Decellularized myocardial patch functionalized with stem cell-derived exosomes improves cardiac healing after...

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Cardiovascular Research

Background:

• Acute myocardial infarction (AMI) causes irreversible heart damage and limited regenerative therapies.
• Cell-based patches face challenges like poor survival and immune issues.
• Acellular ECM scaffolds lack sufficient biological activity for robust repair.

Purpose of the Study:

• To develop and evaluate a novel exosome-loaded acellular myocardial patch (EXO-AMP) for myocardial repair.
• To combine the structural benefits of decellularized myocardium with the therapeutic potential of exosomes.
• To assess the efficacy of EXO-AMPs in an acute myocardial infarction rat model.

Main Methods:

• Decellularization of rat myocardium using Triton X-100 and SDS to create acellular myocardial patches (AMPs).
• Loading human endometrial mesenchymal stem cell-derived exosomes (hEnMSC-EXOs) within a fibrin hydrogel onto AMPs to form EXO-AMPs.
• Implantation of EXO-AMPs in a rat AMI model and evaluation of cardiac function and histology over 30 days.

Main Results:

• EXO-AMPs demonstrated preserved ultrastructure, low residual DNA, and good cytocompatibility.
• Treatment with EXO-AMPs significantly improved cardiac function (higher LVEF, reduced LV dilation) compared to controls.
• Histology showed thicker infarct walls, reduced fibrosis, increased viable myocardium, and enhanced angiogenesis (elevated CD31).

Conclusions:

• EXO-AMPs provide synergistic mechanical reinforcement and sustained paracrine signaling for myocardial repair.
• This novel biomaterial creates a pro-regenerative microenvironment, attenuating post-infarction remodeling.
• EXO-AMPs represent a promising platform for myocardial regeneration with strong translational potential.