人工抗原呈现细胞系统揭示了CD28在人类免疫缺陷病毒感染期间调节T细胞功能的作用
Tayma Shaaban Kabakibo1,2,3, Edwige Arnold1,2, Kartika Padhan1
1Research Centre of the Centre Hospitalier de l'Université de Montréal (CRCHUM), Montréal, QC, Canada.
iScience
|October 9, 2024
概括
人工抗原呈现细胞揭示了HIV的T细胞功能障碍. 在艾滋病毒患者中,CD28协同刺激发生变化,影响细胞因子概况和T细胞反应,治疗后部分恢复.
科学领域:
- 免疫学 免疫学 免疫学
- 病毒学 病毒学
- 生物技术是生物技术.
背景情况:
- 慢性艾滋病毒感染的特征是T细胞免疫功能障碍.
- 评估非特异性T细胞功能障碍需要通用激活和T细胞受体 (TCR) 刺激方法.
研究的目的:
- 开发和使用可调节的人工抗原呈现细胞 (aAPC) 系统来研究HIVT细胞功能障碍.
- 评估CD28联合刺激对HIV感染个体T细胞反应的影响.
主要方法:
- 在二氧化微珠上使用脂质双层创建了一个可调节的aAPC系统.
- 用抗CD3和抗CD28激素激发的T细胞来评估激活和细胞因子概况.
- 分析了艾滋病毒感染个体的T细胞效应因子功能 (IL-2,TNFα,IFNγ,CD107a) 和CD28依赖性.
主要成果:
- 同时刺激CD28显著增强T细胞激活和细胞因子表达,特别是IL-2.
- 来自未经治疗的HIV感染个体的T细胞显示出改变的效应因子功能,倾向于TNFα,IFNγ和CD107a, IL-2减少.
- 在HIV感染的T细胞中观察到CD28的依赖性降低.
- 抗逆转录病毒疗法在CD4+ T细胞中部分恢复了T细胞概况,但在CD8+ T细胞中没有.
结论:
- 该aAPC系统有效地探测HIV的T细胞功能障碍.
- 艾滋病毒感染诱导了内在的T细胞偏差,改变了效应器功能和CD28协同刺激反应.
- 艾滋病毒中持续的T细胞功能障碍可能与这些内在偏差有关,即使在治疗后.
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