CN106706923A - Method for detecting specific IgA antibody of O-type foot-and-mouth disease virus of pig and detection kit thereof - Google Patents
Method for detecting specific IgA antibody of O-type foot-and-mouth disease virus of pig and detection kit thereof Download PDFInfo
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Abstract
The invention discloses a method for detecting a specific IgA antibody of an O-type foot-and-mouth disease virus of a pig. A foot-and-mouth disease virus VP1 protein expressed by a prokaryotic expression system serves as an envelope antigen, a mouse-anti-swine IgA monoclonal antibody is used as a second antibody, an enzyme labeled goat-anti-mouse IgG antibody is used as an indicator, a sample to be detected reacts with the envelope antigen, the monoclonal antibody and the enzyme labeled antibody in sequence and then is compared with a reference positive sample and a negative sample, and then the specific IgA antibody level of the foot-and-mouth disease virus of the pig can be evaluated. The invention further provides a detection kit for the method. The method has the advantages that an effective method for evaluating the mucosal immune effect of a foot-and-mouth disease is provided, and a new method is provided for early diagnosis of foot-and-mouth disease infection, the specific IgA antibody of the foot-and-mouth disease virus in a nose swab of the pig can be rapidly and accurately detected, sample acquisition operation is simple and convenient, labor consumption is low, and the stress to animals is small.
Description
Technical field
The present invention relates to technical field of biological, and in particular to the O-shaped foot and mouth disease virus specificity IgA of one kind detection pig resists
The method and its detection kit of body.
Background technology
Aftosa（Foot-and-Mouth Disease, FMD）It is by Picornaviridae Hostis
A kind of acute, hot, high degree in contact that foot and mouth disease virus causes and can quick long-distance communications animal epidemic, animal infection
Production performance declines afterwards, and the ill newborn animal death rate is high.The object mainly poultry kind such as pig, ox, sheep and other artiodactyls are infected, easily
Move thing up to more than 70 to plant.The disease is once broken out will bring greatly economic damage to aquaculture and international animal Products Trade
Lose, International Animal Health tissue（OIE）Be listed in first of 15 A class animal epidemic lists, be also China once occur it is necessary
One of class zoonosis for reporting.Foot and mouth disease virus has O, A, C, SAT1, SAT2, SAT3（That is the type of South Africa 1,2,3）With
Asia1（Type Asia 1）7 serotypes.Almost One serotype foot and mouth disease virus has been infected between various without immune protective efficiency
Animal can still infect another serotype foot and mouth disease virus and fall ill.Four kinds of Structural protein VP1s of foot and mouth disease virus, VP2, VP3,
In VP4, main antigen site is not only existed on VP1 albumen（141-160aa, 200-213aa and 21-40aa）, and contain
Host's recognition site of FMD viruses.Therefore select the albumen of the regional gene construction of expression vector expression and purification can be as good
The good alternative envelope antigen for preparing antibody assay kit.
IgA antibody is widely present in the juices such as colostrum, tear, saliva as the main effects factor of mucosa-immune,
It not only can in the very first time and virus, and can the further activation system immune response by way of mucous membrane, and then
Prevent the intrusion of virus.Its major function has:Prevent and stick, be immunized and exclude, dissolution of bacteria neutralizes virus, and mediate antibody is relied on
Cell-mediated cytotoxic effect（ADCC,antibody-dependent cell-mediated cytotoxicity
）, anti-inflammatory, the effect of promotion native factor and regulation mucosa-immune react.The IgA antibody of foot-and-mouth disease virus resistant is foot and mouth disease virus
Specific mark is produced in respiratory tract and alimentary canal first after infection or vaccine mucosal immune, while also reacted mucous membrane exempting from
The effect of epidemic disease vaccine.In the market also without the kit for being capable of effective detection foot and mouth disease virus Specific IgA antibody, in view of
Mucosa-immune mechanism and mucosa-immune vaccine research are goed deep into recent years, hoof-and-mouth disease in a kind of detection mucosal secretions of exploitation
The ELISA kit of malicious Specific IgA antibody level, can more accurately react mouth disease virus infection and mucosa-immune shape
State, is aftosa mucosa-immune effect while monitoring foot and mouth disease virus Specific IgA antibody dynamic rule using the method
Evaluate and immune programme for children optimization provides theoretical foundation.
The content of the invention
The purpose of the present invention is aiming at above-mentioned defect of the prior art, there is provided one kind detection O-shaped hoof-and-mouth disease of pig
The method and its detection kit of malicious Specific IgA antibody.
To achieve these goals, the technical scheme of present invention offer is：The O-shaped foot and mouth disease virus specificity of one kind detection pig
The method of IgA antibody, it is mono- with the anti-pig IgA of mouse using the FMDV VP1 albumen of prokaryotic expression as envelope antigen
Clonal antibody is secondary antibody, and the sheep anti-mouse igg antibody of enzyme mark is instruction, after measuring samples react with envelope antigen, then by list
The further reaction of anti-and enzymic-labelled antibody, finally contrasts with reference to positive and negative sample, you can for evaluating pig mouthful
The Specific IgA antibody level of aphtovirus.
Further, a kind of method of the above-mentioned O-shaped foot and mouth disease virus Specific IgA antibody of detection pig, including following step
Suddenly：
1) preparation of envelope antigen and coating：
The 639bP fragments of O-shaped FMDV-VP1 albumen are cloned into pET-30a (+) prokaryotic expression carrier, it is correct through digestion, sequencing
Afterwards, E.coli BL-21 (E3) are transformed into, VP1 albumen is gone out through IPTG induced expressions, it is pure with Ni-Agarose His label proteins
Change kits albumen, through the purified product of the prokaryotic expression, with carbonate buffer solution by antigen diluent into 4 μ
G/mL, the amount for taking 100 μ l/ holes is added in 96 hole elisa Plates, and 4 DEG C of coatings are overnight；
2) closing of elisa plate and preservation：
Step 1) the coating ELISA Plate overnight that obtains wash 4 times with PBST, patted dry for the last time, and 100 μ l are added per hole containing 6%
The ELISA Plate stabilizer of horse serum, room temperature places 30min, is dried naturally after discarding liquid, using aluminium foil bag vacuum seal, 4 DEG C
Preserve；
3) with reference to the preparation of yin and yang attribute sample：
The sample that O-shaped foot and mouth disease virus attacks 7-21d pigs after poison is gathered, detects that OD450 values are 1.5 after blended, a series of dilution
± 0.05 sample is the positive；The sample of collection aftosa feminine gender pig different time sections, OD450 values are detected after blended, dilution
Sample for 0.15 ± 0.05 is feminine gender, aseptic subpackaged standby；
4) preparation of secondary antibody and enzyme labelled antibody concentrate：
The anti-pig IgA monoclonal antibodies of mouse 4 DEG C of preservations, the sheep anti mouse of HRP marks after the 100 times of dilutions of sample diluting liquid containing 25% glycerine
IgG antibody 4 DEG C of preservations after the 100 times of dilutions of enzyme labelled antibody stabilizer；
5) in sample foot and mouth disease virus Specific IgA antibody detection：
Step 2) on the ELISA Plate that obtains, the μ L of measuring samples 100 after dilution are added per hole, while adding yin and yang attribute control each two
Hole, 37 DEG C are incubated 30min, and Sample Dilution method is：Sample presses 1:2 dilutions, i.e., first add 50 μ l sample diluting liquids in plate is diluted,
Again plus 50 μ l test samples；ELISA Plate is taken out, after wash 4 times with PBST, 100 μ L steps 4 of addition per hole) mouse of dilution that obtains
Anti- pig IgA monoclonal antibodies, 37 DEG C of incubation 30min；ELISA Plate is taken out, after washing 4 times with PBST, 100 μ L steps is added per hole
4) sheep anti-mouse igg antibody that is HRP marks and diluting for obtaining, 37 DEG C of incubation 30min；ELISA Plate is taken out, 4 are washed with PBST
After secondary, the TMB nitrite ions of 100 μ L are added per hole, add the sulfuric acid of 100 μ L/ hole 1moL/L to terminate anti-after room temperature reaction 10min
Should, OD450nm values are read on ELIASA；
6) date comprision：
The OD450nm values of test sample are more than or equal into negative average value 2.5 times are judged to the positive, less than negative average value
2.5 times are judged to feminine gender, then carry out statistical analysis to sample yin and yang attribute.
Further, a kind of method of the above-mentioned O-shaped foot and mouth disease virus Specific IgA antibody of detection pig, it is described with reference to sun
Property sample be that the 7-21 days nose swab samples of the pig of infection aftosa after poison are attacked in laboratory, negative sample is through PrioCHECK
FMDV NS kits detection foot and mouth disease virus non-structural protein antibody is feminine gender, A types, O-shaped, AsiaI aftosas liquid phase blocking
ELISA kit detects serum antibody titer<1/4, FMDV specific PCR detection antigen is the nose swab of negative pig；Treat sample
Product are the nose swab of pig.
Second object of the present invention there is provided the O-shaped foot and mouth disease virus Specific IgA antibody indirect ELISA inspection of a boar
Test agent box, the detection kit is carried out using the method for the above-mentioned detection O-shaped foot and mouth disease virus Specific IgA antibody of pig
Detection.
Further, the O-shaped foot and mouth disease virus Specific IgA antibody indirect ELISA testing kit of above-mentioned pig, the examination
Included in agent box：The ELISA Plate of pre-coated antigen, positive reference, negative reference, sample diluting liquid, 100 times of anti-pig IgA of mouse are mono-
Anti- concentrate, 100 times of enzyme labelled antibody concentrates, PBST（10×）, TMB nitrite ions and terminate liquid.
Technical key point is：
1st, using the FMDV VP1 albumen of prokaryotic expression as envelope antigen, with the anti-pig IgA monoclonal antibodies of mouse
It is secondary antibody, the sheep anti-mouse igg antibody of enzyme mark after measuring samples react with envelope antigen, is marked to indicate by monoclonal antibody and enzyme
The further reaction of antibody, it is finally special to evaluate swine foot-and-mouth disease virus with reference to positive nose swab and negative nose swab contrast
Property IgA antibody level.
2nd, envelope antigen is through Escherichia coli pET-30a（+）) the VP1 albumen that purifies after prokaryotic expression, the albumen contains
Foot and mouth disease virus major antigenic sites（141-160aa, 200-213aa and 21-40aa）, and the host's knowledge containing FMD viruses
Other site（The peptide motifs of RGD tri-）.
3rd, secondary antibody is the anti-pig IgA monoclonal antibodies of mouse, three it is anti-be HRP marks sheep anti-mouse igg antibody.
4th, be that the 7-21 days nose swabs of the pig of infection aftosa after poison are attacked in laboratory with reference to positive, negative sample be through
PrioCHECK FMDV NS kits detection foot and mouth disease virus non-structural protein antibody is feminine gender；A types, O-shaped, AsiaI mouthfuls of hoof
Epidemic disease LPB-ELISA kit detects serum antibody titer<1/4；FMDV specific PCRs detection antigen is that the nose of negative pig is wiped
Son.
Beneficial effects of the present invention are：The invention discloses a kind of detection O-shaped foot and mouth disease virus Specific IgA antibody of pig
Method and its detection kit, the sheep anti-mouse igg antibody marked by envelope antigen, the anti-pig IgA monoclonal antibodies of mouse, HRP, are carried
A kind of effective ways for evaluating aftosa mucosa-immune effect have been supplied, and for the early diagnosis of infection of foot-and-mouth disease provides one kind newly
Method, can fast and accurately detect the foot and mouth disease virus Specific IgA antibody in hog snout swab, and the method is easy to operate, institute
Take time short, can be used for the detection of a large amount of samples and the evaluation of mucosa-immune effect, and the acquisition operations of sample are easy, people
Power consumption it is small, to animal stress be small.
Specific embodiment
Preparation source used of the invention：
96 hole high-affinity ELISA Plates：Purchased from Coastar companies.
The anti-pig IgA monoclonal antibodies of mouse：Purchased from AbD Serotec companies.
The sheep anti-mouse igg antibody of HRP marks：Purchased from Abcam companies.
Enzymic-labelled antibody stabilizer：Purchased from Sigma companies.
TMB one-component nitrite ions：Purchased from Beijing Suo Laibao bio tech ltd.
10×PBST：Purchased from Beijing Suo Laibao bio tech ltd.
ELISA Plate stabilizer：Purchased from the Di Tai bio tech ltd of Jinan hundred.
Sample diluting liquid：Purchased from the Di Tai bio tech ltd of Jinan hundred.
Embodiment 1：
The preparation method of kit：
1st, the preparation of envelope antigen and the optimal selection for being coated with concentration：
The 639bP fragments of O-shaped FMDV-VP1 albumen are cloned into pET-30a（+）Prokaryotic expression carrier, it is correct through digestion, sequencing
Afterwards, E.coli BL-21 (E3) are transformed into, VP1 albumen is gone out through IPTG induced expressions, it is pure with Ni-Agarose His label proteins
Change kits albumen.Through the purified product of the prokaryotic expression, a series of dilutions 8 are carried out with carbonate buffer solution
μ g/mL, 4 μ g/mL, 2 μ g/mL, 1 μ g/mL, 0.5 μ g/mL, 0.25 μ g/mL, each concentration coating two are arranged, 100 μ L/
Hole is added in 96 hole elisa Plates, and 4 DEG C of coatings are overnight.Result shows that positive value OD450 values are big when envelope antigen concentration is 4 μ g/mL
In 1.0, and the value of P/N is maximum, it is thus determined that the concentration is optimal coating concentration.
Table 1 is shown as Checkerboard titration antigen working concentration（OD450nm）.
Table 1
2nd, the closing of ELISA Plate and preservation：
Above-mentioned ELISA Plate is washed 4 times with PBST, and the ELISA Plate stabilizer of 100 μ l is added per hole（Containing 6% horse serum）, room temperature placement
30min.Dried naturally after discarding liquid, using aluminium foil bag vacuum seal, 4 DEG C of preservations.
3rd, with reference to the preparation of yin and yang attribute sample：
The collection O-shaped foot and mouth disease virus of P3 Animal Houses attacks the nose swab of 7-21d pigs after poison（Fall ill）, blended, a series of dilutions
By detection, sample 1:OD450 values are 1.5 ± 0.05 after 4 dilutions, and the batch sample is aseptic subpackaged as standard positive；Adopt
The nose swab of collection aftosa feminine gender pig different time sections, through detection, sample 1 after blended, a series of dilutions:OD450 after 2 dilutions
It is 0.15 ± 0.05 to be worth, and the batch sample is aseptic subpackaged as standard female.
4th, the selection of secondary antibody and enzyme labelled antibody working solution：
The best effort concentration of the anti-pig IgA monoclonal antibodies of secondary antibody mouse and three anti-sheep anti-mouse igg antibodies is determined with Checkerboard titration method,
Then sample diluting liquid and enzyme labelled antibody stabilizer containing 25% glycerine are diluted to storage concentration 1:100,4 DEG C of preservations.Result shows
When the anti-pig IgA monoclonal antibodies 1 of mouse:20K dilutes, the sheep anti-mouse igg antibody 1 of HRP marks:P/N values are maximum when 5K dilutes.It is determined that
Secondary antibody 1:20K, three anti-1:5K is diluted to best effort concentration.
Table 2 is shown as the anti-pig IgA monoclonal antibodies of Checkerboard titration mouse and enzyme labelled antibody working concentration（OD450nm）.
Table 2
5th, sensitiveness, specificity experiments：
Sensitivity experiments：
Detect that 21 parts are directly attacked 3-11d and 50 part of cohabitation infection the 7-21 days after poison is fallen ill using the indirect ELISA method of invention
Clinical nose swab sample, have obvious rising in the time period according to pertinent literature report aftosa Specific IgA antibody level
Trend.ELISA testing results also indicate that the time period hoof-and-mouth disease Specific IgA antibody has positive rate very high.Illustrate the party
Method has preferable sensitiveness.
Table 3 is shown as indirect ELISA method and detects O-shaped infection of foot-and-mouth disease pig clinical sample result.
Table 3
Specificity experiments：
Pig circular ring virus are have detected with the indirect ELISA method set up（PCV）Specific IgA antibody positive, CSFV
(CSFV) Specific IgA antibody positive, porcine reproductive and respiratory syndrome virus (PRRSV) antibody positive sample, pig are popular
Property diarrhea virus infection piglet intestinal mucosa flushing liquor sample.In view of there is A type aftosas always in China, therefore in sensitivity experiments
In increased A type infection of foot-and-mouth disease samples, analyze the specificity of the method.ELISA testing results show that O-shaped foot and mouth disease virus is special
Different in nature IgA antibody does not have cross reaction with Prevention of Common Occurrence Porcine Disease Specific IgA antibody, but anti-with A types foot and mouth disease virus specificity IgA
Body has certain cross reaction, but by original criterion when 0.3 ± 0.05 brings up to 0.4 ± 0.05, A types aftosa sun
Property rate is substantially reduced.So that sensitiveness will be 92.9% by original 100%, but specificity rises to 90% by original 45.71%,
The diagnostic kit be ensure that while having good Sensitivity and Specificity, fundamentally ensure that result accuracy and can
By property.
Table 4 is shown as the specificity experiments of swine foot-and-mouth disease virus Specific IgA antibody indirect ELISA method.
Table 4
Table 5 is shown as indirect ELISA method and detects O-shaped infection of foot-and-mouth disease pig clinical sample result.
Table 5
6th, the other compositions of kit, assembling and preservation：
The composition of 6.1 kits：
The PBST cleaning solutions of TMB one-components nitrite ion and 10x are purchased from Beijing Suo Laibao bio tech ltd.Sample diluting liquid
Purchased from the Di Tai bio tech ltd of Jinan hundred.Vacuum packaging aluminium foil box is customized.Graph paper one, specification is a.Examination
Agent box is stored in 4 DEG C of refrigerators.
Table 6 is shown as the O-shaped foot and mouth disease virus Specific IgA antibody indirect ELISA testing kit content of pig.
Table 6
6.2nd, kit specification
Specification experiment layout is as shown in table 7.
Table 7
Sample collection requirement：Because the collection of mucous membrane sample is influenceed larger by the physiological status of animal, and need cumbersome mark
Standardization, therefore the basically identical cotton balls of size is gripped with tweezers in sample collection, after the circle of insertion nasal septum position rotation 3, by nose
Swab insertion fills 1 mLPBS in advance（Containing 2000 units/mL penicillin, streptomysin and O.01% thimerosal）5 mL centrifugation
Guan Zhong, avoids sticky nose liquid as far as possible, if having feed, dirt etc. in running into the nostril of pig, after first being wiped away with cotton balls again again
Collection.After 4 DEG C of infiltrations overnight of sample of collection, 10000min/r centrifugations 5min.- 70 DEG C preserve (if needing to protect for a long time after packing
Depositing can be toward the glycerine of addition 25% in PBS).
Kit operating procedure：
1. it is loaded：ELISA Plate is taken out, in 2 hole Positive control wells（A1、B1）Directly add 100 μ l positive controls, 2 hole negative control holes
（C1、D1）Directly add 100 μ l negative controls.Test sample presses 1:2 dilutions, i.e., first add 50 μ l dilutions, then add in tested hole
50 μ l test samples.37 DEG C of incubation 30min.
2. the anti-pig IgA monoclonal antibodies of mouse are added：ELISA Plate is taken out, liquid is got rid of, is washed with PBST 4 times, last time blotting paper is clapped
It is dry.The anti-pig IgA monoclonal antibodies of mouse are pressed 1 with sample diluting liquid:100 dilutions, 100 μ L/ holes.37 DEG C of incubation 30min.
3. sheep anti-mouse igg-HRP is added：ELISA Plate is taken out, liquid is got rid of, is washed with PBST 4 times, last time blotting paper is clapped
It is dry.Sheep anti mouse enzyme labelled antibody is pressed 1 with sample diluting liquid:100 dilutions, 100 μ L/ holes.37 DEG C of incubation 30min.
4. tmb substrate is added：ELISA Plate is taken out, liquid is got rid of, is washed with PBST 4 times, blotting paper is patted dry.Add substrate solution
100 μ L, color development at room temperature 10min.
4. terminate liquid is added：Add the μ L of terminate liquid 100, terminating reaction per hole.
5. ELIASA reads OD450nm values.
Computational methods：
Yin and yang attribute comparison mean value is calculated：
Positive control average value=（OD-A1+OD-B1）/2；
Negative control average value=（OD+C1+OD+D1）/2.
Experiment establishment condition：
A holes positive control OD450nm values at least hole OD values are more than 1.0；The OD450nm in a holes negative control at least hole is small
In 0.2.
Result judgement：
Test sample is then judged to the positive more than 2.5 times of negative average value, and 2.5 times less than negative average value are judged to feminine gender.
Finally it should be noted that：The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention,
Although being described in detail to the present invention with reference to the foregoing embodiments, for a person skilled in the art, it still may be used
Modified with to the technical scheme described in foregoing embodiments, or equivalent is carried out to which part technical characteristic.
All any modification, equivalent substitution and improvements within the spirit and principles in the present invention, made etc., should be included in of the invention
Within protection domain.
Sequence table
<110>Lanzhou Veterinary Inst., Chinese Acedemy of Agaricultural Sciences
<120>A kind of method and its detection kit for detecting the O-shaped foot and mouth disease virus Specific IgA antibody of pig
<210> 1
<211> 220
<212> PRT
<213>VP1 albumen
<400> 1
Met Thr Thr Ser Xaa Gly Glu Ser Ala Asp Pro Val Thr Ala Xaa Val
1 5 10 15
Glu Asn Tyr Gly Gly Glu Thr Gln Xaa Gln Arg Arg His His Thr Asp
20 25 30
Val Ser Phe Ile Leu Asp Arg Phe Val Lys Val Thr Pro Lys Asp Gln
35 40 45
Ile Asn Val Xaa Asp Leu Met Gln Thr Pro Pro His Thr Leu Val Gly
50 55 60
Ala Leu Leu Arg Thr Ala Thr Tyr Tyr Phe Ala Asp Leu Glu Val Ala
65 70 75 80
Val Lys His Glu Gly Asp Leu Thr Trp Val Pro Asn Gly Xaa Pro Glu
85 90 95
Ala Ala Leu Asn Asn Thr Thr Asn Pro Thr Ala Tyr His Lys Ala Xaa
100 105 110
Leu Thr Arg Leu Ala Leu Pro Tyr Thr Ala Pro His Arg Val Leu Ala
115 120 125
Thr Val Tyr Xaa Gly Asn Cys Xaa Tyr Ala Glu Gly Ser Leu Thr Asn
130 135 140
Val Arg Gly Asp Leu Gln Val Leu Ala Gln Lys Ala Ala Arg Pro Leu
145 150 155 160
Pro Thr Ser Phe Asn Tyr Gly Ala Ile Lys Ala Thr Arg Val Thr Glu
165 170 175
Leu Leu Tyr Arg Met Lys Arg Ala Xaa Thr Tyr Cys Pro Arg Pro Leu
180 185 190
Leu Ala Val His Pro Asp Glu Ala Arg His Lys Gln Lys Ile Val Ala
195 200 205
Pro Val Lys Gln Ser Leu His His His His His His
210 215 220
<110>Lanzhou Veterinary Inst., Chinese Acedemy of Agaricultural Sciences
<120>A kind of method and its detection kit for detecting the O-shaped foot and mouth disease virus Specific IgA antibody of pig
<210> 1
<211> 220
<212> PRT
<213>VP1 albumen
<400> 1
Met Thr Thr Ser Xaa Gly Glu Ser Ala Asp Pro Val Thr Ala Xaa Val
1 5 10 15
Glu Asn Tyr Gly Gly Glu Thr Gln Xaa Gln Arg Arg His His Thr Asp
20 25 30
Val Ser Phe Ile Leu Asp Arg Phe Val Lys Val Thr Pro Lys Asp Gln
35 40 45
Ile Asn Val Xaa Asp Leu Met Gln Thr Pro Pro His Thr Leu Val Gly
50 55 60
Ala Leu Leu Arg Thr Ala Thr Tyr Tyr Phe Ala Asp Leu Glu Val Ala
65 70 75 80
Val Lys His Glu Gly Asp Leu Thr Trp Val Pro Asn Gly Xaa Pro Glu
85 90 95
Ala Ala Leu Asn Asn Thr Thr Asn Pro Thr Ala Tyr His Lys Ala Xaa
100 105 110
Leu Thr Arg Leu Ala Leu Pro Tyr Thr Ala Pro His Arg Val Leu Ala
115 120 125
Thr Val Tyr Xaa Gly Asn Cys Xaa Tyr Ala Glu Gly Ser Leu Thr Asn
130 135 140
Val Arg Gly Asp Leu Gln Val Leu Ala Gln Lys Ala Ala Arg Pro Leu
145 150 155 160
Pro Thr Ser Phe Asn Tyr Gly Ala Ile Lys Ala Thr Arg Val Thr Glu
165 170 175
Leu Leu Tyr Arg Met Lys Arg Ala Xaa Thr Tyr Cys Pro Arg Pro Leu
180 185 190
Leu Ala Val His Pro Asp Glu Ala Arg His Lys Gln Lys Ile Val Ala
195 200 205
Pro Val Lys Gln Ser Leu His His His His His His
210 215 220
Claims (5)
1. it is a kind of detect the O-shaped foot and mouth disease virus Specific IgA antibody of pig method, it is characterised in that with prokaryotic expression system table
The FMDV VP1 albumen for reaching as envelope antigen, with the anti-pig IgA monoclonal antibodies of mouse as secondary antibody, enzyme mark sheep anti mouse
IgG antibody to indicate, after the reaction of measuring samples and envelope antigen, then by the further reaction of monoclonal antibody and enzymic-labelled antibody, most
Contrasted with reference to positive and negative sample afterwards, you can for evaluating the Specific IgA antibody level of swine foot-and-mouth disease virus.
2. a kind of method for detecting the O-shaped foot and mouth disease virus Specific IgA antibody of pig according to claim 1, its feature exists
In comprising the following steps：
1）The preparation of envelope antigen and coating：
The 639bP fragments of O-shaped FMDV-VP1 albumen are cloned into pET-30a（+）Prokaryotic expression carrier, it is correct through digestion, sequencing
Afterwards, E.coli BL-21 are transformed into（E3）, go out VP1 albumen through IPTG induced expressions, it is pure with Ni-Agarose His label proteins
Change kits albumen, through the purified product of the prokaryotic expression, with carbonate buffer solution by antigen diluent into 4 μ
G/mL, the amount for taking 100 μ l/ holes is added in 96 hole elisa Plates, and 4 DEG C of coatings are overnight；
2）The closing of elisa plate and preservation：
Step 1）The coating for obtaining ELISA Plate overnight is washed 4 times with PBST, is patted dry for the last time, adds 100 μ l to contain 6% per hole
The ELISA Plate stabilizer of horse serum, room temperature places 30min, is dried naturally after discarding liquid, using aluminium foil bag vacuum seal, 4 DEG C
Preserve；
3）With reference to the preparation of yin and yang attribute sample：
The sample that O-shaped foot and mouth disease virus attacks 7-21d pigs after poison is gathered, detects that OD450 values are 1.5 after blended, a series of dilution
± 0.05 sample is the positive；The sample of collection aftosa feminine gender pig different time sections, OD450 values are detected after blended, dilution
Sample for 0.15 ± 0.05 is feminine gender, aseptic subpackaged standby；
4）The preparation of secondary antibody and enzyme labelled antibody concentrate：
The anti-pig IgA monoclonal antibodies of mouse 4 DEG C of preservations, the sheep anti-mouse igg of HRP marks after the 100 times of dilutions of sample diluting liquid containing 25% glycerine
Antibody 4 DEG C of preservations after the 100 times of dilutions of enzyme labelled antibody stabilizer；
5）The detection of foot and mouth disease virus Specific IgA antibody in sample：
Step 2）On the ELISA Plate for obtaining, the μ L of measuring samples 100 after dilution are added per hole, while adding yin and yang attribute control each two
Hole, 37 DEG C are incubated 30min, and Sample Dilution method is：Sample presses 1:2 dilutions, i.e., first add 50 μ l sample diluting liquids in plate is diluted,
Again plus 50 μ l test samples；ELISA Plate is taken out, after washing 4 times with PBST, 100 μ L steps 4 is added per hole）The mouse of the dilution for obtaining
Anti- pig IgA monoclonal antibodies, 37 DEG C of incubation 30min；ELISA Plate is taken out, after washing 4 times with PBST, 100 μ L steps is added per hole
4）The sheep anti-mouse igg antibody that is HRP marks and diluting for obtaining, 37 DEG C of incubation 30min；ELISA Plate is taken out, 4 are washed with PBST
After secondary, the TMB nitrite ions of 100 μ L are added per hole, add the sulfuric acid of 100 μ L/ hole 1moL/L to terminate anti-after room temperature reaction 10min
Should, OD450nm values are read on ELIASA；
6）Date comprision：
The OD450nm values of test sample are more than or equal into negative average value 2.5 times are judged to the positive, less than negative average value
2.5 times are judged to feminine gender, then carry out statistical analysis to sample yin and yang attribute.
3. a kind of method for detecting the O-shaped foot and mouth disease virus Specific IgA antibody of pig according to claim 2, its feature exists
In the reference positive is that the 7-21 days nose swab samples of the pig of infection aftosa after poison are attacked in laboratory, and negative sample is
Through PrioCHECKFMD VNS kits detection foot and mouth disease virus non-structural protein antibody is feminine gender, A types, O-shaped, AsiaMouthful
Fever aphthous LPB-ELISA kit detects serum antibody titer<1/4, FMDV specific PCR detection antigen is the nose of negative pig
Swab；Measuring samples are the nose swab of pig.
4. the O-shaped foot and mouth disease virus Specific IgA antibody indirect ELISA testing kit of pig, it is characterised in that the detection reagent
Box is detected using the method for any described detection O-shaped foot and mouth disease virus Specific IgA antibodies of pig of claim 1-3.
5. the O-shaped foot and mouth disease virus Specific IgA antibody indirect ELISA testing kit of pig according to claim 4, it is special
Levy and be, included in the kit：ELISA Plate, positive reference, negative reference, sample diluting liquid, 100 of pre-coated antigen
Times anti-pig IgA monoclonal antibodies concentrate of mouse, 100 times of enzyme labelled antibody concentrates, PBST（10×）, TMB nitrite ions and terminate liquid.
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| CN108766583A (en) * | 2018-05-15 | 2018-11-06 | 贵州都匀市黔昌畜牧发展有限责任公司 | A kind of pig immune optimization method based on data analysis |
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| CN111175501A (en) * | 2019-12-31 | 2020-05-19 | 广西大学 | ELISA detection method of PEDV specific SIgA antibody in sow colostrum and kit thereof |
| CN112684177A (en) * | 2020-12-17 | 2021-04-20 | 北京维德维康生物技术有限公司 | Dairy multi-factor rapid detection kit and detection method thereof |
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| CN109187993A (en) * | 2018-09-13 | 2019-01-11 | 中国农业科学院兰州兽医研究所 | A kind of foot and mouth disease A-type virus sIgA antibody ELISA detection kit and its application |
| CN109187993B (en) * | 2018-09-13 | 2020-06-16 | 中国农业科学院兰州兽医研究所 | Foot-and-mouth disease type A virus sIgA antibody ELISA detection kit and application thereof |
| CN109557307A (en) * | 2018-12-04 | 2019-04-02 | 中国农业科学院兰州兽医研究所 | A kind of visualization quick detection kit of O-shaped foot and mouth disease virus and preparation method thereof |
| CN109655612A (en) * | 2019-01-31 | 2019-04-19 | 中国农业科学院兰州兽医研究所 | A kind of detection kit and detection method of Asia1 type foot and mouth disease virus |
| CN111175501A (en) * | 2019-12-31 | 2020-05-19 | 广西大学 | ELISA detection method of PEDV specific SIgA antibody in sow colostrum and kit thereof |
| CN111175501B (en) * | 2019-12-31 | 2023-10-03 | 广西大学 | ELISA detection method and kit for PEDV specific SIgA antibody in sow colostrum |
| CN112684177A (en) * | 2020-12-17 | 2021-04-20 | 北京维德维康生物技术有限公司 | Dairy multi-factor rapid detection kit and detection method thereof |
| CN112684177B (en) * | 2020-12-17 | 2024-05-28 | 北京维德维康生物技术有限公司 | Milk product multi-factor rapid detection kit and detection method thereof |
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