A simultaneous method for detection and quantitation of T- and B-lymphocytes

Area of Science:

• Immunology
• Cell Biology
• Hematology

Background:

• Accurate quantitation of lymphocyte populations is crucial for diagnosing and monitoring various immune conditions.
• Existing methods for lymphocyte subset analysis may require larger blood volumes or complex procedures.
• There is a need for a simple, reliable assay to quantify B- and T-lymphocytes from limited blood samples.

Purpose of the Study:

• To develop and validate a novel assay for the simultaneous quantitation of B- and T-lymphocytes.
• To enable lymphocyte subset analysis using small volumes of heparinized human blood.
• To establish normal distribution ranges for T-cells, B-cells, and lymphocytes expressing both receptors.

Main Methods:

• Mononuclear cells were isolated from small volumes of heparinized human blood using Ficoll-Hypaque density gradient centrifugation.
• Simultaneous rosette formation assays were performed: antibody-coated chicken erythrocytes for B-lymphocytes and non-immune sheep erythrocytes for T-lymphocytes.
• The distribution of lymphocyte populations was determined by counting rosettes under a microscope.

Main Results:

• A reproducible assay for quantifying B- and T-lymphocytes was successfully developed.
• Normal distribution values in healthy individuals were determined: T-cells at 60.9% (±7%), B-cells at 16.4% (±4%), and lymphocytes with both receptors at 1.6% (±0.6%).
• The assay demonstrated efficacy in analyzing lymphocyte populations from small blood volumes.

Conclusions:

• The developed assay provides a reliable method for the quantitation of B- and T-lymphocytes.
• This assay is suitable for use with small blood volumes, making it valuable for pediatric or difficult-access patient samples.
• The established normal ranges serve as a reference for future clinical and research applications in immunology.