Water avoidance stress induces frequency through cyclooxygenase-2 expression: a bladder rat model.

Area of Science:

• Urology
• Stress Physiology
• Molecular Biology

Background:

• Water avoidance stress is a potent stressor linked to visceral hyperalgesia and bladder dysfunction resembling interstitial cystitis.
• Cyclooxygenase-2 (COX-2) inhibitors show promise in managing urinary frequency in both clinical and experimental models.

Purpose of the Study:

• To investigate the impact of water avoidance stress on voiding patterns in rats.
• To examine the expression of cyclooxygenase-2 (COX-2) in the bladder tissue of rats subjected to water avoidance stress.
• To evaluate the therapeutic potential of a COX-2 inhibitor in mitigating stress-induced bladder changes.

Main Methods:

• Rats were exposed to water avoidance stress or a sham procedure.
• Voiding patterns were assessed using metabolic cage analysis and cystometrography.
• COX-2 messenger RNA and protein expression were quantified via RT-PCR, immunohistochemistry, and western blotting.
• The effects of the COX-2 inhibitor etodolac were examined.

Main Results:

• Water avoidance stress significantly reduced voiding interval and volume.
• Elevated COX-2 messenger RNA and protein levels were observed in the bladders of stressed rats, with expression localized to smooth muscle cells.
• Pretreatment with the COX-2 inhibitor etodolac reversed the stress-induced alterations in voiding patterns and COX-2 expression.

Conclusions:

• Chronic stress may induce urinary frequency via upregulation of cyclooxygenase-2 (COX-2) gene expression in bladder smooth muscle cells.
• Targeting COX-2 in the context of water avoidance stress may offer new therapeutic strategies for interstitial cystitis.