Journal
JOURNAL OF NUTRITION AND METABOLISM
Volume 2019, Issue -, Pages -Publisher
HINDAWI LTD
DOI: 10.1155/2019/7078241
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Funding
- Intramural Research Program of the National Institutes of Health funds from the National Heart, Lung, and Blood Institute
- NATIONAL HEART, LUNG, AND BLOOD INSTITUTE [ZIAHL006095] Funding Source: NIH RePORTER
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Aim. Plasma apolipoprotein C-II (apoC-II) activates lipoprotein lipase (LPL) and thus lowers plasma triglycerides (TG). We previously reported that a human apoC-II mimetic peptide (C-II-a) decreased plasma TG in apoC-II mutant mice, as well as in apoE-knockout mice. Because it is unknown what tissues take up free fatty acids (FFAs) released from TG after C-II-a peptide administration, we investigated in mice TG plasma clearance and tissue incorporation, using H-3-triolein as a tracer, with and without C-II-a treatment. Methods and Results. Intralipid (R) fat emulsion was labeled with H-3-triolein and then mixed with or without C-II-a. Addition of the peptide did not alter mean particle size of the lipid emulsion particles (298nm) but accelerated their plasma clearance. After intravenous injection into C57BL/6N mice, the plasma half-life of the H-3-triolein for control and C-II-a treated emulsions was 18.3 +/- 2.2min and 14.8 +/- 0.1min, respectively. In apoC-II mutant mice, the plasma half-life of H-3-triolein for injected control and C-II-a treated emulsions was 30.1 +/- 0.1min and 14.8 +/- 0.1min, respectively. C57BL/6N and apoC-II mutant mice at 120minutes after the injection showed increased tissue incorporation of radioactivity in white adipose tissue when C-II-a treated emulsion was used. Higher radiolabeled uptake of lipids from C-II-a treated emulsion was also observed in the skeletal muscle of C57BL/6N mice only. In case of apoC-II mutant mice, decreased uptake of radioactive lipids was observed in the liver and kidney after addition of C-II-a to the lipid emulsion. Conclusions. C-II-a peptide promotes the plasma clearance of TG-rich lipid emulsions in wild type and apoC-II mutant mice and promotes the incorporation of fatty acids from TG in the lipid emulsions into specific peripheral tissues.
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