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  • Title: Enhanced expression of circular RNA circ-DCAF6 predicts adverse prognosis and promotes cell progression via sponging miR-1231 and miR-1256 in gastric cancer.
    Author: Wu L, Liu D, Yang Y.
    Journal: Exp Mol Pathol; 2019 Oct; 110():104273. PubMed ID: 31226266.
    Abstract:
    Circular RNAs (circRNAs) have been reported as essential regulators in various malignancies, including gastric cancer (GC). Previously, circ-DCAF6 was screened as an elevated circRNA in GC patients' tissue samples compared with the normal tissues. To our knowledge, the role of circ-DCAF6 in human cancers is still needed to reveal. The present project is to evaluate the functions and mechanisms of circ-DCAF6 in GC progression. Upregulation of circ-DCAF6 was determined in GC tissue samples and cells by qRT-PCR. Enhanced level of circ-DCAF6 was linked to deeper tumor invasion, positive lymph node metastasis, and higher TNM stages in GC patients. Multivariate analysis further indicated circ-DCAF6 as an independent prognostic indicator. Functionally, CCK-8, clone forming, flow cytometry and transwell assays verified that circ-DCAF6 played as an oncogene in GC cells. Mechanistically, we found the negative correlation between circ-DCAF6 and miR-1231/-1256 in GC specimens. Moreover, luciferase reporter gene assay illustrated that miR-1231 and miR-1256 could be bound to circ-DCAF6. Rescue experiments revealed that circ-DCAF6 facilitated cell growth and invasion via suppressing the levels of miR-1231 and miR-1256. To sum up, circ-DCAF6 acts as an important role in GC tumor progression, and high circ-DCAF6 level may be a useful biomarker for GC.
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