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Daphnia magna Gut‐Specific Transcriptomic Responses to Feeding Inhibiting Chemicals and Food Limitation

机译:Daphnia magna肠道细胞转录组反应抑制化学品和食物限制

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Transcriptomic responses combined with apical adverse ecologically relevant outcomes have proven to be useful to unravel and anchor molecular mechanisms of action to adverse outcomes. This is the case for feeding inhibition responses in the model ecotoxicological species Daphnia magna. The aim of the present study was to assess the transcriptomic responses in guts dissected from D. magna individuals exposed to concentrations of selected compounds that inhibit feeding and compare them with the responses associated to 2 levels of food restriction (low food and starvation). Chemical treatments included cadmium, copper, fluoranthene, lambda-cyhalothrin, and the cyanotoxin anatoxin-a. Although the initial hypothesis was that exposure to chemical feeding inhibitors should elicit similar molecular responses as food limitation, the corresponding gut transcriptomic responses differed significantly. In moderate food limitation conditions, D. magna individuals increased protein and carbohydrate catabolism, likely to be used as energetic sources, whereas under severe starving conditions most metabolism-related pathways appeared down-regulated. Treatment with chemical feeding inhibitors promoted cell turnover-related signaling pathways in the gut, probably to renew tissue damage caused by the reported oxidative stress effects of these compounds, and inhibited the transcription of gut digestive gene enzymes and energetic metabolic pathways. We conclude that chemical feeding inhibitors, rather than mimicking the physiological response to low- or no-food conditions, cause specific toxic effects, preventing Daphnia both from feeding and from adjusting its metabolism to the resulting low energy intake. Environ Toxicol Chem 2021;00:1-11. (c) 2021 SETAC
机译:转录组反应与顶端不良生态相关结果结合,已被证明是有用的,可用于解开和锚定分子作用对不利结果的分子。这是喂养模型生态毒理学物种Daphnia Magna中的抑制反应的情况。本研究的目的是评估从暴露于抑制喂养的所选化合物的D.Magna个体中解剖的肠道的转录组反应,并将它们与2水平的食物限制(低食物和饥饿)相关的反应进行比较。化学处理包括镉,铜,氟,λ-cyhalothrin和氰毒素anatoxin-a。虽然初步假设是暴露于化学饲养抑制剂,但应引起与食物限制相似的分子反应,但相应的肠道转录组反应显着差异。在适度的食物限制条件下,D.Malma个体增加蛋白质和碳水化合物分解代谢,可能被用作能量来源,而在严重的饥饿条件下,大多数新陈代谢相关的途径出现下调。用化学进料抑制剂治疗促进了肠道中的细胞周转相关信号通路,可能恢复由这些化合物的报告的氧化应激效果引起的组织损伤,并抑制了肠道消化基因酶和能量代谢途径的转录。我们得出结论,化学饲养抑制剂,而不是模仿对低或无食物条件的生理反应,导致毒性作用,防止喂食和将其代谢调节到所得低能量摄入量。环境毒素化学2021; 00:1-11。 (c)2021 Setac

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