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- W2100472557 abstract "Parabens are in widespread use as preservatives in drugs. In the late 1990 s, concerns were raised about their capacity to disrupt endocrine function based on in vitro data and in vivo uterotrophic tests. Studies in juvenile male rats provided conflicting results on pospubertal sperm production. In an exploratory pharmacokinetic study, Wistar male rats received a single dose of propylparaben (PP) at 3, 10, 100, or 1000 mg/kg, orally on postnatal day (PND) 31. Plasma PP concentrations were quantifiable up 8h after dosing with a mean T max value of 15 min. Distribution was 4.8 l/kg, the plasma elimination half-life was 47 min, and clearance was 4.20 (l/h)/kg at 10mg/kg. A sulfoconjugated metabolite was detected. In the juvenile toxicology study, PP was orally administered by gavage to 20 Wistar male rats at doses of 3, 10, 100, or 1000 mg/kg/day in 1% hydroxyethylcellulose for 8 weeks starting on PND21. A first subgroup of 10 males/dose was necropsied immediately after the 8-week exposure period; a second subgroup of 10 males/dose was necropsied after a 26-week washout period. Blood samples were taken from additional satellite animals after dosing on PND21 and PND77 for toxicokinetic analysis. There was no evidence of an effect of PP on the weight of the male reproductive organs, epididymal sperm parameters, hormone levels, or histopathology. The dose of 1000 mg/kg/day was the no-observed adverse effect level, corresponding to a maximum plasma concentration of 12,030 ng/ml and exposure to 47 760 ng · h/ml (AUC0-8 h) at the end of the treatment." @default.
- W2100472557 created "2016-06-24" @default.
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- W2100472557 creator A5054206271 @default.
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- W2100472557 date "2013-09-25" @default.
- W2100472557 modified "2023-10-09" @default.
- W2100472557 title "Oral Propylparaben Administration to Juvenile Male Wistar Rats Did Not Induce Toxicity in Reproductive Organs" @default.
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- W2100472557 doi "https://doi.org/10.1093/toxsci/kft211" @default.
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