Albert Sickmann

Publications of Albert Sickmann

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

  Authors: Claudia Mack, Albert Sickmann, David Lembo, Wolfram Brune

  Proceedings of the National Academy of Sciences of the United States of America. 03/2008; 105(8):3094-9.

  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 theTNFalpha 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 reveal a mechanism of viral immune subversion and demonstrate how a viral protein can simultaneously block proinflammatory and innate immune signaling pathways by interacting with a central mediator molecule.

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