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T细胞受体对手诱导积极选择.
K A Hogquist1, S C Jameson, W R Heath
1Howard Hughes Medical Institute, Department of Immunology, University of Washington, Seattle 98195.
Cell
|January 14, 1994
概括
阳性T细胞选择对变体具有高度特异性,低效的配体调解了这一关键的免疫过程. 这项研究确定了影响T细胞发育的特定抗体.
科学领域:
- 免疫学 免疫学 免疫学
- T细胞生物学T细胞生物学
- 分子免疫学分子免疫学
背景情况:
- 阳性选择是胸腺T细胞发育中的一个关键过程.
- 它确保T细胞只有在他们的T细胞受体 (TCR) 能够识别自我MHC分子时才成熟.
- 特定联体在调节阳性选择中的作用仍然是积极研究的领域.
研究的目的:
- 研究联体在T细胞的阳性选择中的作用.
- 为了确定可以诱导T细胞受体 (TCR) 转基因模型中积极选择的特定变体.
- 了解正选择的特异性和配体密度灵敏度.
主要方法:
- 来自缺乏β2-微型球蛋白 (β2M(-/-)) 的小鼠的胎儿胸膜叶的器官培养.
- 使用转基因T细胞受体 (TCR) 的小鼠表达一个CD8+特异性的T细胞受体对卵素257-264在Kb.的背景下.
- 分析由各种变体诱导的胸细胞选择,包括TCR抗性.
主要成果:
- 发现了几种变体,被确定为TCR抗性,可以诱导积极选择.
- 选择的胸细胞表现出成熟的CD8+T细胞表型,并对抗原做出反应.
- 一个特定的 (E1) 诱导了β 2M(-/-) 鼠的阳性选择,但β 2M(+/-) 鼠的负性选择,显示出精致的特异性.
结论:
- 阳性选择对联体具有高度特异性,即使对TCR抗剂变体也是如此.
- 该过程对极低的连接体密度敏感.
- 低效率的配体似乎调解了积极选择,突出了T细胞发育中的细微机制.
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