猪圆环病毒2型特异性单克隆抗体的制备与鉴定
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174 2U14
(ORFs):ORF1 and ORF2.To be specific.ORF1 encodes viral replica・
tion-related Rep (35000)and Rep’ (1 9000)proteins.Pogranichnyy et aL c7】
showed that Rep protein might be as-
sociated with the production of PCV2-
neutralizing antibodies.ORF2,encod-
ing viraI capsid proteins with high im-
munogenicity,is the preferred gene
for construction of recombinant vac- cinesE ̄.In this study.BALB/c mice were
immunized using synthetic tandem
polypeptide of Cap protein epitope of
PCV2 as the antigen protein to pre-
pare specific monoclonaI antibody which Iaid solid foundation for fu rther
investigating the structure and function
of PCV2 ORF2 epitopes and estab- Iishing specific sensitive detection
methods to Identif、,and diagnose
PCV2.associated diseases.
Materials and Methods
Cells,detected protein and experi-
mentaI animals
Myeloma cells SP2/0.PK-1 5 cells
and PCV2 whole virus were preserved
in Key Laboratory of Veterinary Bio-
Iogicals Engineering and Technology,
Ministry of Aqriculture;five eight-week- old female BALB/c mice were provided
by the Experimental AnimaI Center of
Yangzhou University;prokaryotically
expressed PCV2 PET32a.-ORF2 pro--
tein(expressed in E co11),eukaryoti-
cally expressed PCV2 ORF1——ORF2
tandem protein (expressed in High— FiveTM cells1 and Baculovirus VP10
protein were constructed,expressed
and preserved in Key Laboratory of
Veterinary Biologicals Engineering and
Technology,Ministry of Agriculture.
Reagents PEG-4000,HAT, HT, DMSO
(Sigma ChemicaI Co.,Ltd.1:DMEM,
fetaI calf serum (Gibico Co.,Lld.);
HRP-labeled goat anti—mouse IgG
【Vazyme Biotech(Nanjing)Co.,Ltd.】; FITC-labeled goat anti-mouse IgG
(Wuhan Boster BiotechnoIogy Co.,
Ltd.). Preparation of antigen
A reported epitope of Cap protein
of PCV2 was synthesized by Abmart (Shanghai)Co.,Ltd.,with the polypep- tide amino acid sequence of DR-
Tl DYFQPNNK.Tandem polypeptides of the sequence were used as the anti-
gen for animalimmunization. Animalimmunization
Five eight..week--old female BALB/
c mice were immunized.Firstly,each
BALB/c mouse was injected intraperi-
toneally with 50 ug of antigen that was
emulsified by equal amount of Fre-
und s complete adjuvant;after two
weeks.BALB/c mice were injected in- traperitoneally with equal amount of
antigen that was emulsified by Fre-
und’s incomplete adjuvant;after two
weeks.BALB/c mice were injected jn- traDeritOnea¨V with equaI amount of
antigen until the serum antibody titer
reached above 1:1 0 000.Finally.each
BALB/c mouse was injected hypoder-
mically with 30 uq of antigen 3 d before
fusion to strengthen the immunit、,. Screening and subcloning of hy-
bridoma
Detection program The experiment
was conducted by indirect ELISA
method using the established PCV2
PET32a-ORF2 recombinant protein as
antigen.Recombinant protein was di-
Iuted using carbonate buffer f0.05
mol/L,pH 9.6)and coated on ELlSA plates.using 1%BSA as blocking so-
lution.HRP—labeled goat anti-mouse
IgG as enzyme.—linked secondary anti--
body,and TMB one-component chro-
mogenic agent as substrate. Detection and screening of anti-
body positive wells After fusion.
when hybridoma cells covered 1,3 Of
the area of culture wells,the super-
natant was screened by indirect ELISA
method,namely,the supernatant of
celI culture was detected using E coil-
expressed PET32a--ORF2 recombi--
nant protein and expression products
0f PET32a empty vector.to screen
hybridoma cells exhibiting positive re-
action with E col-expressed PET32a-
ORF2 recombinant protein and nega-
tive reaction with expression products Of PET32a empty vector.
Subcloning of cells in antibody
positive wells Cells in antibody
positive wells were subcloned jn ac-
cordance with the Iimiting dilution method[ ̄.
Scalable culture and cryopreserva-
tion of positive monoclonaI cells
Positive hybridoma cells were trans-
ferred fr0m 96-welI plates to 24-welI
plates.and then transferred to 6-welI
plates after overgrowing,which were
finally transferred to cell culture flasks for incubation.1ncubated cells were
cryopreserved in accordance with
c0nventi0naI methods.
Preparation of ascites
Scalable culture of antibody..posi--
tive hybridoma cells was conducted.
Firstly.eight.week.old female BALB,c
mice were iniected intraperitoneally with 0.5 ml of sterile Iiquid paraffin;af—
ter one week,each BALB/c mouse
was injected inlraperitoneally with 5 x 1 0 hybridoma cells:after 1 0 d.ascites
of mice with extremely enlarged ab-
dominal circumference were collected
for titer detection by ELlSA and were preserved at-70 oC.
1dentification of reactivity and
specificity of monoclonaI antibody
Western blot assay using prokary-