Postprandial accumulation of chylomicrons and chylomicron remnants is determined by the clearance capacity.
Journal article, 2012
Objective
To better understand the postprandial clearance of triglyceride-rich lipoproteins (TRLs) and its relation to the fasting kinetics of TRLs.
Methods
Two studies were performed on 30 male subjects: a fasting kinetic study to determine the fasting secretion and clearance rates of apolipoprotein B (apoB) 100 and triglycerides in the very low-density lipoprotein 1 and 2 (VLDL1 and VLDL2) fractions; and a postprandial study to determine the postprandial accumulation of apoB48, apoB100 and triglycerides in the chylomicron, VLDL1 and VLDL2 fractions. Results from these two studies were combined to characterize the postprandial clearance of TRLs in a physiologically relevant setting.
Results
Our results show that postprandial accumulation of the apoB48-carrying chylomicrons can be predicted from the clearance capacity of the lipolytic pathway, determined in the fasting state. Furthermore, we show that chylomicrons and VLDL1 particles are not cleared equally by the lipoprotein lipase pathway, and that chylomicrons seem to be the preferred substrate. Subjects with a rapid fasting lipid metabolism accumulate lower levels of postprandial triglycerides with less accumulation of apoB100 in the VLDL1 fraction and a faster transfer of apoB100 into the VLDL2 fraction. In contrast, fasting VLDL1 secretion does not predict postprandial triglyceride accumulation.
Conclusions
Non-fasting triglyceride levels have recently been identified as a major predictor of future cardiovascular events. Here we show that the capacity of the lipolytic pathway is a common determinant of both the fasting and non-fasting triglyceride levels and may thus play an important role in the development of dyslipemia and atherosclerosis.
Postprandial Period
Fasting
metabolism
blood
Chylomicron Remnants
Male
metabolism
Adult
Lipoprotein Lipase
Lipoproteins
Middle Aged
metabolism
metabolism
Humans
metabolism
metabolism
Kinetics
Chylomicrons
Triglycerides
Apolipoprotein B-48
metabolism
Lipoproteins
VLDL
metabolism
Apolipoprotein B-100
metabolism
Author
Martin Adiels
University of Gothenburg
Chalmers, Mathematical Sciences
Niina Matikainen
Jukka Westerbacka
Sanni Söderlund
Thomas Larsson
University of Gothenburg
Sven-Olof Olofsson
University of Gothenburg
Jan Borén
University of Gothenburg
Marja-Riitta Taskinen
Atherosclerosis
1879-1484 (ISSN)
Vol. 222 1 222-8Subject Categories
Endocrinology and Diabetes
DOI
10.1016/j.atherosclerosis.2012.02.001
PubMed
22365426