首页> 外文期刊>Cell biology international. >The role of inducible nitric oxide synthase in gamete interaction and fertilization: a comparative study on knockout mice of three NOS isoforms.
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The role of inducible nitric oxide synthase in gamete interaction and fertilization: a comparative study on knockout mice of three NOS isoforms.

机译:诱导型一氧化氮合酶在配子相互作用和受精中的作用:三种NOS亚型基因敲除小鼠的比较研究。

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摘要

Nitric oxide (NO), which is produced from l-arginine by three isoforms of NO synthase (NOS), has been implicated in reproductive functions. However, the specific role of NOS isoforms in gamete function and fertilization is not clear. Three types of NOS knockout mice were super ovulated and fertilized in vitro and in vivo. The sperm count and motility, in vivo and in vitro fertilization rate as indicated by two-cell embryos and blastocyst rate were examined. The sperm count and motility from all three knockout mice were not significantly different from that of the wild type. Inducible NOS (iNOS) knockout mice were found to have the largest number of two-cell embryos/mouse collected after fertilization in vivo (P<0.01), but the rate of blastocyst formation from two-cell embryos in vitro was similar for all three knockouts. The rate of in vitro fertilization using either iNOS-deficient sperm or oocytes, but not those deficient in the other two NOS isoforms, was significantly elevated when compared to thatin the wild type (P<0.001). While all three types of NOS do not seem to play a significant role in pre-ejaculated sperm function, iNOS may play an inhibitory role in sperm and oocyte functions affecting the process of fertilization and early embryo development.
机译:一氧化氮(NO)是由1-精氨酸通过一氧化氮合酶(NOS)的三种同工型产生的,与生殖功能有关。但是,NOS亚型在配子功能和受精中的具体作用尚不清楚。三种类型的NOS基因敲除小鼠在体内和体外超排卵并受精。检查了精子数量和活力,体内和体外受精率(如两细胞胚胎所示)和胚泡率。所有三只基因敲除小鼠的精子数量和活力与野生型没有明显差异。发现诱导型NOS(iNOS)敲除小鼠体内受精后收集到的两细胞胚胎/小鼠的数量最多(P <0.01),但是体外三细胞中由两细胞胚胎形成胚泡的速率相似淘汰赛。与野生型相比,使用iNOS缺陷的精子或卵母细胞而不是其他两种NOS亚型缺陷的卵母细胞的体外受精率显着提高(P <0.001)。尽管所有这三种类型的NOS似乎在射精前的精子功能中均不发挥重要作用,但iNOS可能在精子和卵母细胞功能中发挥抑制作用,从而影响受精和早期胚胎发育。

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