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Inhibition of Orai1-mediated Ca 2+ entry limits endothelial cell inflammation by suppressing calcineurin-NFATc4 signaling pathway

Orai1-dependent Ca entry plays an essential role in inflammatory response through regulating T cell and macrophage activation and neutrophil infiltration. However, whether Orai1 Ca entry contributes to endothelial activation, one of the early steps of vascular inflammation, remains elusive. In the p...

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Published in:Biochemical and biophysical research communications 2018-01, Vol.495 (2), p.1864
Main Authors: Yu, Bei-Xin, Yuan, Jia-Ni, Zhang, Fei-Ran, Liu, Ying-Ying, Zhang, Ting-Ting, Li, Kai, Lv, Xiao-Fei, Zhou, Jia-Guo, Huang, Lin-Yan, Shang, Jin-Yan, Liang, Si-Jia
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container_title Biochemical and biophysical research communications
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creator Yu, Bei-Xin
Yuan, Jia-Ni
Zhang, Fei-Ran
Liu, Ying-Ying
Zhang, Ting-Ting
Li, Kai
Lv, Xiao-Fei
Zhou, Jia-Guo
Huang, Lin-Yan
Shang, Jin-Yan
Liang, Si-Jia
description Orai1-dependent Ca entry plays an essential role in inflammatory response through regulating T cell and macrophage activation and neutrophil infiltration. However, whether Orai1 Ca entry contributes to endothelial activation, one of the early steps of vascular inflammation, remains elusive. In the present study, we observed that knockdown of Orai1 reduced, whereas overexpression of Orai1 potentiated, TNFα-induced expression of adhesion molecules such as ICAM-1 and VCAM-1 in HUVECs, and subsequently blocked adhesion of monocyte to HUVECs. In vivo, Orai1 downregulation attenuated TNFα-induced ICAM-1 and VCAM-1 expression in mouse aorta and the levels of pro-inflammatory cytokines in the serum. In addition, Orai1 knockdown also dramatically decreased the expression of pro-inflammatory cytokines and neutrophil infiltration in the lung after TNFα treatment, and thus protected lung tissue injury. Notably, among all isoforms of nuclear factor of activated T cells (NFATs), TNFα only triggered NFATc4 nuclear accumulation in HUVECs. Knockdown of Orai1 or inhibition of calcineurin prevented TNFα-induced NFATc4 nuclear translocation and reduced ICAM-1 and VCAM-1 expression in HUVECs. Overexpression of NFATc4 further enhanced ICAM-1 and VCAM-1 expression induced by TNFα. Our study demonstrates that Orai1-Ca -calcineurin-NFATc4 signaling is an essential inflammatory pathway required for TNFα-induced endothelial cell activation and vascular inflammation. Therefore, Orai1 may be a potential therapeutic target for treatment of inflammatory diseases.
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title Inhibition of Orai1-mediated Ca 2+ entry limits endothelial cell inflammation by suppressing calcineurin-NFATc4 signaling pathway
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