[No authors listed]
Porcine reproductive and respiratory syndrome virus (PRRSV) causes a series of inflammatory reactions in sites of infection, companied by the upregulation of key inflammatory factor TNFα. TNFα, which serves as a "master regulator" of inflammatory cytokine production, is mainly produced by macrophages at the early infection stage. Here, we showed that porcine alveolar macrophages produced a great amount of soluble TNFα upon PRRSV infection. Furthermore, we found that TNFα had great anti-PRRSV effect. Next, by using inhibitor and genetic modification methods, we addressed that porcine TNFα production was mediated by ADAM17. Lastly, we proved that the (78)Arg-Ser-Ser motif of porcine TNFα contained the essential information for efficient cleavage. Taken together, our findings provide the direct evidence that ADAM17 cleaves porcine TNFα, which represents a new view for identifying potential therapeutic targets in anti-PRRSV therapy.
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