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RACK1 inhibits the serum- and anchorage-independent growth of v-Src transformed cells

Vidya Mamidipudi1, Betty Y Chang, Rachel A Harte

  • 1Department of Medicine, Stanford University, Stanford, CA 94305, USA.

FEBS Letters
|June 5, 2004
PubMed

Insights

Receptor for activated C kinase 1 (RACK1) partially reverses cancer cell transformation by inhibiting oncogenic Src tyrosine kinase activity. Overexpression of RACK1 in v-Src cells reduces their growth and alters cell structure.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Cancer cells exhibit uncontrolled growth (serum- and anchorage-independent) and can form foci on normal cells.
  • Previous research indicated Receptor for activated C kinase 1 (RACK1) inhibits c-Src kinase activity and NIH3T3 cell growth.

Purpose of the Study:

  • To investigate the effect of RACK1 on v-Src kinase activity and the transformed phenotype of v-Src-transformed cells.
  • To determine if RACK1 acts as an endogenous inhibitor of oncogenic Src tyrosine kinase and cell transformation.

Main Methods:

  • Overexpression of RACK1 in v-Src transformed cells.
  • Assessing v-Src kinase activity.
  • Evaluating serum- and anchorage-independent growth.
  • Observing focus formation on cell monolayers.
  • Analyzing podosome structures in RACK1-overexpressing cells.

Main Results:

  • RACK1 partially inhibits v-Src kinase activity.
  • RACK1 partially suppresses serum- and anchorage-independent growth of v-Src transformed cells.
  • RACK1 overexpression leads to the disassembly of podosomes in v-Src cells.
  • RACK1 did not affect focus formation by v-Src transformed cells.

Conclusions:

  • RACK1 overexpression partially reverses the transformed phenotype in v-Src cells.
  • RACK1 functions as an endogenous inhibitor of oncogenic Src tyrosine kinase and cell transformation.

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