Mechanism of the nitric oxide-induced blockade of collecting duct water permeability

Hypertension
N H GarcíaJ L Garvin

Abstract

Nitric oxide has a diuretic effect in vivo. We have shown that nitric oxide inhibits antidiuretic hormone-stimulated osmotic water permeability in the collecting duct; however, the mechanism by which this occurs is unknown. We hypothesized that inhibition of antidiuretic hormone-stimulated water permeability by nitric oxide in the collecting duct is the result of activation of cGMP-dependent protein kinase, which in turn decreases intracellular cAMP. To test this hypothesis, we microperfused cortical collecting ducts. Antidiuretic hormone-stimulated water permeability was 317 +/- 47 microm/s (P < .001). Addition of spermine NONOate, a nitric oxide donor, to the bath decreased water permeability to 74 +/- 38 microm/s (P < .002). In the presence of LY 83583, an inhibitor of soluble guanylate cyclase, spermine NONOate did not change water permeability. Addition of spermine NONOate increased cGMP production (P < .01). In the presence of the cGMP-dependent protein kinase inhibitor, spermine NONOate did not change water permeability. Since antidiuretic hormone increases water permeability by increasing cAMP, we hypothesized that nitric oxide inhibits water permeability by decreasing cAMP. In tubules pretreated with antidiuretic hormo...Continue Reading

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