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MicroRNA (miR)‑145 has been demonstrated to act as a tumor suppressor, and deregulation of fascin 1 (FSCN1) has been observed in several types of human malignancy, including gastric carcinoma. However, the molecular mechanism underlying the function of miR‑145, specifically its targets in gastric carcinoma have yet to be fully elucidated. In the present study, downregulation of miR‑145 and upregulation of FSCN1 was identified in gastric carcinoma cell lines, compared with normal gastric mucosal epithelial cells. A luciferase reporter assay demonstrated that miR‑145 was able to bind to the 3'‑untranslated region of FSCN1 mRNA. Overexpression of miR‑145 led to a significant decrease in FSCN1 expression levels, whereas knockdown of miR‑145 resulted in increased FSCN1 expression levels in gastric carcinoma cells. Furthermore, overexpression of miR‑145 inhibited proliferation, migration and invasion in gastric carcinoma cells. Similar effects were also observed in gastric carcinoma cells transfected with FSCN1 small interfering RNA. In addition, overexpression of FSCN1 reversed the suppressive effects of miR‑145 upregulation on proliferation, migration and invasion in gastric carcinoma cells, suggesting that FSCN1 is indeed involved in the miR‑145‑mediated malignant phenotype of gastric carcinoma cells. The present study revealed an anti‑oncogenic role of miR‑145 in gastric carcinoma via inhibition of FSCN1, and suggested that miR‑145 may be used for the treatment of gastric carcinoma.

MicroRNA-145 inhibits the malignant phenotypes of gastric carcinoma cells via downregulation of fascin 1 expression