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Function of FGF-4 in limb development

L Niswander1, C Tickle, A Vogel

  • 1Department of Anatomy and Developmental Biology, University of California, San Francisco.

Molecular Reproduction and Development
|September 1, 1994
PubMed
Summary
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Fibroblast growth factor-4 (FGF-4) protein can fully substitute for the apical ectodermal ridge (AER) in chick limb development. FGF-4 can rescue limb outgrowth and patterning after AER removal, demonstrating its crucial role.

Area of Science:

  • Developmental Biology
  • Molecular Biology
  • Regenerative Medicine

Background:

  • The apical ectodermal ridge (AER) is crucial for limb development, regulating mesenchyme proliferation and patterning.
  • AER removal causes limb truncation, halting outgrowth along the proximo-distal axis.
  • The AER maintains the progress zone mesenchyme and the polarizing region, essential for limb patterning.

Purpose of the Study:

  • To investigate the role of fibroblast growth factor-4 (FGF-4) in limb development.
  • To determine if FGF-4 can functionally replace the AER in supporting limb outgrowth and patterning.

Main Methods:

  • Experiments were conducted on developing chick limbs in ovo.
  • The apical ectodermal ridge (AER) was surgically removed.

Related Experiment Videos

  • Fibroblast growth factor-4 (FGF-4) protein was applied to compensate for AER removal.

    • Main Results:

    • Fibroblast growth factor-4 (FGF-4) protein was found to be expressed in the AER.
    • FGF-4 protein can stimulate limb mesenchyme proliferation and induce downstream gene expression (Evx-1).
    • Application of FGF-4 protein after AER removal resulted in virtually normal limb outgrowth and patterning.

    Conclusions:

    • Fibroblast growth factor-4 (FGF-4) can fully substitute for the apical ectodermal ridge (AER) in supporting chick limb development.
    • FGF-4 provides the necessary signals for limb outgrowth and patterning after AER removal.
    • These findings highlight FGF-4 as a key signaling molecule in limb morphogenesis.