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

Michiko Imagawa, Sadao Takahashi, Yasuo Zenimaru, Tomoko Kimura, Jinya Suzuki, Isamu Miyamori, Tadao Iwasaki, Hiroaki Hattori, Tokuo T. Yamamoto, Takamitsu Nakano, Katsuyuki Nakajima

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

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 β-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, β-VLDL and LDL all bound to LDL receptor. Cold RLP competed efficiently with DiI-β-VLDL; however, cold LDL competed weakly. In VLDL receptor transfectants, RLP and β-VLDL bound to VLDL receptor, but not LDL. RLP bound to VLDL receptor with higher affinity than β-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.

Original languageEnglish
Pages (from-to)441-447
Number of pages7
JournalClinica Chimica Acta
Volume413
Issue number3-4
DOIs
Publication statusPublished - 2012 Feb 18

Keywords

  • LDL
  • LDL receptor
  • RLP
  • Statins
  • VLDL receptor

ASJC Scopus subject areas

  • Biochemistry
  • Clinical Biochemistry
  • Biochemistry, medical

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    Imagawa, M., Takahashi, S., Zenimaru, Y., Kimura, T., Suzuki, J., Miyamori, I., Iwasaki, T., Hattori, H., Yamamoto, T. T., Nakano, T., & Nakajima, K. (2012). 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. Clinica Chimica Acta, 413(3-4), 441-447. https://doi.org/10.1016/j.cca.2011.10.033