Apoptotic cell death in the response of D-galactosamine-sensitized mice to lipopolysaccharide as an experimental endotoxic shock model

Abstract

The apoptotic cell death induced in D-galactosamine-sensitized mice by administration of lipopolysaccharide was characterized. Administration of lipopolysaccharide caused apoptotic cell death in livers of D-galactosamine- sensitized mice. Apoptotic cells were also detected in the kidney, thymus, spleen, and lymph node. Severe hepatic apoptosis in n-galactosamine- sensitized mice was reproduced by transfer of the sera from mice injected with D-galactosamine and lipopolysaccharide. The hepatocyte apoptosis induced by lipopolysaccharide was completely prevented by an anti-tumor necrosis factor alpha antibody but not by an anti-gamma interferon antibody. Administration of recombinant tumor necrosis factor alpha into D- galactosamine-sensitized mice also caused hepatocyte apoptosis. Lipopolysaccharide-induced hepatocyte apoptosis in D-galactosamine-sensitized mice did not seem to be mediated by Fas antigen. It was suggested that lipopolysaccharide-induced hepatic injury and failure in D-galactosamine- sensitized mice was due to the apoptotic cell death of hepatocytes caused by tumor necrosis factor alpha released in the circulation.