title: Reproductive toxicity of trenbolone acetate in embryonically exposed Japanese quail.
abstract: This study was conducted to assess the effects of a one time embryonic exposure to trenbolone acetate on reproductive development and function in Japanese quail (Coturnix japonica). Embryos were exposed to either 0.05, 0.5, 5, or 50microg trenbolone or a sesame oil vehicle control at embryonic day 4. Onset of puberty, gonadal histopathology, sperm motility, cloacal gland size, and male copulatory behavior were assessed in adults. Trenbolone delayed onset of puberty in males, inhibited cloacal gland development, and reduced male reproductive behaviors. Industry laboratories have shown trenbolone acetate to be non-teratogenic in mammalian studies. Our study, however, shows that this one time in ovo exposure delayed onset of puberty in and suppressed adult copulatory behavior in quail males. These results suggest that this one time embryonic exposure to trenbolone may have disrupted development of either the central nervous system or the hypothalamic-pituitary-gonadal axis. This is the first study to demonstrate a demasculinizing effect on copulatory behavior in Japanese quail from embryonic exposure to a non-aromatizable androgenic chemical. More studies are needed to determine the mechanisms behind the observed effects.
authors.affiliation: US Army Center for Health Promotion and Preventive Medicine, Directorate of Toxicology, Health Effects Research Program, Aberdeen Proving Ground, MD 21010, USA. michael.james.quinn@us.army.mil
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Quinn
authors.forename: Emma T
authors.initials: ET
authors.lastname: Lavoie
authors.forename: Mary Ann
authors.initials: MA
authors.lastname: Ottinger
mesh_terms: D000818:Animals; D003370:Coturnix / Q000196:embryology / Q000254:growth & development; D004625:Embryo, Nonmammalian / Q000187:drug effects*; D047108:Embryonic Development / Q000187:drug effects; D052244:Endocrine Disruptors / Q000633:toxicity*; D005260:Female; D008297:Male; D012726:Sexual Behavior, Animal / Q000187:drug effects*; D012741:Sexual Maturation / Q000187:drug effects*; D014204:Trenbolone Acetate / Q000031:analogs & derivatives* / Q000633:toxicity
chemical_list: D052244:Endocrine Disruptors; D014204:Trenbolone Acetate