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Related Experiment Videos

Interactions between growth factors and gap junctional communication in developing systems.

A Warner1

  • 1Department of Anatomy and Developmental Biology, University College London, UK.

Novartis Foundation Symposium
|April 20, 1999
PubMed
Summary

Fibroblast growth factor (FGF) 4 regulates limb development by controlling gap junction communication in posterior mesenchyme cells. This signaling pathway is crucial for digit pattern formation and overall limb development.

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Area of Science:

  • Developmental Biology
  • Cell Signaling
  • Molecular Biology

Background:

  • Vertebrate limb bud development involves fibroblast growth factor (FGF) 4, secreted by the apical ectodermal ridge, controlling digit patterning.
  • FGF4 influences gap junction expression in the limb, with connexin 32 (Cx32) and connexin 43 (Cx43) present in chick and mouse mesenchyme.
  • Gap junctions form gradients within the limb bud, with highest density in the posterior polarizing region.

Purpose of the Study:

  • To investigate the role of FGF4 in modulating gap junctional communication in limb mesenchyme.
  • To determine the sensitivity of gap junctions in posterior versus anterior mesenchyme to FGF4.
  • To assess the impact of FGF4 on gap junction density, intercellular communication, and polarizing capacity.

Main Methods:

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  • Utilized micromass cultures of chick and mouse posterior and anterior mesenchyme cells.
  • Quantitatively analyzed gap junction expression and density.
  • Assessed intercellular communication and polarizing capacity in response to FGF4 treatment.

Main Results:

  • Posterior mesenchyme cells exhibited FGF4-sensitive gap junctions, while anterior mesenchyme cells showed insensitivity.
  • FGF4 treatment doubled gap junction density and intercellular communication in posterior mesenchyme cells.
  • FGF4 restored the polarizing capacity of posterior mesenchyme cells to in vivo levels.

Conclusions:

  • Gap junctional communication and polarizing capacity are intrinsically linked in limb development.
  • FGF4 plays a critical role in regulating gap junction function in the posterior limb bud.
  • Interactions between signaling molecules like FGF4 and junctional communication are vital for controlling developmental processes.