{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T05:16:58Z","timestamp":1791868618693,"version":"4.3.4"},"reference-count":63,"publisher":"Wiley","issue":"12","license":[{"start":{"date-parts":[[2016,3,4]],"date-time":"2016-03-04T00:00:00Z","timestamp":1457049600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"},{"start":{"date-parts":[[2016,3,4]],"date-time":"2016-03-04T00:00:00Z","timestamp":1457049600000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["The Journal of Physiology"],"published-print":{"date-parts":[[2016,6,15]]},"abstract":"<jats:sec>\n                    <jats:title>Key points<\/jats:title>\n                    <jats:p>\n                      <jats:list list-type=\"bullet\">\n                        <jats:list-item>\n                          <jats:p>Increase in endothelial cell (EC) calcium activates calcium\u2010sensitive intermediate and small conductance potassium (IK and SK) channels, thereby causing hyperpolarization and endothelium\u2010dependent vasodilatation.<\/jats:p>\n                        <\/jats:list-item>\n                        <jats:list-item>\n                          <jats:p>Endothelial cells express inward rectifier potassium (Kir) channels, but their role in endothelium\u2010dependent vasodilatation is not clear.<\/jats:p>\n                        <\/jats:list-item>\n                        <jats:list-item>\n                          <jats:p>In the mesenteric arteries, only ECs, but not smooth muscle cells, displayed Kir currents that were predominantly mediated by the Kir2.1 isoform.<\/jats:p>\n                        <\/jats:list-item>\n                        <jats:list-item>\n                          <jats:p>Endothelium\u2010dependent vasodilatations in response to muscarinic receptor, TRPV4 (transient receptor potential vanilloid 4) channel and IK\/SK channel agonists were highly attenuated by Kir channel inhibitors and by Kir2.1 channel knockdown.<\/jats:p>\n                        <\/jats:list-item>\n                        <jats:list-item>\n                          <jats:p>These results point to EC Kir channels as amplifiers of vasodilatation in response to increases in EC calcium and IK\/SK channel activation and suggest that EC Kir channels could be targeted to treat endothelial dysfunction, which is a hallmark of vascular disorders.<\/jats:p>\n                        <\/jats:list-item>\n                      <\/jats:list>\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Abstract<\/jats:title>\n                    <jats:p>\n                      Endothelium\u2010dependent vasodilators, such as acetylcholine, increase intracellular Ca\n                      <jats:sup>2+<\/jats:sup>\n                      through activation of transient receptor potential vanilloid 4 (TRPV4) channels in the plasma membrane and inositol trisphosphate receptors in the endoplasmic reticulum, leading to stimulation of Ca\n                      <jats:sup>2+<\/jats:sup>\n                      \u2010sensitive intermediate and small conductance K\n                      <jats:sup>+<\/jats:sup>\n                      (IK and SK, respectively) channels. Although strong inward rectifier K\n                      <jats:sup>+<\/jats:sup>\n                      (Kir) channels have been reported in the native endothelial cells (ECs) their role in EC\u2010dependent vasodilatation is not clear. Here, we test the idea that Kir channels boost the EC\u2010dependent vasodilatation of resistance\u2010sized arteries. We show that ECs, but not smooth muscle cells, of small mesenteric arteries have Kir currents, which are substantially reduced in EC\u2010specific Kir2.1 knockdown (EC\u2010\n                      <jats:italic>Kir2.1<\/jats:italic>\n                      <jats:sup>\u2212\/\u2212<\/jats:sup>\n                      ) mice. Elevation of extracellular K\n                      <jats:sup>+<\/jats:sup>\n                      to 14\u00a0m\n                      <jats:sc>m<\/jats:sc>\n                      caused vasodilatation of pressurized arteries, which was prevented by endothelial denudation and Kir channel inhibitors (Ba\n                      <jats:sup>2+<\/jats:sup>\n                      , ML\u2010133) or in the arteries from EC\u2010\n                      <jats:italic>Kir2.1<\/jats:italic>\n                      <jats:sup>\u2212\/\u2212<\/jats:sup>\n                      mice. Potassium\u2010induced dilatations were unaffected by inhibitors of TRPV4, IK and SK channels. The Kir channel blocker, Ba\n                      <jats:sup>2+<\/jats:sup>\n                      , did not affect currents through TRPV4, IK or SK channels. Endothelial cell\u2010dependent vasodilatations in response to activation of muscarinic receptors, TRPV4 channels or IK\/SK channels were reduced, but not eliminated, by Kir channel inhibitors or EC\u2010\n                      <jats:italic>Kir2.1<\/jats:italic>\n                      <jats:sup>\u2212\/\u2212<\/jats:sup>\n                      . In angiotensin\u00a0II\u2010induced hypertension, the Kir channel function was not altered, although the endothelium\u2010dependent vasodilatation was severely impaired. Our results support the concept that EC Kir2 channels boost vasodilatory signals that are generated by Ca\n                      <jats:sup>2+<\/jats:sup>\n                      \u2010dependent activation of IK and SK channels.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1113\/jp271652","type":"journal-article","created":{"date-parts":[[2016,2,3]],"date-time":"2016-02-03T12:06:22Z","timestamp":1454501182000},"page":"3271-3285","source":"Crossref","is-referenced-by-count":124,"title":["Inward rectifier potassium (Kir2.1) channels as end\u2010stage boosters of endothelium\u2010dependent vasodilators"],"prefix":"10.1113","volume":"594","author":[{"given":"Swapnil K.","family":"Sonkusare","sequence":"first","affiliation":[{"name":"Department of Pharmacology University of Vermont  VT USA"},{"name":"Department of Molecular Physiology and Biological Physics University of Virginia  VA USA"},{"name":"Robert M. 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