Calcium/calmodulin-dependent protein kinase IV suppresses IL-2 production and regulatory T cell activity in lupus.

Calcium/calmodulin-dependent protein kinase IV suppresses IL-2 production and regulatory T cell activity in lupus.
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DOI:
10.4049/jimmunol.1201785
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发表时间:
2012-10-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Tsokos GC
Tsokos GC
中科院分区:
其他
文献类型:
--
作者:
Koga T;Ichinose K;Mizui M;Crispín JC;Tsokos GC

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在SLE患者的T细胞中,钙/钙调素依赖性蛋白激酶IV (CaMK4)的活性增加,并且已被证明通过促进转录抑制因子cAMP响应元件调节因子(CREM)-α对IL-2启动子的作用来减少IL-2的产生。在这里,我们证明来自MRL/lpr小鼠的T细胞在细胞核中显示出更高水平的CaMK4,并且CaMK4的基因缺失导致生存率提高。我们证明缺乏CaMK4可以恢复IL-2的产生,抑制增加的T细胞激活,并增加调节性T细胞的数量和活性。类似地,SLE患者T细胞中CaMK4的沉默会在TGF-β刺激下增加FoxP3的表达。我们的研究结果证明了丝氨酸/苏氨酸激酶CaMK4在SLE和狼疮易感小鼠中调节性T细胞的产生和功能中的重要性,以及它作为治疗靶点的潜力。
The activity of calcium/calmodulin-dependent protein kinase IV (CaMK4) is increased in T cells from patients with SLE and has been shown to reduce IL-2 production by promoting the effect of the transcriptional repressor cAMP responsive element modulator (CREM)-α on the IL2 promoter. Here we demonstrate that T cells from MRL/lpr mice display increased levels of CaMK4 in the nucleus and that genetic deletion of Camk4 results in improved survival. We demonstrate that absence of CaMK4 restores IL-2 production, curbs increased T cell activation, and augments the number and activity of regulatory T cells. Analogously, silencing of CaMK4 in T cells from patients with SLE increases the expression of FoxP3 upon stimulation in the presence of TGF-β. Our results demonstrate the importance of the serine/threonine kinase CaMK4 in the generation and function of regulatory T cells in patients with SLE and lupus-prone mice and its potential to serve as a therapeutic target.
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