To detect the levels of index related to inflammation such as soluble CD40 ligand (sCD40L), neutrophil collagenase-8 (MMP-8), and pregnancy associated plasma protein-A (PAPP-A) , lipid peroxidation and autoimmune indexes such as oxidized low density lipoprotein (ox-LDL) and its antibody (ox-LDL Ab) in patients with coronary heart disease, and to investigate its relationship with acute coronary syndrome (ACS).
Contents of sCD40L, MMP-8, PAPP-A, ox-LDL and ox-LDL Ab in the peripheral blood were measured by enzyme-linked immunosorbent assay from 109 patients with coronary heart disease including 36 acute myocardial infarction (AMI), 38 unstable angina pectoris (UAP), and 35 stable angina pectoris (SAP) and 36 controls without coronary heart disease.
The levels of each index in the peripheral blood of ACS patients (including AMI and UAP) were higher than those of SAP patients and controls (P < 0.05), and the difference of each index between UAP group and AMI group in ACS patients had no statistical significance (P > 0.05). The levels of each index of SAP patients, except PAPP-A, were all higher than those of controls (P <0.05). All the indexes were helpful in diagnosis of ACS. The area under the ROC curve of each index is between 0.7 and 0.9.
The increase of sCD40L, MMP-8, PAPP-A, ox-LDL and ox-LDL Ab levels in peripheral blood may be related to the pathogenesis of ACS, and can be used as potential markers of unstable atherosclerosis plaque.