Metabolism of diamantane by rat liver microsomal cytochromes P-450

¹Department of Biochemistry, Charles University, Czechoslovakia.

Xenobiotica; the Fate of Foreign Compounds in Biological Systems

|October 1, 1988

Abstract:

1. Diamantane binds to liver microsomes from phenobarbital-treated rats with an apparent Ks value of 5.2 x 10(-7) mol/l. This value being lower than that obtained for perhydrophenanthrene indicates that diamantane is very strongly bound to microsomal cytochrome P-450. 2. Metabolic studies show that liver microsomes from phenobarbital-treated rats readily metabolize diamantane to mono-, di- and possibly tri-hydroxy derivatives, whereas liver microsomes from beta-naphthoflavone-induced rats do not bind this hydrocarbon or metabolize it. 3. Reconstituted cytochromes P-450 b and e were more efficient in the hydroxylation of diamantane than liver microsomes; metabolites formed by the reconstituted system do not include all the products formed by microsomes, which indicates the involvement of forms of cytochrome P-450 other than the isozymes b and e.

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Abstract:

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