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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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Development of Immunocompetence01:22

Development of Immunocompetence

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The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
The initial cells that migrate from the fetal thymus settle within the skin and epithelial tissues lining the mouth, digestive tract, and in females, the uterus and vagina. These cells, including skin-based dendritic cells, serve as antigen-presenting cells, playing a key role in T cell activation.
Subsequent T...
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B Cell Activation and Differentiation01:24

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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.
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Immunological Memory01:23

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Immunological memory, a pivotal pillar of the adaptive immune system, is responsible for the body's ability to remember and respond more swiftly and effectively to previously encountered pathogens. This remarkable feature is what makes vaccines so effective in preventing diseases.
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Immunodeficiency Diseases01:25

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Immunodeficiency disorders are conditions in which the immune system's ability to fight infectious disease and cancer is compromised or entirely absent. The immune system comprises a complex network of cells, tissues, and organs that work together to protect the body from potentially harmful invaders. When this system is deficient or not functioning properly, it leaves the body susceptible to infections, diseases, or other complications.
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ILC2によるLIFライセンスは,組織免疫から全身免疫への進化

Mayuri Gogoi1, Paula A Clark2, Ana C F Ferreira2

  • 1MRC Laboratory of Molecular Biology, Cambridge, UK. mgogoi@mrc-lmb.cam.ac.uk.

Nature
|August 7, 2024
PubMed
まとめ

免疫細胞が肺を離れリンパ節に移動するには,先天性リンパ球 (ILC2) から発生した白血病抑制因子 (LIF) が不可欠です. LIFがなければ,免疫細胞の移動が阻害され,肺免疫と全身反応に影響する.

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科学分野:

  • 免疫学
  • 細胞生物学
  • 呼吸器医学

背景:

  • 免疫細胞の密輸は 監視と免疫反応に不可欠です
  • 粘着とケモカイン受容体は免疫細胞を特定の組織とリンパ系に誘導する.
  • 群2の先天性リンパ球 (ILC2) は組織免疫に作用する.

研究 の 目的:

  • ILC2sによって生成される白血病抑制因子 (LIF) の肺からの免疫細胞移動における役割を調査する.
  • ウイルス感染やアレルギーのときの免疫反応に LIF がどのように影響するかを理解する.
  • ILC2が免疫細胞をリンパ節に誘導するメカニズムを解明する.

主な方法:

  • ILC2sからのLIF生成の障害が免疫細胞の移動に与える影響を調査した.
  • ウイルス感染とアレルゲン感染後の肺とリンパ節の免疫細胞分布を分析した.
  • リンパ内皮細胞と免疫細胞におけるケモカイン (CCL21) と受容体 (CCR7) の発現を調べた.

主要な成果:

  • ILC2sによってLIFの生成が妨げられ,免疫細胞が肺からリンパ節に移動することを防ぐ.
  • LIFが存在しない場合,プラズマ細胞 dendritic cells (pDCs) は肺に留まり,局所抗ウイルス免疫を強化する.
  • 慢性的なアレルゲン刺激は,LIFの欠如により,免疫細胞の蓄積と肺における第三次リンパ性構造の形成につながります.
  • ILC2由来のLIFは,リンパ内皮細胞におけるCCL21の生成を誘導し,CCR7+免疫細胞のリンパ節への誘導を促進する.
  • 免疫細胞がリンパ系に移動できないと,リンパ節の反応が損なわれます.

結論:

  • ILC2由来のLIFは,肺からの免疫細胞排出の重要なレギュラーです.
  • LIFは組織局所免疫と全身免疫反応のバランスを制御する.
  • ILC2sによるLIFの生成は,肺におけるウイルス感染とアレルゲンに対する免疫システムの反応に影響します.