The biphasic modulation of inhibin mRNA levels and secretion by PMSG in rat granulosa cells in vitro.

The biphasic modulation of inhibin mRNA levels and secretion by PMSG in rat granulosa cells in vitro.
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体外大鼠颗粒细胞中 PMSG 对抑制素 mRNA 水平和分泌的双相调节。

DOI:
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发表时间:
1991
期刊:
Reproduction, Fertility and Development
影响因子:
--
通讯作者:
J. Findlay
J. Findlay
中科院分区:
--
文献类型:
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作者:
U. Michel;Z. Krozowski;J. McMaster;J. H. Yu;J. Findlay

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使用来自己二烯雌酚处理的未成熟大鼠的颗粒细胞培养物来研究妊娠马血清促性腺激素 (PMSG) 对抑制素 α 和 β A 亚基稳态 mRNA 水平以及免疫反应性抑制素和黄体酮分泌的体外影响。治疗 48 小时后,PMSG 的剂量反应曲线显示,在 1 至 10 mU PMSG mL-1 范围内,胞质 α 和 β A mRNA 的最大刺激(2.5-3.5 倍),并相应刺激抑制素分泌。高剂量的 PMSG (160-500 mU mL-1) 明显抑制抑制素 α mRNA 水平以及抑制素分泌,而孕酮 (P) 受到最大程度的刺激(高达 600 倍)。虽然细胞质抑制素βA亚基mRNA的水平也被培养基中高浓度的PMSG下调,但将其mRNA水平抑制到低于对照所需的剂量有所不同。这些数据表明,低剂量的卵泡刺激素/黄体生成素 (FSH/LH) 样 (PMSG) 活性增强,高剂量降低体外大鼠颗粒细胞中抑制素的稳态 mRNA 水平。这种体外双相调节反映了在大鼠发情周期期间观察到的抑制素分泌的差异调节。
Granulosa cell cultures derived from diethylstilboestrol-treated immature rats were used to study the in vitro effect of pregnant mare serum gonadotrophin (PMSG) on steady state mRNA levels for the inhibin alpha and beta A subunits and the secretion of immunoreactive inhibin and progesterone. After 48 h treatment the dose-response curve of PMSG revealed a maximum stimulation (2.5-3.5 fold) of cytosolic alpha and beta A mRNAs over the range of 1 to 10 mU PMSG mL-1, with corresponding stimulation of inhibin secretion. A high dose of PMSG (160-500 mU mL-1) clearly suppressed inhibin alpha mRNA levels as well as inhibin secretion, whereas progesterone (P) was maximally stimulated (up to 600 fold). Although the level of cytosolic inhibin beta A subunit mRNA was also down-regulated by a high concentration of PMSG in the culture medium, the doses required to suppress its mRNA level to less than those of the control varied. These data demonstrate that low doses of follicle stimulating hormone/luteinizing hormone (FSH/LH)-like (PMSG) activity enhances and high doses decrease the steady-state mRNA levels of inhibin in rat granulosa cells in vitro; this biphasic regulation in vitro reflects the differential regulation of inhibin secretion observed during the rat oestrous cycle.
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