Iron in arterial plaque: modifiable risk factor for atherosclerosis

Area of Science:

• Cardiovascular Science
• Iron Metabolism
• Atherosclerosis Research

Background:

• Cardiovascular disease is a leading cause of mortality worldwide.
• Atherosclerotic plaque development is a complex process involving various cellular and molecular factors.
• Iron accumulation within atherosclerotic lesions has been observed, prompting investigation into its role.

Purpose of the Study:

• To explore the protective role of iron depletion against cardiovascular disease.
• To investigate the mechanisms by which iron levels in atherosclerotic plaque influence disease progression.
• To evaluate arterial plaque iron as a potential modifiable risk factor for atherogenesis.

Main Methods:

• Review of existing literature on iron levels in human atherosclerotic lesions and healthy arterial tissue.
• Analysis of findings from animal models demonstrating the effects of iron depletion (phlebotomy, chelation, dietary restriction) on lesion size and stability.
• Examination of associations between cardiovascular disease risk factors, plaque iron concentration, and genetic polymorphisms (haptoglobin, Heme oxygenase 1).

Main Results:

• Human atherosclerotic lesions exhibit significantly higher iron concentrations than healthy arterial tissue.
• In animal models, reducing lesion iron levels led to decreased lesion size and/or increased plaque stability.
• Factors linked to increased cardiovascular disease risk are often associated with elevated plaque iron; genetic factors influencing iron metabolism (haptoglobin, HO1, hepcidin) correlate with cardiovascular outcomes.

Conclusions:

• Arterial plaque iron concentration is elevated in human atherosclerotic lesions.
• Depleting iron within atherosclerotic plaques, through various methods, reduces lesion progression and enhances stability in animal models.
• Arterial plaque iron represents a modifiable risk factor for the development and progression of atherosclerosis.