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AJP - Renal Physiology, Vol 256, Issue 5 932-F941, Copyright © 1989 by American Physiological Society
ARTICLES |
G. Malnic, R. W. Berliner and G. Giebisch
Department of Physiology, Yale University School of Medicine, New Haven, Connecticut 06510.
Superficial distal tubules were pump perfused (range 0-35 nl/min), generally with solutions similar in composition to early distal tubule fluid, in control, K+-depleted, acutely K+-loaded, and K+-adapted rats with the use of double-barreled resin-reference microelectrodes to measure K+ and Na+ activities and transepithelial potential differences (PD). When perfusion rate decreased from 35 to 5 nl/min in control animals, [K+] increased from 2 mM to between 10 and 20 mM, remaining at these levels as perfusion rate was decreased further. In low-K+ rats, the change in K+ activity with flow was greatly attenuated. In K+-loaded and K+-adapted rats, [K+] was higher than in controls at all flow rates. Na+ concentrations and lumen-negative PD increased with high flow rates in control rats. Addition of 10(-3) M amiloride blocked the increase in luminal K+ with low flow rates. In the physiological range of late distal flow rates, luminal [K+] remains constant and similar to the concentration attained in the steady state. At higher flow rates, [K+] declines, and K+ balance, PD, and Na+ reabsorption modulate the relationship between K+ secretion and flow rate.
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