鉴定了一种Tap-依赖的领导,被特定于Ib类抗原的全活性T细胞识别出来
C J Aldrich1, A DeCloux, A S Woods
1Department of Microbiology, University of Texas Southwestern Medical Center at Dallas 75235-9048.
Cell
|November 18, 1994
概括
Qa-1决定性修饰剂 (Qdm) 基因对于细胞毒性T淋巴细胞 (CTL) 对Ib类抗原Qa-1的识别至关重要. 大多数D等位基因作为Qdm起作用,一个特定的可以恢复CTL识别.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- T细胞生物学T细胞生物学
背景情况:
- 对Ib类抗原Qa-1的细胞毒性T淋巴细胞 (CTL) 识别通常取决于额外的基因,Qa-1决定性修饰剂 (Qdm).
- 在CTL识别和抗原呈现中Qdm的作用背后的精确分子机制仍然不完全理解.
研究的目的:
- 确定Qdm的分子特征及其在Qa-1的CTL识别中的作用.
- 为了研究来自D alloantigens的特定序对CTL识别的影响.
- 探索载体在Qdm相关的呈现中的参与.
主要方法:
- 基因分析以确定Qdm,揭示其与大多数D等位基因 (Dk除外) 的身份.
- 使用来自D抗原的非胺来恢复CTL识别的胺分析.
- 评估CTL对修饰的识别以及Tap载体在表达中的作用.
主要成果:
- 发现qdm与大多数D等位基因相同,Dk是例外.
- 来自D alloantigens的非氨基恢复了Qdm缺乏细胞上的CTL识别.
- 一种变异的Dk,在P3处具有Ala到Val的替代,需要显著更多的用于细胞溶解,而Tap转运器对于Qdm的表达是必要的.
结论:
- 该研究确定Qdm主要是D等位基因,并表明特定的D衍生可以恢复CTLs对Qa-1的识别.
- 这些发现突显了序和呈现途径,包括Tap载体在CTL全活性中的重要性.
- 这项工作为剖析基活性和理解涉及Ib类分子的抗原呈现途径提供了有价值的模型.
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