Quercetin targets the interaction of calcineurin with LxVP-type motifs in immunosuppression.

Quercetin targets the interaction of calcineurin with LxVP-type motifs in immunosuppression.
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槲皮素在免疫抑制中靶向钙调神经磷酸酶与 LxVP 型基序的相互作用

DOI:
10.1016/j.biochi.2016.04.011
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发表时间:
2016-08
期刊:
影响因子:
3.9
通讯作者:
Luo, Jing
Luo, Jing
中科院分区:
生物学3区
文献类型:
--
作者:
Zhao, Yane;Zhang, Jin;Shi, Xiaoyu;Li, Jing;Wang, Rui;Song, Ruiwen;Wei, Qun;Cai, Huaibin;Luo, Jing

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钙调神经磷酸酶(CN)是一种钙/钙调蛋白(CaM)激活的丝氨酸/苏氨酸磷酸酶。为了执行其不同的生物学功能,CN与许多底物和其他蛋白质进行通信。在T细胞的生理激活中,CN通过属于NFAT家族的转录因子和其他转录效应因子发挥作用。经典免疫抑制药物环孢素A(CsA)可与亲环素(CYP)结合,与CN竞争NFAT LxVP基序。CsA有衰弱的副作用,包括肾毒性、高血压和震颤。开发可替代的免疫抑制剂是可取的。为此,我们首先测试了CN与LxVP类型底物之间的相互作用,包括钙调神经磷酸酶(RCAN1)和NFAT的内源调节因子。有趣的是,我们发现,主要的膳食黄酮醇--槲皮素可以抑制CN的活性,并显著破坏CN与其LxVP-类型底物之间的联系。然后,我们在细胞检测中验证了槲皮素对CN-NFAT相互作用的抑制作用。此外,Quercetin还显示出剂量依赖性地抑制小鼠脾细胞细胞因子基因的表达。这些数据增加了CN与其LxVP类型底物相互作用成为免疫抑制剂潜在靶点的可能性。
Calcineurin (CN) is a unique calcium/calmodulin (CaM)-activated serine/threonine phosphatase. To perform its diverse biological functions, CN communicates with many substrates and other proteins. In the physiological activation of T cells, CN acts through transcriptional factors belonging to the NFAT family and other transcriptional effectors. The classic immunosuppressive drug cyclosporin A (CsA) can bind to cyclophilin (CyP) and compete with CN for the NFAT LxVP motif. CsA has debilitating side effects, including nephrotoxicity, hypertension and tremor. It is desirable to develop alternative immunosuppressive agents. To this end, we first tested the interactions between CN and the LxVP-type substrates, including endogenous regulators of calcineurin (RCAN1) and NFAT. Interestingly, we found that quercetin, the primary dietary flavonol, can inhibit the activity of CN and significantly disrupt the associations between CN and its LxVP-type substrates. We then validated the inhibitory effects of quercetin on the CN-NFAT interactions in cell-based assays. Further, quercetin also shows dose-dependent suppression of cytokine gene expression in mouse spleen cells. These data raise the possibility that the interactions of CN with its LxVP-type substrates are potential targets for immunosuppressive agents.
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发表时间: 1991-08-23
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