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• W4206773992 abstract "Abstract Background Fine particulate matter (PM 2.5 ) exposure accelerates atherosclerosis and contains known ovotoxic chemicals. However, effects of exposure to PM 2.5 on the finite ovarian follicle pool have hardly been investigated, nor have interactions between ovarian and cardiovascular effects. We hypothesized that subchronic inhalation exposure to human-relevant concentrations of PM 2.5 results in destruction of ovarian follicles via apoptosis induction, as well as accelerated recruitment of primordial follicles into the growing pool. Further, we hypothesized that destruction of ovarian follicles enhances the adverse cardiovascular effects of PM 2.5 in females. Results Hyperlipidemic apolipoprotein E ( Apoe ) null ovary-intact or ovariectomized female mice and testis-intact male mice were exposed to concentrated ambient PM 2.5 or filtered air for 12 weeks, 5 days/week for 4 h/day using a versatile aerosol concentration enrichment system. Primordial, primary, and secondary ovarian follicle numbers were decreased by 45%, 40%, and 17%, respectively, in PM 2.5 -exposed ovary-intact mice compared to controls ( P < 0.05). The percentage of primary follicles with granulosa cells positive for the mitosis marker Ki67 was increased in the ovaries from PM 2.5 -exposed females versus controls ( P < 0.05), consistent with increased recruitment of primordial follicles into the growing pool. Exposure to PM 2.5 increased the percentages of primary and secondary follicles with DNA damage, assessed by γH2AX immunostaining ( P < 0.05). Exposure to PM 2.5 increased the percentages of apoptotic antral follicles, determined by TUNEL and activated caspase 3 immunostaining ( P < 0.05). Removal of the ovaries and PM 2.5 -exposure exacerbated the atherosclerotic effects of hyperlipidemia in females ( P < 0.05). While there were statistically significant changes in blood pressure and heart rate variability in PM 2.5 -compared to Air-exposed gonad-intact males and females and ovariectomized females, the changes were not consistent between exposure years and assessment methods. Conclusions These results demonstrate that subchronic PM 2.5 exposure depletes the ovarian reserve by increasing recruitment of primordial follicles into the growing pool and increasing apoptosis of growing follicles. Further, PM 2.5 exposure and removal of the ovaries each increase atherosclerosis progression in Apoe-/- females. Premature loss of ovarian function is associated with increased risk of osteoporosis, cardiovascular disease and Alzheimer’s disease in women. Our results thus support possible links between PM 2.5 exposure and other adverse health outcomes in women." @default.
• W4206773992 created "2022-01-26" @default.
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• W4206773992 date "2022-01-07" @default.
• W4206773992 modified "2023-10-16" @default.
• W4206773992 title "Exposure to environmentally relevant concentrations of ambient fine particulate matter (PM2.5) depletes the ovarian follicle reserve and causes sex-dependent cardiovascular changes in apolipoprotein E null mice" @default.
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