Apolipoprotein C-III deficiency accelerates triglyceride hydrolysis by lipoprotein lipase in wild-type and apoE knockout mice
Previous studies with hypertriglyceridemic APOC3 transgenic mice have suggested that apolipoprotein C-III (apoC-III) may inhibit either the apoE-mediated hepatic uptake of TG-rich lipoproteins and/or the lipoprotein lipase (LPL)-mediated hydrolysis of TG. Accordingly, apoC3 knockout (apoC3−/−) mice...
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doaj-b7db1849ec62483f8e3fa152767827422021-04-27T04:42:15ZengElsevierJournal of Lipid Research0022-22752001-10-01421015781585Apolipoprotein C-III deficiency accelerates triglyceride hydrolysis by lipoprotein lipase in wild-type and apoE knockout miceMiek C. Jong0Patrick C.N. Rensen1Vivian E.H. Dahlmans2Hans van der Boom3Theo J.C. van Berkel4Louis M. Havekes5TNO-Prevention and Health, Gaubius Laboratory, 2301 CE Leiden, The NetherlandsDivision of Biopharmaceutics, Leiden/Amsterdam Center for Drug Research, University of Leiden, Sylvius Laboratory, 2300 RA Leiden, The NetherlandsTNO-Prevention and Health, Gaubius Laboratory, 2301 CE Leiden, The NetherlandsTNO-Prevention and Health, Gaubius Laboratory, 2301 CE Leiden, The NetherlandsDivision of Biopharmaceutics, Leiden/Amsterdam Center for Drug Research, University of Leiden, Sylvius Laboratory, 2300 RA Leiden, The NetherlandsTNO-Prevention and Health, Gaubius Laboratory, 2301 CE Leiden, The Netherlands; Departments of Cardiology and Internal Medicine, Leiden University Medical Center, 2300 RC Leiden, The Netherlands; TNO-Prevention and Health, Gaubius Laboratory Zernikedreef 9, P.O. Box 2215 Leiden 2301 CE, The NetherlandsPrevious studies with hypertriglyceridemic APOC3 transgenic mice have suggested that apolipoprotein C-III (apoC-III) may inhibit either the apoE-mediated hepatic uptake of TG-rich lipoproteins and/or the lipoprotein lipase (LPL)-mediated hydrolysis of TG. Accordingly, apoC3 knockout (apoC3−/−) mice are hypotriglyceridemic. In the present study, we attempted to elucidate the mechanism(s) underlying these phenomena by intercrossing apoC3−/− mice with apoE−/− mice to study the effects of apoC-III deficiency against a hyperlipidemic background. Similar to apoE+/+ apoC3−/− mice, apoE−/−apoC3−/− mice exhibited a marked reduction in VLDL cholesterol and TG, indicating that the mechanism(s) by which apoC-III deficiency exerts its lipid-lowering effect act independent of apoE. On both backgrounds, apoC3−/− mice showed normal intestinal lipid absorption and hepatic VLDL TG secretion. However, turnover studies showed that TG-labeled emulsion particles were cleared much more rapidly in apoC3−/− mice, whereas the clearance of VLDL apoB, as a marker for whole particle uptake by the liver, was not affected. Furthermore, it was shown that cholesteryl oleate-labeled particles were also cleared faster in apoC3−/− mice. Thus the mechanisms underlying the hypolipidemia in apoC3−/− mice involve both a more efficient hydrolysis of VLDL TG as well as an enhanced selective clearance of VLDL cholesteryl esters from plasma.In summary, our studies of apoC3−/− mice support the concept that apoC-III is an effective inhibitor of VLDL TG hydrolysis and reveal a potential regulating role for apoC-III with respect to the selective uptake of cholesteryl esters.http://www.sciencedirect.com/science/article/pii/S0022227520322112hypercholesterolemiatransgenic micetriglyceride metabolism |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Miek C. Jong Patrick C.N. Rensen Vivian E.H. Dahlmans Hans van der Boom Theo J.C. van Berkel Louis M. Havekes |
spellingShingle |
Miek C. Jong Patrick C.N. Rensen Vivian E.H. Dahlmans Hans van der Boom Theo J.C. van Berkel Louis M. Havekes Apolipoprotein C-III deficiency accelerates triglyceride hydrolysis by lipoprotein lipase in wild-type and apoE knockout mice Journal of Lipid Research hypercholesterolemia transgenic mice triglyceride metabolism |
author_facet |
Miek C. Jong Patrick C.N. Rensen Vivian E.H. Dahlmans Hans van der Boom Theo J.C. van Berkel Louis M. Havekes |
author_sort |
Miek C. Jong |
title |
Apolipoprotein C-III deficiency accelerates triglyceride hydrolysis by lipoprotein lipase in wild-type and apoE knockout mice |
title_short |
Apolipoprotein C-III deficiency accelerates triglyceride hydrolysis by lipoprotein lipase in wild-type and apoE knockout mice |
title_full |
Apolipoprotein C-III deficiency accelerates triglyceride hydrolysis by lipoprotein lipase in wild-type and apoE knockout mice |
title_fullStr |
Apolipoprotein C-III deficiency accelerates triglyceride hydrolysis by lipoprotein lipase in wild-type and apoE knockout mice |
title_full_unstemmed |
Apolipoprotein C-III deficiency accelerates triglyceride hydrolysis by lipoprotein lipase in wild-type and apoE knockout mice |
title_sort |
apolipoprotein c-iii deficiency accelerates triglyceride hydrolysis by lipoprotein lipase in wild-type and apoe knockout mice |
publisher |
Elsevier |
series |
Journal of Lipid Research |
issn |
0022-2275 |
publishDate |
2001-10-01 |
description |
Previous studies with hypertriglyceridemic APOC3 transgenic mice have suggested that apolipoprotein C-III (apoC-III) may inhibit either the apoE-mediated hepatic uptake of TG-rich lipoproteins and/or the lipoprotein lipase (LPL)-mediated hydrolysis of TG. Accordingly, apoC3 knockout (apoC3−/−) mice are hypotriglyceridemic. In the present study, we attempted to elucidate the mechanism(s) underlying these phenomena by intercrossing apoC3−/− mice with apoE−/− mice to study the effects of apoC-III deficiency against a hyperlipidemic background. Similar to apoE+/+ apoC3−/− mice, apoE−/−apoC3−/− mice exhibited a marked reduction in VLDL cholesterol and TG, indicating that the mechanism(s) by which apoC-III deficiency exerts its lipid-lowering effect act independent of apoE. On both backgrounds, apoC3−/− mice showed normal intestinal lipid absorption and hepatic VLDL TG secretion. However, turnover studies showed that TG-labeled emulsion particles were cleared much more rapidly in apoC3−/− mice, whereas the clearance of VLDL apoB, as a marker for whole particle uptake by the liver, was not affected. Furthermore, it was shown that cholesteryl oleate-labeled particles were also cleared faster in apoC3−/− mice. Thus the mechanisms underlying the hypolipidemia in apoC3−/− mice involve both a more efficient hydrolysis of VLDL TG as well as an enhanced selective clearance of VLDL cholesteryl esters from plasma.In summary, our studies of apoC3−/− mice support the concept that apoC-III is an effective inhibitor of VLDL TG hydrolysis and reveal a potential regulating role for apoC-III with respect to the selective uptake of cholesteryl esters. |
topic |
hypercholesterolemia transgenic mice triglyceride metabolism |
url |
http://www.sciencedirect.com/science/article/pii/S0022227520322112 |
work_keys_str_mv |
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