Int Neurourol J.  2015 Mar;19(1):19-26. 10.5213/inj.2015.19.1.19.

Mirodenafil Prevents Bladder Dysfunction Induced by Chronic Bladder Ischemia in Rats

• Choi H
• Bae JH
• Shim JS
• Park JY
• Moon DG
• Lee JG

• KMID: 2380822
• DOI: http://doi.org/10.5213/inj.2015.19.1.19

Abstract

PURPOSE
To investigate the protective effect of mirodenafil on bladder function in a rat model of chronic bladder ischemia (CBI).
METHODS
Twenty-four Sprague-Dawley rats were randomized to three groups: untreated, sham-operated rats (control group); untreated, CBI model rats (CBI group); and CBI rats treated daily with 4 mg/kg mirodenafil (CBI+mirodenafil group). The CBI and CBI+mirodenafil groups underwent endothelial injury to the iliac arteries and were fed a 2% cholesterol diet after injury. Four weeks after surgery, the CBI+mirodenafil group started daily treatment with mirodenafil for four weeks. Eight weeks after surgery, continuous in vivo cystometry and in vivo organ bath studies of detrusor muscle strips were performed.
RESULTS
in vivo cystometry revealed that the rats in the CBI group had a significantly higher micturition frequency, lower bladder capacity, and lower compliance than the rats in the control and CBI+mirodenafil groups. The detrusor muscle strip study showed that the magnitude of the carbachol-induced contractile response was significantly lower in the CBI group compared to either the control or CBI+mirodenafil group. Addition of daily mirodenafil after induction of CBI decreased the contractile response, compared to untreated CBI rats. CBI induced submucosal fibrosis and degenerative changes in bladder walls, which was reversed by the addition of mirodenafil.
CONCLUSIONS
Daily treatment with mirodenafil showed protective effects against bladder dysfunction resulting from CBI in rats.

Keyword

Ischemia; Urinary Bladder; Phosphodiesterase 5 Inhibitors

MeSH Terms

Animals
Baths
Cholesterol
Compliance
Diet
Fibrosis
Iliac Artery
Ischemia*
Models, Animal
Phosphodiesterase 5 Inhibitors
Rats*
Rats, Sprague-Dawley
Urinary Bladder*
Urination
Cholesterol
Phosphodiesterase 5 Inhibitors