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Sub-chronic exposure to nanoplastics in vitro disrupts hepatic lipid homeostasis in human hepatocytes
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Scientists exposed liver cells to tiny plastic particles at levels similar to what humans might encounter daily, then watched what happened over a month. Even though the cells looked normal and stayed alive, they quietly built up unhealthy fat deposits and showed signs of inflammation—changes that, if they happen in real livers, could set the stage for fatty liver disease over time. This matters because it suggests that everyday exposure to nanoplastics might harm our health in slow, hidden ways rather than obvious ones, even at levels once thought too low to matter.
Human exposure to micro- and nanoplastics is increasingly recognized as a global concern, yet their long-term effects on human health remain poorly understood. Defining the cellular consequences of chronic exposure is essential for reliable risk assessment and informed environmental and public health strategies. Here, we investigated the impact of prolonged culture in presence of nanoplastics, using an in vitro hepatocyte model (HepG2) exposed to environmentally relevant concentrations (10⁴ and 10⁶ particles/mL). After 28 days, no significant changes in morphology or cell viability were observed. Despite this apparent tolerance, prolonged exposure produced marked metabolic alterations. Cellular lipid content increased in a dose-dependent manner after 120 h, peaked at day 14 (120% ± 16 and 133% ± 12), remained stable until day 21, and declined thereafter. This response was accompanied by altered expression of key lipid metabolism regulators, including SREBP-1C, FABP1, PPAR-α, and PPAR-γ. Lipidomic analysis further revealed a shift in lipid composition from day 14 onward, with increased saturated fatty acids and reduced unsaturated lipids. Although total lipid accumulation partially resolved by day 28, suggesting adaptive responses, the lipidome continued to remodel toward a potentially pathological profile. This metabolic shift was paralleled by an inflammatory signal, as indicated by increased TNF-α expression after 7 days. Together, these findings show that prolonged exposure to low nanoplastic concentrations elicits substantial lipid remodeling, potentially predisposing hepatocytes to lipotoxic and inflammatory states.
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Scientists exposed human liver cells to tiny plastic particles (nanoplastics) at levels that didn't kill the cells, but found the cells' "power plants" (mitochondria) were already struggling—burning less fuel and producing less energy—along with other changes in how the cells process fat and nutrients. This matters because it suggests nanoplastics, which have already been found in real human liver tissue, may quietly stress liver cells and disrupt their metabolism even before any visible damage occurs, raising questions about long-term effects of everyday plastic exposure on liver health.
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Scientists exposed lab-grown mini human livers to nanoplastic levels matching what people actually take in day-to-day, then watched what happened over three weeks. The good news: the plastics didn't kill cells or damage the liver's structure, even though they built up inside it—but they did subtly shift the activity of genes involved in fat processing, bile production, and detoxification, suggesting nanoplastics may quietly nudge liver function even without causing obvious harm. More research is needed to know whether these small genetic changes add up to real health effects over a lifetime of exposure.
Nanoplastic Exposure at Environmental Concentrations Disrupts Hepatic Lipid Metabolism through Oxidative Stress Induction and Endoplasmic Reticulum Homeostasis Perturbation
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A study in fish found that nanoplastics at environmentally realistic concentrations accumulated in the liver and disrupted fat metabolism, causing a condition similar to fatty liver disease. Smaller nanoplastics (100 nanometers) caused more severe damage than larger microplastics by disrupting protein processing in cells and triggering oxidative stress. These findings raise concerns that nanoplastics in the environment could affect liver health in fish and potentially in humans who consume contaminated seafood.
Microplastics, nanoplastics and liver disease: an emerging health concern?
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Researchers reviewed emerging evidence that microplastics and nanoplastics accumulate in human liver tissue at increasing concentrations over the past decade, trigger oxidative stress, fibrogenesis, and inflammation in cell and animal models, and may carry microbial pathogens and endocrine-disrupting chemicals, introducing the concept of plastic-induced liver injury as a new focus for environmental hepatology.
Gel-dispersed micro- and nano- polystyrene (PS), polyethylene terephthalate (PET) and polypropylene (PP) impact metabolic parameters in egg-box liver spheroid model.
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Scientists grew tiny lab-made liver models and exposed them to common plastic particles (from water bottles, packaging, and other everyday plastics) for three weeks to see what happens when liver cells are around microplastics long-term. The plastics didn't kill the liver cells outright, but they did change how the cells produce and use energy, a subtler effect that could add up over time. This matters because it gives researchers a better tool to study how different types of plastic might quietly affect liver health, even without causing obvious damage.
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