Long non‑coding RNA DANCR aggravates breast cancer through the miR‑34c/E2F1 feedback loop.

Emerging scientific evidence has suggested that the long non‑coding (lnc)RNA differentiation antagonizing non‑protein coding RNA () serves a significant role in human tumorigenesis and cancer progression; however, the precise mechanism of its function in breast cancer remains to be fully understood. Therefore, the objective of the present study was to manipulate expression in MCF7 and MDA‑MB‑231 cells using lentiviral vectors to knock down or overexpress . This manipulation, alongside the analysis of bioinformatics data, was performed to investigate the potential mechanism underlying the role of in cancer. The mRNA and/or protein expression levels of , and E2F transcription factor 1 () were assessed using reverse transcription‑quantitative PCR and western blotting, respectively. The interactions between these molecules were validated using chromatin immunoprecipitation and dual‑luciferase reporter assays. Additionally, fluorescence in situ hybridization was used to confirm the subcellular localization of . Cell proliferation, migration and invasion were determined using 5‑ethynyl‑2'‑deoxyuridine, wound healing and Transwell assays, respectively. The results of the present study demonstrated that DANCR had a regulatory role as a competing endogenous RNA and upregulated the expression of by sequestering in breast cancer cells. Furthermore, promoted transcription by binding to its promoter in breast cancer cells. Notably, the feedback loop enhanced cell proliferation, migration and invasion in breast cancer cells. Thus, these findings suggested that targeting may potentially provide a promising future therapeutic strategy for breast cancer treatment.