Divergent regulation of the murine CC chemokine C10 by Th(1) and Th(2) cytokines.

Chemokines are typically found as products of acute stimulation of host defence cells. In contrast, the mouse CC chemokine C10 was previously shown to be a delayed, stably induced product of macrophages treated with interleukin 3 (IL-3), IL-4 or GM-CSF. We investigated the possibility that C10 is differentially regulated by cytokines associated with Th(1)and Th(2)cells. Northern blot analysis of bone marrow-derived macrophages showed that, in addition to IL-4, the Th(2)-specific cytokines IL-10 and IL-13 upregulated C10 over a 48-h period in a dose-dependent manner. In contrast, MIP-1alpha and MCP-1/JE were induced by IL-3 or GM-CSF at 48 h and this induction was inhibited by IL-4. Interferon gamma, a Th(1)-specific product, abolished the induction of C10 mRNA and protein by either IL-3 or granulocyte-macrophage colony-stimulating factor (GM-CSF) in either bone marrow-derived or peritoneal macrophages. The inhibition of C10 production by interferon gamma was not NO dependent. Finally the GM-CSF-mediated induction of C10 in peritoneal macrophages was eliminated when these cells presented antigen to established T cells of Th(1)phenotype. The findings are consistent with a potential role for C10 in the modulation of immune reactions of Th(2)type. Copyright 2000 Academic Press.