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- W1485498049 abstract "Abstract IL-12, a 75-kDa heterodimeric cytokine composed of two chains (p35 and p40), is a central regulator of immune responses and may be implicated in the pathogenesis of certain inflammatory diseases of the central nervous system (CNS). We have examined the capacity of two CNS APC, microglia and astrocytes, to produce IL-12 upon stimulation with cytokines, LPS, or a neurotropic virus. In purified microglial cultures from neonatal mouse brains, expression of IL-12 p35 and p40 mRNA is induced by LPS and is stimulated maximally by combined IFN-gamma/LPS treatment, as detected by semiquantitative reverse-transcriptase PCR. LPS induces secretion of IL-12 p40, but not of IL-12 p75, as detected by specific ELISA. Combined stimulation with IFN-gamma/LPS enhances IL-12 p40 secretion and induces IL-12 p75 secretion by microglia. Conversely, mouse astrocytes do not express IL-12 p35 mRNA and do not secrete IL-12 p75 under any condition tested. IL-12 production by activated microglia is inhibited by IL-10, PGE2, and cAMP-elevating agents. Coculture of microglia with astrocytes or exposure of microglia to astrocyte-conditioned medium also results in marked reduction of IL-12 p75 and p40 secretion by IFN-gamma/LPS-stimulated microglia, indicating a regulatory role of astrocytes on IL-12 production. This novel mechanism of IL-12 regulation may play an important role in the control of immune responses during infection or in Th1 cell-mediated autoimmune diseases of the CNS." @default.
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- W1485498049 date "1997-08-15" @default.
- W1485498049 modified "2023-10-06" @default.
- W1485498049 title "IL-12 production by central nervous system microglia is inhibited by astrocytes." @default.
- W1485498049 doi "https://doi.org/10.4049/jimmunol.159.4.1604" @default.
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