title: Analysis of ATP-binding cassette transporter expression in drug-selected cell lines by a microarray dedicated to multidrug resistance.
abstract: Discovery of the multidrug resistance protein 1 (MDR1), an ATP-binding cassette (ABC) transporter able to transport many anticancer drugs, was a clinically relevant breakthrough in multidrug resistance research. Although the overexpression of ABC transporters such as P-glycoprotein/ABCB1, MRP1/ABCC1, and MXR/ABCG2 seems to be a major cause of failure in the treatment of cancer, acquired resistance to multiple anticancer drugs may also be multifactorial, involving alteration of detoxification processes, apoptosis, DNA repair, drug uptake, and overexpression of other ABC transporters. As a tool for the study of such phenomena, we designed and created a microarray platform, the ABC-ToxChip, to evaluate relative levels of transcriptional activation among genes involved in the various mechanisms of resistance. In the ABC-ToxChip, a comprehensive set of genes important in toxicological responses (represented by 2200 cDNA probes) is complemented with probes specifically matching ABC transporters as well as oligonucleotides representing 18,000 unique human genes. By comparing the transcriptional profiles of KB-3-1 and DU-145 parental cells with resistant derivatives selected in colchicine (KB-8-5), and 9-nitro-camptothecin (RCO.1), respectively, we demonstrate that ABC transporters (ABCB1/MDR1 and ABCC2/MRP2, respectively) show dramatic overexpression, whereas the glutathione S-transferase gene GST-Pi shows the strongest decrease in expression among the 20,000 genes studied. The results were confirmed by quantitative reverse transcription-polymerase chain reaction and immunohistochemistry. The custom-designed ABC-Tox microarray presented here will be helpful to elucidate mechanisms leading to anticancer drug resistance.
authors.affiliation: Laboratory of Cell Biology, National Cancer Institute, National Institutes of Health, Bethesda, Maryland 20892-4256, USA.
authors.forename: Jean-Philippe
authors.initials: JP
authors.lastname: Annereau
authors.forename: Gergely
authors.initials: G
authors.lastname: Szakács
authors.forename: Charles J
authors.initials: CJ
authors.lastname: Tucker
authors.forename: Angela
authors.initials: A
authors.lastname: Arciello
authors.forename: Carol
authors.initials: C
authors.lastname: Cardarelli
authors.forename: Jennifer
authors.initials: J
authors.lastname: Collins
authors.forename: Sherry
authors.initials: S
authors.lastname: Grissom
authors.forename: Barry R
authors.initials: BR
authors.lastname: Zeeberg
authors.forename: William
authors.initials: W
authors.lastname: Reinhold
authors.forename: John N
authors.initials: JN
authors.lastname: Weinstein
authors.forename: Yves
authors.initials: Y
authors.lastname: Pommier
authors.forename: Richard S
authors.initials: RS
authors.lastname: Paules
authors.forename: Michael M
authors.initials: MM
authors.lastname: Gottesman
mesh_terms: D018528:ATP-Binding Cassette Transporters / Q000235:genetics* / Q000378:metabolism; D017209:Apoptosis; D001692:Biological Transport; D002460:Cell Line; D015342:DNA Probes; D004260:DNA Repair; D018432:Drug Resistance, Multiple / Q000235:genetics*; D005091:Exons; D006801:Humans; D000089762:Multidrug Resistance-Associated Protein 2; D020411:Oligonucleotide Array Sequence Analysis
chemical_list: C000715087:ABCC2 protein, human; D018528:ATP-Binding Cassette Transporters; D015342:DNA Probes; D000089762:Multidrug Resistance-Associated Protein 2