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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.
Polystyrene (PS) is one of the most widely used microplastics (MPs) globally. However, the neurotoxicity mechanisms triggered by polystyrene microplastics (PS-MPs) have yet to be elucidated. This study explored the damage induced by PS-MPs to the intestinal and central nervous system (CNS) and the potential mechanism. The results showed that PS-MPs exhibited size-dependent bioaccumulation with enhanced barrier penetration at submicron scales (500 nm > 1 μm ≫ 5 μm). Paradoxically, 1 μm PS-MPs demonstrated maximum neuroinflammation despite inferior biodistribution to 500 nm particles. Mechanistically, both sizes induce gut dysbiosis-mediated barrier disruption, elevating circulatory LPS that translocates across compromised BBB. This triggers excessive activation of the TLR4/MyD88/NF-κB pathway, subsequently inducing a surge in pro-inflammatory cytokines, ultimately leading to synaptic lesions in the hippocampal region. Our findings established smaller PS-MPs (≤1 μm) as latent neurodegeneration risk factors, demanding urgent assessment of chronic exposure consequences.
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The gut-brain axis involved in polystyrene nanoplastics-induced neurotoxicity via reprogramming the circadian rhythm-related pathways
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Researchers found that polystyrene nanoplastics given orally to mice crossed the blood-brain barrier and caused neuronal damage in the hippocampus, the brain region responsible for learning and memory. The nanoplastics disrupted the gut-brain connection by altering gut bacteria and circadian rhythm pathways, leading to measurable declines in learning and memory ability. This study provides a biological mechanism showing how ingested plastic nanoparticles could contribute to brain-related health problems in humans.
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.
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.
Microplastic-Induced Disruption of Intestinal Barrier Integrity and Triggering Neuroinflammatory Responses Through Gut-Brain Axis Dysregulation Mediated by NF-κB/PPAR-γ/BDNF Signalling Pathways.
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New research found that when animals were fed common plastic particles (from everyday plastics like grocery bags and food containers) over 45 days, it damaged their gut lining and triggered inflammation that traveled all the way to the brain, along with signs linked to memory problems. This matters because it suggests the tiny plastic bits we're increasingly exposed to through food and water may not just pass through harmlessly — they could disrupt gut health in ways that affect brain function, though more research is needed to confirm this happens in humans.
Nanoplastics activate a TLR4/p38-mediated pro-inflammatory response in human intestinal and mouse microglia cells
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Researchers exposed human intestinal cells and mouse brain immune cells to polystyrene nanoplastics and found that the particles activated inflammatory pathways through a specific receptor called TLR4. The nanoplastics increased production of the inflammatory signal IL-1 beta in gut cells and triggered inflammation-promoting enzymes in brain immune cells. This study provides a mechanism by which nanoplastics swallowed in food or water could trigger inflammation in both the gut and the brain.
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