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Dynamic changes of the phosphoproteome in postmortem mouse brains
Tsutomu Oka1, Kazuhiko Tagawa, Hikaru Ito
1Department of Neuropathology, Medical Research Institute, Tokyo Medical and Dental University, Tokyo, Japan.
Plos One
|July 7, 2011
Summary
Postmortem changes affect protein phosphorylation in brain tissue, varying with temperature and time. This study identifies critical preservation times and proteins to accurately assess brain samples for neurodegenerative disorder research.
Area of Science:
- Neuroscience
- Biochemistry
- Proteomics
Background:
- Protein phosphorylation is crucial in neurodegenerative disease pathology.
- Postmortem conditions like time and temperature can alter phosphorylation in human brain samples.
- A lack of comprehensive data hinders analysis of phosphorylation in preserved brain tissue.
Purpose of the Study:
- To investigate postmortem changes in protein phosphorylation in mouse brain tissue.
- To establish guidelines for preserving brain samples for phosphoproteomic analysis.
- To identify reliable protein markers for estimating postmortem intervals.
Main Methods:
- Phosphoproteome analysis of mouse brain tissue preserved under varied temperature and time conditions.
- Quantitative whole proteome mass spectrometry.
- Statistical analysis to identify significant changes and correlations.
Main Results:
- Postmortem changes in phosphoproteins are diverse and depend on temperature, time, and protein type.
- Twelve hours postmortem is a critical time point for room temperature preservation.
- Most phosphoproteins remain stable for 72 hours when stored at 4°C.
- Several proteins were identified as potential indicators for calculating postmortem time at room temperature.
Conclusions:
- Understanding postmortem phosphoprotein dynamics is essential for accurate interpretation of brain tissue data.
- Established preservation protocols (e.g., 4°C for 72 hours) can maintain phosphoprotein stability.
- This research provides a foundation for reliable analysis of phosphorylation in human brain samples for neurodegenerative disorder studies.
