Full metadata record
DC Field | Value | Language |
---|---|---|
dc.contributor.author | 서석효 | - |
dc.date.accessioned | 2016-08-27T02:08:53Z | - |
dc.date.available | 2016-08-27T02:08:53Z | - |
dc.date.issued | 2004 | - |
dc.identifier.issn | 0363-6135 | - |
dc.identifier.other | OAK-1766 | - |
dc.identifier.uri | https://dspace.ewha.ac.kr/handle/2015.oak/215628 | - |
dc.description.abstract | The effects of extracellular K+ on endothelium-dependent relaxation (EDR) and on intracellular Ca2+ concentration ([Ca2+](i)) were examined in mouse aorta, mouse aorta endothelial cells (MAEC), and human umbilical vein endothelial cells (HUVEC). In mouse aortic rings precontracted with prostaglandin F-2alpha or norepinephrine, an increase in extracellular K+ concentration ([K+](o)) from 6 to 12 mM inhibited EDR concentration dependently. In endothelial cells, an increase in [K+](o) inhibited the agonist-induced [Ca2+](i) increase concentration dependently. Similar to K+, Cs+ also inhibited EDR and the increase in [Ca2+](i) concentration dependently. In current-clamped HUVEC, increasing [K+](o) from 6 to 12 mM depolarized membrane potential from -32.8 +/- 2.7 to -8.6 +/- 4.9 mV (n = 8). In voltage-clamped HUVEC, depolarizing the holding potential from -50 to -25 mV decreased [Ca2+](i) significantly from 0.95 +/- 0.03 to 0.88 +/- 0.03 muM (n = 11, P < 0.01) and further decreased [Ca2+](i) to 0.47 &PLUSMN; 0.04 &mu;M by depolarizing the holding potential from -25 to 0 mV (n = 11, P < 0.001). Tetraethylammonium (1 mM) inhibited EDR and the ATP-induced [Ca2+](i) increase in voltage-clamped MAEC. The intermediate-conductance Ca2+-activated K+ channel openers 1-ethyl-2-benzimidazolinone, chlorozoxazone, and zoxazolamine reversed the K+-induced inhibition of EDR and increase in [Ca2+](i). The K+-induced inhibition of EDR and increase in [Ca2+](i) was abolished by the Na+-K+ pump inhibitor ouabain (10 muM). These results indicate that an increase of [K+](o) in the physiological range (6-12 mM) inhibits [Ca2+](i) increase in endothelial cells and diminishes EDR by depolarizing the membrane potential, decreasing K+ efflux, and activating the Na+-K+ pump, thereby modulating the release of endothelium-derived vasoactive factors from endothelial cells and vasomotor tone. | - |
dc.language | English | - |
dc.publisher | AMER PHYSIOLOGICAL SOC | - |
dc.subject | endothelial cell | - |
dc.subject | intracellular calcium | - |
dc.title | Inhibition of endothelium-dependent vasorelaxation by extracellular K+: a novel controlling signal for vascular contractility | - |
dc.type | Article | - |
dc.relation.issue | 1 | - |
dc.relation.volume | 286 | - |
dc.relation.index | SCI | - |
dc.relation.index | SCIE | - |
dc.relation.index | SCOPUS | - |
dc.relation.startpage | H329 | - |
dc.relation.lastpage | H339 | - |
dc.relation.journaltitle | AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY | - |
dc.identifier.doi | 10.1152/ajpheart.00503.2003 | - |
dc.identifier.wosid | WOS:000187350500042 | - |
dc.author.google | Seol, GH | - |
dc.author.google | Ahn, SC | - |
dc.author.google | Kim, JA | - |
dc.author.google | Nilius, B | - |
dc.author.google | Suh, SH | - |
dc.contributor.scopusid | 서석효(55666113100) | - |
dc.date.modifydate | 20230901081001 | - |