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Related Experiment Videos

Positive and negative selection invoke distinct signaling pathways

J Alberola-Ila1, K A Hogquist, K A Swan

  • 1Howard Hughes Medical Institute, Seattle, Washington, USA.

The Journal of Experimental Medicine
|July 1, 1996
PubMed
Summary
This summary is machine-generated.

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T cell development requires the mitogen-activated protein kinase (MAPK) cascade for positive selection, but not for negative selection. This pathway is essential for T cell receptor (TCR)-mediated maturation.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • T cell development in the thymus involves T cell receptor (TCR) signaling, leading to either positive selection (maturation) or negative selection (death).
  • The intracellular signaling pathways governing these distinct outcomes, particularly the role of the mitogen-activated protein kinase (MAPK) cascade, remain incompletely understood.

Purpose of the Study:

  • To investigate the specific role of the MAPK cascade in TCR-mediated positive and negative selection during T cell development.
  • To elucidate the intracellular signaling requirements for thymocyte maturation beyond the CD4+8+ stage.

Main Methods:

  • Generation of transgenic mice expressing dominant-negative Ras (dnRas) and Mek-1 (dMek) transgenes simultaneously.
  • Analysis of T cell development and selection in these mice, including peptide-specific selection using transgenic TCR models.

Related Experiment Videos

  • Assessment of negative selection via an in vitro deletion protocol.

    • Main Results:

    • Simultaneous blockade of Ras and Mek signaling (MAPK cascade inhibition) almost completely blocked thymocyte maturation beyond the CD4+8+ stage.
    • Negative selection, evaluated through in vitro deletion assays, remained quantitatively intact despite MAPK cascade blockade.
    • Generation of gamma/delta and CD4-8- alpha/beta T cells proceeded normally under MAPK cascade blockade.

    Conclusions:

    • Activation of the MAPK cascade is a necessary but not sufficient component for TCR-mediated positive selection during T cell development.
    • The MAPK pathway is dispensable for negative selection, indicating distinct signaling requirements for these two selection processes.
    • Conventional TCR-mediated repertoire selection requires MAPK pathway activation for the maturation of conventional T cells.