Abstract
The microsomal share of liver homogenate 75Se after injection of a tracer dose of 75SeO 3 2− was three times greater in rats fed a selenium-deficient diet than in rats fed a selenium-adequate diet. Basal levels of microsomal cytochromes P-450 and b 5 were unaffected by selenium deficiency. However, induction of these cytochromes by phenobarbital was markedly inpaired in selenium-deficient rats, whereas liver weight increase and NADPH cytochrome c reductase induction were not impaired. These data indicate that selenium is essential for phenobarbital induction of microsomal hemoproteins.
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