Flow-cytofluorometric determination of active and total rosettes

Area of Science:

• Immunology
• Cell Biology
• Biotechnology

Background:

• Determining lymphocyte rosette formation is crucial for immunological assessments.
• Microscopic methods for counting active and total rosettes have limitations in reproducibility and objectivity.
• Sheep red blood cells (SRBCs) are commonly used to study lymphocyte interactions.

Purpose of the Study:

• To introduce and validate a flow-cytofluorometric technique for quantifying active and total lymphocyte rosettes.
• To compare the flow cytometry method with traditional microscopy for rosette determination.
• To assess rosette formation in cancer patients compared to normal donors.

Main Methods:

• A flow-cytofluorometric assay was developed to measure active and total rosettes formed by human peripheral blood lymphocytes and SRBCs.
• Active rosettes were defined as lymphocytes with ≥3 SRBCs, and total rosettes as lymphocytes with ≥4 SRBCs.
• Results were correlated with microscopic determinations.

Main Results:

• The flow cytometry technique showed good correlation with microscopic methods for both active and total rosettes.
• Cancer patients exhibited a decreased capacity to form active rosettes, influenced by the specific SRBCs used.
• Total rosette levels in cancer patients were not significantly different from normal donors and were unaffected by individual SRBC variations.
• Flow cytometry provided a rapid, reproducible, and objective measurement of rosette levels.

Conclusions:

• Flow cytometry is a more effective and reliable method than microscopy for measuring active and total lymphocyte rosettes.
• The observed decrease in active rosette formation in cancer patients warrants further investigation into its specific mechanisms and implications.
• This technique enhances the ability to differentiate immune status in normal individuals and cancer patients.