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Micro and nanoplastic inhalation during gestation disrupts placentation in the Sprague-Dawley rat
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When pregnant rats breathed in air containing tiny plastic particles, their placentas didn't develop normally—blood vessels that should have opened up to feed the growing fetus stayed narrow, and the placenta had less surface area to pass nutrients and oxygen to the baby. This matters because we're all breathing in microplastics daily, and this study suggests that during pregnancy, that exposure could interfere with how the placenta supports a developing baby, though more research is needed to confirm this happens in humans too.
Micro and nanoplastics (MNPs) are a ubiquitous environmental contaminant that humans are exposed through multiple routes. Multiple studies have demonstrated that MNPs deposit in human placental tissues and can translocate across the placental barrier. Maternal blood enters the placenta through uterine spiral arteries. During development of the placenta, trophoblasts enter the arteriolar lumen and invade the endothelial layer. This remodeling reduces vascular contractility and maintains maternal blood flow into the placenta. Simultaneously, the placenta increases surface area through angiogenic branching, facilitating the indirect contact of maternal and fetal blood spaces and promoting maternal-fetal exchange. To date, no groups have investigated how maternal MNP exposure affects these key steps of placentation. Therefore, in this study, pregnant Sprague Dawley rats were exposed to air containing polyamide-12 MNP throughout gestation. Placental morphology, invasion of spiral arteries, and angiogenic signaling were evaluated in male and female placentas at GD16 and GD20. Maternal MNP inhalation significantly reduced the relative distance of trophoblast invasion into the placental region that houses maternal spiral arteries. Additionally, MNP exposure increased staining of smooth muscle actin around maternal spiral arteries, indicating poor remodeling and likely reducing uteroplacental blood flow. Likewise, inhalation of MNPs altered the size and number of maternal and fetal blood spaces, favoring less surface area for maternal-fetal exchange. Lastly, significant changes in the expression and spatial distribution of angiogenic and antiangiogenic mRNAs that regulate vascular branching and surface area were observed. Future studies are needed to characterize the mechanisms by which polyamide-12 MNP influences placental hemodynamics.
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Pregnant rats that inhaled micro- and nanoplastic particles throughout gestation passed them to their offspring, with plastic particles detected in pup tissues after birth. This is one of the first studies to show that inhaled microplastics can cross the placental barrier during pregnancy and persist in offspring, raising concerns about prenatal exposure from airborne plastic pollution.
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A single lung exposure to nanoplastics in pregnant rats during late pregnancy reduced fetal and placental weight and caused cardiovascular problems in both the mother and the developing fetus. The nanoplastics disrupted blood flow through the uterine arteries and impaired fetal heart function. This study is concerning because it shows that even a brief inhalation of nanoplastics during pregnancy can have immediate effects on fetal development.
Adverse effects of a realistic concentration of human exposure to microplastics on markers of placental barrier permeability in pregnant rats
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Researchers exposed pregnant rats to polystyrene microplastics at concentrations realistic for human exposure and examined effects on the placenta. They found that the microplastics accumulated in placental tissue, caused oxidative stress, triggered cell death, and reduced the expression of proteins that maintain the placental barrier. The study provides the first evidence that realistic levels of microplastic exposure can compromise the protective barrier between mother and developing offspring.
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.
Micro- and nanoplastic inhalation during pregnancy: Impacts on uteroplacental function and offspring health
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This review examined evidence that inhaled micro- and nanoplastics during pregnancy accumulate in placental and fetal tissues, impair uteroplacental blood flow and immune function, and are associated with adverse developmental outcomes in offspring, identifying inhalation as a critical but understudied exposure route.
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