Metalloproteinases and vulnerable atherosclerotic plaques

Area of Science:

• Cardiovascular Biology
• Biochemistry
• Pathology

Background:

• Plaque rupture is a primary cause of myocardial infarctions and strokes.
• Ruptured plaques are characterized by thin, inflamed, and collagen-poor fibrous caps.
• Elevated levels of proteases, such as matrix metalloproteinases (MMPs), are found in weakened plaque caps.

Purpose of the Study:

• To investigate the dual role of matrix metalloproteinases (MMPs) in plaque stability and rupture.
• To explore therapeutic strategies targeting MMPs in cardiovascular disease.

Main Methods:

• Analysis of plaque composition and protease levels.
• Assessment of MMPs' effects on fibrous cap integrity.
• Evaluation of vascular smooth muscle cell migration and proliferation.

Main Results:

• MMPs can weaken fibrous caps by degrading extracellular matrix components.
• MMPs also promote vascular smooth muscle cell migration and proliferation, potentially stabilizing caps.
• The net effect of MMPs on plaque stability is complex and context-dependent.

Conclusions:

• Matrix metalloproteinases (MMPs) play a dual role in atherosclerotic plaque stability, potentially contributing to both rupture and stability.
• Therapeutic interventions should selectively target detrimental MMP activity or its causative factors to prevent plaque rupture.
• Further research is needed to elucidate the precise mechanisms and develop targeted therapies.