title: Targeted quantitative analysis of superoxide dismutase 1 in cisplatin-sensitive and cisplatin-resistant human ovarian cancer cells.
abstract: Protein quantification in a complex protein mixture presents a daunting task in biochemical analysis. Antibody-based immunoassays are traditional methods for protein quantification. However, there are issues associated with accuracy and specificity in these assays, especially when the changes are small (e.g., <2-fold). With recent developments in mass spectrometry, monitoring a selected peptide, thus protein, in a complex biological sample has become possible. In this study, we demonstrate a simple mass spectrometry-based method for selective measurement of a moderately low abundant protein, superoxide dismutase 1 (SOD1), in cisplatin-sensitive and cisplatin-resistant human ovarian cancer cells. Selected-reaction-monitoring (SRM) technology was employed to specifically analyze the target peptides in a pair of human ovarian cancer cell lines: 2008/2008-C13*5.25 (cisplatin-sensitive/cisplatin-resistant, respectively). The observed 1.47-fold higher expression in the resistant cell line is consistent with findings by other approaches. This robust liquid chromatography/mass spectrometry (LC/MS) method provides a powerful tool for targeted proteomic verification and/or validation studies.
authors.affiliation: Department of Biochemistry and Molecular Biology, Indiana University School of Medicine, Indianapolis, IN 46202, USA.
authors.forename: Jong Won
authors.initials: JW
authors.lastname: Kim
authors.forename: Bei
authors.initials: B
authors.lastname: Nie
authors.forename: Heather
authors.initials: H
authors.lastname: Sahm
authors.forename: Dawn P G
authors.initials: DP
authors.lastname: Brown
authors.forename: Tony
authors.initials: T
authors.lastname: Tegeler
authors.forename: Jin-Sam
authors.initials: JS
authors.lastname: You
authors.forename: Mu
authors.initials: M
authors.lastname: Wang
mesh_terms: D045744:Cell Line, Tumor; D002945:Cisplatin / Q000627:therapeutic use*; D019008:Drug Resistance, Neoplasm; D004795:Enzyme Stability; D005260:Female; D006801:Humans; D013058:Mass Spectrometry; D010051:Ovarian Neoplasms / Q000188:drug therapy* / Q000201:enzymology*; D010446:Peptide Fragments / Q000378:metabolism; D040901:Proteomics / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013482:Superoxide Dismutase / Q000032:analysis* / Q000378:metabolism; D000072105:Superoxide Dismutase-1
chemical_list: D010446:Peptide Fragments; C000606290:SOD1 protein, human; D013482:Superoxide Dismutase; D000072105:Superoxide Dismutase-1; D002945:Cisplatin