期刊
ONCOLOGY REPORTS
卷 32, 期 6, 页码 2726-2734出版社
SPANDIDOS PUBL LTD
DOI: 10.3892/or.2014.3508
关键词
autophagy; LC3; pancreatic cancer; prognosis; ubiquitin-specific protease 22
类别
资金
- National Natural Science Foundation of China [30870719]
- Dalian Municipal Science and Technology Foundation [2011E15SF114]
Ubiquitin-specific protease 22 (USP22) is a component of the transcription regulatory histone acetylation complex SAGA, which broadly regulates gene transcription and correlates with cancer progression, metastasis and prognosis. Autophagy is a cell pathway with dual functions that promotes cell survival or death. However, it is not known whether USP22 can regulate autophagy in pancreatic cancer. In the present study, we first identified that USP22 was overexpressed in a large number of pancreatic cancer patient samples, concomitant with the increased expression of LC3, a marker of autophagy. Statistical analysis revealed that the increase in USP22 and autophagy was positively correlated with poor prognosis of pancreatic cancer patients. Further investigation using a human pancreatic cancer cell (Panc-1) identified that the overexpression of USP22 increased the processing of LC3 into the active form LC3-II and the number of autophagosomes, thus leading to enhanced autophagy. Activation of ERK1/2 kinase rather than AKT1 by USP22 was found to be one of the mechanisms promoting LC3 processing. USP22-induced autophagy was also found to enhance cell proliferation and resistance to starvation and chemotherapeutic drugs in Panc-1 cells, therefore expressing an overall effect that promotes cell survival. Collectively, the present study demonstrated a new function of USP22 that induces autophagy, thus leading to the poor prognosis of pancreatic cancer.
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