Cell proliferation was measured from the absorbance (optical density, OD) of 450 nm wavelengths. However, the relationship between AR and miR-124 is definitely unclear. In the present study, we found a negative opinions loop between AR and miR-124 manifestation. On one hand, miR-124 was a positively controlled target gene of the AR, on the other hand, overexpression of miR-124 inhibited the manifestation of AR. In addition, we found that miR-124-2 and miR-124-3 promoters were hypermethylated in AR-negative PCa cells. Furthermore, overexpression of miR-124 inhibited proliferation rates and invasiveness capacity of PCa cells and xenograft assays Six weeks aged male BALB/C nude mice (SLAC, Shanghai, China) were randomly grouped and subcutaneously injected with 4x 106 LNCaP-control or LNCaP-miR-124 cells mixed with an equal volume of matrigel (BD Biosciences, Bedford, MA, USA). Each group experienced at least five mice. Tumors were measured having a caliper every 10 days from 2 weeks after inoculation and the volume was determined as /6 size width2. Xenograft tumors were excised and weighed at sacrifice on 34 day time post-tumor cell injection. All mouse experiments were authorized by the Renji hospital animal care and use committee. Statistical analysis Data were analyzed using the SPSS 13.0 softwares (SPSS Inc., Chicago, Ill., USA) and Prism GraphPad 5 (GraphPad Software, La Jolla, Calif., USA). Statistical analysis was performed using the College students t-test. Data are offered as the means SEM from at least three independent experiments. Probability values less than 0.05 were considered significant. Results A negative opinions loop between miR-124 and AR manifestation To NXY-059 (Cerovive) determine whether AR regulates manifestation of miR-124 in PCa cell lines, AR overexpression and AR knockdown experiments were performed in Personal computer3 cells (vs. Personal computer3/AR) and LNCaP cells (vs. LNCaP-sh-AR), respectively. As demonstrated in Fig. 1, while overexpression of the AR in Personal computer3 cells enhanced expression level of miR-124 (Fig. 1A), knockdown of AR in LNCaP cells reduced the expression level of miR-124 (Fig. 1B). Furthermore, Cd22 we examined if miR-124 is an androgen responsive microRNA. LNCaP cells, androgen-responsive PCa cells, were plated in androgen-free medium and treated with DHT for 0 nM, 1 nM and 10 nM, respectively. After 12 hour, the RNAs were extracted and real time PCR was analyzed. These experiments exposed an increase for the manifestation amounts levels of miR-124 gene in LNCaP cells treated with DHT (10 nM) treatment (Fig. 1C). Above results suggesting that AR is definitely closely positively correlated with the manifestation of miR-124. However, it is not clear whether there exists a opinions influence between miR-124 and AR. To study this probability, LNCaP cells were infected having a control lentivirus (LNCaP-control cells) or plenti-CMV-mir-124 lentivirus (LNCaP-miR-124 cells) which expresses high levels of miR-124 (Fig. 1D). Manifestation level of AR was then analyzed by qRT-PCR. As demonstrated in Fig. 1E, overexpression of miR-124 significantly inhibited AR mRNA level, which is consistent with a earlier study reporting that treatment with miR-124 resulted in a reduction NXY-059 (Cerovive) of AR protein in LNCaP cells . Taken together, these results suggested a negative opinions NXY-059 (Cerovive) loop between miR-124 and AR manifestation (Fig. 1F). Open in a separate windows Fig 1 A Negative Opinions Loop Between MiR124 and AR Manifestation.(A) PC3/AR cells are a stable cell line overexpressing human being AR cDNA; Personal computer3/neo cells are used like a control. (B) LNCaP-sh-AR cells are AR-knockdown cells, in which LNCaP cells were infected with lentivious AR shRNA; LNCaP-sh-control cells are used like a control. (C) 0 nM, 1 nM and 10 nM DHT were added to LNCaP cells and cultured for 12 hour. (D) LNCaP cells were infected having a control lentivirus (LNCaP-control cells) or plenti-CMV-mir-124 lentivirus (LNCaP-miR-124 cells). Relative manifestation of miR-124 in LNCaP cells.