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Co-exposure to PET and PFOA elicits time-dependent synergistic hepatotoxicity and a "two-hit" mechanism in the freshwater snail Cipangopaludina cathayensis.
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Researchers exposed freshwater snails to PFOA and PET microplastics simultaneously for 28 days, finding that combined exposure caused synergistic liver damage through a novel "two-hit" mechanism — simultaneously suppressing mitochondrial cell death pathways and impairing a key cytoprotective signaling axis, leaving damaged cells unable to be cleared or repaired.
Perfluorooctanoic acid (PFOA) and polyethylene terephthalate (PET) microplastics are prevalent co-contaminants in aquatic systems, yet their combined hepatotoxicity in benthic organisms remains poorly understood. In this 28-day study on the freshwater snail Cipangopaludina cathayensis, we report that co-exposure to PFOA (30 μg/L) and PET (1 mg/L) induces time-dependent synergistic hepatotoxicity. Comprehensive analyses revealed that combined exposure significantly exacerbated hepatopancreatic injury compared to individual treatments, accompanied by disturbances in oxidative stress, neurological function, and energy metabolism systems. Crucially, transcriptomic profiling of hepatopancreatic tissue uncovered a novel "two-hit" mechanism distinct from previous findings: simultaneous suppression of the mitochondrial apoptotic pathway (concurrent downregulation of bcl-2, bax, and Caspases) coupled with impaired function of the NRG-ErbB4-MAPK cytoprotective signaling axis. This unique molecular interplay impedes the clearance of damaged cells and disrupts endogenous repair programs, ultimately leading to irreversible hepatic damage. Our study provides groundbreaking multi-level evidence that microplastic-PFOA co-exposure can synergistically disrupt core cellular defense mechanisms in the hepatopancreas, establishing a crucial mechanistic foundation for ecological risk assessment of complex contaminant mixtures.
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Co-exposure to polystyrene microplastics and perfluorooctanoic acid can exacerbate lipid metabolism disorders and liver damage in adult zebrafish
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Researchers exposed zebrafish to polystyrene microplastics and the persistent pollutant PFOA separately and together for 28 days, finding that combined exposure caused greater intestinal barrier breakdown, liver damage, lipid metabolism disruption, and gut microbiome dysbiosis than either contaminant alone — raising concerns about nonalcoholic fatty liver disease risk from co-occurring plastic and chemical pollution.
Dietary coexposure to micro- and nano-plastics and metabolism-disrupting chemicals: Combined hepatotoxicity — insights from mammalian and cellular models
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Tiny plastic particles from our food can act like tiny taxis for other harmful chemicals, including forever chemicals, BPA, and heavy metals, carrying them deeper into our bodies, and this review of animal and lab-cell studies found that these combos usually cause *more* liver damage together than either would alone. This matters because most safety testing looks at one chemical at a time, so real-world exposure to these mixtures through everyday food may be riskier to liver health than current research accounts for.
“Copper-loaded microplastics unleash endoplasmic reticulum stress-driven liver apoptosis in fish Channa punctatus”
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Researchers found that PVC microplastics loaded with copper caused severe liver damage in fish through a process called endoplasmic reticulum stress, which triggers cell death. The combined exposure to microplastics and copper was more harmful than either pollutant alone. This study demonstrates how microplastics can act as carriers for toxic metals, amplifying their harmful effects on organ health.
Molecular regulatory networks of microplastics and cadmium mediated hepatotoxicity from NAFLD to tumorigenesis via integrated approaches
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This study mapped out how microplastics and the toxic metal cadmium work together to damage the liver, tracing a progression from fatty liver disease to cirrhosis and eventually liver cancer. Cadmium activates genes linked to cell growth and tumor formation, while microplastics trigger cell death pathways related to inflammation. When combined, the two pollutants accelerate liver damage more than either one alone, raising concerns about real-world exposure where people encounter both simultaneously.
Combined exposure to polyvinyl chloride and polystyrene microplastics induces liver injury and perturbs gut microbial and serum metabolic homeostasis in mice
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Mice exposed to a combination of PVC and polystyrene microplastics for 60 days developed liver damage, gut barrier breakdown, and disrupted gut bacteria. The co-exposure also raised cholesterol and triglyceride levels in both blood and liver, and altered hundreds of metabolites related to fat metabolism. Since people are typically exposed to multiple types of microplastics simultaneously, this study suggests the combined effects may be worse than exposure to a single type alone.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.