New unstable bladder model in hypercholesterolemia rats

Area of Science:

• Urology
• Cardiovascular Science
• Animal Models

Background:

• Erectile dysfunction (ED) and overactive bladder (OAB) are common conditions.
• Shared pathophysiological mechanisms between ED and OAB are increasingly recognized.
• A reliable animal model is needed to investigate these shared mechanisms.

Purpose of the Study:

• To establish and evaluate a novel vasculogenic erectile dysfunction (ED) rat model in hypercholesterolemic rats.
• To assess the voiding function in this new ED model.
• To explore potential shared mechanisms between ED and OAB.

Main Methods:

• Induction of hypercholesterolemia and vasculogenic ED in Sprague-Dawley rats using a cholesterol-enriched diet and NG-nitro-L-arginine methyl ester.
• Evaluation of voiding function via cystometrography.
• Assessment of detrusor muscle contractility and pathological examination of the detrusor.

Main Results:

• Hypercholesterolemic rats exhibited significantly elevated serum cholesterol and body weight.
• Cystometrography revealed shorter voiding intervals and smaller functional bladder volumes in the cholesterol group.
• Detrusor strip studies showed increased spontaneous activity and a higher proportion of purinergic components in the cholesterol-fed rats.

Conclusions:

• The developed vasculogenic ED rat model displays significantly frequent voiding, indicative of overactive bladder symptoms.
• These findings support the hypothesis that ED and OAB may share common pathophysiological features or stem from a systemic disorder.
• This hypercholesterolemic rat model is a valuable tool for investigating the mechanisms underlying both ED and OAB.