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RGD-Coated Polymer Nanoworms for Enriching Cancer Stem Cells
Yushu Gu1, Valentin Bobrin1, Dayong Zhang1,2
1Australian Institute for Bioengineering and Nanotechnology (AIBN), University of Queensland (UQ), St Lucia, Brisbane, QLD 4072, Australia.
Abstract:
Cancer stem cells (CSCs) are primarily responsible for tumour drug resistance and metastasis; thus, targeting CSCs can be a promising approach to stop cancer recurrence. However, CSCs are small in numbers and readily differentiate into matured cancer cells, making the study of their biological features, including therapeutic targets, difficult. The use of three-dimensional (3D) culture systems to enrich CSCs has some limitations, including low sphere forming efficiency, enzymatic digestion that may damage surface proteins, and more importantly no means to sustain the stem properties. A responsive 3D polymer extracellular matrix (ECM) system coated with RGD was used to enrich CSCs, sustain stemness and avoid enzymatic dissociation. RGD was used as a targeting motif and a ligand to bind integrin receptors. We found that the system was able to increase sphere forming efficiency, promote the growth of spheric cells, and maintain stemness-associated properties compared to the current 3D culture. We showed that continuous culture for three generations of colon tumour spheroid led to the stem marker CD24 gradually increasing. Furthermore, the new system could enhance the cancer cell sphere forming ability for the difficult triple negative breast cancer cells, MBA-MD-231. The key stem gene expression for colon cancer also increased with the new system. Further studies indicated that the concentration of RGD, especially at high doses, could inhibit stemness. Taken together, our data demonstrate that our RGD-based ECM system can facilitate the enrichment of CSCs and now allow for the investigation of new therapeutic approaches for colorectal cancer or other cancers.
Insights
This study introduces a novel 3D extracellular matrix (ECM) system that effectively enriches cancer stem cells (CSCs) and sustains their stemness. This RGD-coated system improves CSC enrichment and facilitates research into new cancer therapies.
Area of Science:
- Biotechnology
- Cancer Research
- Materials Science
Background:
- Cancer stem cells (CSCs) drive tumor drug resistance and metastasis, making them key targets for cancer recurrence prevention.
- Studying CSCs is challenging due to their low numbers, differentiation tendency, and limitations of current 3D culture methods.
- Existing 3D culture systems for CSC enrichment face issues like low sphere formation efficiency and potential damage from enzymatic dissociation.
Purpose of the Study:
- To develop and evaluate a novel responsive 3D polymer extracellular matrix (ECM) system for enriching cancer stem cells (CSCs).
- To sustain CSC stemness and avoid enzymatic dissociation during culture.
- To investigate the potential of this RGD-coated ECM system for advancing cancer stem cell research and therapeutic development.
Main Methods:
- Development of a responsive 3D polymer extracellular matrix (ECM) system coated with RGD (Arg-Gly-Asp peptide).
- Utilized RGD as a targeting motif to bind integrin receptors for CSC enrichment and stemness maintenance.
- Compared the performance of the new RGD-based ECM system with existing 3D culture methods using colon and triple-negative breast cancer cells.
Main Results:
- The RGD-coated ECM system significantly increased sphere forming efficiency and promoted the growth of spheroid cells.
- The system effectively maintained stemness-associated properties and enhanced CSC enrichment, even for challenging triple-negative breast cancer cells (MBA-MD-231).
- Continuous culture demonstrated a gradual increase in the stem marker CD24 and key stem gene expression in colon cancer cells, while high RGD concentrations inhibited stemness.
Conclusions:
- The developed RGD-based ECM system offers a superior method for enriching cancer stem cells (CSCs) and sustaining their stemness compared to current 3D culture techniques.
- This innovative system overcomes limitations of traditional methods, enabling more effective study of CSCs and their biological features.
- The RGD-based ECM platform holds significant promise for facilitating the investigation of novel therapeutic strategies targeting colorectal cancer and other malignancies.
