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Mass Cytometry: Protocol for Daily Tuning and Running Cell Samples on a CyTOF Mass Cytometer
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Published on: November 2, 2012

Development of mass cytometry methods for bacterial discrimination.

Michael D Leipold1, Olga Ornatsky, Vladimir Baranov

  • 1Department of Chemistry, University of Toronto, Toronto, Ontario, Canada M5S 3H6.

Analytical Biochemistry
|August 30, 2011
PubMed
Summary

Mass cytometry enables single-cell analysis of bacterial surface polysaccharides for Escherichia coli. This technique revealed rapid lipopolysaccharide export, significantly faster than bacterial doubling time.

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Area of Science:

  • Microbiology
  • Analytical Chemistry
  • Biotechnology

Background:

  • Fluorescent flow cytometry faces limitations in bacterial analysis, including dynamic range, spectral overlap, and low signal intensity.
  • Mass cytometry offers high-resolution, multiparametric single-cell analysis, overcoming limitations of traditional methods.
  • Bacterial cell surface polysaccharides play crucial roles in cell structure and interaction.

Purpose of the Study:

  • To demonstrate the utility of mass cytometry for differentiating individual bacterial cells based on surface polysaccharides.
  • To investigate the export dynamics of O-antigen substituted lipopolysaccharide in Escherichia coli.

Main Methods:

  • Utilized mass cytometry with metal-based membrane stains and lanthanide-conjugated lectins (concanavalin A and wheat germ agglutinin).
  • Analyzed three distinct surface polysaccharides on individual Escherichia coli cells.
  • Tracked lipopolysaccharide export in a conditional mutant using mass cytometry.

Main Results:

  • Successfully differentiated individual Escherichia coli cells based on their unique surface polysaccharide profiles.
  • Quantified lipopolysaccharide export, finding it approximately 10 times faster than the bacterial logarithmic doubling time.
  • Demonstrated that the bacterial culture responded uniformly during the export process.

Conclusions:

  • Mass cytometry is a powerful tool for high-resolution, single-cell analysis of bacterial surface structures.
  • Lipopolysaccharide export is a rapid process in Escherichia coli, occurring significantly faster than cell division.
  • This technique provides new insights into bacterial physiology and outer membrane biogenesis.