title: Inhibition of overall protein and RNA synthesis as a mechanism for the tunicamycin induced decrease in cytochrome P-450 in rat hepatocytes.
abstract: In rat hepatocytes maintained in culture, cytochrome P-450 and NADPH cytochrome c reductase activities were decreased by tunicamycin in a dose and time dependent fashion. The effect of tunicamycin was mainly due to inhibition of protein synthesis. Tunicamycin decreased L-[35S] methionine incorporation into many proteins, including a 52 kDa cytochrome P-450 isozyme. Tunicamycin also reduced RNA synthesis. These results indicate that tunicamycin decreased cytochrome P-450 levels in hepatocytes by inhibiting protein and RNA synthesis.
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D003577:Cytochrome P-450 Enzyme System / Q000096:biosynthesis*; D007700:Kinetics; D008099:Liver / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D008715:Methionine / Q000378:metabolism; D014176:Protein Biosynthesis; D012313:RNA / Q000096:biosynthesis*; D051381:Rats; D011919:Rats, Inbred Strains; D014415:Tunicamycin / Q000494:pharmacology*
chemical_list: D014415:Tunicamycin; D012313:RNA; D003577:Cytochrome P-450 Enzyme System; D008715:Methionine