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Research Article

Mitogenic signaling by colony-stimulating factor 1 and ras is suppressed by the ets-2 DNA-binding domain and restored by myc overexpression.

S J Langer, D M Bortner, M F Roussel, C J Sherr, M C Ostrowski
S J Langer
Department of Microbiology and Immunology, Duke University Medical Center, Durham, North Carolina 27710.
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D M Bortner
Department of Microbiology and Immunology, Duke University Medical Center, Durham, North Carolina 27710.
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M F Roussel
Department of Microbiology and Immunology, Duke University Medical Center, Durham, North Carolina 27710.
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C J Sherr
Department of Microbiology and Immunology, Duke University Medical Center, Durham, North Carolina 27710.
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M C Ostrowski
Department of Microbiology and Immunology, Duke University Medical Center, Durham, North Carolina 27710.
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DOI: 10.1128/MCB.12.12.5355
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ABSTRACT

The activity of p21ras is required for the proliferative response to colony-stimulating factor 1 (CSF-1), and signals transduced by both the CSF-1 receptor (CSF-1R) and p21ras stimulate transcription from promoter elements containing overlapping binding sites for Fos/Jun- and Ets-related proteins. A sequence encoding the DNA-binding domain and nuclear localization signal of human c-ets-2, which lacked portions of the c-ets-2 gene product necessary for trans activation, was fused to the bacterial lacZ gene and expressed from an actin promoter in NIH 3T3 cells expressing either the v-ras oncogene or human CSF-1R. Nuclear expression of the Ets-LacZ protein, confirmed by histochemical staining of beta-galactosidase, inhibited the activity of ras-responsive enhancer elements and suppressed morphologic transformation by v-ras as well as CSF-1R-dependent colony formation in semisolid medium. When CSF-1R-bearing cells expressing the Ets-LacZ protein were stimulated by CSF-1, induction of c-ets-2, c-jun, and c-fos ensued, but the c-myc response was impaired. Enforced expression of the c-myc gene overrode the suppressive effect of ets-lacZ and restored the ability of these cells to form colonies in response to CSF-1. NIH 3T3 cells engineered to express a CSF-1R (Phe-809) mutant similarly cannot form CSF-1-dependent colonies in semisolid medium and exhibit an impaired c-myc response, but expression of an exogenous myc gene resensitizes these cells to CSF-1 [M. F. Roussel, J. L. Cleveland, S. A. Shurtleff, and C. J. Sherr, Nature (London) 353:361-363, 1991]. The ability of these cells to respond to CSF-1 was also rescued by enforced expression of an endogenous c-ets-2 gene. The ets family of transcription factors therefore plays a central role in integrating both CSF-1R and ras-induced mitogenic signals and in modulating the myc response to CSF-1 stimulation.

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Mitogenic signaling by colony-stimulating factor 1 and ras is suppressed by the ets-2 DNA-binding domain and restored by myc overexpression.
S J Langer, D M Bortner, M F Roussel, C J Sherr, M C Ostrowski
Molecular and Cellular Biology Dec 1992, 12 (12) 5355-5362; DOI: 10.1128/MCB.12.12.5355

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Mitogenic signaling by colony-stimulating factor 1 and ras is suppressed by the ets-2 DNA-binding domain and restored by myc overexpression.
S J Langer, D M Bortner, M F Roussel, C J Sherr, M C Ostrowski
Molecular and Cellular Biology Dec 1992, 12 (12) 5355-5362; DOI: 10.1128/MCB.12.12.5355
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