Testosterone, androstenedione, and 5α-dihydrotestosterone on male sexual behavior and penile spines in the hamster
- 作者：M. Arteaga-Silva ; R.M. Vigueras-Villaseñ ; or ; S. Retana-Má ; rquez ; M. Herná ; ndez-Gonzá ; lez ; C. Chihuahua-Serrano ; H. Bonilla-Jaime ; J.L. Contreras ; G. Moralí
- 关键词：Golden hamsters ; Androgens ; Androstenedione ; Male sexual behavior ; Long intromissions ; Penile spines
- 刊名：Physiology and Behavior
- 出版年：2008
- 期刊代码：220_00319384
- 类别：med
- 出版时间：9 June 2008
- 卷：94
- 期：3
- 页码：412-421
- 文件大小：491 K
摘要
Testosterone, androstenedione, and 5mg src="http://www.sciencedirect.com/scidirimg/entities/204e.gif" alt="greek small letter alpha" title="greek small letter alpha" border="0">-dihydrotestosterone on male sexual behavior and penile spines in the hamster. PHYSIOL BEHAV XX(6) 000-000, 2007. — The expression of masculine sexual behavior (MSB) in male hamsters is optimally stimulated by aromatizable androgens like androstenedione (AD) and testosterone (T), while the non-aromatizable androgen, 5mg src="http://www.sciencedirect.com/scidirimg/entities/204e.gif" alt="greek small letter alpha" title="greek small letter alpha" border="0">-dihydrotestosterone (DHT), exerting potent androgenic peripheral effects, only in high doses maintains MSB after castration. No data exist on the ability of these androgens to restore long intromissions after castration. In this study, AD, T, and DHT were administered to four-week gonadectomized, sexually experienced male hamsters, for three weeks, in doses of 25 μg/day or up to 1000 μg/day to compare their potency in restoring MSB, penile size, and penile spines growth. Plasma levels of these steroids and the metabolites estrone and estradiol, were determined at the end of the treatment period. Gonadectomy completely suppressed MSB and induced a regression of penile spines. AD was more potent than T in restoring MSB, ejaculatory behavior being displayed by most castrated subjects with a lower dose of AD (50 μg/day) than of T (300 μg/day), and long intromissions being shown by all AD-treated castrated hamsters but only by 20%of T-treated ones, when doses of 1000 μg/day were given. DHT did not stimulate any copulatory response. The three androgens, even at the lowest dose, partially stimulated penis and penile epithelium growth, DHT showing the highest potency. Treatment of castrated hamsters with AD (50 μg/day), restored steroid levels to similar values as those of intact animals. These results show that AD and T restored MSB even with a partial stimulation of penile spines growth, AD being more potent than T. In contrast, DHT did not restore MSB in the hamster in spite of its peripheral androgenic potency.