title: Male fertility in rats treated with etretinate for 4 weeks.
abstract: The toxicity of Etretinate, a retinoid compound, on the male reproductive system was studied in male rats. The drug was administered for four weeks at the dose levels of 0 (control: Vehicle, Peanut oil), 5 and 25 mg/kg/day. The animals were then allowed to mate, and their male reproductive functions and organs were examined in detail. No significant changes due to toxicity were observed in male reproductive functions and organs in the 5 mg/kg/day group after the 4-week treatment. In contrast, males in the 25 mg/kg/day group showed drug-related changes in their reproductive performance (decrease of mating ability and fertility rate), testosterone blood level, sperm head counts, sperm viability and number in the caudal epididymis, organ weight and in the histopathology of their reproductive organs (atrophy of seminiferous tubules, necrosis of spermatocytes and spermatids, vacuolation of nuclei of spermatocytes and spermatids). Even though Etretinate belong to the retinoid group of compounds, the changes seen in the 25 mg/kg/day group were almost the same as those observed in Vitamin A-deficient animals. In conclusion, there is a correlation between changes due to toxicity observed for parameters of male fertility and for histopathological evaluation of the testis of rats that receiving high dose, treatment with Etretinate for 4 weeks.
authors.affiliation: Department of Toxicology and Pathology, Nippon Roche K. K., Research Center, Kanagawa, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Hayashi
authors.forename: S
authors.initials: S
authors.lastname: Takizawa
authors.forename: N
authors.initials: N
authors.lastname: Fukatsu
authors.forename: I
authors.initials: I
authors.lastname: Imamura
authors.forename: K
authors.initials: K
authors.lastname: Shimura
authors.forename: I
authors.initials: I
authors.lastname: Horii
mesh_terms: D000818:Animals; D001835:Body Weight / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D004334:Drug Administration Schedule; D004435:Eating / Q000187:drug effects; D005050:Etretinate / Q000008:administration & dosage / Q000633:toxicity*; D005260:Female; D005298:Fertility / Q000187:drug effects*; D006728:Hormones / Q000097:blood; D007641:Keratolytic Agents / Q000008:administration & dosage / Q000633:toxicity; D008136:Longevity / Q000187:drug effects; D008297:Male; D009929:Organ Size / Q000187:drug effects; D011247:Pregnancy; D051381:Rats; D017207:Rats, Sprague-Dawley; D013076:Sperm Count / Q000187:drug effects; D013077:Sperm Head / Q000187:drug effects; D013094:Spermatozoa / Q000187:drug effects; D013737:Testis / Q000187:drug effects / Q000473:pathology
chemical_list: D006728:Hormones; D007641:Keratolytic Agents; D005050:Etretinate