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Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

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The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
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The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
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T細胞におけるRASA2の消去は,抗原の感受性と長期的な機能を高める.

Julia Carnevale1,2,3,4, Eric Shifrut5,6,7,8, Nupura Kale9,10

  • 1Gladstone-UCSF Institute of Genomic Immunology, San Francisco, CA, USA. julia.carnevale@ucsf.edu.

Nature
|August 24, 2022
PubMed
まとめ

研究者らはRASA2を養子T細胞治療の改善の鍵となる標的として特定した. RASA2を標的にすることでT細胞の機能を向上させることで,抗がん活動と耐久性を高め,がん治療の新たな希望をもたらします.

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科学分野:

  • 免疫学
  • 癌 生物学
  • 遺伝子編集

背景:

  • アドプティブT細胞治療の有効性は,免疫抑制信号と固有の抑制チェックポイントによって制限されています.
  • 標的型遺伝子編集は これらの限界を克服し T細胞の機能を高める 戦略を提供します

研究 の 目的:

  • 免疫抑制条件下で全ゲノムCRISPRスクリーンを用いてT細胞機能障害を予防する標的となる遺伝子を特定する.
  • RASA2がヒトのT細胞におけるシグナルチェックポイントとしての役割と,その治療標的としての可能性を調査する.

主な方法:

  • 様々な免疫抑制条件下で複数の全ゲノム CRISPR ノックアウトスクリーンを実施した.
  • MAPKシグナル伝達とCART細胞活動を含むT細胞のシグナル伝達と機能におけるRASA2の役割を調査した.
  • T細胞受容体とCAR T細胞療法における臨床前モデルのRASA2アブレーションの有効性を評価した.

主要な成果:

  • T細胞のシグナリングチェックポイントとして識別されたRAS GTPase活性化タンパク質 (RasGAP) RASA2に収束した.
  • RASA2の消去により,MAPKのシグナル伝達とキメリック抗原受容体 (CAR) T細胞の細胞分解活性が強化された.
  • RASA2欠乏のT細胞は活性化,サイトカインの産生,代謝活動,および持続的な癌細胞の殺戮が増加した.
  • RASA2 ノックアウトのCAR T細胞は,体内で競争力の優位性を示し,RASA2 消去は臨床前モデルで生存期間を延長した.

結論:

  • RASA2は,がん治療におけるT細胞の持続性およびエフェクター機能を強化する有望な標的である.
  • RASA2をターゲットにすることで,T細胞機能不全を克服し,採用T細胞治療の成果を向上させることができます.
  • RASA2を標的にする遺伝子編集戦略は,より効果的ながん治療を開発する可能性を秘めています.