title: Gene expression profiles with cDNA microarray reveal RhoGDI as a predictive marker for paclitaxel resistance in ovarian cancers.
abstract: In the current study, we identified paclitaxel-resistant related genes by comparing gene expression profiles of paclitaxel-resistant and parent ovarian cancer cell lines. Gene expression profiles of the human ovarian cancer cell line (KF28), cisplatin-resistant cell line (KFr13) induced from KF28, and paclitaxel-resistant cell lines (KF28TX and KFr13TX) induced by exposing KF28 and KFr13 to dose-escalating paclitaxel were compared and analyzed using cDNA microarray. Of 557 human cancer-related cDNA transcripts compared, 5 genes were found to be underexpressed and 5 genes overexpressed in the paclitaxel-resistant KF28TX, while another paclitaxel-resistant KFr13TX had 5 underexpressed and 8 overexpressed genes. Among these genes, overexpression of the ATP-binding cassette subfamily (MDR-1), Rho guanine dinucleotide phosphate dissociation inhibitor beta (RhoGDI) and insulin-like growth factor binding protein 3 (IGFBP-3) was observed in both paclitaxel-resistant cell lines. Using real-time quantitative PCR, we confirmed the array results. We therefore conclude that IGFBP-3, RhoGDI and MDR-1 were correlated with paclitaxel resistance. Moreover, immunohistochemical staining was analyzed in 22 serous ovarian cancer tissues from patients who received paclitaxel-based chemotherapy, and RhoGDI overexpression was observed more frequently in non-responsers than in responders (p=0.004). RhoGDI expression proved to be a predictive marker of paclitaxel resistance not only in paclitaxel-resistant cell lines, but also in clinical samples.
authors.affiliation: Department of Obstetrics and Gynecology, Saitama Medical College, Iruma-gun, Saitama 350-0495, Japan.
authors.forename: Tomoko
authors.initials: T
authors.lastname: Goto
authors.forename: Masashi
authors.initials: M
authors.lastname: Takano
authors.forename: Masaru
authors.initials: M
authors.lastname: Sakamoto
authors.forename: Ayako
authors.initials: A
authors.lastname: Kondo
authors.forename: Junko
authors.initials: J
authors.lastname: Hirata
authors.forename: Tsunekazu
authors.initials: T
authors.lastname: Kita
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Tsuda
authors.forename: Yoshio
authors.initials: Y
authors.lastname: Tenjin
authors.forename: Yoshihiro
authors.initials: Y
authors.lastname: Kikuchi
mesh_terms: D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1 / Q000235:genetics / Q000378:metabolism; D000972:Antineoplastic Agents, Phytogenic / Q000627:therapeutic use*; D014408:Biomarkers, Tumor / Q000235:genetics*; D018284:Cystadenocarcinoma, Serous / Q000188:drug therapy / Q000235:genetics / Q000473:pathology; D019008:Drug Resistance, Neoplasm / Q000235:genetics*; D005260:Female; D020869:Gene Expression Profiling; D015972:Gene Expression Regulation, Neoplastic; D020730:Guanine Nucleotide Dissociation Inhibitors / Q000235:genetics*; D006801:Humans; D018972:Insulin-Like Growth Factor Binding Protein 3 / Q000235:genetics / Q000378:metabolism; D020411:Oligonucleotide Array Sequence Analysis; D010051:Ovarian Neoplasms / Q000188:drug therapy / Q000235:genetics* / Q000473:pathology; D017239:Paclitaxel / Q000627:therapeutic use*; D014407:Tumor Cells, Cultured; D062948:rho Guanine Nucleotide Dissociation Inhibitor alpha; D062947:rho-Specific Guanine Nucleotide Dissociation Inhibitors
chemical_list: C569638:ARHGDIA protein, human; D020168:ATP Binding Cassette Transporter, Subfamily B, Member 1; D000972:Antineoplastic Agents, Phytogenic; D014408:Biomarkers, Tumor; D020730:Guanine Nucleotide Dissociation Inhibitors; D018972:Insulin-Like Growth Factor Binding Protein 3; D062948:rho Guanine Nucleotide Dissociation Inhibitor alpha; D062947:rho-Specific Guanine Nucleotide Dissociation Inhibitors; D017239:Paclitaxel