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Related Experiment Video

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On-Chip Endothelial Inflammatory Phenotyping
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Substrate Topography Modulate Human Vascular Smooth Muscle Cell Proliferation and Phenotype in Proinflammatory

Dency David1, Aung Moe Zaw1, Joshua Kunihiro1

  • 1Department of Chemical Engineering, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada.

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|August 11, 2025
PubMed
Summary
This summary is machine-generated.

Optimizing synthetic vascular graft surfaces with specific micropatterns, like 2 μm gratings, can reduce vascular smooth muscle cell proliferation and intimal hyperplasia, improving graft patency.

Keywords:
Cellular responsesCytoskeletal contractilityMechanobiologyMicrotopographyProinflammatory PDGFSmooth muscle cell phenotype switchSynthetic vascular graft

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Area of Science:

  • Biomaterials Science
  • Vascular Biology
  • Regenerative Medicine

Background:

  • Small-diameter vascular grafts (sSDVG) often fail due to thrombosis and intimal hyperplasia (IH).
  • Dysregulated vascular smooth muscle cell (VSMC) behavior post-injury contributes to graft occlusion.
  • Understanding VSMC response to surface topography under inflammatory conditions is crucial for improving sSDVG patency.

Purpose of the Study:

  • To investigate how substrate topography influences VSMC behavior, including proliferation and phenotype, under pro-inflammatory conditions.
  • To evaluate the efficacy of specific micropatterns in modulating VSMC responses and preventing IH in sSDVG.

Main Methods:

  • Screening of 16 micropatterns on polydimethylsiloxane to identify patterns affecting VSMC proliferation and phenotype.
  • Analysis of VSMC proliferation, phenotype switching (desmin-vimentin), and α-smooth muscle actin (α-SMA) expression.
  • In vivo study in a rabbit carotid artery model using 2 μm grating modified grafts and assessment of IH.

Main Results:

  • A 2 μm grating significantly reduced VSMC proliferation and enhanced contractile phenotype expression.
  • The 2 μm grating suppressed PDGF-induced proliferation and enhanced VSMC motility in PVA hydrogels.
  • In vivo studies showed no increased IH with 2 μm grating grafts compared to controls; mechanistic studies revealed topographical modulation of focal adhesion signaling.

Conclusions:

  • Substrate topography can effectively modulate VSMC behavior, reducing proliferation and promoting a contractile phenotype, even under pro-inflammatory stimulation.
  • The 2 μm grating represents a promising topographical strategy for improving sSDVG design and long-term patency.
  • Topographical control of VSMC responses offers a novel approach to enhance the clinical efficacy of synthetic vascular grafts.