Please note that we have stopped the regular imports of Gene Expression Omnibus (GEO) data into ArrayExpress. This may not be the latest version of this experiment.

E-GEOD-12791 - Paclitaxel resistant MDA-MB-231 Cells and resensitization with bexarotene treatment

Released on 18 July 2011, last updated on 6 August 2015
Homo sapiens
Samples (16)
Array (1)
Protocols (8)
Acquired drug resistance represents a major challenge in chemo-therapy treatment for various types of cancers. We have found that the retinoid X receptor–selective agonist bexarotene (LGD1069, Targretin) was efficacious in treating chemo-resistant cancer cells. The goal of this microarray study was to understand the mechanism of bexarotene’s role in overcoming acquired drug resistance using human breast cancer cells MDA-MB-231 as a model system and paclitaxel as model compound. After MDA-MB-231 cells were repeatedly treated with paclitaxel for 8 cycles with each cycle including a 3-day treatment with 30 nM paclitaxel and followed by a 7-day exposure to control medium, MDA cells resistant to paclitaxel were developed and their growth was no longer inhibited by paclitaxel treatment. Those MDA cells with acquired drug resistance, when treated with paclitaxel and bexarotene in combination, could regain their sensitivity and their growth were again inhibited. Therefore, RNA samples from parental MDA-MB-231 cells, paclitaxel-resistant MDA cells treated with vehicle, paclitaxel alone or in combination with bexarotene, were used for perform global gene expression profiling with Affymetrix HG-U133A gene chips. Keywords: Drug Treatment MDA-MB-231 cells were exposed to regimens on a 10-day cycle: a 3-day treatment with 30 nM paclitaxel and followed by a 7-day exposure to control medium. Paclitaxel resistant MDA-MB-231 cells (MDA-PR) were established within 8 cycles of such treatment (80 days). These MDA-PR cells were then treated with vehicle control, paclitaxel along, or the combination of 30 nM paclitaxel ( 3 days on and 7 days off) and 1 µM Targretin (10 days on) in a new 10-day cycle for 3 months. Thus, there are four treatment groups, parent MDA cells, MDA-PR, MDA-PR treated with paclitaxel, MDA-PR treated with paclitaxel and bexarotene, and each group had four biological replicates.
Experiment type
transcription profiling by array 
Wen Luo <>, Jenifer M Sanders, Thomas W Hermann
Identification of Polymorphisms Associated with Hypertriglyceridemia and Prolonged Survival Induced by Bexarotene in Treating Non-small Cell Lung Cancer. Luo W, Schork NJ, Marschke KB, Ng SC, Hermann TW, Zhang J, Sanders JM, Tooker P, Malo N, Zapala MA, Dziewanowska ZE, Negro-Vilar A, Meglasson MD.
Investigation descriptionE-GEOD-12791.idf.txt
Sample and data relationshipE-GEOD-12791.sdrf.txt
Raw data (1)
Processed data (1)
Array designA-AFFY-33.adf.txt