The Innate Immune Sensor NLRC3 Attenuates Toll-like Receptor Signaling Via Modification of the Signaling Adaptor TRAF6 and Transcription Factor NF-κB

Overview

Journal Nat Immunol

Date 2012 Aug 7

PMID 22863753

Citations 168

Authors

Monika Schneider

Albert G Zimmermann

Reid A Roberts

Lu Zhang

Karen V Swanson

Haitao Wen

Beckley K Davis

Irving C Allen

Eda K Holl

Zhengmao Ye

Adeeb H Rahman

Brian J Conti

Timothy K Eitas

Beverly H Koller

Jenny P-Y Ting

Affiliations

Soon will be listed here.

Abstract

Several members of the NLR family of sensors activate innate immunity. In contrast, we found here that NLRC3 inhibited Toll-like receptor (TLR)-dependent activation of the transcription factor NF-κB by interacting with the TLR signaling adaptor TRAF6 to attenuate Lys63 (K63)-linked ubiquitination of TRAF6 and activation of NF-κB. We used bioinformatics to predict interactions between NLR and TRAF proteins, including interactions of TRAF with NLRC3. In vivo, macrophage expression of Nlrc3 mRNA was diminished by the administration of lipopolysaccharide (LPS) but was restored when cellular activation subsided. To assess biologic relevance, we generated Nlrc3(-/-) mice. LPS-treated Nlrc3(-/-) macrophages had more K63-ubiquitinated TRAF6, nuclear NF-κB and proinflammatory cytokines. Finally, LPS-treated Nlrc3(-/-) mice had more signs of inflammation. Thus, signaling via NLRC3 and TLR constitutes a negative feedback loop. Furthermore, prevalent NLR-TRAF interactions suggest the formation of a 'TRAFasome' complex.

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