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[Association of serum C3 and essential hypertension]
C Bozzoli1, A Muscari, G M Puddu
1Istituto di Patologia Speciale Medica e Metodologia Clinica, Università di Bologna, Ospedale S. Orsola.
Insights
This study found elevated levels of the complement component C3 in patients with essential hypertension, suggesting a role for humoral immunity in the condition. This finding was independent of atherosclerosis and linked to higher triglyceride levels.
Area of Science:
- Immunology
- Cardiovascular Medicine
Context:
- Essential hypertension is a complex condition with multifactorial origins.
- The role of humoral immunity in hypertension, independent of atherosclerosis, requires further investigation.
Purpose:
- To investigate the potential involvement of humoral immunity in essential hypertension.
- To assess specific immune markers, including immunoglobulins and complement components (C3, C4), in hypertensive patients without atherosclerosis.
Summary:
- A study compared 23 hypertensive patients and 42 controls, matched for age and sex, and without diagnosed atherosclerosis.
- Hypertensive subjects exhibited significantly higher serum C3 levels compared to controls (p=0.0183).
- Serum C3 levels correlated positively with triglycerides, but logistic regression confirmed C3 as an independent marker associated with hypertension.
Impact:
- The findings suggest that elevated complement component C3 may play a role in the pathogenesis or progression of essential hypertension.
- This research highlights a potential link between the immune system and hypertension, opening avenues for future research and therapeutic targets.
Abstract:
This study was performed to assess the possible involvement of humoral immunity in essential hypertension, independently of the presence of atherosclerotic disease, which in turn may be associated with immunologic changes. Sixty-five patients without demonstrated atherosclerotic disease were selected according to clinical and arteriographic criteria, including 23 hypertensive subjects (all pharmacologically treated) and 42 controls. Mean ages (58.7 +/- 8.3(1 S.D.) years in the controls and 57.7 +/- 7.9 years in the hypertensive subjects) and sex distribution were similar in the 2 groups. Of the main risk factors, atherosclerosis, smoking, diabetes, total cholesterol and HDL-cholesterol were equivalent, while triglycerides were higher in the hypertensive subjects than in the controls (142.6 +/- 52.7 vs. 112.6 +/- 67.7 mg/dl; p = 0.0065). In these subjects' sera the immunoglobulins IgG, IgA and IgM, and the third and fourth complement components (C3 and C4) were measured. Of these variables, only C3 was higher in the hypertensive subjects than in the controls (124.3 +/- 29.3 vs. 107.8 +/- 18.4 mg/dl; p = 0.0183). Furthermore, C3 was significantly correlated with triglycerides (tau = 0.3613; p < 0.0001), but the association with hypertension was confirmed only for C3, and not for triglycerides, by multiple logistic regression (p = 0.0142). The increase in serum C3 suggests the possible implication of humoral immunity in the pathogenesis or progression of essential hypertension.