期刊论文详细信息
American Journal of Translational Research
Epigenetic silencing of miR-34a in human prostate cancer cells and tumor tissue specimens can be reversed by BR-DIM treatment
Shadan Ali1  Oudai Hassan1  Clara Hwang1  Wael A Sakr1  Dhananjay Chitale1  Fazlul H Sarkar1  Elisabeth Heath1  Nilesh Gupta1  Lance Heilbrun1  Isaac Powell1  Michael Cher1  Seema Sethi1  Dejuan Kong1  Yiwei Li1  Wei Chen1  Mani Menon1 
关键词: BR-DIM;    miR-34a;    androgen receptor (AR);    PSA;    methylation;   
DOI  :  
学科分类:医学(综合)
来源: e-Century Publishing Corporation
PDF
【 摘 要 】

Androgen Receptor (AR) signaling is critically important during the development and progression of prostate cancer (PCa). The AR signaling is also important in the development of castrate resistant prostate cancer (CRPC) where AR is functional even after androgen deprivation therapy (ADT); however, little is known regarding the transcriptional and functional regulation of AR in PCa. Moreover, treatment options for primary PCa for preventing the occurrence of CRPC is limited; therefore, novel strategy for direct inactivation of AR is urgently needed. In this study, we found loss of miR-34a, which targets AR, in PCa tissue specimens, especially in patients with higher Gleason grade tumors, consistent with increased expression of AR. Forced overexpression of miR-34a in PCa cell lines led to decreased expression of AR and prostate specific antigen (PSA) as well as the expression of Notch-1, another important target of miR-34a. Most importantly, BR-DIM intervention in PCa patients prior to radical prostatectomy showed re-expression of miR-34a, which was consistent with decreased expression of AR, PSA and Notch-1 in PCa tissue specimens. Moreover, BR-DIM intervention led to nuclear exclusion both in PCa cell lines and in tumor tissues. PCa cells treated with BR-DIM and 5-aza-dC resulted in the demethylation of miR-34a promoter concomitant with inhibition of AR and PSA expression in LNCaP and C4-2B cells. These results suggest, for the first time, epigenetic silencing of miR -34a in PCa, which could be reversed by BR-DIM treatment and, thus BR-DIM could be useful for the inactivation of AR in the treatment of PCa.

【 授权许可】

Unknown   

【 预 览 】
附件列表
Files Size Format View
RO201912140865707ZK.pdf 2700KB PDF download
  文献评价指标  
  下载次数:4次 浏览次数:0次