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成年雄性大鼠对青春期双酚A对激素和行为反应的影响具有恢复力,而与啤酒花提取物共同暴露则支持协同作用。

Adult Male Rats Show Resilience to Adolescent Bisphenol A Effects on Hormonal and Behavioral Responses While Co-Exposure With Hop Extracts Supports Synergistic Actions.

作者信息

Morin Alexandre, Van de Beeck Lise, Person Emmanuelle, Plamondon Helene

机构信息

Behavioural Neuroscience Group, School of Psychology, University of Ottawa, Ottawa, ON, Canada.

出版信息

Front Toxicol. 2021 May 14;3:639820. doi: 10.3389/ftox.2021.639820. eCollection 2021.

Abstract

The adolescence period, marked by sexual and brain maturation, has shown sensitivity to various environmental disruptors. Exposure to the xenoestrogen bisphenol A (BPA) is known to alter physiological and behavioral responses although its role at this critical period remains largely unknown. Recent research further suggests biochemical and genomic effects of BPA to be mitigated by various natural compounds, while effects on behavior have not been examined. This study aimed to characterize (1) the effects of dietary BPA during adolescence on endogenous corticosterone (CORT) secretion, emotional behavior, and testosterone (T) in adulthood, and (2) the impact of combined exposure to BPA with hop extracts (Hop), a phytoestrogen with anxiolytic properties. To do so, four groups of male Wistar rats [postnatal day (PND) 28] were administered corn oil (control), BPA (40 mg/kg), hops (40 mg/kg), or BPA-hops by oral gavage for 21 days (PND 28-48). Blood droplets collected on PND 28, 48, and 71 served to measure CORT and T changes. As adults, rats were tested in the elevated plus maze (EPM), the social interaction test, and the forced swim test. Our findings demonstrated elevated anxiety and a trend toward depressive-like behaviors in BPA- compared to hops-exposed rats. However, BPA intake had no impact on basal CORT levels, or adulthood T secretion and sociability. Of note, BPA's anxiogenic effect manifested through decreased EPM open arm entries was abolished by hops co-supplementation. Together, our observations suggest the adolescence period to be less sensitive to deleterious effects of BPA than what has been reported upon gestational and perinatal exposure.

摘要

以性成熟和大脑成熟为标志的青春期,已显示出对各种环境干扰物敏感。已知接触异雌激素双酚A(BPA)会改变生理和行为反应,尽管其在这一关键时期的作用仍 largely 未知。最近的研究进一步表明,各种天然化合物可减轻BPA的生化和基因组效应,而对行为的影响尚未得到研究。本研究旨在表征:(1)青春期饮食中BPA对成年期内源性皮质酮(CORT)分泌、情绪行为和睾酮(T)的影响;(2)BPA与具有抗焦虑特性的植物雌激素啤酒花提取物(Hop)联合暴露的影响。为此,将四组雄性Wistar大鼠[出生后第(PND)28天]通过口服灌胃给予玉米油(对照)、BPA(40mg/kg)、啤酒花(40mg/kg)或BPA-啤酒花,持续21天(PND 28 - 48)。在PND 28、48和71收集的血滴用于测量CORT和T的变化。成年后,对大鼠进行高架十字迷宫(EPM)、社交互动测试和强迫游泳测试。我们的研究结果表明,与暴露于啤酒花的大鼠相比,暴露于BPA的大鼠焦虑增加且有类似抑郁行为的趋势。然而,BPA摄入对基础CORT水平、成年期T分泌和社交能力没有影响。值得注意的是,通过补充啤酒花消除了BPA通过减少EPM开放臂进入次数所表现出的致焦虑作用。总之,我们的观察结果表明,青春期对BPA有害影响的敏感性低于妊娠期和围产期暴露的报道。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/3e05/8915799/1c1bc809c34f/ftox-03-639820-g0001.jpg

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