Immunologic Research

, Volume 24, Issue 1, pp 31–52 | Cite as

T cell signal transfuction and the role of CD7 in costimulation

  • Ross Stillwell
  • Barbara E. Bierer


The complex cellular interactions that govern the mammalian immune response are now known to include specific receptor/ligand interaction, recruitment of intracellular signaling molecules, activation of both k in ases and phosphatases, and redustribution of macro-molecular complexes into specific subcellular membrane locations that, in aggregate, result in transcriptional activation. While the TCR-CD3 signal is critical for activation of the resting T cell, it alone is not sufficient to initiate transcriptional activation or generate an effective immune response. A number of other coreceptor molecules, including CD4, CD8, and CD28, have now been characterized that also play important roles in initiating or amplifing the activation of the T cell. A 40 kDa member of the immunoglobulin superfamily, the CD7 molecule, has also been shown to have costimulatory activity and to induce tyrosine and lipid kinase activities. Here we will review the signaling pathways initiated by TCR, CD28, and CD7, as well as the functional consequences of signal transduction through these receptors.

Key words

T cell receptor CD3 CD7 CD28 Coreceptor Costimulation Lymphocyte signal transduction 


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Copyright information

© Humana Press Inc 2001

Authors and Affiliations

  • Ross Stillwell
    • 1
  • Barbara E. Bierer
    • 1
  1. 1.Laboratory of Lymphocyte Biology, Laboratory Research Program, Division of Intramural Research, National Heart, Lung, and Blood InstituteNational Institutes of HealthBethesda

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