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Human peripheral B cells: a different cytometric point of view
Maurizio Carbonari1, Tiziana Tedesco, Massimo Fiorilli
1Department of Clinical Medicine, University of Rome La Sapienza, Viale dell'Università 37, 00185 Rome, Italy. maurizio.carbonari@uniroma1.it
Insights
This study introduces apparent fluorescence density analysis for human B lymphocytes, correlating fluorescence intensity with cell size. This method reveals unique surface molecule expression patterns in B cell disorders, improving flow cytometry analysis.
Area of Science:
- Immunology
- Cell Biology
- Biotechnology
Background:
- Human peripheral B lymphocytes exhibit complex flow cytometry signals.
- Current methods often report fluorescence intensity without considering cell surface area.
- A novel approach using fluorescence intensity to forward scatter ratio is proposed.
Purpose of the Study:
- To introduce a new method for analyzing B lymphocyte surface molecules.
- To determine the apparent fluorescence density of surface molecules.
- To improve the interpretation of flow cytometry data.
Main Methods:
- Analysis of list mode data from live B cells.
- Logical gating of B cell populations.
- Serial scanning of FSC vs. SSC plots to calculate apparent fluorescence density.
Main Results:
- Detected steady and modulated fluorescence densities for various surface molecules on normal B lymphocytes.
- Observed distinct alterations in phenotype density values and distributions in B cells from patients with disorders.
- Demonstrated the ability to differentiate size-dependent fluorescence variations.
Conclusions:
- Apparent fluorescence density analysis in human B cell cytometry accounts for cell size variations.
- This method uncovers expression patterns not detectable by conventional intensity-based approaches.
- Preliminary data suggest clinical utility in diagnosing B cell disorders.
Background:
Human peripheral B lymphocytes, analyzed by current flow cytometers, frequently show complex patterns of morphological and fluorescence signals. However, fluorescence intensity values are commonly reported without any correlation to the cell surface area. We propose a different approach, based on the evaluation of the ratio of phenotype fluorescence intensity to forward scatter intensity, to determine the apparent fluorescence density of surface molecules.
Methods:
Starting from list mode acquired data, and after logical gating of live B cells, the analytical procedure suggests a serial scanning of the FSC versus SSC plot to obtain apparent fluorescence density of progressively larger cells.
Results:
This method, applied to normal human peripheral B lymphocytes, was able to detect the presence of steady and modulated (with respect to cell size) fluorescence densities for a variety of surface molecules. B cells from patients with B cell disorders displayed interesting alterations of the phenotype density values and distributions.
Conclusions:
Our preliminary data show that, in human B cell cytometry, the apparent fluorescence density based method allows one to recognize variations in fluorescence intensities solely due to cell size differences and to disclose patterns of expression not detectable by the conventional intensity based approach.
