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In vitro exposure to polystyrene microplastic induces oxidative stress mediated β-cell dysfunction
Original title: In vitro exposure to polystyrene microplastic induces oxidative stress mediated β-cell dysfunction
Summary
Scientists exposed lab-grown insulin-producing cells to tiny polystyrene microplastic particles (like those found in plastic packaging) and found the plastic got absorbed into the cells, triggered damaging stress, and impaired the cells' ability to function and survive. Since these are the same cells that make insulin in your pancreas, this lab study suggests microplastics could potentially contribute to diabetes risk—though more research is needed to confirm this happens in real human bodies, not just cells in a dish.
Environmental pollution has emerged as a major global health concern, with microplastics (MPs) now recognized as pervasive contaminants in the ecosystem and human tissues. Among them, polystyrene microplastics (PS-MPs) is frequently detected in metabolically relevant organs, raising concerns regarding their roles in diabetes development. In this study, we investigated the cellular and functional effects of PS-MP exposure in pancreatic β-cells using the MIN6 cell line. Our results demonstrated that 1 μm PS-MPs were efficiently internalized and predominantly localized within cytoplasmic and perinuclear regions of the cells. Exposure to PS-MP induced a dose- and time-dependent increase in mitochondrial superoxide and intracellular reactive oxygen species, accompanied by significant suppression of functional β-cell markers. This oxidative stress was associated with pronounced necrotic cell death. Moreover, metabolic viability assays revealed a progressive decline in β-cell viability along with suppression of key β-cell identity markers, including PDX1 and MAFA. Collectively, these alterations contributed to early β-cell dysfunction, a hallmark event in the initiation of diabetes. To our knowledge, this study is among the first to demonstrate an association between PS-MPs exposure, oxidative stress-mediated cytotoxicity, necrosis, and functional impairment in pancreatic β-cells. Our findings highlight a plausible environmental route linking chronic microplastic exposure to β-cell dysfunction, impaired insulin production, and heightened susceptibility to diabetes, underscoring the urgent need to evaluate microplastics as emerging metabolic disruptors.