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Apolipoprotein a-ii inhibits high density lipoprotein remodeling and lipid-poor apolipoprotein a-i formation

Academic Article
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Overview

authors

  • Rye, K. A.
  • Wee, K.
  • Curtiss, Linda
  • Bonnet, D. J.
  • Barter, P. J.

publication date

  • June 2003

journal

  • Journal of Biological Chemistry  Journal

abstract

  • The high density lipoproteins (HDL) in human plasma are classified on the basis of apolipoprotein composition into those containing apolipoprotein (apo) A-I but not apoA-II, (A-I)HDL, and those containing both apoA-I and apoA-II, (A-I/A-II)HDL. Cholesteryl ester transfer protein (CETP) transfers core lipids between HDL and other lipoproteins. It also remodels (A-I)HDL into large and small particles in a process that generates lipid-poor, pre-beta-migrating apoA-I. Lipid-poor apoA-I is the initial acceptor of cellular cholesterol and phospholipids in reverse cholesterol transport. The aim of this study is to determine whether lipid-poor apoA-I is also formed when (A-I/A-II)rHDL are remodeled by CETP. Spherical reconstituted HDL that were identical in size had comparable lipid/apolipoprotein ratios and either contained apoA-I only, (A-I)rHDL, or (A-I/A-II)rHDL were incubated for 0-24 h with CETP and Intralipid(R). At 6 h, the apoA-I content of the (A-I)rHDL had decreased by 25% and there was a concomitant formation of lipid-poor apoA-I. By 24 h, all of the (A-I)rHDL were remodeled into large and small particles. CETP remodeled approximately 32% (A-I/A-II)rHDL into small but not large particles. Lipid-poor apoA-I did not dissociate from the (A-I/A-II)rHDL. The reasons for these differences were investigated. The binding of monoclonal antibodies to three epitopes in the C-terminal domain of apoA-I was decreased in (A-I/A-II)rHDL compared with (A-I)rHDL. When the (A-I/A-II)rHDL were incubated with Gdn-HCl at pH 8.0, the apoA-I unfolded by 15% compared with 100% for the apoA-I in (A-I)rHDL. When these incubations were repeated at pH 4.0 and 2.0, the apoA-I in the (A-I)rHDL and the (A-I/A-II)rHDL unfolded completely. These results are consistent with salt bridges between apoA-II and the C-terminal domain of apoA-I, enhancing the stability of apoA-I in (A-I/A-II)rHDL and possibly contributing to the reduced remodeling and absence of lipid poor apoA-I in the (A-I/A-II)rHDL incubations.

subject areas

  • Antibodies, Monoclonal
  • Apolipoprotein A-I
  • Apolipoprotein A-II
  • Carrier Proteins
  • Cholesterol Ester Transfer Proteins
  • Electrophoresis, Polyacrylamide Gel
  • Fat Emulsions, Intravenous
  • Glycoproteins
  • Humans
  • Kinetics
  • Lipoproteins, HDL
  • Protein Binding
  • Protein Denaturation
  • Recombinant Proteins
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Identity

International Standard Serial Number (ISSN)

  • 0021-9258

Digital Object Identifier (DOI)

  • 10.1074/jbc.M213250200

PubMed ID

  • 12690114
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Additional Document Info

start page

  • 22530

end page

  • 22536

volume

  • 278

issue

  • 25

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