首页> 外文期刊>Canadian Journal of Physiology and Pharmacology >Retinoic acid suppression of endothelial nitric oxide synthase in porcine oocyte.
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Retinoic acid suppression of endothelial nitric oxide synthase in porcine oocyte.

机译:维甲酸抑制猪卵母细胞内皮型一氧化氮合酶。

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摘要

The presence of endothelial nitric oxide synthase (eNOS) has been found in porcine oocytes, but its mRNA and protein levels remain relatively constant during hormonal stimulation. The present study was designed to determine the effect of retinoic acid on eNOS regulation in porcine oocytes during follicle-stimulating hormone (FSH) stimulation. Cumulus-oocyte complexes (COCs), prepared from small antral follicles of immature porcine ovaries, were cultured for 15 h and treated with FSH for an additional 48 h. eNOS mRNA and its protein were analyzed by reverse transcription - polymerase chain reaction and Western blotting, respectively. Retinoic acid had an inhibitory effect on the level of oocyte eNOS mRNA in a dose-dependent manner if COCs were exposed to retinoic acid before FSH stimulation. The inhibition of FSH action was reflected in a decrease in expression of c-fos mRNA. eNOS protein also decreased to approximately 50% of the control after exposure to 10 microM retinoic acid. However, the ability of NO synthesis was abolished in the oocytes prepared from retinoic acid pretreated COCs. These results suggest that retinoic acid has a strong inhibitory action on eNOS mRNA level and NO synthesis in the porcine oocyte.
机译:猪卵母细胞中发现了内皮型一氧化氮合酶(eNOS),但在激素刺激过程中其mRNA和蛋白质水平保持相对恒定。本研究旨在确定在卵泡刺激素(FSH)刺激过程中维甲酸对猪卵母细胞eNOS调节的影响。由未成熟的卵巢卵巢的小窦卵泡制备的卵-卵母细胞复合物(COC)培养15小时,再用FSH处理48小时。通过反转录-聚合酶链反应和蛋白质印迹分别分析了eNOS mRNA及其蛋白。如果在FSH刺激之前将COC暴露于视黄酸,则视黄酸对卵母细胞eNOS mRNA的水平具有剂量依赖性的抑制作用。 FSH作用的抑制反映在c-fos mRNA表达的减少中。暴露于10 microM视黄酸后,eNOS蛋白也降至对照的约50%。然而,从视黄酸预处理的COCs制备的卵母细胞中,NO合成的能力消失了。这些结果表明,视黄酸对猪卵母细胞中的eNOS mRNA水平和NO合成具有很强的抑制作用。

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