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Cell and Tumor Biology |
1 Department of Carcinogenesis, Science Park-Research Division, The University of Texas M.D. Anderson Cancer Center, Smithville, Texas and 2 Program in Environmental and Molecular Carcinogenesis, Graduate School of Biomedical Sciences, Houston, Texas
Requests for reprints: Dean Tang, Department of Carcinogenesis, Science Park-Research Division, The University of Texas M.D. Anderson Cancer Center, 1808 Park Road 1C, Smithville, TX 78957. Phone: 512-237-9575; Fax: 512-237-2475; E-mail: dtang{at}mdanderson.org.
Recently, several human cancers including leukemia and breast and brain tumors were found to contain stem-like cancer cells called cancer stem cells (CSC). Most of these CSCs were identified using markers that identify putative normal stem cells. In some cases, stem-like cancer cells were identified using the flow cytometry-based side population technique. In this study, we first show that
30% of cultured human cancer cells and xenograft tumors examined (
30 in total) possess a detectable side population. Purified side population cells from two cell lines (U373 glioma and MCF7 breast cancer) and a xenograft prostate tumor (LAPC-9) are more tumorigenic than the corresponding nonside population cells. These side population cells also possess some intrinsic stem cell properties as they generate nonside population cells in vivo, can be further transplanted, and preferentially express some "stemness" genes, including Notch-1 and ß-catenin. Because the side population phenotype is mainly mediated by ABCG2, an ATP-binding cassette half-transporter associated with multidrug resistance, we subsequently studied ABCG2+ and ABCG2 cancer cells with respect to their tumorigenicity in vivo. Although side population cells show increased ABCG2 mRNA expression relative to the nonside population cells and all cancer cells and xenograft tumors examined express ABCG2 in a small fraction (0.5-3%) of the cells, highly purified ABCG2+ cancer cells, surprisingly, have very similar tumorigenicity to the ABCG2 cancer cells. Mechanistic studies indicate that ABCG2 expression is associated with proliferation and ABCG2+ cancer cells can generate ABCG2 cells. However, ABCG2 cancer cells can also generate ABCG2+ cells. Furthermore, the ABCG2 cancer cells form more and larger clones in the long-term clonal analyses and the ABCG2 population preferentially expresses several "stemness" genes. Taken together, our results suggest that (a) the side population is enriched with tumorigenic stem-like cancer cells, (b) ABCG2 expression identifies mainly fast-cycling tumor progenitors, and (c) the ABCG2 population contains primitive stem-like cancer cells.
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M. S. Chen, W. A. Woodward, F. Behbod, S. Peddibhotla, M. P. Alfaro, T. A. Buchholz, and J. M. Rosen Wnt/beta-catenin mediates radiation resistance of Sca1+ progenitors in an immortalized mammary gland cell line J. Cell Sci., February 1, 2007; 120(3): 468 - 477. [Abstract] [Full Text] [PDF] |
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W. A. Woodward, M. S. Chen, F. Behbod, M. P. Alfaro, T. A. Buchholz, and J. M. Rosen WNT/beta-catenin mediates radiation resistance of mouse mammary progenitor cells PNAS, January 9, 2007; 104(2): 618 - 623. [Abstract] [Full Text] [PDF] |
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J. A. Kruger, C. D. Kaplan, Y. Luo, H. Zhou, D. Markowitz, R. Xiang, and R. A. Reisfeld Characterization of stem cell-like cancer cells in immune-competent mice Blood, December 1, 2006; 108(12): 3906 - 3912. [Abstract] [Full Text] [PDF] |
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Y. Morita, H. Ema, S. Yamazaki, and H. Nakauchi Non-side-population hematopoietic stem cells in mouse bone marrow Blood, October 15, 2006; 108(8): 2850 - 2856. [Abstract] [Full Text] [PDF] |
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X. Fan, W. Matsui, L. Khaki, D. Stearns, J. Chun, Y.-M. Li, and C. G. Eberhart Notch Pathway Inhibition Depletes Stem-like Cells and Blocks Engraftment in Embryonal Brain Tumors. Cancer Res., August 1, 2006; 66(15): 7445 - 7452. [Abstract] [Full Text] [PDF] |
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F. Behbod, W. Xian, C. A. Shaw, S. G. Hilsenbeck, A. Tsimelzon, and J. M. Rosen Transcriptional Profiling of Mammary Gland Side Population Cells Stem Cells, April 1, 2006; 24(4): 1065 - 1074. [Abstract] [Full Text] [PDF] |
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R. P. Hill Identifying Cancer Stem Cells in Solid Tumors: Case Not Proven Cancer Res., February 15, 2006; 66(4): 1891 - 1896. [Abstract] [Full Text] [PDF] |
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L. Miele Notch Signaling Clin. Cancer Res., February 15, 2006; 12(4): 1074 - 1079. [Full Text] [PDF] |
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