title: Circadian changes of cytochrome P-450-dependent monooxygenase system in the rat liver.
abstract: Circadian changes in cytochrome P-450 and cytochrome b5 content and activity of NADPH-cytochrome P-450 and NADH-cytochrome b5 reductases have been studied in rat liver microsomes in season autumn. The obtained results indicate, that cytochrome P-450 in 6-month-old animals shows 12 h rhythm, but in older ones 24 h rhythm. NADPH-cytochrome P-450 reductase activity shows 24 h rhythm in oldest animals only. Cytochrome b5 and its reductase has 24 h rhythm in all examined groups of rats.
authors.affiliation: Second Department of Histology and Embryology, Silesian School of Medicine, Katowice-Ligota, Poland.
authors.forename: A
authors.initials: A
authors.lastname: Plewka
authors.forename: P
authors.initials: P
authors.lastname: Czekaj
authors.forename: M
authors.initials: M
authors.lastname: Kamiński
authors.forename: D
authors.initials: D
authors.lastname: Plewka
mesh_terms: D000375:Aging / Q000378:metabolism; D000818:Animals; D002940:Circadian Rhythm; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism*; D003579:Cytochrome Reductases / Q000378:metabolism*; D042966:Cytochrome-B(5) Reductase; D015786:Cytochromes b5 / Q000378:metabolism; D008297:Male; D008862:Microsomes, Liver / Q000201:enzymology*; D009251:NADPH-Ferrihemoprotein Reductase / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar
chemical_list: D015786:Cytochromes b5; D003577:Cytochrome P-450 Enzyme System; D003579:Cytochrome Reductases; D042966:Cytochrome-B(5) Reductase; D009251:NADPH-Ferrihemoprotein Reductase