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脂肪酸代謝を調節することによってCD8T細胞の記憶を強化する.
Erika L Pearce1, Matthew C Walsh, Pedro J Cejas
1Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania 19104, USA.
Nature
|June 5, 2009
まとめ
腫瘍死滅因子受容体関連因子6 (TRAF6) は,脂肪酸代謝を調節することにより,長寿のCD8記憶T細胞を生成するために不可欠です. 抗糖尿病薬であるメトホルミンは,記憶細胞の生成を回復し,抗癌ワクチンの有効性を高めました.
科学分野:
- 免疫学 免疫学とは
- 細胞の代謝について
背景:
- CD8T細胞は,感染症や癌に対する免疫に不可欠です.
- 細胞の発達には,膨張,収縮,そして長寿記憶細胞の形成が伴う.
- 記憶T細胞生成を調節するメカニズムは不明である.
研究 の 目的:
- CD8メモリT細胞発現における腫瘍死滅因子 (TNF) 受容体関連因子6 (TRAF6) の役割を調査する.
- TRAF6がCD8T細胞の脂肪酸代謝にどのように影響するかを理解する.
- 記憶のT細胞生成を強化するための治療戦略を探求する.
主な方法:
- トラフ6.6のT細胞特異的なデリレーションを持つマウスを生成した.
- 拡張,収縮,記憶形成を含むCD8 T細胞の反応を分析した.
- 脂肪酸代謝に関連する遺伝子発現を評価するためにマイクロアレイ分析を使用しました.
- 測定されたAMP活性化キナーゼ活性化とミトコンドリア脂肪酸酸化 (FAO).
- FAOとメモリT細胞生成に与える影響を評価するために,メトホルミンを投与した.
主要な成果:
- T細胞特異的なTRAF6の削除は,強力なエフェクターCD8T細胞の反応をもたらしたが,メモリT細胞の生成を阻害した.
- TRAF6欠乏のCD8T細胞は,脂肪酸代謝経路における遺伝子発現の変化を示した.
- これらの細胞は,成長因子離脱時に欠陥のあるAMP活性化キナーゼ活性化とミトコンドリアのFAOを示した.
- メトホルミン治療は,TRAF6欠乏したマウスでFAOを回復し,CD8記憶T細胞の生成を救出しました.
- メトフォーミンはまた,野生型のマウスのCD8メモリT細胞を増加させ,抗がんワクチンの有効性を改善しました.
結論:
- TRAF6は,主に脂肪酸代謝を調節することによって,CD8記憶T細胞発達の主要な調節剤である.
- TRAF6の欠陥はミトコンドリアのFAOを損なっており,記憶細胞の形成を妨げています.
- メトホルミンは,トラフ6欠乏による記憶T細胞生成の欠陥を克服し,ワクチンの有効性を高めることができます.
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