Androgen receptor (AR) signaling is a primary oncogenic driver of castration-resistant prostate cancer (CRPC), yet the mechanism remains incompletely understood. Dysregulation of the AR co-regulatory network has emerged as a key driver of castration resistance. To identify AR-interacting proteins linked to CRPC progression, we performed proteomics-based rapid immunoprecipitation of endogenous proteins (RIME) analysis targeting AR in the CRPC cell line C4-2B.