MicroRNA‑543 inhibits the proliferation, migration, invasion, and epithelial‑mesenchymal transition of triple‑negative breast cancer cells via down‑regulation of ACTL6A gene

• Y. L. Wang ^[1] ; R. H. Liang ^[1] ; C. Y. Wang ^[1] ; R. P. Zhang ^[1] ; S. Y. Wu ^[1] ; X. Han ^[2] ; G. L. Zhang ^[2]
  1. [1] Department of Medical Oncology, Baotou Cancer Hospital, Baotou 014030, Inner Mongolia, China
  2. [2] Department of Breast Surgery, Baotou Cancer Hospital, No. 18 Tuanjie Street, Qingshan District, Baotou 014030, Inner Mongolia, China
• Localización: Clinical & translational oncology, ISSN 1699-048X, Vol. 24, Nº. 1 (Enero), 2022, págs. 84-92
• Idioma: inglés
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• Resumen

  • Purpose To investigate the efect of microRNA-543 (miR-543) on the proliferation, migration, invasion, and epithelialmesenchymal transition (EMT) of triple-negative breast cancer (TNBC) cells, and the associated mechanism.

    Methods Human breast cancer cells (MDA-MB-231, HCC1937, and MCF-7, ZR-75–1) and normal human breast epithelial cell line (MCF10A) were transfected with miR-543 mimics or inhibitor using lipofectamine 2000. Quantitative reverse transcription polymerase chain reaction (qRT-PCR) and Western blotting were used to determine the mRNA and protein expression levels of miR-543, actin-like protein 6A (ACTL6A), vimentin, Snail, and E-cadherin in breast cancer cells/tissue.

    Cell counting kit-8 (CCK-8), wound-healing, and Transwell assays were used to measure the efect of miR-543 on TNBC cell proliferation, invasion, and migration. Overall survival was determined using data from Gene Expression Omnibus (GEO) and Cancer Genome Atlas (TCGA) databases. Bioinformatics analysis and luciferase reporter gene assay were used to determine the regulatory efect of miR-543 on ACTL6A.

    Results The level of expression of miR-543 was signifcantly lower in breast cancer cells/tissue than in normal human breast epithelial cell/tissue (p<0.05). MicroRNA-543 expression level was signifcantly reduced in TNBC cells/tissue, relative to the other breast cancer cells/normal breast tissue (p<0.05). MicroRNA-543 signifcantly suppressed tumor growth and the proliferation, migration, invasion, and epithelial–mesenchymal transition (EMT) of TNBC cells, in mouse xenograft model (p<0.05).

    Conclusions miR-543 infuences the biological behavior of TNBC cells by directly targeting ACTL6A gene. miR-543 could serve as a novel diagnostic and therapeutic target for TNBC.