title: [Examination of the mechanism of ameliorating effect of alpha 1-blocker on storage symptoms associated with benign prostatic hyperplasia].
abstract: To investigate the mechanism of the ameliorating effect of alpha1-blocker on storage symptoms associated with benign prostatic hyperplasia (BPH), we evaluated the effect of tamsulosin on the bladder blood flow in rats with bladder outlet obstruction (BOO). BOO was produced by ligature in the part around a proximal urethra and kept for 2 weeks. Tamsulosin was subcutaneously administered with an osmotic pump for 2 weeks immediately after the BOO operation. Bladder blood flow in the sham-operated rats, the control BOO rats and the tamsulosin-treated BOO rats was measured by the fluoro-microsphere method. Bladder blood flow was significantly reduced in BOO rats compared with sham-operated rats, and tamsulosin significantly increased the bladder blood flow in BOO rats. The present results suggest that the increase in bladder blood flow by tamsulosin contributes to the improvement of storage symptoms associated with BPH.
authors.affiliation: Department of Urology, Kinki University School of Medicine.
authors.forename: Seiji
authors.initials: S
authors.lastname: Matsumoto
authors.forename: Hirotsugu
authors.initials: H
authors.lastname: Uemura
mesh_terms: D058668:Adrenergic alpha-1 Receptor Antagonists; D000317:Adrenergic alpha-Antagonists / Q000494:pharmacology / Q000627:therapeutic use*; D000818:Animals; D005260:Female; D008297:Male; D011470:Prostatic Hyperplasia / Q000188:drug therapy*; D011817:Rabbits; D051381:Rats; D013449:Sulfonamides / Q000494:pharmacology / Q000627:therapeutic use*; D000077409:Tamsulosin; D053201:Urinary Bladder, Overactive / Q000188:drug therapy*
chemical_list: D058668:Adrenergic alpha-1 Receptor Antagonists; D000317:Adrenergic alpha-Antagonists; D013449:Sulfonamides; D000077409:Tamsulosin