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Dietary polystyrene nanoplastics exposure alters liver lipid metabolism and muscle nutritional quality in carnivorous marine fish large yellow croaker (Larimichthys crocea)
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Researchers fed polystyrene nanoplastics to large yellow croaker fish for 21 days and found that the particles accumulated in liver cells and disrupted lipid metabolism. The nanoplastics caused excessive fat buildup in the liver and altered the fatty acid composition and texture of fish muscle tissue. The study suggests that nanoplastic contamination in seafood could affect both fish health and the nutritional quality of fish consumed by humans.
Nanoplastics (NPs) cause various adverse effects on marine fish. However, effects of dietary NPs exposure on liver lipid metabolism and muscle nutritional quality of carnivorous marine fish are not fully understood. In this study, a 21-day feeding test was conducted to simulate the food chain transfer of polystyrene nanoplastics (PS NPs) and then evaluate effects of different dietary PS NPs levels on the survival, growth performance, liver lipid metabolism, and muscle nutritional quality of large yellow croaker Larimichthys crocea. Results indicated that the survival and growth of large yellow croaker decreased with the increase of PS NPs levels. Moreover, PS NPs induced excessive liver lipid accumulation by down-regulating the expression of lipolysis-related genes and inhibiting the AMPK-PPARα signaling pathway. In vitro, PS NPs could be accumulated in hepatocytes, reduce cell viability, and disrupt lipid metabolism of hepatocytes. Also, we found for the first time that PS NPs altered fatty acid composition and texture of fish muscle by enhancing oxidative stress and disrupting lipid metabolism. Overall, this study indicated that PS NPs induced liver lipid deposition by inhibiting lipolysis, and demonstrated that PS NPs altered the nutritional quality of fish, which might cause potential health effects for human consumers.
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Researchers exposed juvenile large yellow croaker fish to nanoplastics for 14 days followed by a 7-day recovery period and measured signs of oxidative stress in their livers. They found that antioxidant enzyme activity and lipid damage markers increased significantly at higher nanoplastic concentrations, and some effects persisted even after the recovery period. The study suggests that nanoplastic exposure may reduce fish survival rates and could have broader implications for fishery productivity.
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Sub-acute exposure to nanoplastics via two-chain trophic transfer: From brine shrimp Artemia franciscana to small yellow croaker Larimichthys polyactis
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