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Proteome analysis of camptothecin-treated cortical neurons using isotope-coded affinity tags
Li-Rong Yu1, Mark D Johnson, Thomas P Conrads
1Pacific Northwest National Laboratory, Richland, WA, USA.
Electrophoresis
|August 16, 2002
Summary
Isotope-coded affinity tags (ICATs) revealed over 125 protein expression changes in mouse neurons treated with camptothecin. Glycolysis and TCA cycle enzymes were significantly altered, offering insights into neuronal response.
Area of Science:
- Proteomics
- Neuroscience
- Biochemistry
Background:
- Camptothecin is a chemotherapeutic agent that induces DNA damage.
- Understanding its effects on neuronal protein expression is crucial for assessing neurotoxicity and therapeutic potential.
- Mouse cortical neurons serve as a model system for studying drug effects in the central nervous system.
Purpose of the Study:
- To identify and quantify changes in protein expression in mouse cortical neurons upon camptothecin treatment.
- To utilize advanced mass spectrometry techniques for comprehensive proteomic analysis.
- To investigate the functional classes of proteins affected by camptothecin exposure.
Main Methods:
- Isotope-coded affinity tags (ICATs) were used for differential protein labeling (light for control, heavy for camptothecin-treated).
- Proteolytic digestion and peptide isolation via immobilized avidin chromatography.
- Analysis by reversed-phase liquid chromatography coupled to ion-trap mass spectrometry (IT-MS) for identification and Fourier transform ion cyclotron resonance mass spectrometry (FTICR) for quantification.
Main Results:
- Successfully identified and quantified over 125 proteins with altered expression levels.
- IT-MS facilitated peptide identification, while high-resolution FTICR enabled accurate relative quantification.
- A significant proportion of identified proteins were enzymes involved in glycolysis and the tricarboxylic acid cycle.
Conclusions:
- This study demonstrates the power of combining ICAT labeling with dual mass spectrometry approaches for quantitative proteomics in neuronal cells.
- Camptothecin treatment significantly impacts metabolic pathways, particularly glycolysis and the TCA cycle, in mouse cortical neurons.
- The findings provide a foundation for further research into the mechanisms of camptothecin-induced neurotoxicity and potential therapeutic interventions.