Intradetrusor botulinum neurotoxin A (BoNT-A) injections decrease bladder fibrosis secondary to partial urethral...

Area of Science:

• Urology
• Pharmacology
• Histomorphology

Background:

• Partial urethral obstruction (PUO) in male rats causes bladder dysfunction, including muscle hypertrophy and increased connective tissue.
• These changes are associated with heightened contractile responses to neurogenic and pharmacological stimuli.

Purpose of the Study:

• To investigate the effects of botulinum toxin-A (BoNT-A) on bladder function and histomorphology in a male rat model of overactive bladder induced by PUO.

Main Methods:

• Male Sprague-Dawley rats underwent PUO to create an overactive bladder model.
• Groups received either saline or BoNT-A injections into the detrusor muscle.
• Bladder function and tissue morphology were assessed 5 and 30 days post-injection.

Main Results:

• BoNT-A significantly reduced PUO-induced bladder tissue changes, including hypertrophy and fibrosis.
• BoNT-A injections normalized bladder contractile responses to electrical field stimulation and carbachol.
• Histological changes were more prominent at 30 days post-saline injection compared to 5 days.

Conclusions:

• Intradetrusor BoNT-A injections effectively mitigate bladder overactivity and associated histopathological changes in a male rat model.
• BoNT-A appears to reduce bladder fibrosis secondary to PUO.
• These findings support BoNT-A as a potential therapeutic agent for managing overactive bladder.