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Mol Cell Biol. 2005 Nov;25(22):9949-59.

Regulation of apoptotic c-Jun N-terminal kinase signaling by a stabilization-based feed-forward loop.

Author information

1
Department of Pathology and Center for Neurobiology and Behavior, College of Physicians and Surgeons, Columbia University, 630 W. 168th Street, New York, New York 10032, USA. zx18@columbia.edu

Abstract

A sequential kinase cascade culminating in activation of c-Jun N-terminal kinases (JNKs) plays a fundamental role in promoting apoptotic death in many cellular contexts. The mechanisms by which this pathway is engaged in response to apoptotic stimuli and suppressed in viable cells are largely unknown. Here, we show that apoptotic stimuli increase endogenous cellular levels of pathway components, including POSH, mixed lineage kinases (MLKs), and JNK interacting protein 1, and that this effect occurs through protein stabilization and requires the presence of POSH as well as activation of MLKs and JNKs. Our findings suggest a self-amplifying, feed-forward loop mechanism by which apoptotic stimuli promote the stabilization of JNK pathway components, thereby contributing to cell death.

PMID:
16260609
PMCID:
PMC1280282
DOI:
10.1128/MCB.25.22.9949-9959.2005
[Indexed for MEDLINE]
Free PMC Article
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