Effect of MPC309 (AR-targeting Multivalent Peptoid Conjugate) treatment on gene expression in LNCaP-ABL cells (castration-resistant prostate cancer cell line) in comparison to Vehicle control and another AR ligand, Ethisterone (partial agonist): ATAC-Seq

We conducted ATAC-seq on LNCaP-abl cells treated overnight with either vehicle (DMSO), MPC309, Backbone, DHT or Enzalutamide to reveal areas of accessible chromatin. Our results indicated that the vast majority of peaks (>46,000) were shared among all groups. Notwithstanding, MPC309 incited some chromatin restructuring, as evidenced by the unique 8,750 open chromatin sites seen in cells treated with MPC309 as opposed to those treated with the vehicle. Analysis of transcription factor (TF) binding-motifs around regions of chromatin exclusively open in MPC309-treated cells exposed NR-binding motifs (GRE, PRE, ARE, AR-half sites). This indicates the potential for MPC309-bound AR to interact with chromatin at AR-specific locations. Overall design: LNCaP-abl cells were cultured under androgen deprivation and treated with vehicle (DMSO), 1µM backbone, 1µM MPC309, 10nM DHT, or 10µM enzalutamide overnight, and ATAC-seq performed. Accessible chromatin profiling analysis was performed using the Rosalind software.