China Animal Husbandry and Veterinary Medicine ›› 2020, Vol. 47 ›› Issue (4): 1156-1162.doi: 10.16431/j.cnki.1671-7236.2020.04.021

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Immunogenicity of Recombinant Salmonella Typhimurium Expressing Protective Antigen Gene F1I2 of Pseudomonas aeruginosa in Mink

ZHANG Mingliang1,2,3, SUN Changjiang2, GU Jingmin2, CUI Ziyin2, HAN Wenyu2   

  1. 1. College of Biological Science and Food Engineering, Anyang Institute of Technology, Anyang 455000, China;
    2. College of Veterinary Medicine, Jilin University, Changchun 130062, China;
    3. Academician Workstation of Animal Disease Control and Nutrition Immunity in Henan Province, Anyang 455000, China;
    4. Henan Joint International Research Laboratory of Veterinary Biologics Research and Application, Anyang 455000, China
  • Received:2019-09-18 Online:2020-04-20 Published:2020-04-17

Abstract: The purpose of this study was to investigate the immunogenicity of recombinant Salmonella Typhimurium strain Δasdlh430(pYA-F1I2) carrying Pseudomonas aeruginosa protective antigen genes F190-342(F1) and I21-83(I2) in mink.Nine 7-month-old healthy minks were randomly divided into three groups,three in each group:Control group,hypodermic injection of sterile normal saline;LH430 strain immunization group,hypodermic injection of 2.0×108 CFU per mink;Δasdlh430(pYA-F1I2) strain immunization group,hypodermic injection of 2.0×108 CFU per mink.Every group was immunized once on the 15th day after the first immunization.On the 15th,30th and 45th day after the first immunization,the blood of mink was collected and the level of IgG in serum was measured.Peripheral blood monocytes were isolated on the 45th day after the first immunization.The number of F1I2 specific antibody secreting cells and Salmonella specific antibody secreting cells were detected by Eli-Spot.At the same time,lymphocytes were isolated from the spleen,and the specific lymphocyte proliferation of F1I2 and Salmonella was detected by MTT method.The results showed that the titers of F1I2 specific IgG antibody and Salmonella specific IgG antibody in serum of Δasdlh430(pYA-F1I2) group increased gradually at the sampling point,and reached the maximum value at the 45th day.On the 45th day after immunization,the number of F1I2 specific IgG secretory cells in Δasdlh430(pYA-F1I2) group was extremely significantly higher than that in control and LH430 groups (P < 0.01),and the number of Salmonella specific antibody secretory cells was extremely significantly higher than that of control group (P < 0.01),but there was no significant difference with LH430 group (P > 0.05).At the same time,F1I2 antigen and Salmonella antigen stimulated the proliferation of mink spleen lymphocytes significantly (P < 0.01).This study could provide a theoretical basis for the development of a new bivalent genetic engineering vaccine against mink hemorrhagic pneumonia and Salmonella infection.

Key words: Pseudomonas aeruginosa; mink; hemorrhagic pneumonia; immunogenicity

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