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To investigate the stimuli required for the induction of nitric oxide synthase (NOS) in sepsis, we have analyzed the levels of this enzyme in the livers of mice infected with a 90% lethal dose of Escherichia coli in a model of gram-negative sepsis. Hepatic NOS levels are markedly induced in this model, with peak values occurring 12 to 22 h following infection. Treatment with TN3-19.12, a neutralizing monoclonal antibody to tumor necrosis factor alpha (TNF-alpha), resulted in complete protection from death in this model of sepsis but had no significant effect on the level of induction of hepatic NOS. Treatment with H22, a monoclonal antibody to gamma interferon (IFN-gamma), also gave significant protection against death and, in addition, did lead to a decrease in the level of induction of the hepatic NOS. Treatment of mice with pure TNF-alpha (0.2 microgram), IFN-gamma (2,000 U), or a combination of the two did not induce the hepatic NOS, but treatment with the combination led to significant mortality (probability of survival at 22 h, 0.32). Thus, the level of induction of NOS within the liver either in sepsis or by the coadministration of TNF-alpha and IFN-gamma does not correlate with death.

infection and immunity

Differential effects of monoclonal antibodies to tumor necrosis factor alpha and gamma interferon on induction of hepatic nitric oxide synthase in experimental gram-negative sepsis