title: Association between IgM against an aldehyde-modified peptide in apolipoprotein B-100 and progression of carotid disease.
abstract: OBJECTIVE
  Autoantibodies against antigens in oxidized low-density lipoprotein are common in people; experimental studies suggest that these immune responses have a functional role in the disease process. The aim of this study was to evaluate the relationship between the immune response against one defined oxidized low-density lipoprotein antigen, the aldehyde-modified peptide corresponding amino acids 3136 and 3155 (MDA-p210) in apolipoprotein (apo) B-100, and progression of carotid intima media thickness (IMT).
  
  
  METHODS
  IgM and IgG against MDA-p210 were determined by enzyme-linked immunosorbent assay at baseline and after 12 months of treatment with placebo, metoprolol, fluvastatin, or metoprolol/fluvastatin in 751 individuals participating in the BCAPS. Carotid IMT was assessed by ultrasonography at baseline and after 18 and 36 months of treatment.
  
  
  RESULTS
  Antibody levels did not change in response to treatment, but high baseline MDA-p210 IgM levels were associated with a more rapid progression of carotid disease both at 18 (r=0.09, P<0.05) and 36 months (r=0.12, P<0.005). At 36 months, the difference in IMT progression rate per year between those with high MDA-p210 IgM levels and those with low was 0.011 mm (95% CI=0.005 to 0.018 mm, P<0.0001). Treatment with fluvastatin markedly decreased the progression of IMT among subjects with high but not with low MDA-p210 IgM levels. There was no association between MDA-p210 IgG and carotid IMT progression.
  
  
  CONCLUSIONS
  IgM against the aldehyde-modified peptide corresponding amino acids 3136 and 3155 in apo B-100 is common in subjects with asymptomatic carotid disease, and high levels are associated with a more rapid progression of carotid IMT. The observation that the effect of fluvastatin was restricted to subjects with high MDA-p210 IgM levels may reflect the increased rate of disease progression in this group.
authors.affiliation: Department of Clinical Sciences, Malmö University Hospital, Lund University, Malmö, Sweden. Gunilla.Nordin_Fredrikson@med.lu.se
authors.forename: Gunilla Nordin
authors.initials: GN
authors.lastname: Fredrikson
authors.forename: Bo
authors.initials: B
authors.lastname: Hedblad
authors.forename: Göran
authors.initials: G
authors.lastname: Berglund
authors.forename: Ragnar
authors.initials: R
authors.lastname: Alm
authors.forename: Jan-Ake
authors.initials: JA
authors.lastname: Nilsson
authors.forename: Alexandru
authors.initials: A
authors.lastname: Schiopu
authors.forename: Prediman K
authors.initials: PK
authors.lastname: Shah
authors.forename: Jan
authors.initials: J
authors.lastname: Nilsson
mesh_terms: D000368:Aged; D000447:Aldehydes; D000596:Amino Acids / Q000276:immunology; D000941:Antigens; D053299:Apolipoprotein B-100 / Q000276:immunology*; D001323:Autoantibodies; D002340:Carotid Artery Diseases / Q000276:immunology*; D018450:Disease Progression; D005260:Female; D006801:Humans; D007075:Immunoglobulin M; D008077:Lipoproteins, LDL / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D010455:Peptides / Q000276:immunology
chemical_list: D000447:Aldehydes; D000596:Amino Acids; D000941:Antigens; D053299:Apolipoprotein B-100; D001323:Autoantibodies; D007075:Immunoglobulin M; D008077:Lipoproteins, LDL; D010455:Peptides; C099252:oxidized low density lipoprotein