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Incubation of MDCO-216 (ApoA-IMilano/POPC) with Human Serum Potentiates ABCA1-Mediated Cholesterol Efflux Capacity, Generates New Prebeta-1 HDL, and Causes an Increase in HDL Size.
Kempen, Herman J; Schranz, Dorota B; Asztalos, Bela F; Otvos, James; Jeyarajah, Elias; Drazul-Schrader, Denise; Collins, Heidi L; Adelman, Steven J; Wijngaard, Peter L J.
Afiliação
  • Kempen HJ; The Medicines Company (Schweiz) GmbH, Talstrasse 59, 8002 Zürich, Switzerland.
  • Schranz DB; Pacific Biomarkers LLC, 645 Elliott Avenue West, Suite 300, Seattle, WA 98119, USA.
  • Asztalos BF; Lipid Metabolism Laboratory, Tufts University, 711 Washington Street, Boston, MA 02111, USA.
  • Otvos J; Liposcience LLC, 2500 Sumner Boulevard, Raleigh, NC 27616, USA.
  • Jeyarajah E; Liposcience LLC, 2500 Sumner Boulevard, Raleigh, NC 27616, USA.
  • Drazul-Schrader D; Vascular Strategies LLC, 5110 Campus Drive, Suite 150, Plymouth Meeting, PA 19462, USA.
  • Collins HL; Vascular Strategies LLC, 5110 Campus Drive, Suite 150, Plymouth Meeting, PA 19462, USA.
  • Adelman SJ; Vascular Strategies LLC, 5110 Campus Drive, Suite 150, Plymouth Meeting, PA 19462, USA.
  • Wijngaard PL; The Medicines Company (Schweiz) GmbH, Talstrasse 59, 8002 Zürich, Switzerland.
J Lipids ; 2014: 923903, 2014.
Article em En | MEDLINE | ID: mdl-25478232
MDCO-216 is a complex of dimeric ApoA-IMilano and palmitoyl oleoyl phosphatidylcholine (POPC), previously shown to reduce atherosclerotic plaque burden. Here we studied the effect of incubation of human plasma or serum with MDCO-216 on cholesterol efflux capacity from J774 cells, on prebeta-1 high density lipoprotein (prebeta-1 HDL) and on HDL size assessed by proton nuclear magnetic resonance ((1)H-NMR). MDCO-216 incubated in buffer containing 4% human serum albumin stimulated both ABCA1-mediated efflux and ABCA1-independent cholesterol efflux from J774 macrophages. When incubated with human serum a dose- and time-dependent synergistic increase of the ABCA1-mediated efflux capacity were observed. Using a commercially available ELISA for prebeta-1 HDL, MDCO-216 as such was poorly detected (12-15% of nominal amount of protein). Prebeta-1 HDL was rapidly lost when human plasma alone is incubated at 37°C. In contrast, incubation of human plasma with MDCO-216 at 37°C produced a large amount of new prebeta-1 HDL. Native 2D electrophoresis followed by immunoblotting with an apoA-I antibody, which also detects ApoA-I Milano, confirmed the increase in prebeta-1 HDL upon incubation at 37°C. With the increase of prebeta-1 HDL, the concomitant disappearance of the small alpha-3 and alpha-4 HDL and MDCO-216 and an increase in the large alpha-1 and alpha-2 HDL were observed. Immunoblotting with Mab 17F3 specific for ApoA-I Milano showed the appearance of ApoA-I Milano in alpha-1 and alpha-2, but not in prebeta-1 HDL. (1)H-NMR analysis of plasma incubated with MDCO-216 confirmed rapid disappearance of small-sized HDL particles and increase of medium- and large-sized HDL particles accompanied with a decrease in total HDL particle number. In conclusion, incubation of human plasma or serum with MDCO-216 strongly enhanced ABCA1-mediated cholesterol efflux, caused a strong increase of prebeta-1 HDL, and drastically changed the distribution of HDL subpopulations. Overall, the results are in line with the hypothesis that MDCO-216 fuses with small alpha-migrating HDL particles forming larger particles containing both apoA-I WT and ApoA-I Milano, meanwhile liberating the endogenous wild-type apoA-I which enriches prebeta-1 HDL subpopulation.

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2014 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2014 Tipo de documento: Article