Matrix metalloproteinases: implication in vascular matrix remodelling during atherogenesis

Area of Science:

• Biochemistry
• Genetics
• Cardiovascular Medicine

Background:

• Matrix metalloproteinases (MMPs) are enzymes involved in extracellular matrix remodeling.
• Atherosclerosis pathogenesis involves vascular matrix remodeling, with some MMPs implicated.
• A common genetic variant in the stromelysin gene promoter exists with 5A and 6A alleles.

Purpose of the Study:

• To investigate the functional consequences of the stromelysin gene promoter variant.
• To determine the association between the stromelysin gene promoter variant and coronary artery disease progression.

Main Methods:

• Functional analysis of stromelysin promoter activity for 5A and 6A alleles.
• Quantitative angiography to assess atherosclerosis progression in patients with coronary artery disease.

Main Results:

• The 6A allele exhibits lower promoter activity than the 5A allele due to repressor protein binding.
• The 6A allele is associated with accelerated atherosclerosis progression in patients with coronary artery disease.
• Lower stromelysin expression in 6A6A genotype individuals may favor matrix deposition.

Conclusions:

• Matrix metalloproteinases may contribute to plaque rupture in specific atherosclerotic areas.
• Imbalance favoring matrix deposition is characteristic of atheromas.
• Individuals with the 6A6A genotype may experience exacerbated matrix deposition due to reduced stromelysin expression.