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Tracking of [ 14 C]Polystyrene Nanoplastics in Pregnant Mice (Adv. Sci. 32/2026)
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Scientists used a special tracking method to follow tiny plastic particles (nanoplastics, which come from breakdown of everyday plastic waste) inside pregnant mice, and found that these particles travel through the mother's body and reach the interface between mom and developing fetus. This matters because it suggests plastics we're all exposed to daily could potentially reach a growing baby during pregnancy, though this study was in mice and more research is needed to understand what this means for human pregnancies.
Polystyrene Nanoplastics This cover illustrates the transformation of everyday plastic waste into nanoplastics capable of entering the maternal body during pregnancy. Using [14C]polystyrene as a traceable signal, the study reveals the otherwise invisible biodistribution of nanoplastics in pregnant mice and highlights their presence at the maternal–fetal interface. More details can be found in the Research Article by Olga Khaybullina, Pallavi Sarkhel, and Outi M. Keinänen (DOI: 10.1002/advs.202523995).
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Tracking of [ 14 C]Polystyrene Nanoplastics in Pregnant Mice
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Tracking radiolabeled polystyrene nanoparticles in pregnant mice revealed that exposure route and particle size govern biodistribution, with intranasal exposure largely retaining particles in the lungs while intravenous administration showed size-dependent liver and spleen accumulation. Crucially, transplacental transfer was minimal even after direct IV injection, suggesting the placenta provides meaningful but imperfect restriction of nanoplastic passage to the fetus.
Nanopolystyrene translocation and fetal deposition after acute lung exposure during late-stage pregnancy
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Researchers exposed pregnant mice to nanoscale polystyrene particles through inhalation and tracked where the particles traveled. They found that the nanoplastics crossed from the lungs into the bloodstream and accumulated in both placental and fetal tissues, confirming that inhaled plastic nanoparticles can reach developing offspring during pregnancy.
Nanopolystyrene Translocation and Fetal Deposition After Acute Lung Exposure During Late-Stage Pregnancy
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Nanopolystyrene particles inhaled by pregnant mice during late pregnancy crossed into the bloodstream and deposited in fetal tissues. This finding raises concern that airborne nanoplastics could pose a risk to fetal development, especially given growing human exposure to plastic particles in indoor and outdoor air.
Tracing the In Vivo Fate of Polystyrene Nanoplastics via a Lanthanide Copolymerization Labeling Strategy
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Researchers incorporated lanthanide elements into polystyrene nanoplastics during synthesis to create stably labeled tracers, then used these to show that after oral ingestion in mice only 0.01–0.04% of the dose reaches major organs, while intravenous particles concentrate in liver and spleen with positively charged particles showing greater uptake.
Nanopolystyrene translocation and fetal deposition after acute lung exposure during late-stage pregnancy
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This animal study found that nanopolystyrene particles inhaled by pregnant mice during late pregnancy were transferred across the placenta and deposited in fetal tissues. The findings provide experimental evidence that airborne nanoplastics can reach unborn fetuses, raising serious concerns about developmental exposure from breathing indoor or outdoor air containing plastic particles.
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