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Abstract
1.Diamantane binds to liver microsomes from phenobarbital-treated rats with an apparent K's value of 5.2 × 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 β-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.