LINC01006 influences cell proliferation, apoptosis, migration and invasion by targeting miR-34a-5p/DAAM1 in prostate cancer

Abstract

Background: Large quantities of researches have demonstrated that long noncoding RNAs (lncRNAs) exert crucial function in the development of human cancers by acting as oncogenes or tumor suppressors. LINC01006 was once found to have oncogenic function in pancreatic cancer. However, its role is still unclear in prostate cancer (PCa).Methods: RT-qPCR assay examined LINC01006, miR-34a-5p, DAAM1 expression in PCa cells. RNA pull down and luciferase reporter assay were used to certify the relationship between LINC01006 and its downstream targets.Results: LINC01006 was discovered to be remarkably high in PCa cell lines. Moreover, the functional assay validated that LINC01006 silence hindered proliferation, migration and invasion as well as accelerated apoptosis in PCa cells. The results of nucleus cytoplasm fractionation and FISH assay revealed that LINC01006 had the possibility to modulate downstream targets in ceRNA mechanism. MiR-34a-5p was selected out to be low expressed in PCa cell lines. In addition, miR-34a-5p up-regulation restricted proliferative, migratory and invaded capacities while facilitated apoptosis in PCa cells. DAAM1 was determined to be negatively regulated by miR-34a-5p. More interestingly, DAAM1 knockdown had inhibitory effects on PCa cells. Eventually, data of rescue assays exhibited that overexpression of DAAM1 countervailed the suppressive impacts of LINC01006 down-regulation on PCa progression.Conclusions: LINC01006 was an oncogene in PCa by targeting miR-34a-5p/DAAM1, which offered a novel insight for treating PCa.