抗豬偽狂犬病毒卵黃抗體的制備及其保護效力的研究
[Abstract]:* pseudorabies has been eradicated in some developed countries in Europe and America. In China, vaccination can only be prevented by vaccination. Since the end of 2011, pseudorabies has occurred in most of the farms in North China, causing serious economic losses, and there is no effective drug to treat the disease when the outbreak of pseudorabies. Therefore, the development of effective * therapeutic drugs is very important to control the spread of pseudorabies. The specific yolk antibody (IgY) is attracting a great deal of attention in controlling infectious bacteria or viral diseases. Compared with mammalian IgG, IgY has the advantages of low cost, convenience, high yield and good biosafety, but at present, it is not available at home and abroad. * a report on the application of IgY against swine pseudorabies. The aim of this study is to obtain a high level of yolk antibody against PRV by preparing pseudorabies virus (PRV) inactivated vaccine, and to study the in vitro and in vivo effects of the prepared IgY * so as to provide a scientific basis for the treatment of pseudorabies in the future. The research contents are as follows: 1 * preparation of yolk antibody against PRV and establishment of indirect ELISA detection method. 24 healthy 40 week old laying hens (three yellow chickens) were randomly divided into 3 groups (A, B, C group), 8 in each group. 3 groups of chickens were immunized with the inactivated vaccine, and the immunization regimen was: A group was injected with normal saline, and B group was inactivated PRV Bart. The chickens in group C were immunized with inactivated PRV Bartha-K61 vaccine strain and Freund's adjuvant after emulsification. The chickens in group C were immunized with inactivated PRV Bartha-K61 vaccine strain and Freund's adjuvant after the first immunization. The chickens were immunized twice after the first immunization. The chickens were immunized twice after the second immunization. The chickens were immunized three times with the dosage of 1 mL, 2 mL and 3 mL respectively. IgY was extracted and purified from egg yolk by water dilution, salting-out and ultrafiltration. IgY was detected by SDS-PAGE. An indirect ELISA method was developed for the detection of anti-PRV yolk antibody. The concentration and time of each reaction solution were determined by matrix titration. The specificity, sensitivity and reproducibility of the assay were evaluated. The IgY levels of three groups of immunized chickens were detected by this method. The results showed that the concentration of IgY was 4.6 mg/mL per 10 mL yolk solution, the optimum coating concentration of antigen was 1:100, the working concentration of ELISA was 1:4000, and the critical value was 0.170-0.200. The established indirect ELISA assay was highly specific, sensitive and reproducible; both group B and group C had higher levels of IgY than group B. On the whole, the level of IgY in group C was higher than that in group B. The results showed that IgY did not induce CPE in PK-15 cells, and had good biological safety. IgY cell neutralization test: IgY was diluted to different concentrations, added to 96-well cell culture plate, added 200 TCID50 PRV at 37 C and 1 h after adding. The results showed that half of the protective PD50 of IgY on PK-15 cells was 0.04, indicating that IgY had a strong neutralizing activity on PRV; when the concentration of IgY was 575 ug/mL, the positive pair was positive. In vivo neutralization test of IgY mice: 36 clean grade (Balb / c) mice were randomly divided into three groups, 12 mice in each group. Among them, negative control group: each mouse was subcutaneously inoculated with 0.2 mL normal saline; Sex control group: each mouse was subcutaneously inoculated with 0.2 mL PRV LA virus strain (TCID 50 107); experimental group: IgY (25.8 mg/mL) and PRV virus were concentrated in the groin of mice, inoculated subcutaneously with 0.2 mL/mouse after one hour at 37 C. After clinical symptoms of mice, blood samples were taken from three groups of mice, DNA was extracted from serum, and virus was detected by PCR. The survival of mice was analyzed when no more mice died. All mice were killed and the brain, liver, spleen and kidney of mice were collected. Viruses in tissues were detected by PCR. Neutralization test in IgY mice showed that anti-PRVIgY could provide 80% protection (8/10) for mice and inhibit the proliferation of PRV effectively.
【學(xué)位授予單位】:南京農(nóng)業(yè)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2015
【分類號】:S852.4
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