Porcine Interleukin-2 Expression in Insect Cells and Its Enhancement of Pig Immunity to Swine Influenza Virus Inactivated Vaccine |
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Authors: | CHEN Hong-ying ZHANG Hong-ying HUANG Yan-quan CUI Bao-an WANG Zhen-ya WANG Yan-bin LIU Jin-peng CHAO An-jun |
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Affiliation: | College of Animal Husbandry and Veterinary,Henan Agricultural University,Zhengzhou 450002,P.R.China |
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Abstract: | Mature porcine interleukin-2 (pIL-2) gene was amplified by PCR from the plasmid pGEM-T-pIL2 and cloned into the baculovirus pFastBacTM Dual vector of the Bac-to-Bac baculovirus expression system under the control of the PH promoter.Recombinant pIL-2 (rpIL-2) expressed in Sf9 insect cells was detected by sodium dodecyl sulfate-polyacrylamide gel electrophoresis and immunofluorescence assay.Western blot analysis confirmed that the rpIL-2 protein had a molecular mass of 20 kDa,which was larger than the molecular mass of the mature protein predicted based on its peptide sequence.The rpIL-2 protein induced in vitro proliferation of ConA-stimulated porcine splenocytes and enhanced in vivo protective immune responses induced by vaccinating the pigs with inactivated oil emulsion vaccine against swine influenza virus.The results showed that the rpIL-2 expressed in Sf9 insect cells has immunoenhancement effects;the finding lays the foundation for the preparation of a specific recombinant IL-2 protein and the development of a novel immune adjuvant of vaccines against various infectious porcine pathogens to increase the immunoprotective efficacy of vaccines. |
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Keywords: | porcine interleukin-2 Sf9 insect cells expression inactivated vaccine swine influenza virus |
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