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Functional small-diameter neovessels created using endothelial progenitor cells expanded ex vivo.

S Kaushal1, G E Amiel, K J Guleserian

  • 1Department of Cardiac Surgery, Children's Hospital, Boston, Massachusetts, USA.

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Summary

Endothelial progenitor cells (EPCs) successfully replaced arterial endothelial cells in tissue-engineered blood vessels, promoting long-term patency and vascular function. This finding supports EPCs for vascular grafts and treating vascular diseases.

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Area of Science:

  • Biomedical Engineering
  • Vascular Biology
  • Regenerative Medicine

Background:

  • Arterial conduits are preferred for bypass surgery due to endothelial cell functions like nitric oxide production.
  • Small-diameter vascular grafts often face patency issues.

Purpose of the Study:

  • To evaluate if endothelial progenitor cells (EPCs) can substitute for arterial endothelial cells in tissue-engineered vascular grafts.
  • To assess the impact of EPCs on the patency and function of small-diameter (4 mm) vascular grafts.

Main Methods:

  • EPCs were isolated from sheep peripheral blood and expanded ex vivo.
  • Decellularized porcine iliac vessels were seeded with EPCs.
  • EPC-seeded and non-seeded grafts were implanted as carotid interposition grafts in sheep.

Main Results:

  • EPC-seeded grafts remained patent for 130 days, while non-seeded grafts occluded within 15 days.
  • Explanted EPC-seeded grafts demonstrated contractile activity and nitric oxide-mediated relaxation comparable to native arteries.

Conclusions:

  • EPCs can functionally replace arterial endothelial cells in tissue-engineered vascular grafts, significantly improving graft survival.
  • EPCs show promise for applications in tissue-engineered structures and the treatment of vascular diseases.