Abstract
In an autoimmune inflammatory setting, ingestion of apoptotic T cells leads to a down-regulation of microglial immune functions. Recent studies have indicated that microglia can be matured by exposure to GM-CSF. GM-CSF stimulation led to a differentiated microglial phenotype and enhanced antigen-presenting capabilities. The secretion of TNF-α was significantly decreased by the uptake of apoptotic cells in unstimulated microglia, but not in GM-CSF-differentiated microglia. IL-10 secretion was unaffected. After ingestion of apoptotic cells, only previously unstimulated, but not GM-CSF-differentiated microglial cells decreased their T cell-activating potential as measured by IFN-γ secretion in antigen-activated MBP-specific T cells. Thus, GM-CSF stimulation reduces the immunomodulatory functions of microglial cells.
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