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• W3015205903 endingPage "H1295" @default.
• W3015205903 startingPage "H1283" @default.
• W3015205903 abstract "The lymphatic functions in maintaining lymph transport, and immune surveillance can be impaired by infections and inflammation, thereby causing debilitating disorders, such as lymphedema and inflammatory bowel disease. Histamine is a key inflammatory mediator known to trigger vasodilation and vessel hyperpermeability upon binding to its receptors and evoking intracellular Ca2+ ([Ca2+]i) dynamics for downstream signal transductions. However, the exact molecular mechanisms beneath the [Ca2+]i dynamics and the downstream cellular effects have not been elucidated in the lymphatic system. Here, we show that Ca2+ release-activated Ca2+ (CRAC) channels, formed by Orai1 and stromal interaction molecule 1 (STIM1) proteins, are required for the histamine-elicited Ca2+ signaling in human dermal lymphatic endothelial cells (HDLECs). Blockers or antagonists against CRAC channels, phospholipase C, and H1R receptors can all significantly diminish the histamine-evoked [Ca2+]i dynamics in lymphatic endothelial cells (LECs), while short interfering RNA-mediated knockdown of endogenous Orai1 or STIM1 also abolished the Ca2+ entry upon histamine stimulation in LECs. Furthermore, we find that histamine compromises the lymphatic endothelial barrier function by increasing the intercellular permeability and disrupting vascular endothelial-cadherin integrity, which is remarkably attenuated by CRAC channel blockers. Additionally, the upregulated expression of inflammatory cytokines, IL-6 and IL-8, after histamine stimulation was abolished by silencing Orai1 or STIM1 with RNAi in LECs. Taken together, our data demonstrated the essential role of CRAC channels in mediating the [Ca2+]i signaling and downstream endothelial barrier and inflammatory functions induced by histamine in the LECs, suggesting a promising potential to relieve histamine-triggered vascular leakage and inflammatory disorders in the lymphatics by targeting CRAC channel functions." @default.
• W3015205903 created "2020-04-17" @default.
• W3015205903 creator A5000327598 @default.
• W3015205903 creator A5030903200 @default.
• W3015205903 creator A5032764121 @default.
• W3015205903 creator A5066331451 @default.
• W3015205903 creator A5070448855 @default.
• W3015205903 creator A5073579725 @default.
• W3015205903 date "2020-05-01" @default.
• W3015205903 modified "2023-10-02" @default.
• W3015205903 title "Ca²⁺release-activated Ca²⁺channels are responsible for histamine-induced Ca²⁺entry, permeability increase, and interleukin synthesis in lymphatic endothelial cells" @default.
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