title: Collaborative work to evaluate toxicity on male reproductive organs by repeated dose studies in rats 3). Effects of repeated doses of ethinylestradiol for 2 and 4 weeks on the male reproductive organs.
abstract: Male Sprague-Dawley rats were subcutaneously administered 0.3 and 3.0 mg/kg/day of ethinylestradiol for 2 and 4 weeks. Two weeks treatment decreased body weight gain, food consumption, absolute weights of testis, epididymis, prostate and seminal vesicle, and relative weights of epididymis, prostate and seminal vesicle. On the other hand, it increased absolute and relative weights of pituitary and adrenal glands, and induced atrophy of Leydig cells, degeneration/necrosis of pachytene spermatocytes, vacuolar degeneration of Sertoli cells, and retention of spermatids. In addition to the changes found after 2 weeks treatment, 4 weeks treatment induced exfoliation of germinal cells, decreases in spermatid and multinucleated giant cell formation and relative weights of testis. These results suggest that examination of prostate and seminal vesicle weights and histopathological changes in the testis are important for evaluation of male reproductive toxicity of ethinylestradiol and 2 weeks treatment is sufficient to detect toxicity on male reproductive organs.
authors.affiliation: Applied Research Central Research Laboratories, Zeria Pharmaceutical Co., Ltd., 2512-1 Oshikiri, Kohnan-machi, Ohsato-gun, Saitama 360-0111, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Kinomoto
authors.forename: M
authors.initials: M
authors.lastname: Sawada
authors.forename: S
authors.initials: S
authors.lastname: Ogawa
authors.forename: A
authors.initials: A
authors.lastname: Iguchi
authors.forename: A
authors.initials: A
authors.lastname: Matsui
authors.forename: Y
authors.initials: Y
authors.lastname: Iino
authors.forename: Y
authors.initials: Y
authors.lastname: Shiraishi
authors.forename: N
authors.initials: N
authors.lastname: Nishi
authors.forename: Y
authors.initials: Y
authors.lastname: Mera
mesh_terms: D000311:Adrenal Glands / Q000187:drug effects / Q000473:pathology; D000818:Animals; D004435:Eating / Q000187:drug effects; D004958:Estradiol / Q000097:blood; D045166:Estradiol Congeners / Q000008:administration & dosage / Q000633:toxicity*; D004997:Ethinyl Estradiol / Q000008:administration & dosage / Q000633:toxicity*; D007279:Injections, Subcutaneous; D008297:Male; D009929:Organ Size / Q000187:drug effects; D010902:Pituitary Gland / Q000187:drug effects / Q000473:pathology; D011467:Prostate / Q000187:drug effects / Q000473:pathology; D051381:Rats; D017207:Rats, Sprague-Dawley; D012669:Seminal Vesicles / Q000187:drug effects / Q000473:pathology; D013737:Testis / Q000187:drug effects* / Q000473:pathology; D013997:Time Factors; D018675:Toxicity Tests; D015430:Weight Gain / Q000187:drug effects
chemical_list: D045166:Estradiol Congeners; D004997:Ethinyl Estradiol; D004958:Estradiol