CD38 expression on cryopreserved CD8+ T cells predicts HIV disease progression

Area of Science:

• Immunology
• Virology
• Clinical Medicine

Background:

• Previous research identified CD38 expression on CD8+ T cells as a significant predictor of disease progression in individuals with human immunodeficiency virus (HIV).
• These prior studies utilized fresh patient samples, necessitating timely analysis.

Purpose of the Study:

• To evaluate the predictive value of CD38 expression on cryopreserved CD8+ T cells for HIV disease progression.
• To confirm the utility of CD38 as a biomarker in a retrospective analysis using frozen samples from patients with CD4 counts > 400 cells/microl.

Main Methods:

• Retrospective analysis of cryopreserved peripheral blood mononuclear cells (PBMCs) from HIV-infected individuals.
• Quantification of CD38 expression on CD8+ T cells using antibody binding capacity and median fluorescence intensity (MFI).
• Correlation of CD38 expression levels with time to new opportunistic infections or death.

Main Results:

• CD38 expression levels, measured by both antibody binding capacity and median channel fluorescence, were significantly associated with clinical outcomes.
• Elevated CD38 expression on CD8+ T cells correlated with a shorter time to new opportunistic infections or death (P < 0.001).
• The predictive value of CD38 expression was validated using cryopreserved samples.

Conclusions:

• CD38 expression on CD8+ T cells is a robust predictor of HIV disease progression, regardless of sample type (fresh or frozen).
• This biomarker can be reliably assessed in cryopreserved samples, facilitating retrospective studies and clinical monitoring.
• CD38 expression provides a valuable prognostic tool for managing HIV-infected patients, even those with relatively preserved CD4 counts.