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Neuroimmunologic implications in coronary artery disease
G L Fricchione1, T V Bilfinger, A Hartman
1Brigham and Women's Hospital, Division of Psychiatry, Boston, MA 02115, USA.
Insights
Macrophages play a key role in coronary artery disease (CAD) by processing oxidized low-density lipoprotein (LDL) and influencing nitric oxide (NO) production, suggesting novel neuroimmunologic therapeutic targets.
Area of Science:
- Immunology
- Cardiovascular Medicine
- Pathophysiology
Background:
- Coronary artery disease (CAD) involves complex cellular interactions.
- Hyperlipidemia is a significant risk factor, initiating a cascade of events.
Purpose of the Study:
- To examine the macrophage's role in CAD pathophysiology.
- To explore the interaction between macrophages, endothelial cells, and smooth muscle cells.
Main Methods:
- Review of existing literature on macrophage function in atherosclerosis.
- Analysis of the impact of oxidized low-density lipoprotein (LDL) on vascular function.
- Investigation of neuroimmunologic pathways involving nitric oxide (NO) regulation.
Main Results:
- Macrophages initiate events starting with elevated LDL, contributing to oxidized LDL formation.
- Oxidized LDL promotes atherosclerotic plaque formation and impairs vasodilation.
- Macrophages and endothelial cells regulate NO production via mu-3 morphine receptors, potentially explaining morphine/nitroglycerin efficacy.
Conclusions:
- Macrophages are central to CAD pathogenesis, linking lipid metabolism, inflammation, and vascular dysfunction.
- Neuroimmunologic mechanisms, including NO regulation by morphine receptors, offer potential therapeutic avenues for CAD.
- Further research into the neuroimmunologic basis of atherosclerosis is crucial for improved treatment strategies.
Abstract:
In this review, the role of the macrophage in the pathophysiology of coronary artery disease (CAD) is examined. The central interaction of macrophage, endothelial cell and smooth muscle cell in the context of hyperlipidemia is considered. The macrophage appears to be at the beginning of a chain of events that starts with elevated low density lipoprotein (LDL). Stress, particularly in those with a core hostility, may be associated not only with higher catecholamine levels but also with higher serum lipid levels. These lipids will in turn be processed to oxidized LDL by macrophage and endothelial cells. Oxidized LDL molecules will contribute to atherosclerotic plaquing. A side effect of such plaque formation may be a diminished vasodilatory response to the nitric oxide (NO) produced by macrophages and endothelium. Indeed, paradoxical vasoconstriction occurs in atherosclerosis in response to neurotransmitters such as serotonin and acetylcholine, which under normal circumstances cause vasodilation. There also is evidence that both macrophages and endothelial cells can regulate NO production through a specific mu 3 morphine receptor, an effect that can be blocked by naloxone. The clinical effectiveness of morphine and nitroglycerin in CAD patients may relate to these mechanisms. More research will be needed to elucidate the neuroimmunologic basis for atherosclerosis with prospects for better treatment and management in future.