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Maternal Polystyrene Nanoplastic Exposure Impairs Cardiac Development in Mouse Offspring and Identifies Lactation as a Sensitive Window in Males
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When pregnant mice were exposed to nanoplastics (tiny plastic particles), their babies developed weaker, damaged hearts — and surprisingly, exposure through breast milk caused even more harm than exposure in the womb. Male offspring also showed disrupted gut bacteria alongside the heart changes, suggesting the two problems may be linked. While this is animal research, it raises real concerns about how microplastic exposure during pregnancy and breastfeeding could affect infant heart development in humans.
Maternal exposure to nanoplastics is a growing concern, but its effects on offspring cardiac development and the relative importance of prenatal and lactational exposure remain unclear. Pregnant C57BL/6J mice were orally exposed to 50 nm polystyrene nanoplastics at 3, 15, or 75 μg/g body weight from gestational day 1 to postnatal day 21. A cross-fostering design was used to distinguish gestational exposure from lactational exposure. Maternal polystyrene nanoplastic exposure caused dose-dependent cardiac dysfunction in offspring, including reduced ejection fraction and fractional shortening, increased myocardial injury markers, cardiomyocyte hypertrophy, and fibrosis. Cross-fostering showed that lactationally exposed offspring exhibited more severe cardiac abnormalities than offspring exposed only during gestation, indicating that the nursing period may represent a more vulnerable window. In male offspring, polystyrene nanoplastic exposure was also associated with gut microbiota dysbiosis and cardiac transcriptomic changes. Enrichment analysis identified downregulation of genes related to AMP-activated protein kinase signalling, and integrated microbiome-transcriptome analysis suggested associations between altered gut taxa and cardiac differentially expressed genes. These findings indicate that maternal polystyrene nanoplastic exposure induces offspring cardiac developmental toxicity, with stronger effects during lactation, and suggest the involvement of gut microbial and cardiac molecular remodelling.
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Maternal exposure to polystyrene nanoplastics induces sex-specific cardiotoxicity in offspring mice
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When pregnant mice were exposed to polystyrene nanoplastics, their offspring developed heart damage that differed between males and females. Female offspring lost more body and heart weight, while males showed signs of atherosclerosis and females showed viral heart inflammation markers. This study suggests that prenatal nanoplastic exposure could program sex-specific cardiovascular problems in children, raising concerns about plastic exposure during pregnancy.
Intestinal Barrier Damage and Growth Retardation Caused by Exposure to Polystyrene Nanoplastics Through Lactation Milk in Developing Mice
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In a study on developing mice, polystyrene nanoplastics transferred from mother to pup through breast milk caused delayed weight gain and significant intestinal damage, including shortened gut lining structures and weakened barriers between intestinal cells. The gut was the primary target of damage even at relatively low doses, while organs like the liver and kidneys showed impaired development without obvious toxic injury. These findings are concerning because they suggest that infants could be exposed to nanoplastics through breast milk, with their developing gut being particularly vulnerable.
Polystyrene nanoplastics disrupt mouse placenta development in a sex-dependent manner.
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Scientists fed pregnant mice tiny plastic particles (similar to what humans are exposed to daily) and found they damaged the structure of the placenta, the organ that nourishes a developing baby, with male fetuses showing more harm than females. While this study was in mice, not humans, it raises real concerns about how the microplastics we're all exposed to through food, water, and air might affect pregnancy and fetal development, and suggests more research is urgently needed.
Polystyrene Nanoplastics Disrupt Mouse Placenta Development in a Sex-Dependent Manner
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Scientists fed pregnant mice tiny plastic particles (like those found in everyday plastic waste) at levels similar to what humans might realistically encounter, and found the plastics changed the structure and hormone-related signaling of the placenta—the organ that nourishes a developing baby. Interestingly, male placentas were more affected than female ones, suggesting nanoplastics may act like hormone disruptors during pregnancy. While this study was done in mice, it raises real concerns about whether the microplastics we're constantly exposed to could affect pregnancy health and fetal development in humans too.
Polystyrene microplastics induce potential toxicity through the gut-mammary axis
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Researchers found that polystyrene microplastics consumed by nursing mice damaged both the gut and mammary glands, disrupting the protective barrier between blood and breast milk. This gut-mammary connection means microplastics could potentially affect not just the person who consumes them but also nursing infants through contaminated breast milk.
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