Satoshi S1, Sasaki K 2, Igawa Y 1, Nishizawa O1, Chancellor M 3, de Groat W 4, Yoshimura N3 1. Dept. of Urology, Shinshu Univ, School of Medicine, 2. Dept. of Urology, Okayama Univ, School of Medicine, 3. Dept of Urology, Univ of Pittsburgh, 4. Dept of Pharmacology, Univ of Pittsburgh