MicroRNAs are short non-coding RNA sequences that that can modify genes in post transcriptional manner and are often de-regulated in cancer. Cancer stem cells, a subset of cancer cells with stem cell properties, are considered the root of tumorigenesis and seeds of metastasis. In this study we are interested in elucidating the role of miR-206 in breast cancer stem cell-mediated tumorigenesis and metastasis. We have observed that microRNA-206 (miR-206) regulate the metastatic traits of breast cancer cells, both in vitro and in vivo. Our studies have elucidated a signaling cascade that culminates in the silencing of cytokine (such as interleukin) and integrin expression. Knockdown of the interleukin and integrin genes by siRNAs mimics the phenotype of miR-206 expression in breast cancer cells. DNA content analysis using propidium iodide staining revealed that knockdown of miR-206 targets as well as over-expression of miR-206 in MDA-MB-231 cells regulates cell cycle arrest. Our results indicate that miR-206 mediates its regulatory effects through inhibiting multiple targets. MiR-206 may serve as a new therapeutic candidate for the future treatment of breast cancer.

Citation Format: Valery Adorno-Cruz, Huiping Liu. Understanding the role of microRNA-206 in breast cancer. [abstract]. In: Proceedings of the 107th Annual Meeting of the American Association for Cancer Research; 2016 Apr 16-20; New Orleans, LA. Philadelphia (PA): AACR; Cancer Res 2016;76(14 Suppl):Abstract nr 1894.