Effects of fenofibrate on endothelial function and cell adhesion molecules during post-prandial lipemia in hypertriglyceridemia
Summary
Background: Fasting and post-prandial hypertriglyceridemia have been associated with endothelial dysfunction.
Objective: To investigate the effects of a 3-month treatment with fenofibrate (200 mg daily) on endothelial reactivity and inflammatory state in hypertriglyceridemic patients at fast and after an oral fat load.
Methods: Brachial flow-mediated vasodilation (FMV) and the circulating levels of intercellular adhesion molecule (ICAM) and vascular cellular adhesion molecule (VCAM) were determined in 10 hypertriglyceridemic patients.
Results: Before treatment, post-prandial phase was characterized by an increase in triglycerides (3·7 ± 1 mmol/L at baseline vs. 4·2 ± 1, 6·5 ± 1, 6·6 ± 2, and 5·3 ± 2 mmol/L after 2, 4, 6, and 8 h), a decrease in FMV (4·3 ± 2% at baseline vs. 2·8 ± 1, 2·2 ± 1, and 1·3 ± 1% after 2, 4, and 6 h), and an increase in ICAM and VCAM. After fenofibrate there was a significant reduction in fasting triglycerides (3·7 ± 1·3 vs. 2·1 ± 0·8 mmol/L), ICAM (480 ± 113 vs. 269 ± 65 ng/mL) and VCAM (1821 ± 570 vs. 1104 ± 376 ng/mL), and an increase in FMV (4·3 ± 2 vs. 7·1 ± 2%). Post-prandially triglycerides increased (2·1 ± 1 at baseline vs. 2·4 ± 2 and 3·6 ± 1 mmol/L after 4 and 6 h), FMV decreased (7·1 ± 2 at baseline vs. 5·8 ± 2, 5·5 ± 2, 5·9 ± 2, 6·4 ± 2% after 2, 4, 6, and 8 h), and there was an increase of ICAM and VCAM. Before therapy post-prandial changes in FMV had an inverse correlation with the changes in triglycerides (r = −0·34; P < 0·05) and ICAM (r = −0·66; P < 0·001).
Conclusions: The transient endothelial dysfunction observed in hypertriglyceridemic subjects during post-prandial lipemia is mediated by post-prandial triglyceride increase and by the activation of inflammatory response. The anti-inflammatory activity of fenofibrate may represent an additional mechanism of its favorable action on the endothelial function during fasting and the post-prandial phase.