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Updated: Sep 26, 2025

A Streamlined Approach for Mass Spectrometry-Based Proteomics Using Selected Tissue Regions
Published on: April 18, 2025
Proteoform-Selective Imaging of Tissues Using Mass Spectrometry
Manxi Yang1, Hang Hu1, Pei Su1,2
1Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, USA.
Nanospray desorption electrospray ionization mass spectrometry imaging (nano-DESI MSI) enables proteoform-specific tissue analysis. This new method reveals distinct protein variant patterns across different brain regions in rats.
Area of Science:
- Biochemistry
- Analytical Chemistry
- Neuroscience
Background:
- Understanding complex biological systems requires advanced proteomic analysis techniques.
- Spatially resolved proteoform-specific analysis is crucial for detailed biological insights.
Purpose of the Study:
- To introduce and validate nanospray desorption electrospray ionization mass spectrometry imaging (nano-DESI MSI) for proteoform-selective tissue imaging.
- To demonstrate the capability of nano-DESI MSI for on-tissue top-down proteomics.
Main Methods:
- Utilized nano-DESI MSI for direct tissue analysis.
- Employed tandem mass spectrometry (MS/MS) for structural characterization of protein ions.
- Applied on-tissue top-down proteomics for proteoform identification.
Main Results:
- Nano-DESI MSI successfully generated multiply charged protein ions suitable for structural analysis.
- Proof-of-concept experiments confirmed the suitability of nano-DESI MSI for proteoform-selective imaging.
- Demonstrated differential proteoform expression in distinct regions of rat brain tissue.
Conclusions:
- Nano-DESI MSI is a powerful tool for spatially resolved, proteoform-specific proteomic analysis.
- This technique advances the study of tissue heterogeneity and regional differences in protein expression.
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