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• W1968395770 abstract "Androgen deprivation is commonly used in the treatment of metastatic prostate cancer. The (-)-gossypol enantiomer has been demonstrated as an effective inhibitor of Bcl-2 in the treatment of prostate cancer. However, the mechanism of gossypol as an inhibitor of androgen biosynthesis is not clear. The present study compared (+)- and (-)-gossypols in the inhibition of 3beta-hydroxysteroid dehydrogenase (3beta-HSD) and 17beta-HSD isoform 3 (17beta-HSD3) in human and rat testes. Gossypol enantiomers were more potent inhibitors of rat 3beta-HSD with IC(50)s of approximately 0.2microM compared to 3-5microM in human testes. However, human 17beta-HSD3 was more sensitive to inhibition by gossypol enantiomers, with IC(50)s of 0.36+/-0.09 and 1.13+/-0.12 for (-)- and (+)-gossypols, respectively, compared to 3.43+/-0.46 and 10.93+/-2.27 in rat testes. There were species- and enantiomer-specific differences in the sensitivity of the inhibition of 17beta-HSD3. Gossypol enantiomers competitively inhibited both 3beta-HSD and 17beta-HSD3 by competing for the cofactor binding sites of these enzymes. Gossypol enantiomers, fed orally to rats (20mg/kg), inhibited 3beta-HSD but not 17beta-HSD3. This finding was consistent with the in vitro data, in which rat 3beta-HSD was more sensitive to gossypol inhibition than rat 17beta-HSD3. As the reverse was true for the human enzymes, gossypol might be useful for treating metastatic prostate cancer." @default.
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• W1968395770 date "2009-05-01" @default.
• W1968395770 modified "2023-09-27" @default.
• W1968395770 title "The (+)- and (−)-gossypols potently inhibit both 3β-hydroxysteroid dehydrogenase and 17β-hydroxysteroid dehydrogenase 3 in human and rat testes" @default.
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• W1968395770 doi "https://doi.org/10.1016/j.jsbmb.2009.02.004" @default.
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