title: Effect of anti-androgen (TZP-4238) on steroid-induced canine prostatic hyperplasia. Light and electron microscopic investigations.
abstract: The effect of a synthetic steroidal anti-androgen, TZP-4238, on steroid-induced canine prostatic hyperplasia was studied by light and electron microscopy. Male beagle dogs (1-2 years old) were divided into four experimental groups. Group 1 consisted of intact controls. The other animals were castrated. The castrated animals were treated for 25 weeks with 1) 5 alpha-androstane-3 alpha, 17 beta-diol (A-diol) plus 17 beta-estradiol (E2) (Group 2), 2) A-diol plus E2 + TZP-4238 0.5 mg/kg (Group 3) and 3) A-diol plus E2 + chlormadinone acetate (CMA) 2.5 mg/kg (Group 4). TZP-4238 and CMA were administered orally for 21 weeks after 4 weeks treatment with A-diol plus E2. In group 2, glandular hyperplasia of the prostate was clearly noted. In contrast, combined treatment with TZP-4238 (Group 3) or CMA (Group 4) produced marked atrophy of the glandular epithelium. Loss of secretory and metabolic activities was confirmed by ultrastructural investigations. Our data indicate that TZP-4238 is a potent anti-androgen for the prevention of canine prostatic hyperplasia in the steroid-induced benign prostatic hyperplasia (BPH) model.
authors.affiliation: Department of Safety Research, Teikoku Hormone Mfg. Co. Ltd., Kawasaki, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Murakoshi
authors.forename: R
authors.initials: R
authors.lastname: Inada
authors.forename: M
authors.initials: M
authors.lastname: Makino
authors.forename: M
authors.initials: M
authors.lastname: Suzuki
authors.forename: M
authors.initials: M
authors.lastname: Mieda
authors.forename: S
authors.initials: S
authors.lastname: Honma
authors.forename: H
authors.initials: H
authors.lastname: Yamanaka
mesh_terms: D000284:Administration, Oral; D000726:Androgen Antagonists / Q000494:pharmacology*; D015113:Androstane-3,17-diol; D000818:Animals; D002715:Chlormadinone Acetate / Q000031:analogs & derivatives* / Q000494:pharmacology; D004285:Dogs; D004958:Estradiol; D008297:Male; D008854:Microscopy, Electron; D009919:Orchiectomy; D009929:Organ Size; D011470:Prostatic Hyperplasia / Q000139:chemically induced* / Q000473:pathology / Q000517:prevention & control
chemical_list: D000726:Androgen Antagonists; D002715:Chlormadinone Acetate; D015113:Androstane-3,17-diol; D004958:Estradiol; C069297:osaterone acetate