Quantitative determination of CD4/CD8 molecules by a cell marker ELISA

Area of Science:

• Immunology
• Biotechnology
• Clinical Diagnostics

Background:

• Quantifying CD4+ and CD8+ T cells is crucial for managing human immunodeficiency virus (HIV) infection.
• Flow cytometry is the standard method for T cell enumeration but can be time-consuming and require larger sample volumes.

Purpose of the Study:

• To compare the efficacy of a novel cell marker ELISA with traditional flow cytometry for quantifying CD4 and CD8 molecules on T lymphocytes.
• To correlate ELISA and flow cytometry results with T cell counts and clinical data in HIV patients.

Main Methods:

• A cell marker ELISA was developed and validated against flow cytometry for CD4 and CD8 molecule quantitation.
• 343 patient samples were analyzed using both methods.
• Correlation analyses were performed between ELISA and flow cytometry results, and with clinical data.

Main Results:

• ELISA results showed strong correlation with flow cytometry for both CD4 (r=0.69) and CD8 (r=0.81) quantitation.
• The ELISA detected changes in CD8 molecules earlier than flow cytometry detected changes in CD8+ T cell counts.
• ELISA requires a small blood volume (0.5 mL) and offers internal standardization.

Conclusions:

• Cell marker ELISA is an efficient and reliable alternative to flow cytometry for quantifying CD4 and CD8 T cells in HIV patients.
• The ELISA's advantages include speed, minimal sample volume, and early detection of CD8+ T cell count changes.
• This method simplifies monitoring immune status in HIV management.