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Down-regulated expression of ATG5 in colorectal cancer

Dong-Hyung Cho1, Yoon Kyung Jo, Seung Cheol Kim

  • 1Graduate School of East-West Medical Science, Kyung Hee University, Gyeonggi-do, Republic of Korea. dhcho@khu.ac.kr

Anticancer Research
|September 21, 2012
PubMed

Insights

Autophagy-related gene 5 (ATG5) is down-regulated in most colorectal cancers. However, increased ATG5 expression correlates with lymphovascular invasion, suggesting its potential as a biomarker for colorectal cancer prognosis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cellular Biology

Background:

  • Autophagy's role in tumor development is paradoxical, acting as both a tumor suppressor and a facilitator under stress.
  • Autophagy is regulated by autophagy-related gene (ATG) proteins, with 16 identified in mammals.

Purpose of the Study:

  • To investigate the clinicopathological role of ATG5 in sporadic colorectal cancer.
  • To determine if ATG5 expression can serve as a prognostic or diagnostic biomarker.

Main Methods:

  • Expression analysis of ATG5 in colorectal cancer tissues.
  • Immunohistochemical analysis of ATG5 in relation to clinicopathological features.

Main Results:

  • ATG5 was significantly down-regulated in 38 out of 40 colorectal cancer patients.
  • Increased ATG5 expression was associated with lymphovascular invasion (p=0.035).

Conclusions:

  • ATG5 exhibits down-regulation in colorectal cancer.
  • ATG5 may serve as a potential prognostic or diagnostic biomarker for colorectal cancer, particularly concerning lymphovascular invasion.

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