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CD5+ B cells and the immune system

P M Lydyard1, A Lamour, L E MacKenzie

  • 1Department of Immunology, University College of London Medical School, U.K.

Immunology Letters
|October 1, 1993
PubMed
Summary
This summary is machine-generated.

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CD5+ B cells are important in early immune system development and may represent a distinct lineage. Their frequency is genetically influenced, and they produce cytokines like IL-10.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • The CD5+ B-cell population is significant in early immune system development.
  • CD5+ B cells are considered a distinct lineage from CD5- B cells based on mouse transplantation studies.
  • The role of CD5 as a lineage marker versus an activation antigen on B cells is still debated in both mice and humans.

Purpose of the Study:

  • To explore the characteristics and potential functions of CD5+ B cells.
  • To investigate the genetic influences on CD5+ B cell frequency.
  • To understand the cytokine interactions and antibody production of CD5+ B cells.

Main Methods:

  • Transplantation studies in mice.
  • Analysis of CD5 expression on B cells.
  • Cytokine receptor analysis (IL-2, IL-5).

Related Experiment Videos

  • Cytokine production assays (IL-10).
  • Analysis of immunoglobulin gene mutation status and antibody characteristics.

    • Main Results:

    • CD5+ B cell frequency is influenced by genetic factors.
    • CD5+ B cells respond to cytokines like IL-2 and IL-5.
    • These cells produce cytokines, notably IL-10.
    • CD5+ B cells utilize minimally mutated germ-line genes.
    • They produce low avidity auto- and polyreactive antibodies, typically of the IgM class (natural antibodies).

    Conclusions:

    • CD5+ B cells play a crucial role in immune system ontogeny.
    • The CD5 molecule's function on B cells remains unclear but may involve CD72 interactions.
    • CD5+ B cells are characterized by their production of natural antibodies and responsiveness to specific cytokines.