Serum soluble lectin-like oxidized low-density lipoprotein receptor-1 correlates with oxidative stress markers in stable coronary artery disease.
BACKGROUND
Although serum soluble lectin-like oxidized low-density lipoprotein receptor-1 (sLOX-1) is reported to be associated with acute coronary syndrome (ACS), its correlation with oxidative stress markers has not been elucidated. We therefore investigated the association of serum sLOX-1 with the severity of CAD, and serum biomarkers for oxidative stress and inflammation, as well as extracellular superoxide dismutase (EC-SOD), which is protective against oxidative stress in the vascular wall.


RESULTS
Ninety-four patients with stable CAD were enrolled in this study. Serum sLOX-1, serum high-sensitivity C-reactive protein (hs-CRP), urinary 8-isoprostane, plasma BNP and serum lipid levels were measured. We also measured EC-SOD at baseline and post-heparin injection. Heparin-released EC-SOD (DeltaEC-SOD) was calculated as the difference between these two values. No significant correlation was found between log (sLOX-1) and log (basal EC-SOD) (p=0.096), log (hs-CRP) (p=0.108), or log (BNP) (p=0.908) levels, log (sLOX-1) had a significant correlation with DeltaEC-SOD (r=-0.325, p=0.0014) levels and urinary 8-isoprostane levels (r=0.243, p=0.020). In the multivariable analysis, DeltaEC-SOD (p=0.0177) and 8-isoprostane (p=0.0318) were independent predictors for log (sLOX-1).


CONCLUSIONS
Serum sLOX-1 levels were positively correlated with urinary 8-isoprostane levels and inversely correlated with EC-SOD levels. These results thus suggest that increased serum sLOX-1 levels may reflect enhanced oxidative stress in vascular walls.
Kamezaki
Fumihiko
F
Yamashita
Kazuhito
K
Tasaki
Hiromi
H
Kume
Noriaki
N
Mitsuoka
Hirokazu
H
Kita
Toru
T
Adachi
Tetsuo
T
Otsuji
Yutaka
Y
D000368:Aged; D000369:Aged, 80 and over; D003324:Coronary Artery Disease / Q000378:metabolism*; D005260:Female; D006801:Humans; D008077:Lipoproteins, LDL / Q000097:blood*; D008297:Male; D008875:Middle Aged; D018384:Oxidative Stress / Q000502:physiology*; D051127:Scavenger Receptors, Class E / Q000378:metabolism*; D012720:Severity of Illness Index; D012995:Solubility; D013482:Superoxide Dismutase / Q000378:metabolism
D008077:Lipoproteins, LDL; C495137:OLR1 protein, human; D051127:Scavenger Receptors, Class E; C099252:oxidized low density lipoprotein; C441642:SOD3 protein, human; D013482:Superoxide Dismutase