RIPK-dependent Necrosis and Its Regulation by Caspases: a Mystery in Five Acts

Overview

Journal Mol Cell

Publisher Cell Press

Specialty Cell Biology

Date 2011 Oct 11

PMID 21981915

Citations 77

Authors

Douglas R Green

Andrew Oberst

Christopher P Dillon

Ricardo Weinlich

Guy S Salvesen

Affiliations

Soon will be listed here.

Abstract

Caspase-8, FADD, and FLIP orchestrate apoptosis in response to death receptor ligation. Mysteriously however, these proteins are also required for normal embryonic development and immune cell proliferation, an observation that has led to their implication in several nonapoptotic processes. While many scenarios have been proposed, recent genetic and biochemical evidence points to unregulated signaling by the receptor-interacting protein kinases-1 (RIPK1) and RIPK3 as the lethal defect in caspase-8-, FADD-, and FLIP-deficient animals and tissues. The RIPKs are known killers, being responsible for a nonapoptotic form of cell death with features similar to necrosis. However, the mechanism by which caspase-8, FADD, and FLIP prevent runaway RIPK activation is unknown, and the signals that trigger these events during development and immune cell activation remain at large. In this review, we will lay out the evidence as it now stands, reinterpreting earlier observations in light of new clues and considering where the investigation might lead.

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