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Related Concept Videos

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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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.
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Interrogating Individual Autoreactive Germinal Centers by Photoactivation in a Mixed Chimeric Model of Autoimmunity
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Germinal Center Reaction.

Chuanxin Huang1

  • 1Shanghai Jiao Tong University School of Medicine, Shanghai, 200025, China. huangcx@shsmu.edu.cn.

Advances in Experimental Medicine and Biology
|April 24, 2020
PubMed
Summary
This summary is machine-generated.

Germinal centers (GCs) are crucial for adaptive immunity, enabling B cells to develop high-affinity antibodies. This process involves specific cellular interactions and transcription factors that control GC formation, maintenance, and B cell selection.

Keywords:
Affinity selectionClass switch recombinationFollicular dendritic cellGerminal center BSomatic hypermutationT follicular helper cells

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • Germinal centers (GCs) are transient structures in lymphoid tissues essential for adaptive immune responses.
  • GCs consist of a dark zone (DZ) and a light zone (LZ), each with distinct B cell functions.
  • GC B cells undergo somatic hypermutation and selection to produce high-affinity antibodies.

Purpose of the Study:

  • To discuss the cellular and molecular signals governing germinal center formation and maintenance.
  • To explain the mechanisms of B cell selection within germinal centers.
  • To highlight the role of key transcription factors in regulating the germinal center reaction.

Main Methods:

  • Review of cellular interactions, including T follicular helper (Tfh) cells and follicular dendritic cells (FDCs).
  • Analysis of molecular signals, focusing on activation-induced cytidine deaminase (AID) and transcription factors.
  • Discussion of B cell differentiation pathways into memory B cells (MBCs) and plasma cells (PCs).

Main Results:

  • B cells in the DZ undergo clonal expansion and immunoglobulin variable (IgV) gene hypermutation.
  • Selection in the LZ favors B cells with higher antigen affinity, leading to differentiation into MBCs and PCs.
  • Class switch recombination also occurs in the LZ, further diversifying antibody responses.

Conclusions:

  • The germinal center reaction is a complex, tightly regulated process involving multiple immune cells and signaling pathways.
  • Transcription factors play a critical role in controlling GC formation, maintenance, and B cell selection.
  • Understanding these mechanisms is vital for developing effective vaccines and therapies for immune disorders.