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首页> 外文期刊>Reproductive toxicology >Exposure of neonatal female rats to bisphenol A disrupts hypothalamic LHRH pre-mRNA processing and estrogen receptor alpha expression in nuclei controlling estrous cyclicity.
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Exposure of neonatal female rats to bisphenol A disrupts hypothalamic LHRH pre-mRNA processing and estrogen receptor alpha expression in nuclei controlling estrous cyclicity.

机译:新生雌性大鼠暴露于双酚A会破坏下丘脑LHRH前mRNA加工以及控制发情循环的细胞核中雌激素受体α的表达。

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摘要

This study examines the effects of neonatal exposure to the endocrine disruptor bisphenol A (BPA) on the neural network that controls estrous cyclicity. From postnatal day 1 (PND1) to PND7, female pups were injected with vehicle (control) or BPA (BPA.05: 0.05mg/kg-d, BPA20: 20mg/kg-d). At PND100 BPA.05-females showed alterations in estrous cyclicity and BPA20-females were incapable of producing an estradiol-induced LH surge. By real-time PCR we determined that hypothalamic expression of mature LH-releasing hormone (LHRH) mRNA was increased in BPA.05 and decreased in BPA20-females. Furthermore, unprocessed intron A-containing LHRH RNA was decreased in the cytoplasm of hypothalamic cells of both groups. Immunohistochemistry revealed that estrogen receptor alpha protein was up-regulated in anteroventral periventricular and down-regulated in arcuate nucleus of both groups. Our results show that BPA permanently disrupts hypothalamic LHRH pre-mRNA processing and steroid receptors expression in nuclei that control estrous cyclicity in adult rats.
机译:这项研究检查了新生儿接触内分泌干扰物双酚A(BPA)对控制发情循环的神经网络的影响。从出生后第1天(PND1)到PND7,给雌性幼仔注射媒介物(对照)或BPA(BPA.05:0.05mg / kg-d,BPA20:20mg / kg-d)。在PND100时,BPA.05-女性表现出发情周期的改变,而BPA20-女性则无法产生雌二醇引起的LH激增。通过实时PCR,我们确定成熟的LH释放激素(LHRH)mRNA的下丘脑表达在BPA.05中升高,而在BPA20-女性中降低。此外,两组的下丘脑细胞的细胞质中未加工的含内含子A的LHRH RNA减少。免疫组织化学分析显示,两组前房室周围的雌激素受体α蛋白上调,而弓状核中的雌激素受体α蛋白下调。我们的结果表明,双酚A永久破坏下丘脑LHRH前mRNA加工和控制成年大鼠发情循环的核中类固醇受体表达。

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