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Am J Physiol Renal Physiol 282: F1043-F1048, 2002. First published December 18, 2001; doi:10.1152/ajprenal.00279.2001
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Vol. 282, Issue 6, F1043-F1048, June 2002

Renal nerve stimulation augments effect of intraluminal angiotensin II on proximal tubule transport

Albert Quan1 and Michel Baum1,2

Departments of 1 Pediatrics and 2 Internal Medicine, University of Texas Southwestern Medical Center, Dallas, Texas 75390-9063

The proximal tubule synthesizes and secretes angiotensin II into the lumen, where it regulates transport. Renal denervation abolishes the effect of angiotensin II on proximal tubule transport. Using in vivo microperfusion, we examined whether renal nerve stimulation modulates the effect of angiotensin II on transport. The effect of angiotensin II was assessed by measuring the decrease in volume reabsorption with the addition of 10-4 M luminal enalaprilat. Luminal enalaprilat did not alter volume reabsorption (2.80 ± 0.18 vs. 2.34 ± 0.14 nl · mm-1 · min-1). However, with renal nerve stimulation, enalaprilat decreased volume reabsorption (3.45 ± 0.22 vs. 1.67 ± 0.20 nl · mm-1 · min-1, P < 0.0005). The absolute and percent decrements in volume reabsorption with luminal enalaprilat were higher with renal nerve stimulation than with native innervation (1.78 ± 0.19 vs. 0.46 ± 0.23 nl · mm-1 · min-1, P < 0.02, and 51.8 ± 5.0 vs. 14.6 ± 7.4%, P < 0.05, respectively). Renal nerve stimulation did not alter the glomerular filtration rate or renal blood flow. Renal nerve stimulation augments the stimulatory effect of intraluminal angiotensin II. The sympathetic renal nerves modulate the proximal tubule renin-angiotensin system and thereby regulate proximal tubule transport.

renin-angiotensin system; enalaprilat; in vivo microperfusion


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