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Related Concept Videos

B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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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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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Examination of Thymic Positive and Negative Selection by Flow Cytometry
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Published on: October 8, 2012

CD72, a coreceptor with both positive and negative effects on B lymphocyte development and function.

Hsin-Jung Wu1, Subbarao Bondada

  • 1Section on Immunology and Immunogenetics, Joslin Diabetes Center, Harvard Medical School, Boston, MA 02115, USA.

Journal of Clinical Immunology
|December 11, 2008
PubMed
Summary

CD72, a B cell coreceptor, enhances B cell receptor signaling by interacting with both positive and negative regulators, impacting B cell growth and differentiation. Its deficiency is linked to autoimmunity.

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Area of Science:

  • Immunology
  • Cell Signaling

Background:

  • B lymphocytes are activated by B cell receptor (BCR) signaling.
  • B cell coreceptors modulate BCR signaling thresholds for growth and differentiation.
  • CD72 is a B cell coreceptor that enhances BCR signaling through interaction with CD100.

Purpose of the Study:

  • To investigate the dual signaling role of CD72 in B cell activation.
  • To elucidate the molecular mechanisms underlying CD72-mediated B cell signaling.
  • To explore the implications of CD72 function in autoimmunity.

Main Methods:

  • Analysis of signaling events downstream of CD72 ligation.
  • Investigation of CD72 interactions with signaling molecules (e.g., SHP-1, Grb2, CD19).
  • Assessment of B cell responses in CD72-deficient and CD100-null models.

Main Results:

  • CD72 ligation activates Src kinases (Blk, Lyn) and Btk, leading to MAP kinase activation.
  • CD72 signaling can restore responsiveness in Btk-deficient B cells.
  • BCR signaling is enhanced in CD72-deficient cells but reduced in CD100-null cells.

Conclusions:

  • CD72 exhibits dual signaling properties, interacting with both positive (e.g., CD19) and negative (e.g., SHP-1) regulators.
  • A dual signaling hypothesis explains CD72's role in promoting B cell growth and differentiation.
  • CD72 and CD100 deficiencies lead to autoimmunity; CD72 polymorphisms are associated with autoimmune diseases.