Establishment of a prostatic hyperplasia model with beagle dogs

Objective: To establish a prostatic hyperplasia model with beagle dogs. Methods: Twenty-four male beagle dogs, 2 years of age, were divided into the treatment and control groups at random and were administrated testosterone propionate (TP) i.m. two months after castration. Three treatment groups were set with the doses of TP at 0.8 mg/kg, 2.5 mg/kg and 7.5 mg/kg, respectively, and the control was given the same volume of vehicle. Two months later, half of the animals were killed and sera samples were obtained. The wet weight and volume of prostate were measured. The dihydro testosterone (DHT) level of the serum and prostate were determined with the commercial radioimmunoassay (RIA) kit. The prostate was sectioned, fixed and stained with hematoxylin and eosin. Pictures were taken with a digital camera under the microscope and were analyzed with a computer for the epithelial cell height and the acinar luminal area with micro image analysis software. The prostate volume was measured with ultrasonic diagnost

Establishment of a prostatic hyperplasia model with beagle dogs

Objective: To establish a prostatic hyperplasia model with beagle dogs. Methods: Twenty-four male beagle dogs, 2 years of age, were divided into the treatment and control groups at random and were administrated testosterone propionate (TP) i.m. two months after castration. Three treatment groups were set with the doses of TP at 0.8 mg/kg, 2.5 mg/kg and 7.5 mg/kg, respectively, and the control was given the same volume of vehicle. Two months later, half of the animals were killed and sera samples were obtained. The wet weight and volume of prostate were measured. The dihydro testosterone (DHT) level of the serum and prostate were determined with the commercial radioimmunoassay (RIA) kit. The prostate was sectioned, fixed and stained with hematoxylin and eosin. Pictures were taken with a digital camera under the microscope and were analyzed with a computer for the epithelial cell height and the acinar luminal area with micro image analysis software. The prostate volume was measured with ultrasonic diagnostic instrument before castration, 2 months after castration and 2 months after TP treatment. Results: The prostate volume was smaller at two month after castration than before castration (P<0.05) and after TP treatment for 2 months; the prostate volumes of all treatment groups were larger than those of the controls (P<0.01). The wet weight of the prostate was higher in the treatment groups than in the controls (P<0.05) both having a dose-dependent relationship. The DHT levels of the serum and the prostate were increased with increasing TP dosage. The acinar luminal area of the prostate was enlarged and the epithelial cell height was increased with larger dose of TP. Conclusion: A prostatic hyperplasia model is established in castrated beagle dogs with TP administration.