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CD45 up-regulation during lymphocyte maturation

J Kirberg1, T Brocker

  • 1Basel Institute for Immunology, Switzerland.

International Immunology
|November 1, 1996
PubMed
Summary
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CD45 protein tyrosine phosphatase is upregulated during T cell positive selection in the thymus. This CD45 upregulation is linked to T cell receptor signaling and may adapt CD45 levels for mature T and B cells.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • T cell maturation involves positive selection in the thymus.
  • This process requires T cell receptor (TCR) and self-major histocompatibility complex (MHC) interactions.
  • CD45 is a transmembrane protein tyrosine phosphatase crucial for immune cell signaling.

Purpose of the Study:

  • To analyze the differential surface expression of CD45 during T cell maturation.
  • To investigate the relationship between CD45 expression and T cell activation markers during thymic positive selection.

Main Methods:

  • Four-color Fluorescence-Activated Cell Sorting (FACS) analysis.
  • Analysis of thymocytes from normal and TCR-transgenic mice.

Main Results:

Related Experiment Videos

  • CD45 is upregulated during thymic positive selection, coinciding with TCR-CD3 complex and CD69 expression.
  • CD45 upregulation precedes the downregulation of heat stable antigen.
  • The findings suggest a role for CD45 in modulating TCR-CD3 signal transduction during positive selection.

Conclusions:

  • CD45 expression is dynamically regulated during T cell development.
  • CD45 tyrosine phosphatase activity is critical for TCR signaling during positive selection.
  • This regulation may adapt CD45 levels to antigen receptor expression in mature lymphocytes.