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Related Experiment Videos

v-Src-induced transformation is inhibited by okadaic acid

R W Gupta1, C K Joseph, D A Foster

  • 1Institute for Biomolecular Structure and Function, Hunter College, City University of New York, New York 10021.

Biochemical and Biophysical Research Communications
|October 15, 1993
PubMed
Summary

Okadaic acid, a tumor promoter, inhibits protein phosphatases and reverses v-Src-induced cell transformation. This suggests serine/threonine phosphatases play a key role in cancer development.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Okadaic acid is a known tumor promoter.
  • It potently inhibits serine/threonine protein phosphatases 1 and 2A.
  • v-Src transformation induces significant changes in cell morphology and behavior.

Purpose of the Study:

  • To investigate the role of serine/threonine protein phosphatases in v-Src-induced cell transformation.
  • To determine the effects of okadaic acid on the transformed phenotype of v-Src-transformed cells.

Main Methods:

  • Treatment of v-Src-transformed BALB/c 3T3 cells with okadaic acid.
  • Assessment of cellular morphology.
  • Quantification of fibronectin levels.
  • Measurement of saturation density and colony formation in soft agar.

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  • Evaluation of cell proliferation in low serum conditions.

    • Main Results:

    • Okadaic acid treatment reverted v-Src-transformed cells to a flat morphology.
    • Increased fibronectin levels in the extracellular matrix were observed.
    • Reduced saturation density and inhibited colony formation in soft agar occurred.
    • Okadaic acid inhibited the proliferation of v-Src-transformed cells in low serum.

    Conclusions:

    • Serine/threonine protein phosphatases are implicated in v-Src-induced cell transformation.
    • Inhibition of these phosphatases by okadaic acid reverses key aspects of the transformed phenotype.
    • These findings highlight the critical role of phosphatases in oncogenic signaling pathways.