Hydrogel-based engineered skeletal muscle grafts normalize heart function early after myocardial infarction

Area of Science:

• Regenerative Medicine
• Cardiovascular Research
• Biomaterials Science

Background:

• Congestive heart failure remains a significant clinical challenge.
• Tissue engineering offers a potential therapeutic strategy for cardiac repair.
• The functional impact of differentiated myogenic grafts in heart failure is not well-defined.

Purpose of the Study:

• To engineer a biodegradable skeletal muscle graft (ESMG).
• To investigate the functional recovery of infarcted hearts after epicardial implantation of ESMGs.
• To assess the efficacy of differentiated muscle fibers in improving cardiac function.

Main Methods:

• ESMGs were fabricated using collagen, Matrigel, and rat skeletal muscle cells.
• ESMGs were implanted onto the epicardium of infarcted rat hearts.
• Echocardiography, histology, and immunostaining were used for functional and structural analysis.

Main Results:

• In vitro, ESMGs formed a cohesive 3D structure with differentiated myotubes within 1 week.
• Post-implantation, ESMGs became vascularized and integrated with host tissue.
• Mean fractional shortening significantly increased in the ESMG group compared to pre-implantation and sham groups.

Conclusions:

• Implantation of differentiated skeletal muscle grafts can improve systolic heart function post-myocardial infarction.
• This study demonstrates the potential of engineered muscle tissue for treating heart failure.
• Further research is needed to address challenges related to graft survival and integration.