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Updated: Feb 14, 2026

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PDE5 inhibition eliminates cancer stem cells via induction of PKA signaling

Saskia Klutzny1,2, Anna Anurin1, Barbara Nicke1

  • 1Bayer AG, Drug Discovery, 13353, Berlin, Germany.

Cell Death & Disease
|February 9, 2018
PubMed

Insights

This study identifies phosphodiesterase type 5 (PDE5) inhibition as a novel strategy to eliminate cancer stem cells (CSCs). PDE5 inhibition targets CSCs by modulating cyclic nucleotide signaling pathways, offering a new therapeutic approach for cancer treatment.

Area of Science:

  • Oncology
  • Molecular Biology
  • Pharmacology

Background:

  • Cancer stem cells (CSCs) drive metastasis and treatment resistance, impacting therapy efficacy.
  • Understanding CSC maintenance pathways is crucial for developing targeted therapies.
  • Current strategies specifically targeting CSCs are limited.

Purpose of the Study:

  • To identify novel compounds targeting cancer stem cells (CSCs).
  • To establish a robust screening system for CSC identification and characterization.
  • To investigate the therapeutic potential of targeting CSC maintenance and survival pathways.

Main Methods:

  • Developed an aldehyde dehydrogenase (ALDH)-based phenotypic screening system for automated CSC identification.
  • Utilized high-content single-cell analysis to quantify ALDH-high CSC subpopulations.
  • Conducted a small molecule screen to identify compounds affecting CSCs.
  • Investigated the role of Wnt signaling and PDE5 inhibition in CSC maintenance.

Main Results:

  • Validated high ALDH activity as a reliable marker for CSCs in vitro.
  • Confirmed Wnt signaling is essential for CSC maintenance in SUM149 breast cancer cells.
  • Identified phosphodiesterase type 5 (PDE5) inhibition as a strategy to target CSCs across multiple cancer types.
  • Demonstrated that PDE5 inhibition eliminates CSCs via a novel cGMP- and cAMP/PKA-dependent mechanism, independent of PKG signaling.

Conclusions:

  • ALDH-based screening is effective for identifying CSC subpopulations.
  • PDE5 inhibition represents a promising therapeutic strategy for eliminating CSCs.
  • The identified mechanism of PDE5 inhibition offers new insights into CSC targeting for cancer therapy.

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