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The small Gtpase ras is involved in growth factor-regulated expression of the alpha1 integrin subunit in PC12 cells

K Danker1, N Mechai, L Lucka

  • 1Institut für Molekularbiologie und Biochemie, Freie Universität Berlin, Germany

Biological Chemistry
|August 15, 2001
PubMed

Insights

Epidermal Growth Factor (EGF) and Nerve Growth Factor (NGF) upregulate alpha1 integrin expression and collagen adhesion in PC12 cells. This process requires active Ras signaling, as dominant-negative RasN17 blocks these effects.

Area of Science:

  • Cell biology
  • Molecular signaling
  • Neuroscience

Background:

  • PC12 cells are a model system for studying neuronal differentiation and proliferation.
  • Growth factors like EGF and NGF signal through tyrosine receptor kinases.
  • Ras GTPase and integrin-mediated cell-matrix interactions are crucial in growth factor signaling.

Purpose of the Study:

  • To investigate the role of Ras in growth factor-induced alpha1 integrin expression and function in PC12 cells.
  • To determine how EGF and NGF affect alpha1 integrin expression in wild-type and RasN17-mutant PC12 cells.

Main Methods:

  • PC12 wild-type and RasN17 cells were treated with EGF and NGF.
  • Alpha1 integrin subunit expression was analyzed.
  • Cell surface expression of alpha1beta1 integrin was assessed.
  • Alpha1beta1-specific adhesion to collagen was measured.

Main Results:

  • EGF and NGF upregulated alpha1 integrin expression and cell surface alpha1beta1 integrin in PC12 wild-type cells.
  • Growth factor treatment enhanced alpha1beta1 integrin-specific adhesion to collagen.
  • In RasN17 cells, alpha1 integrin expression and collagen adhesion were not affected by EGF or NGF.

Conclusions:

  • Ras signaling is essential for growth factor-induced alpha1 integrin expression and alpha1beta1 integrin-mediated cell adhesion in PC12 cells.
  • These findings highlight the interplay between growth factor pathways, Ras, and integrin-ECM interactions in regulating cell behavior.

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