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- W17491505 abstract "Objective: To compare the effect of finasteride with that of epristeride on 5(-reductase kinetics in vitro to explain the increase in serum testosterone level by finasteride but not by epristeride when treated for benign prostatic hyperplasia.Methods: Sprague-Dawley rat liver microsomal crude suspension served as the source of steroid ?(?-reductase. The enzyme, Tris-HCl buffer, [3H] testosterone and epristeride or finasteride were incubated together at 37oC for 20 min. The substrate, [3H] testosterone, and its product, [3H] dihydrotestosterone (DHT) were isolated by thin-layer chromatography. To measure the initial velocity of [3H] DHT (the activity of 5(-reductase), the radioactivity of [3H] DHT, scrapped off thin-layer plate was determined with isotope scintillation counter. The enzyme activity was expressed as (M/min of [3H] DHT.Results: Epristeride was an uncompetitive inhibitor, but finasteride was a competitive one to steroid 5(- reductase and their inhibition constants were 67 ( 19 and 25 ( 3 nM, respectively.Conclusion: The inhibition mechanism of finasteride different from epristeride perhaps was the reason for increase in serum testosterone levels in patients with benign prostatic hyperplasia treated by finasteride." @default.
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- W17491505 date "1999-03-01" @default.
- W17491505 modified "2023-09-24" @default.
- W17491505 title "Effects of finasteride and epristeride on steroid 5a-reductase kinetics-A comparative in vitro study" @default.
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