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• W1981703448 abstract "Renal ammonium excretion is increased by potassium depletion and reduced by potassium loading. To determine whether changes in potassium concentration would alter ammonia transport in the medullary thick ascending limb (MAL), tubules from rats were perfused in vitro and effects of changes in K concentration within the physiological range (4-24 mM) were evaluated. Increasing K concentration from 4 to 24 mM in perfusate and bath inhibited total ammonia absorption by 50% and reduced the steady-state transepithelial NH+4 concentration gradient. The inhibition of total ammonia absorption was reversible and occurred when K replaced either Na or N-methyl-D-glucamine. Increasing K concentration in the luminal perfusate alone gave similar inhibition of total ammonia absorption. At 1-2 nl/min per mm perfusion rate, increasing K concentration in perfusion and bathing solutions had no significant effect on transepithelial voltage. With either 4 or 24 mM K in perfusate and bath, an increase in luminal perfusion rate markedly increased total ammonia absorption. Thus, both potassium concentration and luminal flow rate are important factors capable of regulating total ammonia transport by the MAL. Changes in systemic potassium balance may influence renal ammonium excretion by affecting NH+4 absorption in the MAL and altering the transfer of ammonia from loops of Henle to medullary collecting ducts." @default.
• W1981703448 created "2016-06-24" @default.
• W1981703448 creator A5063127986 @default.
• W1981703448 date "1987-11-01" @default.
• W1981703448 modified "2023-10-14" @default.
• W1981703448 title "Effects of potassium on ammonia transport by medullary thick ascending limb of the rat." @default.
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• W1981703448 doi "https://doi.org/10.1172/jci113213" @default.
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