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Interactions of an anti-androgen (cyproterone acetate) with the androgen receptor system and its biological action in the rat ventral prostate

Interactions of an anti-androgen (cyproterone acetate) with the androgen receptor system and its biological action in the rat ventral prostate

Acta Endocrinologica 109(4): 569-576

Male Wistar rats were castrated and implantated with testosterone-filled silastic depots (in vitro release rate: 60 micrograms/24 h) prior to treatment with 10 mg cyproterone acetate (CyAc) on day 1, and 5 mg on days 4, 7, 10 and 13. Animals were sacrificed on day 14. Control animals were treated identically, with the exception of CyAc administration. Blood was collected and the ventral prostates of 6-8 animals were pooled, homogenized and processed into cytosol and purified nuclei. Steroid determinations (CyAc, testosterone, 5 alpha-dihydrotestosterone (DHT), 5 alpha-androstane-3 alpha,17 beta-diol (3 alpha-diol)) were performed by RIA. Specifically bound DHT (charcoal resistant DHT = CR-DHT) represents DHT values (RIA) following treatment of cytosol or nuclear extract with dextran coated charcoal. The androgen receptor was determined in cytosol and nuclear extract by 'exchange assay' using [3H]methyltrienolone (MT) (18 h, 15 degrees C). The main results were: 1) The steroid levels in plasma (testosterone, DHT, 3 alpha-diol) were in the range of untreated adult animals and not significantly influenced by the CyAc treatment. Final CyAc levels were 305 +/- 58 nmol/l (mean +/- SD, n = 5).

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Accession: 040469237

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PMID: 2930988

DOI: 10.1530/acta.0.1090569

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