Biological characteristics of a cell subpopulation in tongue squamous cell carcinoma

OBJECTIVES: To isolate the CD133+CD44+ cells from human tongue squamous cell carcinoma (TSCC) Tca8113 cell line and investigate biological characteristics of them. MATERIALS AND METHODS: Immunomagnetic microbeads were applied to sort the CD133+CD44+ cells. Flow cytometry was used to detect isolation purity. The proliferation, clone-formation efficiencies, invasion and migration, gene expressions, and tumor-formation abilities were analyzed among CD133+CD44+, CD133-CD44- and total population of cells. RESULTS: The average purities of CD133+ and CD44+ cells reached 97.3% and 98.7%, respectively. The proliferation of CD133+ CD44+ cells was significantly higher than the other two groups. The clone-forming efficiency of three groups was 70%, 8%, and 14%, respectively. The average invaded and migrated cell numbers of CD133+ CD44+ and total population cells were 132 and 36.2, 311.6, and 156.2, respectively. The expressions of Bcl2 and Sox2 in CD133+ CD44+ cells were significantly higher than those in total population cells. A total of 10 4 CD133+ CD44+ cells could form secondary tumors in nude mice, while the total population group needed 10 6 cells. CONCLUSIONS: The CD133+ CD44+ subpopulation cells possess stem-like characteristics. They appear to be the potential targets for future biology therapy of human TSCC. Oral Diseases (2012) 18, 169-177