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Microplastics and Nanoplastics as Potential Contributors to Neurodegenerative Disease: Mechanistic Links to Dementia, Parkinson's Disease, Epilepsy, and Emerging Therapeutic Opportunities
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Researchers reviewed emerging evidence that micro- and nanoplastics may contribute to neurodegeneration by promoting neuroinflammation, oxidative stress, blood-brain barrier disruption, and direct interactions with aggregation-prone proteins like amyloid-β and α-synuclein, proposing that pre-existing neurological disease may increase susceptibility to particulate accumulation in brain tissue.
Microplastics and nanoplastics (MNPs) are increasingly recognized as environmental contaminants with potential neurological relevance. Recent studies reporting particulate material in human brain tissue, including the olfactory bulb, have intensified interest in inhalation and systemic exposure routes to the central nervous system (CNS). Emerging evidence suggests that MNPs may contribute to neurodegenerative pathology through chronic neuroinflammation, oxidative stress, blood-brain barrier (BBB) dysfunction, impaired proteostasis, and direct interactions with aggregation-prone proteins such as amyloid-β, tau, and α-synuclein. These mechanisms may be relevant not only to Alzheimer’s disease and related dementias, but also to Parkinson’s disease and other neurological disorders. This perspective reviews current evidence, proposes a vulnerability framework in which pre-existing neurodegenerative disease may increase susceptibility to particulate accumulation, and outlines therapeutic opportunities including interaction-mediated mitigation, targeted lipid nanoparticle (LNP) delivery, and exposure-responsive biomonitoring.
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Microplastics and Nanoplastics as Potential Contributors to Neurodegenerative Disease: Mechanistic Links to Dementia, Parkinson's Disease, Epilepsy, and Emerging Therapeutic Opportunities
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Researchers review how microplastics and nanoplastics may reach the brain via inhalation and systemic routes, proposing that chronic neuroinflammation, oxidative stress, and direct interactions with proteins like amyloid-β and α-synuclein could link particle exposure to Alzheimer's, Parkinson's, and other neurodegenerative conditions.
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Researchers reviewed the mechanistic links between microplastic and nanoplastic exposure and the two most common neurodegenerative diseases — Alzheimer's and Parkinson's — finding evidence that oxidative stress, neuroinflammation, blood-brain barrier disruption, and protein aggregation are key pathways connecting plastic pollution to neurodegeneration.
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This review explores the emerging connection between microplastic exposure and neurodegenerative diseases such as Alzheimer's and Parkinson's, identifying shared pathophysiological pathways. Researchers found that microplastics can cross the blood-brain barrier and may trigger oxidative stress, neuroinflammation, and protein aggregation, which are hallmarks of these conditions. The study suggests that chronic microplastic exposure could be a contributing environmental factor in neurodegeneration, though direct causal evidence in humans is still lacking.
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Researchers synthesize emerging evidence that nanoplastics can cross the blood-brain barrier, accelerate amyloid aggregation, impair microglial clearance, and drive neuroinflammation via the gut-liver-brain axis — mechanisms tied to Alzheimer's and Parkinson's disease — while mapping the scientific gaps in exposure data and causality that must be closed before definitive conclusions can be drawn.
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