title: Characteristics of CD133(+) human colon cancer SW620 cells.
abstract: Worldwide, colorectal cancer is the third most common type of cancer affecting both sexes. It has been proposed that a small subset of cancer cells (cancer stem cells) within each tumor is able to initiate tumor growth. In 2007, two research groups simultaneously identified a colon cancer stem cell population in human tumors by the use of CD133 expression. In the present study, we used a human colon cancer cell line, SW620, to analyze the cancer stem cell-like characteristics of CD133(+) cells in vitro and in vivo. In vitro, CD133(+) SW620 cells had a higher proliferative capacity, were more irradiation- and chemotherapy-resistant, and had a higher expression of β-catenin compared with CD133(-) cells. Injections of either CD133(+) or CD133(-) cells into the skin or rectal mucosa of NOD/SCID mice led to tumors; however, injection of CD133(+) cells resulted in the formation of larger tumors. Tumors derived from injections of CD133(-) cells did not contain any CD133(+) cells, whereas tumors derived from injections of CD133(+) cells did contain CD133(+) cells, suggesting self-renewing capability. However, the proportion of CD133(+) cells in the newly formed tumors in vivo was lower than the proportion of CD133(+) cells in vitro. In conclusion, the human colon cancer cell line, SW620, contains both CD133(+) and CD133(-) phenotypes, and the CD133(+) phenotype has characteristics consistent with those of cancer stem cells.
authors.affiliation: Department of Surgery, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan. hi_ro_no_bu-kw@rk9.so-net.ne.jp
authors.forename: Hironobu
authors.initials: H
authors.lastname: Kawamoto
authors.forename: Takeshi
authors.initials: T
authors.lastname: Yuasa
authors.forename: Yasuhiro
authors.initials: Y
authors.lastname: Kubota
authors.forename: Masayuki
authors.initials: M
authors.lastname: Seita
authors.forename: Hiromi
authors.initials: H
authors.lastname: Sasamoto
authors.forename: Javed M
authors.initials: JM
authors.lastname: Shahid
authors.forename: Takahiro
authors.initials: T
authors.lastname: Hayashi
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Nakahara
authors.forename: Reham
authors.initials: R
authors.lastname: Hassan
authors.forename: Masaya
authors.initials: M
authors.lastname: Iwamuro
authors.forename: Eisaku
authors.initials: E
authors.lastname: Kondo
authors.forename: Shuhei
authors.initials: S
authors.lastname: Nakaji
authors.forename: Noriaki
authors.initials: N
authors.lastname: Tanaka
authors.forename: Naoya
authors.initials: N
authors.lastname: Kobayashi
mesh_terms: D000071916:AC133 Antigen; D000818:Animals; D015703:Antigens, CD / Q000235:genetics / Q000378:metabolism*; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D003110:Colonic Neoplasms / Q000235:genetics / Q000473:pathology*; D019008:Drug Resistance, Neoplasm / Q000235:genetics; D005434:Flow Cytometry; D015972:Gene Expression Regulation, Neoplastic; D006023:Glycoproteins / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D051379:Mice; D016513:Mice, SCID; D009368:Neoplasm Transplantation; D014411:Neoplastic Stem Cells / Q000378:metabolism / Q000473:pathology; D010455:Peptides / Q000235:genetics / Q000378:metabolism*; D040521:Subcutaneous Tissue / Q000473:pathology
chemical_list: D000071916:AC133 Antigen; D015703:Antigens, CD; D006023:Glycoproteins; C000606023:PROM1 protein, human; D010455:Peptides; C000606024:Prom1 protein, mouse