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Related Experiment Videos

Keratinocyte growth factor

J S Rubin1, D P Bottaro, M Chedid

  • 1Laboratory of Cellular and Molecular Biology, National Cancer Institute, Bethesda, MD 20892, USA.

Cell Biology International
|May 1, 1995
PubMed
Summary
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Keratinocyte growth factor (KGF) primarily acts on epithelial cells, originating from mesenchymal cells. This paracrine signaling pathway is crucial for epithelial cell proliferation, migration, and morphogenesis.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Developmental Biology

Background:

  • Keratinocyte growth factor (KGF), also known as fibroblast growth factor-7 (FGF-7), is part of the heparin-binding fibroblast growth factor family.
  • KGF exhibits specific target-cell activity, primarily affecting epithelial cells.
  • KGF is produced by mesenchymal cells, suggesting a role in paracrine signaling between mesenchymal and epithelial tissues.

Purpose of the Study:

  • To investigate the cellular origin and target specificity of Keratinocyte Growth Factor (KGF).
  • To elucidate the molecular identity of the KGF receptor (KGFR).
  • To confirm the role of KGF in mediating mesenchymal-epithelial communication and its effects on epithelial cells.

Main Methods:

  • Cell culture studies to assess KGF mitogenic activity.

Related Experiment Videos

  • Biochemical analysis and molecular cloning to identify the KGF receptor.
  • Expression analysis in whole tissues and cell lines.
  • Functional assays in organ culture and in vivo models.
  • Studies on KGF regulation by sex steroid hormones.

    • Main Results:

    • KGF demonstrated mitogenic activity exclusively on epithelial cells from various tissues.
    • KGF is produced solely by mesenchymal cells, supporting its role as a paracrine mediator.
    • The KGF receptor (KGFR) was identified as a tyrosine kinase isoform encoded by the fgfr-2 gene.
    • Expression patterns confirmed the mesenchymal origin and epithelial target of KGF.
    • KGF elicits epithelial cell proliferation, migration, and morphogenesis in vitro and in vivo.

    Conclusions:

    • KGF functions as a critical paracrine factor produced by mesenchymal cells that stimulates epithelial cell responses.
    • The KGF-KGFR signaling pathway is essential for epithelial cell behavior, including growth, movement, and structural development.
    • KGF's activity is regulated and plays a significant role in tissue homeostasis and development, potentially influenced by hormonal factors.