AY-31,906, a novel high ceiling diuretic: characterization of its relative potassium-sparing actions in rats and dogs.
AY-31,906, exo-2-amino-4-[(bicyclo[2.2.1]hept-2-yl)amino-N-[[1- methylethyl)amino]carbonyl]-5-pyrimidinesulfonamide, exhibited potent diuretic and natriuretic activity in rats and dogs. After p.o. administration, AY-31,906 was 1.5- and 12.3-times more potent as a natriuretic than furosemide in rats and dogs, respectively, whereas it was 0.5- and 6.1-times as potent after i.v. administration. The maximum natriuretic effect of AY-31,906 in both species was similar to that observed with furosemide. At equiactive natriuretic p.o. doses in both species, AY-31,906 produced a greater increase in the urinary ratio of Na/K than furosemide, indicating a relative potassium-sparing effect. AY-31,906 produced significant increases in the fractional excretion of sodium and chloride in dogs at a dose that produced no statistically significant changes in the fractional excretion of potassium, glomerular filtration rate or renal plasma flow. After p.o. administration, the onset of activity of AY-31,906 occurred within the 1st hr in both rats and dogs and preliminary data demonstrated that the activity lasted for approximately 2 hr in rats and 4 hr in dogs. Clearance studies in conscious dogs suggest that AY-31,906 inhibited electrolyte reabsorption in the ascending limb of the loop of Henle and, unlike furosemide, AY-31,906 had no activity at the proximal tubule. These results indicate that AY-31,906 is a potent, high ceiling diuretic with relative potassium-sparing properties. The compound is well absorbed after p.o. administration with diuretic activity occurring in the 1st hr.
Ackerman
D M
DM
Wyeth-Ayerst Research, Princeton, New Jersey.
Brady
M M
MM
MacLean
A G
AG
Smith
T M
TM
D000818:Animals; D001643:Bridged Bicyclo Compounds / Q000494:pharmacology*; D001952:Bridged-Ring Compounds / Q000494:pharmacology*; D004232:Diuretics / Q000494:pharmacology*; D004285:Dogs; D004305:Dose-Response Relationship, Drug; D005260:Female; D005665:Furosemide / Q000494:pharmacology; D008138:Loop of Henle / Q000187:drug effects; D008297:Male; D011188:Potassium / Q000378:metabolism*; D051381:Rats; D011919:Rats, Inbred Strains; D012079:Renal Circulation / Q000187:drug effects; D012964:Sodium / Q000378:metabolism
D001643:Bridged Bicyclo Compounds; D001952:Bridged-Ring Compounds; D004232:Diuretics; C062148:AY 31906; D005665:Furosemide; D012964:Sodium; D011188:Potassium