Coupling of Epidermal Growth Factor (EGF) with the Antiproliferative Activity of cAMP Induces Neuronal Differentiation*

Nerve growth factor (NGF) functions as a progression factor with both mitogenic and antimitogenic activities. When PC12 cells are treated with NGF, they advance to the G1stage of the cell cycle before they differentiate. The correlation between cessation of proliferation and differentiation suggests that the antimitotic activity of NGF may be obligatory for differentiation. Although epidermal growth factor- (EGF) and NGF-treated PC12 cells share several common properties, including activation of the mitogen-activated protein (MAP) kinase pathway and induction of immediate early genes, EGF is mitogenic for PC12 cells and does not normally stimulate differentiation. However, combinations of EGF and low levels of cAMP stimulate differentiation even though neither agent alone does (Mark, M. D., Liu, Y., Wong, S. T., Hinds, T. R., and Storm, D.R. (1995) J. Cell Biol. 130, 701–710). Since EGF is mitogenic for PC12 cells and differentiation may not occur until proliferation is inhibited, differentiation caused by cAMP and EGF may be due to the antiproliferative activity of cAMP. To test this hypothesis, we examined the effect of EGF or combinations of EGF and cAMP on PC12 cell proliferation. EGF alone stimulated proliferation of PC12 cells and increased the levels of several cell cycle progression factors including cdk2, cdk4, and cyclin B1. Cyclic AMP inhibited the EGF-stimulated increases in cell cycle progression factors as well as proliferation. Other antiproliferative agents including rapamycin, mimosine, and nitric oxide agonists also synergized with EGF to stimulate differentiation. These data indicate that the coupling of antiproliferative signals with EGF modifies the biological properties of EGF and converts it to a differentiating growth factor.

• Publication year

  1997

• Venue

  Journal of Biological Chemistry

• Publication date

  1997-07-04

• Fields of study

  Biology, Medicine

• Identifiers
  DOI 10.1074/jbc.272.27.17238PMID 9202048
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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