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由单个MHC/联体形成的T细胞的谱
L Ignatowicz1, J Kappler, P Marrack
1Department of Medicine, National Jewish Center for Immunology and Respiratory Medicine, University of Colorado Health Sciences Center, Denver, 80206, USA.
少数不成熟的胸腺细胞在胸腺中成熟. 积极选择被认为是限制发育的,实际上允许许多细胞成熟,但这些细胞后来由于与自我的交叉反应而死亡,限制了T细胞谱.
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
- 胸细胞的发育过程
背景情况:
- 甲状腺对于T细胞成熟至关重要,但大多数甲状腺细胞无法生存.
- 积极选择是关键的发育检查点,传统上被视为瓶.
- 精确的机制限制胸细胞成熟仍然不完全理解.
研究的目的:
- 为了研究超出初始阳性选择,限制小细胞成熟的因素.
- 了解MHC/相互作用在塑造T细胞谱的作用.
- 探索单个MHC/选择对胸细胞存活率和T细胞反应性的影响.
主要方法:
- 对基因改造小鼠模型中表达单个MHC/联体的胸细胞发育的分析.
- 评估乳腺细胞存活率和T细胞受体 (TCR) 谱.
- 在体外测试测量T细胞对各种MHC/复合物的反应性.
主要成果:
- 带有单个MHC/配体的甲状腺细胞选择了惊人的大量甲状腺细胞.
- 许多精选的胸细胞表现出与选择性MHC结合不同自我的交叉反应性.
- 这些交叉反应细胞由于过度的自我反应性而死亡,限制了最终成熟的T细胞池.
- 来自这些甲状腺的成熟T细胞经常与外来MHC分子发生反应.
结论:
- 胸细胞成熟不仅受到初始选择的限制,而且由于与自我的交叉反应,随后的死亡也受到限制.
- 比以前假设的,T细胞受体谱可能更广泛地倾向于识别MHC分子.
- 单个MHC/选择揭示了以前未被理解的小腺体中剧目限制的机制.
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