Comparative reactivity of remnant-like lipoprotein particles (RLP) and low-density lipoprotein (LDL) to LDL receptor and VLDL receptor: Effect of a high-dose statin on VLDL receptor expression

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• 作者：Michiko Imagawa^a ; Sadao Takahashi^a ; ^b ; ^{sadaost@u-fukui.ac.jp} ; Yasuo Zenimaru^a ; Tomoko Kimura^a ; Jinya Suzuki^a ; Isamu Miyamori^a ; Tadao Iwasaki^c ; Hiroaki Hattori^c ; Tokuo T. Yamamoto^d ; Takamitsu Nakano^e ; ^f ; Katsuyuki Nakajima^e ; ^f
• 关键词：HMG-CoA ; hydroxymethylglutaryl-coenzyme A ; RLP ; remnant-like lipoprotein ; TGRL ; triglyceride-rich lipoprotein ; CM ; chylomicron ; LPL ; lipoprotein lipase ; WHHL ; Watanabe heritable hyperlipidemic ; FH ; familial hypercholesterolemia
• 刊名：Clinica Chimica Acta
• 出版年：2012
• 出版时间：18 February 2012
• 年：2012
• 卷：413
• 期：3-4
• 页码：441-447
• 全文大小：786 K

文摘

Background

Comparison of the reactivity of remnant-like lipoprotein particles (RLP) and LDL particles to LDL receptor and VLDL receptor has not been investigated.

Methods

LDL receptor- or VLDL receptor-transfected ldlA-7, HepG2 and L6 cells were used. Human LDL and rabbit ¦Â-VLDL were isolated by ultracentrifugation. Human RLP was isolated using an immunoaffinity mixed gel. The effect of statin on lipoprotein receptors was examined.

Results

Both LDL receptor and VLDL receptor recognized RLP. In LDL receptor transfectants, RLP, ¦Â-VLDL and LDL all bound to LDL receptor. Cold RLP competed efficiently with DiI-¦Â-VLDL; however, cold LDL competed weakly. In VLDL receptor transfectants, RLP and ¦Â-VLDL bound to VLDL receptor, but not LDL. RLP bound to VLDL receptor with higher affinity than ¦Â-VLDL because of higher apolipoprotein E in RLP. LDL receptor expression was induced in HepG2 by the low concentration of statin while VLDL receptor expression was induced in L6 myoblasts at higher concentration.

Conclusions

RLP are bound to hepatic LDL receptor more efficiently than LDL, which may explain the mechanism by which statins prevent cardiovascular risk by primarily reducing plasma RLP rather than by reducing LDL. Additionally, a high-dose of statins also may reduce plasma RLP through muscular VLDL receptor.