title: Proteome analysis of multidrug resistance in vincristine-resistant human gastric cancer cell line SGC7901/VCR.
abstract: In order to elucidate the mechanisms of multidrug resistance (MDR) of vincristine-resistant human gastric carcinoma cell line SGC7901/VCR, 2-DE was used to separate the total proteins of SGC7901/VCR and its parental cell line SGC7901. PDQuest software was applied to analyze 2-DE images, and the differential protein spots were identified by both MALDI-TOF-MS and ESI-Q-TOF-MS. Then the differential expressional levels of partially identified proteins were determined by Western blot analysis and real-time RT-PCR. Furthermore, the association of heat shock protein (HSP27), one of the highly expressed proteins in sgc7901/vcr, with MDR was analyzed using antisense inhibition of HSP27. In this study, the well-resolved, reproducible 2-DE patterns of SGC7901/VCR and SGC7901 were established, and yielded about 1100 protein-spots each. All the 24 differential proteins between the two cell lines were identified, and the differential expression levels of the partial proteins were confirmed. The suppression of HSP27 expression by HSP27 antisense oligonucleotides could enhance vincristine chemosensitivity in sgc7901/vcr and induce the cells to exhibit apoptotic morphological features after vincristine treatment. The differentially expressed proteins could be divided into six groups based on their functions: calcium-binding proteins, chaperones, proteins involved in drug detoxification or repair of DNA damage, metabolic enzymes, proteins related to cellular structure, and proteins relative to signal transduction, some of which may contribute to MDR of human gastric carcinoma cell line SGC7901/VCR. These data will be valuable for further study of the mechanisms of MDR in human gastric cancer.
authors.affiliation: Key Laboratory of Cancer Proteomics of Ministry of Health of China, Xiangya Hospital, Central South University, Changsha, Hunan, PR China.
authors.forename: Yi-Xuan
authors.initials: YX
authors.lastname: Yang
authors.forename: Zhi-Qiang
authors.initials: ZQ
authors.lastname: Xiao
authors.forename: Zhu-Chu
authors.initials: ZC
authors.lastname: Chen
authors.forename: Gui-Ying
authors.initials: GY
authors.lastname: Zhang
authors.forename: Hong
authors.initials: H
authors.lastname: Yi
authors.forename: Peng-Fei
authors.initials: PF
authors.lastname: Zhang
authors.forename: Jian-Ling
authors.initials: JL
authors.lastname: Li
authors.forename: Guo
authors.initials: G
authors.lastname: Zhu
mesh_terms: D000595:Amino Acid Sequence; D000972:Antineoplastic Agents, Phytogenic / Q000494:pharmacology*; D015153:Blotting, Western; D002135:Calcium-Binding Proteins / Q000737:chemistry; D002277:Carcinoma / Q000235:genetics* / Q000378:metabolism / Q000473:pathology / Q000628:therapy*; D045744:Cell Line, Tumor; D018432:Drug Resistance, Multiple / Q000187:drug effects*; D019008:Drug Resistance, Neoplasm / Q000187:drug effects*; D015180:Electrophoresis, Gel, Two-Dimensional; D019084:Fluorescent Antibody Technique, Indirect; D055551:HSP27 Heat-Shock Proteins; D006360:Heat-Shock Proteins / Q000378:metabolism; D006801:Humans; D007150:Immunohistochemistry; D007526:Isoelectric Point; D013058:Mass Spectrometry; D018832:Molecular Chaperones; D008969:Molecular Sequence Data; D008970:Molecular Weight; D009363:Neoplasm Proteins / Q000737:chemistry / Q000302:isolation & purification / Q000378:metabolism; D016376:Oligonucleotides, Antisense / Q000494:pharmacology; D010449:Peptide Mapping; D020543:Proteome / Q000032:analysis*; D020133:Reverse Transcriptase Polymerase Chain Reaction; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013274:Stomach Neoplasms / Q000235:genetics* / Q000378:metabolism / Q000473:pathology / Q000628:therapy*; D014750:Vincristine / Q000494:pharmacology*
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D002135:Calcium-Binding Proteins; D055551:HSP27 Heat-Shock Proteins; C057725:HSPB1 protein, human; D006360:Heat-Shock Proteins; D018832:Molecular Chaperones; D009363:Neoplasm Proteins; D016376:Oligonucleotides, Antisense; D020543:Proteome; C503113:SRI protein, human; D014750:Vincristine