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Medical Science Monitor Basic Research


eISSN: 1643-3750

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MiR-769 Inhibits Colorectal Cancer Cell Proliferation and Invasion by Targeting HEY1

Chao Han, Yingming Song, Changhong Lian

(Department of General Surgery, Peace Hospital Affiliated to Changzhi Medical College, Changzhi, Shanxi, China (mainland))

Med Sci Monit 2018; 24: LBR9232-9239

DOI: 10.12659/MSM.911663

BACKGROUND: MicroRNAs (miRNAs) have been widely recognized as essential regulators in human cancers, including colorectal cancer (CRC). Whether miR-769 is implicated in CRC progression remains elusive. The present study aimed to determine the function of miR-769 in CRC.
MATERIAL AND METHODS: MiR-769 expression in CRC tissues and adjacent normal tissues were measured by quantitative real-time polymerase chain reaction (qRT-PCR) and in situ hybridization. Kaplan-Meier curve analysis was utilized to determine the association between miR-769 expression and prognosis in CRC patients. The effects of miR-769 overexpression on CRC cell proliferation, cell cycle and invasion were analyzed using Cell Counting Kit-8 (CCK8), fluorescence activated cell sorting (FACS), and Transwell assays. Western blot was utilized to assess the effect of miR-769 on HEY1 expression.
RESULTS: MiR-769 expression was decreased in CRC tissues. MiR-769 level was negatively correlated with the prognosis of CRC patients. Additionally, miR-769 overexpression remarkably inhibited cell proliferation, arrested CRC cells in G0 stage, and reduced cellular invasion. As to the mechanism, HEY1 was a direct target of miR-769; HEY1 level was inversely correlated with that of miR-769 in CRC tissues. Finally, overexpression of HEY1 reversed the effects of miR-769 on cell proliferation and invasion in CRC.
CONCLUSIONS: Our findings demonstrated that miR-769 suppressed the proliferation and invasion of CRC cells through targeting HEY1, which implied that miR-769 might be a novel therapeutic target for CRC treatment.

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