TY - JOUR
T1 - Mechanisms of antinatriuresis during low-frequency renal nerve stimulation in anesthetized dogs
AU - Osborn, J. L.
AU - Roman, R. J.
AU - Harland, R. W.
PY - 1985
Y1 - 1985
N2 - The influence of 1.0 Hz renal nerve stimulation (RNS) on the renal excretion of sodium and bicarbonate was determined in anesthetized dogs before and during inhibition of renal bicarbonate reabsorption. RNS decreased both urinary sodium and bicarbonate excretion without changing arterial pressure, renal blood flow, or glomerular filtration rate. Pharmacological blockade of bicarbonate reabsorption with acetazolamide prevented RNS-induced decreases in bicarbonate excretion and reduced the antinatriuretic response. Physiological blockade of tubular bicarbonate reabsorption with intrarenal sodium bicarbonate infusion (1 M) abolished both the antinatriuretic response to RNS and the decrease in bicarbonate excretion. This physiological blockade of neurogenic antinatriuresis resulted from alkalinization of the urine and/or peritubular blood rather than an increase in filtered sodium load, because during intrarenal infusion of 1 M sodium chloride RNS concomitantly decreased sodium and urinary bicarbonate excretion. Since antinatriuretic responses and the decrease in bicarbonate excretion response to RNS were significantly decreased by blockade of bicarbonate reabsorption (with acetazolamide and intrarenal sodium bicarbonate infusion), antinatriuresis during RNS is partly mediated by a mechanism dependent on intact bicarbonate reabsorption. The data suggest that renal nerve activity may participate in the normal regulation of acid-base balance via changes in bicarbonate excretion.
AB - The influence of 1.0 Hz renal nerve stimulation (RNS) on the renal excretion of sodium and bicarbonate was determined in anesthetized dogs before and during inhibition of renal bicarbonate reabsorption. RNS decreased both urinary sodium and bicarbonate excretion without changing arterial pressure, renal blood flow, or glomerular filtration rate. Pharmacological blockade of bicarbonate reabsorption with acetazolamide prevented RNS-induced decreases in bicarbonate excretion and reduced the antinatriuretic response. Physiological blockade of tubular bicarbonate reabsorption with intrarenal sodium bicarbonate infusion (1 M) abolished both the antinatriuretic response to RNS and the decrease in bicarbonate excretion. This physiological blockade of neurogenic antinatriuresis resulted from alkalinization of the urine and/or peritubular blood rather than an increase in filtered sodium load, because during intrarenal infusion of 1 M sodium chloride RNS concomitantly decreased sodium and urinary bicarbonate excretion. Since antinatriuretic responses and the decrease in bicarbonate excretion response to RNS were significantly decreased by blockade of bicarbonate reabsorption (with acetazolamide and intrarenal sodium bicarbonate infusion), antinatriuresis during RNS is partly mediated by a mechanism dependent on intact bicarbonate reabsorption. The data suggest that renal nerve activity may participate in the normal regulation of acid-base balance via changes in bicarbonate excretion.
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U2 - 10.1152/ajpregu.1985.249.3.r360
DO - 10.1152/ajpregu.1985.249.3.r360
M3 - Article
C2 - 2994498
AN - SCOPUS:0022115280
SN - 0363-6119
VL - 18
SP - R 360-R 367
JO - American Journal of Physiology - Regulatory Integrative and Comparative Physiology
JF - American Journal of Physiology - Regulatory Integrative and Comparative Physiology
IS - 3
ER -