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The Journal of Immunology, Vol 156, Issue 12 4535-4538, Copyright © 1996 by American Association of Immunologists
CUTTING EDGE |
J Sen, R Kapeller, R Fragoso, R Sen, LI Zon and SJ Burakoff
Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA.
Thymocytes develop into mature functional T cells in the inductive environment of the thymus where thymocyte-stromal cell interactions and cytokines provide survival and differentiation signals as cues for thymocyte maturation. Disruption of the thymic microenvironment results in attenuation of T cell maturation, suggesting that intrathymic signals are essential for differentiation and repertoire selection. We have previously shown that several inducible nuclear factors such as AP- 1, NF-AT, and NF-kappaB are activated in response to intrathymic signals. Here we demonstrate that in thymocytes p38 mitogen-activated protein (MAP) kinase, a member of the MAP kinase family of proteins that include the extracellular-signal regulated kinases and Jun aminoterminal kinases, is highly activated in response to intrathymic signals in vivo. These studies suggest a role for p38 MAP kinase in T cell survival and differentiation.
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