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Light-mediated Reversible Modulation of the Mitogen-activated Protein Kinase Pathway during Cell Differentiation and Xenopus Embryonic Development
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Promigratory and procontractile growth factor environments differentially regulate cell morphogenesis.

Sangmyung Rhee1, Chin-Han Ho, Frederick Grinnell

  • 1Department of Life Science, Chung-Ang University, Seoul, South Korea.

Experimental Cell Research
|October 3, 2009
PubMed
Summary
This summary is machine-generated.

Human fibroblasts in 3D collagen matrices exhibit distinct behaviors based on growth factors. Serum promotes clustering via cell contraction, while platelet-derived growth factor (PDGF) encourages individual migration.

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Area of Science:

  • Cell biology
  • Biomechanics
  • Tissue engineering

Background:

  • Three-dimensional (3D) cell-matrix cultures are vital for studying cell-matrix interactions and morphogenesis.
  • Understanding how growth factors influence cell behavior in 3D environments is crucial for tissue development and disease modeling.

Purpose of the Study:

  • To investigate the effects of serum and specific growth factors on human fibroblast behavior in 3D collagen matrices.
  • To elucidate the mechanisms underlying serum-induced cell clustering and contrast it with growth factor-mediated cell migration.

Main Methods:

  • Culturing human fibroblasts on 3D collagen matrices.
  • Treating cells with serum or platelet-derived growth factor (PDGF).
  • Assessing cell morphology, migration patterns, and the role of signaling pathways (Rho kinase, myosin II) and specific molecules (lysophosphatidic acid).

Main Results:

  • Fibroblasts in serum contracted into clusters, dependent on lysophosphatidic acid and cell contraction (inhibited by Rho kinase/myosin II inhibitors).
  • Fibroblasts in PDGF migrated as individuals.
  • Serum-induced clustering was reversed by switching to PDGF.
  • Oncogenic Ras-transformed fibroblasts did not show serum-stimulated clustering.

Conclusions:

  • Cellular responses in 3D matrices are highly dependent on the specific growth factor environment.
  • Serum promotes cell clustering through a contractile mechanism, whereas PDGF promotes individual cell migration.
  • Differential regulation of cell motility and morphogenesis is driven by cell-specific growth factor signaling.