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Unlocking the brain: A new method for Western blot protein detection from fixed brain tissue
Jonathan S Thacker1, Delaney Andersen1, Stanley Liang1
1Division of Medical Sciences, University of Victoria, Victoria, British Columbia V8P 5C2, Canada.
Journal of Neuroscience Methods
|November 17, 2020
Summary
Aldehyde fixation preserves tissue structure but hinders protein analysis. New antigen retrieval methods now allow proteomic studies, like Western blots, on aldehyde-fixed brain tissue.
Area of Science:
- Biochemistry
- Neuroscience
- Proteomics
Background:
- Aldehyde fixation is standard for preserving biological sample structure ex vivo.
- This process forms covalent bonds between aldehydes and biomolecular amines.
- Fixed tissues are typically unsuitable for proteomic analyses like Western blot.
Purpose of the Study:
- To develop antigen retrieval methods for aldehyde-fixed brain tissue.
- To enable proteomic analysis of fixed brain samples using Western blot.
Main Methods:
- Developed antigen retrieval steps for fixed-brain lysates.
- Utilized prolonged high-temperature exposure (90°C for 2h).
- Incorporated a formaldehyde scavenger and ionic detergent.
Main Results:
- Successfully solubilized detectable levels of synaptic and non-synaptic proteins.
- Demonstrated suitability of fixed tissue for Western blot analysis.
- Revealed a variety of proteins on membrane blots.
Conclusions:
- The protocol enables proteomic analysis of aldehyde-fixed tissues.
- This method is valuable for neuropathological studies.
- Expands the utility of fixed tissue samples for research.
