Nuclear ADP-ribosyl transferase activity correlates with induction of P-450 monooxygenases by phenobarbital in rat liver microsomes

Abstract
The effect of phenobarbital treatment on the nuclear ADP-ribosyltransferase activity has been studied in parallel with microsomal cytochrome P-450 concentration and related mono-oxygenase activities, in rat liver. A marked activation of the ADP-ribosyltransferase was observed 24 h after phenobarbital administration. The chronological study performed between 0-6 days after phenobarbital treatment showed a sharp increase in this nuclear enzyme activity, to .apprxeq. 270% of the control value produced in 48 h. The administration of 5''-methylnicotinamide in vivo, an inhibitor of ADP-ribosyltransferase activity in vitro, produced a decrease both of the induction of liver microsomal cytochrome P-450 mono-oxygenases and nuclear ADP-ribosyltransferase activity. The role of nuclear ADP-ribosyltransferase in the adaptative response of the liver cell to phenobarbital is discussed.

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