New Research Identifies Critical CD39 Expression Patterns on T-Cells Regulating Systemic Inflammation in HIV/HCV Coinfected Patients

New study shows CD4+ T-cells regulate inflammation in HIV/HCV patients by converting pro-inflammatory purines via CD39 expression.

By: AXL Media

Published: Mar 28, 2026, 11:15 AM EDT

Source: Information for this report was sourced from Xia & He Publishing Inc.

The Mechanics of Purinergic Signaling Control

Systemic inflammation remains a primary driver of non-AIDS morbidity and mortality in patients living with HIV and Hepatitis C (HCV) coinfections. Central to the body's attempt to regulate this inflammation is the CD39 ectoenzyme found on T-cells. This enzyme performs a critical biochemical conversion, transforming pro-inflammatory purines into adenosine, a potent immunosuppressive molecule. New research led by Evgeniya Saidakova and colleagues has identified that CD4+ T-cells are the dominant regulators of these purinergic signals. In both healthy individuals and coinfected patients, the proportion of CD4+ T-cells involved in this process far exceeds that of CD8+ T-cells, marking them as the frontline defense against runaway inflammatory responses.

Quantifying the Immune Response Under Therapy

The study utilized flow cytometry to quantify CD39 expression across 41 coinfected patients on stable antiretroviral therapy (ART) and 23 healthy controls. The results showed a stark contrast in cellular engagement: while only 16.1% of CD4+ T-cells in healthy subjects expressed CD39, that number jumped to 24.0% in HIV/HCV coinfected patients. Conversely, CD8+ T-cells showed negligible activity in both groups, with expression rates hovering around 3%. These findings suggest that even when ART successfully manages viral loads, the immune system of coinfected individuals remains in a state of heightened compensatory regulation, attempting to damp down persistent inflammatory signals through increased enzymatic activity.

Subsets and Targeted Migration Patterns

Further analysis revealed that the CD45RA+ subset of CD4+ T-cells carries the highest density of CD39 expression. In coinfected patients, nearly 40% of these specific cells were CD39-positive, compared to roughly 25% in the control group. These cells do not remain stationary, according to the researchers, they circulate between lymphoid organs and actively migrate toward inflamed tissues. This migration is triggered by elevated concentrations of pro-inflammatory cytokines and chemokines, indicating a dynamic and responsive immune architecture. The study demonstrates that the body specifically deploys these "regulator" cells to sites where the risk of tissue damage from inflammation is highest.