title: Relationship between plasma osteopontin and oxidative stress in patients with coronary artery disease.
abstract: BACKGROUND
  It is known that oxidative stress plays an important role in the pathogenesis of atherosclerosis and that an association exists between osteopontin (OPN) and atherosclerosis.
  
  
  OBJECTIVE
  It was proposed that malondialdehyde (MDA), a biomarker of lipid peroxidation and oxidative stress, would be related to plasma OPN levels in patients with coronary artery disease (CAD).
  
  
  RESULTS
  Plasma OPN and MDA levels were measured in 71 patients (60 males and 11 females; mean age 61.7 +/- 10 years). Fifty-eight patients had significant CAD (group I) and 13 patients were free of CAD as defined angiographically (group II). Plasma OPN was measured by enzyme-linked immunosorbent assay (ELISA), while MDA was determined spectrophotometrically. Multivariate regression analysis revealed that ln-transformed OPN levels were independently associated with MDA after adjustment for age, hypertension and diabetes mellitus (R(2) = 0.278, p = 0.0004 and beta regression coefficient = 0.252 [standard error = 0.0958], p = 0.011). OPN and MDA levels were higher in patients with diabetes (73.6 +/- 36.2 ng/ml versus 56.1 +/- 30.9 ng/ml, p = 0.02 and 2.5 +/- 0.5 microM versus 2.0 +/- 0.5 microM, p = 0.002, respectively).
  
  
  CONCLUSIONS
  The association between OPN and MDA levels in patients with CAD suggests an interaction between OPN and oxidative stress. This interaction may play a role in the pathogenesis of atherosclerosis.
authors.affiliation: University of Athens, Second University Department of Cardiology, Medical School, Attikon General Hospital, 1 Rimini Street 124 62, Athens, Greece. pg171@hlk.forthnet.gr
authors.forename: P
authors.initials: P
authors.lastname: Georgiadou
authors.forename: E K
authors.initials: EK
authors.lastname: Iliodromitis
authors.forename: C
authors.initials: C
authors.lastname: Varounis
authors.forename: M
authors.initials: M
authors.lastname: Mavroidis
authors.forename: F
authors.initials: F
authors.lastname: Kolokathis
authors.forename: I
authors.initials: I
authors.lastname: Andreadou
authors.forename: S
authors.initials: S
authors.lastname: Psarras
authors.forename: Y
authors.initials: Y
authors.lastname: Capetanaki
authors.forename: H
authors.initials: H
authors.lastname: Boudoulas
authors.forename: D Th
authors.initials: DT
authors.lastname: Kremastinos
mesh_terms: D000328:Adult; D000368:Aged; D003327:Coronary Disease / Q000097:blood* / Q000378:metabolism; D003920:Diabetes Mellitus / Q000097:blood; D005260:Female; D006801:Humans; D016014:Linear Models; D008297:Male; D008315:Malondialdehyde / Q000097:blood; D008875:Middle Aged; D053495:Osteopontin / Q000097:blood*; D018384:Oxidative Stress / Q000502:physiology*; D012307:Risk Factors
chemical_list: D053495:Osteopontin; D008315:Malondialdehyde