<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Siwaporn Praman</style></author><author><style face="normal" font="default" size="100%">Narudol Teerapattarakan</style></author><author><style face="normal" font="default" size="100%">Thaneeya Hawiset</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Garcinia cowa Leaf Ethanolic Extract Induces Vasorelaxation Through eNOS/NO/sGC Pathway, Potassium, and Calcium Channels in Isolated Rat Thoracic Aorta</style></title><secondary-title><style face="normal" font="default" size="100%">Pharmacognosy Journal</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Ca2+ channel.</style></keyword><keyword><style  face="normal" font="default" size="100%">Endothelium</style></keyword><keyword><style  face="normal" font="default" size="100%">Garcinia cowa</style></keyword><keyword><style  face="normal" font="default" size="100%">K+ channel</style></keyword><keyword><style  face="normal" font="default" size="100%">Vasorelaxant effect</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2024</style></year><pub-dates><date><style  face="normal" font="default" size="100%">August 2024</style></date></pub-dates></dates><volume><style face="normal" font="default" size="100%">16</style></volume><pages><style face="normal" font="default" size="100%">797-804</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;&lt;!-- x-tinymce/html --&gt;&lt;/p&gt;

&lt;p class=&quot;rtejustify&quot;&gt;&lt;strong&gt;Background: &lt;/strong&gt;Garcinia cowa Roxb. ex Choisy (G. cowa) is used in traditional medicine, both for improvement of blood circulation and indigestion, also as an antipyretic and expectorant. &lt;strong&gt;Objective:&lt;/strong&gt; This study investigated the vasorelaxant effects and possible mechanisms of action of G. cowa leaf ethanolic extract (GCE) on the rat isolated thoracic aorta. &lt;strong&gt;Methods:&lt;/strong&gt; The study examined the effects of GCE on isolated rat thoracic aorta, including both endothelium-intact and endothelium-denuded aortic rings, using an organ bath system. Specific inhibitors were used to evaluate the mechanism involved in GCE-induced vasorelaxation.&lt;strong&gt; Results:&lt;/strong&gt; GCE (0.01–10 mg/mL) relaxed endothelium-intact aortic rings, that had been precontracted with phenylephrine. Removal of the endothelium or pretreatment of endothelium-intact aortic rings with NꞶ-nitro-L-arginine methyl ester (L-NAME), or 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one (ODQ), significantly decreased vasorelaxation induced by the GCE. Indomethacin or propranolol had no effect on the GCE-induced relaxation of the endothelium-intact aortic rings. In endothelium-denuded aortic rings, the relaxation effect of GCE was significantly blocked by 4-aminopyridine (4-AP) and tetraethylammonium (TEA) at the maximum dose of GCE, but not by glibenclamide. In Ca&lt;sup&gt;2&lt;/sup&gt;+-free Krebs solution, GCE (5 and 10 mg/mL) significantly inhibited extracellular Ca&lt;sup&gt;2&lt;/sup&gt;+ induced contraction in pre-contracted rings with high KCl levels. &lt;strong&gt;Conclusions:&lt;/strong&gt; These findings suggest that GCE exhibits both an endothelium-dependent, which is mediated by an eNOS/NO/sGC pathway, and an endothelium-independent pathway, which involves KCa and KV channels opening and extracellular Ca&lt;sup&gt;2&lt;/sup&gt;+ influx inhibition. Kaempferol, isovitexin, quercetin, apigenin, luteolin, and amentoflavone might play a role in inducing the vasorelaxant effect of GCE.&lt;/p&gt;
</style></abstract><issue><style face="normal" font="default" size="100%">4</style></issue><work-type><style face="normal" font="default" size="100%">Original Article</style></work-type><section><style face="normal" font="default" size="100%">797</style></section><auth-address><style face="normal" font="default" size="100%">&lt;p&gt;&lt;!-- x-tinymce/html --&gt;&lt;/p&gt;

&lt;p class=&quot;rtejustify&quot;&gt;&lt;strong&gt;Siwaporn Praman*, Narudol Teerapattarakan, Thaneeya Hawiset &lt;/strong&gt;&lt;/p&gt;

&lt;p class=&quot;rtejustify&quot;&gt;School of Medicine, Mae&amp;nbsp;Fah Luang University, Chiang Rai 57100, THAILAND.&lt;/p&gt;
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