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In order to maintain tissue organization, many animal cells are surrounded by structural molecules that make up the extracellular matrix (ECM). Together, the molecules in the ECM maintain the structural integrity of tissue as well as the remarkable specific properties of certain tissues.
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In animal cells, the extracellular matrix allows cells within tissues to withstand external stresses and transmits signals from the outside of the cell to the inside. The extracellular matrix is extensive, and its composition varies between different types of tissues. For example, the reticular fibers and ground substance make up the ECM in loose connective tissue, while collagen and bone minerals make up the ECM of bone tissue. 
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The extracellular matrix or ECM holds cells together to form a tissue and allows the cells within the tissue to communicate. ECM comprises proteins such as fibronectin, collagen, laminin, etc. The most abundant protein in this space is collagen. Collagen fibers are interwoven with carbohydrate-containing protein molecules called proteoglycans. ECM allows cell migration and provides a structural scaffold at cell adhesion that anchors the cell when the extracellular matrix proteins interact with...
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Unlike epithelial tissue, which is composed of cells closely packed with little or no extracellular space in between, connective tissue cells are dispersed in a matrix. This extracellular matrix (ECM) is composed of fibrous proteins like collagen, elastin, and fibronectin in a ground substance consisting of interstitial fluid, cell adhesion proteins, and proteoglycans. The proteoglycans form a gel-like material in the spaces between cells and provide hydration, buffering, binding, and force...
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Processing of Human Cardiac Tissue Toward Extracellular Matrix Self-assembling Hydrogel for In Vitro and In Vivo Applications
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Infusible Extracellular Matrix Biomaterial Enhances Cell-Specific Pro-Repair Responses Following Acute Myocardial

Joshua M Mesfin1, Alexander Chen2, Quincy P Lyons1

  • 1Shu Chien-Gene Lay Department of Bioengineering, Sanford Consortium for Regenerative Medicine, Sanford Stem Cell Institute, University of California San Diego, La Jolla, California 92037, United States.

Biorxiv : the Preprint Server for Biology
|November 26, 2025
PubMed
Summary
This summary is machine-generated.

This study reveals how intravascularly infusible extracellular matrix (iECM) promotes heart repair after myocardial infarction. Single nucleus RNA sequencing identified key cellular mechanisms, including macrophage activation and improved vascularization, supporting iECM as a promising therapy.

Keywords:
biomaterialdecellularized extracellular matrixinfusiblemyocardial infarctionsnRNAseqtherapeutic

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Area of Science:

  • Regenerative Medicine
  • Biomaterials Science
  • Cardiovascular Research

Background:

  • Myocardial infarction (MI) causes significant pathological effects.
  • Decellularized extracellular matrix (ECM) biomaterials show promise for cardiac repair.
  • The precise cellular and molecular mechanisms of ECM-based therapies remain largely unknown.

Purpose of the Study:

  • To investigate the pro-reparative effects of intravascularly infusible ECM (iECM) biomaterials.
  • To elucidate the cellular and molecular mechanisms underlying iECM-mediated cardiac repair.
  • To define the impact of iECM on various cardiac cell types post-MI.

Main Methods:

  • Development and infusion of pro-reparative decellularized ECM biomaterials (iECM).
  • Application of single nucleus RNA sequencing (snRNAseq) to analyze cardiac cells at acute timepoints (1, 3, 7 days post-infusion).
  • Validation of findings using spatial transcriptomics.

Main Results:

  • iECM treatment promoted pro-reparative macrophage activation and fibroblast remodeling.
  • Significant increases in vascular development and lymphangiogenesis were observed.
  • Evidence of cardioprotection and neurogenesis was identified in response to iECM.
  • snRNAseq and spatial transcriptomics provided detailed cellular and molecular insights.

Conclusions:

  • Decellularized ECM biomaterials, specifically iECM, exhibit significant pro-reparative properties in the cardiac environment.
  • This study defines previously undiscovered therapeutic pathways mediated by iECM.
  • iECM demonstrates substantial potential as a novel therapy for myocardial infarction.