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The Journal of Immunology, Vol 159, Issue 2 846-852, Copyright © 1997 by American Association of Immunologists

ARTICLES

IL-4 and IL-10 modulation of CD40-mediated signaling of monocyte IL- 1beta synthesis and rescue from apoptosis

JC Poe, DH Wagner Jr, RW Miller, RD Stout and J Suttles
Department of Biochemistry, James H. Quillen College of Medicine, East Tennessee State University, Johnson City 37614, USA.

Previous studies have demonstrated that the interaction of CD40 on monocytes with CD40 ligand, present on activated CD4+ T cells, induces monocyte inflammatory cytokine synthesis and rescues monocytes from apoptosis. These findings suggest a role for CD40 signaling of monocyte activation in the maintenance and/or exacerbation of nonseptic (e.g., autoimmune) inflammatory responses. In the present study the effects of the modulatory cytokines IL-4 and IL-10 on CD40-mediated signaling of monocyte IL-1beta synthesis and rescue from apoptosis were examined. Both IL-4 and IL-10 decreased CD40-dependent IL-1beta synthesis in a dose-dependent manner individually and synergized in this effect when used concurrently, with minimal effect on CD40 surface expression. CD40 signaling of IL-1beta synthesis was shown to be dependent on the induction of protein tyrosine kinase (PTK) activity, and both IL-4 and IL-10 diminished CD40-mediated tyrosine phosphorylation of monocyte cellular proteins. However, IL-4, but not IL-10, blocked CD40-mediated rescue from apoptosis, an event that we have demonstrated previously to be dependent on PTK activity as well. Together these results suggest that in monocytes 1) both IL-4 and IL-10 target CD40-induced PTK activity in the down-regulation of IL-1beta synthesis; and 2) IL-4 and IL-10 have divergent effects on the CD40 signaling pathway, in that these cytokines are synergistic with respect to their abilities to inhibit CD40-mediated IL-1beta synthesis and differ in their abilities to block CD40-mediated rescue from apoptosis.


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