China Animal Husbandry and Veterinary Medicine ›› 2019, Vol. 46 ›› Issue (11): 3181-3189.doi: 10.16431/j.cnki.1671-7236.2019.11.006

• Biotechnology • Previous Articles     Next Articles

Effect of Pathogenic E.coli HPI on the Expression of Burnout-related Molecules in Caspase-1 Cells

CHA Jinlong1, LIU Chaoying2, GAO Hong1, WANG Shiyu1, SHAN Chunlan2, JING Linxi1, WANG Hao1, YANG Wei1   

  1. 1. College of Veterinary Medicine, Yunnan Agricultural University, Kunming 650201, China;
    2. Faculty of Animal Science and Technology, Yunnan Agricultural University, Kunming 650201, China
  • Received:2019-04-04 Online:2019-11-20 Published:2019-11-25

Abstract: In order to study the molecular mechanism of cell death in porcine macrophages induced by pathogenic E.coli HPI from Saba pig in Yunnan,the pig derived macrophages infected with HPI positive strain of Saba pig in Yunnan were taken as the breakthrough point. E.coli was isolated from feces of yellow-white dysentery in a large scale farm in Chuxiong,Yunnan.The HPI irp2 gene was detected by PCR technology.Macrophages were infected with HPI positive strains (HPI+) and negative strains (HPI-),respectively,and LPS+ATP group and blank control group were set up,cells and their supernatants were collected at 0.5 and 6 h.The expression levels of Caspase-1,IL-1β and IL-18 in different groups were detected by Real-time PCR,and the contents of pro-IL-1β,pro-IL-18,IL-1β and IL-18 in cell supernatant were detected by ELISA.The results showed that pathogenic E.coli was successfully isolated and HPI irp2 gene positive strains were successfully obtained by PCR.Real-time PCR results showed that the expression levels of Caspase-1,IL-1β and IL-18 of HPI+ and HPI- groups were all higher than those of blank control group.It showed an upward trend,and HPI+ group was higher than HPI- group.ELISA results showed that compared with blank control group,the expression of pro-IL-1β,pro-IL-18,IL-1β and IL-18 in HPI+ and HPI- groups were generally up-regulated,and the HPI+ group was higher than that in HPI- group.The results showed that the pathogenic E.coli HPI of Saba pig in Yunnan could promote the release of inflammatory cytokines IL-1β and IL-18 from pig macrophages by up regulating the expression of Caspase-1,IL-1β and IL-18 mRNA in porcine macrophages,and eventually induce inflammation.

Key words: pathogenic E.coli; HPI; macrophages; cell death

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