Increased expression of toll-like receptor 4 enhances endotoxin-induced hepatic failure in partially hepatectomized mice.

Abstract

BACKGROUND/AIMS:

Liver failure associated with infections after hepatectomy remains a cause of mortality. It has recently been reported that toll-like receptor 4 (TLR4) is involved in recognizing lipopolysaccharides (LPS). The aim of this study was to investigate the role of TLR4 in endotoxin-induced liver injury after hepatectomy.

METHODS:

C3H/HeN and C3H/HeJ mice underwent 70% hepatectomy or sham surgery, and LPS was administered 48 h after surgery. Expression of TLR4 mRNA, nuclear factor-kappaB (NF-kappaB) activation, tumor necrosis factor-alpha (TNF-alpha) and serum ALT levels, histological findings, and myeloperoxidase content were examined. Survival after LPS administration was also determined.

RESULTS:

Hepatic expression of TLR4 was significantly increased 6-72 h after hepatectomy. In mice with endotoxemia after hepatectomy, hepatic NF-kappaB activation was greatly increased. Hepatic mRNA and serum levels of TNF-alpha, and ALT levels were significantly elevated compared with sham operated controls. Focal necrosis with neutrophil infiltration was apparent, which is consistent with increased myeloperoxidase contents in endotoxemia after hepatectomy in C3H/HeN mice. These were completely absent in C3H/HeJ mice. Survival of C3H/HeN mice with endotoxemia after hepatectomy was significantly lower than that of C3H/HeJ mice.

CONCLUSIONS:

Upregulated TLR4 expression and function after hepatectomy plays a pivotal role in endotoxin-induced liver injury after hepatectomy.

• Authors: Tsukasa Takayashiki, Hiroyuki Yoshidome, Fumio Kimura, Masayuki Ohtsuka, Yoshiaki Shimizu, Atsushi Kato, Hiroshi Ito, Hiroaki Shimizu, Satoshi Ambiru, Akira Togawa, Masaru Miyazaki
• Journal: Journal of hepatology (J Hepatol) Vol. 41 Issue 4 Pg. 621-8 (Oct 2004) ISSN: 0168-8278 [Print] Netherlands
• PMID: 15464243 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Chemokine CXCL2
• Chemokines
• Cxcl2 protein, mouse
• Endotoxins
• Lipopolysaccharides
• NF-kappa B
• RNA, Messenger
• Receptors, Cell Surface
• Tlr4 protein, mouse
• Toll-Like Receptor 4
• Tumor Necrosis Factor-alpha
• Peroxidase

Topics

• Animals
• Chemokine CXCL2
• Chemokines (blood, metabolism)
• Endotoxemia (blood, metabolism, pathology)
• Endotoxins
• Hepatectomy (methods)
• Lipopolysaccharides
• Liver (metabolism, pathology)
• Liver Failure (etiology, metabolism, physiopathology)
• Male
• Mice
• Mice, Inbred C3H
• NF-kappa B (metabolism)
• Peroxidase (metabolism)
• RNA, Messenger (metabolism)
• Receptors, Cell Surface (genetics, metabolism)
• Toll-Like Receptor 4
• Tumor Necrosis Factor-alpha (metabolism)