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Effect of short-term outlet obstruction on rat bladder nerve density and contractility
M M Barendrecht1, P Chichester, M C Michel
1Department of Pharmacology and Pharmacotherapy, Academic Medical Center, Amsterdam, The Netherlands.
Autonomic & Autacoid Pharmacology
|January 4, 2007
Summary
Bladder outlet obstruction in rats initially impairs bladder contractility due to cellular dysfunction. Later, reduced nerve density (denervation) becomes the primary cause of weakened bladder contractions, impacting bladder function.
Area of Science:
- Urology
- Physiology
- Neuroscience
Background:
- Bladder outlet obstruction (BOO) is a common condition affecting bladder function.
- Early changes in bladder contractility following BOO are not fully understood.
- Investigating the relationship between nerve density and contractile function is crucial for understanding BOO pathophysiology.
Purpose of the Study:
- To examine the impact of early bladder outlet obstruction (BOO) on rat bladder contractility.
- To correlate changes in contractile responses with innervation density.
- To differentiate between cellular contractility and neural influences in early BOO.
Main Methods:
- Induction of bladder outlet obstruction (BOO) in rats for 1, 3, and 7 days.
- Measurement of bladder weight changes.
- Assessment of contractile responses to field stimulation and exogenous agonists (ATP, carbachol, KCl).
- Evaluation of neurofilament staining to determine innervation density.
Main Results:
- BOO significantly increased bladder weight over time.
- Field stimulation-induced contractions were reduced in BOO rats, most notably at 1 day, with incomplete recovery.
- Responses to exogenous agonists were reduced at 1 day but recovered by 7 days.
- Neurofilament staining decreased progressively, indicating reduced nerve density by 7 days of BOO.
Conclusions:
- Early reductions in field stimulation-induced contractions are likely due to impaired cellular contractility, possibly from surgical trauma.
- At later time points, reduced nerve density (partial denervation) becomes the main factor limiting contractile responses to field stimulation.
- These findings highlight distinct mechanisms contributing to bladder dysfunction at different stages of BOO.
