Tissue-engineered arterial grafts: long-term results after implantation in a small animal model

Tamar L. Mirensky, Gregory N. Nelson, Matthew P. Brennan, Jason D. Roh, Narutoshi Hibino, Tai Yi, Toshiharu Shinoka, Christopher K. Breuer

Research output: Contribution to journalArticlepeer-review

Abstract

Background: Use of prosthetic vascular grafts in pediatric vascular surgical applications is limited because of risk of infection, poor durability, potential for thromboembolic complications, and lack of growth potential. Construction of an autologous neovessel using tissue engineering technology offers the potential to create an improved vascular conduit for use in pediatric vascular applications. Methods: Tissue-engineered vascular grafts were assembled from biodegradable tubular scaffolds fabricated from poly-l-lactic acid mesh coated with e{open}-caprolactone and l-lactide copolymer. Thirteen scaffolds were seeded with human aortic endothelial and smooth muscle cells and implanted as infrarenal aortic interposition grafts in SCID/bg mice. Grafts were analyzed at time-points ranging from 4 days to 1 year after implantation. Results: All grafts remained patent without evidence of thromboembolic complications, graft stenosis, or graft rupture as documented by serial ultrasound and computed tomographic angiogram, and confirmed histologically. All grafts demonstrated extensive remodeling leading to the development of well-circumscribed neovessels with an endothelial inner lining, neomedia containing smooth muscle cells and elastin, and a collagen-rich extracellular matrix. Conclusions: The development of second-generation tissue-engineered vascular grafts shows marked improvement over previous grafts and confirms feasibility of using tissue engineering technology to create an improved arterial conduit for use in pediatric vascular surgical applications.

Original languageEnglish (US)
Pages (from-to)1127-1133
Number of pages7
JournalJournal of Pediatric Surgery
Volume44
Issue number6
DOIs
StatePublished - Jun 2009
Externally publishedYes

Keywords

  • Cardiothoracic surgery
  • Congenital heart defect
  • Tissue engineering
  • Vascular conduit
  • Vascular graft

ASJC Scopus subject areas

  • Surgery
  • Pediatrics, Perinatology, and Child Health

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