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RIP1 Cleavage in the Kinase Domain Regulates TRAIL-Induced NF-κB Activation and Lymphoma Survival.

Abstract：

:Although TRAIL is considered a potential anticancer agent, it enhances tumor progression by activating NF-κB in apoptosis-resistant cells. Cellular FLICE-like inhibitory protein (cFLIP) overexpression and caspase-8 activation have been implicated in TRAIL-induced NF-κB activation; however, the underlying mechanisms are unknown. Here, we report that caspase-8-dependent cleavage of RIP1 in the kinase domain (KD) and intermediate domain (ID) determines the activation state of the NF-κB pathway in response to tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) treatment. In apoptosis-sensitive cells, caspase-8 cleaves RIP1 in the KD and ID immediately after the recruitment of RIP1 to the receptor complex, impairing IκB kinase (IKK) recruitment and NF-κB activation. In apoptosis-resistant cells, cFLIP restricts caspase-8 activity, resulting in limited RIP1 cleavage and generation of a KD-cleaved fragment capable of activating NF-κB but not apoptosis. Notably, depletion of the cytoplasmic pool of TRAF2 and cIAP1 in lymphomas by CD40 ligation inhibits basal RIP1 ubiquitination but does not prompt cell death, due to CD40L-induced cFLIP expression and limited RIP1 cleavage. Inhibition of RIP1 cleavage at the KD suppresses NF-κB activation and cell survival even in cFLIP-overexpressing lymphomas. Importantly, RIP1 is constitutively cleaved in human and mouse lymphomas, suggesting that cFLIP-mediated and caspase-8-dependent limited cleavage of RIP1 is a new layer of mechanism that promotes NF-κB activation and lymphoma survival.

journal_name

Mol Cell Biol

journal_title

Molecular and cellular biology

authors

Zhang L,Blackwell K,Workman LM,Chen S,Pope MR,Janz S,Habelhah H

doi

10.1128/MCB.00692-15

subject

Has Abstract

pub_date

2015-10-01 00:00:00

pages

3324-38

issue

19

eissn

0270-7306

issn

1098-5549

pii

MCB.00692-15

journal_volume

35

pub_type

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