title: Diabetic dyslipidemia and exercise alter the plasma low-density lipoproteome in Yucatan pigs.
abstract: Although low-density lipoprotein (LDL) plays a predominant role in atherogenesis, the low-density lipoproteome has not been fully characterized. Moreover, alterations from a Western diet, diabetes, and physical inactivity on this proteome have yet to be determined. Accordingly, relative quantification was determined in LDL proteins from male Yucatan diabetic dyslipidemic (DD) swine in the early stages of atherosclerosis compared to healthy control (C) and non-diabetic hyperlipidemic (H) swine. Importantly, coronary vascular dysfunction was prevented by aerobic exercise training in these animals (DDX) without altering total LDL concentration. Using 2-DE, Western blot, label-free quantitative MS, and selected reaction monitoring, alterations in the abundance of apolipoproteins A-I, B, C-III, D, E, and J and noncovalently associated proteins were determined in LDL isolated using fast protein liquid chromatography. At least 28 unique proteins, many of which were novel, were identified with high confidence. An apolipoprotein E isoform demonstrated stronger correlation to disease (percent of coronary artery segments with intimal thickening) than some traditional risk factors (total cholesterol, LDL cholesterol, and LDL/HDL cholesterol). Taken together, this work identifies new possible biomarkers, potential therapeutic targets for atherosclerosis, and generates new hypotheses regarding the role of LDL in atherogenesis.
authors.affiliation: Department of Cellular & Integrative Physiology, Indiana University School of Medicine, Indianapolis, IN 46202, USA.
authors.forename: Matthew R
authors.initials: MR
authors.lastname: Richardson
authors.forename: Xianyin
authors.initials: X
authors.lastname: Lai
authors.forename: Joseph L
authors.initials: JL
authors.lastname: Dixon
authors.forename: Michael
authors.initials: M
authors.lastname: Sturek
authors.forename: Frank A
authors.initials: FA
authors.lastname: Witzmann
mesh_terms: D000704:Analysis of Variance; D000818:Animals; D002853:Chromatography, Liquid; D048909:Diabetes Complications / Q000378:metabolism*; D004036:Diet, Atherogenic; D004195:Disease Models, Animal; D050171:Dyslipidemias / Q000378:metabolism*; D015180:Electrophoresis, Gel, Two-Dimensional; D005786:Gene Expression Regulation; D016014:Linear Models; D008077:Lipoproteins, LDL / Q000097:blood*; D008297:Male; D008958:Models, Molecular; D010805:Physical Conditioning, Animal; D013552:Swine; D053719:Tandem Mass Spectrometry
chemical_list: D008077:Lipoproteins, LDL