Proteomic analysis of electronegative low-density lipoprotein

Cristina Bancells, Francesc Canals, Sònia Benítez, Nuria Colomé, Josep Julve, Jordi Ordóñez-Llanos, José Luis Sánchez-Quesada

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39 Citations (Scopus)

Abstract

Low density lipoprotein is a heterogeneous group of lipoproteins that differs in lipid and protein composition. One copy of apolipoprotein (apo)B accounts for over 95% of the LDL protein, but the presence of minor proteins could disturb its biological behavior. Our aim was to study the content of minor proteins in LDL subfractions separated by anion exchange chromatography. Electropositive LDL [LDL(+)] is the native form, whereas electronegative LDL [LDL(-)] is a minor atherogenic fraction present in blood. LC-ESI MS/MS analysis of both LDL fractions identified up to 28 different proteins. Of these, 13 proteins, including apoB, were detected in all the analyzed samples. LDL(-) showed a higher content of most minor proteins. Statistical analysis of proteomic data indicated that the content of apoE, apoA-I, apoC-III, apoA-II, apoD, apoF, and apoJ was higher in LDL(-) than in LDL(+). Immunoturbidimetry, ELISA, or Western blot analysis confirmed these differences. ApoJ and apoF presented the highest difference between LDL(+) and LDL(-) (>15-fold). jlr In summary, the increased content of several apolipoproteins, and specifically of apoF and apoJ, could be related to the physicochemical characteristics of LDL(-), such as apoB misfolding, aggregation, and abnormal lipid composition. Copyright © 2010 by the American Society for Biochemistry and Molecular Biology, Inc.
Original languageEnglish
Pages (from-to)3508-3515
JournalJournal of Lipid Research
Volume51
Issue number12
DOIs
Publication statusPublished - 1 Dec 2010

Keywords

  • Apolipoproteins
  • Atherosclerosis
  • Modified LDL

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