These authors have contributed equally to this study.
Gel-based proteomics analysis of the heterogeneity of 20S proteasomes from four human pancreatic cancer cell lines†
Article first published online: 13 JUL 2011
Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PROTEOMICS - Clinical Applications
Volume 5, Issue 9-10, pages 484–492, October 2011
How to Cite
Wang, X., Zhao, Z., Luo, Y., Chen, G. and Li, Z. (2011), Gel-based proteomics analysis of the heterogeneity of 20S proteasomes from four human pancreatic cancer cell lines. Prot. Clin. Appl., 5: 484–492. doi: 10.1002/prca.201000149
Colour Online: See the article online to view Figs. 1–3 in colour.
- Issue published online: 10 OCT 2011
- Article first published online: 13 JUL 2011
- Accepted manuscript online: 16 JUN 2011 09:20AM EST
- Manuscript Accepted: 30 MAY 2011
- Manuscript Revised: 11 MAY 2011
- Manuscript Received: 9 DEC 2010
- National High-Tech R&D Program of China (863 Program). Grant Number: 2006AA02Z154
- National Natural Science Foundation of China. Grant Numbers: 20675088, 21075137
- Ph.D. Programs Foundation of Ministry of Education of China. Grant Number: 20070023023
- Heterogeneity of 20S proteasome;
- Native gel electrophoresis;
- Pancreatic cancer cell line;
- Proteasome purification;
- Two-dimensional gel electrophoresis
Purpose: The 20S proteasome is a multicatalytic protein complex, which plays a major role in intracellular protein degradation. In mammalian cells, it consists of 28 subunits arranged in four stacked rings (α1-7β1-7β1-7α1-7). The aim of this study is to characterize and compare subunit composition and heterogeneity (or subtypes) of the 20S proteasome from four human pancreatic cancer cell lines.
Experimental design: To study subunit compositions and heterogeneity of 20S proteasome from human pancreatic cancer cell lines, in the present study, 20S proteasome from four different pancreatic cancer cell lines (SW1990, a human exocrine adenocarcinoma, derived from spleen metastasis; PANC-1, a human ductal carcinoma in situ; BxPC-3, a human ductal carcinoma in situ; and CFPAC-1, a human ductal adenocarcinoma, derived from liver metastasis) were subjected to a gel-based proteomics analysis, respectively.
Results: It was found that the differences in the subunit compositions and subtypes of the 20S proteasomes among four pancreatic cancer cell lines exist. Gel-based proteomics analysis showed that more than 60 subunits spots were separated and identified by MS. Our study revealed the presence of various isoforms for each of the subunits and different subtypes of the 20S proteasome. The significant differences among four cell lines are the relative abundances of immunoproteasome subunits, β1i and β2i, indicating that different subtypes of immunoproteasome among four cell lines exist.
Conclusions and clinical relevance: The 20S proteasome from four human pancreatic cancer cell lines was characterized. The different expression levels of immunoproteasome subunits, β1i and β2i, indicate that the 20S proteasome may have different subtypes among four cell lines, which may be related to cancer cell property and be useful for the establishment of personalized therapy using proteasome inhibitors in future.