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Neuromodulation reduces urinary frequency in rats with hydrochloric acid-induced cystitis
1Urology Research Laboratory, Division of Urology, Toronto Western Hospital, University of Toronto, Toronto, Canada.
BJU International
|November 9, 2000
Summary
Sacral neuromodulation reduced urinary frequency in rats with cystitis. However, this treatment did not inhibit afferent c-fiber activity, suggesting alternative mechanisms for its therapeutic effect in interstitial cystitis.
Area of Science:
- Neuroscience
- Urology
- Cell Biology
Background:
- Interstitial cystitis (IC) is a chronic condition characterized by bladder pain and urinary urgency.
- Current treatments for IC are often ineffective, necessitating research into novel therapeutic approaches.
- Sacral neuromodulation (SNM) is a potential treatment modality for lower urinary tract dysfunction.
Purpose of the Study:
- To investigate the efficacy of sacral neuromodulation in a rat model of interstitial cystitis (IC).
- To elucidate the underlying mechanisms by which SNM may alleviate IC symptoms, specifically focusing on c-fos expression as a marker of neuronal activity.
Main Methods:
- Twenty Sprague-Dawley rats were divided into four groups: normal controls, sham treatment (HCl-induced cystitis + saline), sham treatment (HCl-induced cystitis + acetic acid), and a stimulated group (HCl-induced cystitis + acetic acid + electrical stimulation).
- Electrical stimulation was applied to the S1 dorsal foramina for 8 hours daily over 3 weeks.
- Bladder instillation of acetic acid was used to induce c-fos expression, a marker of neuronal activation, and immunocytochemistry was employed to quantify fos-positive neurons in the L6 spinal cord segment.
Main Results:
- Intravesical HCl instillation significantly increased micturition frequency in sham groups.
- Electrical stimulation in the SNM group significantly reduced micturition frequency compared to sham groups (P=0.04).
- No significant difference in the number of fos-positive neurons was observed between the stimulated and sham + acetic acid groups, indicating SNM did not inhibit afferent c-fiber activity.
Conclusions:
- Sacral neuromodulation effectively reduced urinary frequency in rats with HCl-induced cystitis.
- The therapeutic effect of SNM in this model is not mediated by the inhibition of afferent c-fiber activity.
- Further research is needed to fully understand the neurobiological mechanisms underlying sacral neuromodulation's efficacy in treating interstitial cystitis.