Development of the single-cell MALDI-TOF (matrix-assisted laser desorption/ionization time-of-flight)...

Area of Science:

• Cellular Biology
• Analytical Chemistry
• Mass Spectrometry

Background:

• Understanding intracellular molecular dynamics is crucial for cell biology.
• Traditional methods often require cell lysis, losing spatial and temporal information.
• Mast cell maturation involves significant biochemical changes.

Purpose of the Study:

• To develop and apply a novel method for direct intracellular molecule detection in single cells.
• To quantify histamine levels during the maturation of mouse bone marrow-derived mast cells.
• To correlate intracellular molecular content with cellular maturation stage.

Main Methods:

• Utilized matrix-assisted laser desorption/ionization-time of flight (MALDI-TOF) mass spectrometry.
• Employed a microsuction pipette for single-cell isolation and manipulation.
• Analyzed intracellular molecules directly from intact cells cultured on monolayers.

Main Results:

• Successfully detected and measured intracellular histamine in single mouse bone marrow-derived mast cells.
• Observed a gradual increase in intracellular histamine levels during cell maturation.
• Correlated measured histamine concentrations with the estimated maturation stage of individual cells.

Conclusions:

• MALDI-TOF mass spectrometry is a viable technique for analyzing intracellular molecules in single, intact cells.
• This approach allows for the direct monitoring of molecular changes during cellular processes like maturation.
• The method provides a powerful tool for studying cell heterogeneity and dynamic molecular events at the single-cell level.