Endothelial Lipase Exerts its Anti-Atherogenic Effect through Increased Catabolism of β-VLDLs

Aim: Endothelial lipase (EL) plays an important role in lipoprotein metabolism. Our recent study showed that increased hepatic expression of EL attenuates diet-induced hypercholesterolemia, thus subsequently reducing atherosclerosis in transgenic (Tg) rabbits. However, it is yet to be determined whe...

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Published in:Journal of Atherosclerosis and Thrombosis 2021/02/01, Vol.28(2), pp.157-168
Main Authors: Yan, Haizhao, Niimi, Manabu, Wang, Chuan, Chen, Yajie, Zhou, Huanjin, Matsuhisa, Fumikazu, Nishijima, Kazutoshi, Kitajima, Shuji, Zhang, Bo, Yokomichi, Hiroshi, Nakajima, Katsuyuki, Murakami, Masami, Zhang, Jifeng, Chen, Y. Eugene, Fan, Jianglin
Format: Article
Language:English
Subjects:
Atherosclerosis
Endothelial lipase
Hypercholesterolemia
Original
Transgenic rabbits
VLDL metabolism
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Summary:Aim: Endothelial lipase (EL) plays an important role in lipoprotein metabolism. Our recent study showed that increased hepatic expression of EL attenuates diet-induced hypercholesterolemia, thus subsequently reducing atherosclerosis in transgenic (Tg) rabbits. However, it is yet to be determined whether increased EL activity itself per se is anti-atherogenic or whether the anti-atherogenic effect of EL is exclusively dependent on its lipid-lowering effect. Methods: To determine the mechanisms underlying EL-mediated anti-atherogenic effect, we fed Tg and non-Tg rabbits diets containing different amounts of cholesterol to make their plasma cholesterol levels similarly high. Sixteen weeks later, we examined their lipoprotein profiles and compared their susceptibility to atherosclerosis. Results: With Tg and non-Tg rabbits having hypercholesterolemia, the plasma lipids and lipoprotein profiles were observed to be similar, while pathological examinations revealed that lesion areas of both aortic and coronary atherosclerosis of Tg rabbits were not significantly different from non-Tg rabbits. Moreover, Tg rabbits exhibited faster clearance of DiI-labeled β-VLDLs than non-Tg rabbits. Conclusion: The results of our study suggest that the enhancement of β-VLDL catabolism is the major mechanism for atheroprotective effects of EL in Tg rabbits.
ISSN:1340-3478
1880-3873
DOI:10.5551/jat.55244