title: Study of the development of chemoresistance in melanoma cell lines using proteome analysis.
abstract: Malignant melanomas have poor prognosis since treatment with anti-neoplastic agents is mostly ineffective. The biological mechanisms of this strong intrinsic therapy resistance are unknown. In order to identify new molecular factors potentially associated with the drug-resistant phenotype of malignant melanoma, a panel of human melanoma cell variants exhibiting low and high levels of resistance to four commonly used anticancer drugs in melanoma treatment, i.e., vindesine, etoposide, cisplatin, and fotemustine, was characterized using proteomic tools (two-dimensional electrophoresis for protein fractionation and matrix assisted laser desorption/ionization-time of flight (MALDI-TOF)-mass spectrometry for protein identification). In the neutral and weak acidic milieu (pH 4.0-8.0) a total number of 14 proteins showed alterations in expression whereas 20 proteins were differentially expressed in the basic milieu (pH 8.0-11.0). Besides proteins with unknown physiologic function, several factors were identified that show chaperone activity. Moreover, proteins involved in drug detoxification, metabolism, and regulation of apoptotic pathways could be identified. The possible role of these proteins in the development of chemoresistance is discussed, although detailed functional tests with these proteins have still to be performed. Nevertheless, it is clear that this proteomic approach for studying chemoresistance phenomena is a prerequisite before further investigation can yield insight into the biology and development of drug resistance in malignant melanoma.
authors.affiliation: Institut für medizinische und chemische Labordiagnostik, Landeskrankenhaus Klagenfurt, Klagenfurt, Austria. pranav.sinha@lkh-klu.at
authors.forename: Pranav
authors.initials: P
authors.lastname: Sinha
authors.forename: Julia
authors.initials: J
authors.lastname: Poland
authors.forename: Sandro
authors.initials: S
authors.lastname: Kohl
authors.forename: Martina
authors.initials: M
authors.lastname: Schnölzer
authors.forename: Heike
authors.initials: H
authors.lastname: Helmbach
authors.forename: Gero
authors.initials: G
authors.lastname: Hütter
authors.forename: Hermann
authors.initials: H
authors.lastname: Lage
authors.forename: Dirk
authors.initials: D
authors.lastname: Schadendorf
mesh_terms: D000970:Antineoplastic Agents / Q000494:pharmacology; D018929:Cell Culture Techniques / Q000379:methods; D045744:Cell Line, Tumor; D018432:Drug Resistance, Multiple / Q000187:drug effects; D019008:Drug Resistance, Neoplasm / Q000187:drug effects; D015180:Electrophoresis, Gel, Two-Dimensional; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008545:Melanoma / Q000737:chemistry* / Q000473:pathology*; D018832:Molecular Chaperones / Q000032:analysis; D009363:Neoplasm Proteins / Q000032:analysis*; D040901:Proteomics / Q000379:methods*
chemical_list: D000970:Antineoplastic Agents; D018832:Molecular Chaperones; D009363:Neoplasm Proteins