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Published online before print October 24, 2006

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(Journal of Leukocyte Biology. 2007;81:119-128.)
© 2007 by Society for Leukocyte Biology

Increasing numbers of hepatic dendritic cells promote HMGB1-mediated ischemia-reperfusion injury

Department of Surgery, University of Pittsburgh, Pittsburgh, Pennsylvania, USA

²Correspondence: Department of Surgery, University of Pittsburgh School of Medicine, 200 Lothrop Street, Presbyterian Hospital F1200, Pittsburgh, PA 15213, USA. E-mail: billiartr{at}upmc.edu

ABSTRACT

Endogenous ligands released from damaged cells, so-called damage-associated molecular pattern molecules (DAMPs), activate innate signaling pathways including the TLRs. We have shown that hepatic, warm ischemia and reperfusion (I/R) injury, generating local, noninfectious DAMPs, promotes inflammation, which is largely TLR4-dependent. Here, we demonstrate that increasing dendritic cell (DC) numbers enhance inflammation and organ injury after hepatic I/R. High-mobility group box 1 (HMGB1), a NF released by necrotic cells or secreted by stimulated cells, is one of a number of ligands promoting TLR4 reactivity. Augmentation of DC numbers in the liver with GM-CSF hydrodynamic transfection significantly increased liver damage after I/R when compared with controls. TLR4 engagement on hepatic DC was required for the I/R-induced injury, as augmentation of DC numbers in TLR4 mutant (C3H/HeJ) mice did not worsen hepatic damage. It is interesting that TLR4 expression was increased in hepatic DC following HMGB1 stimulation in vitro, suggesting a mechanism for the increased liver injury following I/R. It thus appears that functional TLR4 on DC is required for I/R-induced injury. Furthermore, HMGB1 may direct the inflammatory responses mediated by DC, at least in part, by enhancing TLR4 expression and reactivity to it and other DAMPs.

Key Words: inflammation • Toll-like receptor 4 • liver

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