Enhancing neovascularization post-myocardial infarction through injectable hydrogel functionalized with...

Area of Science:

• Regenerative Medicine
• Biomaterials Science
• Cardiovascular Research

Background:

• Cell therapy has faced challenges due to safety concerns and limited efficacy.
• Extracellular vesicles (EVs) offer a promising cell-free alternative for regenerative medicine.
• Previous work demonstrated HUVEC-EVs promote vascularization in engineered tissues.

Purpose of the Study:

• To investigate the therapeutic potential of HUVEC-derived EVs encapsulated in a gelatin methacrylate (GelMA) hydrogel for acute myocardial infarction.
• To assess the impact of this bioactive hydrogel on cardiac tissue repair and vascularization.
• To characterize the molecular cargo of EVs to support their role in regeneration.

Main Methods:

• Development of an injectable GelMA hydrogel functionalized with human umbilical vein endothelial cell (HUVEC)-derived EVs.
• In vivo testing in an acute myocardial infarction animal model.
• Assessment of cardiac function, fibrosis, and angiogenesis.
• miRNome and proteomic analysis of EVs.

Main Results:

• The GelMA-EV hydrogel significantly reduced cardiac fibrosis.
• Improved cardiac contractility and function were observed post-treatment.
• Enhanced angiogenesis and restoration of vascular deficits were evident.
• EVs showed a potent neoangiogenic potential, further boosted by stress conditions on parent cells.

Conclusions:

• Injectable GelMA hydrogels functionalized with HUVEC-EVs represent a promising cell-free therapeutic strategy for acute myocardial infarction.
• This approach mitigates risks associated with cell transplantation, including immune rejection and oncogenesis.
• EVs, particularly when derived from stressed cells, hold significant potential as bioactive components for hydrogel-based regenerative therapies.