1,25-Dihydroxyvitamin D promotes negative feedback regulation of TLR signaling via targeting microRNA-155-SOCS1 in macrophages.

1,25-Dihydroxyvitamin D promotes negative feedback regulation of TLR signaling via targeting microRNA-155-SOCS1 in macrophages.
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DOI:
10.4049/jimmunol.1203273
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发表时间:
2013-04-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Li YC
Li YC
中科院分区:
其他
文献类型:
--
作者:
Chen Y;Liu W;Sun T;Huang Y;Wang Y;Deb DK;Yoon D;Kong J;Thadhani R;Li YC

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负反馈机制是维持有效免疫和组织动态平衡所必需的。1,25-二羟基维生素D(1,25(OH)2D3)可调节先天免疫反应,但其机制尚不清楚。在此,我们报道了维生素D受体(VDR)信号通过加强负反馈抑制来减轻Toll样受体介导的炎症。当受到脂多糖(LPS)的攻击时,VDR失活会导致小鼠和巨噬细胞培养的高炎症反应,这是因为miR-155的过度生产过度抑制了SOCS1,SOCS1是增强负反馈循环的关键调节因子。MiR-155的缺失减弱了维生素D对内毒素诱导的炎症的抑制,证实了1,25(OH)2D3通过下调miR-155刺激SOCS1。1,25(OH)2D3通过抑制由Bic基因第一内含子内的κB顺式元件介导的NF-κB的激活来下调Bic的转录。综上所述,这些数据确定了维生素D控制先天性免疫的一种新的调节机制。
The negative feedback mechanism is essential to maintain effective immunity and tissue homeostasis. 1,25-dihydroxyvitamin D (1,25(OH)2D3) modulates innate immune response, but the mechanism remains poorly understood. Here we report that vitamin D receptor (VDR) signaling attenuates Toll-like receptor-mediated inflammation by enhancing the negative feedback inhibition. VDR inactivation leads to hyper inflammatory response in mice and macrophage cultures when challenged with lipopolysaccharide (LPS), due to miR-155 overproduction that excessively suppresses SOCS1, a key regulator that enhances the negative feedback loop. Deletion of miR-155 attenuates vitamin D suppression of LPS-induced inflammation, confirming that 1,25(OH)2D3 stimulates SOCS1 by down-regulating miR-155. 1,25(OH)2D3 down-regulates bic transcription by inhibiting NF-κB activation, which is mediated by a κB cis-DNA element located within the first intron of the bic gene. Together these data identify a novel regulatory mechanism for vitamin D to control innate immunity.
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