Lipopolysaccharide and heat stress impair the estradiol biosynthesis in granulosa cells via increase of HSP70 and inhibition of smad3 phosphorylation and nuclear translocation

文献类型： 外文期刊

第一作者： Li, Hui

作者： Li, Hui;Cai, Liuping;Shi, Zhendan;Guo, Shuangshuang;Ma, Weiming

作者机构：

关键词： Lipopolysaccharide;Heat stress;Granulosa cell;Estradiol;HSP70;Smad3

期刊名称：CELLULAR SIGNALLING （ 影响因子：4.315； 五年影响因子：4.206 ）

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年卷期：

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收录情况： SCI

摘要： LPS and heat stress have been shown to exert various toxic effects in animals, as they induce estradiol biosynthesis dysfunction in granulosa cells (GCs) and result in low reproductive performance. However, there is limited information regarding their detailed mechanisms. In the present study, primary cultured porcine GCs were treated with LPS (1000 ng/mL for 48 h), or heat stress (41 degrees C for 3 h), in vitro, with or without the HSP70 inhibitor VER155008 (10 mu M), to investigate their potential mechanisms. To mimic the spike in HSP70 from LPS and heat stress, treatments with only the HSP70 activator STA-4783 (10 mu M for 3 h or 48 h) were also performed. We found that LPS and heat stress treatments could significantly reduce the expressions of FSHR and CYP19A1; associated with a reduction in estradiol concentrations; and increased in HSP70 expression both at mRNA and protein levels. While, VER155008 attenuation of LPS and heat stress induced HSP70 upregulation can restore the expressions of FSHR and CYP19A1. Furthermore, STA-4783 treatment alone can mimic the effects of LPS and heat stress treatments. Following immunofluorescence staining and western blot analysis showed that Smad3 phosphorylation and nuclear translocation were also inhibited by LPS, heat stress and STA-4783 treatments. We also examined the interactions between HSP70 and Smad3 by yeast two-hybrid screening, the results revealed that HSP70 indirectly interacted with Smad3. Thus, our results suggested that LPS and heat stress could impair estradiol biosynthesis in GCs via increased HSP70 and indirect inhibition of Smad3 phosphorylation and nuclear translocation. (C) 2016 Elsevier Inc. All rights reserved.

分类号： Q24

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