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Micro‐ and nanoplastics in gastrointestinal disorders: Mapping the translational gap between exposure, biomonitoring, and pathogenic mechanisms
Summary
Tiny plastic particles from our food, air, and water may be doing more than just passing through our bodies, this review of existing research suggests they can irritate the gut lining, trigger inflammation, and throw off the balance of healthy gut bacteria. While scientists haven't yet nailed down exactly how much exposure causes harm or the precise mechanisms involved, the evidence so far suggests these ever-present plastic particles could be a hidden contributor to digestive health problems, making it a research area worth watching.
Abstract Micro‐ and nanoplastics (MNPs) have become pervasive environmental contaminants with increasing evidence linking them to adverse health outcomes. As ingestion constitutes a primary exposure route, the gastrointestinal tract represents a critical biological interface for MNPs‐host interactions and subsequent pathological manifestations. This review systematically synthesizes current knowledge regarding MNPs physicochemical properties, human exposure pathways, and their emerging role in gastrointestinal disorders. The inherent physicochemical heterogeneity of MNPs presents significant challenges for accurate detection and toxicological evaluation. Human populations are predominantly exposed through dietary intake, inhalation, and dermal contact. Standardized fecal detection protocols are critically needed for reliable quantification and cross‐study harmonization. Current evidence indicates MNPs disrupt gastrointestinal homeostasis through multiple mechanisms, including epithelial barrier impairment, immune‐mediated inflammation, oxidative stress‐induced cytotoxicity, and gut microbial dysbiosis. Importantly, this review highlights a critical “translational gap” linking environmental exposure assessment, human biomonitoring evidence, and mechanistic toxicology. By integrating these currently disconnected research domains, this framework aims to facilitate a more coherent understanding of how environmental MNPs exposure may contribute to the pathogenesis of gastrointestinal disorders.