title: Tissue-specific expression of rat mRNAs homologous to cytochromes P-450b and P-450e.
abstract: The tissue-specific expression of cytochrome P-450b and P-450e mRNAs was examined with synthetic 18-mer oligomer probes in the liver, lung, kidney, and testis of control and inducer pretreated adult rats. RNAs homologous to the P-450e probe were detected in trace amounts in control and 3-methylcholanthrene (MC) induced livers and at high levels in livers from phenobarbital (PB) induced animals. P-450e mRNA levels were below detection limits in the other tissues examined, regardless of pretreatment. In contrast, mRNAs homologous to the P-450b oligomer were detected at low levels in control and inducer pretreated lung and testis, and at high levels in PB induced liver. No P-450b mRNAs were detected in these assays in RNA isolates from the kidney or from control or MC pretreated liver. Solution hybridization data indicated that the rat lung contained 9-12%, and the testis, 6-9%, respectively, of the levels of P-450b mRNA measured in the PB induced liver. Results from oligo(dT)-cellulose and poly(U)-affinity experiments indicated that the hepatic mRNAs for P-450b and P-450e were present predominantly in the bound, polyadenylated fraction, whereas the homologous lung and testes P-450b mRNAs predominated in the flow-thru fractions.
mesh_terms: D003577:Cytochrome P-450 Enzyme System / Q000235:genetics*; D005786:Gene Expression Regulation / Q000187:drug effects; D007668:Kidney / Q000502:physiology; D008099:Liver / Q000502:physiology; D008168:Lung / Q000502:physiology; D008297:Male; D008748:Methylcholanthrene / Q000494:pharmacology; D006899:Mixed Function Oxygenases / Q000235:genetics*; D010634:Phenobarbital / Q000494:pharmacology; D012333:RNA, Messenger / Q000235:genetics; D013737:Testis / Q000502:physiology
chemical_list: D012333:RNA, Messenger; D008748:Methylcholanthrene; D003577:Cytochrome P-450 Enzyme System; D006899:Mixed Function Oxygenases; D010634:Phenobarbital