Cell Growth & Differentiation, Vol 6, Issue 6 631-645, Copyright © 1995 by American Association of Cancer Research

ARTICLES

Uncoupling of the proliferation and differentiation signals mediated by the murine macrophage colony-stimulating factor receptor expressed in myeloid FDC-P1 cells

RP Bourette, GM Myles, K Carlberg, AR Chen and LR Rohrschneider
Division of Basic Sciences, Fred Hutchinson Cancer Research Center, Seattle, Washington 98104, USA.

The macrophage colony-stimulating factor (M-CSF) regulates proliferation and differentiation of cells belonging to the monocytic lineage. We have investigated the nature and origin of the proliferation and differentiation signals derived from the M-CSF receptor (Fms) by mutating Fms at the four tyrosine autophosphorylation sites and examining their biological effects in an FDC-P1 clone. Wild-type Fms stimulated both growth and differentiation of FDC-P1 cells in response to M-CSF stimulation. In contrast, both proliferation and differentiation were differentially disrupted by mutations affecting the four tyrosine autophosphorylation sites. These analyses revealed that: (a) none of the four autophosphorylation sites studied (Y697, Y706, Y721, and Y807) were essential for M-CSF-dependent proliferation of the FDC-P1 clone; (b) Y697, Y706, and Y721 sites, located in the kinase insert region of Fms, were not necessary for differentiation, but their presence augmented this process; (c) mutation of the Y807 site totally abrogated the differentiation of the FDC-P1 clone and simultaneously increased the rate of M-CSF-dependent proliferation; and (d) conversely, increasing the intracellular cAMP level blocked the growth signal in the FDC-P1 clone but had no effect on differentiation. These results suggest that autophosphorylation of Fms at the Y807 site controls the balance between signals for growth and differentiation.

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