The Journal of Immunology, Vol 159, Issue 11 5309-5317, Copyright © 1997 by American Association of Immunologists

ARTICLES

The p38 mitogen-activated protein kinase is activated by ligation of the T or B lymphocyte antigen receptors, Fas or CD40, but suppression of kinase activity does not inhibit apoptosis induced by antigen receptors

RA Salmon, IN Foltz, PR Young and JW Schrader
The Biomedical Research Centre, University of British Columbia, Vancouver, Canada.

We have investigated the activation of the p38 mitogen-activated protein kinase (MAPK) in normal mouse T and B cells and its role in apoptosis. Cross-linking of the CD3 chains of the TCR complex on proliferating T cells resulted in activation of p38 MAPK and MAPKAP kinase-2. Cross-linking of CD28 failed to activate p38 MAPK or MAPKAP kinase-2, but synergized strongly with low doses of anti-CD3. Cross- linking of Fas on T cells also induced rapid activation of p38 MAPK and MAPKAP kinase-2. The in vivo activation of MAPKAP kinase-2 in response to cross-linking of CD3, Fas, or CD3 and CD28 was shown to be dependent on p38 MAPK activity using a specific inhibitor, SB 203580. SB 203580 did not inhibit activation-induced cell death in T cells when used at concentrations that suppressed activation of MAPKAP kinase-2 in vivo. Cross-linking of the B cell Ag receptor (BCR) or CD40 on freshly isolated or LPS-activated splenic B cells or the immature B lymphoma, WEHI 231, resulted in activation of p38 MAPK and MAPKAP kinase-2. In vivo inhibition of p38 MAPK activity in WEHI 231 cells by SB 203580 had no effect on either BCR-induced apoptosis or anti-CD40-mediated suppression of apoptosis. We conclude that the activation of p38 MAPK and MAPKAP kinase-2 by cross-linking of the TCR, BCR, Fas, or CD40 was not correlated with their roles in regulating lymphocyte survival, and that suppression of kinase activity did not inhibit the induction of apoptosis.

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