Three-dimensional visualization of protein expression in mouse brain structures using imaging mass spectrometry.

Area of Science:

• Neuroscience
• Mass Spectrometry Imaging
• Biomedical Engineering

Background:

• Matrix-assisted laser desorption ionization imaging mass spectrometry (MALDI IMS) provides spatially resolved molecular information.
• Visualizing MALDI IMS data in three dimensions (3-D) alongside anatomical structures is challenging.
• Understanding brain function requires correlating molecular data with detailed tissue architecture.

Purpose of the Study:

• To develop and demonstrate a novel method for 3-D visualization of MALDI IMS data integrated with optical tissue imaging.
• To enable the correlation of proteomic data with specific anatomical regions in the brain.
• To provide a framework for analyzing complex biological samples in three dimensions.

Main Methods:

• Optical images from serial coronal brain sections were aligned to reconstruct tissue surfaces.
• Segmentation of aligned optical images defined anatomical contours, specifically the corpus callosum.
• MALDI IMS data were coregistered to optical images and superimposed onto the reconstructed surface for 3-D visualization.

Main Results:

• A robust methodology for 3-D reconstruction and visualization of MALDI IMS data was successfully developed.
• The method was exemplified by visualizing myelin basic protein (MBP) distribution in the mouse corpus callosum.
• The 3-D visualization successfully integrated proteomic data with detailed anatomical features.

Conclusions:

• The developed method allows for comprehensive 3-D visualization of MALDI IMS data aligned with tissue structures.
• This approach enhances the understanding of brain function and pathology by correlating molecular and anatomical information.
• The technique shows potential for application in more intricate anatomical studies and disease research.