Abstract
The effects of NADH and cyanide on NADPH-dependent acetaminophen activation in rat and mouse liver microsomes were studied. In both rat and mouse microsomes, NADPH-dependent acetaminophen- glutathione conjugate production was synergistically enhanced by the addition of NADH, whereas NADH alone did not initiate this reaction. The data suggest that the second electron in this reaction may be transferred from NADH. The present findings are different from a previous report in a reconstituted system that NADH decreases covalent binding of acetaminophen to proteins. This reaction was inhibited by low concentrations of sodium cyanide. The role of the cyanide sensitive factor in this reaction in liver microsomes remains to be further clarified.
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