapsulation of embodiment of the present invention cancer of pancreas protein biomarkers thing.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The present invention proposes a kind of cancer of pancreas protein biomarkers thing, comprises CRP (c reactive protein), ICAM-1 (ICAM-1), OPG (osteoprotegerin) and CA19-9 (CA19-9).
The present invention is according to the detection of cancer of pancreas and inspection, and propose above-mentioned biomarker, compare the means of existing clinical analysis and usual CA19-9, CEA, CA242 cancer of pancreas certification mark thing, label of the present invention is more accurate.The discovery of above-mentioned biomarker combination of the present invention and proposition are the measurable indicants of one of the existence of reflection disease and state based on biomarker own, disease, stress with in the process of rehabilitation, any physiological change finally can be embodied on protein level, is disease research means the most intuitively; And the clinical and prognosis of multiple protein biomarker cohort and chronic is closely related, show that synchronization combining measures multiple protein factor and contributes to more fully understanding disease process.
Albumen in the biomarker combination of above-mentioned proposition, belongs to modulability albumen specific to disease.Due to tissue fluid, as in blood plasma, protein classes crosses thousand, concentration range span is up to 10
10, also can only measure concentration range span 10 with the instrument of most advanced property
3; For capturing the interference of healthy background proteins to the distinctive adjustment albumen of disease.Adopt the method for variance analysis to screen above marker protein in the present invention, and verify.Concrete screening process is as follows:
(1) choosing experimenter's totally 210 examples of known health, wherein normal healthy controls 55 example, there is transfer Pancreas cancer patients 90 example in cancer of pancreas initial stage patient (transfer) 65 example.(this research is ratified by ethics examination & verification mechanism, and all experimenters all sign Informed Consent Form.)
Get experimenter's blood sample 2ml respectively, add 1% heparin, in 4 degree, after the centrifugal 15min of 3500RPM, blood plasma packing is divided into normal healthy controls plasma sample, cancer of pancreas initial stage (transfer) patients blood plasma sample according to whether ill and transfer Pancreas cancer patients plasma sample occurs respectively;
(2) then use normal healthy controls plasma sample as antigen immune rabbit, prepare polyclonal antibody; And prepare affinity column with the polyclonal antibody that this is prepared as affinity media;
(3) by cancer of pancreas initial stage clinical samples, there is transfer Pancreas cancer patients sample and cross pillar by above-mentioned affinity column loading respectively, collect stream and wear liquid.
Due to body fluid as protein classes in blood plasma crosses thousand, concentration range span is up to 10
10, the instrument of current most advanced property also can only measure concentration range span 10
3; More than 20 to 100 high-abundance proteins in current antibody is affine removal sample, although improve the recall rate to low-abundance protein, more than 1000 albumen in relative to blood plasma, the analytic signal that the pg concentration of development Research of predicting markers incubation period occurs the ng concentration of current cancer mark used and cancer residual relative high-abundance proteins still exists and serious floods effect.Based on above reason, the present invention adopts minusing technology, with the plasma sample of normal healthy controls as antigen immune rabbit, prepare the polyclonal antibody of anti-normal healthy controls plasma proteins, adopt this antibody as affine adsorbing medium preparative chromatography post, just a large amount of healthy associated protein specific adsorption in patients blood plasma's sample can be removed, thus obtain disease association as much as possible, get rid of the interference of healthy relevant high-abundance proteins.
Low abundance difference expressing protein after the enrichment, owing to eliminating the background interference of a large amount of high-abundance proteins, and after amount has carried out enrichment, just with SDS-PAGE and mass spectrographic means analysis and can detect.
(4) the above-mentioned stream collected is worn the qualification of liquid mass-spectrometric technique and Quantitative Western
In earlier stage screening stage, normal healthy controls group, cancer of pancreas initial stage patient (transfer), generation transfer Pancreas cancer patients carry out Mass Spectrometric Identification respectively, in triplicate, the albumen that every histone identifies in repeating for three times jointly identifies 210,320 and 378 albumen respectively.
Because the present invention is intended to find the early stage biomarker of cancer of pancreas, wherein only all occur in cancer of pancreas initial stage patient (transfer), generation transfer Pancreas cancer patients, but the albumen do not occurred in normal healthy controls has 45.The albumen all occurred in normal healthy controls group, cancer of pancreas initial stage patient (transfer), generation transfer Pancreas cancer patients has 179.This test is analyzed mainly for 45 albumen only jointly occurred in cancer of pancreas initial stage patient (transfer), generation transfer Pancreas cancer patients.
Do not occurred in the contrast of Jiankang by bibliographical information and bioinformatic analysis (GeneOntology and KEGGPathway analysis), but 45 kinds that occur in Pancreas cancer patients blood plasma are analyzed, functional annotation.Find CRP (c reactive protein), ICAM-1 (ICAM-1), OPG (osteoprotegerin), CA19-9 play very important effect in cancer of pancreas generation, evolution.
(5) ELISA method checking
ELISA is utilized to confirm the expression of above-mentioned differential protein in normal control and each disease group blood.Specifically, utilize dilution buffer to be diluted by blood plasma 1:100, then utilize the elisa plate for different protein biomarker to measure the content of biomarker in various disease group blood, each sample duplicate measurements three times.The result data SPSS14.0 software process that elisa technique detects, represents with mean+SD.Compare between the group of carrying out normal distribution data with ANOVA; Accuracy, specificity and the sensitivity of the prediction of various biomarker is analyzed with receiver operator characteristics's curve (ROC).The result detected is as following table 1; show from the result of table 1; in cancer of pancreas group blood plasma, the expression of CRP (c reactive protein), ICAM-1 (ICAM-1), OPG (osteoprotegerin), CA19-9 is significantly higher than normal healthy controls, and increases along with serious (the albuminuria increase) of conditions of patients.
Table 1.ELISA verifies 4 kinds of cancer of pancreas early sign things
Note: ND:NoDifference; * p<0.001vs. normal healthy controls;
Receiver operator characteristics's curve (ROC) is utilized to analyze four kinds of biomarkers in Pancreas cancer patients and normal healthy controls blood further; result shows CRP (c reactive protein), and ICAM-1 (ICAM-1), OPG (osteoprotegerin), CA19-9 area under curve (AUC) are respectively 0.892 (p<0.01), 0.858 (p<0.01), 0.907 (p<0.01) and 0.901 (p<0.01).Sensitivity and Specificity analysis shows, when choosing the highest " youden " index, the sensitivity of four kinds of biomarkers in blood, specificity and concentration cutoff value the results are shown in following table 2, showing that these 4 kinds of protein moleculars may take part in cancer of pancreas generation evolution from table 2 result, is the early stage biomarker of believable cancer of pancreas.
Table 2: in Pancreas cancer patients and normal healthy controls, the ROC of each biomarker analyzes comparing result
| Differential protein | Sensitivity | Specificity | Concentration cutoff value |
| CRP (c reactive protein) | 80.8％ | 76.2％ | 65mg/ml |
| ICAM-1 | 71.2％ | 60.5％ | 456ng/ml |
| OPG | 79.6％ | 55.2％ | 721pg/ml |
| CA19-9 | 84.7％ | 85.8％ | 39U/ml |
(6) with above-mentioned four kinds of protein markers, another 100 cancer of pancreas early detections are verified
To another 100 cancer of pancreas early stage patients, determine that this 4 kinds of protein marker relative contents are with reference to normal ranges, judge in conjunction with four kinds of biomarker measurement results by the measurement result of normal healthy controls and four kinds of protein molecular concentration cutoff values.Carry out statistical treatment to various combination, compare sensitivity and the specificity of various combination, its result sees table 3.Wherein, in the combination that in table 3, symbol " ∩ " represents, when all biomarkers contained by this combination are the positive (namely higher than cutoff value), meter sensitivity and specificity.In the combination that symbol " ∪ " represents, the biomarker contained by this combination has one for being judged as the positive, meter sensitivity and specificity time positive.
Table 3 combines sensitivity and specificity for diagnosing Early pancreatic carcinoma protein biomarker:
| Combination | Sensitivity | Specificity |
| CA19-9∪OPG | 0.933 | 0.665 |
| CA19-9∩OPG | 0.55 | 0.942 |
| CA19-9∪CRP | 0.92 | 0.594 |
| CA19-9∩CRP | 0.547 | 0.983 |
| CA19-9∪ICAM-1 | 0.968 | 0.615 |
| CA19-9∩ICAM-1 | 0.527 | 0.941 |
| ICAM-1∪OPG | 0.923 | 0.505 |
| ICAM-1∩OPG | 0.541 | 0.969 |
| ICAM-1∪CRP∪OPG | 0.989 | 0.4707 |
| ICAM-1∩CRP∩OPG | 0.532 | 0.983 |
| ICAM-1∪CRP∪OPG∪CA19-9 | 0.989 | 0.475 |
| ICAM-1∩CRP∩OPG∩CA19-9 | 0.536 | 0.983 |
Result according to the combine detection of upper table 2 shows, this represents that experimentally object selects the combination of biomarker, can be efficient, special for medical diagnosis on disease; But also can determine further, highly sensitive combination (CA19-9 ∪ OPG; CA19-9 ∪ CRP; CA19-9 ∪ ICAM-1; ICAM-1 ∪ OPG; ICAM-1 ∪ CRP ∪ OPG; ICAM-1 ∪ CRP ∪ OPG ∪ CA19-9) be suitable for first examination; On the contrary, combination (the CA19-9 ∩ OPG that specificity is high; CA19-9 ∩ CRP; CA19-9 ∩ ICAM-1; ICAM-1 ∩ OPG; ICAM-1 ∩ CRP ∩ OPG; ICAM-1 ∩ CRP ∩ OPG ∩ CA19-9) be applicable to the needs such as quadratic search or three inspections carry out the higher judgement inspection of reliability.Such as, if occur when first examination positive, now by the combined method that specificity is higher, secondary judgement is carried out to initial examination result, finally provide effectively and the reference result of Early pancreatic carcinoma diagnosis reliably.
Therefore based on the proposition of above-mentioned biomarker, the present invention proposes the pick-up unit that above-mentioned 4 kinds of biomarker protein are applied to cancer of pancreas.Pick-up unit, based on the above-mentioned 4 kinds of biomarker protein determined, carries out corresponding biochemistry detection, compare in its application existing other the mode of detection and means on, compare existing certification mark thing and there is higher specificity and sensitivity.
The present invention is on the basis that above-mentioned cancer of pancreas protein biomarkers thing combines, the detection chip of further proposition cancer of pancreas protein biomarkers thing, detection chip comprises: solid phase carrier, and is fixed on the CRP monoclonal antibody on this solid phase carrier, ICAM-1 monoclonal antibody, OPG monoclonal antibody and CA19-9 monoclonal antibody.
The detection chip of cancer of pancreas protein biomarkers thing of the present invention, by fixing the monoclonal antibody of above-mentioned protein biomarker thing on solid phase carrier, being caught by the monoclonal antibody of correspondence can the testing protein of specific binding with it, thus realizes being separated the object labelled protein be present in the testing samples such as serum, blood plasma, lymph, interstitial fluid, urine, transudate, cytolysate, juice; Afterwards again through washing, purifying, confirmation and biochemical analysis; The differential expression result of these biomarker protein in testing sample can be obtained.
Wherein, the monoclonal antibody of the 4 kinds of biomarker protein comprised in the detection chip of above-mentioned cancer of pancreas protein biomarkers thing, adopts rabbit to carry out immunity as immune body in the present invention and prepares monoclonal antibody, be prepared as example, specifically comprise such as with CRP monoclonal antibody:
(1) the female small white mouse of about 4 months is selected to carry out the inoculation of CRP albumen, after injection, this CRP albumen enters rabbit peripheral immune organ as antigen by blood circulation or Lymphatic Circulation, corresponding bone-marrow-derived lymphocyte is stimulated to clone, make it activate, breed, and differentiation becomes sensitization bone-marrow-derived lymphocyte;
(2) put to death rabbit when immunity reaches targeted degree, get rabbit spleen; After in small, broken bits, enzyme digestion is digested to single cell suspension, and carries out cell fusion and hybridization with tumour cell;
(3) selectivity cultivation is carried out with HAT selective medium after Fusion of Cells, the hybrid cell of screening successful fusion;
(4) the clone again cell limiting dilutions of successful fusion being carried out hybrid cell cultivates; Adopt immunization method after cultivation, filter out the positive hybridoma cell that can produce CRP protein monoclonal antibody; And this positive hybridoma cell is carried out in vitro culture, in the process of cultivation, its expression of induction in good time, terminates rear separation nutrient solution and can obtain CRP monoclonal antibody.
Prepare above-mentioned CRP monoclonal antibody respectively, after ICAM-1 monoclonal antibody, OPG monoclonal antibody and CA19-9 monoclonal antibody, then adopt the mode of covalent cross-linking or non-covalent to secure it on solid phase carrier.
Solid phase carrier in force as protein-chip generally can be selected from nitrocellulose filter, nylon membrane, golden film, flat board or glass substrate.The object of low abundance difference protein-specific absorption to be carried out in the present invention based on above-mentioned monoclonal antibody, preferably adopt nitrocellulose filter or glass substrate.Its reason is, nitrocellulose filter self is infiltration filter membrane, and through the cellulose microporous membrane of nitration, for the capacity of hollow structure is comparatively large, and has very strong adhesion to protein.
And wherein adopt glass substrate mainly convenient, cheap, process easy, and have enough stability and inertia, the large-scale commercial that can be very suitable for product of the present invention is produced.But in use need to process this glass substrate for feature of the present invention, because be that glass sheet many employings surface hydroxyl first uses N as the glass substrate of protein carrier, N-diethoxy aminopropyl triethoxysilane does surface treatment; Then coupled antibody albumen, but glass substrate has very strong non-specific adsorption, easily cause very serious background interference, when above-mentioned 4 kinds of destination proteins that will detect especially are in the present invention all low-abundance proteins, the annoyance level of a large amount of high-abundance proteins can be more strong.So when the present invention adopts glass substrate to use as solid phase carrier, with PEG (polyglycol), surface treatment is carried out to glass substrate, better by the surface ratio siliconized surfaces signal intensity of PEG process, the ability of large analysis of molecules element (as part) and its combination can be improved, and can non-specific binding be weakened; This is because the space structure of PEG is large, thus it is sterically hindered to reduce between protein, can promote the specificity of affine absorption.
For the ease of the contrast that the above-mentioned protein chip of the present invention detects, above-mentioned protein chip of the present invention is also fixed with positive control and negative control.Wherein, positive control can adopt IgG monoclonal antibody, the IgG monoclonal antibody of this positive control preferably adopts above-mentioned identical immunization machine body preparation, and such as above-mentioned CRP monoclonal antibody adopts rabbit to be immune body preparation, and so this IgG monoclonal antibody is also preferably corresponding is prepared by immune body with rabbit; Adopt this positive control, testing goal albumen in conjunction with situation.Certainly, corresponding above-mentioned positive control, negative control can adopt the point sample dilution of sample loading, and it is not containing any combinative albumen, just in time as blank.
Conveniently Comparative result prevent the situations such as cross pollution, the solid phase carrier of above-mentioned protein chip of the present invention arranges loading wells, and these loading wells can be arranged on the surface of solid phase carrier according to the mode of matrix form or array, be then fixed on to being applied to the monoclonal antibody detecting biomarker protein in these loading wells.Adopt the structure of this loading wells to carry out operation detection, the protein on the one hand in loading wells can be separated well, and it is minimum that cross pollution is dropped to; On the other hand, the sunk structure in hole can be beneficial to add and preserve spotting buffer etc., and the sample after avoiding point sample occurs the problems such as mummification when hatching; 3rd, standardization setting can be carried out to the rule of loading wells and size, thus be beneficial to horizontal comparison is carried out to the amount of point sample, can accurate control points sample amount, be also more beneficial to the calculating of across comparison and result.
Carry out situation more easily for the detection chip with above-mentioned cancer of pancreas protein biomarkers thing, the present invention also proposes a kind of detection kit of cancer of pancreas protein biomarkers thing; Kit comprises the CRP monoclonal antibody for specific detection above-mentioned cancer of pancreas protein biomarkers thing, ICAM-1 monoclonal antibody, OPG monoclonal antibody and CA19-9 monoclonal antibody.With the monoclonal antibody preparation kit corresponding with above-mentioned protein biomarkers thing, carry out specific detection.Detecting with this kit can accomplished in many ways, such as above-mentioned 4 kinds of monoclonal antibodies is made chromatographic column as chromatography media, then carries out post to testing sample, and the auxiliary means such as electrophoresis, mass spectrum detect again afterwards.Or the mode of enzyme-labelled antigen also can be adopted to carry out, carry out compatible reaction respectively with above-mentioned 4 kinds of monoclonal antibodies after sample protein to be measured is carried out enzyme mark, after reaction, input is carried out to the enzyme-labelled antigen that respective monoclonal antibody combines.
But above-mentioned two kinds of methods detected are all inconvenient, cause is in order to further promote convenience and the accuracy of detection, mentioned reagent box of the present invention is with reference to double-antibody method auxiliary collocation auxiliary reagent, further, auxiliary reagent comprises sample dilution buffer, adopts the PBS phosphate buffer of 30 ~ 70mM containing 1.5% ~ 2%BSA (bovine serum albumin(BSA)) stabilizing agent as this sample dilution buffer in the present invention; Adopt this sample dilution buffer to carry out Sample Dilution and washing, wherein BSA is the stabilizing agent of albumen, prevents decomposition and the non-specific adsorption of albumen; And BSA can also alleviate some adverse environmental factors as heating, surface tension and chemical factor, thus the sex change alleviating some albumen in testing process.
In order to the result promoted in kit reagent detection detects and sensitivity analysis, mentioned reagent box of the present invention also needs auxiliary collocation ELIAS secondary antibody according to double antibodies sandwich ratio juris further; After to testing sample point sample, each destination protein can be caught by the monoclonal antibody of correspondence and affine absorption combines, and now adding excessive ELIAS secondary antibody again for being combined with destination protein, generating sandwich body structure; The amount of the ELIAS secondary antibody on so combining just can react the expression of destination protein in testing sample, just can be obtained the result data of destination protein by the signal calculated entrained by ELIAS secondary antibody.Wherein in the invention process, above-mentioned ELIAS secondary antibody can adopt the more common ELIAS secondary antibody containing HRP (horseradish peroxidase) to carry out, and when meeting accuracy, also eliminates the trouble of self design.
Meanwhile, for the ease of the detection to ELIAS secondary antibody signal afterwards, in kit, the PBS that concentrated cleaning solution contains 1 ~ 2%BSA, 0.03 ~ 0.07% Tween-20 can also be included further, for the color composition of concentrated ELIAS secondary antibody and input.Certainly, in requisition for adding developer afterwards, TMB (tetramethyl benzidine) substrate solution.
Certainly, detect for the ease of two sandwich method, can also provide solid-phase matrix in kit, this solid-phase matrix is the matrix being similar to said chip in force, serves as the function of carrier and reaction medium.Concrete shape and form also can see the descriptions in said chip, and in the process used, the monoclonal antibody of correspondence is fixed in the loading wells of solid-phase matrix by the instruction according to kit instructions, then carries out the detection of testing sample; If certainly do not provide this solid-phase matrix carrier in kit of the present invention, the point template also can using ELISA kit in enforcement carries out.
Meanwhile, for the ease of the comparative analysis of result, in kit, standard items, positive control and negative control can be provided.Arranging of contrast can see the description in said chip, and its usage is identical with all product to be measured, synchronously operates, result compared afterwards, provide contrast reference during use with testing sample.
Based on above-mentioned detection chip, the present invention also proposes a kind of cancer of pancreas pick-up unit equipment including above-mentioned detection chip.These as similar in CCD detector is equal to for the equipment of said chip and detection chip signal detection signal equipment can be combined in concrete enforcement; Or chip is directly fixedly placed in the detection mouth of detection, make an entirety.
Of the present invention this comprises the pick-up unit equipment of detection chip, detection chip is made the integral device of the directly above-mentioned biomarker protein of the complete detection of energy, above-mentioned biomarker protein is detected by the specific binding of Ag-Ab, there is higher accuracy and specificity.
For accuracy and application kit that biomarker of the present invention is described carry out the authenticity of testing result, and make the ins and outs of above-mentioned enforcement and process approach can be easier to the understanding of those skilled in the art and implement reference, be illustrated below by way of specific embodiment and actual analysis data.
Embodiment 1
Embodiment 1 is carried out the accuracy of cancer of pancreas detection for illustration of adopting above-mentioned biomarker of the present invention and applies the authenticity that kit carries out testing result.
S11, prepares solid-phase matrix carrier (carrying out for nitrocellulose filter):
Obtain matrix nitrocellulose filter, and according to design (latticed form is 5*5 array, as shown in Figure 1, indicating 1 in Fig. 1 be anchor point, 2 be positive control loading wells, 7 be negative control loading wells, 3 be CRP loading wells, 4 be ICAM-1 loading wells, 5 be OPG loading wells, 6 is CA19-9 loading wells) arrangement mode and point sample position on film, prepare the loading wells with Testing index coating, closed; Final drying, in 4 DEG C of preservations after encapsulation, shape is afterwards as shown in Figure 2;
S12, fixation of C RP monoclonal antibody, ICAM-1 monoclonal antibody, OPG monoclonal antibody and CA19-9 monoclonal antibody on solid-phase matrix, wherein be described for CRP monoclonal antibody that (wherein the preparation of CRP monoclonal antibody is see the preparation process of the rabbit immunization in above-described embodiment, does not repeat them here; The fixed form of residue ICAM-1 monoclonal antibody, OPG monoclonal antibody and CA19-9 monoclonal antibody is carried out with reference to this process):
First by the CRP monoclonal antibody of 0.01 ~ 0.5mg/mL in the PBS damping fluid of 50mMpH7.2, for the preparation of fixing monoclonal antibody solution;
After the loading wells on glutaraldehyde activated nitrocellulose filter slide glass, in loading wells, carry out point sample with the monoclonal antibody solution that 100 μ l had previously been prepared, then cover cover plate, hatch fixing about 5h.Then, with the PBS buffer solution three to four times of 50mMpH7.2 after having hatched, dried for subsequent use after removing unconjugated antibody and impurity;
In order to by wanting the part of fixation of C RP monoclonal antibody (part of not reacting from the teeth outwards with destination protein CRP) to close in glutaraldehyde activated loading wells, at the pH7.2PBS buffer soln dripping the 50mM containing 2%BSA in loading wells; Then cover cover plate and hatch 2h; The pH7.2PBS buffer soln washing of the slide glass front and rear surfaces 50mM closed with BSA three to four times, dries for subsequent use.
S13, obtain urine sample to be detected, then after diluting 3 times with negative control and positive control sample diluting liquid (the PBS damping fluid of 30 ~ 70mM containing 1.5% ~ 2%BSA stabilizing agent), add respectively in the loading wells of detection, each reacting hole application of sample 0.1mL, each sample does 3 parallel experiments, puts 37 DEG C and hatches and make abundant reaction in 1 hour, after discard solution in hole, wash 3 times with concentrated cleaning solution;
S14, every hole adds enzyme mark working fluid (ELIAS secondary antibody containing HRP) 100ul, hatches 30 minutes for 37 DEG C, concussion washing 3 times, each 1 minute;
S15, add on chip conversion zone by developer TMB (tetramethyl benzidine) substrate solution supporting with enzyme mark working fluid, every hole adds 20ul, carries out chemiluminescence.
S16, carries out chemiluminescent scanning with CCD detector and collects signal, according to scanning result display analysis testing result, determines that whether the expression of these biomarker protein is normal.
Adopt the process of above-mentioned enforcement, the above-mentioned biomarker protein of 500 experimenters (ages 58 ~ 70) is detected, testing result statistics finds wherein have 24 experimenters to carry out secondary according to the mode of the combination sort of upper table 3 and be judged to be doubtful Pancreas cancer patients; Within follow-up half a year, tracking and clinical examination and symptom complex analysis are again carried out further to this 24 improper experimenter.Result shows, has 22 people to be diagnosed as Pancreas cancer patients (wherein, 6 Genus Homos, in the type spread, wherein have the type that 16 Genus Homos did not spread in the initial stage) in 24 people, remains 2 people's identifications and does not belong to Pancreas cancer patients, but other interference illnesss.
From final statistics, the present invention is directed to the detection kit of above-mentioned label, it is based on double-antibody method, and the corresponding affinity antibody detecting above-mentioned biomarker that builds detects, and has higher accuracy and susceptibility.And compare current CA19-9, CEA, CA242 cancer of pancreas certification mark thing, cancer of pancreas can be contained and to fall ill early stage situation and be unlikely to miss treatment.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. a cancer of pancreas protein biomarkers thing, is characterized in that, is included in stable existence in human serum/blood plasma and detectable CRP, ICAM-1, OPG and CA19-9.
2. the application of cancer of pancreas protein biomarkers thing in cancer of pancreas pick-up unit as claimed in claim 1.
3. a detection chip for cancer of pancreas protein biomarkers thing according to claim 1, is characterized in that, comprise solid-phase matrix, and is fixed on CRP monoclonal antibody, ICAM-1 monoclonal antibody, OPG monoclonal antibody and the CA19-9 monoclonal antibody on this solid-phase matrix.
4. the detection chip of cancer of pancreas protein biomarkers thing as claimed in claim 3, it is characterized in that, described solid-phase matrix is the one in nitrocellulose filter, nylon membrane, golden film, flat board or glass substrate.
5. the detection chip of cancer of pancreas protein biomarkers thing as claimed in claim 4, it is characterized in that, described glass substrate is carry out the glass substrate after surface treatment with PEG.
6. the detection chip of the cancer of pancreas protein biomarkers thing as described in any one of claim 3 to 5, it is characterized in that, described solid-phase matrix is provided with the loading wells of matrix arrangement, described CRP monoclonal antibody, ICAM-1 monoclonal antibody, OPG monoclonal antibody and CA19-9 monoclonal antibody are individually fixed in described loading wells.
7. the detection chip of the cancer of pancreas protein biomarkers thing as described in any one of claim 3 to 5, is characterized in that, described solid-phase matrix is also provided with positive control and/or negative control.
8. one kind includes the cancer of pancreas pick-up unit of the detection chip of the cancer of pancreas protein biomarkers thing described in any one of claim 3 to 7.
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| CN201510408299.9A CN105092845A (en) | 2015-07-10 | 2015-07-10 | Pancreatic cancer protein biomarker and application and detection chip thereof, and detection device |
| PCT/CN2015/089892 WO2017008388A1 (en) | 2015-07-10 | 2015-09-17 | Pancreatic protein biomarker, uses of same, detection chip therefor, and detection device |
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| WO2017008388A1 (en) | 2017-01-19 |
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