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Proteome-Wide Protein Expression Profiling Across Five Pancreatic Cell Lines.
Joao A Paulo1, Joseph D Mancias, Steven P Gygi
1From the *Department of Cell Biology, Harvard Medical School; and †Division of Genomic Stability and DNA Repair, Department of Radiation Oncology, Dana-Farber Cancer Institute, Boston, MA.
Pancreas
|April 5, 2017
Summary
This study quantified thousands of proteins across five pancreatic cell lines using mass spectrometry. Protease choice impacts protein identification depth, with Lys-C/trypsin offering superior results for pancreatic cancer research.
Area of Science:
- Proteomics
- Cancer Biology
- Mass Spectrometry
Background:
- Mass spectrometry-based proteomics is crucial for comprehensive protein expression profiling.
- Understanding protein expression differences across pancreatic cell lines is vital for cancer research.
Purpose of the Study:
- To quantitatively compare relative protein expression levels across five common pancreatic cell lines.
- To evaluate the impact of different protease digestion methods on proteomic dataset depth.
Main Methods:
- Global proteomes of CAPAN-1, HPAC, HPNE, PANC1, and PaSCs were profiled using tandem mass tags (TMT10-plex) in duplicate.
- The study compared protein and peptide identification using Lys-C versus Lys-C/trypsin digestion.
Main Results:
- Over 8000 proteins were quantified across the five cell lines.
- More than 1400 statistically significant differences in protein expression were identified.
- The Lys-C/trypsin method identified 10% more proteins and 30% more peptides compared to Lys-C alone, with high correlation (>0.85).
Conclusions:
- Significant protein expression differences exist across pancreatic cell lines.
- Lys-C/trypsin digestion enhances proteomic discovery compared to Lys-C alone.
- These datasets serve as a resource for targeted analyses of pancreatic cancer cell lines.