Natriuretic peptide type C induces sperm attraction for fertilization in mouse.

Natriuretic peptide type C induces sperm attraction for fertilization in mouse.
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DOI:
10.1038/srep39711
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发表时间:
2017-01-05
期刊:
影响因子:
4.6
通讯作者:
Zhang M
Zhang M
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Kong N;Xu X;Zhang Y;Wang Y;Hao X;Zhao Y;Qiao J;Xia G;Zhang M

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哺乳动物精子在排卵过程中沿着输卵管峡部向壶腹进行选择性运动,这是受精的先决条件。参与选择性精子运动的因素尚不清楚。在这项研究中,我们发现小鼠壶腹的输卵管上皮在排卵的卵丘复合物(OCCs)存在下表达高水平的利钠肽C型(NPPC)。精子在鞭毛中部表达NPPC受体钠尿肽受体2 (NPR2,一种胍基环化酶)。NPPC提高了精子胞内cGMP和Ca2+水平,并通过吸引作用诱导精子在毛细血管内蓄积。重要的是,来自Npr2突变小鼠的精子不被NPPC吸引,从而阻止了体内受精。卵母细胞衍生的旁分泌因子促进壶腹Nppc mRNA的表达。因此,输卵管壶腹分泌的NPPC将精子吸引到卵母细胞,这是受精所必需的。
Mammalian spermatozoa undergo selective movement along the isthmus of the oviduct to the ampulla during ovulation, which is a prerequisite for fertilization. The factor(s) that involves in selective spermatozoa movement is still unknown. In this study, we found that the oviductal epithelium in mouse ampulla expressed high levels of natriuretic peptide type C (NPPC) in the presence of ovulated oocyte-cumulus complexes (OCCs). Spermatozoa expressed NPPC receptor natriuretic peptide receptor 2 (NPR2, a guanylyl cyclase) on the midpiece of flagellum. NPPC increased intracellular levels of cGMP and Ca2+ of spermatozoa, and induced sperm accumulation in the capillary by attraction. Importantly, spermatozoa from Npr2 mutant mice were not attracted by NPPC, preventing fertilization in vivo. Oocyte-derived paracrine factors promoted the expression of Nppc mRNA in the ampulla. Therefore, NPPC secreted by oviductal ampulla attracts spermatozoa towards oocytes, which is essential for fertilization.
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