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Related Experiment Videos

Iterative microarray and RNA interference-based interrogation of the SRC-induced invasive phenotype.

Rosalyn B Irby1, Renae L Malek, Greg Bloom

  • 1Department of Surgery, H. Lee Moffit Cancer Center & Research Institute, College of Medicine, University of South Florida, Tampa, Florida 33612, USA.

Cancer Research
|March 9, 2005
PubMed
Summary
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Src kinase (Src) drives colorectal cancer metastasis by regulating a gene network. Researchers identified key "first-tier" and "second-tier" genes in this Src-regulated cascade, revealing new therapeutic targets for cancer invasion.

Area of Science:

  • Molecular Oncology
  • Cancer Metastasis Research
  • Gene Regulatory Networks

Background:

  • Src kinase is implicated in colorectal cancer progression and metastasis.
  • Downstream targets and molecular pathways regulated by Src in cancer remain poorly understood.
  • Gene expression profiling identifies gene sets but often lacks pathway context.

Purpose of the Study:

  • To experimentally reconstruct a gene activity network regulated by Src kinase.
  • To identify molecular targets contributing to the invasive phenotype in colorectal cancer.
  • To elucidate the hierarchical gene regulation driven by Src activity.

Main Methods:

  • Utilized an iterative approach combining phenotypic anchoring of gene expression profiles.
  • Employed loss-of-function screening using RNA-mediated interference (RNAi).

Related Experiment Videos

  • Analyzed human colon cancer cell lines with varying Src activity and invasivity.

    • Main Results:

    • Identified two tiers of gene transcription responsible for the invasive phenotype.
    • First-tier genes are directly controlled by Src activity; second-tier genes are influenced by first-tier genes.
    • Inhibition of Src or knockdown of first/second-tier genes significantly reduced invasivity and downstream gene activity.

    Conclusions:

    • Src kinase regulates a 'transcriptional cascade' pathway critical for colorectal cancer metastasis.
    • Numerous members of this cascade have been identified and functionally validated as key regulators of invasion.
    • Targeting identified first-tier or second-tier genes represents a potential therapeutic strategy to inhibit cancer spread.