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関連する概念動画

T Cell Types and Functions01:24

T Cell Types and Functions

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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
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B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
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Cytotoxic T Cells-mediated Immune Response

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Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...
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cAMP-dependent Protein Kinase Pathways01:25

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Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...
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The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors...
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The JAK-STAT Signaling Pathway01:20

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Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...
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Isolation and Th17 Differentiation of Na&#239;ve CD4 T Lymphocytes
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LKB1-ミトコンドリア軸はTH17エフェクタ機能を制御する.

Francesc Baixauli1, Klara Piletic1, Daniel J Puleston1

  • 1Max Planck Institute for Immunobiology and Epigenetics, Freiburg, Germany.

Nature
|September 28, 2022
PubMed
まとめ

ミトコンドリア融合タンパク質OPA1は,Tヘルパー17 (TH17) 細胞機能に不可欠である. 肝関連キナーゼB1 (LKB1) は,ミトコンドリアの変化をTH17細胞のサイトカイン発現と結びつける.

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科学分野:

  • 免疫学
  • 細胞生物学
  • 代謝生物学

背景:

  • CD4+ T細胞の分化には代謝の再プログラムが必要です.
  • ミトコンドリア膜のダイナミクスは細胞プロセスに不可欠ですが,T細胞の分化における役割は不明です.

研究 の 目的:

  • CD4+ T細胞の分化におけるミトコンドリア膜ダイナミクス,特にOPA1の役割を調査する.
  • ミトコンドリア機能がTH17細胞エフェクタープログラムに影響を与えるメカニズムを解明する.

主な方法:

  • マウスにおけるOPA1のT細胞特異的消去
  • マルチオミクス分析 (メタボロミクス,トランスクリプトミクス)
  • ミトコンドリアの呼吸,TCAサイクルフルス,代謝物質のレベルを評価する生化学的測定.

主要な成果:

  • TH17細胞は,他のCD4+T細胞サブセットとは異なり,緊密な結晶を持つ融合したミトコンドリアを示す.
  • TH17細胞におけるOPA1の消去は,TCAサイクル代謝を阻害し,代謝物質のプロファイルと表遺伝的変化を引き起こします.
  • LKB1はセンサとして作用し,ミトコンドリア膜の状態とTH17細胞のIL-17発現を結びつける.

結論:

  • OPA1はTH17細胞の代謝と機能の重要なレギュラーである.
  • LKB1は,TH17細胞エフェクター分化を制御するミトコンドリアのシグナルを統合する.
  • OPA1またはLKB1をターゲットにすることで,TH17細胞媒介疾患の治療戦略を提供することができます.