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Inhalation of Environmentally Simulated PET Nanoplastics Induces Demyelinating Disorders via the CXCL12/CXCR4 Axis
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Mice that breathed in nanoplastic particles from PET plastic showed brain inflammation, damage to the protective coating around nerve cells, and memory and thinking problems. Lab tests found the particles triggered a chain reaction involving brain cells called astrocytes and microglia, and blocking one signal in this chain reduced the nerve damage in cell tests.
Abstract The health threat from airborne nanoplastics (NPs) remains unclear, as despite inhalation being a more direct brain entry route than ingestion, current understanding relies on oral exposure and commercial particle models that obscure realistic risks. Here, by integrating environmentally simulated polyethylene terephthalate (PET)-NPs with an aerosol inhalation model that mirrors real-world human exposure (0.1, 1, and 10 mg/m3), we demonstrate that chronic NP inhalation translocated to the brain and induced demyelination, neuroinflammation, and cognitive deficits. The most pronounced effects were observed at the highest exposure dose (10 mg/m3), which is relevant to the occupational settings. Mechanistically, NP exposure triggered astrocytic CXCL12 release, leading to CXCR4-dependent microglial activation and cytokine network dysregulation. In vitro, blockade of CXCR4 with AMD3100 attenuated NP-induced microglial migration and oligodendrocytic myelin basic protein reduction. Our study thus definitively links realistic airborne NP exposure to the key neuropathological features of demyelinating disorders and pinpoints a modifiable molecular pathway that could inform exposure-based preventive strategies. These findings underscore the need for further assessment of airborne NP risks, particularly in occupational settings.
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Microplastic Particles and Neural Diseases: Mechanistic Links Between Environmental Exposure and Nervous System Dysfunction
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This review pulls together existing research on how tiny plastic particles we breathe or swallow might affect the brain, including triggering inflammation, stressing cells, and weakening the brain's protective barrier. Scientists haven't proven microplastics actually cause brain diseases yet, but these early clues are concerning enough that better human studies are needed.
Deciphering the Neurotoxic Burden of Micro- and Nanoplastics: From Multi-model Experimental Evidence to Therapeutic Innovation
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This review summarizes research on how micro- and nanoplastics damage the brain and nervous system, covering evidence from cell studies, animal experiments, and clinical observations. Plastic particles can cross the blood-brain barrier, disrupt the gut-brain connection, cause oxidative stress, and trigger inflammation that leads to memory problems and cognitive decline. The review also discusses potential treatment strategies, making it a useful resource for understanding the brain health risks of plastic exposure.
Polyethylene terephthalate nanoplastics-induced neurotoxicity in adult male Swiss albino mice with amelioration of betaine: a histopathological, neurochemical, and molecular investigation
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Mice exposed to PET nanoplastics (the type found in food packaging and cosmetics) showed signs of brain damage including increased inflammation, oxidative stress, and reduced levels of a key brain enzyme. The study also found that the supplement betaine significantly protected against this brain damage, suggesting a potential way to counteract nanoplastic-related neurotoxicity.
From exposure to neurotoxicity induced by micro-nanoplastics with brain accumulation and cognitive decline
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This review synthesizes evidence that micro- and nanoplastics can reach the brain by crossing the blood-brain barrier or traveling along nerve pathways, accumulating in regions critical for memory and thinking. Animal studies show that chronic exposure leads to cognitive problems, behavioral changes, and brain changes resembling neurodegenerative diseases, driven by oxidative stress, inflammation, and disruption of the gut-brain connection. The findings raise concern that long-term human exposure to nanoplastics through food and air could contribute to cognitive decline and neurological disease.
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.
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