Hepatic macrophage iron aggravates experimental alcoholic steatohepatitis

Shigang Xiong, Hongyun She, An-Sheng Zhang, Jiaohong Wang, Hasmik Mkrtchyan, Alla Dynnyk, Victor R. Gordeuk, Samuel W. French, Caroline Enns, Hidekazu Tsukamoto

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

One prime feature of alcoholic liver disease (ALD) is iron accumulation in hepatic macrophages/Kupffer cells (KC) associated with enhanced NF-κB activation. Our recent work demonstrates a peroxynitrite-mediated transient rise in intracellular labile iron (ILI) as novel signaling for endotoxin-induced IKK and NF-κB activation in rodent KC. The present study investigated the mechanism of KC iron accumulation and its effects on ILI response in experimental ALD. We also tested ILI response in human blood monocytes. Chronic alcohol feeding in rats results in increased expression of transferrin (Tf) receptor-1 and hemochromatosis gene (HFE), enhanced iron uptake, an increase in nonheme iron content, and accentuated ILI response for NF-κB activation in KC. Ex vivo treatment of these KC with an iron chelator abrogates the increment of iron content, ILI response, and NF-κB activation. The ILI response is evident in macrophages derived from human blood monocytes by PMA treatment but not in vehicle-treated monocytes, and this differentiation-associated phenomenon is essential for maximal TNF-α release. PMA-induced macrophages load iron dextran and enhance ILI response and TNF-α release. These effects are reproduced in KC selectively loaded in vivo with iron dextran in mice and more importantly aggravate experimental ALD. Our results suggest enhanced iron uptake as a mechanism of KC iron loading in ALD and demonstrate the ILI response as a function acquired by differentiated macrophages in humans and as a priming mechanism for ALD.

Original languageEnglish (US)
JournalAmerican Journal of Physiology - Gastrointestinal and Liver Physiology
Volume295
Issue number3
DOIs
StatePublished - Sep 2008

Fingerprint

Alcoholic Fatty Liver
Iron
Macrophages
Liver
Kupffer Cells
Alcoholic Liver Diseases
Monocytes
Dextrans

Keywords

  • HFE
  • IKK
  • Labile iron
  • NF-κB
  • TNF-α
  • Transferrin receptor-1

ASJC Scopus subject areas

  • Gastroenterology
  • Physiology (medical)
  • Physiology
  • Hepatology

Cite this

Hepatic macrophage iron aggravates experimental alcoholic steatohepatitis. / Xiong, Shigang; She, Hongyun; Zhang, An-Sheng; Wang, Jiaohong; Mkrtchyan, Hasmik; Dynnyk, Alla; Gordeuk, Victor R.; French, Samuel W.; Enns, Caroline; Tsukamoto, Hidekazu.

In: American Journal of Physiology - Gastrointestinal and Liver Physiology, Vol. 295, No. 3, 09.2008.

Research output: Contribution to journalArticle

Xiong, Shigang ; She, Hongyun ; Zhang, An-Sheng ; Wang, Jiaohong ; Mkrtchyan, Hasmik ; Dynnyk, Alla ; Gordeuk, Victor R. ; French, Samuel W. ; Enns, Caroline ; Tsukamoto, Hidekazu. / Hepatic macrophage iron aggravates experimental alcoholic steatohepatitis. In: American Journal of Physiology - Gastrointestinal and Liver Physiology. 2008 ; Vol. 295, No. 3.
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