Characterization of the endothelium-derived hyperpolarizing factor (EDHF) response in the human interlobar artery.

Abstract:

BACKGROUND:In addition to nitric oxide (NO) and prostacyclin (PGI2), the vascular endothelium can influence local vascular tone by a mechanism involving the hyperpolarization of vascular smooth muscle cells. This response is attributed to the release of an endothelium-derived hyperpolarizing factor (EDHF). The present study was performed to determine the characteristics of the EDHF that mediates the NO/PGI2-independent hyperpolarization and relaxation of human renal interlobar arteries. METHODS:Acetylcholine-induced, EDHF-mediated hyperpolarization and relaxation were assessed using sharp microelectrodes impaled into interlobar smooth muscle cells and in organ chamber experiments, respectively. All experiments were performed in the combined presence of NO synthase (NOS) and cyclooxygenase inhibitors and the thromboxane analog U46619. RESULTS:Interlobar arteries demonstrated pronounced NO/PGI2-independent relaxations and hyperpolarizations that were sensitive to the blockade of calcium-activated K+-channels (KCa+ channels) by the combination of charybdotoxin and apamin and to the inhibition of the Na-K-ATPase by ouabain. Exogenously applied KCl also exhibited relaxations and hyperpolarizations that were sensitive to ouabain but insensitive to the combined inclusion of charybdotoxin and apamin. Relaxations induced by KCl were also observed in endothelium-denuded interlobar arteries. CONCLUSION:These results indicate that in the human renal interlobar artery, EDHF-mediated responses display the pharmacologic characteristics of K+ ions released through endothelial KCa+ channels. Smooth muscle cell hyperpolarization and relaxation appear to be dependent on the activation of ouabain-sensitive subunits of the Na-K-ATPase.

journal_name

Kidney Int

journal_title

Kidney international

authors

Büssemaker E,Popp R,Binder J,Busse R,Fleming I

doi

10.1046/j.1523-1755.2003.00910.x

subject

Has Abstract

pub_date

2003-05-01 00:00:00

pages

1749-55

issue

5

eissn

0085-2538

issn

1523-1755

pii

S0085-2538(15)49064-7

journal_volume

63

pub_type

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