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Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/8041

Title: P2X1 receptors mediate sympathetic postjunctional Ca2+ transients in mesenteric small arteries
Authors: Lamont, Christine
Vial, Catherine
Evans, R.J.
Wier, W.G.
Issue Date: Dec-2006
Publisher: American Physiological Society
Citation: American Journal of Physiology: Heart and Circulatory Physiology, 2006, 291 (6), pp. H3106-H3113.
Abstract: Brief, spatially localized Ca2+ transients occur in the smooth muscle adjacent to perivascular nerves of small arteries during neurogenic contractions. We named these "junctional Ca2+ transients" (jCaTs) and postulated that they arose from Ca2+ entering smooth muscle cells through P2X1 receptors activated by neurally released ATP. Nevertheless, the lack of potent, subtype-selective P2X-receptor antagonists made determining the exact molecular identity of the channels difficult. Here we used small, pressurized mesenteric arteries from P2X1-receptor-deficient mice (KO) to test the hypothesis that jCaTs arise from Ca2+ entering the smooth muscle cell via P2X1 receptors. In wild-type (WT) arteries, confocal microscopy of fluo-4 fluorescence during electrical field stimulation (EFS) of perivascular sympathetic nerves revealed jCaTs in the smooth muscle cells adjacent to the perivascular nerves, similar to those reported previously in rat arteries, and -latrotoxin (2.5 nM) markedly increased the frequency of "spontaneous" jCaTs. In the KO arteries, however, neither EFS nor -latrotoxin elicited any jCaTs. A potent P2X-receptor agonist, ,-methylene ATP (10.0 µM), elicited strong contractions and increased intracellular Ca2+ concentration in WT arteries but elicited neither in KO arteries. A biphasic vasoconstriction in response to EFS was observed in WT arteries. In KO arteries, however, the initial rapid, transient component of the biphasic vasoconstriction was absent. The data support the hypothesis that jCaTs represent Ca2+ that enters the smooth muscle cells through P2X1 receptors activated by neurally released ATP and that this Ca2+ is involved in the initial rapid component of the sympathetic neurogenic contraction.
ISSN: 0002-9513
Links: http://dx.doi.org/10.1152/ajpheart.00466.2006
http://hdl.handle.net/2381/8041
Type: Article
Description: This paper was published as American Journal of Physiology: Heart and Circulatory Physiology, 2006, 291 (6), pp. H3106-H3113. It is available from http://ajpheart.physiology.org/cgi/content/abstract/291/6/H3106. Doi: 10.1152/ajpheart.00466.2006
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Appears in Collections:Published Articles, Dept. of Cell Physiology and Pharmacology

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