title: Effect of repeated administration of monomethyl-aminoantipyrine on the activities of gamma-glutamyltranspeptidase and microsomal drug metabolizing enzymes in rat liver.
abstract: The effects of consecutive administration of 4-monomethylaminoantipyrine, a metabolite of aminopyrine, on the gamma-glutamyltranspeptidase activities of liver, kidney, urine and serum were investigated in rats. On day 5 after repeated treatment, a pronounced increase of gamma-glutamyltranspeptidase activity was seen in the liver homogenate as well as in the hepatic microsomes. Furthermore, simultaneous administration of 4-monomethylaminoantipyrine with phenobarbital increased to the same degree as compared with the single administration of aminopyrine. However, no change in gamma-glutamyltranspeptidase activity was observed in kidney, urine, serum and hepatic cytosolic fractions. Under the same experimental condition, the contents of cytochrome P-450 and b5, NADPH cytochrome c reductase, the activities of aminopyrine N-demethylase and aniline hydroxylase were also enhanced.
authors.forename: K
authors.initials: K
authors.lastname: Hoshi
authors.forename: N
authors.initials: N
authors.lastname: Senda
authors.forename: T
authors.initials: T
authors.lastname: Igarashi
authors.forename: T
authors.initials: T
authors.lastname: Satoh
authors.forename: K
authors.initials: K
authors.lastname: Ueno
authors.forename: H
authors.initials: H
authors.lastname: Kitagawa
mesh_terms: D000632:Aminopyrine / Q000031:analogs & derivatives* / Q000378:metabolism; D000818:Animals; D001835:Body Weight / Q000187:drug effects; D003577:Cytochrome P-450 Enzyme System / Q000032:analysis; D004177:Dipyrone / Q000031:analogs & derivatives* / Q000494:pharmacology; D066298:In Vitro Techniques; D007668:Kidney / Q000187:drug effects; D008099:Liver / Q000187:drug effects* / Q000201:enzymology; D008297:Male; D008862:Microsomes, Liver / Q000201:enzymology; D009929:Organ Size / Q000187:drug effects; D010634:Phenobarbital / Q000494:pharmacology; D011506:Proteins / Q000032:analysis; D047069:Pyrazolones; D051381:Rats; D011919:Rats, Inbred Strains; D005723:gamma-Glutamyltransferase / Q000032:analysis*
chemical_list: D011506:Proteins; D047069:Pyrazolones; D000632:Aminopyrine; D004177:Dipyrone; D003577:Cytochrome P-450 Enzyme System; D005723:gamma-Glutamyltransferase; C008667:noramidopyrine; D010634:Phenobarbital