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首页> 外文期刊>The Journal of Neuroscience: The Official Journal of the Society for Neuroscience >Social influences on the arginine vasotocin system are independent of gonads in a sex-changing fish.
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Social influences on the arginine vasotocin system are independent of gonads in a sex-changing fish.

机译：对精氨酸血管收缩素系统的社会影响与变性鱼中的性腺无关。

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摘要

Many neuropeptide systems subserving sex-typical behavior are dependent on sex steroids for both their organization early in life and activation during maturity. The arginine vasopressin/vasotocin (AVP/AVT) system is strongly androgen dependent in many species and critically mediates responses to sociosexual stimuli. The bluehead wrasse is a teleost fish that exhibits a female-to-male sex change in response to social cues, and neither the development nor the maintenance of male-typical behavior depends on the presence of gonads. To examine social and gonadal inputs on the AVP/AVT system in the preoptic area (POA) of the hypothalamus, we conducted three field experiments. In the first experiment, we found that AVT mRNA abundance is higher in sex-changing females that attain social dominance and display dominant male behavior than in subordinate females, regardless of whether the dominant females were intact or ovariectomized. However, AVT-immunoreactive (IR) soma size in the gigantocellular POA (gPOA), but not in the magnocellular or parvocellular POA, increased only when females were displaying both dominant male behavior and had developed testes. In the second experiment, castration of dominant terminal-phase males had no effect on AVT mRNA abundance or any behavior we measured but did increase gPOA AVT-IR soma size compared with sham-operated controls. In the third experiment, 11-ketotestosterone implants in socially subordinate, ovariectomized females had no effect on either AVT mRNA abundance or AVT-IR soma size compared with controls. These results demonstrate that the AVT neural phenotype in the bluehead wrasse can be strongly influenced by social status, and that these social influences can be manifested independent of gonads.
机译：维持性行为的许多神经肽系统都依赖于性类固醇，因为它们在生命的早期和成熟时都会被激活。精氨酸血管加压素/血管收缩素（AVP / AVT）系统在许多物种中都强烈依赖雄激素，并且可以关键地介导对社会性刺激的反应。蓝头濑鱼是一种硬骨鱼，会根据社交线索表现出雌性到雄性的变化，而雄性行为的发展和维持都不取决于性腺的存在。为了检查下丘脑视前区（POA）中AVP / AVT系统上的社交和性爱输入，我们进行了三个野外实验。在第一个实验中，我们发现在具有社会主导地位并表现出男性主导行为的变性女性中，AVT mRNA的丰度要高于从属女性，而无论女性是完整的还是去卵巢的。但是，仅当女性同时表现出男性主导性行为和已发展出睾丸的情况时，大细胞POA（gPOA）中的AVT免疫反应（IR）体型却增加了，而在巨细胞或小细胞POA中则没有。在第二个实验中，去势占优势的末期雄性cast割对AVT mRNA的丰度或我们测量的任何行为均没有影响，但与假手术对照组相比，确实增加了gPOA AVT-IR的体细胞大小。在第三个实验中，与对照相比，在从属社会，卵巢切除的女性中植入11-酮睾酮对AVT mRNA丰度或AVT-IR体大小均无影响。这些结果表明，蓝头濑鱼中的AVT神经表型可以受到社会地位的强烈影响，并且这些社会影响可以独立于性腺而表现出来。

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