Relation between CD4+ T-cell activation and severity of chronic heart failure secondary to ischemic or idiopathic...

Area of Science:

• Immunology
• Cardiology
• Biochemistry

Background:

• CD4(+) T cells play a role in heart disease, with their blood percentage linked to left ventricular dysfunction.
• Understanding T-cell activation in heart failure (HF) is crucial for differentiating between cardiac conditions.

Purpose of the Study:

• To investigate the relationship between CD4(+) T cell activation and New York Heart Association (NYHA) functional classes in chronic heart failure.
• To explore differences in inflammatory T-cell activation between ischemic cardiomyopathy (IC) and idiopathic dilated cardiomyopathy (IDC).

Main Methods:

• Analyzed blood samples from 47 HF patients and 20 controls using 3-color flow cytometry.
• Quantified percentages of interferon-gamma (IFN-γ)-positive CD4(+) T cells (type 1) and interleukin-4 (IL-4)-positive CD4(+) T cells (type 2).
• Correlated T-cell activation markers with NYHA functional class and plasma B-type natriuretic peptide (BNP) levels.

Main Results:

• Patients with HF exhibited significantly higher proportions of IFN-γ-positive CD4(+) T cells compared to controls (28.96% vs. 18.12%, p=0.0006).
• No significant difference in IL-4-positive CD4(+) T cells was observed between HF patients and controls.
• IFN-γ-positive CD4(+) T cell proportions and plasma BNP levels increased with NYHA class severity in both IC and IDC groups.
• IC patients showed higher IFN-γ-positive CD4(+) T cell proportions (33.88%) than IDC patients (22.33%, p=0.002).
• Plasma BNP levels were higher in IDC patients (358.0 pg/ml) than in IC patients (82.7 pg/ml, p=0.019).

Conclusions:

• Type 1 T-helper cell activation is pronounced in heart failure patients and escalates with disease severity.
• The specific patterns of T-cell activation differ between IC and IDC, suggesting distinct inflammatory pathways.