IL-2 and IL-10 Production by Human CD4+T Cells Is Differentially Regulated by p38: Mode of Stimulation-Dependent Regulation of IL-2Veiopoulou C.a · Kogopoulou O.a · Tzakos E.a · Mavrothalassitis G.c · Mitsias D.a · Karafoulidou A.b · Paliogianni F.d · Moutsopoulos H.M.a · Thyphronitis G.a
aDepartment of Pathophysiology, School of Medicine, University of Athens and bBlood Transfusion and Haemophilia Center, Laikon General Hospital, Athens, cSchool of Medicine, University of Crete and IMBB-FORTH, Heraklion, and dDepartment of Microbiology, School of Medicine, University of Patras, Patras, Greece
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Antigenic stimulation of T cells initiates a complex series of intracellular signaling pathways that target and activate different cytokine genes. The participation of mitogen-activated protein kinases (MAPKs) in these processes has not been studied thoroughly and in some instances conflicting results have been reported. Here we have examined the role of p38 MAPK on IL-2 and IL-10 production following activation of human CD4+ T cells or of the leukemic cell line Hut-78, with either plate-bound anti-CD3 in the presence or absence of soluble anti-CD28 (plCD3, plCD3/sCD28), or with cross-linked anti-CD3 and anti-CD28 (crsCD3+CD28), or with PMA plus ionomycin. Pharmacological inhibition of the p38 pathway with either SB203580, SB202190, or SKF86002 strongly downregulated IL-10 production by T cells stimulated with any of the above treatments. In contrast the effect of p38 inhibition on IL-2 was stimulus dependent. Thus, p38 inhibition strongly upregulated IL-2 production (up to 10-fold) in the plCD3- and plCD3/sCD28-stimulated cultures while it had minimal or no effect in the other two stimulation protocols. Intracellular and mRNA levels of IL-2 and IL-10 were also upregulated and downregulated, respectively, by p38 inhibitors in the plCD3/sCD28-stimulated CD4+ T cells. Also, the induction of IL-2 and the parallel suppression of IL-10 by p38 inhibitors were independent of the balance between these two cytokines, as demonstrated by the addition of exogenous IL-10 or blocking anti-IL-10 antibody in CD4+ and Hut-78 cell cultures. These results show that p38 acts as a molecular switch that changes the balance between IL-2 and IL-10. This is especially important considering the opposing role of these cytokines in peripheral immune tolerance.
© 2004 S. Karger AG, Basel
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