NS-49, an alpha 1A-adrenoceptor agonist, selectively increases intraurethral pressure in dogs

European Journal of Pharmacology
N TaniguchiK Kimura

Abstract

The effects of NS-49 ((R)-(-)-3'-(2-amino-1-hydroxyethyl)-4'-fluoromethane sulfonanilide hydrochloride), an alpha 1A-adrenoceptor-selective agonist, on intraurethral pressure and blood pressure were investigated in anesthetized dogs. In addition, the contractile effects of NS-49 on the isolated dog urethra and carotid artery were compared with those of non-selective alpha 1-adrenoceptor agonists. Intravenously (i.v.) administered NS-49 at 0.3 microgram/kg or more significantly increased intraurethral pressure in a dose-dependent manner. Much higher doses of NS-49 were needed to increase blood pressure. In contrast, ST-1059 (1-(2',5'-dimethoxyphenyl)-2-aminoethanol) (an active metabolite of midodrine) at 30 micrograms/kg or more significantly increased both intraurethral pressure and blood pressure. NS-49 was 11-fold more selective for intraurethral pressure than ST-1059, NS-49, ST-1059, phenylephrine and noradrenaline caused concentration-dependent contraction of the isolated dog urethra. NS-49 caused only a slight contraction of the dog carotid artery even at high concentrations, whereas the reference drugs caused contractions of the artery with high efficacy. The alpha 1A-adrenoceptor-selective antagonists 5-methyl-urapidil a...Continue Reading

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Citations

Dec 12, 2001·International Journal of Urology : Official Journal of the Japanese Urological Association·H KiwamotoT Kurita
Oct 17, 1998·British Journal of Urology·T B PouyetD J Martin
Mar 17, 2004·Clinical Obstetrics and Gynecology·Adam P Klausner, William D Steers
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Aug 10, 1999·Biopharmaceutics & Drug Disposition·H Mukai, A Morino

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