Relation between upregulation of CD40 system and complex stenosis morphology in patients with acute coronary syndrome
Jin-chuan Yan1, Zong-gui Wu, Xian-tao Kong
1Department of Cardiology, Affiliated Zhong Da Hospital, Southeast University, Nanjing 210009, China. yanjinchuan@hotmail.com
Insights
Acute coronary syndrome (ACS) patients exhibit elevated CD40 ligand expression, linked to matrix metalloproteinases and unstable atherosclerotic plaques. This suggests CD40L may predict ACS severity.
Area of Science:
- Cardiovascular Medicine
- Immunology
- Biochemistry
Background:
- Atherosclerotic plaque instability is a key factor in acute coronary syndromes (ACS).
- The CD40-CD40 ligand (CD40L) system plays a role in inflammation and thrombosis.
- Matrix metalloproteinases (MMPs) are implicated in extracellular matrix degradation and plaque rupture.
Purpose of the Study:
- To investigate the relationship between the CD40-CD40L system, matrix metalloproteinases (MMPs), and coronary atherosclerotic plaque stability in ACS patients.
- To determine if CD40 and CD40L expression correlates with ACS severity.
Main Methods:
- Flow cytometry was used to analyze CD40 and CD40L expression on platelets in 56 ACS patients (including stable angina, unstable angina, and acute myocardial infarction) and 16 controls.
- Serum levels of soluble CD40L (sCD40L), MMP-3, and MMP-9 were measured using ELISA.
- Coronary stenosis morphology was assessed via angiography.
Main Results:
- ACS patients showed significantly increased coexpression of CD40 and CD40L on platelets compared to controls and stable angina patients (P<0.01).
- Elevated serum sCD40L, MMP-3, and MMP-9 levels were observed in ACS patients.
- Positive correlations were found between MMP-9, MMP-3, CD40L expression, and sCD40L levels. sCD40L concentration correlated with complex coronary stenoses (r=0.60, P<0.01).
Conclusions:
- Increased CD40 system coexpression, particularly CD40L, in ACS patients contributes to a proinflammatory and prothrombotic state.
- This upregulation may exacerbate atherosclerosis development and plaque instability.
- CD40L may serve as a valuable biomarker for predicting ACS severity.
Aim:
To investigate whether upregulation of CD40-CD40 ligand system is related to matrix metalloproteinases level and stability of coronary atherosclerotic plaque in patients with acute coronary syndrome (ACS).
Methods:
Sixteen normal controls and 56 patients including 24 with stable angina (SA), 20 with unstable angina (UA), and 12 with acute myocardial infarction (AMI) were investigated. The expression of CD40 and CD40L on platelet was analyzed by flow cytometry. Serum soluble CD40L (sCD40L), MMP-9 and MMP-3 level was determined by ELISA. All coronary stenosis with > or =30% diameter reduction were assessed by angiographic coronary stenosis morphology.
Results:
Patients with ACS showed a significant increase of CD40 (75 +/- 12 MIF) and CD40L (13 +/- 4 MIF) coexpression on platelets compared with control and SA group (P<0.01). sCD40L also showed higher level in patients with ACS (10.2 +/- 3.5 microg/L) than in control (3.1 +/- 1.4 microg/L, P<0.01) and SA group (3.3 +/- 1.6 microg/L, P<0.01). Serum MMP-3 and MMP-9 in patients with ACS were two times greater than those in control. A positive correlation was found between MMP-9, MMP-3, and CD40L expression on platelets as well as sCD40L levels, but not for CD40 expression on platelets. An obvious correlation was also observed between sCD40L concentration and complex coronary stenoses (r=0.60, P<0.01).
Conclusion:
Patients with ACS show increased coexpression of CD40 system, especially expression of CD40L, which may create a proinflammatory and prothrombotic milieu for aggravating the development of atherosclerosis and instability of atherosclerotic plaques, and may be a valuable marker for predicting the severity of ACS.
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