A mechanism for virilization of female spotted hyenas in utero.

A mechanism for virilization of female spotted hyenas in utero.
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雌性斑鬣狗在子宫内男性化的机制。

DOI:
10.1126/science.8391165
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发表时间:
1993
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Glickman,SE
Glickman,SE
中科院分区:
--
文献类型:
--
作者:
Yalcinkaya,TM;Siiteri,PK;Vigne,JL;Licht,P;Pavgi,S;Frank,LG;Glickman,SE

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雌性斑鬣狗表现出类似雄性的生殖器和对雄性的统治。体外培养的鬣狗卵巢组织产生大量的类固醇激素前体雄烯二酮。芳香化酶的活性,将雄烯二酮转化为雌激素,在鬣狗和人类胎盘匀浆中是二十分之一。相比之下,将雄烯二酮转化为睾酮的17β-羟基类固醇脱氢酶的活性在两种匀浆中相等。有限的芳香化酶活性可能使鬣狗胎盘将高浓度的雄烯二酮转化为睾酮,导致胎儿外生殖器男性化,并可能破坏胎儿卵泡。雄烯二酮的生产残留的卵巢基质细胞在生殖生活中占雌性斑点鬣狗男性化的表观遗传传递。
Female spotted hyenas exhibit male-like genitalia and dominance over males. Hyena ovarian tissues incubated in vitro produced large quantities of the steroid hormone precursor androstenedione. The activity of aromatase, which converts androstenedione to estrogen, was one-twentieth as great in hyena versus human placental homogenates. In comparison, the activity of 17β-hydroxysteroid dehydrogenase, which converts androstenedione to testosterone, was equal in the two homogenates. The limited aromatase activity may allow the hyena placenta to convert high circulating concentrations of androstenedione to testosterone, which results in virilization of the fetal external genitalia and possibly destruction of fetal ovarian follicles. Androstenedione production by residual ovarian stromal cells during reproductive life accounts for the epigenetic transmission of virilization in female spotted hyenas.
感觉受体和辣椒素的抗伤害作用
DOI: --
发表时间: 1985
期刊:
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