Mechanisms of phthalate ester toxicity in the female reproductive system.

Mechanisms of phthalate ester toxicity in the female reproductive system.
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女性生殖系统中邻苯二甲酸酯毒性的机制。

DOI:
10.1289/ehp.5658
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发表时间:
2003-02
影响因子:
10.4
通讯作者:
Davis, BJ
Davis, BJ
中科院分区:
环境科学与生态学1区
文献类型:
--
作者:
Lovekamp-Swan, T;Davis, BJ

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邻苯二甲酸盐是一种高产量的合成化学品,由于在塑料和其他普通消费品中的使用,人类普遍接触到邻苯二甲酸盐。最近的流行病学证据表明,妇女对邻苯二甲酸盐有独特的接触情况,这引起了人们对这种接触可能造成的健康危害的关注。我们的实验室研究了邻苯二甲酸盐如何在动物模型中与女性生殖系统相互作用,以深入了解这些化学物质对女性健康的潜在影响。在此,我们回顾了我们的工作和其他人研究这些机制的工作,并提出了邻苯二甲酸二(2-乙基己基)酯(DEHP)卵巢作用的模型。在体内,DEHP (2 g/kg)导致成年循环大鼠血清雌二醇水平降低,发情周期延长,不排卵。在体外,邻苯二甲酸一乙基己酯(MEHP; DEHP的活性代谢物)以剂量依赖的方式降低颗粒细胞芳香化酶RNA信息和蛋白质水平。在邻苯二甲酸酯中,MEHP在抑制芳香化酶和激活过氧化物酶体增殖物激活受体(PPARs)的能力方面是独一无二的。我们假设MEHP激活ppar抑制颗粒细胞中的芳香化酶。MEHP-、PPAR α -和PPAR γ特异性配体在体外均能类似地降低雌二醇的产生和芳香化酶的RNA信息水平。我们的模型表明,MEHP通过降低促卵泡激素刺激的cAMP和激活ppar,从而导致芳香酶转录减少,从而作用于颗粒细胞。因此,环境污染物DEHP通过其代谢物MEHP通过受体介导的信号通路抑制卵巢中雌二醇的产生,导致无排卵。
Phthalates are high-production-volume synthetic chemicals with ubiquitous human exposures because of their use in plastics and other common consumer products. Recent epidemiologic evidence suggests that women have a unique exposure profile to phthalates, which raises concern about the potential health hazards posed by such exposures. Research in our laboratory examines how phthalates interact with the female reproductive system in animal models to provide insights into the potential health effects of these chemicals in women. Here we review our work and the work of others studying these mechanisms and propose a model for the ovarian action of di-(2-ethylhexyl) phthalate (DEHP). In vivo, DEHP (2 g/kg) causes decreased serum estradiol levels, prolonged estrous cycles, and no ovulations in adult, cycling rats. In vitro, monoethylhexyl phthalate (MEHP; the active metabolite of DEHP) decreases granulosa cell aromatase RNA message and protein levels in a dose-dependent manner. MEHP is unique among the phthalates in its suppression of aromatase and in its ability to activate peroxisome proliferator-activated receptors (PPARs). We hypothesize that MEHP activates the PPARs to suppress aromatase in the granulosa cell. MEHP-, PPAR alpha-, and PPAR gamma-specific ligands all similarly decreased estradiol production and RNA message levels of aromatase in vitro. Our model shows that MEHP acts on the granulosa cell by decreasing cAMP stimulated by follicle stimulating hormone and by activating the PPARs, which leads to decreased aromatase transcription. Thus, the environmental contaminant DEHP, through its metabolite MEHP, acts through a receptor-mediated signaling pathway to suppress estradiol production in the ovary, leading to anovulation.
DOI: 10.1210/jc.81.9.3299
发表时间: 1996-09-01
影响因子: 5.8
作者:
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通讯作者: Whitcomb, R
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发表时间: 2000-10
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DOI: 10.1210/me.13.8.1318
发表时间: 1999-08-01
影响因子: --
作者:
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通讯作者: Richards, JS