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Mol. Cell. Biol., 07 1995, 3644-3653, Vol 15, No. 7
RR Vaillancourt, LE Heasley, J Zamarripa, B Storey, M Valius, A Kazlauskas and GL Johnson
When expressed in PC12 cells, the platelet-derived growth factor beta
receptor (beta PDGF-R) mediates cell differentiation. Mutational analysis
of the beta PDGF-R indicated that persistent receptor stimulation of the
Ras/Raf/mitogen-activated protein (MAP) kinase pathway alone was
insufficient to sustain PC12 cell differentiation. PDGF receptor activation
of signal pathways involving p60c-src or the persistent regulation of
phospholipase C gamma was required for PC12 cell differentiation. beta
PDGF-R regulation of phosphatidylinositol 3- kinase, the GTPase-activating
protein of Ras, and the tyrosine phosphatase, Syp, was not required for
PC12 cell differentiation. In contrast to overexpression of oncoproteins
involved in regulating the MAP kinase pathway, growth factor
receptor-mediated differentiation of PC12 cells requires the integration of
other signals with the Ras/Raf/MAP kinase pathway.
Copyright © 1995, American Society for Microbiology
Mitogen-activated protein kinase activation is insufficient for growth factor receptor-mediated PC12 cell differentiation
Division of Basic Sciences, National Jewish Center for Immunology and Respiratory Medicine, Denver, Colorado 80206, USA.
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