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Autoimmunity/Diabetes Group, John P. Robarts Research Institute, London, Ontario, Canada; and Departments of
Microbiology and Immunology and
Medicine, University of Western Ontario, London, Ontario, Canada
Optimal T cell activation requires two signals, one generated by
TCR and another by the CD28 costimulatory receptor. In this study, we
investigated the regulation of costimulation-induced mitogen-activated
protein kinase (MAPK) activation in primary mouse T cells. In contrast
to that reported for human Jurkat T cells, we found that p38 MAPK, but
not Jun NH2-terminal kinase (JNK), is weakly activated upon
stimulation with either anti-CD3 or anti-CD28 in murine
thymocytes and splenic T cells. However, p38 MAPK is activated strongly
and synergistically by either CD3/CD28 coligation or
PMA/Ca2+ ionophore stimulation, which mimics
TCR-CD3/CD28-mediated signaling. Activation of p38 MAPK correlates
closely with the stimulation of T cell proliferation. In contrast,
PMA-induced JNK activation is inhibited by Ca2+ ionophore.
T cell proliferation and production of IL-2, IL-4, and IFN-
induced
by both CD3 and CD3/CD28 ligation and the nuclear expression of the
c-Jun and ATF-2 proteins are each blocked by the p38 MAPK inhibitor
SB203580. Our findings demonstrate that p38 MAPK 1) plays an important
role in signal integration during costimulation of primary mouse T
cells, 2) may be involved in the induction of c-Jun activation and
augmentation of AP-1 transcriptional activity, and 3) regulates whether
T cells enter a state of functional
unresponsiveness.
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