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and not by Fas ligand
1 Department of Surgery, University of Florida College of Medicine, Gainesville, Florida 32610; and 2 Amgen, Thousand Oaks, California 91320
Tumor necrosis factor (TNF)-
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-
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-
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-
release, whereas increased FasL expression appears
to contribute little to the mortality and hepatic injury.
apoptosis; hepatitis; sepsis; shock
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