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Neurotoxic effects of nanoplastics exposure on depression-like behavior and cognitive function in mice under chronic unpredictable mild stress.
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Scientists fed mice tiny plastic particles (nanoplastics) and found they worsened depression-like behavior and memory problems, especially in mice already under chronic stress—mimicking the toll of everyday stress in humans. The nanoplastics appeared to damage brain cells in the hippocampus (the brain's memory center) by disrupting a key protein that helps neurons grow and communicate. While this study was in mice, it raises concerns about how the growing amount of plastic particles in our food, water, and air might affect mental health and brain function in people, particularly those already dealing with chronic stress.
The aim was to investigate the effects of gavage exposure to nanoplastics (NPs) on cognitive decline and depression-like behavior was in-vestigated in mice subjected to chronic unpredictable mild stress (CUMS). BALB/c mice were randomly assigned to four experimental groups: Control (Ctrl), nanoplastics (NPs), Mod (subjected to CUMS), and NPs+Mod (nano-plastics + CUMS). We evaluated the role of the brain-derived neurotrophic fac-tor (BDNF) and its receptor, the tyrosine kinase receptor B (TrkB), signaling pathway in the hippocampus of mice. Behavioral assessments included the su-crose preference test, the open field test, the forced swim test, and the Morris water maze. Nissl staining was used to assess hippocampal neuronal morphol-ogy. BDNF and TrkB mRNA levels and protein expression in the hippocampus were measured by qPCR and Western blotting, respectively. Mice in the NPs, Mod, and NPs+Mod groups showed reduced body weight, lower sucrose pref-erence, poorer performance in the open field test, and prolonged immobility in the forced swim test. Additionally, there was a reduction in hippocampal neurons and deficits in spatial learning and memory compared with the con-trol group. BDNF mRNA and TrkB protein levels were decreased. Compared with the Mod group, the NPs+Mod group exhibited increased depression-like behaviors and cognitive impairments, greater hippocampal neuronal damage, and further reductions in BDNF and TrkB mRNA and protein levels. In conclu-sion, NP exposure has neurotoxic properties that can exacerbate CUMS-induced depression-like behavior and cognitive deficits, likely by further suppressing the hippocampal BDNF/TrkB signaling pathway.
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Micro- and nanoplastic exposure as an emerging risk factor for depressive-like phenotypes across species: a systematic review
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This review of animal and early human studies found that exposure to microplastics and nanoplastics (tiny plastic particles that can travel through the body and reach the brain) is consistently linked to depression-like symptoms, likely by triggering brain inflammation and cell damage. While the human evidence is still preliminary, the pattern across multiple animal studies suggests these ubiquitous plastic particles—found in food, water, and air—could be an overlooked contributor to mental health problems. More rigorous, long-term human research is needed to confirm this link and understand what it means for everyday exposure.
Nanoplastics-induced neurotoxicity: neurovascular dysfunction, cognitive impairment, and mechanisms of cell death.
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This review summarizes existing research on how tiny plastic particles called nanoplastics may affect the brain. Studies in lab models suggest these particles can disrupt the brain's protective barrier, trigger cell stress and death, and interfere with brain cell communication, which researchers link to memory and behavior problems in experimental models.
Polystyrene micro- and nanoparticles exposure induced anxiety-like behaviors, gut microbiota dysbiosis and metabolism disorder in adult mice
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A mouse study found that exposure to both micro- and nano-sized polystyrene particles caused anxiety-like behavior, disrupted gut bacteria, and altered metabolism. The nanoplastics caused more severe effects than the larger microplastics, and longer exposure periods made the damage worse. These findings support the idea that plastic particles can affect brain function and behavior through the gut-brain connection.
Long-term low-dose nanoplastic exposure induces neurotoxicity with oxidative brain damage
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Scientists exposed mice to tiny plastic particles (nanoplastics) at low doses over 17 months—mimicking the kind of gradual exposure humans might get from everyday plastic use—and found it caused brain inflammation, oxidative damage, and activated genetic pathways linked to diseases like Parkinson's. While the mice didn't show major behavior changes, this study suggests that even small, ongoing amounts of plastic exposure over time could quietly harm brain health, reinforcing why reducing plastic exposure in daily life may be worth considering. More research is needed to confirm whether these effects translate to humans
Healthy mice show resilience to chronic nano- and microplastic exposure in the brain
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Healthy young mice were fed micro- and nanoplastics over time, and researchers examined their brains and behavior. Brain scans showed small changes in some cell types, but there was no leakage in the brain's protective barrier, no inflammation, and no changes in movement, anxiety, memory, or fear responses.
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