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CD19 expression levels regulate B lymphocyte development: human CD19 restores normal function in mice lacking

S Sato1, D A Steeber, P J Jansen

  • 1Department of Immunology, Duke University Medical Center, Durham, NC 27710, USA.

Journal of Immunology (Baltimore, Md. : 1950)
|May 15, 1997
PubMed
Summary
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Altering CD19 signaling thresholds in B lymphocytes critically impacts immune responses. CD19 levels regulate B cell development, antibody production, and immune tolerance, suggesting conserved functions in mice and humans.

Area of Science:

  • Immunology
  • Molecular Biology

Background:

  • Signal transduction thresholds are crucial for B lymphocyte responses to foreign antigens and self-tolerance.
  • Dysregulation of these thresholds can impair humoral immunity.

Purpose of the Study:

  • To investigate the effects of altered signaling thresholds in B lymphocytes by examining CD19-deficient and transgenic mice with varying CD19 expression levels.
  • To determine the role of CD19 in regulating B cell development, activation, and differentiation.

Main Methods:

  • Utilized CD19-deficient mice and transgenic mice expressing human CD19 at different densities.
  • Analyzed B cell development, surface marker expression (IgM), mitogen responses, serum immunoglobulin levels, and germinal center formation.

Main Results:

Related Experiment Videos

  • Human CD19 restored normal B cell function in CD19-deficient mice at physiological expression levels.
  • Altered CD19 expression (two- to threefold changes) in transgenic mice significantly impacted B cell development, immune responses, and germinal center formation.
  • Overexpression of CD19 led to decreased surface IgM and a phenotype indicative of increased signaling.

Conclusions:

  • CD19 plays a critical role in defining signaling thresholds for B lymphocyte selection, activation, and differentiation.
  • CD19 appears to have conserved functions in both mice and humans.
  • Tightly controlling CD19 expression is essential for maintaining normal humoral immune responses and self-tolerance.