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Gradual effects of gradient concentrations of polystyrene nanoplastics on metabolic processes of the razor clams
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Researchers exposed razor clams to a gradient of polystyrene nanoplastic concentrations and used metabolomics to track effects, finding that even low concentrations disrupted energy metabolism and amino acid pathways, with effects becoming more severe as concentration increased.
With the widespread occurrence and accumulation of plastic waste in the world, plastic pollution has become a serious threat to ecosystem and ecological security, especially to estuarine and coastal areas. Understanding the impacts of changing nanoplastics concentrations on aquatic organisms living in these areas is essential for revealing the ecological effects caused by plastic pollution. In the present study, we revealed the effects of exposure to gradient concentrations (0.005, 0.05, 0.5 and 50 mg/L) of 75 nm polystyrene nanoplastics (PS-NPs) for 48 h on metabolic processes in muscle tissue of a bivalve, the razor clam Sinonovacula constricta, via metabolomic and transcriptomic analysis. Our results showed that PS-NPs caused dose-dependent adverse effects on energy reserves, membrane lipid metabolism, purine metabolism and lysosomal hydrolases. Exposure to PS-NPs reduced energy reserves, especially lipids. Membrane lipid metabolism was sensitive to PS-NPs with contents of phosphocholines (PC), phosphatidylethanolamines (PE) and phosphatidylserines (PS) increasing and degradation being inhibited in all concentrations. High concentrations of PS-NPs altered the purine metabolism via increasing contents of guanosine triphosphate (GTP) and adenine, which may be needed for DNA repair, and consuming inosine and hypoxanthine. During exposure to low concentrations of PS-NPs, lysosomal hydrolases in S. constricta, especially cathepsins, were inhibited while this influence was improved transitorily in 5 mg/L of PS-NPs. These adverse effects together impacted energy metabolism in S. constricta and disturbed energy homeostasis, which was manifested by the low levels of acetyl-CoA in high concentrations of PS-NPs. Overall, our results revealed the effects of acute exposure to gradient concentrations of PS-NPs on S. constricta, especially its metabolic process, and provide perspectives for understanding the toxicity of dynamic plastic pollution to coastal organisms and ecosystem.
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Researchers exposed clams to nanoplastics at concentrations found in real marine environments and tracked how the particles accumulated in their tissues over 14 days. The nanoplastics caused physical damage and significantly altered the clams' gut bacteria. This is concerning because clams are widely consumed seafood, meaning nanoplastic contamination could affect both marine ecosystems and human food sources.
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Researchers used metabolomics to investigate the neurotoxic potential of polystyrene nanoplastics on the Asian swamp eel at different concentrations. The study found that nanoplastics significantly altered metabolic pathways in the nervous system, with lower concentrations surprisingly producing greater changes in differential metabolites than higher concentrations, suggesting complex dose-response relationships.
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Functionalized polystyrene nanoplastics inhibited growth of marine clams (Meretrix meretrix) at environmentally relevant concentrations by disrupting energy homeostasis and immune function. The study demonstrated that surface functionalization of nanoplastics influences their toxicity to filter-feeding bivalves.
A metabolomics perspective on the effect of environmental micro and nanoplastics on living organisms: A review
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This review examines how scientists use metabolomics, the study of small molecules produced by cellular processes, to understand the toxic effects of microplastics and nanoplastics on living organisms. The research shows that these plastic particles disrupt metabolism in consistent ways across species, affecting energy production, fat processing, and amino acid pathways. These shared metabolic disruptions across different organisms suggest that microplastics could cause similar metabolic problems in humans.
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