MATERIALS AND METHODS

20 patients undergoing routine carotid endarterectomy and 40 healthy volunteers were enrolled in this study. MMPs activity and OPG and FN concentrations were measured in atherosclerotic plaques and nonchanged contiguous tissue after homogenization as well as in plasma from patients and reference group. The activity of MMPs was evaluated by gelatin zymography, and the concentration of OPG and FN was assessed by ELISA.

RESULTS

OPG concentration and MMP-9 activity showed differences between plaque and nonchanged tissue; OPG was higher in adjacent tissue (=0.0009), whereas MMP-9 was higher in plaque (proMMP-9 =0.0003; MMP-9 < 0.0001). The OPG plasma concentration and both MMPs plasma activity were higher in patients (OPG < 0.001; proMMP-2 =0.0292; and proMMP-9 =0.0374), while FN plasma concentration was lower in patients than in the reference group (=0.0004). The ROC curves analysis showed the highest AUC for OPG (0.943) with 85.0% sensitivity and 92.1% specificity.

CONCLUSIONS

The atherosclerotic plaque and the contiguous artery wall are biochemically different. OPG shows the highest potential to be a marker of advanced carotid atherosclerosis.