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Intravesical protamine sulfate and potassium chloride as a model for bladder hyperactivity
Yao-Chi Chuang1, Michael B Chancellor, Satoshi Seki
1Division of Urology, Chang Gung Memorial Hospital, Kaohsiung, Taiwan.
Urology
|March 18, 2003
Summary
A new rat model for bladder hyperactivity uses protamine sulfate (PS) and potassium chloride (KCl) to mimic irritative bladder responses. This model effectively demonstrates how minor urothelial damage can trigger significant bladder overactivity.
Area of Science:
- Urology
- Pharmacology
- Animal Models
Background:
- Hyperactive bladder is a condition characterized by urinary urgency and frequency.
- Current animal models may not fully replicate the complex mechanisms of bladder irritation and hyperactivity.
Purpose of the Study:
- To develop and validate an acute animal model for hyperactive bladder in rats.
- To investigate the role of urothelial barrier function and afferent nerve activation in bladder hyperactivity.
Main Methods:
- Developed a model using intravesical infusion of protamine sulfate (PS) and potassium chloride (KCl) in urethane-anesthetized female rats.
- Performed continuous cystometrograms (CMGs) to measure bladder activity.
- Investigated the effects of varying concentrations of PS and KCl, and the impact of capsaicin pretreatment.
Main Results:
- High-concentration PS (30 mg/mL) induced significant bladder irritation (80.6% decrease in intercontraction interval).
- KCl infusion after low-concentration PS (10 mg/mL) also caused marked irritation (76.9-82.9% decrease).
- Capsaicin pretreatment delayed onset and reduced the magnitude of irritative effects.
Conclusions:
- The developed model effectively mimics bladder irritation and hyperactivity.
- Modest disruption of urothelial barrier function can lead to pronounced irritative bladder responses.
- This model is suitable for studying bladder irritation and hyperactivity, involving capsaicin-sensitive and potentially capsaicin-resistant afferents.