Chronic inflammation fuels arterial plaque buildup
Atherosclerosis is not simply a problem of fat and cholesterol. Inflammation plays an equally central role. New research examines how that inflammation can be targeted precisely, without broadly suppressing the immune system.
Atherosclerosis, the accumulation of fatty plaques inside artery walls, is one of the leading causes of heart disease and stroke in older adults. A plaque is not a passive deposit. It is an active site of inflammation. The researchers describe how chronic inflammation, which increases with aging, accelerates this process.
Key players are macrophages: immune cells that attempt to remove cholesterol from artery walls by carrying it back into the bloodstream via HDL particles. Inflammatory signals attract macrophages to the plaque while simultaneously impairing their ability to repair damage. As a result, macrophages die more frequently and add their mass to the growing plaque. Additionally, smooth muscle cells in the artery wall change their identity under the same inflammatory signals, adopting macrophage-like behaviour that further worsens the situation.
Why broad anti-inflammatory drugs fall short
Broadly suppressing the immune system is not a viable strategy in atherosclerosis. It increases the risk of infections and other serious side effects. Research therefore focuses on targeted anti-inflammatory strategies that address only the damaging arm of the inflammatory response inside plaques, while leaving protective immune function intact. Several approaches are under investigation, including molecules that block specific inflammatory pathways within macrophages.
Aging as the accelerant
Chronic low-grade inflammation, also called inflammaging, is a hallmark of the aging process. The immune system becomes mildly but persistently activated over the years. This raises the threshold for macrophages to function effectively and makes artery walls more vulnerable to plaque growth. Anti-inflammatory therapies for atherosclerosis therefore target a fundamental mechanism of aging at the same time. That makes this research area relevant from a broader longevity perspective, though the strategies discussed remain largely experimental and clinical evidence is still limited.
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