Hyaluronan-Binding Protein Promotes Fibroblast Transformation and Heart Failure by Modulating the STAT5A-MMP13...

Area of Science:

• Cardiovascular Biology
• Molecular Mechanisms of Disease
• Fibrosis Research

Background:

• Adverse cardiac remodeling is a key driver of heart failure progression.
• The specific role of hyaluronan-binding protein (HYBID) in cardiac remodeling and fibrosis is not well understood.
• Understanding HYBID's function is crucial for developing targeted therapies for heart failure.

Purpose of the Study:

• To investigate the role of HYBID as a profibrotic factor in adverse cardiac remodeling post-myocardial infarction (MI).
• To elucidate the functional impact of HYBID on cardiac fibroblasts and its underlying molecular mechanisms.
• To identify potential therapeutic targets for mitigating heart failure progression.

Main Methods:

• Differential gene expression analysis using RNA sequencing in mouse ventricular tissue post-MI.
• Generation of fibroblast-specific HYBID knockdown and overexpression mouse models.
• In vivo and in vitro histological and biochemical assessments of cardiac remodeling.
• Molecular docking and immunoprecipitation assays to determine molecular interactions.

Main Results:

• HYBID was identified as a fibroblast-enriched gene significantly upregulated in MI mouse hearts.
• Fibroblast-specific HYBID knockdown attenuated cardiac remodeling and improved cardiac function post-MI.
• HYBID overexpression exacerbated fibroblast activation and adverse cardiac remodeling.
• HYBID was found to competitively bind STAT5A, inhibiting MMP13's anti-fibrotic effects and promoting fibroblast activation.

Conclusions:

• HYBID is a novel, fibroblast-enriched regulator that exacerbates fibrosis and adverse cardiac remodeling following MI.
• The HYBID-STAT5A-MMP13 signaling axis is a critical pathway in the progression of heart failure.
• Targeting HYBID presents a potential therapeutic strategy for heart failure treatment.