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

Chao Han1, Yingming Song1, Changhong Lian1

  • 1Department of General Surgery, Peace Hospital Affiliated to Changzhi Medical College, Changzhi, Shanxi, China (mainland).

Medical Science Monitor : International Medical Journal of Experimental and Clinical Research
|December 20, 2018
PubMed

Insights

MicroRNA-769 (miR-769) acts as a tumor suppressor in colorectal cancer (CRC). Lower miR-769 levels correlate with poor prognosis, and its restoration inhibits CRC cell proliferation and invasion by targeting HEY1.

Area of Science:

  • Molecular Biology
  • Oncology
  • Genetics

Background:

  • MicroRNAs (miRNAs) are key regulators in human cancers, including colorectal cancer (CRC).
  • The specific role of miR-769 in CRC progression was previously unclear.
  • This study investigated the function of miR-769 in colorectal cancer.

Purpose of the Study:

  • To determine the expression levels of miR-769 in CRC tissues.
  • To analyze the correlation between miR-769 expression and patient prognosis.
  • To elucidate the functional role and molecular mechanism of miR-769 in CRC.

Main Methods:

  • Quantitative real-time polymerase chain reaction (qRT-PCR) and in situ hybridization for miR-769 expression.
  • Kaplan-Meier analysis for prognosis.
  • Cell Counting Kit-8 (CCK8), fluorescence activated cell sorting (FACS), and Transwell assays for cell proliferation, cell cycle, and invasion.
  • Western blot to assess HEY1 expression.

Main Results:

  • miR-769 expression was significantly decreased in CRC tissues compared to normal tissues.
  • Lower miR-769 levels were negatively correlated with poorer patient prognosis.
  • Overexpression of miR-769 inhibited CRC cell proliferation and invasion, and induced G0 cell cycle arrest.
  • HEY1 was identified as a direct target of miR-769, with inverse expression correlation in CRC tissues.
  • HEY1 overexpression counteracted the inhibitory effects of miR-769 on CRC cell proliferation and invasion.

Conclusions:

  • miR-769 functions as a tumor suppressor in colorectal cancer.
  • It inhibits CRC cell proliferation and invasion by directly targeting HEY1.
  • miR-769 represents a potential novel therapeutic target for colorectal cancer treatment.

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