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A reliable method for the sorting and identification of ALDH(high) cancer stem cells by flow cytometry.
Experimental and Therapeutic Medicine 2017 October
Cancer stem cells (CSCs) are a rare tumorigenic population of cells found in multiple types of cancer. It has been suggested that CSCs are responsible for cancer drug resistance, metastasis and recurrence. Therefore, it is important to develop techniques to correctly sort and identify CSCs. In the current study, the sorting and identification of aldehyde dehydrogenase high (ALDH(high)) CSCs was performed using flow cytometry. Cells from three colon cancer cell lines were cultured in serum-free medium to obtain CSCs-enriched spheroid cells. Subsequently, two subpopulations of ALDH(high) CSCs were isolated by flow cytometry either with the use of propidium iodide (PI) or not, respectively. The two subpopulations of ALDH(high) CSCs exhibited distinct characteristics, including stem cell related gene expression, self-renewal capacity and tumorigenicity in vitro and in vivo. Key regulators of the epithelial-mesenchymal transition (EMT), including vimentin, snail and slug were highly expressed in ALDH(high) CSCs. Therefore, the current study indicates that PI staining prior to the sorting of ALDH(high) CSCs by flow cytometry is an appropriate system for the study of CSCs. The current study also demonstrated that there was partial overlap between the transcriptional programs underlying the EMT and CSCs.
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