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Mild brain ischemia produces bladder hyperactivity without brain damage in rats
Satoshi Yotsuyanagi1, Kazutaka Narimoto, Mikio Namiki
1Department of Urology, Kanazawa University School of Medicine, Kanazawa, Ishikawa, Japan. syotsu@d2.dion.ne.jp
Urologia Internationalis
|July 11, 2006
Summary
Mild brain ischemia without infarction causes bladder overactivity and memory deficits in rats. This finding suggests a link between reduced cerebral blood flow and urinary dysfunction in aging humans.
Area of Science:
- Neuroscience
- Urology
Background:
- The impact of brain ischemia without infarction on bladder control remains unclear.
- Investigating chronic cerebral hypoperfusion (CH) effects on bladder activity is crucial.
Purpose of the Study:
- To examine the influence of chronic cerebral hypoperfusion (CH) on bladder activity in rats.
- To assess the relationship between reduced cerebral blood flow and voiding function.
Main Methods:
- CH was induced in rats via surgical manipulation of carotid arteries and jugular vein.
- Voided volume and frequency were measured, alongside bladder activity using cystometrography (CMG).
- Cognitive function was evaluated using the Morris water maze, and brain tissue was analyzed.
Main Results:
- CH rats exhibited significantly reduced voided volume and increased voiding frequency compared to controls.
- Bladder capacity was significantly decreased in CH rats two weeks post-induction.
- CH impaired learning in the Morris water maze, despite no visible cerebral infarction.
Conclusions:
- Mild forebrain ischemia without infarction leads to bladder hyperactivity and memory impairment.
- This model suggests mild brain ischemia may contribute to overactive bladder in aging humans.
- Further research using this model could inform therapies for age-related voiding dysfunction.