Colon cancer stem cells (CCSCs) stand for a critical subpopulation of colon cancer cells that possess self-renewal and multilineage differentiation potentials and drive tumorigenicity. Due to their impact on treatment tolerance, CCSCs have been a hot research topic in the past few years. We have previously reported that miR-139-5p is a vital tumor repressive noncoding RNA whose level decreases in the clinical colon cancer samples with the increase of tumor malignancy. This research discovered that miR-139-5p targets the Wnt/β-catenin/TCF7L2 downstream effector E2-2 in CCSCs. E2-2 is a pivot molecule in the negative feedback loop of miR-139-5p/Wnt/β-catenin/TCF7L2. Its small interfering RNA reverses the stemness maintenance and epithelial-mesenchymal transition of colon cancer CSCs. This study provides a theoretical foundation for the clinical diagnosis and medical treatment of recurrent or metastatic colon cancer with miR-139-5p and its target E2-2.
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