The gap junctional protein INX-14 functions in oocyte precursors to promote C. elegans sperm guidance.

The gap junctional protein INX-14 functions in oocyte precursors to promote C. elegans sperm guidance.
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DOI:
10.1016/j.ydbio.2011.08.014
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发表时间:
2011-11-01
影响因子:
2.7
通讯作者:
Miller MA
Miller MA
中科院分区:
生物学3区
文献类型:
--
作者:
Edmonds JW;McKinney SL;Prasain JK;Miller MA

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内联蛋白是无脊椎动物缝隙连接的亚基。在这里,我们发现innexin INX-14促进精子引导到线虫两性生殖道中的受精部位。INX-14基因缺失会导致细胞在精子迁移速度和定向速度方面出现非自主缺陷。遗传和免疫细胞化学分析的结果提供了强有力的证据,表明INX-14作用于远端性腺转录活跃的卵母细胞前体,而不是合成前列腺素吸引精子信号的转录不活跃卵母细胞。INX-14可能通过在鞘细胞中表达的INX-8和INX-9的表达而与性腺鞘细胞相互作用。然而,电子显微镜没有发现卵母细胞前体细胞中的缝隙连接,这表明INX-14以通道无关的方式发挥作用,或者INX-14通道很难被记录下来。在卵母细胞合成F系列前列腺素之后,INX-14促进前列腺素信号传递给精子。综上所述,我们的结果支持INX-14在对精子功能至关重要的体细胞性腺/生殖细胞信号机制中发挥作用的模型。我们认为,这一机制调节一种因子(S)的转录,该因子调节前列腺素在生殖道中的代谢、运输或活动。
Innexins are the subunits of invertebrate gap junctions. Here we show that the innexin INX-14 promotes sperm guidance to the fertilization site in the C. elegans hermaphrodite reproductive tract. inx-14 loss causes cell nonautonomous defects in sperm migration velocity and directional velocity. Results from genetic and immunocytochemical analyses provide strong evidence that INX-14 acts in transcriptionally active oocyte precursors in the distal gonad, not in transcriptionally inactive oocytes that synthesize prostaglandin sperm-attracting cues. Somatic gonadal sheath cell interaction is necessary for INX-14 function, likely via INX-8 and INX-9 expressed in sheath cells. However, electron microscopy has not identified gap junctions in oocyte precursors, suggesting that INX-14 acts in a channel-independent manner or INX-14 channels are difficult to document. INX-14 promotes prostaglandin signaling to sperm at a step after F-series prostaglandin synthesis in oocytes. Taken together, our results support the model that INX-14 functions in a somatic gonad/germ cell signaling mechanism essential for sperm function. We propose that this mechanism regulates the transcription of a factor(s) that modulates prostaglandin metabolism, transport, or activity in the reproductive tract.
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