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Phagocyte activation in coronary artery disease
G Ricevuti1, A Mazzone, I Mazzucchelli
1Department of Internal Medicine, University of Pavia, IRCCS S. Matteo Hospital, Italy.
FEMS Microbiology Immunology
|December 1, 1992
Summary
Granulocytes (PMNs) contribute to heart damage in coronary artery disease (CAD). Their aggregation and CD11b/CD18 expression increase, while superoxide release decreases, particularly during angioplasty.
Area of Science:
- Cardiovascular Research
- Immunology
- Pathophysiology
Background:
- Granulocytes (polymorphonuclear cells, PMNs) are implicated in myocardial ischemia and injury.
- These cells release mediators that contribute to tissue damage.
- Understanding PMN function is crucial in coronary artery disease (CAD).
Purpose of the Study:
- To evaluate granulocyte function in patients with CAD.
- To assess changes in PMN activity during coronary angioplasty (PTCA).
Main Methods:
- Studied 20 patients with CAD, comparing PMN activity in the coronary sinus and aorta.
- Analyzed PMN aggregation, leukotriene C4 release, superoxide production, and CD11b/CD18 integrin expression.
- Assessed superoxide release post-stimulation with phorbol-myristate-acetate (PMA) during PTCA.
Main Results:
- PMN aggregating activity was significantly higher in the coronary sinus than the aorta (P < 0.01).
- Smokers showed lower leukotriene C4 release (P < 0.025).
- PMN superoxide production decreased more in the coronary sinus than aorta during PTCA (P < 0.05).
- CD11b/CD18 integrin expression was significantly increased in CAD patients compared to controls (P < 0.01) and correlated with aggregation (r = 0.87, P < 0.001).
Conclusions:
- Granulocytes play a significant role in the pathophysiology of myocardial ischemia in CAD.
- Increased PMN aggregation and CD11b/CD18 expression, coupled with altered superoxide release, highlight their involvement.
- These findings underscore the potential of targeting granulocyte function in managing CAD.