CD133(-) Cells, Derived From a Single Human Colon Cancer Cell Line, Are More Resistant to 5-Fluorouracil (FU) Than CD133(+) Cells, Dependent on the β1-Integrin Signaling

Background and Aim. Recently, the cancer stem cells (CSCs) theory has been proposed, and CD133 has been suggested as a potential marker of CSCs in various cancer types. In the present study, we aimed evaluate CD133 as a potential marker of colorectal CSCs and, for this purpose, isolated CD133(+) and CD133(-) cells from a single colorectal cancer cell line, and compared their features, especially related to the tumor-forming and differentiation abilities, and the sensitivity to chemotherapy. Methods and Results. CD133(+) cells had higher in vivo tumor-forming ability than CD133(-) cells, and in culture, they progressively differentiated into CD133(-) cells, but not vice-versa. On the other hand, CD133(-) cells were more resistant to 5-fluorouracil (FU) treatment than CD133(+) cells, and it was found to be dependent on the higher expression of beta 1-integrins, and consequently, higher ability to bind collagen. Disruption of the beta 1-integrin function abrogated the chemoresistance. Conclusion. From the present results, we concluded that colorectal cancer CD133(+) cells, although showing some features of CSCs, are not more resistant to 5-FU than CD133(-) cells. Therefore, definite conclusions can not be drawn yet, but it is strongly suggestive that CD133 should not be used as a single CSC marker of colorectal cancer. (C) 2012 Elsevier Inc. All rights reserved.