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• W2048183719 startingPage "190" @default.
• W2048183719 abstract "In mixed glial cell cultures from cerebral cortices of newborn rats, endotoxin induces inducible nitric oxide (iNOS), nitric oxide (NO), and interleukin-1β (IL-1β) production in microglial cells. Earlier we demonstrated that endotoxin induced iNOS but not IL-1β expression in microglial cells is inhibited by the presence of astroglial cells. In the present paper we describe studies on the mechanism by which astroglial cells exert selective suppressive action on iNOS expression by microglial cells. Expression of iNOS and IL-1β was studied by single or double label immunocytochemical techniques and cell identification was performed with GSA-I-B4-isolectin and an antibody against GFAP. Production of IL-1β and NO was determined by measurement of IL-1β and nitrite concentrations in cell lysates and the culture medium, respectively. TGFβ, a cytokine known to inhibit NO production by endotoxin challenged macrophages, was measured in culture medium of mixed glial cell cultures using a bioassay. Microglial, astroglial, and mixed glial cell cultures produced similar concentrations of TGFβ. The potential effect of TGFβ was studied by using immunoneutralizing antibodies against TGFβ1 and TGFβ2 on the induction of iNOS in microglial cells in the presence of astroglial cells. Incubation of the mixed glial cell culture with these TGFβ antibodies (3 μg/ml) markedly increased endotoxin-induced NO production and iNOS expression in microglial cells, whereas the production of IL-1β was not affected. The antibodies against TGFβ1 and TGFβ2 marginally increased NO production in pure microglial cell cultures, nonetheless in cultures of purified microglial cells recombinant TGFβ1 and TGFβ2 together with endotoxin inhibited NO production. We conclude that the presence of astroglial cells is essential for the inhibitory effect of TGFβ on NO production by microglial cells (possibly) by activation of TGFβ or by increasing the sensitivity of microglial cells for TGFβ. GLIA 19:190–198, 1997. © 1997 Wiley-Liss, Inc." @default.
• W2048183719 created "2016-06-24" @default.
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• W2048183719 date "1997-03-01" @default.
• W2048183719 modified "2023-09-27" @default.
• W2048183719 title "Inhibition of endotoxin-induced nitric oxide synthase production in microglial cells by the presence of astroglial cells: A role for transforming growth factor ?" @default.
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• W2048183719 doi "https://doi.org/10.1002/(sici)1098-1136(199703)19:3<190::aid-glia2>3.0.co;2-3" @default.
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