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Int Neurourol J > Volume 14(1); 2010 > Article
Fundamental Science for Neurourology
International Neurourology Journal 2010;14(1): 48-53.
DOI: https://doi.org/10.5213/inj.2010.14.1.48   
Distribution of Interstitial Cells of Cajal in Menopausal Rat Urinary Bladder Showing Detrusor Overactivity.
Sun Ouck Kim, Seung Hee Song, Kyu Youn Ahn, Dong Deuk Kwon
1Department of Urology, Chonnam National University Medical School, Gwangju, Korea. seinsena@hanmail.net
2Department of Anatomy, Chonnam National University Medical School, Gwangju, Korea.
ABSTRACT
PURPOSE
Recent studies have showed that interstitial cells of Cajal (ICCs) are widely distributed in the genitourinary tract and have suggested their involvement in spontaneous electrical activity and muscle contraction. The purposes of this study were to investigate the effect of estrogen on ICCs in rat urinary bladder from the detrusor overactivity induced by ovariectomy.
MATERIALS AND METHODS
Female Sprague-Dawley rats (230-240 g, N=60) were divided into three groups: control (N=20), bilateral ovariectomy (Ovx, N=20), and bilateral ovariectomy followed by subcutaneous injections of 17 beta-estradiol (50 mg/kg/day, Ovx + Est, N=20). After 4 weeks, urodynamic studies measuring contraction interval and contraction pressure were done. The cellular localization of ICCs was determined by immunohistochemistry in the rat urinary bladder.
RESULTS
Filling cystometry studies demonstrated a reduced interval between voiding contractions and an increased voiding pressure in Ovx group. The approximate the contraction interval (min) was (3.9+/-0.25) significantly decreased in the Ovx group compared to the control group (6.7+/-0.15), which was increased after estrogen treatment (9.7+/-0.22) (p<0.05). Conversely, the average contraction pressures (mmHg) were increased in the Ovx group (28.9+/-2.1) compared to the control group (21.2+/-1.45), and decreased after estrogen treatment (24.8+/-2.21) (p<0.05). The population of c-Kit immunoreactive ICCs was decreased in both the urothelial and muscle layers in Ovx bladders, which increased to the control value after estrogen treatment.
CONCLUSIONS
These results demonstrated an decreased immunoreactivity of ICCs in the menopausal rat model and suggest that thedecreased population of ICCs expression may contribute to the modulation of bladder overactivity induced by menopause.
Keywords: Interstitial cell; Urinary bladder; Menopause


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