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Type-dependent effects of nanoplastics on microglial activation and CXCR2-mediated chemotactic migration
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Researchers compared how nanoplastics made from three different plastic types affect brain immune cells called microglia. They found that PMMA (acrylic) nanoplastics caused the strongest inflammatory response and increased the migration of immune cells, which could worsen neurological damage. This matters because most microplastic studies only test polystyrene, but real-world plastic pollution includes many plastic types that may have different effects on brain health.
As plastic pollution continues to grow in various ecosystems, potential harmful effects of micro- and nanoplastics have become a great concern. Most studies on the biological effects of nanoplastics have been conducted using polystyrene nano- and microplastics. However, the majority of environmental plastic waste consists of a mixture of various types of plastics, such as polypropylene (PP), polyethylene, polystyrene (PS), polyvinyl chloride and polymethyl methacrylate (PMMA). In this study, we compared the biological effects of nanoplastics derived from three different types of plastics (PS, PP and PMMA) on the functions of microglia, which are the predominant immune cells with macrophage-like functions in the brain. Our experiments with cultured primary rat microglia revealed that the cells exposed to PMMA nanoplastic (PMMANP) exhibited the highest M1 phase activity. In addition, we found that PMMANP increased the migration ability of microglia by inducing the expression of chemokines, such as CXCL1 and CXCL2, in vitro and in vivo. These findings suggest that PMMANP-exposed brain microglia may accelerate neurological disorders by enhancing the recruitment of microglia and peripheral immune cells across the blood-brain barrier under neuropathological conditions.
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Adverse interactions of plastic nanoparticles with cultured primary microglial cells.
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Tiny plastic particles from broken-down polystyrene (a common plastic) can get absorbed into brain immune cells called microglia, causing stress damage and triggering inflammation, according to lab tests on these cells. This matters because microglia act as the brain's cleanup crew and first line of defense, so if microplastics cause them to malfunction, it could contribute to brain inflammation linked to neurological problems—though this study was done in isolated cells, not in living people, so more research is needed to know exactly what this means for human brain health.
Neurotoxic effects of polystyrene nanoplastics on memory and microglial activation: Insights from in vivo and in vitro studies
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In a mouse study, tiny nanoplastics (30-50 nanometers) that were swallowed reached the brain and caused memory problems by activating the brain's immune cells, called microglia, which triggered inflammation. This is concerning because it shows that nanoplastics small enough to be found in everyday products like cosmetics could cross into the brain and impair cognitive function.
Neurotoxic potential of polystyrene nanoplastics in primary cells originating from mouse brain
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Researchers exposed three types of primary mouse brain cells to 100 nm polystyrene nanoplastics and found that neurons underwent apoptosis while astrocytes survived but developed reactive astrocytosis with elevated inflammatory markers, suggesting that neuronal vulnerability to nanoplastic accumulation may be amplified by astrocyte-driven neuroinflammation.
A comparison of the effects of polystyrene and polycaprolactone nanoplastics on macrophages
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A comparison of polystyrene and polycaprolactone nanoplastics on macrophage immune cells found both types induced adverse cellular effects, with the study highlighting that plastic persistence in the environment may drive progressive accumulation leading to chronic immune system impacts.
Exposure to microplastics/ nanoplastics induces responses of microglia and astrocytes: roles of oxidative stress and autophagy
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This study examined how microplastic and nanoplastic exposure affects glial cells in the central nervous system, specifically investigating responses of microglia and astrocytes, which are the brain's primary immune and support cells. Results showed that micro- and nanoplastic exposure triggered inflammatory-type responses in these cells, raising concern for neurological effects.
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When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.