Expression profiling of microRNAs and Hsa-miR-145 targets in human prostate cancer

Prostate cancer is one of the most significant cancers of the men and there is a need to identify novel therapeutic approaches in this disease. MicroRNAs are small, approximately 18?24 nucleotides, non-coding, endogenously synthesized new class of small RNAs as regulators of gene expression post-transcriptionally. Alteration in microRNA expression may play a critical role in pathogenesis of the disease and its gain of androgen independency. Recurrence is one of the main problems in prostate cancer therapy due to lack of understanding the mechanism and insufficient treatment options. Global microRNA expression studies revealed the key regulatory microRNAs in prostate cancer. It was shown that human prostate cancer possess a widespread deregulation of microRNA expression and hsa-miR-145 is down regulated in prostate tumors as compared to normal prostatic tissues. Hsa-miR-145 is also down-regulated in prostate cancer cell lines including PC3, DU145, LNCaP and LAPC4 but has relatively higher expression in normal prostatic epithelial cells. The microRNA expression profiling studies between recurrent and non-recurrent prostate cancer samples suggest that there is not a widespread change but expression of some microRNAs is significantly altered.