15-Lipoxygenase-mediated modification of high-density lipoproteins impairs SR-BI- and ABCA1-dependent cholesterol efflux from macrophages

Angela Pirillo, Patrizia Uboldi, Hartmut Kuhn, Alberico L. Catapano

Research output: Contribution to journalArticlepeer-review


Elevated plasma levels of high-density lipoprotein cholesterol (HDL-C) are atheroprotective and HDL-dependent reverse cholesterol transport has been related to this effect. HDL particles may, however, undergo modifications that affect their biological activities. Lipoxygenases (LOs) belong to a family of lipid peroxidizing enzymes; among them, reticulocyte-type 15-lipoxygenase (15-LO-1) appears to play a pathophysiological role in atherosclerosis, as its expression is increased in atherosclerotic plaques and it has been shown to oxidize low-density lipoproteins to an atherogenic form. In this work we investigated the impact of in vitro 15-lipoxygenase-catalyzed modification of HDL3 on their ability to act as cholesterol acceptor and found that 15-LO-modified HDL3 were less effective in mediating cholesterol efflux from lipid-laden J774 cells. A reduced binding of 15-LO-modified HDL3 to scavenger receptor class B, type I (SR-BI), due to HDL apoproteins cross-linking, explained, at least in part, the observed reduction of cholesterol efflux. In addition, ATP-binding cassette transporter A1 (ABCA1)-mediated cholesterol efflux was also reduced, as a consequence of pre-β-particles loss after HDL3 modification. These results suggest that 15-lipoxygenase might induce structural alterations of HDL3 particles that impair their capability of triggering reverse cholesterol transport.

Original languageEnglish
Pages (from-to)292-300
Number of pages9
JournalBiochimica et Biophysica Acta - Molecular and Cell Biology of Lipids
Issue number3
Publication statusPublished - Mar 2006


  • 15-lipoxygenase
  • ATP-binding cassette transporter A1
  • High-density lipoprotein
  • Reverse cholesterol transport
  • Scavenger receptor class B, type I

ASJC Scopus subject areas

  • Cell Biology
  • Molecular Biology
  • Biophysics


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