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• W3135855299 abstract "Purposes : Since the role of store-operated calcium entry (SOCE) in endothelium-dependent hyperpolarization (EDH)-mediated vasorelaxation of mesenteric arteries in health and colitis is not fully understood, cyclopiazonic acid (CPA), a specific inhibitor of the sarco(endo) plasmic reticulum calcium-ATPases (SERCA), was used as a SOCE activator to investigate its role in normal mice and its alteration in colitis mice. Methods : The changes in Ca 2+ signaling in vascular endothelial cells (VEC) were examined by single cell Ca 2+ imaging and tension of mesenteric arteries in response to CPA were examined using Danish DMT520A microvascular measuring system. Results : CPA activated the SOCE through depletion of the endoplasmic reticulum (ER) Ca 2+ in endothelial cells. CPA had a concentration-dependent vasorelaxing effect in endothelium-intact mesenteric arteries, which was lost after endothelial removal. Both nitric oxide (NO) and prostacyclin (PGI 2 ) inhibitors did not affect CPA-induced vasorelaxation; however, after both NO and PGI 2 were inhibited, K Ca channel blocker [10 mM tetraethylammonium chloride (TEA)] inhibited CPA-induced vasorelaxation while K Ca channel activator (0.3 μM SKA-31) promoted it. Two SOCE blockers [30 μM SKF96365 and 100 μM flufenamic acid (FFA)], and an Orai channel blocker (30 μM GSK-7975A) inhibited this vasorelaxation. The inhibition of both Na + /K + -ATPase (NKA) and Na + /Ca 2+ -exchange (NCX) also inhibited CPA-induced vasorelaxation. Finally, the CPA involved in EDH-induced vasorelaxation by the depletion of ER Ca 2+ of mesenteric arteries was impaired in colitis mice. Conclusion : Depletion of ER Ca 2+ by CPA induces a vasorelaxation of mesenteric arteries that is mediated through EDH mechanism and invokes the activation of SOCE. The CPA-induced endothelium-dependent dilation is impaired in colitis which may limit blood perfusion to the intestinal mucosa." @default.
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• W3135855299 date "2021-03-09" @default.
• W3135855299 modified "2023-09-29" @default.
• W3135855299 title "Cyclopiazonic Acid-Induced Ca2+ Store Depletion Initiates Endothelium-Dependent Hyperpolarization-Mediated Vasorelaxation of Mesenteric Arteries in Healthy and Colitis Mice" @default.
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• W3135855299 doi "https://doi.org/10.3389/fphys.2021.639857" @default.
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