Journal
VASA-EUROPEAN JOURNAL OF VASCULAR MEDICINE
Volume 50, Issue 6, Pages 413-422Publisher
HOGREFE AG-HOGREFE AG SUISSE
DOI: 10.1024/0301-1526/a000971
Keywords
flow mediated dilation; nitric oxide; kallikrein-kinin-system; angiotensin-converting-enzyme inhibitors; angiotensin receptor blockers
Categories
Funding
- Ministry of Science, Research and Culture, Federal State of Brandenburg (Ministeriums fur Wissenschaft, Forschung und Kultur des Landes Brandenburg)
- Federal Ministry of Education and Research (Bundesministerium fur Bildung und Forschung)
- Chinese Scholarship Council (CSC)
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This study evaluated the nitric oxide-dependent endothelial function and gene expression of bradykinin receptors in peripheral blood mononuclear cells from patients with ACEI or ARB treatment. The results showed that ACEI treatment increased total nitrite/nitrate concentration and upregulated BDKRB1 gene expression, while downregulating BDKRB2 mRNA expression. The findings suggest that FMD is a strong determinant of vascular aging and is influenced by ACEI treatment.
Background: Angiotensin-converting-enzyme inhibitors (ACEI) and angiotensin II receptor blockers (ARB) are widely used as a first-line therapy for the treatment of cardiovascular disease. Here, ACEI modulate the bradykinin receptor (BDKRB1 and BDKRB2) system and NO-dependent endothelial function, thus determining cardiovascular health and regenerative arteriogenesis. The current study aims at evaluating nitric oxide-dependent endothelial function, and gene expression of bradykinin receptors in peripheral blood mononuclear cells (PBMC) from patients with ACEI or ARB treatment. Patients and methods: The WalkByLab has been established to screen cardiovascular patients for peripheral artery disease and coronary artery disease. In total 177 patients from WalkByLab with heterogenous disease and risk status were randomly selected, divided according to their medication history into the following groups: 1. ACEI group, 2. ARB group or 3. non-ACE/ARB group. Total plasma nitrite/nitrate (NO) levels were measured, endothelial function was evaluated by assessing flow meditated dilation (FMD). PBMC were isolated from peripheral whole blood, and gene expression (qRT.PCR) of bradykinin receptors and angiotensin converting enzyme were assessed. Results: Plasma total NO concentration it the ACEI group (24.66 +/- 16.28, mu mol/l) was increased as compared to the ARB group (18.57 +/- 11.58, mu mol/l, P=0.0046) and non-ACE/ARB group (16.83 +/- 8.64, mu mol/l, P=0.0127) in patients between 40 to 90 years of age. However, FMD values (%) in the ACEI group (7.07 +/- 2.40, %) were similar as compared to the ARB (6.35 +/- 2.13, %) and non-ACE/ARB group (6.51 +/- 2.15, %), but significantly negatively correlated with age. Interestingly, BDKRB1 mRNA level was significantly higher and BDKRB2 mRNA level lower in the ACEI group (BDKRB1 3.88-fold +/- 1.05, BDKRB2 0.22-fold +/- 0.04) as compared to the non-ACE/ARB group (BDKRB1 1.00-fold +/- 0.39, P<0.0001, BDKRB2 1.00-fold +/- 0.45, P=0.0136). Conclusions: ACEI treatment enhances total nitrite/nitrate concentration, furthermore, upregulates BDKRB1 in PBMC, but downregulates BDKRB2 mRNA expression. FMD is a strong determinant of vascular aging and is sensitive to underlying heterogenous cardiovascular diseases.
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