Abstract
Macrophage colony-stimulating factor (M-CSF) influences the proliferation and survival of mononuclear phagocytes through the receptor CSF-1R. The adaptor protein DAP12 is critical for the function of mononuclear phagocytes. DAP12-mutant mice and humans have defects in osteoclasts and microglia, as well as brain and bone abnormalities. Here we show DAP12 deficiency impaired the M-CSF-induced proliferation and survival of macrophages in vitro. DAP12-deficient mice had fewer microglia in defined central nervous system areas, and DAP12-deficient progenitors regenerated myeloid cells inefficiently after bone marrow transplantation. Signaling by M-CSF through CSF-1R induced the stabilization and nuclear translocation of β-catenin, which activated genes involved in the cell cycle. DAP12 was essential for phosphorylation and nuclear accumulation of β-catenin. Our results provide a mechanistic explanation for the many defects of DAP12-deficient mononuclear phagocytes.
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Acknowledgements
We thank D.M. Ornitz (Washington University School of Medicine) for the LEF-luc-pGL3 reporter plasmid; H.S. Earp III (University of North Carolina, Chapel Hill) for the plasmid encoding CRNK; T. Rolink (University of Basel) for IgM anti-CD4 and IgM anti-CD8; S. Gilfillan for critical reading of the manuscript; C. Laudanna and B. Rossi for advice on cell adhesion experiments; and Pfizer for the Pyk2 inhibitor PF 431396. Supported by the US National Institutes of Health (R01 GM077279 to M.C. and U54 AI1057160 to S.L.S.), Nobel Project Fondazione Cariplo (W.V.) and Fondazione Nocivelli (P.L.P.).
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K.O. and I.R.T. designed and did experiments; P.L.P., W.V., T.A. and M.M. did and interpreted immunohistochemistry experiments; E.C., I.T. and A.S.S. did and interpreted adhesion assays and confocal microscopy studies; S.L.S. and T.T. provided reagents and expression data; and M.C. directed the research and wrote the paper.
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Otero, K., Turnbull, I., Poliani, P. et al. Macrophage colony-stimulating factor induces the proliferation and survival of macrophages via a pathway involving DAP12 and β-catenin. Nat Immunol 10, 734–743 (2009). https://doi.org/10.1038/ni.1744
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DOI: https://doi.org/10.1038/ni.1744
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