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Bone marrow CD34+/B220+ progenitors target the inflamed brain and display in vitro differentiation potential toward microglia
Author(s) -
Davoust N.,
Vuaillat C.,
Cavillon G.,
Domenget C.,
Hatterer E.,
Bernard A.,
Dumontel C.,
Jurdic P.,
Malcus C.,
Confavreux C.,
Belin M. F.,
Nataf S.
Publication year - 2006
Publication title -
the faseb journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.709
H-Index - 277
eISSN - 1530-6860
pISSN - 0892-6638
DOI - 10.1096/fj.05-5593com
Subject(s) - microglia , progenitor cell , cd34 , bone marrow , neuroinflammation , myeloid , immunology , biology , stem cell , microbiology and biotechnology , inflammation
Recent evidence indicates that microglial cells may not derive from blood circulating mature monocytes as they express features of myeloid progenitors. Here, we observed that a subpopulation of microglial cells expressed CD34 and B220 antigens during brain development. We thus hypothesized that microglia, or a subset of microglial cells, originate from blood circulating CD34/B220 myeloid progenitors, which could target the brain under developmental or neuroinflammatory conditions. Using experimental allergic encephalomyelitis (EAE) as a model of chronic neuroinflammation, we found that a discrete population of CD34/B220 cells expands in both blood and brain of diseased animals. In EAE mice, intravenous transfer experiments showed that macrophage‐colony stimulating factor (M‐CSF) ‐expanded CD34 myeloid progenitors target the inflamed central nervous system (CNS) while keeping their immature phenotype. Based on these results, we then assessed whether CD34/ B220 cells display in vitro differentiation potential toward microglia. For this purpose, CD34/B220 cells were sorted from M‐CSF‐stimulated bone marrow (BM) cultures and exposed to a glial cell conditioned medium. Under these experimental conditions, CD34/B220 cells were able to differentiate into microglial‐like cells showing the morphological and phenotypic features of native microglia. Overall, our data suggest that under developmental or neuroinflammatory conditions, a subpopulation of microglial cells derive from CNS‐invading CD34/B220 myeloid progenitors.—Davoust, N., Vuaillat, C., Cavillon, G., Domenget, C., Hatterer, E., Bernard, A., Dumontel, C., Jurdic, P., Malcus, C., Confavreux, C., Belin, M. F., Nataf, S. Bone marrow CD34/B220 progenitors target the inflamed brain and display in vitro differentiation potential toward microglia. FASEB J. 20, 2081–2092 (2006)