title: Rat liver DT-diaphorase: regulation of functional mRNA levels by 3-methylcholanthrene, trans-stilbene oxide, and phenobarbital.
abstract: Total liver poly(A+)-RNA isolated from untreated, and 3-methylcholanthrene-, trans-stilbene oxide-, and phenobarbital-treated rats has been translated in the rabbit reticulocyte lysate system in order to determine the effect of these xenobiotics on the level of translationally active DT-diaphorase mRNA. The in vitro translation systems were subjected to immunoprecipitation with rabbit IgG raised against purified DT-diaphorase and subjected to sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The identity of the radiolabeled, immunoprecipitated product as DT-diaphorase was confirmed by limited peptide mapping using Staphylococcus aureus V-8 protease. These quantitation results demonstrate that 3-methylcholanthrene leads to an eight-fold elevation in functional DT-diaphorase mRNA at 8 h after a single administration of 3-methylcholanthrene; whereas, trans-stilbene oxide and phenobarbital produced only a modest elevation, two- to three-fold, in the functional DT-diaphorase mRNA level. These data indicate that the increase in the level of DT-diaphorase after 3-methylcholanthrene administration noted previously [B. Höjeberg, K. Blomberg, S. Stenberg, and C. Lind (1981) Arch. Biochem. Biophys. 207, 205-216] can be totally accounted for by an elevation in the mRNA level specific for this protein.
mesh_terms: D000818:Animals; D002474:Cell-Free System; D004591:Electrophoresis, Polyacrylamide Gel; D004790:Enzyme Induction / Q000187:drug effects; D007120:Immunochemistry; D008099:Liver / Q000201:enzymology*; D008748:Methylcholanthrene / Q000494:pharmacology*; D016660:NAD(P)H Dehydrogenase (Quinone); D009247:NADH, NADPH Oxidoreductases / Q000096:biosynthesis*; D010634:Phenobarbital / Q000494:pharmacology*; D011808:Quinone Reductases / Q000096:biosynthesis* / Q000235:genetics; D012333:RNA, Messenger / Q000096:biosynthesis*; D011817:Rabbits; D051381:Rats; D013267:Stilbenes / Q000494:pharmacology*
chemical_list: D012333:RNA, Messenger; D013267:Stilbenes; D008748:Methylcholanthrene; D009247:NADH, NADPH Oxidoreductases; D016660:NAD(P)H Dehydrogenase (Quinone); D011808:Quinone Reductases; C025906:stilbene oxide; D010634:Phenobarbital