PMID: 9436789Jan 22, 1998Paper

Mature microglia resemble immature antigen-presenting cells

Glia
M J CarsonD Lo

Abstract

Owing to the difficulties of isolating adequate numbers of microglia from adult tissue, much of our understanding of their function is based on characterizations of microglia that develop in mixed glial cultures. To learn more about the nature of these cells in vivo, we have compared the phenotypes of murine microglia isolated from adults, neonates, and from mixed glial cultures with spleen cells from fetuses, neonates, and adults. In the adult CNS, the only resident population of cells that express CD45, a protein tyrosine phosphatase, are the F4/80+ and FcR+ cells: the microglia. In contrast to all other differentiated cells of hemopoietic origin, microglial CD45 levels fail to increase from the neonatal period through adulthood. Rather, their levels are indistinguishable from the low levels found on a small population of embryonic day 16 liver cells. Conversely, we find that the F4/80 values of microglia are elevated as compared to splenic macrophages. Strikingly, microglia that develop in mixed glial cultures display a more activated phenotype, with low F4/80 values, weak MHC class II expression, and the appearance of a subset of cells positive for the dendritic cell marker, NLDC145. Additionally, CD45 values are elevated t...Continue Reading

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