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Association between long-term exposure of polystyrene microplastics and exacerbation of seizure symptoms: Evidence from multiple approaches
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This study found that long-term exposure to polystyrene microplastics may worsen seizure symptoms by disrupting gut bacteria and triggering inflammation that damages brain cells. Using both human data and animal experiments, the researchers showed that microplastics can set off a chain reaction from the gut to the brain, leading to a type of cell death called ferroptosis in the hippocampus. The findings suggest that chronic microplastic exposure could be a hidden risk factor for people with seizure disorders.
Microplastics are tiny plastic particles originating from both commercial product manufacturing and the degradation of larger plastic materials. These particles pose significant risks to environmental and animal health. A growing body of evidence highlights plastic packaging as a major source of microplastic exposure in children, who are particularly vulnerable to these contaminants compared to adults. Despite growing concern, research on the effects of microplastics on human health remains limited, particularly regarding the potential consequences of long-term microplastic exposure. The aim of this study was to investigate the possible association between the neurotoxic effects of prolonged polystyrene microplastic exposure and seizure symptoms, with a special emphasis on the interplay between inflammation and ferroptosis. We hypothesize that long-term ingestion of polystyrene microplastics may disrupt the gut microbiota and induce systemic inflammation, which could subsequently trigger ferroptosis in hippocampal neurons and exacerbate seizure symptoms. Our research contributes significantly to the existing body of knowledge in three key areas. Our investigation makes significant contributions in three key areas: Firstly, by integrating observational pilot cohort studies and interpretable machine learning techniques, we demonstrate that long-term environmental microplastic exposure exposure may affect the independent inflammation-related risk factors of seizures and thereby exacerbate seizure symptoms. Second, through human network toxicology and therapeutic molecular analyses, our results suggest that melatonin may serve as a potential therapeutic intervention, uncovering mechanistic links between inflammation and ferroptosis involved in microplastic-induced seizure exacerbation. Finally, utilizing mice behavioral assays, our results validate how microplastic exposure disrupts iron and lipid metabolism in the brain, triggering neuronal ferroptosis in the hippocampus. Our study not only deepens our understanding of the neurological impacts of microplastic exposure but also identifies viable pathways for therapeutic interventions.
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Long-term exposure to polystyrene microplastics reduces macrophages and affects the microbiota–gut–brain axis in mice
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Mice that consumed polystyrene microplastics over an extended period showed reduced immune cells called macrophages in their colons and changes in gut bacteria that were linked to altered brain chemistry. This study provides evidence for a gut-brain connection where microplastics may affect brain function indirectly by first disrupting gut health and the immune system.
Polystyrene Microplastics Disrupt the Gut-Brain Axis via Activating Brain TLR4 and Impair Hippocampal Synapses through the TLR4/MyD88/NF-κB Pathway
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Scientists found that tiny plastic particles from polystyrene (commonly used in food containers and packaging) can damage the connection between your gut and brain when consumed. These microplastics disrupt healthy gut bacteria, allowing harmful substances to enter the bloodstream and eventually reach the brain, where they cause inflammation and damage to areas important for memory and learning. This research suggests that exposure to these tiny plastic particles could potentially contribute to brain health problems over time.
Microbiota-mediated metabolic perturbations in the gut and brain of mice after microplastic exposure
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In a mouse study, oral exposure to polystyrene microplastics of two sizes altered the gut bacteria community and caused metabolic changes in both the intestines and the brain. The disrupted gut bacteria appeared to drive changes in bile acid, energy, and other metabolic pathways. These findings support the idea that microplastics in food and water could affect brain health indirectly by first disrupting the gut microbiome and its chemical signals.
Polystyrene Microplastics Exacerbate Systemic Inflammation in High-Fat Diet-Induced Obesity
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Researchers found that polystyrene microplastics significantly worsened inflammation and metabolic problems in obese mice fed a high-fat diet. The microplastics were found throughout the body including the brain, where they activated immune cells in the hypothalamus, a region that controls appetite and metabolism. This study suggests that microplastic exposure could be an overlooked factor contributing to the worsening of obesity-related health problems like insulin resistance and chronic inflammation.
Exposure to polystyrene microplastics impairs hippocampus-dependent learning and memory in mice
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Researchers found that mice exposed to polystyrene microplastics for eight weeks showed impaired learning and memory, with plastic particles detected in their hippocampus, the brain region critical for memory formation. The microplastics caused neuroinflammation, disrupted synaptic signaling, and altered gene expression in the brain. Interestingly, cutting the vagus nerve partially prevented these effects, suggesting that gut-brain communication plays a role in how ingested microplastics affect cognitive function.
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