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Physiological and Histological Characterization of Chemically Induced Nanoplastic Forced Skin Aging in Mice
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In a mouse study, tiny plastic particles (nanoplastics) combined with an aging-accelerating chemical caused significantly worse skin damage than either factor alone, weakening the skin's protective barrier, drying it out, and triggering inflammation and cell-damaging stress. This suggests that everyday exposure to nanoplastics, which are increasingly found in our environment, could speed up skin aging and harm skin health, especially when combined with other stressors our skin already faces.
Background: NPs and chemical aging, are well documented, but the interactions of these components physiologically on the skin's integrity are not yet well characterized. Objective: To elucidate the effects of polystyrene NP exposure and D-galactose mediated accelerated ageing of the mouse skin. Methodology: Forty male C57BL/6 mice were divided into four groups: Control, NP exposure, Chemical aging, and Combined exposure. The topical treatments were repeated over 4 weeks. Macroscopic observations, transepidermal water loss (TEWL), elasticity, hydration and molecular analysis were performed. Results: Combined exposure showed significant effect on accelerating aging of skin. The combined group had an increase in TEWL values of nearly threefold as compared to the control group, with a value of 15.3±2.1 g/m²/h for the combined group, marking a severe barrier impairment. Skin elasticity dropped to 0.48±0.09 U f and hydration levels to 38.9±7.1. On the molecular level, a significant increase in malondialdehyde (5.1±0.7 mmol/mg) and a dramatic decrease in SOD (55.3±7.5 U/mg) was noted in the combined group. In addition, the pro-inflammatory cytokines, TNF-α and IL-6, were markedly increased to reveal synergic induction of oxidative stress and chronic inflammation by the combination of the two, which was synergistic effects of individual treatments alone. Conclusions: Exposure to nanoplastic significantly increases the chemically induced skin aging through disrupted skin barrier, increased oxidative, and inflammatory responses. The results demonstrate the importance of the risk associated with nanoplastics on skin health.
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This review examines the growing body of evidence linking nanoplastics to aging and age-related conditions. Researchers found that nanoplastics can disrupt key molecular pathways involved in inflammation, oxidative stress, and cellular damage that are central to the aging process. The study suggests that chronic nanoplastic exposure may accelerate biological aging, raising concerns about long-term health effects as environmental plastic pollution continues to increase.
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