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A systematic review on the effect of microplastics on the hypothalamus-pituitary-ovary axis based on animal studies
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This systematic review of animal studies found that microplastics — especially polystyrene — disrupt the hypothalamic-pituitary-ovarian axis, consistently decreasing estradiol levels and causing ovarian apoptosis and oxidative stress damage. These findings raise concerns about microplastic exposure as a potential contributor to female reproductive health problems in humans.
Humans are exposed to microplastics through three routes: oral, dermal, and respiratory. These tiny polymer particles enter the body and accumulate in various organs. One of the most sensitive organs to microplastics is the female reproductive system. In this review, manuscripts that investigated the effects of various microplastics on the hypothalamic-pituitary-ovarian axis in laboratory animals were collected with relevant keywords. This axis plays an important role in the function of the female reproductive system. Effects on endpoints of this axis, including hormonal changes, gene expression, and histopathological changes, were assessed. The most studied microplastic was polystyrene. Hormone levels were measured in all studies. In almost all studies, 17β-estradiol was decreased. Apoptosis and oxidative stress-induced damage in the ovaries were also observed in some studies. The results summarized from the manuscript emphasize the adverse effects of microplastics, especially polystyrene microplastics, on the female reproductive system following exposure.
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This review describes how microplastics, particularly polystyrene, can reach and accumulate in the female reproductive system through ingestion, inhalation, and skin contact. Animal studies suggest these particles may disrupt ovarian function, hormone balance, and fertility through oxidative stress and inflammation. While human evidence is still emerging, the research raises important questions about microplastic exposure and women's reproductive health.
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