Tyrosine phosphatase CD45 is required for T-cell antigen receptor and CD2-mediated activation of a protein tyrosine kinase and interleukin 2 production Academic Article uri icon


MeSH Major

  • Antigens, CD
  • Antigens, Differentiation
  • Antigens, Differentiation, T-Lymphocyte
  • Histocompatibility Antigens
  • Interleukin-2
  • Phosphoprotein Phosphatases
  • Protein-Tyrosine Kinases
  • Receptors, Antigen, T-Cell
  • Receptors, Immunologic


  • CD45, a hematopoietic cell-specific surface antigen, has recently been shown to be a protein tyrosine phosphatase. Expression of CD45 is essential for the T-cell antigen receptor to couple with the phosphatidylinositol second messenger pathway and for antigen-mediated proliferation of T lymphocytes. In this report we describe a CD45-deficient mutant of the human T-cell leukemia line Jurkat. CD45 expression is required for the activation of a T-cell receptor-associated tyrosine kinase as well as the phosphatidylinositol pathway. Additionally, stimulation of T lymphocytes by way of the accessory molecule CD2 requires the expression of CD45. The mutation in the CD45-deficient cell specifically impairs signal transduction by the T-cell receptor and CD2 because activation events by way of another accessory molecule, CD28, are unimpaired.

publication date

  • December 1991



  • Academic Article



  • eng

PubMed Central ID

  • PMC51163

PubMed ID

  • 1672451

Additional Document Info

start page

  • 2037

end page

  • 41


  • 88


  • 6