Abstract
We previously reported that CD133, as a putative cancer stem cell marker, plays an important role in cell proliferation and invasion in colon cancer. To understand the role of CD133 expression in colon cancer, we evaluated the inhibitory effect of CD133 in colon cancer cells. In this study, we generated CD133knockout colon cancer cells (LoVo) using the CRISPR-Cas9 gene editing system. CD133+ colon cancer cells (LoVo) were infected with the lentiviral vector carrying CD133 gRNA and purified cell by culturing single cell colonies. CD133knockout cells was validated by western blot and flow cytometry analysis. In functional study, we observed a significant reduction in cell proliferation and colony formation in CRISPR-Cas9 mediated CD133 knockout cells in compare with control (P < 0.001). We also found the anticancer effect of stattic was dependent on CD133 expression in colon cancer cells. Although CD133knockout cells could not completely block the tumorigenic property, they showed remarkable inhibitory effects on the ability of cell migration and invasion (P < 0.001). In addition, we examined the epithelial mesenchymal transition (EMT)-related protein expression by western blot. The result clearly showed a loss of vimentin expression in CD133knockout cells. Therefore, CRISPR-Cas9 mediated CD133knockout can be an effective treatment modality for CD133+ colon cancer through reducing the characteristics of cancer stem cells.
Highlights
Cancer stem cells (CSCs) are considered to be small subsets of tumor cells which exhibit stemcell-like characteristics and are closely related to self-renewal, tumorigenesis, multi-directional differentiation potential, metastasis initiation, and therapeutic resistance [1]
CD133 expression was reported to be related with poor prognosis, metastasis, and recurrence in colon cancer [6]
Inhibition of self-renewal and cell proliferation in CD133knockout colon cancer cells were related to decreased survivin
Summary
Cancer stem cells (CSCs) are considered to be small subsets of tumor cells which exhibit stemcell-like characteristics and are closely related to self-renewal, tumorigenesis, multi-directional differentiation potential, metastasis initiation, and therapeutic resistance [1]. Identification of different subgroups of CSCs by using the expression of cell surface antigens (surface markers) is the most convincing method today [2]. These cancer stem cell markers play an important role in biological functions [3]. CD133 expression was reported to be related with poor prognosis, metastasis, and recurrence in colon cancer [6].
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