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T-lymphocyte subsets in patients with idiopathic dilated cardiomyopathy
K C Huber1, B J Gersh, D D Sugrue
1Department of Medical Statistics and Epidemiology, Mayo Clinic, Rochester, MN 55905.
Insights
Heart failure patients show reduced T-suppressor cells, particularly those with shorter symptom duration. This decrease may be linked to the duration of heart failure, not necessarily its cause.
Area of Science:
- Immunology
- Cardiology
- Clinical Medicine
Background:
- T-cell subsets play a crucial role in immune regulation.
- Alterations in T-cell populations have been observed in various disease states, including heart failure.
- Idiopathic dilated cardiomyopathy (IDCM) is a significant cause of heart failure, but its underlying immune mechanisms are not fully understood.
Purpose of the Study:
- To investigate T-cell subset distribution in patients with heart failure.
- To compare T-cell profiles between heart failure due to IDCM and other causes.
- To explore the relationship between T-cell subset frequencies and the duration of heart failure symptoms.
Main Methods:
- Peripheral blood samples were collected from patients with heart failure (IDCM and other causes) and healthy controls.
- Flow cytometry was used to quantify T-cell subsets, focusing on T-suppressor cells.
- Statistical analyses, including multivariate analysis, were performed to identify predictors of T-cell frequencies.
Main Results:
- Patients with heart failure exhibited significantly lower percentages of T-suppressor cells compared to normal controls.
- The reduction in T-suppressor cells was more pronounced in patients with a shorter duration of heart failure symptoms (<1 year).
- Multivariate analysis identified symptom duration and age as independent predictors of T-suppressor cell frequencies.
Conclusions:
- Decreased T-suppressor cell percentage in heart failure patients, especially those with IDCM, appears to be associated with the duration of the illness.
- The observed T-suppressor cell reduction may be an epiphenomenon related to symptom duration rather than a primary etiological factor in IDCM.
- These findings necessitate careful consideration of symptom duration when investigating the role of T-suppressor cells in the pathogenesis of heart failure.
Abstract:
T-cell subsets were measured in the peripheral blood of 33 patients with heart failure from idiopathic dilated cardiomyopathy, 22 patients with heart failure from other causes, and 33 normal controls. Mean T-suppressor cell percentage was 30% in normals, 21% in patients with idiopathic dilated cardiomyopathy whose duration of symptoms was less than 1 year (P = 0.0005), and 26% in those with symptoms for greater than 1 year (P = 0.05). Similarly, percentage of T-suppressor cells in the group with heart failure from causes other than idiopathic dilated cardiomyopathy was significantly lower (23%; P = 0.005) in those with short duration of symptoms. When both heart failure groups were combined those with symptoms for less than 1 year had significantly lower T-suppressor frequencies (22%) than those with symptoms for more than 1 year (P = 0.015). Multivariate analysis identified duration of symptoms and age as the only independent predictors of T-suppressor cell frequencies. Decreased percentage of T-suppressor cells in patients with idiopathic dilated cardiomyopathy may be an epiphenomenon related to duration of heart failure. This should be taken into account in assigning an etiologic mechanism for T-suppressor cells in idiopathic dilated cardiomyopathy.