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Interleukin-4 induces up-regulation of endothelial cell claudin-5 through activation of FoxO1: role in protection from complement-mediated injury.

J Biol Chem. 2014 Jan 10;289(2):838-47. Epub 2013 Nov 26
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摘要


Injury to endothelial cells (ECs) often results in cell retraction and gap formation. When caused by antigen aggregation or complement, this injury can be prevented by pretreatment of the ECs with IL-4, suggesting that IL-4 modifies the intercellular junction. Therefore, we investigated the effects of IL-4 on expression of intercellular junction proteins and whether such effects are required for IL-4-induced resistance of ECs against complement-mediated injury. We found that IL-4 induces upregulation of the junction protein claudin-5 in porcine ECs through activation of and phosphorylation and translocation of FoxO1 from the nucleus to the cytoplasm. Increased claudin-5 expression resulted in increased transmembrane electrical resistance of the endothelial monolayer and participated in IL-4-induced protection of the ECs from complement injury. Down-regulation of FoxO1 using siRNA by itself caused up-regulation of claudin-5 expression and partial protection from cytotoxicity. This protection was enhanced by stimulation with IL-4. We previously reported that increased phospholipid synthesis and mitochondrial protection were required for IL-4-induced resistance of ECs against complement injury and now we demonstrate a contribution of claudin-5 expression in IL-4-induced protection.

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