title: Comparative proteomics of glioma stem cells and differentiated tumor cells identifies S100A9 as a potential therapeutic target.
abstract: Recent studies have suggested the existence of a small subset of cancer cells called cancer stem cells (CSCs), which possess the ability to initiate malignancies, promote tumor formation, drive metastasis, and evade conventional chemotherapies. Elucidation of the specific signaling pathway and mechanism underlying the action of CSCs might improve the efficacy of cancer treatments. In this study, we analyzed differentially expressed proteins between glioma stem cells and differentiated tumor cells isolated from the human glioma cell line, U251, via iTRAQ-tagging combined with two dimensional liquid chromatography tandem MS analysis to identify proteins correlated with specific features of CSCs. Out of a total data set of 559 identified proteins, 29 proteins were up-regulated in the glioma stem cells when compared with the differentiated cells. Interestingly, The expression level of S100A9 was fivefold higher in glioma stem cells than differentiated cells. Similar results were also observed in glioma stem cells derived from other glioma cells. More importantly, knockdown of S100A9 by RNA interference suppressed the proliferation of glioma stem cell line and decreased the growth of xenograft tumors in vivo. Taken together, these results indicate that the tumorigenesis potential of CSCs arises from highly expressed S100A9.
authors.affiliation: Department of Neurosurgery, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, China.
authors.forename: Song
authors.initials: S
authors.lastname: Chen
authors.forename: Hongxin
authors.initials: H
authors.lastname: Zhao
authors.forename: Jinmu
authors.initials: J
authors.lastname: Deng
authors.forename: Peng
authors.initials: P
authors.lastname: Liao
authors.forename: Zhongye
authors.initials: Z
authors.lastname: Xu
authors.forename: Yuan
authors.initials: Y
authors.lastname: Cheng
mesh_terms: D000818:Animals; D001932:Brain Neoplasms / Q000188:drug therapy / Q000378:metabolism* / Q000473:pathology; D040502:Calgranulin B / Q000096:biosynthesis / Q000235:genetics*; D002454:Cell Differentiation / Q000235:genetics; D045744:Cell Line, Tumor; D015972:Gene Expression Regulation, Neoplastic / Q000235:genetics; D005910:Glioma / Q000188:drug therapy / Q000378:metabolism* / Q000473:pathology; D006801:Humans; D051379:Mice; D058990:Molecular Targeted Therapy; D009363:Neoplasm Proteins / Q000096:biosynthesis; D014411:Neoplastic Stem Cells / Q000166:cytology / Q000378:metabolism*; D040901:Proteomics; D015398:Signal Transduction / Q000235:genetics; D023041:Xenograft Model Antitumor Assays
chemical_list: D040502:Calgranulin B; D009363:Neoplasm Proteins
keywords: GLIOMA; GLIOMA STEM CELLS; PROLIFERATION; S100A9; TUMORIGENESIS; iTRAQ