title: Enhanced MDR1 expression and chemoresistance of cancer stem cells derived from glioblastoma.
abstract: We established a cancer stem (CS) cell line, U87CS, by means of spheroid culture of U87MG cells derived from glioblastoma (GBM) in neuronal stem cell medium. U87CS cells presented positive immunohistochemical staining for multidrug resistance (MDR)1 and CD133, a marker for a subset of leukemia and GBM CS cells. The gene expression of MDR1 and CD133 on U87CS cells increased by an average of 8.51 and 47.18 times, respectively, compared to the levels on U87MG cells by real-time quantitative RT-PCR. U87CS cells possessed stronger drug-resistance to conventional anti-cancer drugs, such as doxorubicin (Dox), etoposide (VP-16), carboplastin, and BCNU than U87MG cells. Double immunofluoresence staining showed co-expression of MDR1 and CD133 on U87CS cells transplanted into nude mice brains. In addition, we identified the crossreactivity of CD133 and MDR1 in a surgical specimen of GBM. Our results suggest that CS cells may be resistant to current chemotherapy and represent a novel target for GBM therapeutics.
authors.affiliation: Department of Neurosurgery, Medical School, Kochi University, Kochi, Japan.
authors.forename: Eiichi
authors.initials: E
authors.lastname: Nakai
authors.forename: Kaechang
authors.initials: K
authors.lastname: Park
authors.forename: Toshio
authors.initials: T
authors.lastname: Yawata
authors.forename: Takahiro
authors.initials: T
authors.lastname: Chihara
authors.forename: Ayano
authors.initials: A
authors.lastname: Kumazawa
authors.forename: Hiromichi
authors.initials: H
authors.lastname: Nakabayashi
authors.forename: Keiji
authors.initials: K
authors.lastname: Shimizu
mesh_terms: D000071916:AC133 Antigen; D018435:ATP Binding Cassette Transporter, Subfamily B; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000235:genetics / Q000378:metabolism*; D000368:Aged; D000818:Animals; D015703:Antigens, CD / Q000235:genetics / Q000378:metabolism; D000970:Antineoplastic Agents / Q000494:pharmacology; D045744:Cell Line, Tumor; D002470:Cell Survival / Q000187:drug effects; D004305:Dose-Response Relationship, Drug; D019008:Drug Resistance, Neoplasm / Q000235:genetics; D005455:Fluorescent Antibody Technique; D015972:Gene Expression Regulation, Neoplastic; D005909:Glioblastoma / Q000235:genetics / Q000378:metabolism* / Q000473:pathology; D006023:Glycoproteins / Q000235:genetics / Q000378:metabolism; D006801:Humans; D008297:Male; D051379:Mice; D008819:Mice, Nude; D014411:Neoplastic Stem Cells / Q000187:drug effects / Q000378:metabolism* / Q000473:pathology; D010455:Peptides / Q000235:genetics / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D018874:Spheroids, Cellular; D015854:Up-Regulation
chemical_list: C513055:ABCB1 protein, human; D000071916:AC133 Antigen; D018435:ATP Binding Cassette Transporter, Subfamily B; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D015703:Antigens, CD; D000970:Antineoplastic Agents; D006023:Glycoproteins; C000606023:PROM1 protein, human; D010455:Peptides; C000606024:Prom1 protein, mouse