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Inactivation of rat hepatic cytochrome P-450 by spironolactone

Hair Loss Study Abstract

Administration of antimineralocorticoid spironolactone (SPL) to rats results in modest destruction of hepatic cytochrome P-450 with parallel loss of heme. This process is accentuated by pretreatment with dexamethasone (DEX), an inducer of cytochrome P-450p and is associated with marked functional loss of cytochrome P-450p-dependent hydroxylases. Cytochrome P-450 destruction may be replicated in vitro when microsomes from DEX-pretreated rats are incubated with SPL and NADPH and is impaired when these rats are given triacetyloleandomycin, an inhibitor of cytochrome P-450p. In vitro SPL-mediated cytochrome P-450 destruction is accompanied by a loss of heme, which appears to be converted to reactive intermediates which covalently bind to microsomes or are converted to polar metabolites.



Decker C; Sugiyama K; Underwood M; Correia MA



Biochem Biophys Res Commun, 136: 3, 1986 May 14, 1162-9





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