Sexually dimorphic regulation of inhibin beta B in establishing gonadal vasculature in mice.

Sexually dimorphic regulation of inhibin beta B in establishing gonadal vasculature in mice.
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抑制素β B 在建立小鼠性腺脉管系统中的性别二态性调节。

DOI:
10.1095/biolreprod.105.050286
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发表时间:
2006
影响因子:
3.6
通讯作者:
Holthusen,Kirsten
Holthusen,Kirsten
中科院分区:
生物学2区
文献类型:
--
作者:
Yao,HumphreyHung-Chang;Aardema,Jorie;Holthusen,Kirsten

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性腺的两性分化是通过正调节因子和负调节因子之间的平衡相互作用来完成的。性腺分化的最早特征之一是脉管系统的不同模式。男性特有的体腔血管在 XY 性腺的前部到后部发育,而该血管在 XX 性腺中不存在。据推测,睾丸决定基因Sry控制体腔血管的形成,但确切的分子机制仍不清楚。在这里,我们揭示了抑制素 β B 在建立性别特异性性腺脉管系统中的新作用。在睾丸中,抑制素 β B 有助于体腔血管的正确形成,体腔血管是一种男性特有的动脉,对于睾丸发育以及发育后期的激素运输至关重要。另一方面,在卵巢中,抑制素 β B 受到 WNT4 及其下游靶卵泡抑素的抑制,导致体腔血管的缺失。当 Wnt4 或卵泡抑素失活时,体腔血管异位出现在 XX 卵巢中。然而,当在Wnt4无效或卵泡抑素无效的背景中也去除抑制素βB时,正常的卵巢发育得到恢复并且没有发现体腔血管。我们的结果表明,体腔血管的性别特异性形成是由睾丸中的阳性成分以及来自卵巢的拮抗途径建立的。抑制素 beta B 战略性地位于这些相反途径的交叉点。
Sexually dimorphic differentiation of gonads is accomplished through balanced interactions between positive and negative regulators. One of the earliest features of gonadal differentiation is the divergent patterning of the vasculature. A male-specific coelomic vessel develops on the anterior to posterior of the XY gonad, whereas this vessel is absent in XX gonads. It is postulated that the testis-determining geneSrycontrols formation of the coelomic vessel, but the exact molecular mechanism remains unknown. Here we reveal a novel role for inhibin beta B in establishing sex-specific gonad vasculature. In the testis, inhibin beta B contributes to proper formation of the coelomic vessel, a male-specific artery critical for testis development and, later in development, hormone transportation. On the other hand, in the ovary, inhibin beta B is repressed by WNT4 and its downstream target follistatin, leading to the absence of the coelomic vessel. When eitherWnt4or follistatin was inactivated, the coelomic vessel appeared ectopically in the XX ovary. However, when inhibin beta B was also removed in either theWnt4-null or follistatin-null background, normal ovarian development was restored and no coelomic vessel was found. Our results indicate that the sex-specific formation of the coelomic vessel is established by positive components in the testis as well as an antagonizing pathway from the ovary. Inhibin beta B is strategically positioned at the intersection of these opposing pathways.
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