HMGB1 Release Induced by Liver Ischemia Involves Toll-like Receptor 4 Dependent Reactive Oxygen Species Production and Calcium-mediated Signaling

Overview

Journal J Exp Med

Specialties Allergy & Immunology
General Medicine

Date 2007 Nov 7

PMID 17984303

Citations 318

Authors

Allan Tsung

John R Klune

Xianghong Zhang

Geetha Jeyabalan

Zongxian Cao

Ximei Peng

Donna B Stolz

David A Geller

Matthew R Rosengart

Timothy R Billiar

Affiliations

Soon will be listed here.

Abstract

Ischemic tissues require mechanisms to alert the immune system of impending cell damage. The nuclear protein high-mobility group box 1 (HMGB1) can activate inflammatory pathways when released from ischemic cells. We elucidate the mechanism by which HMGB1, one of the key alarm molecules released during liver ischemia/reperfusion (I/R), is mobilized in response to hypoxia. HMGB1 release from cultured hepatocytes was found to be an active process regulated by reactive oxygen species (ROS). Optimal production of ROS and subsequent HMGB1 release by hypoxic hepatocytes required intact Toll-like receptor (TLR) 4 signaling. To elucidate the downstream signaling pathways involved in hypoxia-induced HMGB1 release from hepatocytes, we examined the role of calcium signaling in this process. HMGB1 release induced by oxidative stress was markedly reduced by inhibition of calcium/calmodulin-dependent kinases (CaMKs), a family of proteins involved in a wide range of calcium-linked signaling events. In addition, CaMK inhibition substantially decreased liver damage after I/R and resulted in accumulation of HMGB1 in the cytoplasm of hepatocytes. Collectively, these results demonstrate that hypoxia-induced HMGB1 release by hepatocytes is an active, regulated process that occurs through a mechanism promoted by TLR4-dependent ROS production and downstream CaMK-mediated signaling.

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