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Correlation between monocyte and T-lymphocyte activation markers in patients with acute coronary syndrome
1Cardiology Division, Cardiovascular Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
Insights
Activated monocytes and T-lymphocytes are linked in acute coronary syndrome (ACS). This study found increased activation markers in ACS patients, suggesting inflammatory cell activation plays a role in disease development.
Area of Science:
- Immunology
- Cardiology
- Biochemistry
Background:
- Increasing evidence suggests activated monocytes and T-lymphocytes are involved in coronary artery disease (CAD).
- A detailed analysis of the correlation between monocyte and T-lymphocyte activation markers in CAD is lacking.
Purpose of the Study:
- To analyze the correlation between monocyte and T-lymphocyte activation markers in patients with acute coronary syndrome (ACS).
- To investigate the role of inflammatory cell activation in the pathogenesis of ACS.
Main Methods:
- Analyzed plasma C-reactive protein (CRP) levels.
- Measured expression of CD14 and CD11b on monocytes and HLA-DR on T-lymphocytes using flow cytometry.
- Compared 25 ACS patients, 12 stable angina (SA) patients, and 23 control subjects.
Main Results:
- ACS patients showed significantly increased monocyte CD14 and CD11b expression compared to controls and SA patients.
- A higher percentage of HLA-DR positive T-lymphocytes was observed in ACS patients versus controls.
- Significant increases in plasma CRP levels and correlations among activation markers were found in ACS patients.
Conclusions:
- Activation of inflammatory cells, including monocytes and T-lymphocytes, plays a role in the pathogenesis of ACS.
- The observed correlations suggest a linked activation mechanism between monocytes and T-lymphocytes in ACS.
Abstract:
Evidence suggesting the involvement of activated monocytes and T-lymphocytes in the acute phase of coronary artery disease (CAD) has been increasing. But a detailed analysis of a correlation between monocyte and T-lymphocyte activation markers in CAD has not yet been done. We analyzed plasma C-reactive protein (CRP) levels and the expression levels of CD14 and CD11b on monocytes and the percentage of HLA-DR T-lymphocytes in 25 patients with acute coronary syndrome (ACS), 12 stable angina (SA) patients, and 23 control subjects using flow-cytometry. The expression of CD14 by monocytes was increased significantly in ACS patients (activation index 38.7 +/- 2.5, mean +/- SEM) in comparison to the control subjects (8.0 +/- 1.9) and the SA patients (16.9 +/- 3.9) (p < 0.001 and p < 0.01, respectively). The expression of CD11b by monocytes of ACS patients (4.6 +/- 0.6) was also increased significantly in comparison to control subjects (2.2 +/- 0.1) and the SA patients (2.2 +/- 0.3) (p < 0.001 for both). Also, a significantly higher percentage of HLA-DR positive T-lymphocytes (19.2 +/- 1.8 vs 13.5 +/- 1.2%, p < 0.05) was observed among ACS patients in comparison to control subjects. Significant increases in plasma CRP levels were also detected in ACS patients. Furthermore, there were statistically significant correlations among these activation markers. These results indicate that activation of inflammatory cells may play a role in the pathogenesis of ACS. The correlation between the activation status of monocytes and T-lymphocytes indicates that the activation of these immune cells is linked in such a way that activation of one type of cell may lead to the activation of another type of cell.