Integrative transcriptional analysis of enzalutamide-resistant castration resistant prostate cancer cells using RNA sequencing.

284Background: Enzalutamide (ENZ)-resistance is a clinically challaengeable issue for management of castration-resistant prostate cancer (CRPC) patients. Here, we aimed to investigate the distinct features of transcriptional expression in ENZ-resistant CRPC cells using RNA sequencing, focusing on the histone modification enzymes as AR co-regulators. Methods: We chronically treated various concentration of ENZ (1 to 40 µM) for 6 to 9 months to establish ENZ-resistant CRPC cells by using C4-2B cells. To explore the phenotypic features of ENZ-resistant CRPC cells (ENZ-R), we analyzed the gene expression patterns, particularly AR target genes, following ENZ treatment. We performed cell viability assay, clonogenic assay, apotosis assay and tumor sphere formation assay. To examine the distinct features of transcriptional expression in ENZ-resistant CRPC cells, we conducted RNA sequencing and classified the key differential expression genes (DEG) according to Gene Ontology Database. Results: ENZ-R cells showed a...