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Inhibition of ATG12-mediated autophagy by miR-214 enhances radiosensitivity in colorectal cancer

J L Hu1,2,3, G Y He1,2,4, X L Lan1,2,5

  • 1Department of Pathology, Nanfang Hospital, Southern Medical University, 510515, Guangzhou, Guangdong, People's Republic of China.

Oncogenesis
|February 21, 2018
PubMed

Insights

MicroRNA-214 (miR-214) is decreased in colorectal cancer (CRC) after radiation. Restoring miR-214 enhances radiosensitivity by inhibiting autophagy, offering a potential therapeutic target for CRC treatment.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Colorectal cancer (CRC) treatment is often limited by radioresistance.
  • MicroRNAs (miRNAs) play a role in cellular response to radiation therapy.
  • Understanding radioresistance mechanisms is crucial for improving CRC patient outcomes.

Purpose of the Study:

  • To investigate the role of miR-214 in colorectal cancer radioresistance.
  • To elucidate the molecular mechanisms by which miR-214 affects radiation response in CRC.
  • To identify miR-214 as a potential biomarker and therapeutic target for CRC.

Main Methods:

  • Analysis of miR-214 expression in CRC cell lines and patient samples post-irradiation.
  • Identification of ATG12 as a direct target of miR-214 using dual luciferase assay, qPCR, and Western blot.
  • In vitro and in vivo experiments to assess the effect of miR-214 and ATG12 on radiosensitivity and autophagy.

Main Results:

  • miR-214 levels were decreased in CRC cells and patients after irradiation.
  • Irradiation enhanced autophagy in CRC cells, and ATG12 was identified as a direct target of miR-214.
  • miR-214 overexpression promoted radiosensitivity by inhibiting autophagy, while ATG12 restoration reversed this effect.
  • High miR-214 expression correlated with radiosensitivity and low CEA levels in CRC patients.

Conclusions:

  • miR-214 enhances colorectal cancer radiosensitivity by inhibiting ATG12-mediated autophagy.
  • miR-214 functions as a key regulator of CRC response to irradiation.
  • miR-214 represents a promising therapeutic target for improving colorectal cancer treatment outcomes.

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