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Effects of Exposure to Micro- and Nanoplastics on Endometrial Injury and Adverse Pregnancy Outcomes: Evidence Integration Using the Targeted Risk Assessment of Environmental Chemicals Framework
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Tiny plastic particles (called micro- and nanoplastics) found in our environment may harm the lining of the uterus, according to a review that combined lab experiments with existing research. Scientists found that these plastic particles can damage uterine cells by increasing cell stress and lowering proteins needed for a fertilized egg to implant successfully, which researchers classified as a "moderate risk" to reproductive health. While more research is needed to confirm how this affects real pregnancies, the findings raise concerns about how everyday plastic exposure might impact fertility and pregnancy outcomes.
Micro- and nanoplastics (MNPs) are emerging environmental pollutants, but evidence concerning their effects on endometrial injury and adverse pregnancy outcomes remains limited. Therefore, we employed the Targeted Risk Assessment of Environmental Chemicals (TRAEC) strategy to integrate evidence concerning endometrial injury and adverse pregnancy outcomes associated with exposure to MNPs. Following targeted screening, 21 unique studies yielded 24 literature-derived evidence entries. Together with one additional in vitro evidence item from the present study, 25 evidence items were included in the final CES calculation. The available evidence was quantitatively integrated across four predefined TRAEC dimensions: Reliability Scores, Weight of Concentrations, Risk Intensity, and Correlation Scores. Under the tested in vitro conditions, exposure to PS-NPs increased intracellular ROS accumulation, reduced mitochondrial membrane potential, promoted apoptosis, and decreased the expression of key endometrial receptivity proteins, namely HOXA10, FOXO1, and ITGB3, in primary human endometrial stromal cells. Based on this combined evidence pool, the final Comprehensive Evidence Score was 7.67, corresponding to a preliminary moderate-risk classification within the predefined TRAEC framework. In summary, the TRAEC strategy provides a structured approach for integrating multi-level evidence and deriving a framework-specific health-risk classification for exposure to MNPs.
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Investigation of potential toxic effects of nano- and microplastics on human endometrial stromal cells
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Researchers exposed human endometrial cells (uterine lining cells) to polystyrene nano- and microplastics and found that smaller particles (100 nanometers) were taken up most readily, accumulating in both the nucleus and cytoplasm. At higher concentrations, the nanoplastics reduced cell growth and triggered cell death. These findings suggest that nanoplastics could pose a risk to uterine health and potentially affect fertility and pregnancy outcomes.
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This review examined potential detrimental effects of nano- and microplastics in human reproductive health, assessing in vitro and animal studies showing disruption to sperm motility, hormonal signaling, and embryonic development. The authors conclude that reproductive toxicity is a plausible concern but emphasize the lack of direct human clinical evidence.
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Tiny plastic bits called microplastics have been found in human testes, semen, ovarian fluid, and placentas, and this review of existing research suggests they may harm fertility by triggering inflammation, cell damage, and hormone disruption. While scientists are still figuring out exactly how much exposure is harmful and which types of plastic pose the biggest risk, the growing evidence is a reason to pay attention to reducing everyday plastic exposure. More research is needed before we know the full picture, but this is an area worth watching closely.
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