ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2014, Vol. 45 ›› Issue (4): 647-653.doi: 10.11843/j.issn.0366-6964.2014.04.020

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PCV2 Regulates PAMs Secreting IL-1β,IL-6 and IL-10 through the Activation of MyD88 in vitro

HAN Jun-yuan,GUO Hua,ZHANG Ya-qun,DUAN Dian-ning,LI Xiao-lin,CHEN Meng-meng,ZHANG Shu-xia*   

  1. (College of Veterinary Medicine,Nanjing Agricultural University,Nanjing 210095, China)
  • Received:2013-10-30 Online:2014-04-23 Published:2014-04-23

Abstract:

Six 30-day-old piglets (post-weaned) were selected as experiment animals,which were free of porcine circovirus type 2 (PCV2) and porcine reproductive and respiratory syndrome virus (PRRSV) antibody and antigen as detected by ELISA and RT-PCR.The alveolar macrophages (AMs) isolated aseptically were divided into four groups,i.e.,control group,molecular myeloid differentiation 88 (MyD88) interference group (interference group),PCV2 infection group (PCV2 group) and PCV2 infection-MyD88 interference group (PCV2-interference group),and cultured in vitro.The MyD88 gene was knocked down by siRNA (small interfering RNA).After PCV2 infection,the cells and the cultural supernatants were collected at 0,6,12,24 and 48 h respectively.The gene-silencing efficiency of siRNA was detected by fluorescence quantitative PCR.The intracellular expression of MyD88 protein was detected by Western blot.The dynamic changes of IL-1β,IL-6 and IL-10 in the supernatants were assayed by ELISA.The results showed that siRNA could lead to 78% of the MyD88 gene silencing,and significantly affected the expression of MyD88 protein (P<0.01).The amount of MyD88 expressed in AMs in PCV2 group increased significantly after 6 h (P <0.05),which was significantly higher compared to that in PCV2-interference group (P <0.01) at 12,24 and 48 h.The yield of IL-1β secreted in AMs at 6 h infected with PCV2,was notably higher compared with those in control group (P<0.01) and PCV2-interference group (P<0.05).The level of the secreted IL-6 in the PCV2 group was significantly higher than those in the control group (P<0.01) and PCV2-interference group (P<0.05) at 6 and 12 h.The yield of IL-10 secreted in AMs significantly increased (P<0.01) at 12,24 and 48 h infected with PCV2; the yield of IL-10 in PCV2-interference group significantly decreased (P<0.01) at 24 and 48 h.The results indicated that the infection of PCV2 contributed to different changes of the secretion of IL-1β,IL-6 and IL-10 in PAMs cultured in vitro,where MyD88 was involved as an important regulator.

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