1,25-Dihyroxyvitamin D3 promotes FOXP3 expression via binding to vitamin D response elements in its conserved noncoding sequence region.

1,25-Dihyroxyvitamin D3 promotes FOXP3 expression via binding to vitamin D response elements in its conserved noncoding sequence region.
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DOI:
10.4049/jimmunol.1101211
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发表时间:
2012-06-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Kang I
Kang I
中科院分区:
其他
文献类型:
--
作者:
Kang SW;Kim SH;Lee N;Lee WW;Hwang KA;Shin MS;Lee SH;Kim WU;Kang I

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叉头盒P3(FOXP 3)阳性调节性T细胞(Treg)是具有免疫调节特性的T细胞的独特亚群。Treg细胞可以通过T细胞受体(TCR)触发、IL-2和TGF-β或视黄酸从非Treg CD 4 + T细胞(诱导的Treg,iTreg)诱导。1,25(OH)2维生素D3(VD 3)影响包括T细胞在内的免疫细胞的功能。1,25(OH)2 VD 3结合核维生素D受体(VDR),该受体结合被称为维生素D反应元件(VDRE)的靶DNA序列。虽然1,25(OH)2 VD 3可以促进TCR触发和IL-2的CD 4 + T细胞中FOXP 3的表达,但尚不清楚1,25(OH)2 VD 3的这种作用是否通过VDR与FOXP 3基因的直接结合而介导,而不涉及其他分子。此外,尚不清楚FOXP 3在1,25(OH)2 VD 3诱导的Treg(VD-iTreg)细胞中的表达是否对这些细胞的抑制功能至关重要。在这里,我们证明了VDRE在人FOXP 3基因的内含子保守非编码序列(CNS)区+1714至+2554中的存在,以及这种VDRE响应于1,25(OH)2 VD 3而增强FOXP 3启动子活性。此外,VD-iTreg细胞抑制靶CD 4 + T细胞的增殖,并且这种活性依赖于FOXP 3表达。这些发现表明,1,25(OH)2 VD 3可以通过直接VDR结合到FOXP 3基因来调节CD 4 + T细胞中的FOXP 3表达,从而影响人类免疫应答,所述FOXP 3基因对于VD-iTreg细胞的抑制功能是必需的。
Forkhead box P3 (FOXP3)-positive regulatory T cells (Treg) are a unique subset of T cells with immune regulatory properties. Treg cells can be induced from non-Treg CD4+ T cells (induced Treg, iTreg) by T cell receptor (TCR) triggering, IL-2 and TGF-β or retinoic acid. 1,25(OH)2 vitamin D3 (VD3) affects the functions of immune cells including T cells. 1,25(OH)2VD3 binds the nuclear vitamin D receptor (VDR) that binds target DNA sequences known as the vitamin D response element (VDRE). Although 1,25(OH)2VD3 can promote FOXP3 expression in CD4+ T cells with TCR triggering and IL-2, it is unknown whether this effect of 1,25(OH)2VD3 is mediated through direct binding of VDR to the FOXP3 gene without involving other molecules. Also, it is unclear whether FOXP3 expression in 1,25(OH)2VD3-induced Treg (VD-iTreg) cells is critical for the inhibitory function of these cells. Here we demonstrated the presence of VDREs in the intronic conserved non-coding sequence (CNS) region +1714 to +2554 of the human FOXP3 gene and the enhancement of the FOXP3 promoter activity by such VDREs in response to 1,25(OH)2VD3. In addition, VD-iTreg cells suppressed the proliferation of target CD4+ T cells and this activity was dependent on FOXP3 expression. These findings suggest that 1,25(OH)2VD3 can affect human immune responses by regulating FOXP3 expression in CD4+ T cells through direct VDR binding to the FOXP3 gene which is essential for inhibitory function of VD-iTreg cells.
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1,25-二羟基维生素D3和IL-2结合抑制炎性细胞因子的T细胞产生,并促进表达CTLA-4和FOXP3的调节性T细胞的发育。
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发表时间: 2009-11-01
期刊: Journal of immunology (Baltimore, Md. : 1950)
影响因子: --
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