Exclusion-Based Capture and Enumeration of CD4+ T Cells from Whole Blood for Low-Resource Settings

Area of Science:

• Biomedical Engineering
• Immunology
• Medical Diagnostics

Background:

• CD4(+) T-helper cell count is crucial for monitoring HIV/AIDS progression and guiding treatment.
• Current methods like flow cytometry are expensive and inaccessible in many developing countries.
• There is a need for cost-effective, low-volume blood sample methods for CD4(+) T-cell enumeration.

Purpose of the Study:

• To develop and validate a cost-effective system for accurate CD4(+) T-helper cell counting.
• To provide a viable alternative to flow cytometry for HIV patient monitoring in resource-limited settings.
• To enable improved disease progression and therapy response tracking for HIV patients.

Main Methods:

• Utilized two serially-operated immiscible phase exclusion-based cell isolations.
• Employed Immiscible Filtration Assisted by Surface Tension (IFAST) for T-helper cell isolation.
• Integrated a rapid fluorescent readout for accurate cell counting.

Main Results:

• The IFAST method demonstrated comparable performance to the established Dynal T4 Quant Kit.
• The system is sensitive for CD4 counts indicative of immunocompromised patients (below 200 cells/µL).
• Achieved accurate T-helper cell isolation and counting from smaller blood volumes at lower cost.

Conclusions:

• The developed IFAST system offers a cost-effective and accurate solution for CD4(+) T-cell counting.
• This high-throughput, automatable method can significantly improve HIV patient care in resource-limited areas.
• The open, simple-to-operate devices make the technique suitable for widespread adoption.