University of Helsinki, Ecosystems and Environment Research Programme, Faculty of Biological and Environmental Sciences, Niemenkatu 73, 15140 Lahti, Finland, And Helsinki Institute of Sustainability Science (HELSUS), Fabianinkatu 33, 00014, Helsinki, Finland; Korea Institute of Science and Technology Europe (KIST Europe) Forschungsgesellschaft mbH, Joint Laboratory of Applied Ecotoxicology, Environmental Safety Group, Universität des Saarlandes Campus E7 1, 66123, Saarbrücken, Germany; University of Manitoba, Clayton H. Riddell Faculty of Environment, Earth, and Resources, Wallace Building, 125 Dysart Road, Winnipeg, MB R3T 2N2, Canada.
Technische Universität Berlin, Institute of Ecology, Chair Ecological Impact Research & Ecotoxicology, Ernst-Reuter-Platz 1, 10587, Berlin, Germany; Stockholm University, Department of Ecology, Environment and Plant Sciences, Svante Arrhenius väg 20A, 11418, Stockholm, Sweden.
Chemosphere. 2022 Jun;296:134037. doi: 10.1016/j.chemosphere.2022.134037. Epub 2022 Feb 17.
Microplastics have been detected in several aquatic organisms, especially bivalves such as clams, oysters, and mussels. To understand the ecotoxicological implication of microplastic accumulation in biota, it is crucial to investigate effects at the physiological level to identify knowledge gaps regarding the threat posed to the environment and assist decision-makers to set the necessary priorities. Typically, xenobiotics elicit an overproduction of reactive oxygen species in organisms, resulting in oxidative stress and cellular damage when not combated by the antioxidative system. Therefore, the present study aimed to establish the impacts of microplastic particles and fibres on the freshwater basket clam Corbicula javanicus. We measured the oxidative stress responses following microplastic exposure as the specific activities of the antioxidative enzymes glutathione S-transferase and catalase. When exposed to polyester fibres from the fleece jackets, the enzyme activities increased in the clams, while the enzyme activities decreased with high-density polyethylene microplastic fragments from bottle caps. All the exposures showed that the adverse effects on the antioxidative response system were elicited, indicating the negative ecotoxicological implications of microplastic pollution.
微塑料已在几种水生生物中被检测到，尤其是双壳类生物，如蛤、牡蛎和贻贝。为了了解生物体内微塑料积累的生态毒理学意义，必须研究生理水平上的影响，以确定有关环境威胁的知识空白，并帮助决策者确定必要的优先事项。通常，外源性物质会在生物体内引发活性氧的过度产生，如果抗氧化系统不能对抗，就会导致氧化应激和细胞损伤。因此，本研究旨在确定微塑料颗粒和纤维对淡水篮蛤（Corbicula javanicus）的影响。我们测量了微塑料暴露后抗氧化酶谷胱甘肽 S-转移酶和过氧化氢酶的比活力，以评估氧化应激反应。当暴露在羊毛夹克的聚酯纤维中时，蛤体内的酶活性增加，而当暴露在瓶盖的高密度聚乙烯微塑料碎片中时，酶活性降低。所有的暴露都表明，抗氧化反应系统受到了不良影响，这表明微塑料污染具有负面的生态毒理学意义。
