Sample Preparation for Single Cell Mass Spectrometry Metabolomics Studies: Combined Cell Washing, Quenching, Drying,...

Area of Science:

• Metabolomics
• Cellular Biology
• Analytical Chemistry

Background:

• Single-cell mass spectrometry (SCMS) is crucial for understanding cellular metabolism and heterogeneity.
• Preserving endogenous metabolite profiles during sample handling is a significant challenge in SCMS.
• Metabolites are sensitive indicators of cell status but prone to degradation.

Purpose of the Study:

• To develop a robust protocol for preserving cellular metabolite integrity for SCMS analysis.
• To address the limitations of metabolite degradation during sample preparation and transport.
• To enable more accurate molecular insights into live cells using SCMS.

Main Methods:

• A novel protocol involving cell washing with volatile ammonium formate (AF).
• Rapid quenching of cells using liquid nitrogen (LN2).
• Vacuum freeze-drying and storage at -80 °C.

Main Results:

• The protocol effectively halts metabolic activity while minimizing cell membrane damage.
• Rapid quenching is identified as a critical step for metabolite preservation.
• Limited storage time at -80 °C is recommended to maintain metabolite integrity.

Conclusions:

• The developed protocol enhances the reliability of SCMS by preserving cellular metabolite profiles.
• This method offers a reproducible approach for SCMS sample preparation.
• The protocol has potential for broad application across various SCMS techniques.