Association of increased S100B, S100A6 and S100P in serum levels with acute coronary syndrome and also with the severity of myocardial infarction in cardiac tissue of rat models with ischemia-reperfusion injury

Objective: We aim to check if serum levels of receptor for advanced glycation endproduct (RAGE) ligands S100B, S100A6 and S100P were related to myocardial injury in acute coronary syndrome (ACS). Methods: Serum levels of S100B, S100A6, S100P, and soluble RAGE (sRAGE) were analyzed in 882 patients. Based upon clinical and laboratory findings, they were assigned into control (n = 251), stable angina (n = 211), and ACS (n = 420). To verify clinical data of ACS, forty Sprague-Dawley rats were subjected to cardiac ischemia-reperfusion (I/R) injury by occluding proximal (large infarct size; n = 20) or distal (small infarct size; n = 20) left anterior descending coronary artery, and another 20 rats were in sham-operation group. The expressions of S100B, S100A6, S100P and RAGE in the myocardium were analyzed. Results: Serum levels of S100B, S100A6 and S100P were higher in ACS group than in stable angina and control groups, and sRAGE levels were higher in ACS patients versus controls (all p < 0.01). S100B and S100P levels correlated significantly with CK-MB and troponin I levels in ACS group (all p < 0.05). In multivariable regression analysis, S100B, S100A6, S100P and conventional risk factors were independently associated with ACS. In animal models, the expressions of S100B, S100A6 and S100P were closely related to infarct size (all p < 0.05). Conclusion: This study indicates that serum levels of S100B, S100A6 and S100P are associated with ACS, and serum levels and myocardial expression of these proteins are related to infarct size. (C) 2011 Elsevier Ireland Ltd. All rights reserved.