Mechanism of calcification in atherosclerosis

Area of Science:

• Cardiovascular Biology
• Bone Biology
• Cellular Differentiation

Background:

• Arterial calcification is a hallmark of atherosclerosis with significant clinical implications.
• The mineral component of arterial calcification is hydroxyapatite, identical to bone mineral.
• Bone-related proteins and osteogenic factors are present in atherosclerotic lesions.

Purpose of the Study:

• To investigate the potential osteogenic mechanism of arterial calcification.
• To identify the cellular source of mineral formation in the arterial wall.
• To explore the link between atherosclerotic plaque and osteogenic differentiation.

Main Methods:

• Analysis of bone-related proteins in atherosclerotic lesions.
• Detection of bone morphogenetic protein 2a expression in calcified plaques.
• Isolation and characterization of mineral-forming cells from aorta using immunostaining.

Main Results:

• Bone morphogenetic protein 2a is expressed in human atherosclerotic lesions.
• A cell with microvascular pericyte markers, capable of mineral formation, was isolated from aorta.
• Findings suggest arterial calcification is initiated by osteogenic differentiation of pericyte-like cells.

Conclusions:

• Arterial calcification may result from atherosclerotic plaque inducing osteogenic differentiation of pericyte-like cells.
• This process involves the production of a bone-like matrix and hydroxyapatite.
• The study raises questions about potential risks of osteoporosis treatments on arterial calcification.