title: [Plasma matrix metalloproteinases-2 and -9 levels are elevated in patients with acute coronary syndrome and coronary chronic total occlusion].
abstract: OBJECTIVE
  To investigate the changes in plasma matrix metalloproteinases-2 and -9 (MMP2 and MMP9, respectively) levels in patients with different types of coronary heart diseases (CHD), and assess the value of MMP2/MMP9 detection in predicting acute coronary syndrome (ACS).
  
  
  METHODS
  According to the findings by coronary angiography and the clinical manifestations, 118 patients were divided in ACS group including 30 patients with unstable angina pectoris (UAP) and 19 with acute myocardial infarction (AMI) and non-ACS group including 23 patients with stable angina pectoris (SAP) and 21 with chronic total occlusion (CTO) of the coronary artery. Twenty-five individuals with normal coronary artery (NCA) served as the control group. Plasma levels of MMP9 and MMP2 were determined in these subjects using enzyme-linked immunosorbent assay (ELISA).
  
  
  RESULTS
  Both the ACS and non-ACS groups showed significantly higher MMP9 and MMP2 levels than the NCA group (P<0.05), and MMP2 and MMP9 levels were significantly higher in ACS group than in non-ACS group (P<0.05). Compared with the NCA group, the UAP, AMI and CTO subgroups showed obvious increases in plasma MMP2 and MMP9 levels (P<0.01). Significantly increased MMP9, but not MMP2 level was noted in AMI subgroup in comparison with SAP (P<0.01) and UAP subgroups (P<0.05); both MMP2 and MMP9 levels were elevated in CTO subgroup in comparison with those in SAP (P<0.001), UAP (P<0.01), and AMI subgroups (P<0.05).
  
  
  CONCLUSIONS
  Increased MMP2 and MMP9 levels in patients with CHD suggest the instability of the atherosclerotic plaque in correlation to the severity of ACS, and may serve as good indicators for the prediction of ACS and diagnosis of CTO of the coronary artery.
authors.affiliation: Department of Cardiology, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China. ttangqd@yahoo.com
authors.forename: Qi-dong
authors.initials: QD
authors.lastname: Tang
authors.forename: Ping-sheng
authors.initials: PS
authors.lastname: Wu
authors.forename: Yu-qing
authors.initials: YQ
authors.lastname: Hou
authors.forename: Zheng
authors.initials: Z
authors.lastname: Huang
authors.forename: Zhong-jiang
authors.initials: ZJ
authors.lastname: Zhou
authors.forename: Zhi-gang
authors.initials: ZG
authors.lastname: Guo
authors.forename: Jian-cheng
authors.initials: JC
authors.lastname: Xiu
authors.forename: Yue-gang
authors.initials: YG
authors.lastname: Wang
mesh_terms: D054058:Acute Coronary Syndrome / Q000097:blood* / Q000000981:diagnostic imaging; D000368:Aged; D000789:Angina, Unstable / Q000097:blood / Q000000981:diagnostic imaging; D002908:Chronic Disease; D017023:Coronary Angiography; D054059:Coronary Occlusion / Q000097:blood* / Q000000981:diagnostic imaging; D005260:Female; D006801:Humans; D008297:Male; D020778:Matrix Metalloproteinase 2 / Q000097:blood*; D020780:Matrix Metalloproteinase 9 / Q000097:blood*; D008675:Metamorphosis, Biological; D008875:Middle Aged; D009203:Myocardial Infarction / Q000097:blood* / Q000000981:diagnostic imaging
chemical_list: C522361:MMP2 protein, human; D020778:Matrix Metalloproteinase 2; D020780:Matrix Metalloproteinase 9