ウイルスの特異的なCD8+T細胞記憶は,クローナルバーストのサイズによって決定されます
1Department of Immunology, St Jude Children's Research Hospital, Memphis, Tennessee 38105.
Nature
|June 23, 1994
まとめ
ウイルスの特異的なCD8+T細胞記憶は,連続したウイルス抗原曝露なしに長期にわたって持続します. この研究は,記憶T細胞が,持続的なウイルスペプチド源とは無関係に維持されていることを示しています.
科学分野:
- 免疫学 免疫学とは
- ウイルス学 ウイルス学 ウイルス学
- T細胞の記憶に関する研究
背景:
- 一部のウイルスは生涯にわたる感染を確立しますが,インフルエンザAのようなウイルスは,CD8+T細胞の免疫を定期的に強化する必要があります.
- 長期にわたるCD8+T細胞記憶は,典型的には再発しないまたは宿主ゲノムに持続するウイルスに観察されています.
- これはCD8+T細胞の記憶が,継続的または中断的な抗原被曝に依存しない可能性があることを示唆しています.
研究 の 目的:
- CD8+T細胞の長期記憶を維持するメカニズムを調査する.
- ウイルスの特異的なCD8+T細胞記憶を維持するために持続性ウイルス抗原が不可欠であるかどうかを判断する.
- 検出可能なウイルスペプチド源がない場合にCD8+T細胞記憶の長寿を評価する.
主な方法:
- ウイルス特異のCD8+メモリT細胞の養子移植は,素朴で以前に感染した受容体マウスに.
- ウイルスの抗原を用いたリスティミュレーションアッセイで,クローン拡張と記憶細胞検出を評価する.
- 照射されたマウスとベータ2マイクログローブリン欠乏症のマウスにおけるT細胞維持の分析.
- ウイルス抗体およびペプチドの検出 受容体マウスで抗原の持続性を評価する.
主要な成果:
- センダイウイルス抗原による再刺激は,キメリックマウスの細胞毒性Tリンパ球前駆体 (CTLp) の記憶を有意に増加させた.
- 仙台ウイルスに特異的なCTLpは,放射線を浴びた未感染の受容体で250日以上維持されました.
- ウイルスの特異的なCD8+記憶T細胞は,検出可能なウイルス抗体またはタンパク質の貯蔵が欠如した素朴な受容者に100日以上維持されました.
結論:
- CD8+T細胞の記憶は,継続的なウイルス抗原暴露とは無関係に長期間維持できます.
- この研究では,記憶T細胞集団を維持する持続的なウイルスタンパク質貯蔵の証拠は見つかりませんでした.
- これらの発見は,ウイルスの特異性のあるCD8+T細胞の長期記憶のための持続性抗原の必要性に異議を唱える.
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