title: Studies on the mechanism and characteristics of action of a uricosuric diuretic, indacrinone (MK-196).
abstract: 1 The renal action of indacrinone (MK-196), a phenoxyacetic acid derivative with diuretic and uricosuric properties, has been studied in fifteen male subjects. 2 Increasing single doses of up to 60 mg of oral indacrinone produced a linear increase in urinary volume and excretion of Na+ and Cl-, whilst the responses of urinary K+, Ca2+, Mg2+ and uric acid excretion, rose to a plateau at the 40 mg dose. 3 Indacrinone evoked a rapid diuretic response which reached a maximum of 2-4 h and was largely complete at 8-12 h after administration. 4 During maximal hydration, indacrinone produced a substantial fall in fractional free water clearance (CH2O), from 8.89% to 5.83% of the filtered load of water, associated with an increase in osmolal clearance, from 1.38% to 5.78% of the filtered load of solute. The reduction in CH2O was of the same order as that produced by a dose of ethacrynic acid with comparable saluretic activity and significantly greater than that produced by an equi-saluretic dose of hydrochlorothiazide. These findings imply an action of indacrinone upon solute transport in the diluting segments of the distal tubule. 5 At the time of maximal indacrinone-induced saluresis, which amounted to an increase from 0.48% to 4.61% of the filtered load of NaCl, fractional urate clearance increased from 5.16% to 12.24% of the filtered load of uric acid. 6 Indacrinone is a long acting diuretic, sharing some properties in common with both loop diuretics and benzothiadiazines. The results are discussed in relation to structure-activity amongst derivatives of phenoxyacetic acid.
mesh_terms: D004231:Diuresis / Q000187:drug effects; D004232:Diuretics / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004573:Electrolytes / Q000652:urine; D006801:Humans; D007189:Indans / Q000494:pharmacology*; D007192:Indenes / Q000494:pharmacology*; D008297:Male; D014508:Urea / Q000378:metabolism; D014527:Uric Acid / Q000378:metabolism; D014528:Uricosuric Agents / Q000494:pharmacology*
chemical_list: D004232:Diuretics; D004573:Electrolytes; D007189:Indans; D007192:Indenes; D014528:Uricosuric Agents; D014527:Uric Acid; D014508:Urea; C013352:indacrinone