Hypertriglyceridemic subjects exhibit an accumulation of small dense chylomicron particles in the fasting state. Issue 1 (November 2015)

• Record Type: Journal Article
• Authors: Irawati, Deasy; Mamo, John C.L.; Soares, Mario J.; Slivkoff-Clark, Karin M.; James, Anthony P.
• Is Part Of: Atherosclerosis. Volume 243:Issue 1(2015)
• Page Start: 236
• Page End: 241
• Publication Date: 2015-11
• Subjects: Hypertriglyceridemia -- Chylomicron -- Apolipoprotein B-48 -- Lipoprotein fraction; Apo apolipoprotein -- BMI body mass index -- CETP cholesteryl ester transfer protein -- CRP C-reactive protein -- HDL high density lipoprotein -- HOMA-IR homeostasis model of insulin resistance -- HTG hypertriglyceridemic -- IDL intermediate density lipoprotein -- LDL low density lipoprotein -- LPL lipoprotein lipase -- NCEP-ATP National Cholesterol Education Program Adult Treatment Panel -- NEFA non-esterified fatty acid -- NTG normotriglyceridemic -- SULF2 heparan sulfate glucosamine-6-O-endosulfatase-2 -- TRL triglyceride rich lipoprotein -- Sf Svedberg flotation rate -- VLDL very low density lipoprotein; Arteriosclerosis -- Periodicals; Electronic journals; 616.136
• DOI: 10.1016/j.atherosclerosis.2015.09.018
• Languages: English
• ISSNs: 0021-9150

Abstract

Abstract: Aim: Normocholesterolemic subjects with elevated fasting plasma triglycerides are at increased risk of atherosclerosis through mechanisms that are not yet delineated. We hypothesized that elevated plasma triglyceride is associated with increased vascular exposure to pro-atherogenic lipoprotein remnants. To test this hypothesis, the abundance, and size distribution of chylomicron particles were determined in individuals with and without hypertriglyceridemia. Methods: Twelve hypertriglyceridemic subjects (HTG group, triglyceride concentration ≥1.7 mmol/L) and twelve normotriglyceridemic subjects (NTG group) matched for age and gender were studied. The distribution of chylomicron particles was assessed by determining the fasting concentration of apo B-48 in serum lipoprotein fractions with Svedberg flotation rates of (Sf) > 400, Sf 20–400 and Sf < 20. Results: The total concentration of apo B-48 in subjects with HTG was almost twice that observed in NTG controls with ∼80% of the increase residing in the Sf < 20 fraction (HTG: 8.7 ± 1.0 μg/mL vs NTG: 5.0 ± 0.6 μg/mL; P = 0.016). Significantly greater concentrations of apo B-48 were also observed in the less dense Sf 20–400 (HTG: 1.1 ± 0.2 μg/mL vs NTG: 0.4 ± 0.07 μg/mL; P < 0.001) and the Sf > 400 (HTG: 1.1 ± 0.3 μg/mL vs NTG: 0.3 ± 0.04 μg/mL; P < 0.001) fractions. An accumulation of triglyceride was also observed across all lipoprotein fractions in HTG subjects compared to NTG (Sf 400 & Sf 20–400: P < 0.001 and Sf < 20: P = 0.013). Conclusion: Normocholesterolemic, moderately hypertriglyceridemic subjects are at increased atherogenic risk due to greater apo B-48 concentration in the small, dense lipoprotein fraction. Highlights: Chylomicron size distribution was assessed in subjects with hypertriglyceridemia. Hypertriglyceridemic subjects exhibited an accumulation of small dense chylomicrons. This accumulation may in part explain their increased risk of cardiovascular disease.