Extracellular calcium mimics the actions of platelet-derived growth factor on mouse fibroblasts.

R. J. Epstein, B. J. Druker, J. C. Irminger, S. D. Jones, T. M. Roberts, C. D. Stiles

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Microprecipitates of calcium phosphate (CaPO4) can substitute for platelet-derived growth factor (PDGF) to stimulate the growth of cultured 3T3 cells. In two-part complementation assays, CaPO4 behaves as a PDGF-like "competence factor"--that is, the mitogenic response to CaPO4 is enhanced synergistically by "progression factors" contained in platelet-poor plasma. In studies described here, we show that early cytoplasmic and intranuclear events in the mitogenic response to CaPO4 are equivalent to those induced by PDGF. However, no net increase in tyrosine kinase activity of either the PDGF-alpha or PDGF-beta receptor is seen following exposure to CaPO4. Our data suggest that calcium acts within the cell, regulating events which normally proceed from activation of PDGF receptors. Alternatively, microprecipitates of CaPO4 could act externally by activating a growth factor receptor which escapes detection with available reagents.

Original languageEnglish (US)
Pages (from-to)157-164
Number of pages8
JournalCell growth & differentiation : the molecular biology journal of the American Association for Cancer Research
Issue number3
StatePublished - Mar 1992
Externally publishedYes

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology


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