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Androgen Receptor in Telomeres DNA and Chromosomes
Androgen receptor (AR) plays a role in maintaining telomere stability in prostate cancer cells, as AR inactivation induces telomere dysfunction within 3 h. Since telomere dysfunction in other systems is known to activate ATM (ataxia telangiectasia mutated)-mediated DNA damage response (DDR) signaling pathways, we investigated the role of ATM-mediated DDR signaling in AR-inactivated prostate cancer cells. Indeed, the induction of telomere dysfunction in cells treated with AR-antagonists (Casodex or MDV3100) or AR-siRNA was associated with a dramatic increase in phosphorylation (activation) of ATM and its downstream effector...
Source: Journal of Biological Chemistry - October 16, 2015 Category: Chemistry Authors: Reddy, V., Wu, M., Ciavattone, N., McKenty, N., Menon, M., Barrack, E. R., Reddy, G. P.-V., Kim, S.-H. Tags: Cell Biology Source Type: research

A hormone-dependent feedback-loop controls androgen receptor levels by limiting MID1, a novel translation enhancer and promoter of oncogenic signaling
Conclusion: Promotion of AR, in addition to enhancement of the Akt-, NFkappaB-, and Hh-pathways by sustained MID1-upregulation during androgen deprivation therapy provides a powerful proliferative scenario for PCa progression into castration resistance. Thus MID1 represents a novel, multi-faceted player in PCa and a promising target to treat castration resistant prostate cancer.
Source: Molecular Cancer - June 9, 2014 Category: Cancer & Oncology Authors: Andrea KöhlerÜmmühan DemirEva KicksteinSybille KraussJohanna AignerBeatriz Aranda-OrgillésAntonios KaragiannidisClemens AchmüllerHuajie BuAndrea WunderlichMichal-Ruth SchweigerGeorg SchaeferSusann SchweigerHelmut KlockerRainer Schneider Source Type: research