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Developmental reproductive impacts of gestational polystyrene nanoplastics exposure: precocious puberty and impaired ovarian reserve in female offspring
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In a mouse study, researchers found that pregnant mice exposed to nanoplastics (tiny plastic particles similar to those found in food and water) gave birth to female offspring with disrupted ovarian development, early puberty, and fewer egg-containing follicles—key markers of long-term fertility. While this research was done in mice, not humans, it raises real concerns about whether nanoplastic exposure during pregnancy could affect a daughter's future reproductive health, highlighting why scientists are calling for more research into how plastics in our environment might impact fertility across generations.
Dietary ingestion of nanoplastics through contaminated food and drinking water has become a pressing human health concern. Despite this pressing health concern, the developmental reproductive impacts of gestational nanoplastics exposure on female offspring remains poorly characterized. Using ICR mouse models subjected to prenatal exposure to 60-nm polystyrene nanoplastics (PS-NPs: 5, 50, or 500 mg/kg/day), this study demonstrated that maternal perinatal PS-NPs exposure significantly disrupted ovarian development, induced precocious puberty, and caused ovarian follicular depletion in female offspring, evidenced by reduced ovarian coefficients, advanced vaginal opening, depleted primordial follicles, and elevated atretic follicles. Mechanistically, ovarian development dysregulations arise from suppressed FOXL2-CYP19A1 signaling and downregulated RSPO1/WNT4/β-catenin pathways, while precocious puberty is driven by earlier elevation of serum GnRH levels and hypothalamic reprogramming. Quantitative proteomics reveals dose-dependent pathway alterations: low-dose PS-NPs dysregulate immune/estrogen responses, whereas high-dose exposure causes steroidogenic disruption and apoptotic dysregulation. Serum hormone profiling showed markedly reduced AMH/E2 and elevated LH, corroborated by transcriptional downregulation of key receptors (amh, ERα, and AR). These findings highlight a potential risk to fetal ovarian development posed by maternal nanoplastics exposure, urging the incorporation of developmental and reproductive toxicity into the comprehensive risk assessment of human exposure to micro/nano-plastics.
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Effects of polystyrene nanoplastics on the female reproductive system in mice: Implications for ovarian function and follicular development
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Researchers exposed female mice to polystyrene nanoplastics orally for 29 days and examined the effects on their reproductive systems. They found that nanoplastic exposure disrupted estrous cycles, impaired follicle development, and altered hormone levels in a dose-dependent manner. The study suggests that nanoplastics, due to their extremely small size, may cross biological barriers and accumulate in reproductive tissues, raising concerns about potential effects on fertility.
Maternal exposure to polystyrene nanoplastics during gestation and lactation caused fertility decline in female mouse offspring
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When pregnant mice were exposed to nanoplastics during pregnancy and nursing, their female offspring had significantly reduced fertility as adults. The nanoplastics caused premature activation of egg cells in the ovaries and damaged crucial connections between eggs and their supporting cells. This raises concerns that a mother's exposure to nanoplastics could have lasting effects on her daughters' ability to have children.
Maternal exposure to polystyrene nanoplastics leads to ovotoxicity in female mouse offspring
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Researchers exposed pregnant mice to polystyrene nanoplastics throughout mating, pregnancy, and nursing, then examined the ovaries of their female offspring. They found that maternal nanoplastic exposure significantly reduced ovarian weight and follicle numbers in the offspring and lowered the expression of key antioxidant genes. The study suggests that nanoplastic exposure during pregnancy may pose risks to the reproductive development of female offspring.
Exposure to Polystyrene Nanoplastics Compromise Ovarian Reserve Function and Endometrial Decidualization in Early Pregnant Mice
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Female mice exposed to polystyrene nanoplastics for 90 days before pregnancy had fewer successful pregnancies, smaller pups, and damaged ovaries with reduced egg counts. The nanoplastics disrupted key reproductive hormones and interfered with the uterine process needed for embryo implantation. This study raises concerns that nanoplastic exposure through food and water could harm female fertility and pregnancy outcomes in humans.
Lactational exposure to polystyrene nanoplastics is associated with dose-related ovarian alterations in rat offspring
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In a rat study, baby females exposed to nanoplastics through their mother's milk showed smaller ovaries, fewer developing egg follicles, hormone imbalances, and more cell damage as they grew up—and the effects got worse with higher doses. This suggests that the period of breastfeeding may be a particularly vulnerable time for nanoplastic exposure to affect reproductive development, raising concerns about how these tiny plastic particles—already found in breast milk—might impact fertility later in life. More research is needed to confirm whether these effects occur in humans.
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