MicroRNA-150 Deletion from Adult Myofibroblasts Augments Maladaptive Cardiac Remodeling Following Chronic Myocardial...

Area of Science:

• Cardiovascular Biology
• Molecular Cardiology
• MicroRNA Therapeutics

Background:

• MicroRNA-150 (miR-150) is downregulated in heart failure (HF) and correlates with patient outcomes.
• Previous studies showed systemic miR-150 protects the heart by inhibiting cardiomyocyte death and fibroblast activation.
• The specific role of miR-150 in cardiac myofibroblasts post-myocardial infarction (MI) was unclear.

Purpose of the Study:

• To investigate the functional role of miR-150 in adult cardiac myofibroblasts (MFs) following MI.
• To determine if MF-specific miR-150 deletion impacts cardiac dysfunction and post-MI remodeling.

Main Methods:

• Development of a novel 4-hydroxytamoxifen-inducible MF-specific miR-150 conditional knockout mouse model.
• Induction of MI in knockout mice to assess cardiac function and tissue response.
• Analysis of cardiac damage, apoptosis, gene expression (proinflammatory and profibrotic), and fibrosis.

Main Results:

• MF-specific miR-150 knockout mice exhibited worse cardiac dysfunction after MI.
• Deletion of miR-150 in adult MFs exacerbated cardiac damage and apoptosis following chronic MI.
• MF-specific miR-150 deficiency promoted proinflammatory and profibrotic gene expression and cardiac fibrosis post-MI.

Conclusions:

• Myofibroblast-derived miR-150 plays a key protective role in modulating the cardiac response to MI.
• Targeting miR-150 in MFs may represent a novel therapeutic strategy for post-MI recovery.