Developmental Checkpoints Guarded by Regulated Necrosis

Overview

Journal Cell Mol Life Sci

Publisher Springer

Specialty Biology

Date 2016 Apr 9

PMID 27056574

Citations 15

Authors

Christopher P Dillon

Bart Tummers

Katherine Baran

Douglas R Green

Affiliations

Soon will be listed here.

Abstract

The process of embryonic development is highly regulated through the symbiotic control of differentiation and programmed cell death pathways, which together sculpt tissues and organs. The importance of programmed necrotic (RIPK-dependent necroptosis) cell death during development has recently been recognized as important and has largely been characterized using genetically engineered animals. Suppression of necroptosis appears to be essential for murine development and occurs at three distinct checkpoints, E10.5, E16.5, and P1. These distinct time points have helped delineate the molecular pathways and regulation of necroptosis. The embryonic lethality at E10.5 seen in knockouts of caspase-8, FADD, or FLIP (cflar), components of the extrinsic apoptosis pathway, resulted in pallid embryos that did not exhibit the expected cellular expansions. This was the first suggestion that these factors play an important role in the inhibition of necroptotic cell death. The embryonic lethality at E16.5 highlighted the importance of TNF engaging necroptosis in vivo, since elimination of TNFR1 from casp8 (-/-), fadd (-/-), or cflar (-/-), ripk3 (-/-) embryos delayed embryonic lethality from E10.5 until E16.5. The P1 checkpoint demonstrates the dual role of RIPK1 in both the induction and inhibition of necroptosis, depending on the upstream signal. This review summarizes the role of necroptosis in development and the genetic evidence that helped detail the molecular mechanisms of this novel pathway of programmed cell death.

Citing Articles

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RIPK3 modulates growth factor receptor expression in endothelial cells to support angiogenesis.

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