Fibroblast growth factor-2 stimulates embryonic cardiac mesenchymal cell proliferation

Michael Choy, Sharon L. Oltjen, Yvonne S. Otani, Margaret T. Armstrong, Peter B. Armstrong

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


The proliferation response of stage 36 chick atrioventricular valve mesenchymal cells to fibroblast growth factor-2 (FGF-2) was studied in the tissue-like environment of three-dimensional cell aggregates maintained in organ culture. The mitogenic effects of FGF-2 on mesenchymal tissue depended on the FGF-2-stimulated formation of a fibronectin-containing extracellular matrix. The matrix was absent in unstimulated aggregates, and co-localized with regions of actively proliferating cells in stimulated aggregates. Inhibition of fibronectin matrix formation by the inclusion of Arg-Gly-Asp- containing peptides, which compete with fibronectin for binding to the cell surface α5β1 integrin receptors, abolished the proliferation effects of FGF-2. Inhibition of sulfation of cell surface glycosaminoglycans by treatment with sodium chlorate significantly reduced both the formation of the fibronectin matrix and cell proliferation in response to FGF-2, suggesting an involvement of the low-affinity sulfated glycosaminoglycan FGF receptor system. Thus, the FGF-stimulated growth of embryonic atrioventricular valve mesenchyme in vitro involves the production of a fibronectin matrix. We suggest that the stimulation of the fibronectin matrix represents an essential element in growth factor signaling of mesenchymal tissue, with the matrix serving as an anchorage substratum for the proliferating cells.

Original languageEnglish (US)
Pages (from-to)193-200
Number of pages8
JournalDevelopmental Dynamics
Issue number2
StatePublished - Jun 1996


  • Anchorage dependence
  • Atrioventricular valves
  • Cardiac development
  • Cell proliferation
  • Chick
  • Endocardial cushions
  • Extracellular matrix
  • Fibronectin
  • Heparan sulfate proteoglycan
  • High-affinity receptor
  • Low-affinity receptor
  • Mesenchymal cells

ASJC Scopus subject areas

  • Developmental Biology
  • Cell Biology


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