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Am J Physiol Regul Integr Comp Physiol 278: R1196-R1201, 2000;
0363-6119/00 $5.00
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Vol. 278, Issue 5, R1196-R1201, May 2000

Lipopolysaccharide and D-galactosamine-induced hepatic injury is mediated by TNF-alpha and not by Fas ligand

Michael D. Josephs1, F. Rena Bahjat1, Kunitaro Fukuzuka1, Riadh Ksontini1, Carmen C. Solorzano1, Carl K. Edwards III2, Cynthia L. Tannahill1, Sally L. D. MacKay1, Edward M. Copeland III, and Lyle L. Moldawer1

1 Department of Surgery, University of Florida College of Medicine, Gainesville, Florida 32610; and 2 Amgen, Thousand Oaks, California 91320

Tumor necrosis factor (TNF)-alpha and Fas ligand (FasL) are trimeric proteins that induce apoptosis through similar caspase-dependent pathways. Hepatocytes are particularly sensitive to inflammation-induced programmed cell death, although the contribution of TNF-alpha and/or FasL to this injury response is still unclear. Here, we report that D-galactosamine and lipopolysaccharide-induced liver injury in C57BL/6 mice is associated with increased hepatic expression of both TNF-alpha and FasL mRNA. Pretreatment of mice with a TNF-binding protein improved survival, reduced plasma aspartate aminotransferase concentrations, and attenuated the apoptotic liver injury, as determined histologically and by in situ 3' OH end labeling of fragmented nuclear DNA. In contrast, pretreatment of mice with a murine-soluble Fas fusion protein (Fasfp) had only minimal effect on survival, and apoptotic liver injury was either unaffected or exacerbated depending on the dose of Fasfp employed. Similarly, mice with a spontaneous mutation in FasL (B6Smn.C3H-Faslgld derived from C57BL/6) were equally sensitive to D-galactosamine/lipopolysaccharide-induced shock. We conclude that the shock and apoptotic liver injury after D-galactosamine/lipopolysaccharide treatment are due primarily to TNF-alpha release, whereas increased FasL expression appears to contribute little to the mortality and hepatic injury.

apoptosis; hepatitis; sepsis; shock


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