NF-kappaB Inhibits T-cell Activation-induced, P73-dependent Cell Death by Induction of MDM2

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2010 Oct 6

PMID 20921405

Citations 41

Authors

Valere Busuttil

Nathalie Droin

Laura McCormick

Francesca Bernassola

Eleonora Candi

Gerry Melino

Douglas R Green

Affiliations

Soon will be listed here.

Abstract

NF-κB is a key transcription factor involved in the regulation of T-cell activation and proliferation upon engagement of the T-cell receptor (TCR). T cells that lack the IκB kinase (IKKβ) are unable to activate NF-κB, and rapidly undergo apoptosis upon activation. NF-κB activation following T-cell receptor engagement induces the expression of Mdm2 through interaction with NF-κB sites in its P1 promoter, and enforced expression of Mdm2 protected T cells deficient for NF-κB activation from activation-induced cell death. In T cells with intact NF-κB signaling, ablation or pharmacologic inhibition of Mdm2 resulted in activation-induced apoptosis. Mdm2 coprecipitates with p73 in activated T cells, and apoptosis induced by inhibition of Mdm2 was p73-dependent. Further, Bim was identified as a p73 target gene required for cell death induced by Mdm2 inhibition, and a p73-responsive element in intron 1 of Bim was characterized. Our results demonstrate a pathway for survival of activated T cells through NF-κB-induced Mdm2, which blocks Bim-dependent apoptosis through binding and inhibition of p73.

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