Division of Marine BioScience, National Korea Maritime and Ocean University, Busan, 49112, Republic of Korea.
Division of Marine BioScience, National Korea Maritime and Ocean University, Busan, 49112, Republic of Korea.
Comp Biochem Physiol C Toxicol Pharmacol. 2020 Oct;236:108801. doi: 10.1016/j.cbpc.2020.108801. Epub 2020 May 22.
Marine microplastic pollution poses a threat to aquatic organisms, including bivalves. In this study, we investigated the accumulation of microplastics and their elicited antioxidant stress response in the bay scallop Argopecten irradians. Scallops were exposed to 1 μm diameter micro-polystyrene (MP) beads at 10, 100, and 1000 beads/mL concentrations for a 7 day period. Bead presence in the digestive diverticula and defense responses in the digestive diverticula and hemolymph were measured at 1, 3, 5, and 7 days. The activity and expression of the antioxidant enzymes superoxide dismutase (SOD) and catalase (CAT) and HO in the digestive diverticula and/or hemolymph of scallops increased with microplastic concentration and exposure duration. These results suggest that microplastics can accumulate in the digestive diverticula of A. irradians, and that exposure to microplastics induces oxidative stress in bivalves. It is likely that exposure to high concentrations of micro- or nano-sized plastic particles could potentially have adverse effects in bivalves.
海洋微塑料污染对水生生物构成威胁，包括双壳类动物。在这项研究中，我们研究了微塑料在海湾扇贝 Argopecten irradians 中的积累及其引发的抗氧化应激反应。扇贝在 1μm 直径的微聚苯乙烯（MP）珠浓度为 10、100 和 1000 珠/mL 的条件下暴露 7 天。在 1、3、5 和 7 天测量了珠在消化盲囊中的存在以及在消化盲囊和血淋巴中的防御反应。随着微塑料浓度和暴露时间的增加，消化盲囊和/或血淋巴中抗氧化酶超氧化物歧化酶（SOD）和过氧化氢酶（CAT）和 HO 的活性和表达增加。这些结果表明，微塑料可以在海湾扇贝 A. irradians 的消化盲囊中积累，并且暴露于微塑料会诱导双壳类动物的氧化应激。暴露于高浓度的微塑料或纳米塑料颗粒可能会对双壳类动物产生不利影响。
