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Selective requirement for MAP kinase activation in thymocyte differentiation

Nature volume 373, pages 620–623 (1995)Cite this article

Abstract

ENGAGEMENT of the T-cell receptor (TCR) with cognate ligands provokes different outcomes depending on the developmental stage of the T cell and on the properties of the ligand. In immature thymocytes TCR stimulation may result in maturation (positive selection) or death (negative selection), whereas in mature T cells it may induce proliferation, death or unresponsiveness1–5. To investigate the different signals involved in these processes, we have analysed the role of the MAP kinase (MAPK) cascade, which is required for growth-factor-stimulated replication and for differentiation in other cell types6–9, by expressing a catalytically inactive form of MAPK kinase (MEK-1) in thymocytes, thereby blocking MAPK activation. We find that positive selection of these cells is inhibited but that negative selection and TCR-induced proliferation are unaffected. Our results indicate that the intracellular signals regulating lineage commitment in T cells parallel those in photo-receptor cell specification in Drosophila10 and vulval cell differentiation in Caenorhabditis elegans11 suggesting that general rules for cell-type specification could apply among all metazoans.

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Author notes

  1. Rony Seger

    Present address: Department of Membrane Research and Biophysics, The Weizmann Institute of Science, Rehovot, 76100, Israel

Authors and Affiliations

  1. Department of Immunology, University of Washington SL-15, Seattle, Washington, 98195, USA

    Jose Alberola-lla, Katherine A. Forbush & Roger M. Perlmutter

  2. Department of Pharmacology, University of Washington SL-15, Seattle, Washington, 98195, USA

    Rony Seger & Edwin G. Krebs

  3. Department of Biochemistry, University of Washington SL-15, Seattle, Washington, 98195, USA

    Rony Seger, Edwin G. Krebs & Roger M. Perlmutter

  4. Department of Medicine (Medical Genetics), University of Washington SL-15, Seattle, Washington, 98195, USA

    Roger M. Perlmutter

  5. Howard Hughes Medical Institute, University of Washington SL-15, Seattle, Washington, 98195, USA

    Jose Alberola-lla, Katherine A. Forbush & Roger M. Perlmutter

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  4. Edwin G. Krebs
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Alberola-lla, J., Forbush, K., Seger, R. et al. Selective requirement for MAP kinase activation in thymocyte differentiation. Nature 373, 620–623 (1995). https://doi.org/10.1038/373620a0

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