Selective miRNA disruption in T reg cells leads to uncontrolled autoimmunity.

Selective miRNA disruption in T reg cells leads to uncontrolled autoimmunity.
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DOI:
10.1084/jem.20080707
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发表时间:
2008-09-01
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Bluestone JA
Bluestone JA
中科院分区:
其他
文献类型:
--
作者:
Zhou X;Jeker LT;Fife BT;Zhu S;Anderson MS;McManus MT;Bluestone JA

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将一种新的调节性T(T reg)细胞特异性FoxP 3-GFP-hCre细菌人工染色体转基因小鼠与条件性Dicer敲除(KO)小鼠品系杂交,以分析microRNA(miRNA)在T reg细胞发育和功能中的作用。虽然胸腺T reg细胞在这种情况下正常发育,但细胞显示出外周分化和功能障碍改变的证据。Dicer缺陷的T reg谱系细胞未能保持稳定,因为一部分细胞下调了T reg细胞特异性转录因子FoxP 3,而大多数细胞表达与T reg细胞指纹相关的多种基因和蛋白质(包括Neuropilin 1,糖皮质激素诱导的肿瘤坏死因子受体和细胞毒性T淋巴细胞抗原4)的水平改变。事实上,相当大比例的T reg谱系细胞呈现T辅助细胞记忆表型,包括CD 127、白细胞介素4和干扰素γ水平升高。重要的是,Dicer缺陷型T reg细胞在体内失去了抑制活性;小鼠迅速发展出类似FoxP 3 KO表型的致命性全身性自身免疫疾病。这些结果支持miRNA在维持体内分化的T reg细胞功能的稳定性和适应性免疫系统的稳态中的核心作用。
A new regulatory T (T reg) cell–specific, FoxP3-GFP-hCre bacterial artificial chromosome transgenic mouse was crossed to a conditional Dicer knockout (KO) mouse strain to analyze the role of microRNAs (miRNAs) in the development and function of T reg cells. Although thymic T reg cells developed normally in this setting, the cells showed evidence of altered differentiation and dysfunction in the periphery. Dicer-deficient T reg lineage cells failed to remain stable, as a subset of cells down-regulated the T reg cell–specific transcription factor FoxP3, whereas the majority expressed altered levels of multiple genes and proteins (including Neuropilin 1, glucocorticoid-induced tumor necrosis factor receptor, and cytotoxic T lymphocyte antigen 4) associated with the T reg cell fingerprint. In fact, a significant percentage of the T reg lineage cells took on a T helper cell memory phenotype including increased levels of CD127, interleukin 4, and interferon γ. Importantly, Dicer-deficient T reg cells lost suppression activity in vivo; the mice rapidly developed fatal systemic autoimmune disease resembling the FoxP3 KO phenotype. These results support a central role for miRNAs in maintaining the stability of differentiated T reg cell function in vivo and homeostasis of the adaptive immune system.
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