Myocardial Matrix Metalloproteinase 3 Protein Expression in Ischemic Heart Failure

Area of Science:

• Cardiovascular Biology
• Molecular Cardiology
• Biochemistry

Background:

• Matrix metalloproteinase 3 (MMP3) is implicated in myocardial remodeling and heart failure (HF) pathogenesis.
• Limited data exists on MMP3 protein expression in human myocardium during HF progression.

Purpose of the Study:

• To quantify MMP3 protein expression in left ventricular myocardial cells across different stages of ischemic heart failure.
• To investigate the association between MMP3 levels, left ventricular mass, and genetic variations.

Main Methods:

• Quantitative and semi-quantitative immunohistochemical analysis of 113 left ventricular myocardial samples.
• Digital myocardial image analysis to assess MMP3 immunostaining intensity in cardiomyocytes and non-cardiomyocytes.
• Genotyping for MMP3 5A/6A polymorphism.

Main Results:

• MMP3 protein expression significantly increased from control to stage A, B, and C/D ischemic HF (p < 0.001).
• Elevated MMP3 immunostaining in both cell types correlated with increased left ventricular mass.
• The 5A allele and 5A homozygous genotype were associated with higher MMP3 expression.

Conclusions:

• MMP3 protein expression progressively increases in the human left ventricle during ischemic heart failure.
• MMP3 upregulation is linked to left ventricular myocardial remodeling and is influenced by MMP3 gene polymorphism.