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Mechanism of action and structural requirements of vasopressin analog inhibition of transepithelial water flux in toad urinary bladder

Mann, W.A.; Stassen, F.; Huffman, W.; Kinter, L.B.

Journal of Pharmacology and Experimental Therapeutics 238(2): 401-406

1986

ISSN/ISBN: 0022-3565
PMID: 3090234
Document Number: 272259
Vasopressin, vasopressin analogs, forskolin and 8-bromo-cyclic AMP (8Br-cAMP) were studied for their effects on transepithelial water flux in toad urinary bladder. Arginine vasopressin, arginine vasotocin, oxytocin, desamino-8-D arginine vasopressin, forskolin and 8Br-cAMP stimulated hydro-osmotic water flux in a dose-dependent fashion. The rank order of potency was arginine vasotocin greater than arginine vasopressin greater than oxytocin greater than desamino-8-D-arginine vasopressin greater than forskolin greater than 8Br-cAMP. The vasopressin analogs [1-(beta-mercapto-beta,beta-cyclopentamethylene propionic acid),2-(O-methyl)tyrosine,8-arginine]vasopressin (SK&F 100273), [1-(beta-mercapto-beta,beta-cyclopentamethylene propionic acid),2-(O-methyl)tyrosine,4-valine,8-arginine]vasopressin (SK&F 100501), [1-(beta-mercapto-beta,beta-cyclopentamethylene propionic acid),2-D-tyrosine,4-valine,8-arginine]vasopressin (SK&F 100885), [1-(beta-mercapto-beta,beta-cyclopentamethylene propionic acid),2-(O-ethyl)tyrosine,4-valine,8-arginine]vasopressin (SK&F 100398), [1-(beta-mercapto-beta,beta-cyclopentamethylene propionic acid),2-D-isoleucine,4-valine,8-arginine]vasopressin (SK&F 101485), [1-(beta-mercapto-beta,beta-cyclopentamethylene propionic acid),2-(O-ethyl)-tyrosine,4-valine,8-arginine]vasopressin (SK&F 101498), [1-(beta-mercapto-beta,beta-cyclopentamethylene propionic acid),2-(O-ethyl)D-tyrosine,4-valine,8-arginine,9-desglycine]vasop ressin (SK&F 101926) and [1-(beta-mercapto-beta-beta-cyclopentamethylene propionic acid),2-D-phenylalanine,4-valine,8-arginine] vasopressin (SK&F 101071) antagonized arginine vasopressin-stimulated water flux and displaced the agonist dose-response relationship to the right in a parallel fashion. The most potent antagonists were those having the (O-ethyl)-D-tyrosine substitution at position 2. None of the antagonists tested had any effect on 8Br-cAMP-stimulated water flux at concentrations up to 10(-6)M.

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