China Animal Husbandry and Veterinary Medicine ›› 2021, Vol. 48 ›› Issue (3): 1001-1012.doi: 10.16431/j.cnki.1671-7236.2021.03.024

• Preventive Veterinary Medicine • Previous Articles     Next Articles

Expression of Porcine Colony-stimulating Factor and Interleukin-4 and Its Function in Inducing Porcine Dendritic Cells in vitro

TU Chongzhi, LI Yuchen, LIN Jian   

  1. College of Life Science, Nanjing Agricultural University, Nanjing 210095, China
  • Received:2020-08-28 Online:2021-03-20 Published:2021-03-18

Abstract: The purpose of the experiment was to establish a eukaryotic expression system for porcine colony-macrophage colony stimulating factor (GM-CSF) and interleukin-4 (IL-4),and use the expressed two cytokines to induce porcine dendritic cells in vitro and test their cell function.Firstly,the eukaryotic expression vectors of GM-CSF and IL-4 were constructed and verified on HEK293 cells.Then,the two cytokines were used to induce porcine bone marrow-derived and blood-derived monocytes.Finally,the surface markers CD1a,SLA-Ⅱ and SWC3a of porcine dendritic cells were detected by fluorescence microscopy and flow cytometry respectively,and the morphological and immunological functions of dendritic cells were identified.The results showed that the two eukaryotic expression vectors successfully expressed GM-CSF and IL-4 in HEK293 cells.Morphological observation showed that monocytes induced by cytokines had aggregation after 3 days of culture,and typical dendritic processes could be observed at the 6th day.Flow cytometry showed that the expressed cytokines could successfully induce the transformation of porcine bone marrow-derived and blood-derived monocytes into dendritic cells,and the double positive rates of SWC3a+/SLA-Ⅱ+ and CD1a+/SLA-Ⅱ+ were significantly increased,and there was no difference from the commercial cytokine treatment group.The results of cell phagocytosis test showed that the dendritic cells induced by the expressed cytokines were immature dendritic cells with strong phagocytic ability.In this study,we successfully established a method for the expression of porcine recombinant protein GM-CSF and IL-4 in eukaryotic cells,and induced mononuclear dendritic cells from pig bone marrow and blood using two recombinant cytokines in vitro,which laid a foundation for further study on the role of porcine dendritic cells and various pathogenic microorganisms.

Key words: porcine; GM-CSF; IL-4; dendritic cells

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