在接种疫苗后,人类记忆CD8T细胞的起源和分化
Rama S Akondy1,2, Mark Fitch3, Srilatha Edupuganti4
1Emory Vaccine Center, Emory University School of Medicine, Atlanta, Georgia, USA.
Nature
|December 14, 2017
概括
使用黄热病病毒 (YFV) 疫苗研究了人类记忆CD8 T细胞分化. 长寿记忆细胞起源于快速分裂的细胞,并保持对效应器功能的表观遗传记忆.
科学领域:
- 免疫学 免疫学 免疫学
- 细胞生物学 细胞生物学
- 疫苗学 疫苗学 疫苗学
背景情况:
- 人类记忆CD8T细胞的分化途径仍然不完全理解.
- 病毒感染后的长期免疫对于保护性免疫反应至关重要.
研究的目的:
- 阐明人类记忆CD8T细胞的分化和维护机制.
- 研究黄热病病毒 (YFV) 疫苗诱导的记忆CD8T细胞的细胞动态和表观遗传特征.
主要方法:
- 在体内使用乳标签来追踪YFV疫苗接种后 CD8 T 细胞的增殖.
- 量化稀释动力学在YFV特定的CD8T细胞中通过质谱测量来评估细胞循环和寿命.
- 分析了记忆CD8T细胞的表观遗传景观,使用评估染色质可访问性的技术.
主要成果:
- 确定记忆CD8T细胞池是由YFV感染后的最初两周内广泛分裂的细胞产生的.
- 证明记忆CD8T细胞由静止细胞维持,其分裂速度非常缓慢 (翻倍时间>450天).
- 揭示了长寿记忆CD8 T细胞表现出类似于效应细胞的表观遗传特征,在效应基因上具有开放色素,至少持续十年.
结论:
- 人类记忆CD8 T细胞群是由早期的,快速的增殖建立的,并由长寿的,静止的细胞维持.
- 记忆 CD8 T 细胞保留了其效应器阶段的稳定表观遗传特征,表明了快速回忆反应的平衡状态.
- 这些发现为人类记忆CD8 T细胞的长期维护和功能潜力提供了关键的见解.
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