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• W3093140412 endingPage "111432" @default.
• W3093140412 startingPage "111432" @default.
• W3093140412 abstract "Humans are exposed to phthalates ubiquitously, which may threaten health. However, whether di-n-octyl phthalate can prevent pubertal sexual maturity is still elusive. In this study, male Sprague Dawley rats (age 35 days) were treated daily by gavage with 0, 10, 100, and 1000 mg/kg body weight of di-n-octyl phthalate from day 35 to day 49 after birth. Di-n-octyl phthalate significantly reduced serum testosterone levels at doses of 100 and 1000 mg/kg, but increased serum luteinizing hormone levels of 1000 mg/kg and decreased testosterone/luteinizing hormone ratio at ≥10 mg/kg, without affecting serum follicle-stimulating hormone levels. Di-n-octyl phthalate significantly induced Leydig cell hyperplasia (increased number of CYP11A1-positive Leydig cells) at 100 and 1000 mg/kg. Di-n-octyl phthalate down-regulates the gene expression of Cyp11a1, Hsd3b1 and Insl3 in individual Leydig cells. Di-n-octyl phthalate can also reduce the number of sperm in the epididymis. Di-n-octyl phthalate increased phosphorylated AKT1/AKT2 without affecting their total proteins, but increased the total protein and phosphorylated protein of ERK1/2 and GSK-3β. Primary immature Leydig cells isolated from 35-day-old rats were treated with 0–50 μM di-n-octyl phthalate for 3 h. This phthalate inhibited androgen production under basal, LH-stimulated, and cAMP-stimulated conditions by 5 and 50 μM in vitro via down-regulating Cyp11a1 expression but up-regulating Srd5a1 expression in vitro. In conclusion, di-n-octyl phthalate induces hypergonadotropic hypogonadism caused by Leydig cell hyperplasia but reduced steroidogenic function and prevents sperm production." @default.
• W3093140412 created "2020-10-22" @default.
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• W3093140412 date "2021-01-01" @default.
• W3093140412 modified "2023-10-13" @default.
• W3093140412 title "Exposure to di-n-octyl phthalate during puberty induces hypergonadotropic hypogonadism caused by Leydig cell hyperplasia but reduced steroidogenic function in male rats" @default.
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• W3093140412 doi "https://doi.org/10.1016/j.ecoenv.2020.111432" @default.
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