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Endothelial lipase mediates HDL levels in normal and hyperlipidemic rabbits. | LitMetric

Aim: Existing evidence suggests that endothelial lipase (EL) plays an important role in high-densitylipoprotein (HDL) metabolism. Because rabbits are a useful animal model for the study of human lipid metabolism and atherosclerosis, we characterized rabbit EL (rEL) expression and investigated its relationship with plasma HDL levels in normal and hyperlipidemic rabbits.

Methods: We cloned the rEL cDNA and analyzed the EL tissue expression using Northern blotting, real-time RT-PCR, Western blotting, and in situ hybridization. We evaluated the effects of rEL antisense on plasma HDL levels.

Results: We found that rEL mRNA was highly expressed in cholesterol synthesis-related organs, including the liver, testis, and adrenal along with its expression in the lung, kidney, bone marrow, and small intestine. Interestingly, Watanabe heritable hyperlipidemic (WHHL) rabbits, a model of human familial hypercholesterolemia, had lower plasma levels of HDLs than normal rabbits. The plasma HDL levels in WHHL rabbits were inversely associated with high levels of plasma rEL proteins and hepatic expression of rEL mRNA. Injection of rEL-specific antisense oligonucleotides into rabbits resulted in the elevation of plasma large HDLs. Furthermore, we demonstrated that rEL mRNA was expressed by both endothelial cells and macrophages in the lesions of aortic atherosclerosis of WHHL rabbits.

Conclusions: rEL is expressed in multiple tissues and may have many physiological and pathophysiological functions, such as in the regulation of cholesterol metabolism and atherosclerosis. Our results suggest that EL is an important regulator of plasma HDL levels in rabbits.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3493565PMC
http://dx.doi.org/10.5551/jat.11148DOI Listing

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