Inhibition of proinflammatory and innate immune signaling pathways by a cytomegalovirus RIP1-interacting protein.

ABSTRACT: TNFalpha is an important cytokine in antimicrobial immunity and inflammation. The receptor-interacting protein RIP1 is an essential component of the TNF receptor 1 signaling pathway that mediates the activation of NF-kappaB, MAPKs, and programmed cell death. It also transduces signals derived from Toll-like receptors and intracellular sensors of DNA damage and double-stranded RNA. Here, we show that the murine CMV M45 protein binds to RIP1 and inhibits TNFalpha-induced activation of NF-kappaB, p38 MAPK, and caspase-independent cell death. M45 also inhibited NF-kappaB activation upon stimulation of Toll-like receptor 3 and ubiquitination of RIP1, which is required for NF-kappaB activation. Hence, M45 functions as a viral inhibitor of RIP1-mediated signaling. The results presented here revea

SUBMITTER: Mack C 

PROVIDER: S-EPMC2268590 | biostudies-literature | 2008 Feb

REPOSITORIES: biostudies-literature