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Microplastics in the Perinatal Period: Emerging Evidence on Maternal Exposure, Placental Transfer, and Fetal Health Outcomes
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This review summarizes emerging evidence that microplastics can cross the placenta and reach developing babies, having been detected in maternal blood, placental tissue, amniotic fluid, cord blood, and breast milk. The tiny plastic particles may damage the placenta, disrupt hormones, alter immune responses, and potentially affect fetal growth and brain development. While more research is needed, the findings raise serious concerns about microplastic exposure during pregnancy and its implications for infant health.
Abstract Microplastic pollution has emerged as a pervasive environmental and biomedical concern, with particles < 5 mm identified in drinking water, air, food, and human tissues. Recent studies have detected microplastics in maternal blood, placental tissue, amniotic fluid, cord blood, and breast milk, raising profound concerns about in utero exposure and its implications for fetal development. The maternal-fetal interface is uniquely vulnerable, yet the health impacts of microplastic translocation across gestational barriers remain poorly understood. This narrative review synthesizes the current scientific literature on microplastic exposure during the perinatal period. We analyze peer-reviewed studies from human cohorts, in vivo animal models, and in vitro placental simulations to examine the extent of maternal exposure, routes of fetal transmission, and biological consequences. Evidence is organized according to toxicological mechanisms, including oxidative stress, inflammation, endocrine disruption, immune modulation, and potential epigenetic effects. Placental permeability, dose thresholds, and particle size-dependent dynamics are explored in depth. The emerging evidence suggests that microplastics may impair placental integrity, modulate immune responses, alter fetal growth trajectories, and potentially affect neurodevelopment. However, findings remain heterogeneous due to methodological variation in particle characterization, exposure measurement, and outcome reporting. Several studies indicate consistent signs of proinflammatory and oxidative stress responses within placental tissues. This review highlights critical research gaps – including standardized exposure metrics, longitudinal cohort data, and human-relevant toxicity thresholds – and proposes a translational framework to guide future studies. Understanding microplastic impacts on early human development is essential for shaping global health policies and maternal-fetal environmental protections.
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Microplastics in the human placenta: mechanisms, risks, and futures: a systematic review
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This review pulls together studies showing that tiny plastic particles can reach the placenta, umbilical cord blood, and even a baby's first stool, and may trigger stress and inflammation in placental cells. It's too early to know exactly how much this harms babies long-term, but scientists say it's a concerning enough pattern to warrant urgent, better-designed research.
Microplastic trafficking in maternal-fetal system: a systematic review and quantitative profiling linking particle characteristics to developmental biology
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