A simultaneous three-color T cell subsets analysis with single laser flow cytometers using T cell gating protocol....

Area of Science:

• Immunology
• Flow Cytometry
• Cellular Analysis

Background:

• Accurate enumeration of T lymphocyte subsets (CD4 and CD8) is critical for monitoring immune status, particularly in diseases like AIDS.
• Existing methods may lack efficiency or simplicity for routine monitoring.
• Simultaneous analysis of CD3, CD4, and CD8 positive cells is desirable for comprehensive T cell assessment.

Purpose of the Study:

• To develop and present a novel method for the simultaneous analysis of CD3, CD4, and CD8 positive cells.
• To enable direct reporting of T helper/inducer (CD4) and T cytotoxic/suppressor (CD8) cells as a percentage of T lymphocytes.
• To provide a practical, reproducible, and fast method for T cell enumeration.

Main Methods:

• Utilizing single-laser flow cytometry for whole blood analysis.
• Implementing a "T gating" strategy, where CD4 and CD8 positive cells are identified only if they are CD3 positive.
• Employing peridinin chlorophyll protein (PerCP)-conjugated anti-CD3 monoclonal antibodies (MAbs) as a key fluorochrome.

Main Results:

• Successful simultaneous quantification of CD3, CD4, and CD8 positive cells from a single test tube.
• Obtained values for T helper/inducer and T cytotoxic/suppressor cells are directly reportable as a percentage of T lymphocytes.
• The method allows for unambiguous enumeration through a simple, reproducible, and fast procedure.

Conclusions:

• The described T gating method provides a practical approach for simultaneous T cell subset analysis.
• This technique is suitable for monitoring disease progression, especially in conditions like AIDS requiring longitudinal cell enumeration.
• The method's simplicity, reproducibility, and speed enhance its utility in clinical and research settings.