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Systemic histopathological responses to nanoplastic exposure: A review of cellular toxicity and organ-level pathology in mammalian systems
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This review pulls together animal studies showing that nanoplastics — tiny plastic particles smaller than 1/100th the width of a human hair — can slip past the body's natural barriers and cause real damage to organs like the brain, lungs, gut, liver, kidneys, and reproductive system, triggering inflammation, cell death, and scarring. The concerning part is that these particles seem to affect multiple organs at once, with damage in one organ (like the gut) potentially worsening problems in another (like the liver). While this research is currently based on animal studies rather than humans, it suggests nanoplastics may pose broader health risks than previ
Nanoplastics (NPs), a subfraction of microplastics smaller than 1 μm, are increasingly recognized for their ability to cross biological barriers and induce organ-level toxicity; however, their systemic histopathological effects remain fragmented across individual studies. This review summarizes current in vivo mammalian evidence on NP-induced cellular toxicity and organ-specific histopathological changes based on a structured literature search of PubMed, Scopus, and Web of Science covering studies published between 2000 and 2024. The findings were narratively organized by organ system. Across the nervous, respiratory, gastrointestinal, hepatobiliary/renal, and reproductive systems, NPs consistently induce common pathological signatures, including immune cell infiltration, apoptosis, fibrosis, epithelial barrier disruption, and ultrastructural organelle damage. These lesions indicate conserved mechanisms involving oxidative stress, inflammatory signaling, impaired cellular homeostasis, and organ-organ crosstalk, such as gut-liver and hepato-renal interactions, which may amplify systemic toxicity. Collectively, the evidence demonstrates that nanoplastics act as system-wide toxicants capable of multi-organ histopathological disruption, distinct from larger microplastics or other nanoparticles, underscoring the need for further mechanistic and pathology-driven evaluation.
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Plasticopathology: Multi-Organ Damage and One Health Implications of Micro- and Nanoplastics
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This review synthesizes findings from animal studies conducted between 2019 and 2025 on tissue damage caused by micro- and nanoplastics across multiple organ systems. Researchers found consistent patterns of tissue injury including inflammation, oxidative stress, and cellular degeneration in the gut, liver, kidneys, reproductive organs, and nervous system, with severity often depending on particle size, exposure route, and duration.
Pathogenesis of Micro/Nanoplastics in Mammalian Systems: Gut to Systemic Multi-Organ Dysfunction
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This review paper summarizes existing research on how tiny plastic particles, swallowed through food or water, affect the gut and then other organs like the liver, brain, lungs and hormone system. It looks at how particle size, shape and chemical makeup influence gut damage, and discusses different lab models used to study these effects.
Assessing the Impact of Nanoplastics in Biological Systems: Systematic Review of In Vitro Animal Studies
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This systematic review of lab studies found that nanoplastics can damage cells in the gut, lungs, liver, brain, and reproductive organs of animals. These ultra-small plastic particles appear capable of crossing biological barriers and causing inflammation and oxidative stress, raising concerns about similar effects in humans.
Gut-Mediated Systemic Toxicity of Micro- and Nanoplastics: Nanoscale Biointerface Properties, Microbiota-Metabolite Crosstalk, and Evidence Across Gut-Organ Axes
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This review pulls together existing research to show how tiny plastic particles we accidentally eat can disrupt our gut—damaging its protective lining, throwing off our gut bacteria, and triggering inflammation—and then send harmful ripple effects to the liver, brain, kidneys, lungs, and reproductive organs. In other words, the health risks of microplastics may not stay confined to your digestive system; they could potentially affect your whole body. This is a summary of current science rather than new experiments, and it highlights that smaller, more weathered plastic particles appear to pose greater risks, an important insight given how widespread these particles are in our
Micro- and nanoplastics disrupt the gut–liver–brain axis: mechanisms of multi-organ toxicity in animal models
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This review pulls together animal research showing that tiny plastic particles (micro- and nanoplastics) don't just pass through your body harmlessly—they can damage the gut lining, throw off gut bacteria, and trigger inflammation that spreads to the liver and even the brain. The smallest particles (nanoplastics) seem especially good at slipping past the body's protective barriers, raising concern about their effects on human health. Since this is based on animal studies so far, more research is needed to confirm how directly these findings apply to people, but it strengthens the case that everyday plastic exposure deserves closer attention.
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