Integration of in vivo stress reporters with transcription profiling to define chemical mixtures mechanisms of toxicity, including trans-generational effects

IF 5.4 2区 医学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY
Francisco Inesta-Vaquera , Wenduo Qi , Silviya Dimova-Vasileva , G. Jean Campbell , Febe Ferro , Richard Meehan , Sari Pennings , C. Roland Wolf
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引用次数: 0

Abstract

Humans are exposed to mixtures of chemical pollutants from various environmental sources at all stages of life. Understanding how these compounds are causally linked to population health effects is challenging because of the ethical limitations on studying controlled human exposures and the complexity of the many potential molecular mechanisms involved. We hypothesized that studies using a combination of in vivo murine stress reporter models together with non-targeted global transcriptome analysis will define the toxic mechanisms of complex chemical mixtures in a physiological context. To test this hypothesis, a panel of stress reporter mice were subjected to a mixture of polychlorinated biphenyls (PCBs), persistent environmental pollutants typified by Aroclor 1254 (A1254). In time-dependent and trans-lactational exposure studies we observed activation of stress responses in liver using reporters for Cyp1a1 (aryl hydrocarbons receptor, AHR pathway) and Hmox1 (oxidative stress and inflammation). Whole liver transcriptional analysis revealed distinct Aroclor 1254-linked signatures including xenobiotic metabolism (AHR, CAR/PXR), oxidative stress (Nrf2), cell proliferation, and carcinogenesis. A combination of genetic and biochemical approaches revealed that NRF2 does not mediate Hmox1 activation following A1254 exposure but plays a major role in regulating the expression of genes involved in mitosis. We further demonstrate the utility of our reporter approach to detect the activation of stress responses in mouse neonates exposed to A1254 by lactational transfer. Intriguingly, we observed robust Hmox1 reporter activation in neonate livers for up to two generations following initial maternal exposure. Thus, we exemplify how a combination of in vivo reporter and transcriptional analysis captures novel mechanistic insights into the effects of chemical mixtures of persistent organic pollutants in a relevant physiological context and with cellular resolution, after both primary exposure and in a transgenerational manner. This approach may be applied to understand the full spectrum of mechanisms of toxicity of other chemical mixtures of concern in the physiological context.
整合体内应激报告与转录谱来定义化学混合物的毒性机制,包括跨代效应。
人类在生命的各个阶段都暴露于各种环境来源的化学污染物混合物中。了解这些化合物如何与人群健康影响产生因果关系是具有挑战性的,因为研究受控的人类暴露存在伦理限制,而且所涉及的许多潜在分子机制非常复杂。我们假设,结合体内小鼠应激报告模型和非靶向全局转录组分析的研究将在生理背景下确定复杂化学混合物的毒性机制。为了验证这一假设,一组应激报告小鼠被置于多氯联苯(pcb)混合物中,多氯联苯是一种持久性环境污染物,以Aroclor 1254 (A1254)为典型。在时间依赖性和跨乳期暴露研究中,我们使用Cyp1a1(芳香烃受体,AHR通路)和Hmox1(氧化应激和炎症)报告基因观察肝脏应激反应的激活。全肝转录分析揭示了Aroclor 1254不同的相关特征,包括异种代谢(AHR, CAR/PXR),氧化应激(Nrf2),细胞增殖和致癌作用。遗传和生化方法的结合表明,NRF2在A1254暴露后不介导Hmox1的激活,但在调节有丝分裂相关基因的表达中起主要作用。我们进一步证明了我们的报告者方法在通过哺乳转移暴露于A1254的小鼠新生儿中检测应激反应激活的实用性。有趣的是,我们观察到新生儿肝脏中Hmox1报告基因的激活在母体初始暴露后长达两代。因此,我们举例说明了体内报告和转录分析的结合如何在相关的生理背景下和细胞分辨率下,在初次暴露和跨代方式下,捕获持久性有机污染物化学混合物的影响的新机制见解。这种方法可以应用于了解其他化学混合物在生理方面的毒性机制的全部范围。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
7.70
自引率
3.90%
发文量
410
审稿时长
36 days
期刊介绍: Chemico-Biological Interactions publishes research reports and review articles that examine the molecular, cellular, and/or biochemical basis of toxicologically relevant outcomes. Special emphasis is placed on toxicological mechanisms associated with interactions between chemicals and biological systems. Outcomes may include all traditional endpoints caused by synthetic or naturally occurring chemicals, both in vivo and in vitro. Endpoints of interest include, but are not limited to carcinogenesis, mutagenesis, respiratory toxicology, neurotoxicology, reproductive and developmental toxicology, and immunotoxicology.
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