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  • Title: Upregulated miR-221/222 promotes cell proliferation and invasion and is associated with invasive features in retinoblastoma.
    Author: Liu H, Cao B, Zhao Y, Liang H, Liu X.
    Journal: Cancer Biomark; 2018; 22(4):621-629. PubMed ID: 29843209.
    Abstract:
    BACKGROUND AND OBJECTIVES: MicroRNA (miR-221/222) is frequently overexpressed in many cancers and is associated with poor prognosis. However, the role of miR-221/222 in retinoblastoma (RB) remains unclear. This study aimed to detect the clinical significance of miR-221/222 in RB patients and explore its role in RB cells in vitro. METHODS: Expression of miR-221/222 was assessed in fresh RB tissue collected from 64 eyes and normal retinal tissues from 18 unrelated donor cadaver eyes by quantitative real time RT-PCR analysis (qRT-PCR), and correlated with the histopathological findings. Human RB Y79 cells were transfected with miR-221/222 precursors or inhibitors to overexpress or downregulate miR-221/222 expression, respectively, using Lipofectamine 2000 reagent. The biological effects of miR-221/222 were then assessed by cell viability assays, colony formation assays, apoptosis detection assays, Matrigel® invasion assays, and wound-healing assays. RESULTS: Higher miR-221/222 expression was detected in RB tissues compared to that of the normal retinal tissues (p< 0.001). Higher miR-221/222 expression was correlated with invasion in patients with RB. Targeting of miR-221/222 induced apoptosis and inhibited Y79 cell proliferation, migration, and invasion in vitro. However, overexpression of miR-221/222 promoted Y79 cell proliferation, migration, and invasion in vitro. CONCLUSIONS: Overexpression of miR-221/222 was associated with tumor invasiveness in patients with RB. The miR-221/222 cluster might be used as a potential therapeutic strategy in clinical practice.
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