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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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