Figure 5. Cell cycle progression activity and E2F1 expression are inversely associated with AR activity.
(a) CCP scores are inversely associated with AR activity scores as determined by the expression levels of 21 AR-regulated genes in 171 tumors (r = −0.36, P < 0.001).
(b) Inverse association between CCP scores and AR activity scores was also observed in the Grasso et al. dataset of 35 CRPC tumors (r = −0.42, P = 0.01).
(c) AR activity is inversely associated with E2F1 transcript expression in 171 tumors (r = −0.43, P < 0.001).
(d) AR expression level influences cellular responses to the AR ligand R1881. Representative Western blot (n = 2) of AR and GAPDH protein levels in wild type LNCaP cells and LNCaP-AR cells engineered to overexpress AR (rAR) (left panel). LNCaP and LNCaP-AR cell growth measured 72 h after exposure to the indicated R1881 concentration, n = 4 in each group (right panel).