Gel-assisted mass spectrometry imaging enables sub-micrometer spatial lipidomics

Area of Science:

• Biochemistry
• Analytical Chemistry
• Cell Biology

Background:

• Mass spectrometry imaging (MSI) enables label-free spatial analysis of biomolecules in intact specimens.
• Current MSI techniques are limited in spatial resolution, hindering single-cell applications.
• Existing instrumental and physical constraints restrict MSI's ability to resolve cellular-level details.

Purpose of the Study:

• To develop a novel sample preparation and imaging workflow to overcome the spatial resolution limits of mass spectrometry imaging.
• To enhance the accessibility of MSI for cellular-scale spatial analysis.
• To improve the resolution of matrix-assisted laser desorption/ionization MSI (MALDI-MSI) for detailed biomolecular investigation.

Main Methods:

• Development of Gel-Assisted Mass Spectrometry Imaging (GAMSI) workflow.
• Utilizing the reversible interaction between analytes and a superabsorbent hydrogel for sample preparation.
• Applying GAMSI to enhance the spatial resolution of MALDI-MSI without hardware modification.

Main Results:

• Achieved ~3-6-fold enhancement in spatial resolution for MALDI-MSI.
• Demonstrated sub-micrometer spatial resolution capabilities with GAMSI.
• Successfully applied the method to intact specimens for cellular-scale analysis.

Conclusions:

• GAMSI significantly improves MSI spatial resolution, enabling cellular-level investigations.
• The technique is compatible with existing mass spectrometry hardware and analysis pipelines.
• GAMSI broadens the application of MSI for detailed spatial biomolecular studies at the cellular scale.