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The activated immune system and the renin-angiotensin-aldosterone system in congestive heart failure
M Samsonov1, J Lopatin, G P Tilz
1Cardiology Research Centre, Moscow, Russia.
Insights
This study explored connections between the renin-angiotensin-aldosterone system and immune markers in congestive heart failure patients. Findings suggest a weak relationship between these systems in severe heart failure.
Area of Science:
- Cardiology
- Immunology
- Endocrinology
Background:
- Congestive heart failure (CHF) involves complex interactions.
- The renin-angiotensin-aldosterone system (RAAS) plays a key role in cardiovascular regulation.
- Immune activation is increasingly recognized in CHF pathophysiology.
Purpose of the Study:
- To investigate potential relationships between RAAS components and immune activation markers in CHF patients.
- To assess correlations between specific RAAS hormones and immune mediators.
- To explore these associations across different stages of CHF severity.
Main Methods:
- Study included 53 CHF patients (mean age 46 years), categorized by NYHA class.
- Measured plasma renin activity, angiotensin II, angiotensin-converting enzyme, and aldosterone.
- Assessed serum neopterin, soluble tumor necrosis factor receptor, and interleukin-2 receptor levels.
Main Results:
- All measured analytes showed significant correlations with NYHA classes (P < 0.05).
- Neopterin correlated with angiotensin-converting enzyme and aldosterone (rs = 0.35, rs = 0.36; P < 0.05).
- Soluble tumor necrosis factor receptor concentrations correlated with plasma renin activity (rs = 0.38; P < 0.05).
Conclusions:
- Suggests an association between the RAAS and immune activation in severe CHF.
- The identified relationships between these systems in CHF appear to be relatively weak.
- Further research is needed to elucidate the precise mechanisms and clinical significance.
Objects:
The aim of the study was to investigate a possible relationship between plasma renin activity, angiotensin II, serum levels of angiotensin-converting enzyme, aldosterone and markers of immune activation in congestive heart failure (CHF).
Patients And Methods:
Fifty-three patients (50 male, three female, mean age 46 +/- 16 years) with congestive heart failure were studied. Twenty-eight patients had I or II NYHA class of CHF and 25 patients had III or IV NYHA class (NYHA class, mean +/- SD: 2.3 +/- 0.9). Serum neopterin concentration and hormones were measured by commercial radioimmunoassays. Serum soluble receptors of tumour necrosis factor and interleukin-2 were determined by ELISA.
Results:
All analytes significantly correlated with NYHA classes (P < 0.05). There existed correlations between neopterin and angiotensin-converting enzyme or aldosterone (rs = 0.35 and rs = 0.36, P < 0.05). The soluble tumour necrosis factor receptor concentrations correlated with plasma renin activity (rs = 0.38, P < 0.05).
Conclusion:
The result of our study suggest that there exists some relationship between the renin-angiotensin-aldosterone system and immune activation in severe congestive heart failure, however, the associations found are rather weak.