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Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261
Whereas nitric oxide (NO)
produced by constitutive endothelial NO synthase is protective to the
liver, NO produced by the inducible NO synthase (iNOS) can be either
toxic or protective depending on the conditions. The availability of
selective iNOS inhibitors and mice lacking various NOS isoforms made it
possible to begin to elucidate the precise roles of NO in the liver.
Under conditions of redox stress, induced NO contributes to hepatic damage. However, in acute inflammatory conditions associated with cytokine exposure, NO acts as a potent inhibitor of apoptosis in the
liver. Our current understanding of the mechanisms by which NO exerts
both hepatoprotective and hepatotoxic actions is discussed in this
themes article.
inducible nitric oxide synthase; apoptosis; caspases; peroxynitrite
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