title: iTRAQ quantitative analysis of multidrug resistance mechanisms in human gastric cancer cells.
abstract: Multidrug resistance (MDR) is a major obstacle towards a successful treatment of gastric cancer. However, the mechanisms of MDR are intricate and have not been fully understood. To elucidate the molecular mechanisms of MDR in gastric cancer, we employed the proteomic approach of isobaric tags for relative and absolute quantification (iTRAQ), followed by LC-MS/MS, using the vincristine-resistant SGC7901/VCR cell line and its parental SGC7901 cell line as a model. In total, 820 unique proteins were identified and 91 proteins showed to be differentially expressed in SGC7901/VCR compared with SGC7901. Several differentially expressed proteins were further validated by western blot analysis. Furthermore, the association of MVP, one of the highly expressed proteins in SGC7901/VCR, with MDR was verified. Our study is the first application of iTRAQ technology for MDR mechanisms analysis in gastric cancer, and many of the differentially expressed proteins identified have not been linked to MDR in gastric cancer before, which showed the value of this technology in identifying differentially expressed proteins in cancer.
authors.affiliation: Key Laboratory of Molecular Biology for Infectious Diseases of Ministry of Education of China, The Second Affiliated Hospital, Chongqing Medical University, Chongqing, China.
authors.forename: Huai-Dong
authors.initials: HD
authors.lastname: Hu
authors.forename: Feng
authors.initials: F
authors.lastname: Ye
authors.forename: Da-Zhi
authors.initials: DZ
authors.lastname: Zhang
authors.forename: Peng
authors.initials: P
authors.lastname: Hu
authors.forename: Hong
authors.initials: H
authors.lastname: Ren
authors.forename: Sang-Lin
authors.initials: SL
authors.lastname: Li
mesh_terms: D000595:Amino Acid Sequence; D015153:Blotting, Western; D045744:Cell Line, Tumor; D018432:Drug Resistance, Multiple; D019008:Drug Resistance, Neoplasm; D006801:Humans; D007553:Isotope Labeling / Q000379:methods*; D008969:Molecular Sequence Data; D009363:Neoplasm Proteins / Q000737:chemistry / Q000378:metabolism; D040901:Proteomics / Q000379:methods*; D034741:RNA, Small Interfering / Q000378:metabolism; D015203:Reproducibility of Results; D013274:Stomach Neoplasms / Q000378:metabolism*; D020394:Vault Ribonucleoprotein Particles / Q000378:metabolism; D000099187:Major Vault Protein
chemical_list: D009363:Neoplasm Proteins; D034741:RNA, Small Interfering; D020394:Vault Ribonucleoprotein Particles; D000099187:Major Vault Protein