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関連する概念動画

Immunological Memory01:23

Immunological Memory

6.7K
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.
What is Immunological Memory?
Immunological memory is an integral function of the immune system that allows it to recognize and react more rapidly and effectively to pathogens previously encountered. This feature...
6.7K
Vaccinations01:51

Vaccinations

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Overview
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Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

5.0K
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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Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

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The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
988
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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Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

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Overview
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関連する実験動画

Updated: Sep 26, 2025

Application of Long-term cultured Interferon-&#947; Enzyme-linked Immunospot Assay for Assessing Effector and Memory T Cell Responses in Cattle
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SARS-CoV-2 mRNAブースト後の記憶B細胞の効能と幅の増加

Frauke Muecksch1, Zijun Wang2, Alice Cho2

  • 1Laboratory of Retrovirology, The Rockefeller University, New York, NY, USA.

Nature
|April 21, 2022
PubMed
まとめ

3回目のmRNAワクチンは,受容体結合ドメイン特異の記憶B細胞を増加させ,抗体の効能と幅を高めます. この改善された免疫反応は,SARS-CoV-2 オミクロン変種を効果的に中和させ,重症な病気から保護します.

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科学分野:

  • 免疫学
  • ウイルス学
  • ワクチン学

背景:

  • SARS-CoV-2のオミクロン変種は,ワクチン接種または以前に感染した個人を感染させる可能性があります.
  • 3回のmRNAワクチンは,感染に対する保護が低下したにもかかわらず,重症な病気に対する高い保護を提供します.

研究 の 目的:

  • 3回のmRNAワクチン接種後に記憶B細胞のレパートリーを検査する.
  • SARS-CoV-2 変種に対する抗体の効能と幅に対する第 3 回の投与量の影響を理解する.

主な方法:

  • mRNAワクチンの3回投与を受けた個人を対象とした長期コホート研究.
  • 受容体結合領域 (RBD) 固有の記憶B細胞とそのエンコードされた抗体解析.

主要な成果:

  • 3回目のmRNAワクチンは,RBD特異的な記憶B細胞を増加させ,進化させた.
  • これらの細胞からの抗体は,保存されたRBD領域を標的とした新しいクローンで,効能と幅が増加した.
  • 分析された中和抗体の50%以上は,第3の投与後にオミクロン変異体を中和させた.

結論:

  • 3つのmRNAワクチンは,オミクロンのようなSARS-CoV-2変種に反応できる多様な記憶B細胞のレパートリーを誘発する.
  • この強化された免疫反応は,変異によって引き起こされる重症疾患に対する第3回の投与の有効性を説明する.