Crosstalk Between PKCzeta and the IL4/Stat6 Pathway During T-cell-mediated Hepatitis

Overview

Journal EMBO J

Specialties Biotechnology
Molecular Biology

Date 2004 Nov 5

PMID 15526032

Citations 26

Authors

Angeles Duran

Angelina Rodriguez

Pilar Martin

Manuel Serrano

Juana Maria Flores

Michael Leitges

Maria T Diaz-Meco

Jorge Moscat

Affiliations

Soon will be listed here.

Abstract

PKCzeta is required for nuclear factor kappa-B (NF-kappaB) activation in several cell systems. NF-kappaB is a suppressor of liver apoptosis during development and in concanavalin A (ConA)-induced T-cell-mediated hepatitis. Here we show that PKCzeta-/- mice display inhibited ConA-induced NF-kappaB activation and reduced damage in liver. As the IL-4/Stat6 pathway is necessary for ConA-induced hepatitis, we addressed here the potential role of PKCzeta in this cascade. Interestingly, the loss of PKCzeta severely attenuated serum IL-5 and liver eotaxin-1 levels, two critical mediators of liver damage. Stat6 tyrosine phosphorylation and Jak1 activation were ablated in the liver of ConA-injected PKCzeta-/- mice and in IL-4-stimulated PKCzeta-/- fibroblasts. PKCzeta interacts with and phosphorylates Jak1 and PKCzeta activity is required for Jak1 function. In contrast, Par-4-/- mice have increased sensitivity to ConA-induced liver damage and IL-4 signaling. This unveils a novel and critical involvement of PKCzeta in the IL-4/Stat6 signaling pathway in vitro and in vivo.

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