title: Isolation and molecular characterization of cancer stem cells in MMTV-Wnt-1 murine breast tumors.
abstract: In human breast cancers, a phenotypically distinct minority population of tumorigenic (TG) cancer cells (sometimes referred to as cancer stem cells) drives tumor growth when transplanted into immunodeficient mice. Our objective was to identify a mouse model of breast cancer stem cells that could have relevance to the study of human breast cancer. To do so, we used breast tumors of the mouse mammary tumor virus (MMTV)-Wnt-1 mice. MMTV-Wnt-1 breast tumors were harvested, dissociated into single-cell suspensions, and sorted by flow cytometry on Thy1, CD24, and CD45. Sorted cells were then injected into recipient background FVB/NJ female syngeneic mice. In six of seven tumors examined, Thy1+CD24+ cancer cells, which constituted approximately 1%-4% of tumor cells, were highly enriched for cells capable of regenerating new tumors compared with cells of the tumor that did not fit this profile ("not-Thy1+CD24+"). Resultant tumors had a phenotypic diversity similar to that of the original tumor and behaved in a similar manner when passaged. Microarray analysis comparing Thy1+CD24+ tumor cells to not-Thy1+CD24+ cells identified a list of differentially expressed genes. Orthologs of these differentially expressed genes predicted survival of human breast cancer patients from two different study groups. These studies suggest that there is a cancer stem cell compartment in the MMTV-Wnt-1 murine breast tumor and that there is a clinical utility of this model for the study of cancer stem cells.
authors.affiliation: Department of Pediatrics, University of Michigan Medical School, Ann Arbor, Michigan, USA.
authors.forename: Robert W
authors.initials: RW
authors.lastname: Cho
authors.forename: Xinhao
authors.initials: X
authors.lastname: Wang
authors.forename: Maximilian
authors.initials: M
authors.lastname: Diehn
authors.forename: Kerby
authors.initials: K
authors.lastname: Shedden
authors.forename: Grace Y
authors.initials: GY
authors.lastname: Chen
authors.forename: Gavin
authors.initials: G
authors.lastname: Sherlock
authors.forename: Austin
authors.initials: A
authors.lastname: Gurney
authors.forename: John
authors.initials: J
authors.lastname: Lewicki
authors.forename: Michael F
authors.initials: MF
authors.lastname: Clarke
mesh_terms: D000818:Animals; D002469:Cell Separation / Q000379:methods; D005260:Female; D005434:Flow Cytometry; D006801:Humans; D008325:Mammary Neoplasms, Experimental / Q000235:genetics* / Q000473:pathology*; D008324:Mammary Tumor Virus, Mouse / Q000472:pathogenicity; D051379:Mice; D008822:Mice, Transgenic; D009368:Neoplasm Transplantation; D014411:Neoplastic Stem Cells / Q000145:classification / Q000378:metabolism* / Q000473:pathology*; D020411:Oligonucleotide Array Sequence Analysis; D012192:Retroviridae Infections / Q000235:genetics / Q000473:pathology; D014185:Transplantation, Isogeneic; D014412:Tumor Virus Infections / Q000235:genetics / Q000473:pathology; D051155:Wnt1 Protein / Q000235:genetics
chemical_list: D051155:Wnt1 Protein; C495246:Wnt1 protein, mouse