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Relaxant effect of levcromakalim in isolated human small subcutaneous arteries.

Authors
Type
Published Article
Journal
European Journal of Pharmacology
0014-2999
Publisher
Elsevier
Publication Date
Volume
287
Issue
3
Pages
313–316
Identifiers
PMID: 8991807
Source
Medline
License
Unknown

Abstract

The effect of levcromakalim, an ATP-sensitive K+ channel opener, on isolated subcutaneous arteries from mammary tissues obtained from female patients undergoing reconstructive breast surgery was investigated. The small arteries were preserved in the University of Wisconsin (UW) solution. The contractile responses to K+ and 9,11-dideoxy-11a,9a-epoxy-methano-prostaglandin F2 alpha (U46619) and the relexant responses to levcromakalim and to the endothelium-dependent vasodilator, methacholine, in these arteries remained fully intact after preservation in UW solution for at least 5 days. The pD2 value and maximal relaxation obtained from the concentration-response curve of levcromakalim (n = 7) were 5.78 +/- 0.23 and 81 +/- 6%, respectively. The vasodilator effect of levcromakalim was significantly antagonised by the ATP-sensitive K+ channel blocker, glibenclamide (1 and 3 microM). In conclusion, isolated human arteries contain ATP-sensitive K+ channels, which can be modulated by K+ channel openers and blockers. Subcutaneous small arteries, as used in our experiments, appear to be very suitable for pharmacological experiments.

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