Özet:

Objective: Prostate cancer accounts for approximately 10% of new cases diagnosed in men worldwide. Toll like receptors (TLRs) play a crucial role in the progression of cancer. Furthermore, the expression level of TLRs is mediated by different transcription factors and non-coding RNAs. Therefore, the aim of this study was to investigate the potential regulatory role of MEG3 and the interaction of TLR3 with MEG3 in the prostate cancer cells. Materials and Methods: In this study, PC-3, LNCaP and HUVEC cells were used. To stimulate TLR3 expression, Poly I:C was used for a ligand of TLR3 and the less cytotoxic concentration of Poly I:C was determined by WST-1 analysis. The relative gene expression levels of TLR3 and MEG3 were analyzed by RT-PCR. Results: According to the results, 5 µM of Poly I:C was chosen as a less cytotoxic concentration for the stimulation of TLR3 activity. The mRNA level of MEG3 (3.19-, 1.90-, and 1.90-fold) and TLR3 (6.17-, 5.75- and 2.27-fold) was significantly increased in PC-3, LNCaP and HUVEC cells, respectively after Poly I:C stimulation (p<0.05). Additionally, the expression level of MEG3 was 2.33- and 10.93-fold for PC-3 and LNCaP cells respectively, compared to HUVEC cells (p<0.05). Conclusion: In conclusion, the activation of the TLR3 signaling pathway through Poly I:C promoted the level of MEG3 expression especially in castration-resistant prostate cancer cells. Thus, our preliminary data suggests that MEG3 could modulate TLR3 signaling pathway in prostate cancer cells.

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