Abstract
To investigate the voiding function in a rat model of lumbar canal stenosis (LCS) using pharmacologic and molecular approaches. Sixty-one female Sprague-Dawley rats were broadly split into a sham and an LCS group. A hole was surgically drilled in the L5-L6 epidural space and filled with a rectangular piece of silicone rubber. Metabolic cage study at week 2 and continuous cystometry (CMG) under urethane anesthesia at weeks 2 and 4 were performed. During CMG, prostaglandin E2 or sulprostone, an prostaglandin E receptor 1 and prostaglandin E receptor 3 agonist was administered locally and intravenously, respectively, and the bladder was then harvested for histology and Western blot. Compared with sham, the LCS group showed dribbling urination and progressive increase in bladder size. CMG under urethane anesthesia in the LCS group was marked by overflow incontinence and acontractile bladder. Administration of intravesical prostaglandin E2 (200 μM) or intravenous sulprostone (0.1 mg/kg) in the sham group induced bladder overactivity, but decreased the compliance and failed to restore the bladder emptying function in the LCS group. The LCS group showed edematous changes and muscle thinning at week 2, which were partially restored by ...Continue Reading
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