Journal
CIRCULATION
Volume 117, Issue 5, Pages 678-685Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1161/CIRCULATIONAHA.107.707349
Keywords
cardiovascular diseases; inflammation; lipids; obesity
Funding
- NCRR NIH HHS [M01-RR00040] Funding Source: Medline
- NHLBI NIH HHS [K23 HL74967-01A1, R01HL1073278, R01 HL55323] Funding Source: Medline
- NIDDK NIH HHS [DK19525] Funding Source: Medline
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Background - Endothelial lipase (EL) is a plasma lipase that we previously reported to be significantly correlated with all features of the metabolic syndrome in humans, including directly with measures of adiposity and inversely with high-density lipoprotein cholesterol levels. We hypothesized that inflammation associated with obesity results in upregulation of EL. We determined the relationship between inflammatory markers and EL levels in a cohort of healthy persons recruited on the basis of family history of coronary disease. Furthermore, we directly tested the hypothesis that plasma EL concentrations would increase with induction of an inflammatory state by low-dose endotoxin in humans. Methods and Results - High-sensitivity C-reactive protein, interleukin 6, soluble tumor necrosis factor receptor II, soluble intercellular adhesion molecule 1, leptin, and adiponectin were measured in plasma of 858 subjects. Significant direct correlations (P<0.001 for all) were found between EL concentrations and high-sensitivity C-reactive protein (r=0.28), interleukin-6 (r=0.22), soluble tumor necrosis factor receptor II (r=0.22), soluble intercellular adhesion molecule 1 (r=0.24), and leptin (r=0.20). An inverse correlation was present with adiponectin (r=-0.15, P<0.001). Adiponectin inhibited the tumor necrosis factor-alpha-stimulated EL secretion from cultured human coronary endothelial cells in a dose-dependent manner. Experimental low-dose endotoxemia in 20 subjects resulted in a 2.5-fold increase in EL concentrations 12 to 16 hours after injection, which correlated temporally with decreases in both total and high-density lipoprotein phospholipid. Conclusions - In humans, plasma inflammatory markers are directly correlated with plasma EL concentrations, and experimental endotoxemia significantly increases plasma EL concentrations, proving that EL is upregulated by inflammation in humans. This mechanism may partially explain the low high-density lipoprotein cholesterol levels seen in obesity and metabolic syndrome.
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