激活PI3Kδ 特别扰乱小鼠调节T细胞平衡和功能,导致免疫失调
Akhilesh K Singh1, Fahd Al Qureshah1,2,3, Travis Drow1
1Center for Immunity and Immunotherapies, Seattle Children's Research Institute, Seattle, WA.
Journal of immunology (Baltimore, Md. : 1950)
|June 3, 2024
概括
在调节性T细胞 (Treg) 中失调的PI3Kδ信号破坏了免疫耐受性,导致炎症和自身免疫. 最佳的PI3Kδ活性对于Treg功能和恒常性至关重要,提供治疗点.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 分子生物学分子生物学
背景情况:
- 调节FOXP3+的T细胞 (Treg) 对于免疫耐受性和预防自身免疫性至关重要.
- PI3Kδ信号传递对Treg发育和功能至关重要.
- 失调的PI3Kδ信号对Treg功能的确切影响需要进一步研究.
研究的目的:
- 用条件小鼠模型研究特异性Treg区内改变PI3Kδ信号传递的作用.
- 阐明PI3Kδ功能增益突变对Treg发育,表型和功能的影响.
主要方法:
- 使用条件小鼠模型具有PIK3CD功能增益突变 (aPIK3CD),特别是在Treg区.
- 分析了免疫细胞种群,细胞因子分泌 (IFN-γ),生殖中心反应,自身抗体产生以及Treg数量和表型 (PD-1表达).
- 评估了T细胞依赖抗原免疫接种后的幽默免疫反应.
主要成果:
- 特定于Treg的aPIK3CD小鼠表现出体重减轻和慢性炎症的迹象,包括T细胞和自身抗体的增加.
- PI3Kδ激活增强了Treg前体的发育和外围Treg数量,但导致了变化的Treg表型,增加了PD-1表达和降低了竞争力.
- 这些小鼠在免疫接种后表现出较高的幽默反应,与卵泡Treg.的减少有关.
结论:
- 保持PI3Kδ活动的最佳值对于维持Treg稳态和功能至关重要.
- 在Tregs中失调的PI3Kδ信号传递可能导致免疫失调,其特征是炎症和自身免疫.
- 在Tregs中的PI3Kδ信号传递为调节免疫反应提供了潜在的治疗点.
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