Abstract
To investigate the alterations in Connexin 43 (Cx43) and connexin 26 (Cx26) levels in the bladder outlet obstruction (BOO)-induced detrusor overactivity and examine the effect of connexin inhibitors on this condition. Fifty Sprague-Dawley rats were divided into 4 groups: sham-operated control group (n = 10), BOO group (n = 10), and 2 groups that were administered connexin inhibitors. The first of these 2 groups was administered 18β-glycyrrhetinic acid (BOO-18β-GA group, n = 15) and the second group was given oleamide (BOO-oleamide group, n = 15). Cystometrogram was performed in all groups after 2 weeks of obstruction. The expression levels of Cx26 and Cx43 were analyzed using immunohistochemical staining and Western blot. The intercontraction interval was markedly shorter in the BOO group compared with the control group (P <.05). Intercontraction intervals in the BOO-18β-GA and BOO-oleamide groups at 2 weeks were significantly longer than that observed for the BOO group (P <.05). The expression of Cx43 and Cx26 were increased in the BOO group. After administration of connexin inhibitors, downregulation of Cx43 and Cx26 was noted. These results suggest that upregulation of Cx43 and Cx26 induce detrusor overactivity after BOO, and connexin inhibitors may have some role in relieving BOO-induced detrusor overactivity in rats.
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