Plaque stabilization: the role of lipid lowering

Area of Science:

• Cardiovascular Biology
• Atherosclerosis Research
• Biochemistry

Background:

• Unstable atheroma features a thin fibrous cap and large necrotic core, leading to mechanical stress and plaque rupture.
• Biological factors beyond morphology, including matrix-degrading enzymes and inflammatory cells, contribute to fibrous cap fracture.

Purpose of the Study:

• To elucidate the biological factors contributing to the instability and rupture of atherosclerotic plaques.
• To understand the role of matrix-degrading enzymes and cellular signaling in atheroma progression.

Main Methods:

• Analysis of atherosclerotic tissue for plaque morphology, enzyme expression, and cellular infiltration.
• Investigation of cellular mechanisms regulating matrix-degrading enzyme expression in vascular smooth muscle cells.

Main Results:

• Overexpression of matrix-degrading enzymes, particularly metalloproteinases, is observed in unstable atheroma.
• High-stress regions within plaques show increased enzyme levels and inflammatory cell infiltration.
• Mechanical stimuli and cytokines influence enzyme expression by vascular smooth muscle cells.

Conclusions:

• Plaque instability is multifactorial, involving mechanical stress, matrix degradation, inflammation, and cellular signaling.
• Low-density lipoprotein cholesterol plays a significant role in these pathological processes.
• Current understanding supports the efficacy of lipid-lowering therapies for managing unstable atheroma.