Therapeutic effect of TAC-302, a cyclohexenoic fatty alcohol derivative, on bladder denervation-related storage and voiding dysfunctions in rats.

AIMS

To evaluate the therapeutic effect of TAC-302, a cyclohexenoic fatty alcohol derivative, on bladder denervation-related storage and voiding dysfunctions in rats with bladder outlet obstruction (BOO).

METHODS

BOO was achieved by partial ligature of the proximal urethra in female rats. Two weeks later, BOO rats were divided into two groups and treated orally with vehicle or 10 mg/kg TAC-302 twice a day for 4 weeks. Urodynamic and immunohistochemical evaluation of the bladder muscle layer was performed. In another study, the BOO rats were treated with intravenous tamsulosin at cystometry. The detrusor contractility in each group was evaluated using the modified Shafer's nomogram.

RESULTS

Two weeks after BOO, the rats showed significant increases in non-voiding contraction (NVCs) and residual urine volume (RUV) compared to the sham group. Moreover, 6 weeks after BOO, BOO vehicle rats showed significant increases in NVCs and RUV and decreases in detrusor contractility and in the nerve fiber density in the urinary bladder compared to the sham group. BOO-induced denervation of the urinary bladder was partially improved by oral treatment with TAC-302. Oral treatment with TAC-302 significantly reduced the amplitude and frequency of NVCs (P < 0.05) and increased detrusor contractility and tended to reduce RUV compared with the BOO vehicle group. In contrast, the intravenous administration of tamsulosin significantly reduced the frequency of NVCs, but not RUV.

CONCLUSIONS

TAC-302 improved storage and voiding dysfunctions by improving bladder denervation and detrusor underactivity even when the treatment was started after storage and voiding dysfunctions had already occurred.