Infusible Extracellular Matrix Biomaterial Enhances Cell-Specific Pro-Repair Responses Following Acute Myocardial...

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Cardiovascular Research

Background:

• Myocardial infarction (MI) causes significant cardiac damage.
• Decellularized extracellular matrix (ECM) shows promise for cardiac repair.
• The cellular mechanisms of intravascularly infusible ECM (iECM) remain unclear.

Purpose of the Study:

• To investigate the cellular and molecular mechanisms of iECM-mediated cardiac repair.
• To identify pro-reparative responses in different cardiac cell types following iECM infusion.
• To explore novel therapeutic pathways for myocardial infarction using iECM.

Main Methods:

• Single-nucleus RNA sequencing (snRNAseq) was used to analyze cellular responses at acute timepoints (1, 3, and 7 days post-infusion).
• Spatial transcriptomics was employed for validation of key findings.
• Bulk techniques were contrasted with high-resolution single-cell analysis.

Main Results:

• iECM infusion promoted pro-reparative macrophage activation and fibroblast remodeling.
• Significant increases in vascular development and lymphangiogenesis were observed.
• Evidence of cardioprotection and neurogenesis was identified post-iECM treatment.

Conclusions:

• iECM demonstrates a pro-reparative effect across multiple cardiac cell types.
• Novel therapeutic pathways for myocardial infarction have been elucidated.
• This study validates iECM as a promising therapy for MI and showcases next-generation sequencing data.