title: Modulation of atherogenic lipidome by cigarette smoke in apolipoprotein E-deficient mice.
abstract: OBJECTIVE
  Although relationships between smoking and cardiovascular diseases (CVD), and between CVD and lipids are established, the direct impact of smoking on lipidomes is not well understood. We investigated the effect of mainstream cigarette smoke (CS) exposure on plasma, liver, and aorta molecular lipid profiles, and liver transcriptome in the ApoE(-/-) mouse, a well-established mouse model for human atherogenesis.
  
  
  METHODS
  Plasma, liver, and aorta samples from ApoE(-/-) mice exposed to CS or fresh air (sham) for six months were extracted for lipids using robotic-assisted method and analyzed by mass spectrometry. Gene expression in the liver was obtained on microarrays. Development of atherosclerosis in the aorta was further assessed by plaque size in the aortic arch and lipoprotein concentration in plasma and plaque.
  
  
  RESULTS
  CS increased most lipid classes and molecular lipid species. In plasma, free cholesterol, ceramides, cerebrosides, and most phospholipids were increased in CS-exposed mice. In the liver, several lipid species including free and esterified cholesterol, triacylglycerols, phospholipids, sphingomyelins, and ceramides were elevated. In the aorta, more than 2-fold higher cholesteryl ester (CE), lysophosphatidylcholine, and glucosyl/galactosylceramide levels were seen. Moreover, CS exposure induced a significant decrease in several plasma CE and phosphatidylcholine species that contained polyunsaturated fatty acids. Genes involved in amino acid and lipid metabolism showed perturbed transcription profiles in the liver.
  
  
  CONCLUSIONS
  We have quantified some of the molecular changes that accompany the increase of plaque size that is accelerated by CS exposure in the aortae of ApoE(-/-) mice. These results suggest that specific changes in the lipidome and transcriptome, for example in ceramide and polyunsaturated fatty acid species, may be associated with atherosclerosis.
authors.affiliation: Philip Morris International R&D, Quai Jeanrenaud 5, CH-2000 Neuchâtel, Switzerland. Stephanie.Boue@pmi.com
authors.forename: Stéphanie
authors.initials: S
authors.lastname: Boué
authors.forename: Kirill
authors.initials: K
authors.lastname: Tarasov
authors.forename: Minna
authors.initials: M
authors.lastname: Jänis
authors.forename: Stefan
authors.initials: S
authors.lastname: Lebrun
authors.forename: Reini
authors.initials: R
authors.lastname: Hurme
authors.forename: Walter
authors.initials: W
authors.lastname: Schlage
authors.forename: Michael
authors.initials: M
authors.lastname: Lietz
authors.forename: Gregory
authors.initials: G
authors.lastname: Vuillaume
authors.forename: Kim
authors.initials: K
authors.lastname: Ekroos
authors.forename: Yvonne
authors.initials: Y
authors.lastname: Steffen
authors.forename: Manuel C
authors.initials: MC
authors.lastname: Peitsch
authors.forename: Reijo
authors.initials: R
authors.lastname: Laaksonen
authors.forename: Julia
authors.initials: J
authors.lastname: Hoeng
mesh_terms: D000818:Animals; D001013:Aorta, Thoracic / Q000187:drug effects* / Q000378:metabolism / Q000473:pathology; D001018:Aortic Diseases / Q000097:blood* / Q000209:etiology* / Q000235:genetics / Q000473:pathology; D001057:Apolipoproteins E / Q000172:deficiency* / Q000235:genetics; D050197:Atherosclerosis / Q000097:blood / Q000209:etiology* / Q000235:genetics / Q000473:pathology; D004195:Disease Models, Animal; D005260:Female; D020869:Gene Expression Profiling / Q000379:methods; D005786:Gene Expression Regulation; D053263:Gene Regulatory Networks; D008055:Lipids / Q000097:blood*; D008099:Liver / Q000187:drug effects* / Q000378:metabolism; D013058:Mass Spectrometry; D051379:Mice; D018345:Mice, Knockout; D020411:Oligonucleotide Array Sequence Analysis; D058226:Plaque, Atherosclerotic; D013997:Time Factors; D014028:Tobacco Smoke Pollution / Q000009:adverse effects*
chemical_list: D001057:Apolipoproteins E; D008055:Lipids; D014028:Tobacco Smoke Pollution