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microRNA-1228(⁎) impairs the pro-angiogenic activity of gastric cancer cells by targeting macrophage migration inhibitory factor.

Life Sci.2017 Jul 01;180:9-16. Epub 2017 Apr 29
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摘要


Our previous study has shown that microRNA-1228(⁎) (miR-1228(⁎)) is downregulated in gastric cancer tissues and restoration of its expression retards tumor growth in a gastric cancer xenograft model. In this work, we aimed to explore the role of miR-1228(⁎) in gastric cancer cell cycle progression and angiogenesis and to identify its functional target gene(s). It was found that miR-1228(⁎) overexpression significantly inhibited the proliferation and colony formation of gastric cancer cells, compared to vector-transfected cells. As determined by propidium iodide staining, overexpression of miR-1228(⁎) resulted in an enrichment of G0/G1 phase cells in gastric cancer cells. miR-1228(⁎)-overexpressing cells showed a significant reduction of vascular endothelial growth factor expression and secretion. Conditioned media from miR-1228(⁎)-overexpressing cells showed a reduced capacity to promote endothelial cell migration and tube formation. Mechanistically, macrophage migration inhibitory factor (MIF) was identified as a direct target gene of miR-1228(⁎). Enforced expression of MIF rescued gastric cancer cells from miR-1228(⁎)-mediated suppression of proliferation and angiogenesis. In vivo xenograft mouse studies further demonstrated that co-expression of MIF with miR-1228(⁎) in gastric cancer cells significantly restored tumor growth and increased microvascular density. Taken together, miR-1228(⁎) acts as a negative regulator of gastric cancer growth and angiogenesis through downregulation of MIF. This work suggests miR-1228(⁎) as a potential target for anti-angiogenic therapy against gastric cancer.

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