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Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

3.7K
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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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...
6.9K
Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

2.1K
Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
2.1K
T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

13.7K
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.
Naive T cells that have not yet encountered an antigen express two primary CD...
13.7K
B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

14.4K
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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Defense Against Bacterial Pathogens01:31

Defense Against Bacterial Pathogens

3.0K
The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
Phagocytes are the frontline soldiers of the immune system. They include neutrophils and macrophages. Neutrophils are the most abundant type of white blood cell and are quickly mobilized to the site of infection. Macrophages are larger cells that patrol...
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関連する実験動画

Updated: May 2, 2026

Unraveling Key Players of Humoral Immunity: Advanced and Optimized Lymphocyte Isolation Protocol from Murine Peyer's Patches
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ペイヤーのパッチ生殖センターにおけるBCRの選択と親和性の成熟

Huan Chen1,2,3, Yuxiang Zhang1,2,3, Adam Yongxin Ye1,2,3

  • 1Program in Cellular and Molecular Medicine, Boston Children's Hospital, Boston, MA, USA.

Nature
|June 6, 2020
PubMed
まとめ

腸内微生物群はマウスペイヤーパッチのB細胞受容体レパートリーに影響を与え,細菌のグリカンに反応する特定の抗体クローンタイプを選択します. この研究は,持続的な腸の抗原が 慢性的な生殖中心の反応と抗体の親和性成熟を 駆動する方法を明らかにしています

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In Vitro Differentiation Model of Human Normal Memory B Cells to Long-lived Plasma Cells
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In Vitro Differentiation Model of Human Normal Memory B Cells to Long-lived Plasma Cells

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Analysis of Somatic Hypermutation in the JH4 intron of Germinal Center B cells from Mouse Peyer's Patches
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Analysis of Somatic Hypermutation in the JH4 intron of Germinal Center B cells from Mouse Peyer's Patches

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関連する実験動画

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Published on: November 21, 2018

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In Vitro Differentiation Model of Human Normal Memory B Cells to Long-lived Plasma Cells
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In Vitro Differentiation Model of Human Normal Memory B Cells to Long-lived Plasma Cells

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Analysis of Somatic Hypermutation in the JH4 intron of Germinal Center B cells from Mouse Peyer's Patches
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Analysis of Somatic Hypermutation in the JH4 intron of Germinal Center B cells from Mouse Peyer's Patches

Published on: April 20, 2021

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科学分野:

  • 免疫学
  • 微生物学
  • 遺伝学

背景:

  • B細胞受容体 (BCR) と抗体は免疫反応に不可欠であり,その多様性はV(D) J再結合によって生成されます.
  • ゲルミナルセンター (GC) はB細胞の成熟の場所ですが,ペイヤー・パッチ (PP) の慢性GCとそのBCRレパートリーはまだよくわかっていません.
  • 腸内微生物群は,PPの発達を含む腸内免疫に重大な影響を及ぼします.

研究 の 目的:

  • マウスPPGCにおける生理学的BCRレパートリーと体的ハイパーミューテーションパターンの解明.
  • PPs内のBCRレパートリーを形成する腸内微生物群の役割を調査する.
  • 慢性 PP GC の選択メカニズムと親和性成熟プロセスを理解する.

主な方法:

  • マウス PP GCにおけるV(D) Jセグメント使用と体内のハイパーミューテーションプロフィールを分析するための高通量シーケンシング.
  • 特定の腸内微生物群を持つマウスのBCRレパートリーの比較分析
  • 特定の病原体のないマウスから細菌のないマウスへの糞便の微生物移転実験

主要な成果:

  • マウスのPPGCは,公的なBCRのクローン型をカノン的なCDR3で拡張し,V(D) J再結合のジャンクションバイアスのために頻繁に観察される.
  • 公共のクローンタイプは微生物群に依存し,細菌のグリカンに反応する抗体をコードし,他は独立している.
  • 糞便の移転により 細菌に依存するクローン型が回復し 腸内微生物群によるBCRの選択が直接関与しました 繰り返し発生する体内の多変異は,PP GCにおける親和性の成熟を示している.

結論:

  • 持続的な腸内抗原は再発したBCRのクローンタイプを選択し,慢性的なPPGC応答を発生させます.
  • 腸内微生物群は,ペイヤーパッチのBCRレパートリーと免疫反応の形成に重要な役割を果たします.
  • アフィニティ成熟は,抗原選択によって誘発される,マウスPPGCで,ホメオスタティックな条件下で発生する.