Epigenetic gene inactivation by microRNAs (miRNAs) is crucial in malignant transformation, prevention of apoptosis, development of drug resistance, and metastasis. changes in miR-204 expression levels were also observed in vitro. Forced overexpression of miR-204 evidently attenuated docetaxel chemoresistance and promoted apoptosis in PC-3-R cells, whereas miR-204 knockdown effectively reduced docetaxel-induced cell death and inhibited cell apoptosis. Mechanistically, miR-204 directly targets the 3-untranslated region of zinc-finger E-box-binding homeobox 1 (ZEB1) and inhibits its protein expression via translational repression. Furthermore, suppression of ZEB1 could effectively improve miR-204 deficiency-triggered chemoresistance in PC cells. Our results collectively indicate that miR-204 expression is downregulated in chemoresistant PC tissues and cells and that miR-204/ZEB1 could potentially be used as adjunct therapy for patients with advanced/chemoresistant PC. Keywords: Prostate cancer, chemoresistant, docetaxel, miR-204, zinc-finger E-box-binding homeobox 1 Introduction Prostate cancer (PC) is one of the most common cancers that affects males and represents the second leading cause of cancer-related mortality . The incidence of PC has increased dramatically in China . The majority of PC-associated mortality arises from metastatic castration-resistant PC (CRPC). Although treatment with taxanes, such as docetaxel, cabazitaxel, and paclitaxel has been reported to improve survival in patients with metastatic CRPC, the prognosis of the disease remains dismal . Docetaxel is currently the first line of treatment for patients with CRPC and provides symptomatic and survival benefits over other anti-cancer agents . However, chemotherapy resistance can eventually develop through a variety of mechanisms that remain largely unclear [5,6]. In this study, we attempted to characterize the molecular mechanisms underlying docetaxel resistance in GSK1838705A manufacture individuals with Personal computer. Increasing evidence helps the part of microRNAs (miRNAs) as tumor suppressors or oncogenes. miRNAs are small, non-coding, single-stranded RNAs involved in post-translational rules of gene manifestation and have been GSK1838705A manufacture implicated in a wide range of essential biological activities . Aberrant miRNA manifestation is definitely strongly correlated with the development of chemoresistance in numerous cancers, including Personal computer . The unique part of miRNAs likely facilitates the predictive and prognostic guns of treatments, mainly because well mainly because molecular focuses on for drug resistance in Personal computer. miR-204 downregulation offers been reported in GSK1838705A manufacture Personal computer cells with respect to manifestation in normal prostate epithelial cells . Earlier studies possess also reported that miR-204 is definitely downregulated in numerous additional carcinomas, therefore suggesting a common part for miR-204 in human being tumorigenesis [10-12]. Importantly, a recent study suggested the restorative potential of miR-204 against chemoresistance of colorectal malignancy . However, the precise part of miR-204 in Personal computer and its target genes remains to become elucidated. In this study, miR-204 was found to become significantly downregulated in chemoresistant Personal computer cells and cells. MiR-204 could sensitize Personal computer cells to docetaxel and promote cell apoptosis. In addition, we recognized zinc-finger E-box-binding homeobox 1 (ZEB1) C14orf111 as a book direct target of miR-204. The ZEB1 gene encodes a zinc-finger transcription element that is definitely essential to normal embryonic development . ZEB1 manifestation offers been reported to become upregulated in epithelial cancers and demonstrated to correlate with poor Personal computer diagnosis . Oddly enough, studies possess identified that ectopic ZEB1 takes on an important part in chemoresistant prostate malignancy [16,17]. Our subsequent practical analyses showed that the miR-204/ZEB1 axis significantly influences the level of sensitivity of Personal computer cells to docetaxel. These data provide evidence that miR-204 manages docetaxel resistance by focusing on ZEB1 signaling and GSK1838705A manufacture could therefore serve as a book restorative target against Personal computer chemoresistance. Materials and methods Study populace Individuals admitted to the Urological Division of Peking Union Medical College Hospital between January 2012 and October 2015 were evaluated. The study was authorized by the Study Integrity Committee of the Peking Union Medical College Hospital, and all participants offered written knowledgeable consent. Analysis of prostate malignancy (Personal computer) was performed relating to the criteria arranged by the World Health Business. Specimens from 30 individuals with benign prostatic hyperplasia and biopsies from individuals with chemosensitive Personal computer (n=80) or chemoresistant Personal computer (n=44) were included. Individuals with chemoresistant Personal computer were defined as individuals with Personal computer who experienced tumor progression after four cycles of first-line docetaxel-based chemotherapy . The following exclusion criteria were used: >75 years of age, urinary illness, bladder stones, catheterization, and no educated consent. Clinicopathological info for all.