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A Systems Neuroscience Approach Identifies IL1B-CASP3 Signaling as a Molecular Link Between Polystyrene Exposure and Alzheimer’s Disease
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Scientists used computer analysis of gene data to find a possible molecular link between polystyrene (a common plastic) and Alzheimer's disease, identifying specific genes involved in inflammation and cell damage that appear active in both conditions. This doesn't prove plastics cause Alzheimer's, but it offers early clues about how microplastic exposure might contribute to brain inflammation and cell death, the kind of damage seen in the disease, pointing scientists toward specific targets for future research.
Abstract The widespread presence of microplastics and nanoplastics has emerged as a significant environmental concern, with increasing evidence suggesting potential adverse effects on neurological health. However, the molecular mechanisms linking polystyrene exposure to Alzheimer’s disease (AD) remain poorly understood. In this study, an integrative systems biology framework was employed to investigate the molecular interplay between environmental polystyrene exposure and AD pathogenesis. AD-associated genes were retrieved from the Comparative Toxicogenomics Database (CTD) and DisGeNET, while polystyrene-responsive genes were obtained from CTD. Integration of these datasets identified 16 shared genes potentially connecting polystyrene exposure with AD. Transcriptomic analysis of the hippocampal dataset GSE29378 revealed significant differential expression of several overlapping genes between AD and healthy controls. Functional enrichment analyses demonstrated that these genes are predominantly involved in oxidative stress, inflammatory signaling, apoptosis, and synaptic function, all of which are central to AD pathology. Weighted gene co-expression network analysis (WGCNA) further identified disease-associated modules containing multiple intersecting genes strongly correlated with AD clinical traits. Protein–protein interaction analysis highlighted IL1B, CASP3, BCL2, ACHE, and APOE as key hub genes, indicating their potential roles in integrating environmental stress responses with neurodegenerative pathways. Independent validation using the GSE48350 dataset confirmed the robust diagnostic performance of several hub genes in discriminating AD from control samples. Collectively, these findings suggest that environmental polystyrene exposure may promote AD progression through neuroinflammation, oxidative stress, apoptosis, and synaptic dysfunction, providing novel mechanistic insights and identifying promising molecular targets for future experimental, clinical, and epidemiological investigations.
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Cerebral to SystemicRepresentations of Alzheimer’sPathogenesis Stimulated by Polystyrene Nanoplastics
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Researchers exposed both wild-type and APP/PS1 Alzheimer's model mice to environmental levels of polystyrene nanoplastics and measured Alzheimer's-like pathology progression. Nanoplastics exacerbated cognitive decline, microglial activation, and hippocampal neuronal death, particularly in the Alzheimer's model, with systemic inflammatory effects suggesting plastic particles may accelerate neurodegeneration.
Cerebral to Systemic Representations of Alzheimer’s Pathogenesis Stimulated by Polystyrene Nanoplastics
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Researchers found that environmentally realistic levels of polystyrene nanoplastics worsened Alzheimer's disease symptoms in mice, triggering brain inflammation, neuron death, and cognitive decline. The nanoplastics also disrupted metabolism and caused organ damage beyond the brain, including liver and kidney effects. This study provides some of the first evidence that nanoplastic exposure could accelerate brain diseases like Alzheimer's, especially as nanoplastics have been found in human brain tissue.
Alzheimer’s disease: the role of extrinsic factors in its development, an investigation of the environmental enigma
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This review examines how environmental contaminants, including microplastics, may contribute to Alzheimer's disease risk. Along with air pollutants, toxic metals, and pesticides, plastics and microplastics are identified as potential risk factors that may promote brain inflammation and neurodegeneration. The review explores the molecular mechanisms behind these effects and suggests strategies to reduce the brain health impacts of environmental contaminants.
Neurotoxic mechanisms of microplastic compounds in Alzheimer's and Parkinson's diseases: A network toxicology and molecular docking study
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Scientists used computer modeling to study how tiny plastic particles from our environment might affect brain proteins linked to Alzheimer's and Parkinson's diseases. They found that certain microplastic compounds can cross the blood-brain barrier and strongly interact with proteins involved in nerve cell death and brain signaling, suggesting a possible link between plastic pollution exposure and these neurodegenerative diseases. This is early-stage computational research, not a study in living humans, but it points to a concerning connection that deserves more investigation and stronger regulation of microplastics.
Polystyrene Nano- and Microplastic Particles Induce an Inflammatory Gene Expression Profile in Rat Neural Stem Cell-Derived Astrocytes In Vitro
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Researchers exposed brain cells derived from rat neural stem cells to polystyrene nano- and microplastics and found that astrocytes -- the most abundant brain support cells -- were the most affected, showing reduced survival and widespread changes in gene activity. The activated genes were involved in brain inflammation and immune responses, while genes for fat metabolism were turned down. These findings suggest that plastic particles reaching the brain could trigger inflammation that may contribute to neurological problems.
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