Gene expression profiling after exposure to a chemical carcinogen, Pentabrominated Diphenyl Ether, at different life stages.

Gene expression profiling after exposure to a chemical carcinogen, Pentabrominated Diphenyl Ether, at different life stages.
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DOI:
10.3389/ftox.2022.1028309
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发表时间:
2022
影响因子:
--
通讯作者:
Dunnick, June K.
Dunnick, June K.
中科院分区:
其他
文献类型:
--
作者:
Shockley, Keith R.;Dunnick, June K.

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暴露于环境危害发生在我们一生的不同阶段-婴儿,儿童,成人。本研究整合了最近发表的毒理基因组学数据,以研究暴露于已知的大鼠化学致癌物(五溴二苯醚(PBDE))如何在不同的生命周期阶段(PND 4,PND 22,成人)上调肝脏转录组的变化。我们发现,在生命周期的所有三个阶段,多溴联苯醚暴露诱导肝细胞转录组的变化,包括癌症,代谢,膜功能和Nrf 2抗氧化途径,途径的化学致癌物的所有特征的疾病途径。此外,成年大鼠在接触化学致癌物5天后,Ras致癌途径的成员出现上调,这是在先前的一项危险识别癌症研究中发现的在多溴二苯醚诱发的大鼠肿瘤中被激活的一种特定途径。在早期生活暴露和短期成人暴露后,肝脏转录物变化特征的致癌活性的研究结果提供了数据,支持使用转录组学数据预测模型研究中的根尖癌终点。使用新生儿、年轻人或成年人短期化学品暴露后的基因表达谱研究数据有助于满足21世纪的毒理学目标,即开发研究设计以减少、改进和取代使用传统的2年啮齿动物癌症研究来提供危害识别信息。本文报道的研究发现,在模型系统中短期接触多溴联苯醚(一种已知的实验化学致癌物)后,新生动物(PND 4)、幼年动物(PND 22)和成年动物中与致癌作用相关的关键转录本均升高。
Exposure to environmental hazards occurs at different stages of our lifetime–infant, child, adult. This study integrates recently published toxicogenomics data to examine how exposure to a known rat chemical carcinogen (pentabrominated diphenyl ether (PBDE)) upregulated liver transcriptomic changes at different life cycle stages (PND 4, PND 22, adult). We found that at all three life cycle stages PBDE exposure induced hepatocellular transcriptomic changes in disease pathways including cancer, metabolic, membrane function, and Nrf2 antioxidant pathways, pathways all characteristics of chemical carcinogens. In addition, in the adult rat after a 5-day exposure to the chemical carcinogen, there was upregulation of members of the Ras oncogenic pathway, a specific pathway found to be activated in the PBDE-induced tumors in rats in a previous hazard identification cancer study. The findings of liver transcript changes characteristic of carcinogenic activity after early life exposures and after short-term adult exposures provides data to support the use of transcriptomic data to predict the apical cancer endpoints in model studies. Using data from gene expression profiling studies after neonatal, young, or adult short-term chemical exposure helps to meet the 21st century toxicology goal of developing study designs to reduce, refine, and replace the use of traditional 2-year rodent cancer studies to provide hazard identification information. The studies reported here find that key transcripts associated with carcinogenesis were elevated in neonate (PND 4), young (PND 22) and adult animals after short-term exposure to PBDE, a known experimental chemical carcinogen in model systems.
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