Plastic pollution is of global concern. Many studies investigated the effect of micro and nanoplatics towards aquatic organisms. However, relatively few studies were assessed on freshwater organisms. Another aspect of this pollution is the impact of trophic transfer on plastic distribution and on food chain in order to evaluate its potential risk towards environmental and human health. In this context, the objective of this study was to assess the ecotoxicological impacts of different types of nanoplastics (NPs) on freshwater organisms exposed through trophic transfer. Freshwater microalgae Scenedesmus subspicatus were contaminated for 48 h with realistic concentrations of NPs (0.008, 10 and 100 µg/L). Two types of NPs were tested: commercial PS NPs and NPs generated from macro-sized plastics collected in the field (ENV NPs). Freshwater Corbicula fluminea bivalves were then fed with the contaminated algae every 48 h for 21 days. Results showed that trophic exposure led to the induction of oxidative stress (CAT activity). Overall, NPs trophic exposure caused downregulations of genes implicated in many cellular processes (immunity, oxidative stress, neurotoxicity, endocytosis, apoptosis).

中文翻译：

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PS 纳米塑料和田间衍生纳米塑料在淡水蛤 Corbicula fluminea 中的营养转移效应


塑料污染是全球关注的问题。许多研究调查了微塑料和纳米塑料对水生生物的影响。然而，对淡水生物进行评估的研究相对较少。这种污染的另一个方面是营养转移对塑料分销和食物链的影响，以评估其对环境和人类健康的潜在风险。在此背景下，本研究的目的是评估不同类型的纳米塑料 （NPs） 对通过营养转移暴露的淡水生物的生态毒理学影响。淡水微藻 Scenedesmus subspicatus 被实际浓度的 NPs （0.008、10 和 100 μg/L） 污染 48 小时。测试了两种类型的 NP：商业 PS NP 和由现场收集的大尺寸塑料产生的 NP （ENV NPs）。然后每 48 小时用受污染的藻类喂养淡水 Corbicula fluminea 双壳类，持续 21 天。结果表明，营养暴露导致氧化应激 （CAT 活性） 的诱导。总体而言，NPs 营养暴露导致与许多细胞过程 （免疫、氧化应激、神经毒性、内吞作用、细胞凋亡） 相关的基因下调。