Molecular steps of tumor necrosis factor receptor-mediated apoptosis

Current Molecular Medicine
S Gupta

Abstract

Until recently it was believed that TNF-induced apoptosis is mediated exclusively by TNF-RI because TNF-RII lacks death domain. However, it has been demonstrated that TNF-RII enhances TNF-RI-mediated apoptosis. In this review, I have discussed the evidence and mechanisms by which TNF-RII regulates TNF-alpha-induced apoptosis. A role of RIP is emphasized and novel mechanisms of FLIP-mediated inhibition of apoptosis are discussed. In addition, various mechanisms of TNF-induced activation of mitochondrial pathway of apoptosis have been reviewed.

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Apoptosis

Apoptosis is a specific process that leads to programmed cell death through the activation of an evolutionary conserved intracellular pathway leading to pathognomic cellular changes distinct from cellular necrosis