Conjugation and Deconjugation Reactions within the Fetoplacental Compartment in a Sheep Model: A Key Factor Determining Bisphenol A Fetal Exposure
摘要:
双酚 A(BPA)是一种针对发育过程的内分泌干扰物,人类广泛接触双酚 A,这突出表明有必要更好地了解胎儿接触双酚 A 的机制。动物研究表明,在妊娠晚期,双酚 A 会被胎盘有效结合,主要转化为双酚 A-葡萄糖醛酸内酯(BPA-G),并滞留在胎盘中。反过来,胎儿接触 BPA-G 又可能导致其在胎儿敏感组织水平上解聚成母体双酚 A 后,在原位接触到生物活性双酚 A。我们的研究目的是:1)描述绵羊胎儿肝脏在不同发育阶段的双酚A葡糖醛酸和磺酸结合能力;2)比较人和绵羊肝脏的结合活性;3)评估胎盘和胎儿性腺中双酚A结合和脱结合过程的程度。在妊娠早期,尽管有功能性的磺化结合活性,但绵羊胎儿肝脏对双酚 A 的结合能力很低,这表明这一发育阶段是接触双酚 A 的关键窗口期。相反,晚期绵羊胎儿表现出高效的解毒系统,可将双酚 A 代谢为双酚 A-G。成年绵羊和人类的肝脏葡萄糖醛酸化活性在数量上相似。在胎盘中,双酚 A 结合和双酚 A-G 解结合活性相对平衡,而在性腺中,双酚 A-G 水解活性系统性地高于双酚 A 结合活性。双酚 A-G 可能重新活化为双酚 A,这可能会增加胎儿敏感组织在原位暴露于生物活性双酚 A 的机会。
Conjugation and Deconjugation Reactions within the Fetoplacental Compartment in a Sheep Model: A Key Factor Determining Bisphenol A Fetal Exposure
摘要:
双酚 A(BPA)是一种针对发育过程的内分泌干扰物,人类广泛接触双酚 A,这突出表明有必要更好地了解胎儿接触双酚 A 的机制。动物研究表明,在妊娠晚期,双酚 A 会被胎盘有效结合,主要转化为双酚 A-葡萄糖醛酸内酯(BPA-G),并滞留在胎盘中。反过来,胎儿接触 BPA-G 又可能导致其在胎儿敏感组织水平上解聚成母体双酚 A 后,在原位接触到生物活性双酚 A。我们的研究目的是:1)描述绵羊胎儿肝脏在不同发育阶段的双酚A葡糖醛酸和磺酸结合能力;2)比较人和绵羊肝脏的结合活性;3)评估胎盘和胎儿性腺中双酚A结合和脱结合过程的程度。在妊娠早期,尽管有功能性的磺化结合活性,但绵羊胎儿肝脏对双酚 A 的结合能力很低,这表明这一发育阶段是接触双酚 A 的关键窗口期。相反,晚期绵羊胎儿表现出高效的解毒系统,可将双酚 A 代谢为双酚 A-G。成年绵羊和人类的肝脏葡萄糖醛酸化活性在数量上相似。在胎盘中,双酚 A 结合和双酚 A-G 解结合活性相对平衡,而在性腺中,双酚 A-G 水解活性系统性地高于双酚 A 结合活性。双酚 A-G 可能重新活化为双酚 A,这可能会增加胎儿敏感组织在原位暴露于生物活性双酚 A 的机会。
Uptake, metabolism and excretion of bisphenol A in the rainbow trout (Oncorhynchus mykiss)
作者:Christian Lindholst、Søren N Pedersen、Poul Bjerregaard
DOI:10.1016/s0166-445x(01)00157-6
日期:2001.11
The uptake, metabolism and excretion of the oestrogenic chemical bisphenol A (BPA) were studied in juvenile rainbow trout (Oncorhynchus mykiss). BPA was detectable in plasma, liver and muscle after 2 h of water exposure at 0.44 muM (100 mug BPA/l), and a steady state was reached within 12-24 h. The concentration of the glucuronidated degradation product in the plasma was about twice that of the parent compound. A plasma half life of BPA was calculated as 3.75 h following injection of the compound. The vitellogenin synthesis was measured in response to the BPA treatment, and a lag period of 5 and 7 days between injection of the compound and a significant vitellogenin response was observed for females and males, respectively. At the time of the vitellogenin response no BPA could be detected in the liver tissue from either male or female fish. These results indicate that fish briefly exposed to elevated levels of oestrogenic chemicals might develop a response several days later. (C) 2001 Elsevier Science B.V. All rights reserved.