PMID: 8613697Apr 1, 1996Paper

Immunoregulation by interleukin-12

Journal of Leukocyte Biology
G Trinchieri, F Gerosa

Abstract

Interleukin-12 (IL-12) is a heterodimeric cytokine produced primarily by antigen-presenting cells (monocytes, macrophages, dendritic cells, and B cells). Its production is stimulated by bacteria, bacterial products, and intracellular parasites and enhanced by priming with granulocyte-macrophage colony-stimulating factor (CM-CSF) and interferon-gamma (IFN-gamma) or inhibited by IL-10. The major biological activity of IL-12 is on T and natural killer (NK) cells in which it increases cytokine production, proliferation, and cytotoxicity. Its production occurs several hours after exposure to infections agents, which induces a rapid production of IFN-gamma by NK and later by T cells. This IFN-gamma potentiates antigen-presenting cell functions important in clearing infections agents (phagocytosis, oxidative burst, and production of nitrous oxide) and also increases further production of IL-12. IL-12 has been clearly demonstrated to be important in the generation of CD4 and CD8 type 1 T cells both in vivo and in vitro. Our data reveals that IL-12 primes naive T cells for high IFN-gamma and IL-10 production, whereas IL-4 is required for IL-4 priming, thus suggesting that these genes and possibly others are independently regulated. IL-1...Continue Reading

Citations

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