title: The HDL proteome in acute coronary syndromes shifts to an inflammatory profile.
abstract: Inflammation is a major factor underlying acute coronary syndromes (ACS). HDL particles may be remodeled, becoming functionally defective, under the inflammatory conditions seen in ACS. Shotgun proteomics was used to monitor changes in the HDL proteome between male age-matched control, stable CAD, and ACS subjects (n=10/group). HDL was isolated by ultracentrifugation and separated by 1D-gel followed by LC-MS/MS. We identified 67 HDL-associated proteins, 20 of which validated recently identified proteins including vitronectin and complement C4B, and 5 of which were novel. Using gene ontology analysis, we found that the HDL-proteome consisted of proteins involved in cholesterol homeostasis (~50%), with significant contributions by proteins involved in lipid binding, antioxidant, acute-phase response, immune response, and endopeptidase/protease inhibition. Importantly, levels of apoA-IV were significantly reduced in ACS patients, whereas levels of serum amyloid A (SAA) and complement C3 (C3) were significantly increased (spectral counting; t-test p≤0.05), as confirmed by immunoblot or ELISA. Despite differences in protein composition, ABCA1, ABCG1, and SR-BI mediated cholesterol efflux assays did not indicate that HDL from ACS patients is functionally deficient as compared to controls, when corrected for apoA-I mass. Our results support that the HDL proteome differs between control, CAD and ACS patients. Increased abundance of SAA, C3, and other inflammatory proteins in HDL from ACS patients suggests that HDL reflects a shift to an inflammatory profile which, in turn, might alter the protective effects of HDL on the atherosclerotic plaque. This article is part of a Special Issue entitled Advances in High Density Lipoprotein Formation and Metabolism: A Tribute to John F. Oram (1945-2010).
authors.affiliation: McGill University Health Centre, Division of Cardiology, Montreal, Quebec, Canada.
authors.forename: Khalid
authors.initials: K
authors.lastname: Alwaili
authors.forename: Dana
authors.initials: D
authors.lastname: Bailey
authors.forename: Zuhier
authors.initials: Z
authors.lastname: Awan
authors.forename: Swneke D
authors.initials: SD
authors.lastname: Bailey
authors.forename: Isabelle
authors.initials: I
authors.lastname: Ruel
authors.forename: Anouar
authors.initials: A
authors.lastname: Hafiane
authors.forename: Larbi
authors.initials: L
authors.lastname: Krimbou
authors.forename: Sylvie
authors.initials: S
authors.lastname: Laboissiere
authors.forename: Jacques
authors.initials: J
authors.lastname: Genest
mesh_terms: D054058:Acute Coronary Syndrome / Q000097:blood*; D000328:Adult; D000368:Aged; D001798:Blood Proteins / Q000378:metabolism*; D016022:Case-Control Studies; D002460:Cell Line; D002784:Cholesterol / Q000097:blood / Q000378:metabolism; D003324:Coronary Artery Disease / Q000097:blood; D006801:Humans; D007249:Inflammation / Q000097:blood*; D008075:Lipoproteins, HDL / Q000097:blood*; D008297:Male; D008875:Middle Aged; D020543:Proteome / Q000378:metabolism*
chemical_list: D001798:Blood Proteins; D008075:Lipoproteins, HDL; D020543:Proteome; D002784:Cholesterol