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Related Experiment Videos

Complexity, retinoid-responsive gene networks, and bladder carcinogenesis.

R E Hurst1, P Waliszewski, M Waliszewska

  • 1Department of Urology, University of Oklahoma Health Sciences Center, Oklahoma City 73190, USA.

Advances in Experimental Medicine and Biology
|December 22, 1999
PubMed
Summary

Retinoid signaling, crucial for cell control, is disrupted in bladder cancer. This study reveals complex gene expression changes and mutations in retinoid receptors, suggesting retinoid pathway inactivation is common in bladder carcinogenesis.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Carcinogenesis involves dysregulation of cell proliferation, differentiation, and apoptosis.
  • Retinoid signaling, mediated by nuclear receptors like human Retinoic Acid Receptor alpha (hRARα), is a key regulatory system.
  • The complex network of retinoid-responsive genes challenges simple cause-effect interpretations of hRARα's role.

Purpose of the Study:

  • To investigate the complexity of the retinoid-responsive gene network in bladder cancer.
  • To model bladder tumorigenesis using a panel of bladder-derived cell lines representing various stages.
  • To determine the functional consequences of retinoid signaling alterations on cell proliferation and apoptosis.

Main Methods:

  • Utilized a panel of bladder cell lines (immortalized, papilloma, and transitional cell carcinomas) to model bladder cancer progression.

Related Experiment Videos

  • Measured relative gene expression of retinoid receptors, metabolism/action genes, and signaling genes before and after all-trans-retinoic acid (aTRA) treatment.
  • Assessed phenotypic responses (proliferation inhibition, apoptosis) to aTRA and 4-HPR, and evaluated retinoid-responsive element (RARE)-dependent transactivation via CAT reporter assays.

    • Main Results:

    • Observed wide variations in constitutive and aTRA-stimulated gene expression among cell lines, defying simple models.
    • Demonstrated differential responses to retinoids regarding proliferation inhibition and apoptosis, with no clear correlation to single gene expression.
    • Identified a mutation in the hRARα gene in one cell line (HUC-BC), potentially affecting receptor function.

    Conclusions:

    • Retinoid signaling exhibits complex, non-linear behavior in bladder cancer cells.
    • Simple interpretations of hRARα gene transcription as the sole regulatory event are insufficient.
    • Inactivation of the retinoid signaling pathway is likely a frequent event in bladder carcinogenesis.