Interleukin-12 is produced by dendritic cells and mediates T helper 1 development as well as interferon-gamma production by T helper 1 cells

European Journal of Immunology
C HeuflerG Schuler

Abstract

Interleukin-12 (IL-12), a 70-kDa heterodimeric cytokine composed of covalently linked p35 and p40 chains, is to date the most critical factor for skewing the immune response towards a T helper 1 (Th1) of cytokine profile [high interferon-gamma (IFN-gamma), low IL-4]. Established sources of IL-12 are stimulated macrophages, neutrophils and B cells. As dendritic cells (DC) process antigen in the periphery and then migrate to lymphoid organs to sensitize T cells and induce cell mediated immunity, we reasoned that DC should constitute a critical source of IL-12. The criteria used to detect IL-12 in DC were the demonstration of p40 and p35 mRNA (semiquantitative polymerase chain reaction, northern blotting, and in situ hybridization) as well as IL-12 protein (p70 enzyme-linked immunosorbent assay, p70 antigen capture followed by IFN-gamma bioassay, free p40 chain radioimmunoassay or immunoprecipitation). We found that conventional stimuli such as Staphylococcus aureus induced production of IL-12 by murine as well as human DC in amounts comparable to spleen cells, peritoneal macrophages or peripheral mononuclear cells. DC exhibited, however, features that had not been seen with other antigen-presenting cells: they produced bioactive ...Continue Reading

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