Injectable self-assembling peptide nanofibers create intramyocardial microenvironments for endothelial cells

Area of Science:

• Biomaterials Science
• Cardiovascular Research
• Regenerative Medicine

Background:

• Enhancing transplanted cell survival and endogenous precursor support is critical.
• Developing injectable myocardial microenvironments to promote vascularization is a key goal.

Purpose of the Study:

• To investigate the potential of self-assembling peptides (SAPs) to form injectable nanofiber microenvironments within the myocardium.
• To assess the ability of these microenvironments to recruit endothelial cells and support vascularization and cell survival.

Main Methods:

• Injected self-assembling peptides into the myocardium to form detectable nanofiber microenvironments.
• Assessed recruitment of endothelial progenitor cells using isolectin and platelet-endothelial cell adhesion molecule-1 (PECAM-1) staining.
• Evaluated recruitment of vascular smooth muscle cells and cardiac cells expressing alpha-sarcomeric actin and Nkx2.5.
• Investigated survival of transplanted cardiomyocytes within the peptide microenvironment.

Main Results:

• Self-assembling peptide nanofibers were successfully formed and detected within the myocardium.
• These microenvironments recruited endothelial progenitor cells and vascular smooth muscle cells, forming vascular structures.
• Cardiac cells and transplanted cardiomyocytes infiltrated and survived within the peptide microenvironment, with enhanced survival observed.

Conclusions:

• Self-assembling peptides can create functional nanofiber microenvironments in the myocardium that promote vascular cell recruitment.
• These injectable peptide nanofibers offer a versatile platform for tissue regeneration strategies.
• The approach shows promise for enhancing cell survival and promoting vascularization in cardiac repair.