title: Inhibitory effects of beryllium chloride on rat liver microsomal enzymes.
abstract: A single i.v. dose (0.1 mmol Be2+/kg) of beryllium chloride prolonged the duration of pentobarbital-induced sleep and zoxazolamine-induced paralysis, in rats. The effects are correlated with changes of the pharmacokinetic parameters and with the in vitro inhibition of both aliphatic and aromatic hydroxylation of pentobarbital and zoxazolamine. In vitro N-demethylation of meperidine and aminopyrine was partially inhibited while O-demethylation of quinidine was unaffected by liver microsomes of rats pretreated with beryllium salt. The findings give clues that beryllium chloride inhibits some forms of cytochrome P-450, especially those responsible for hydroxylation of substrates, like pentobarbital and zoxazolamine.
authors.affiliation: Servico de Farmacologia, Instituto Butantan, São Paulo, Brazil.
authors.forename: C F
authors.initials: CF
authors.lastname: Teixeira
authors.forename: W J
authors.initials: WJ
authors.lastname: Yasaka
authors.forename: L F
authors.initials: LF
authors.lastname: Silva
authors.forename: T T
authors.initials: TT
authors.lastname: Oshiro
authors.forename: S
authors.initials: S
authors.lastname: Oga
mesh_terms: D000818:Animals; D001522:Behavior, Animal / Q000187:drug effects; D001608:Beryllium / Q000008:administration & dosage / Q000494:pharmacology*; D015786:Cytochromes b5 / Q000378:metabolism; D003864:Depression, Chemical; D006900:Hydroxylation; D007275:Injections, Intravenous; D008297:Male; D008862:Microsomes, Liver / Q000201:enzymology*; D009251:NADPH-Ferrihemoprotein Reductase / Q000378:metabolism; D010424:Pentobarbital / Q000097:blood / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D012018:Reflex / Q000187:drug effects; D012890:Sleep / Q000187:drug effects; D015049:Zoxazolamine / Q000097:blood
chemical_list: C032776:beryllium chloride; D015786:Cytochromes b5; D015049:Zoxazolamine; D009251:NADPH-Ferrihemoprotein Reductase; D010424:Pentobarbital; D001608:Beryllium