Abstract

The effect of an infection in mice with a murin hepatitis virus Buescher type (MHVB) on the liver microsomal drug metabolizing enzymes is investigated, alone, as well as in combination with phenobarbital pretreatment. A diphasic effect of the infection with MHVB on the microsomal drug-metabolizing enzymes is observed: the enzyme activity is slightly increased 12 hr after the infection and is markedly depressed 48–60 hr after. The effect of phenobarbital pretreatment on the microsomal drug metabolizing enzymes is markedly enhanced in mice infected 12 or 24 hr previously. These results suggest that the condition of stimulated biosynthesis of protein and RNA in the liver of infected mice may enhance the effect of phenobarbital.

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