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T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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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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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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Notch signaling was first discovered in Drosophila melanogaster, where it is involved in cell lineage differentiation. Notch signaling regulates the maintenance and differentiation of intestinal stem cells or ISCs by controlling the expression of atonal homolog 1 or Atoh1. Atoh1 directs cells to differentiate into secretory cells.
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When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
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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.
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Integrin CD11c regulates B cell homeostasis.

Lifei Hou1,2, Yi-Cheng Sin3, Yue Chen3

  • 1Department of Anesthesiology, Critical Care and Pain Medicine, Cardiac Anesthesia Division, Boston Children's Hospital, Boston, MA, United States.

Frontiers in Immunology
|February 21, 2024
PubMed
Summary

CD11c regulates B cell counts by influencing macrophage migration inhibitory factor (MIF) produced by dendritic cells. This study reveals a novel indirect mechanism controlling B cell survival and proliferation.

Keywords:
B cellCD11cMIFdendritic cellintegrin

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • CD11c is a known dendritic cell marker, but also regulates neutrophil and T cell functions.
  • CD11c knockout mice exhibit reduced B cell counts, prompting further investigation into B cell development and regulation.

Purpose of the Study:

  • To investigate the role of CD11c in B cell development and function.
  • To elucidate the mechanism by which CD11c influences B cell proliferation and apoptosis.

Main Methods:

  • Characterization of B cell profiles in CD11c knockout mice.
  • Proteomic analysis of dendritic cells.
  • Enzyme-linked immunosorbent assay (ELISA) for MIF quantification.

Main Results:

  • CD11c knockout mice showed significantly fewer recirculating and mature B cells.
  • Exaggerated proliferation and apoptosis were observed in B cells from CD11c knockout mice.
  • Dendritic cell proteomics revealed downregulation of macrophage migration inhibitory factor (MIF); plasma MIF levels were lower in CD11c knockout mice.

Conclusions:

  • CD11c plays a critical role in regulating B cell numbers and function.
  • Dendritic cells, via CD11c expression, indirectly regulate B cell survival and proliferation through modulation of MIF.
  • This study uncovers a novel CD11c-mediated regulatory pathway for naive B cells.