由于HLA-B27的表达改变了TGFβ信号通路,导致与脊椎关节炎相关的致病后果
Marc Lauraine1,2, Maxence de Taffin de Tilques3, Dganit Melamed-Kadosh4
1Infection & Inflammation, UMR 1173, Inserm, UVSQ, Université Paris Saclay, 2 avenue de la Source de la Bièvre, Montigny-le-Bretonneux, 78180, France.
Arthritis research & therapy
|July 15, 2024
概括
人类白细胞抗原B27 (HLA-B27) 蛋白质破坏了Drosophila和老鼠的转化生长因子β (TGFβ) 信号通路. 这种干扰可能通过影响T细胞分化来解释其与脊椎关节炎 (SpA) 的关联.
科学领域:
- 免疫遗传学 免疫遗传学
- 分子生物学分子生物学
- 发展生物学 发展生物学
背景情况:
- HLA-B27与脊椎关节炎 (SpA) 之间的关联已经确立,但在机理上尚不清楚.
- 之前的研究表明,HLA-B27与Drosophila中的BMPR1 Saxophone (Sax) 相互作用,破坏骨形态遗传蛋白 (BMP) 途径并导致无交叉静脉的表型.
研究的目的:
- 为了研究激素/转化生长因子β (TGFβ) 途径与转基因Drosophila中的HLA-B27之间的遗传相互作用.
- 为了描述Drosophila翅膀形象性盘中的HLA-B27结合体.
- 评估HLA-B27与BMP受体的物理相互作用以及对来自HLA-B27/hβ2m大鼠T细胞中TGFβ通路信号传递的后续影响.
主要方法:
- 转基因Drosophila翅膀中的遗传相互作用研究.
- 在Drosophila翅膀影像盘中的HLA-B27结合的体特征.
- 评估HLA-B27和BMP受体 (ALK2,ALK3,ALK5) 在老鼠间膜淋巴结T细胞之间的物理相互作用.
- 评估小鼠T细胞中TGFβ通路中的SMAD酸化和基因表达.
主要成果:
- 在Drosophila中,HLA-B27通过activin/TGFβ受体Baboon (Babo) 发出信号,与BMP通路中断一起,有助于交叉无静脉表型.
- 在大鼠T细胞中,证实了HLA-B27与萨克斯和巴博 (ALK2和ALK5) 的哺乳动物正义细胞 (ALK2和ALK5) 之间的物理相互作用.
- 在B27大鼠的T细胞中观察到SMAD2/3酸化的增加和TGFβ基因 (例如,Foxp3,Rorc) 的改变表达,这表明TGFβ通路失调.
- 从B27大鼠的天真T细胞中减少Tgfb1的表达表明一种促炎状态.
结论:
- 在Drosophila和大鼠中,HLA-B27显著改变了TGFβ通路的活动.
- HLA-B27对TGFβ通路的调节失调可能导致B27大鼠观察到的促炎性T辅助细胞17和改变调节性T细胞表型的异常扩张,这可能解释其与SPA的联系.
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