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Polystyrene nanoplastics impair placental function and promote embryo resorption through ROS-mediated ferroptosis-related injury.
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In a study on pregnant mice and human placental cells, tiny plastic particles called nanoplastics (the kind that break down from everyday plastic waste) crossed the placenta, damaged its cells, and triggered a harmful type of cell death caused by oxidative stress—ultimately leading to more pregnancy loss in the mice. While this research was done in animals and lab-grown cells rather than in humans, it raises real concerns about how the microplastics we're increasingly exposed to might affect pregnancy health, and points to specific biological pathways that future treatments or protective strategies could target.
Polystyrene nanoplastics (PS-NPs) are widespread environmental pollutants that have attracted growing concerns regarding reproductive health. Nevertheless, their effects on spontaneous abortion (SAB) and the underlying mechanisms remain unclear. In this study, we investigated the reproductive toxicity of 50 nm PS-NPs using a pregnant mouse exposure model and HTR-8/SVneo trophoblast cells. In vivo, PS-NPs crossed the placental barrier, disrupted placental structure, altered pregnancy-related hormone levels, and increased embryo resorption. In vitro, PS-NPs reduced trophoblast cell viability and migration, induced cell cycle arrest and apoptosis, and caused mitochondrial dysfunction. Combined transcriptomic and metabolomic analyses further demonstrated that PS-NPs disrupted glutathione and glycerophospholipid metabolism and enriched pathways associated with ferroptosis. Mechanistically, PS-NPs induced reactive oxygen species (ROS) accumulation, glutathione depletion, iron overload, lipid peroxidation, GPX4 downregulation, and ACSL4 upregulation, indicating activation of ferroptosis. Functional rescue experiments in HTR-8/SVneo cells revealed that the ferroptosis inhibitor Ferrostatin-1 partially alleviated PS-NPs-induced ferroptotic injury, whereas the ROS scavenger N-acetylcysteine partially reduced ROS accumulation and improved mitochondrial function. Collectively, our findings suggest that PS-NPs exposure impairs placental function and pregnancy maintenance, with ROS-mediated ferroptosis-related trophoblast injury potentially involved, providing novel insights into the reproductive toxicity of nanoplastics during pregnancy.
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In mice, tiny plastic particles called nanoplastics disrupted the womb's ability to prepare for pregnancy by triggering cell stress that damages cells and blocks their natural cleanup process. This led to fewer successful embryo implantations, suggesting nanoplastic exposure could be a hidden risk factor for early pregnancy problems, though more research is needed to confirm this happens in humans.
Polystyrene Nanoplastics induced placental toxicology by activating Keap1-mediated ferroptosis via METTL3-dependent m6A methylation
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Scientists found that tiny plastic particles called nanoplastics can damage the placenta during pregnancy by triggering a harmful process called ferroptosis, which kills cells through iron buildup. The study used lab cells and pregnant mice to show how these plastic particles disrupt the body's natural protective systems in placental tissue. This research helps explain why microplastics in our environment might pose risks during pregnancy, though more studies are needed to understand the full impact on human health.
Polystyrene nanoparticles induced adverse pregnancy outcomes via the activation of placental ferroptosis and gut microbiota dysfunction
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Researchers exposed pregnant mice to 50-nanometer polystyrene nanoparticles and found that the particles caused adverse pregnancy outcomes through two interconnected mechanisms: disruption of gut microbiota and activation of ferroptosis in placental tissue. The nanoparticle exposure altered the composition of beneficial gut bacteria and triggered iron-dependent cell death in the placenta. The study suggests that maternal exposure to nanoplastics during pregnancy may threaten reproductive health through gut-placenta axis disruption.
Gestational exposure to nanoplastics disrupts fetal development by promoting the placental aging via ferroptosis of syncytiotrophoblast
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This mouse study found that exposure to nanoplastics during pregnancy caused placental aging and fetal growth restriction through a process called ferroptosis -- a type of iron-dependent cell death -- in the cells that form the barrier between mother and baby. When researchers blocked the ferroptosis process, fetal weight improved, suggesting this pathway could be a target for protecting pregnancies from nanoplastic-related harm.
Gestational exposure to micro- and nanoplastics leads to poor pregnancy outcomes by impairing placental trophoblast syncytialization
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Researchers found that exposing pregnant mice to micro- and nanoplastics led to increased embryo loss, reduced embryonic weight, and smaller placentas. The plastic particles impaired a critical process called syncytialization, where placental cells fuse together to form a functional barrier, by activating a stress-response signaling pathway. The study suggests that prenatal microplastic exposure could disrupt placental development and contribute to poor pregnancy outcomes.
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