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In vitro Tumorsphere Formation Assays
Sara Johnson1, Hexin Chen1, Pang-Kuo Lo1
1Biological Sciences Department, University of South Carolina, Columbia, USA.
Bio-Protocol
|August 9, 2016
Summary
Tumorsphere formation assays identify cancer stem cells. These assays use serum-free conditions to enrich and quantify cancer stem/progenitor cells, aiding tumor characterization.
Area of Science:
- Oncology
- Cell Biology
Background:
- Cancer stem cells (CSCs) are crucial for tumor initiation and progression.
- Tumorspheres are spherical structures formed by CSCs in vitro.
- Identifying and quantifying CSCs is essential for understanding tumor biology.
Purpose of the Study:
- To describe the tumorsphere formation assay.
- To explain how this assay enriches for cancer stem/progenitor cells.
- To highlight the utility of tumorsphere assays in characterizing CSC populations.
Main Methods:
- Culturing cells in serum-free, non-adherent conditions.
- Observing and quantifying the formation of tumorspheres.
- Distinguishing tumorspheres from single or aggregated cells.
Main Results:
- Tumorspheres are distinct, solid spherical formations indicative of CSC proliferation.
- Serum-free, non-adherent conditions selectively enrich CSC populations.
- Tumorsphere size and number correlate with CSC percentage in vitro and in vivo.
Conclusions:
- The tumorsphere formation assay is a valuable tool for estimating CSC frequency.
- This assay aids in the characterization of CSCs within various cancer cell lines and tumors.
- Understanding CSCs through tumorsphere assays can inform cancer research and therapeutic strategies.
