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Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

554
An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and...
554
Allergic Reactions02:06

Allergic Reactions

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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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Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

892
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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Cross-reactivity00:42

Cross-reactivity

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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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Investigating Mast Cell Secretory Granules; from Biosynthesis to Exocytosis
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マスト細胞は,免疫感知と抗原回避行動とを結びつける.

Thomas Plum1, Rebecca Binzberger2,3, Robin Thiele2,3

  • 1Division for Cellular Immunology, German Cancer Research Center, Heidelberg, Germany. t.plum@dkfz.de.

Nature
|July 12, 2023
PubMed
まとめ

マスト細胞は抗原の認識を 回避行動と結びつけ 有害な免疫反応を防止します このIgEに依存するメカニズムは,再暴露時に抗原の摂取を止め,炎症から保護します.

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科学分野:

  • 免疫学
  • 神経科学
  • 行動科学

背景:

  • マスト細胞は2型免疫およびアレルギー疾患において重要な役割を果たし,しばしば免疫グロブリンE (IgE) と関連しています.
  • アレルギー症状は有害物質を排出するのに役立ちますが,積極的な回避行動におけるその役割は不明です.

研究 の 目的:

  • 抗原認識と回避行動を結びつける 免疫センサー細胞を特定する
  • マスト細胞による抗原特異回避行動の基礎となるメカニズムを解明する.

主な方法:

  • 抗原特異的回避行動の研究に同種マウスモデルを使用した.
  • マスト細胞,IgE,Th2サイトカイン,および白血球合成の役割を調査した.
  • 変異したマウスを使って 薬学的な抑制や 神経記録と 信号伝達経路を 探査した

主要な成果:

  • マウスの抗原特異回避行動は マスト細胞に大きく依存する.
  • 抗原による免疫活性化と胃腸内炎症を予防した.
  • 胃と小腸のマスト細胞はすぐに摂取された抗原を感知し,IgEに依存した方法で回避をシグナルします.

結論:

  • マスト細胞は免疫学的センサーとして働き,過去の免疫反応 (IgE経由) を,抗原再暴露時の即時回避行動と結びつける.
  • マスト細胞による抗原回避は,無害な抗原や毒素に対する有害で継続的な反応を防ぐために重要な免疫メカニズムです.