File
Authors
Keywords
lower urinary tract function
prostate
rat
testosterone
Abstract
Testosterone has been clinically used to improve hormone deficiency in the aging male; however, investigations how testosterone exerts its effects on lower urinary tract functions are not many. In order to shed light on the efficacy of testosterone on the functions, we replaced teststerone in elderly male Wistar rats aged 19 months. A relevant dose (120 mg) of testosterone was subcutaneously replaced through an implanted silastic tube into 6 rats for 4 weeks (treated group). Another 6 rats received no treatment for 4 weeks (control group). After the end of the 4-week period, we measured plasma testesterone, weight of bladder, prostate and body, bladder muscle content, spontaneous micturition behavior and cystometric parameters, and compared the results between the 2 groups. The daily micturition frequency (18.8 ± 1.5 times/day versus 15.5 ± 1.9 times/day), volume of residual urine at cystometry (0.66 ± 0.10 mL versus 0.24 ± 0.03 mL), bladder capacity (1.03 ± 0.06 mL versus 0.65 ± 0.05 mL), bladder weight (258 ± 9 mg versus 198 ± 19 mg), prostate weight (2.08 ± 0.22 g versus 1.29 ± 0.22 g) and ratio of smooth muscle area/connective tissue area (3.59 ± 0.13 versus 2.59 ± 0.36) were significantly higher in the treated group (P < 0.05). In contrast, the average volume of spontaneous micturition was significantly lower in the treated group (0.84 ± 0.07 mL versus 0.98 ± 0.09 mL). Differences in body weight and volume of 24-h urine were not significant between groups. Daily micturition frequency and volume of residual urine at cystometry were increased in the treated group. Testosterone replacement exerted unfavorable effects on the lower urinary functions of elderly rats, including prostatic hypertrophy.
Publisher
Tottori University Faculty of Medicine
Content Type
Journal Article
ISSN・ISBN
1346-8049
NCID
AA00892882
Journal Title
Yonago Acta medica
Current Journal Title
Yonago Acta medica
Volume
48
Issue
4
Start Page
93
End Page
99
Published Date
2005-12
Text Version
Publisher
Rights
Yonago Acta medica 編集委員会
Citation
Yonago Acta medica. 2005, 48(4), 93-99
Department
Faculty of Medicine/Graduate School of Medical Sciences/University Hospital
Language
English