病毒特定的CD8+T细胞记忆是由克隆突破大小决定的
1Department of Immunology, St Jude Children's Research Hospital, Memphis, Tennessee 38105.
Nature
|June 23, 1994
概括
病毒特异性CD8+T细胞记忆在没有持续的病毒抗原暴露的情况下长期存在. 这项研究表明,记忆T细胞是独立于持久性病毒源保持的.
科学领域:
- 免疫学 免疫学 免疫学
- 病毒学 病毒学
- T细胞记忆研究研究
背景情况:
- 一些病毒会导致终身感染,而其他病毒 (如甲型流感) 则需要定期增强CD8+T细胞免疫力.
- 长期的CD8+T细胞记忆被观察到对于通常不会再次遇到或在宿主基因组中持续存在的病毒.
- 这表明CD8+T细胞记忆可能不依赖于持续或间歇性抗原暴露.
研究的目的:
- 研究维持长期CD8+T细胞记忆的机制.
- 确定持久性病毒抗原是否对于维持病毒特异性CD8+T细胞记忆至关重要.
- 在没有可检测的病毒源的情况下,评估CD8+T细胞记忆的寿命.
主要方法:
- 病毒特异性CD8+记忆T细胞的采用转移到原始和先前感染的接受者小鼠中.
- 用病毒抗原进行再刺激测试,以评估克隆扩张和记忆细胞检测.
- 对照射和缺乏β2-微球蛋白的小鼠T细胞维护的分析.
- 在接受者小鼠中检测病毒抗体和,以评估抗原持久性.
主要成果:
- 用仙台病毒抗原进行再刺激,显著增加了奇默小鼠的细胞毒性T淋巴细胞前体 (CTLp) 的记忆.
- 仙台病毒特异性CTLp在未受感染的接受者中维持了250多天.
- 在缺乏可检测的病毒抗体或蛋白质储存的天真接受者中,病毒特异性的CD8+记忆T细胞维持了100多天.
结论:
- CD8+ T细胞记忆可以保持长时间,而不依赖于持续的病毒抗原暴露.
- 该研究没有发现持续的病毒蛋白储存维持记忆T细胞种群的证据.
- 这些发现挑战了对长期病毒特异性CD8+T细胞记忆的持久抗原的必要性.
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