TAK1 is a Central Mediator of NOD2 Signaling in Epidermal Cells

Overview

Journal J Biol Chem

Specialty Biochemistry

Date 2007 Oct 30

PMID 17965022

Citations 44

Authors

Jae-Young Kim

Emily Omori

Kunihiro Matsumoto

Gabriel Nunez

Jun Ninomiya-Tsuji

Affiliations

Soon will be listed here.

Abstract

Muramyl dipeptide (MDP) is a peptidoglycan moiety derived from commensal and pathogenic bacteria, and a ligand of its intracellular sensor NOD2. Mutations in NOD2 are highly associated with Crohn disease, which is characterized by dysregulated inflammation in the intestine. However, the mechanism linking abnormality of NOD2 signaling and inflammation has yet to be elucidated. Here we show that transforming growth factor beta-activated kinase 1 (TAK1) is an essential intermediate of NOD2 signaling. We found that TAK1 deletion completely abolished MDP-NOD2 signaling, activation of NF-kappaB and MAPKs, and subsequent induction of cytokines/chemokines in keratinocytes. NOD2 and its downstream effector RICK associated with and activated TAK1. TAK1 deficiency also abolished MDP-induced NOD2 expression. Because mice with epidermis-specific deletion of TAK1 develop severe inflammatory conditions, we propose that TAK1 and NOD2 signaling are important for maintaining normal homeostasis of the skin, and its ablation may impair the skin barrier function leading to inflammation.

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