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Impedance-based Real-time Measurement of Cancer Cell Migration and Invasion
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Rab5c promotes AMAP1-PRKD2 complex formation to enhance β1 integrin recycling in EGF-induced cancer invasion

Yasuhito Onodera1, Jin-Min Nam, Ari Hashimoto

  • 1Department of Molecular Biology and 2 Department of Radiation Medicine, Hokkaido University Graduate School of Medicine, Sapporo, Japan.

The Journal of Cell Biology
|June 27, 2012
PubMed

Insights

Epidermal growth factor receptor (EGFR) signaling drives breast cancer invasion. The Arf6-AMAP1 pathway, activated by EGFR, promotes cell invasion by recycling β1 integrins.

Area of Science:

  • Cell Biology
  • Oncology
  • Molecular Biology

Background:

  • Epidermal growth factor receptor (EGFR) signaling is critical in breast cancer progression.
  • Overexpression of Arf6 and its effector AMAP1 (also known as ASAP1 or DDEF1) is common in aggressive breast cancer cells.
  • Integrin recycling is essential for cancer cell invasion and metastasis.

Purpose of the Study:

  • To elucidate the mechanism by which EGFR signaling promotes breast cancer cell invasion.
  • To investigate the role of the Arf6-AMAP1 pathway in EGFR-induced cell invasion.
  • To identify the molecular links between EGFR signaling, Arf6-AMAP1, and integrin recycling.

Main Methods:

  • Investigated the interaction between AMAP1 and β1 integrin subunits.
  • Utilized co-immunoprecipitation assays to detect protein complexes.
  • Examined the role of Rab5c activation in mediating AMAP1-PRKD2 association.
  • Studied the effect of EGFR stimulation on cell invasion.

Main Results:

  • The Arf6-AMAP1 pathway directly links to the machinery responsible for recycling β1 integrins (e.g., α3β1).
  • AMAP1 binds directly to PRKD2, forming a complex with the cytoplasmic tail of the β1 integrin subunit.
  • EGFR signaling activates GTP-Rab5c, which is necessary for the intracellular association of AMAP1 and PRKD2.

Conclusions:

  • EGFR signaling promotes breast cancer cell invasiveness through a novel mechanism involving integrin recycling.
  • The Arf6-AMAP1 pathway plays a key role in mediating EGFR-induced cell invasion by regulating β1 integrin recycling.
  • This pathway represents a potential therapeutic target for reducing breast cancer metastasis.

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