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Engineering stem cell cardiac patch with microvascular features representative of native myocardium.

Zichen Qian1, Dhavan Sharma1, Wenkai Jia1

  • 1Department of Biomedical Engineering, Michigan Technological University, Houghton, MI 49931, USA.

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Engineered aligned extracellular matrix (ECM) scaffolds guide human mesenchymal stem cell (hMSC) and endothelial cell (EC) co-cultures to form dense, physiologically oriented microvascular networks, crucial for cardiac tissue engineering.

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Extracellular matrix nanofibersprevascularization, vascular density, vascular maturation, vascular orientation

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Cardiovascular Research

Background:

  • The native myocardium features highly aligned tissue and vasculature for optimal function.
  • Current strategies for engineering cardiac tissue lack ideal biomaterials and effective vascularization for clinical applications.
  • Developing oriented, high-density microvessels is essential for cardiovascular therapies.

Purpose of the Study:

  • To create an oriented, dense microvessel network mimicking physiological myocardial microvascular features.
  • To investigate the role of extracellular matrix (ECM) topography in guiding neovascularization.
  • To enhance microvascular network formation using co-cultures of human mesenchymal stem cells (hMSCs) and endothelial cells (ECs).

Main Methods:

  • Utilized highly aligned decellularized human dermal fibroblast sheets as ECM scaffolds.
  • Co-cultured hMSCs and endothelial cells (ECs) on aligned and randomly organized ECM scaffolds.
  • Investigated the influence of topographical features on cell interactions and neovasculature formation.

Main Results:

  • Aligned ECM topography, translated via CD166, significantly enhanced hMSC-EC crosstalk and vascular network formation.
  • Aligned ECM nanofibers promoted superior structure, length, and density of microvascular networks compared to random scaffolds.
  • hMSC-EC co-culture stimulated pro-angiogenic factors and matrix remodeling, achieving native myocardium-like intercapillary distance (20 μm).

Conclusions:

  • Co-culture of hMSCs and ECs on aligned ECM scaffolds generates physiologically oriented and dense microvascular networks.
  • This approach shows significant potential for advancing cardiac tissue engineering.
  • The study highlights the importance of topographical cues in biomaterials for vascular regeneration.