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Potential role of p62 in tumor development
1Protein Metabolism Project, Tokyo Metropolitan Institute of Medical Science, Setagaya-ku, Tokyo, Japan. komatsu-ms@igakuken.or.jp
Autophagy
|May 28, 2011
Summary
p62 protein aggregates contribute to tumor development in hepatocellular carcinoma (HCC) and other autophagy-deficient tumors by persistently activating the stress response factor Nrf2.
Area of Science:
- Cell Biology
- Molecular Biology
- Oncology
Background:
- p62 is a cellular protein selectively degraded by autophagy.
- Impaired autophagy leads to p62 accumulation and the formation of aggregates with ubiquitinated proteins.
- p62 aggregates are implicated in disease-related inclusion bodies, similar to those in hepatocellular carcinoma (HCC).
Purpose of the Study:
- To investigate the role of p62-positive aggregates in tumor development.
- To elucidate the pathophysiological significance of these aggregates in HCC and autophagy-deficient tumors.
Main Methods:
- Utilized liver-specific Atg7-deficient mice to observe p62 aggregate formation.
- Examined the effect of p62 loss on aggregate dispersion.
- Investigated the link between p62 aggregates and Nrf2 activation in human HCC and tumors with deficient autophagy.
Main Results:
- p62 aggregates are involved in the formation of disease-related inclusion bodies.
- Loss of p62 disperses these aggregates, confirming p62's role in their formation.
- p62-positive aggregates promote tumor development by persistently activating Nrf2.
Conclusions:
- p62-positive aggregates play a significant role in the development of HCC and other autophagy-deficient tumors.
- Persistent Nrf2 activation by p62 aggregates is a key mechanism driving tumor growth.
- Targeting p62 aggregation or Nrf2 activation may offer therapeutic strategies for these cancers.
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