title: The in vivo effect of benzamide and phenobarbital on liver enzymes: poly(ADP-ribose) polymerase, cytochrome P-450, styrene oxide hydrolase, cholesterol oxide hydrolase, glutathione S-transferase and UDP-glucuronyl transferase.
abstract: Rats fed a synthetic diet containing 0.25% benzamide, 0.1% phenobarbital, separately or in combination, for two weeks showed a significant augmentation in the activity of nuclear poly(ADP-ribose) polymerase as well as changes in various nuclear, microsomal and cytosolic liver enzymes involved in the metabolism of xenobiotics. A selective depression of microsomal styrene oxide hydrolase activity by benzamide feeding, and a contrasting augmentation by phenobarbital, were confirmed by immunological titration of the enzyme-protein content suggesting actual enzyme repression and induction. The NAD content of these livers is not altered significantly as a result of benzamide and phenobarbital feeding, indicating that the changes in enzymes are not a result of non-specific toxic effects.
mesh_terms: D015096:3-Hydroxysteroid Dehydrogenases / Q000378:metabolism*; D000818:Animals; D001549:Benzamides / Q000494:pharmacology*; D002467:Cell Nucleus / Q000201:enzymology; D002789:Cholesterol Oxidase / Q000378:metabolism*; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism*; D004851:Epoxide Hydrolases / Q000378:metabolism*; D014453:Glucuronosyltransferase / Q000378:metabolism*; D005982:Glutathione Transferase / Q000378:metabolism*; D008099:Liver / Q000187:drug effects / Q000201:enzymology*; D008297:Male; D008862:Microsomes, Liver / Q000201:enzymology; D009244:NAD+ Nucleosidase / Q000378:metabolism*; D009685:Nuclear Envelope / Q000201:enzymology; D010634:Phenobarbital / Q000494:pharmacology*; D011065:Poly(ADP-ribose) Polymerases / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D001549:Benzamides; C037689:benzamide; D003577:Cytochrome P-450 Enzyme System; D015096:3-Hydroxysteroid Dehydrogenases; D002789:Cholesterol Oxidase; D014453:Glucuronosyltransferase; D011065:Poly(ADP-ribose) Polymerases; D005982:Glutathione Transferase; D009244:NAD+ Nucleosidase; D004851:Epoxide Hydrolases; C022686:styrene oxide hydratase; D010634:Phenobarbital