Sex differences in the neural circuit that mediates female sexual receptivity.

Sex differences in the neural circuit that mediates female sexual receptivity.
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DOI:
10.1016/j.yfrne.2011.02.008
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发表时间:
2011-04
影响因子:
7.4
通讯作者:
Flanagan-Cato, Loretta M.
Flanagan-Cato, Loretta M.
中科院分区:
医学1区
文献类型:
--
作者:
Flanagan-Cato, Loretta M.

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啮齿类动物的雌性性行为,以脊柱前凸姿势为代表,具有性别特异性和性别依赖性。卵巢激素通过下丘脑腹内侧核(VMH)中的受体控制这种行为。本文综述了VMH的形态学、神经化学和神经回路的性别差异,以深入了解控制脊柱前凸的机制。由于更多的突触连接,男性的VMH比女性大。另一个性别差异是对雌二醇的反应,与女性相比,男性表现出沉默,在某些情况下,相反的影响。男性缺乏脊柱前凸可能是由于VMH中突触组织或雌激素反应性的差异,或两者兼而有之。然而,考虑到大脑其他区域的损伤会暴露男性的脊柱前凸行为,男性典型的VMH不太可能是防止脊柱前凸的主要因素。在女性中,关于卵巢激素调节VMH功能以促进脊柱前凸的机制仍然存在关键问题。
Female sexual behavior in rodents, typified by the lordosis posture, is hormone-dependent and sex-specific. Ovarian hormones control this behavior via receptors in the hypothalamic ventromedial nucleus (VMH). This review considers the sex differences in the morphology, neurochemistry and neural circuitry of the VMH to gain insights into the mechanisms that control lordosis. The VMH is larger in males compared with females, due to more synaptic connections. Another sex difference is the responsiveness to estradiol, with males exhibiting muted, and in some cases reverse, effects compared with females. The lack of lordosis in males may be explained by differences in synaptic organization or estrogen responsiveness, or both, in the VMH. However, given that damage to other brain regions unmasks lordosis behavior in males, a male-typical VMH is unlikely the main factor that prevents lordosis. In females, key questions remain regarding the mechanisms whereby ovarian hormones modulate VMH function to promote lordosis.
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