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Heterogeneity of Cancer Stem Cells: Rationale for Targeting the Stem Cell Niche
Maximilian Boesch1, Sieghart Sopper2, Alain G Zeimet3
1Institute of Immunobiology, Kantonsspital St. Gallen, Rorschacherstrasse 95, 9007 St. Gallen, Switzerland; Internal Medicine V, Medical University of Innsbruck, Anichstrasse 35, 6020 Innsbruck, Austria; Tyrolean Cancer Research Institute (TKFI), Innrain 66, 6020 Innsbruck, Austria.
Abstract:
Malignancy is fuelled by distinct subsets of stem-like cells which persist under treatment and provoke drug-resistant recurrence. Eradication of these cancer stem cells has therefore become a prime objective for the development and design of novel classes of anti-cancer therapeutics with improved clinical efficacy. Here, we portray potentially clinically-relevant hallmarks of cancer stem cells and focus on their recently appreciated properties of cell variability and plasticity, both of which make them elusive targets for cancer therapies. We reason that this 'disguise in heterogeneity' has fundamental implications for clinical management and elaborate on rational strategies to combat this diversity and target a broad range of tumorigenic cells. We propose exploitation of cancer stem cell niche dependence as a promising approach to interfere with various, rather than few, cancer stem cell subsets and suggest cancer-associated fibroblasts as a prime microenvironmental target for tumor stemness-depleting intervention.
Insights
Cancer stem cells drive tumor recurrence and drug resistance. Targeting their variability and niche dependence offers a promising strategy to eradicate these elusive cells and improve cancer therapy.
Area of Science:
- Oncology
- Cancer Biology
- Stem Cell Research
Background:
- Cancer stem cells (CSCs) are crucial drivers of malignancy, persisting through treatment and causing drug-resistant recurrence.
- Eradicating CSCs is a key goal for developing effective anti-cancer therapeutics.
Purpose of the Study:
- To highlight clinically relevant hallmarks of CSCs, focusing on their heterogeneity and plasticity.
- To propose strategies for combating CSC diversity and targeting tumorigenic cells effectively.
- To explore CSC niche dependence and microenvironmental targets for therapeutic intervention.
Main Methods:
- Review and analysis of CSC properties, including variability and plasticity.
- Elaboration on rational strategies to address CSC heterogeneity.
- Proposal of targeting CSC niche interactions and microenvironmental factors.
Main Results:
- CSCs exhibit significant cell variability and plasticity, making them difficult targets.
- Tumor heterogeneity, or 'disguise in heterogeneity,' poses challenges for current cancer therapies.
- Exploiting CSC niche dependence can target diverse CSC subsets.
Conclusions:
- Targeting CSCs is essential for overcoming treatment resistance and improving clinical outcomes.
- Strategies addressing CSC heterogeneity, such as targeting their niche, are vital.
- Cancer-associated fibroblasts represent a potential microenvironmental target for depleting tumor stemness.
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