|Other names||15β-Hydroxy-CPA; 15β-OH-CPA; 6-Chloro-15β,17α-dihydroxy-1α,2α-methylenepregna-4,6-diene-3,20-dione 17α-acetate; 6-Chloro-1,2α-methylene-15β,17α-dihydroxy-δ6-progesterone 17α-acetate|
|Chemical and physical data|
|Molar mass||432.94 g·mol−1|
|3D model (JSmol)|
15β-Hydroxycyproterone acetate (15β-OH-CPA) is a steroidal antiandrogen and the major metabolite of cyproterone acetate (CPA). It is formed from CPA in the liver by hydroxylation via the cytochrome P450 enzyme CYP3A4. During therapy with CPA, 15β-OH-CPA circulates at concentrations that are approximately twice those of CPA. 15β-OH-CPA has similar or even greater antiandrogen activity compared to CPA. However, it has only about one-tenth of the activity of CPA as a progestogen. 15β-OH-CPA also shows some glucocorticoid activity, similarly to CPA and unesterified cyproterone.
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In addition, cyprosterone acetate and its main metabolite, 15β-hydroxy acetate, as well as the newly isolated free alcohol of the main metabolite were characterized for their corticosteroid-like activity in rats. Cyproterone acetate treatment of male hypersexual subjects and female rhesus monkeys did not reveal any signs of adrenal suppression. Cyproterone acetate and its metabolites gave no indication of any appreciable antiinflammatory effect in the adjuvant edema test in rats. However, there was a general increase in the level of blood glucose and liver glycogen as well as a reduction in body weight and organ weight (spleen, thymus and adrenal) in rats, in which 15β-hydroxy cyproterone was slightly more active with the exception of adrenal weight reduction, which was almost equal in all three compounds tested. It can also be concluded that adult man and rhesus monkey are much less sensitive, if at all so, to some corticosteroid-like activities of cyproterone acetate and its main metabolites than the rat.