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Updated: Aug 13, 2026
Quantitative Mass Spectrometric Profiling of Cancer-cell Proteomes Derived From Liquid and Solid Tumors
Published on: February 27, 2015
Differential phosphoprotein mapping in cancer cells using protein microarrays produced from 2-D liquid fractionation
Manoj Pal1, Allison Moffa, Arun Sreekumar
1Department of Chemistry, University of Michigan, Ann Arbor, 48109, USA.
Abstract:
A combination of protein microarrays and two-dimensional liquid-phase separation of proteins has been used for global profiling of the phosphoproteome in human breast cancer cells. This method has been applied to study changes in phosphorylation profile resulting from treatment of the cancer cells with PD173074, a known receptor tyrosine kinase inhibitor. The proteins separated by 2-D liquid-phase separation were arrayed on epoxy-coated glass slides and first screened for phosphorylation using fluorescent Pro-Q Diamond stain. The candidate proteins were then identified using MALDI/ESI MS/MS analysis. Further, validation was achieved by immunoblot analysis using anti-phosphotyrosine antibodies. A dynamic range of approximately 100 was achieved on the microarray when beta-casein was used as a standard protein for obtaining quantitative data. Importantly, the power of this method lies in its ability to identify a large group of proteins in a single experiment that are coregulated in their posttranslational modifications, upon treatment with the inhibitor. Since proteins are known to form interacting circuits that eventually lead to various signaling events, detection of such global phosphorylation profiles might enable delineation of functional pathways that play an important role during cancer initiation and progression.
Insights
This study introduces a novel method for profiling the phosphoproteome in breast cancer cells. It identifies proteins with altered phosphorylation after treatment with a receptor tyrosine kinase inhibitor, aiding in understanding cancer signaling pathways.
Area of Science:
- Proteomics
- Cancer Biology
- Molecular Signaling
Background:
- Phosphorylation is a key post-translational modification regulating cellular signaling pathways.
- Aberrant phosphorylation is implicated in cancer initiation and progression.
- Global phosphoproteome profiling is essential for understanding complex cancer biology.
Purpose of the Study:
- To develop and apply a novel method for global phosphoproteome profiling in human breast cancer cells.
- To investigate changes in protein phosphorylation patterns upon treatment with a receptor tyrosine kinase inhibitor (PD173074).
- To identify coregulated proteins and potential signaling pathways involved in cancer progression.
Main Methods:
- Utilized a combination of protein microarrays and two-dimensional (2-D) liquid-phase separation for protein separation.
- Screened for phosphorylation using fluorescent Pro-Q Diamond stain on arrayed proteins.
- Identified candidate proteins via MALDI/ESI MS/MS analysis and validated using immunoblot analysis with anti-phosphotyrosine antibodies.
- Achieved a dynamic range of approximately 100 using beta-casein as a standard for quantitative data.
Main Results:
- Successfully profiled the phosphoproteome in human breast cancer cells.
- Identified significant changes in phosphorylation profiles following PD173074 treatment.
- Demonstrated the method's capability to identify large groups of coregulated proteins in a single experiment.
- Established a dynamic range for quantitative analysis on the microarray.
Conclusions:
- The developed method enables global phosphoproteome profiling and identification of coregulated proteins.
- This approach facilitates the delineation of functional pathways critical for cancer initiation and progression.
- Understanding global phosphorylation changes provides insights into receptor tyrosine kinase inhibitor mechanisms and cancer signaling circuits.
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