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CSF-1–induced Src signaling can instruct monocytic lineage choice

Max Endele, Dirk Loeffler, Konstantinos D. Kokkaliaris, Oliver Hilsenbeck, Stavroula Skylaki, Philipp S. Hoppe, Axel Schambach, E. Richard Stanley and Timm Schroeder

Key Points

  • SFK signaling is sufficient to mediate M fate instruction by CSF-1.

  • c-Src activity is sufficient to enforce M fate, both in myeloid progenitors and in nonmyeloid cells.

Abstract

Controlled regulation of lineage decisions is imperative for hematopoiesis. Yet, the molecular mechanisms underlying hematopoietic lineage choices are poorly defined. Colony-stimulating factor 1 (CSF-1), the cytokine acting as the principal regulator of monocyte/macrophage (M) development, has been shown to be able to instruct the lineage choice of uncommitted granulocyte M (GM) progenitors toward an M fate. However, the intracellular signaling pathways involved are unknown. CSF-1 activates a multitude of signaling pathways resulting in a pleiotropic cellular response. The precise role of individual pathways within this complex and redundant signaling network is dependent on cellular context, and is not well understood. Here, we address which CSF-1–activated pathways are involved in transmitting the lineage-instructive signal in primary bone marrow-derived GM progenitors. Although its loss is compensated for by alternative signaling activation mechanisms, Src family kinase (SFK) signaling is sufficient to transmit the CSF-1 lineage instructive signal. Moreover, c-Src activity is sufficient to drive M fate, even in nonmyeloid cells.

  • Submitted May 5, 2016.
  • Accepted January 17, 2017.
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