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Polymer-specific stress responses in planarians exposed to microplastics of similar size
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Researchers exposed freshwater flatworms to three different types of microplastics of similar size through their diet and measured biochemical stress responses. They found that polyurethane particles triggered the most pronounced changes, including increased antioxidant enzyme activity and energy metabolism, while the other polymer types caused milder effects. The study demonstrates that the chemical composition of microplastics, not just their size, determines how organisms respond to them.
Due to their potential ecological impacts, environmental contamination by microplastics (MPs) has gained significant attention. This study investigated the adverse effects of dietary exposure to three distinct polymer types of MPs with similar size-aliphatic polyurethane (PU), polyethylene-polytetrafluoroethylene composite (PE-PTFE), and high-density polyethylene-polytetrafluoroethylene-alumina nanocomposite (HDPE-PTFE-alumina) on the freshwater planarian Girardia tigrina. Dietary exposure was simulated to assess the effects of MPs on the organisms' defense systems and locomotor behavior. The biomarkers assessed were related to oxidative stress, detoxification, antioxidant capacity, cellular energy allocation, planarian locomotor velocity, physiology, and cholinesterase activity. The exposure to PU MPs induced the most pronounced biochemical alterations, with increased glutathione S-transferase, catalase, cholinesterase activities, energy reserves, and aerobic metabolism. Exposure to HDPE-PTFE-alumina MPs also increased glutathione S-transferase activity and aerobic metabolism while reducing lipid peroxidation. In contrast, exposure to PE-PTFE MPs solely reduced lipid peroxidation. Despite these biochemical shifts, planarian movement and physiology were not significantly affected. This study highlights the need for comprehensive analysis of diverse polymers, physiological endpoints, and exposure routes to understand the ecotoxicological impacts of MPs on model species. Additionally, it underscores that comparing effects across polymer types, even within the same species and size range, can lead to confounding results. The results offer valuable insights for future research on long-term sublethal effects, particularly regarding growth, reproduction, behavior, and redox biology in freshwater planarians.
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Researchers exposed the freshwater mussel Dreissena bugensis to multiple types of environmentally realistic microplastics and found that different polymer types caused different biological effects, suggesting that polymer chemistry and associated additives — not just particle size and shape — determine how harmful microplastics are to filter-feeding organisms. This challenges the use of polystyrene spheres as a universal model for microplastic toxicity testing.
In-depth characterization revealed polymer type and chemical content specific effects of microplastic on Dreissena bugensis
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Researchers exposed the freshwater mussel Dreissena bugensis to well-characterized microplastics of different polymer types and chemical compositions, finding that toxic effects varied by polymer type and additive content rather than particle size alone, highlighting the importance of chemical characterization in microplastic ecotoxicology studies.
Size over substance: Microplastic particle size drives gene expression and fitness loss in a freshwater insect
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Researchers exposed freshwater midge larvae to polyamide and polyvinyl chloride microplastics of different sizes and found that particle size mattered more than plastic type in determining harm. Smaller microplastics triggered stronger stress responses at the gene level, including oxidative stress and immune activation, and caused greater reductions in reproduction and survival. The findings suggest that size should be a primary consideration when assessing microplastic risks to aquatic life.
Effects of Microplastics on Selected Earthworm Species
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Researchers tested the effects of five types of microplastics on five earthworm species over one- and three-month exposure periods, measuring survival, respiration, and detoxification enzyme activity. They found species-specific responses to different polymer types and concentrations, with some earthworms showing significant changes in glutathione s-transferase activity, a marker of chemical stress. The study highlights that microplastic impacts on soil organisms vary considerably depending on both the type of plastic and the species exposed.
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Researchers compared how synthetic microplastics and natural microparticles affect brown shrimp at the cellular level. They found that microplastics caused more pronounced stress responses than natural particles, suggesting that the chemical composition of microplastics, not just their physical properties, drives toxicity in marine organisms.
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