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-1417 - Transcription profiling by array of HeLa cells treated with camptothecin
Released on 29 July 2007, last updated on 29 April 2015
Pharmacogenomic identification of targets for adjuvant therapy with the topoisomerase poison camptothecin. The response of tumor cells to the unusual form of DNA damage caused by topoisomerase poisons such as camptothecin (CPT) is poorly understood, and knowledge regarding which drugs can be effectively combined with CPT is lacking. To better understand the response of tumor cells to CPT and to identify potential targets for adjuvant therapy, we examined global changes in mRNA abundance in HeLa cells after CPT treatment using Affymetrix U133A GeneChips, which include all annotated human genes (22,283 probe sets). Statistical analysis of the data using a Bayesian/Cyber t test and a modified Benjamini and Hochberg correction for multiple hypotheses testing identified 188 probe sets that are induced and 495 that are repressed 8 h after CPT treatment at a False Discovery Rate of <0.05 and a minimum 3-fold change. This pharmacogenomic approach led us to identify two pathways that are CPT induced: (a) the epidermal growth factor receptor; and (b) nuclear factor-kappaB-regulated antiapoptotic factors. Experiments using HeLa cells in our lab and prior animal model studies performed elsewhere confirm that inhibitors of these respective pathways super-additively enhance CPT's cytotoxicity, suggesting their potential as targets for adjuvant therapy with CPT. Cancer Res. 2004 Mar 15;64(6):2096-104
transcription profiling by array, compound treatment design
Pharmacogenomic identification of targets for adjuvant therapy with the topoisomerase poison camptothecin. Jonathan P Carson, Nianyi Zhang, Garrett M Frampton, Norman P Gerry, Marc E Lenburg, Michael F Christman.