Histamine and 1-methyl-6,7-dihydroxy-1,2,3,4-tetrahydroisoquinoline are competitive inhibitors of debrisoquine 4-monooxygenase in rat liver. 1993

K Iwahashi, and Y Matsuo, and Y Tsuneoka, and Y Ichikawa, and K Hosokawa, and H Suwaki
Department of Psychiatry, Kagawa Medical School, Japan.

The effects of histamine and 1-methyl-6,7-dihydroxy-1,2,3,4- tetrahydroisoquinoline(salsolinol) on debrisoquine 4-monooxygenation, which is catalyzed by cytochrome P-450db 1 (CYP2D1) in rat liver microsomes, were studied. Both histamine and salsolinol competitively inhibited the activity of debrisoquine 4-monooxygenase (Ki = 0.31 and 0.43 mM, respectively). These data demonstrate that histamine and salsolinol bind to the active site of CYP2D1, i.e. histamine and salsolinol have structures (molecular shape) corresponding to the active site of CYP2D1.

UI MeSH Term Description Entries
D007546 Isoquinolines A group of compounds with the heterocyclic ring structure of benzo(c)pyridine. The ring structure is characteristic of the group of opium alkaloids such as papaverine. (From Stedman, 25th ed)
D008099 Liver A large lobed glandular organ in the abdomen of vertebrates that is responsible for detoxification, metabolism, synthesis and storage of various substances. Livers
D008297 Male Males
D002384 Catalysis The facilitation of a chemical reaction by material (catalyst) that is not consumed by the reaction. Catalyses
D006632 Histamine An amine derived by enzymatic decarboxylation of HISTIDINE. It is a powerful stimulant of gastric secretion, a constrictor of bronchial smooth muscle, a vasodilator, and also a centrally acting neurotransmitter. Ceplene,Histamine Dihydrochloride,Histamine Hydrochloride,Peremin
D006899 Mixed Function Oxygenases Widely distributed enzymes that carry out oxidation-reduction reactions in which one atom of the oxygen molecule is incorporated into the organic substrate; the other oxygen atom is reduced and combined with hydrogen ions to form water. They are also known as monooxygenases or hydroxylases. These reactions require two substrates as reductants for each of the two oxygen atoms. There are different classes of monooxygenases depending on the type of hydrogen-providing cosubstrate (COENZYMES) required in the mixed-function oxidation. Hydroxylase,Hydroxylases,Mixed Function Oxidase,Mixed Function Oxygenase,Monooxygenase,Monooxygenases,Mixed Function Oxidases,Function Oxidase, Mixed,Function Oxygenase, Mixed,Oxidase, Mixed Function,Oxidases, Mixed Function,Oxygenase, Mixed Function,Oxygenases, Mixed Function
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D001665 Binding Sites The parts of a macromolecule that directly participate in its specific combination with another molecule. Combining Site,Binding Site,Combining Sites,Site, Binding,Site, Combining,Sites, Binding,Sites, Combining
D001667 Binding, Competitive The interaction of two or more substrates or ligands with the same binding site. The displacement of one by the other is used in quantitative and selective affinity measurements. Competitive Binding
D017208 Rats, Wistar A strain of albino rat developed at the Wistar Institute that has spread widely at other institutions. This has markedly diluted the original strain. Wistar Rat,Rat, Wistar,Wistar Rats

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