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Quantitative Analysis of Autophagy using Advanced 3D Fluorescence Microscopy
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Non-coding rRNA-mediated preferential killing in cancer cells is enhanced by suppression of autophagy in

C J Hwang1, J R Fields, Y-H Shiao

  • 1Laboratory of Comparative Carcinogenesis, National Cancer Institute at Frederick, Frederick, MD, USA.

Cell Death & Disease
|December 14, 2011
PubMed

Insights

Anticancer agents targeting rRNA biogenesis show promise. Anti-antisense oligonucleotides stabilize non-coding RNAs, preferentially killing cancer cells by disrupting rRNA production, offering a new therapeutic strategy.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Drug Discovery

Background:

  • Growing interest in targeting ribosomal RNA (rRNA) biogenesis for anticancer therapies.
  • Discovery of cis-non-coding rRNAs as regulators of rRNA biogenesis.
  • Identification of bidirectional non-coding RNAs with ribozyme-like properties.

Purpose of the Study:

  • To investigate the anticancer potential of anti-antisense oligonucleotides targeting non-coding RNAs.
  • To determine the mechanism of selective cancer cell killing.
  • To explore the role of rRNA biogenesis and autophagy in the observed effects.

Main Methods:

  • Administration of anti-antisense oligonucleotides to mouse lung cells and human cancer cell lines.
  • Assessment of cell viability, apoptosis, and autophagy.
  • Analysis of bidirectional non-coding RNA stabilization and rRNA biogenesis.
  • In vitro transfection with synthesized non-coding RNA transcripts.

Main Results:

  • Anti-antisense oligonucleotides preferentially induced cell death in mouse lung-cancer cells and human cancer cells.
  • Selective killing was linked to the stabilization of bidirectional non-coding RNAs and perturbation of rRNA biogenesis in cancer cells.
  • Autophagy contributed to cytotoxicity in non-cancer cells, which was mitigated by chloroquine co-treatment.
  • In vitro synthesized non-coding RNAs confirmed their role in cell death.

Conclusions:

  • Differential responses of cancer and non-cancer cells to non-coding RNA stabilization present a therapeutic window.
  • Anti-antisense oligonucleotides targeting non-coding RNAs offer a promising strategy for cancer treatment.
  • Modulating rRNA biogenesis via non-coding RNAs represents a novel anticancer approach.

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