Distinct CD4^-CD8^- (Double-Negative) Memory T-Cell Subpopulations Are Associated With Indeterminate and Cardiac...

Area of Science:

• Immunology
• Cardiovascular Disease
• Parasitology

Background:

• Chagas heart disease, caused by Trypanosoma cruzi, involves a pathogenic inflammatory response.
• CD4-CD8- (double-negative, DN) T cells are implicated in regulating cytokine networks during inflammation.

Purpose of the Study:

• To investigate the distribution, activation, and cytokine profiles of memory DN T-cell subpopulations in Chagas disease patients.
• To explore the clinical relevance and potential therapeutic targeting of DN T cells in Chagas cardiomyopathy.

Main Methods:

• Analysis of memory DN T-cell subpopulations (central vs. effector memory) in Chagas disease patients (indeterminate and cardiomyopathy forms).
• Assessment of cytokine expression (IFN-γ, IL-10) and correlation with cardiac function indicators.
• Investigation of CD1d-mediated activation effects on effector memory DN T cells.

Main Results:

• Indeterminate form patients showed higher central memory DN T cells with balanced IFN-γ/IL-10 expression.
• Cardiomyopathy patients exhibited increased effector memory DN T cells lacking balanced cytokine profiles.
• Central memory DN T cell frequency correlated with better ventricular function; effector memory did not.
• Reducing CD1d-mediated activation increased IL-10 in effector memory DN T cells, restoring a balanced profile.

Conclusions:

• Memory DN T-cell subsets differ between Chagas disease forms, impacting disease progression.
• Effector memory DN T cells are associated with cardiac dysfunction in Chagas cardiomyopathy.
• Targeting CD1d-mediated activation of effector memory DN T cells could be a therapeutic strategy for Chagas cardiomyopathy and other inflammatory diseases.