S100B expression modulates left ventricular remodeling after myocardial infarction in mice

Area of Science:

• Cardiovascular Biology
• Molecular Cardiology
• Cardiac Remodeling

Background:

• S100B is a calcium-binding protein that acts as a negative regulator of myocardial hypertrophy.
• Its role in cardiac remodeling post-myocardial infarction (MI) requires further investigation.

Purpose of the Study:

• To investigate the role of S100B in regulating cardiac hypertrophy and remodeling after MI.
• To assess the functional consequences of S100B overexpression and deficiency in a mouse model of MI.

Main Methods:

• Generated S100B-overexpressing transgenic (TG) and S100B-knockout (KO) mice.
• Induced experimental myocardial infarction (MI) and compared outcomes with wild-type (WT) and sham-operated controls over 35 days.
• Utilized echocardiography, hemodynamic studies, and postmortem examinations to assess cardiac function and structure.

Main Results:

• KO mice exhibited augmented hypertrophy and improved cardiac function compared to WT mice post-MI.
• TG mice showed no hypertrophy but increased apoptosis and impaired cardiac function.
• Abrogation of S100B expression was beneficial for preserving cardiac function within the observed timeframe.

Conclusions:

• S100B plays a critical role in regulating hypertrophic response and cardiac remodeling in the early post-MI period.
• Modulating S100B activity presents a potential novel therapeutic strategy for post-infarction cardiac dysfunction.