4.7 Article

Circular RNA 000554 represses epithelial-mesenchymal transition in breast cancer by regulating microRNA-182/ZFP36 axis

Journal

FASEB JOURNAL
Volume 34, Issue 9, Pages 11405-11420

Publisher

WILEY
DOI: 10.1096/fj.201903047R

Keywords

breast cancer; circular RNA 000554; epithelial-to-mesenchymal transition; microRNA-182; ZFP36

Funding

  1. Natural Science Doctoral Funding of Shandong Province [ZR2017BH061, ZR2018BH023, ZR2019BH013]
  2. Qingdao Science and Technology Innovation Plan [17-1-1-54-jch]
  3. Qingdao University
  4. Qingdao University Affiliated Hospital

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Increasing evidence indicates that circular RNAs (circRNAs) play a crucial role in regulating microRNAs (miRs) and mRNAs during breast cancer (BC) progression. Based on the in silico analysis of circRNA/miR/mRNA in BC, we aim to define an important role of circRNA_000554 in BC in relation to miR-182 and zinc finger protein 36 (ZFP36). Low expression of circRNA_000554 and ZFP36, and high miR-182 expression were determined in the clinical BC tissues. CircRNA_000554 acted as a sponge of miR-182, and miR-182 directly targeted ZFP36. After that, in order to evaluate the effects of circRNA_000554, miR-182, and ZFP36 on cellular process, we evaluated in vitro epithelial-mesenchymal transition (EMT) and in vivo tumor growth after delivering a series of overexpression plasmids, mimic, inhibitor, or shRNAs into BC cells. Increasing circRNA_000554 suppressed EMT, cell invasion and migration during BC by depleting miR-182 and increasing ZFP36. The inhibitory effect of circRNA_000554 on tumor growth was validated in vivo. Taken together, the present study confirms that circRNA_000554 functioned as an inhibitor of EMT in BC and suggests a molecular mechanism that circRNA_000554 bound to miR-182 to upregulate ZFP36 in this process.

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