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Am J Physiol Cell Physiol 274: C1075-C1080, 1998;
0363-6143/98 $5.00
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Vol. 274, Issue 4, C1075-C1080, April 1998

Inhibition of proximal tubular fluid absorption by nitric oxide and atrial natriuretic peptide in rat kidney

Eveline Eitle, Siriphun Hiranyachattada, Hui Wang, and Peter J. Harris

Department of Physiology, The University of Melbourne, Parkville, Victoria 3052, Australia

Atrial natriuretic factor (ANF) and nitric oxide (NO) stimulate production of guanosine 3',5'-cyclic monophosphate (cGMP) and are natriuretic. Split-drop micropuncture was performed on anesthetized rats to determine the effects of ANF and the NO donor sodium nitroprusside (SNP) on proximal tubular fluid absorption rate (Jva). Compared with control solutions, SNP (10-4 M) decreased Jva by 23% when administered luminally and by 35% when added to the peritubular perfusate. Stimulation of fluid uptake by luminal angiotensin II (ANG II; 10-9 M) was abolished by SNP (10-4 and 10-6 M). In proximal tubule suspensions, ANF (10-6 M) increased cGMP concentration to 143%, whereas SNP (10-6, 10-5, 10-4, 10-3 M) raised cGMP to 231, 594, 687, and 880%, respectively. S-nitroso-N-acetylpenicillamine (SNAP) also raised cGMP concentrations with similar dose-response relations. These studies demonstrate inhibition by luminal and peritubular NO of basal and ANG II-stimulated proximal fluid absorption in vivo. The ability of SNP to inhibit basal fluid uptake whereas ANF only affected ANG II-stimulated transport may be because of production of higher concentrations of cGMP by SNP.

guanosine 3',5'-cyclic monophosphate; guanylyl cyclase; angiotensin II; sodium nitroprusside; S-nitroso-N-acetylpenicillamine; renal micropuncture


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