248 S Kumari, D Senapati et al. New approaches to inhibit 24:8 R275–R295 Review AR action Rationale for the development of alternative forms of androgen deprivation therapy Sangeeta Kumari1,*, Dhirodatta Senapati1,* and Hannelore V Heemers1,2,3 1Department of Cancer Biology, Cleveland Clinic, Cleveland, Ohio, USA Correspondence 2Department of Urology, Cleveland Clinic, Cleveland, Ohio, USA should be addressed 3Department of Hematology/Medical Oncology, Cleveland Clinic, Cleveland, Ohio, USA to H V Heemers *(S Kumari and D Senapati contributed equally to this work) Email
[email protected] Abstract With few exceptions, the almost 30,000 prostate cancer deaths annually in the United Key Words States are due to failure of androgen deprivation therapy. Androgen deprivation f androgen receptor therapy prevents ligand-activation of the androgen receptor. Despite initial remission f prostate cancer after androgen deprivation therapy, prostate cancer almost invariably progresses while f nuclear receptor continuing to rely on androgen receptor action. Androgen receptor’s transcriptional f coregulator output, which ultimately controls prostate cancer behavior, is an alternative therapeutic f transcription target, but its molecular regulation is poorly understood. Recent insights in the molecular f castration mechanisms by which the androgen receptor controls transcription of its target genes f hormonal therapy are uncovering gene specificity as well as context-dependency. Heterogeneity in the Endocrine-Related Cancer Endocrine-Related androgen receptor’s transcriptional output is reflected both in its recruitment to diverse cognate DNA binding motifs and in its preferential interaction with associated pioneering factors, other secondary transcription factors and coregulators at those sites. This variability suggests that multiple, distinct modes of androgen receptor action that regulate diverse aspects of prostate cancer biology and contribute differentially to prostate cancer’s clinical progression are active simultaneously in prostate cancer cells.