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Acute T-cell activation is detectable in unstable angina
G G Neri Serneri1, D Prisco, F Martini
1Clinica Medica Generale e Cardiologia, Florence, Italy.
Circulation
|April 1, 1997
Summary
Circulating lymphocytes, specifically CD4+ and CD8+ T-cells, show activation in unstable angina patients for up to 8 weeks. This immune response is linked to inflammation, not myocardial ischemia.
Area of Science:
- Cardiology
- Immunology
- Inflammation Research
Background:
- Emerging evidence suggests inflammation plays a key role in unstable angina.
- This study investigates the involvement of circulating lymphocytes in the inflammatory processes of unstable angina.
Purpose of the Study:
- To determine if circulating lymphocytes are activated in patients experiencing unstable angina.
- To assess the duration and characteristics of lymphocyte activation in unstable angina.
Main Methods:
- Flow cytometry was used to analyze early (IL-2R, CD25, CD71) and late (HLA-DR) antigen expression on lymphocytes.
- Plasma levels of soluble IL-2R (sIL-2R) were measured using ELISA.
- Lymphocyte activation markers were assessed in patients with unstable angina, stable angina, and healthy controls over a 90-day period.
Main Results:
- Patients with unstable angina exhibited significantly higher numbers of HLA-DR+ CD3 lymphocytes and elevated sIL-2R levels compared to controls.
- Both CD4+ and CD8+ lymphocytes expressed HLA-DR, indicating activation.
- Lymphocyte activation was more pronounced in patients requiring urgent revascularization and gradually decreased over 8-12 weeks.
Conclusions:
- Circulating CD4+ and CD8+ lymphocytes are activated in unstable angina patients, with activation persisting for 6-8 weeks.
- Lymphocyte activation in unstable angina is not a direct result of myocardial ischemia.
- These findings support the hypothesis that unstable angina has an immune system-mediated inflammatory basis.