Foam cell

Foam cells are a type of macrophage that have ingested lipids, leading to a foamy appearance under the microscope. They are most commonly associated with atherosclerosis, but can also be found in other conditions.

Formation

Foam cells are formed when macrophages take up low-density lipoprotein (LDL) particles that have become oxidized. The LDL particles are recognized by scavenger receptors on the macrophage, which engulf the particles and store the lipids internally in lipid droplets. Over time, the accumulation of these droplets gives the cell a foamy appearance, hence the name 'foam cell'.

Role in Atherosclerosis

Foam cells play a key role in the development of atherosclerosis. They accumulate in the artery wall, leading to the formation of fatty streaks. These streaks can eventually develop into atherosclerotic plaques, which can cause heart disease and stroke.

Other Conditions

In addition to atherosclerosis, foam cells can also be found in other conditions. For example, they are seen in xanthomas, which are fatty deposits under the skin. They can also be found in certain types of tumors, and in some inflammatory conditions.

Treatment

The formation of foam cells is a key target for the treatment of atherosclerosis. Drugs such as statins can help to reduce the formation of foam cells by lowering the levels of LDL cholesterol in the blood. Other treatments aim to enhance the removal of cholesterol from foam cells, a process known as cholesterol efflux.

See Also

• Macrophage
• Atherosclerosis
• Lipid
• Low-density lipoprotein
• Scavenger receptor
• Lipid droplet
• Heart disease
• Stroke
• Xanthoma
• Tumor
• Inflammation
• Statins
• Cholesterol efflux