title: Expression of multidrug resistance proteins and accumulation of cisplatin in human non-small cell lung cancer cells.
abstract: In order to understand and overcome multidrug resistance (MDR) of human non-small cell lung cancer (NSCLC), mRNA and protein expression levels of P-glycoprotein (MDR1), multidrug resistance-associated protein 1 (MRP1), and lung resistance-related protein (LRP) were investigated and compared with the chemosensitivity and the intracellular/intranuclear cisplatin accumulation of three NSCLC cell lines (Ma-10, Ma-31, and Ma-46). Ma-31 was more resistant than Ma-10 and Ma-46 to cisplatin, carboplatin, etoposide, and paclitaxel. The mRNA level of MDR1 was extremely low, and MDR1 protein was not detected in all cell lines. MRP1 mRNA expression was highest in Ma-31 and lowest in Ma-10, but there was no notable difference between the MRP1 protein expression in three cell lines. LRP mRNA/protein was equally expressed in Ma-10 and Ma-31, but was nominal in Ma-46. The intracellular/intranuclear cisplatin accumulation of the cells was determined to be Ma-31>Ma-46>Ma-10. Thus, MDR1, MRP1, and LRP mRNA and protein expression levels were not correlated with the chemosensitivity or the intracellular/intranuclear cisplatin accumulation of each cell line. The present results indicate that MDR proteins (MDR1, MRP1, and LRP) may not play an important role in the chemoresistance and drug efflux of NSCLC cells.
authors.affiliation: Graduate School of Pharmaceutical Sciences, The University of Tokushima, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Ikuta
authors.forename: Kazu
authors.initials: K
authors.lastname: Takemura
authors.forename: Kenichi
authors.initials: K
authors.lastname: Sasaki
authors.forename: Masaru
authors.initials: M
authors.lastname: Kihara
authors.forename: Masuhiro
authors.initials: M
authors.lastname: Nishimura
authors.forename: Nobuhiko
authors.initials: N
authors.lastname: Ueda
authors.forename: Shinsaku
authors.initials: S
authors.lastname: Naito
authors.forename: Eibai
authors.initials: E
authors.lastname: Lee
authors.forename: Eiji
authors.initials: E
authors.lastname: Shimizu
authors.forename: Aiko
authors.initials: A
authors.lastname: Yamauchi
mesh_terms: D000970:Antineoplastic Agents / Q000378:metabolism* / Q000494:pharmacology; D002289:Carcinoma, Non-Small-Cell Lung / Q000188:drug therapy* / Q000235:genetics / Q000378:metabolism*; D045744:Cell Line, Tumor; D002945:Cisplatin / Q000378:metabolism* / Q000494:pharmacology; D019008:Drug Resistance, Neoplasm / Q000235:genetics*; D020869:Gene Expression Profiling; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans
chemical_list: D000970:Antineoplastic Agents; D002945:Cisplatin