Overexpression of lipoprotein lipase in transgenic rabbits leads to increased small dense LDL in plasma and promotes atherosclerosis View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

2004-05-03

AUTHORS

Tomonaga Ichikawa, Shuji Kitajima, Jingyan Liang, Tomonari Koike, Xiaofei Wang, Huijun Sun, Mitsuyo Okazaki, Masatoshi Morimoto, Hisataka Shikama, Teruo Watanabe, Nobuhiro Yamada, Jianglin Fan

ABSTRACT

Lipoprotein lipase (LPL) is a key enzyme in the hydrolysis of triglyceride-rich lipoproteins. Previous studies using transgenic mice and rabbits have demonstrated that high level of LPL activity in adipose and skeletal muscle protects against diet-induced hypercholesterolemia and subsequently prevents aortic atherosclerosis. However, it is unknown, per se, whether increased LPL activity itself is antiatherogenic, or whether the antiatherogenic effect of LPL is dependent upon the LPL lipid-lowering effect. To address this issue, we fed LPL transgenic and littermate rabbits diets containing different amounts of cholesterol (0.3–0.6%) adjusted to maintain their plasma cholesterol concentrations at similarly high levels for 16 weeks. We analyzed their lipoprotein profiles and compared their susceptibility to atherosclerosis. The results showed that the overexpression of LPL in transgenic rabbits reduced remnant lipoproteins (β-VLDL, d<1.006 g/ml) but concomitantly led to a significant increase of the large (d=1.02–1.04 g/ml) and small LDLs (d=1.04–1.06 g/ml) compared to the amounts in control rabbits. Furthermore, we found that with equally high hypercholesterolemia, transgenic rabbits developed 1.8-fold more extensive aortic atherosclerosis than control rabbits. To examine the hypothesis that altered lipoprotein profiles may be responsible for the enhanced atherosclerosis in transgenic rabbits, we studied the atherogenic properties of apoB-containing lipoproteins in vitro. These studies revealed that small-sized LDLs of transgenic rabbits were more susceptible to copper-induced oxidation and had higher affinity to biglycan than large remnant lipoproteins. We conclude, therefore, that LPL exerts a dual function in terms of its atherogenicity, namely antiatherogenicity, through enhancing receptor-mediated remnant lipoprotein catabolism and proatherogenicity via the generation of a large amount of small-sized LDLs. At an equal atherogenic-cholesterol level, small and dense LDLs are more atherogenic than large remnant lipoproteins. More... »

PAGES

715-726

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/labinvest.3700102

DOI

http://dx.doi.org/10.1038/labinvest.3700102

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1034295961

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/15122303


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