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EphB3 suppresses non-small-cell lung cancer metastasis via a PP2A/RACK1/Akt signalling complex

Guo Li1, Xiao-Dan Ji, Hong Gao

  • 1Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences and Graduate School of Chinese Academy of Sciences, Shanghai 200031, China.

Nature Communications
|February 9, 2012
PubMed

Insights

EphB3 receptor tyrosine kinase signaling suppresses non-small cell lung cancer metastasis. Activating EphB3 inhibits tumor cell migration and metastasis by reducing Akt phosphorylation.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Signaling

Background:

  • Eph receptors and their ephrin ligands play roles in cancer progression.
  • EphB3 is overexpressed in non-small cell lung cancer (NSCLC).
  • The function of EphB3 in NSCLC metastasis is not fully understood.

Purpose of the Study:

  • To investigate the role of EphB3 signaling in NSCLC metastasis.
  • To identify novel signaling pathways regulated by EphB3 in NSCLC.

Main Methods:

  • Analysis of EphB3 and ephrin expression in human NSCLC.
  • In vitro and in vivo assays to assess cell migration and metastasis.
  • Co-immunoprecipitation and Western blotting to identify EphB3-binding proteins and signaling pathways.

Main Results:

  • EphB3 ligands (ephrin-B1/B2) are downregulated in NSCLC, reducing EphB3 phosphorylation.
  • Forced EphB3 activation inhibits NSCLC cell migration and metastasis.
  • A novel EphB3-binding protein, receptor for activated C-kinase 1 (RACK1), mediates a complex with protein phosphatase 2A and Akt.
  • EphB3 activation leads to reduced Akt phosphorylation and inhibited cell migration.

Conclusions:

  • Kinase-activated EphB3 signaling acts as a tumor suppressor in NSCLC.
  • A novel EphB3-RACK1-PP2A-Akt pathway inhibits NSCLC cell migration.
  • Activating EphB3 signaling presents a potential therapeutic strategy for NSCLC metastasis.

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