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Chemotherapeutic drugs inhibit ribosome biogenesis at various levels

Kaspar Burger1, Bastian Mühl, Thomas Harasim

  • 1Institute for Clinical Molecular Biology and Tumor Genetics, Center for Integrated Protein Science Munich (CIPSM), Germany.

The Journal of Biological Chemistry
|February 18, 2010
PubMed

Insights

Chemotherapeutic drugs target ribosome biogenesis, impacting cancer therapy efficacy. Inhibiting ribosomal RNA (rRNA) synthesis at different stages affects nucleolar integrity and drug synergism.

Area of Science:

  • Molecular Biology
  • Cancer Therapeutics
  • Cellular Biology

Background:

  • Cancer drugs have diverse chemical classes and targets.
  • The precise cellular targets of many chemotherapeutics remain unclear.
  • Ribosome biogenesis is a critical cellular process often affected by cancer therapies.

Purpose of the Study:

  • To investigate ribosome biogenesis as a target for chemotherapeutic drugs.
  • To determine the inhibitory concentrations of 36 drugs on ribosomal RNA (rRNA) synthesis and processing.
  • To explore drug synergism and the impact on nucleolar integrity.

Main Methods:

  • In vivo labeling experiments to measure rRNA transcription and processing.
  • Determination of inhibitory drug concentrations.
  • Correlation of drug effects with nucleolar integrity and assessment of drug synergism.

Main Results:

  • 36 chemotherapeutic drugs were tested for their inhibitory effects on rRNA synthesis and processing.
  • Drugs were categorized by their inhibition site: rRNA transcription, early rRNA processing, or late rRNA processing.
  • Inhibition of transcription or early processing led to nucleolar disintegration; late processing inhibition did not.
  • Flavopiridol and 5-fluorouracil demonstrated strong synergism in inhibiting rRNA processing.

Conclusions:

  • Chemotherapeutic drugs can inhibit ribosome biogenesis at various stages.
  • The level of inhibition (transcription, early vs. late processing) impacts nucleolar integrity.
  • Inhibition of ribosome biogenesis may contribute to the overall efficacy of cancer chemotherapy.

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