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首页> 外文期刊>The European Journal of Neuroscience >Low molecular weight constituents of male mouse urine mediate the pregnancy block effect and convey information about the identity of the mating male.
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Low molecular weight constituents of male mouse urine mediate the pregnancy block effect and convey information about the identity of the mating male.

机译:雄性小鼠尿液的低分子量成分介导了阻止妊娠作用,并传达了有关交配雄性的信息。

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摘要

Mouse urine contains a complex mixture of chemosignals including a variety of small volatile molecules that are bound to major urinary proteins. In addition to signalling maleness, male urine also conveys information about individuality, which allows recently mated female mice to distinguish the urinary chemosignals of the mating male from those of an unfamiliar male. The highly polymorphic nature of the major urinary proteins makes them a likely candidate for conveying individuality information in the context of the pregnancy block effect. This was investigated by comparing the pregnancy-blocking effectiveness of a high molecular weight urinary fraction, containing major urinary proteins, with that of a low molecular weight fraction containing volatile ligands. Not only was the high molecular weight fraction ineffective in blocking pregnancy, but it also appeared to be less important in signalling individuality than the low molecular fraction. The high molecular weight fraction was ineffective in inducing expression of the immediate early gene product egr-1 in the accessory olfactory bulb. In contrast, the low molecular weight fraction induced egr-1 expression in the mitral/tufted neurons in the anterior subregion of the accessory olfactory bulb, suggesting that they activate the V1R class of vomeronasal receptor neuron.
机译:小鼠尿液中含有复杂的化学信号混合物,其中包括与主要尿蛋白结合的各种挥发性小分子。除了发出雄性信号外,雄性尿液还传达有关个性的信息,这使最近交配的雌性小鼠能够将交配的雄性的尿化学信号与陌生的雄性的尿化学信号区分开。主要尿蛋白的高度多态性使它们成为在妊娠阻滞效应背景下传达个性信息的可能候选者。通过比较包含主要尿蛋白的高分子量尿液馏分与包含挥发性配体的低分子量馏分的阻断妊娠效果,对此进行了研究。高分子量组分不仅不能有效地阻止妊娠,而且在信号传递个性方面似乎不如低分子量组分重要。高分子量部分不能有效地诱导辅助嗅球中即刻早期基因产物egr-1的表达。相比之下,低分子量级分诱导副嗅球前亚区的二尖瓣/簇状神经元中的egr-1表达,表明它们激活了Vomer鼻类受体神经元。

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