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Objectives  Circular RNA (circRNA) is a novel class of RNA, which exhibits powerful biological function in regulating cellular fate of various tumors. Previously, we had demonstrated that over-expression of circRNA circCDYL promoted progression of HER2-negative (HER2 – ) breast cancer  via  miR-1275-ULK1/ATG7-autophagic axis. However, the role of circCDYL in HER2-positive (HER2 + ) breast cancer, in particular its role in modulating cell proliferation, one of the most important characteristics of cellular fate, is unclear.    Materials and methods  qRT-PCR and  in situ  hybridization analyses were performed to examine the expression of circCDYL and miR-92b-3p in breast cancer tissues or cell lines. The biological function of circCDYL and miR-92b-3p were assessed by plate colony formation and cell viability assays and orthotopic animal models. In mechanistic study, circRNAs pull-down, RNA immunoprecipitation, dual luciferase report, western blot, immunohistochemical and immunofluorescence staining assays were performed.    Results  CircCDYL was high-expressed in HER2 +  breast cancer tissue, similar with that in HER2 –  breast cancer tissue. Silencing HER2 gene had no effect on expression of circCDYL in HER2 +  breast cancer cells. Over-expression of circCDYL promoted proliferation of HER2 +  breast cancer cells but not through miR-1275-ULK1/ATG7-autophagic axis. CircRNA pull down and miRNA deep-sequencing demonstrated the binding of miR-92b-3p and circCDYL. Interestingly, circCDYL did not act as miR-92b-3p sponge, but was degraded in miR-92b-3p-dependent silencing manner. Clinically, expression of circCDYL and miR-92b-3p was associated with clinical outcome of HER2 +  breast cancer patients.    Conclusion  MiR-92b-3p-dependent cleavage of circCDYL was an essential mechanism in regulating cell proliferation of HER2 +  breast cancer cells. CircCDYL was proved to be a potential therapeutic target for HER2 +  breast cancer, and both circCDYL and miR-92b-3p might be potential biomarkers in predicting clinical outcome of HER2 +  breast cancer patients.

MiR-92b-3p Inhibits Proliferation of HER2-Positive Breast Cancer Cell by Targeting circCDYL