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The F-BAR protein PACSIN2 regulates epidermal growth factor receptor internalization

Bart-Jan de Kreuk1, Eloise C Anthony, Dirk Geerts

  • 1Department of Molecular Cell Biology, Sanquin Research and Landsteiner Laboratory, Academic Medical Center, University of Amsterdam, Plesmanlaan 125, 1066CX Amsterdam, The Netherlands.

The Journal of Biological Chemistry
|November 7, 2012
PubMed

Insights

The F-BAR protein PACSIN2 regulates epidermal growth factor (EGF) receptor signaling by controlling its cell surface levels. Loss of PACSIN2 enhances EGF receptor signaling and cell proliferation, revealing a novel regulatory role.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Growth factor receptor signaling, including the epidermal growth factor (EGF) receptor, is vital for cellular functions like proliferation and survival.
  • Aberrant signaling of growth factor receptors is implicated in human diseases, particularly cancer.
  • Intracellular trafficking and cell surface expression levels critically determine growth factor receptor signaling outcomes.

Purpose of the Study:

  • To investigate the role of the F-BAR protein PACSIN2 in the regulation of EGF receptor signaling.
  • To elucidate how PACSIN2 influences the trafficking and cell surface expression of the EGF receptor.

Main Methods:

  • Immunofluorescence microscopy to track EGF and EGF receptor localization.
  • Western blotting to assess EGF receptor phosphorylation and downstream signaling.
  • Cellular assays to measure cell proliferation and Erk/Akt activation.
  • Depletion of PACSIN2 using siRNA or other gene silencing techniques.

Main Results:

  • Internalized EGF and activated EGF receptor were found to localize to PACSIN2-positive endosomes.
  • Loss of PACSIN2 led to increased plasma membrane expression of the EGF receptor in resting cells.
  • PACSIN2 depletion enhanced EGF-induced EGF receptor phosphorylation, Erk and Akt activation, and cell proliferation.

Conclusions:

  • PACSIN2 plays a novel role in regulating the cell surface levels of the EGF receptor.
  • PACSIN2 influences EGF-induced downstream signaling pathways, impacting cell proliferation.
  • Targeting PACSIN2 could offer a strategy for modulating EGF receptor signaling in disease contexts.

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