Stat4 isoforms differentially regulate inflammation and demyelination in experimental allergic encephalomyelitis.

Stat4 isoforms differentially regulate inflammation and demyelination in experimental allergic encephalomyelitis.
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DOI:
10.4049/jimmunol.181.8.5681
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发表时间:
2008-10-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Bright JJ
Bright JJ
中科院分区:
其他
文献类型:
--
作者:
Mo C;Chearwae W;O'Malley JT;Adams SM;Kanakasabai S;Walline CC;Stritesky GL;Good SR;Perumal NB;Kaplan MH;Bright JJ

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实验性过敏性脑脊髓炎 (EAE) 是一种 T 细胞介导的多发性硬化症 (MS) 自身免疫性疾病模型。信号转导器和转录激活剂 4 (Stat4) 是一种由白细胞介素 12 (IL-12) 和 IL-23 激活的转录因子,这两种细胞因子已知通过诱导 T 细胞分别分泌 IFN-_ 和 IL-17 在 EAE 的发病机制中发挥重要作用。我们和其他人之前已经证明,治疗干预或有针对性地破坏 Stat4 可有效改善 EAE。最近,Stat4 的剪接变体 Stat4β 被鉴定为在全长 Stat4α 的 C 末端缺少 44 个氨基酸。在这项研究中,我们检查了表达任一亚型的 T 细胞是否会影响 EAE 的发病机制。我们发现,在 Stat4 缺陷背景下表达 Stat4β 的转基因小鼠在用 MOGp35-55 肽免疫后,与野生型小鼠相比,出现了加重的 EAE,而 Stat4α 转基因小鼠则大大减轻了疾病。转基因小鼠中 EAE 的差异发展与 Stat4β 表达细胞中 IFNγ 和 IL-17 的原位增加相关,而 Stat4α 表达细胞中 IL-10 产量的增加则相反。这项研究表明,Stat4 异构体差异性地调节炎症细胞因子,与 EAE 的发作和严重程度的不同影响相关。
Experimental allergic encephalomyelitis (EAE) is a T cell-mediated autoimmune disease model of multiple sclerosis (MS). Signal transducer and activator of transcription 4 (Stat4) is a transcription factor activated by interleukin 12 (IL-12) and IL-23, two cytokines known to play important roles in the pathogenesis of EAE by inducing T cells to secrete IFN-_ and IL-17 respectively. We and others have shown earlier that therapeutic intervention or targeted disruption of Stat4 was effective in ameliorating EAE. Recently, a splice variant of Stat4 termed Stat4β has been characterized that lacks 44 amino acids at the C-terminus of the full length Stat4α. In this study we examined whether T cells expressing either isoform could impact the pathogenesis of EAE. We found that transgenic mice expressing Stat4βon a Stat4-deficient background develop an exacerbated EAE compared to wild-type mice following immunization with MOGp35–55 peptide, while Stat4α transgenic mice have greatly attenuated disease. The differential development of EAE in transgenic mice correlates with increased IFNγ and IL-17 in Stat4β-expressing cells in situ, contrasting increased IL-10 production by Stat4α-expressing cells. This study demonstrates that Stat4 isoforms differentially regulate inflammatory cytokines in association with distinct effects on the onset and severity of EAE.
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