Bone marrow CD34+/B220+ progenitors target the inflamed brain and display in vitro differentiation potential toward microglia
| Autor: | Carine Vuaillat, Eric Hatterer, Arlette Bernard, Gaëlle Cavillon, Christophe Malcus, Marie-Françoise Belin, Nathalie Davoust, Serge Nataf, C. Domenget, Christian Confavreux, Pierre Jurdic, Christiane Dumontel |
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| Rok vydání: | 2006 |
| Předmět: |
Myeloid
Encephalomyelitis Autoimmune Experimental Cellular differentiation CD34 Antigens CD34 Bone Marrow Cells Biology Biochemistry Mice Cell Movement hemic and lymphatic diseases Genetics medicine Animals Cell Lineage Progenitor cell Molecular Biology Neuroinflammation Inflammation Microglia Brain Cell Differentiation Hematopoietic Stem Cells Cell biology Mice Inbred C57BL medicine.anatomical_structure Animals Newborn Immunology Leukocyte Common Antigens Female Bone marrow Stem cell Biotechnology |
| Zdroj: | FASEB journal : official publication of the Federation of American Societies for Experimental Biology. 20(12) |
| ISSN: | 1530-6860 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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