Bioengineered three-layered robust and elastic artery using hemodynamically-equivalent pulsatile bioreactor.

Kiyotaka Iwasaki, Koji Kojima, Shohta Kodama, Ana C. Paz, Melody Chambers, Mitsuo Umezu, Charles A. Vacanti

Research output: Contribution to journalArticle

92 Citations (Scopus)

Abstract

BACKGROUND: There is an essential demand for tissue engineered autologous small-diameter vascular graft, which can function in arterial high pressure and flow circulation. We investigated the potential to engineer a three-layered robust and elastic artery using a novel hemodynamically-equivalent pulsatile bioreactor. METHODS AND RESULTS: Endothelial cells (ECs), smooth muscle cells (SMCs), and fibroblasts were harvested from bovine aorta. A polyglycolic acid (PGA) sheet and a polycaprolactone sheet seeded with SMCs, and a PGA sheet seeded with fibroblast, were wrapped in turn on a 6-mm diameter silicone tube and incubated in culture medium for 30 days. The supporting tube was removed, and the lumen was seeded with ECs and incubated for another 2 days. The pulsatile bioreactor culture, under regulated gradual increase in flow and pressure from 0.2 (0.5/0) L/min and 20 (40/15) mm Hg to 0.6 (1.4/0.2) L/min and 100 (120/80) mm Hg, was performed for an additional 2 weeks (n=10). The engineered vessels acquired distinctly similar appearance and elasticity as native arteries. Scanning electron microscopic examination and Von Willebrand factor staining demonstrated the presence of ECs spread over the lumen. Elastica Van Gieson and Masson Tricrome Stain revealed ample production of elastin and collagen in the engineered grafts. Alpha-SMA and calponin staining showed the presence of SMCs. Tensile tests demonstrated that engineered vessels acquired equivalent ultimate strength and similar elastic characteristics as native arteries (Ultimate Strength of Native: 882+/-133 kPa, Engineered: 827+/-155 kPa, each n=8). CONCLUSIONS: A robust and elastic small-diameter artery was engineered from three types of vascular cells using the physiological pulsatile bioreactor.

Original languageEnglish
JournalCirculation
Volume118
Issue number14 Suppl
DOIs
Publication statusPublished - 2008 Sep 30
Externally publishedYes

Fingerprint

Bioreactors
Arteries
Polyglycolic Acid
Smooth Muscle Myocytes
Endothelial Cells
Blood Vessels
Fibroblasts
Staining and Labeling
Transplants
Elastin
Rubber
Elasticity
von Willebrand Factor
Silicones
Culture Media
Aorta
Arterial Pressure
Coloring Agents
Collagen
Electrons

ASJC Scopus subject areas

  • Physiology (medical)
  • Cardiology and Cardiovascular Medicine

Cite this

Bioengineered three-layered robust and elastic artery using hemodynamically-equivalent pulsatile bioreactor. / Iwasaki, Kiyotaka; Kojima, Koji; Kodama, Shohta; Paz, Ana C.; Chambers, Melody; Umezu, Mitsuo; Vacanti, Charles A.

In: Circulation, Vol. 118, No. 14 Suppl, 30.09.2008.

Research output: Contribution to journalArticle

Iwasaki, Kiyotaka ; Kojima, Koji ; Kodama, Shohta ; Paz, Ana C. ; Chambers, Melody ; Umezu, Mitsuo ; Vacanti, Charles A. / Bioengineered three-layered robust and elastic artery using hemodynamically-equivalent pulsatile bioreactor. In: Circulation. 2008 ; Vol. 118, No. 14 Suppl.
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AU - Chambers, Melody

AU - Umezu, Mitsuo

AU - Vacanti, Charles A.

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AB - BACKGROUND: There is an essential demand for tissue engineered autologous small-diameter vascular graft, which can function in arterial high pressure and flow circulation. We investigated the potential to engineer a three-layered robust and elastic artery using a novel hemodynamically-equivalent pulsatile bioreactor. METHODS AND RESULTS: Endothelial cells (ECs), smooth muscle cells (SMCs), and fibroblasts were harvested from bovine aorta. A polyglycolic acid (PGA) sheet and a polycaprolactone sheet seeded with SMCs, and a PGA sheet seeded with fibroblast, were wrapped in turn on a 6-mm diameter silicone tube and incubated in culture medium for 30 days. The supporting tube was removed, and the lumen was seeded with ECs and incubated for another 2 days. The pulsatile bioreactor culture, under regulated gradual increase in flow and pressure from 0.2 (0.5/0) L/min and 20 (40/15) mm Hg to 0.6 (1.4/0.2) L/min and 100 (120/80) mm Hg, was performed for an additional 2 weeks (n=10). The engineered vessels acquired distinctly similar appearance and elasticity as native arteries. Scanning electron microscopic examination and Von Willebrand factor staining demonstrated the presence of ECs spread over the lumen. Elastica Van Gieson and Masson Tricrome Stain revealed ample production of elastin and collagen in the engineered grafts. Alpha-SMA and calponin staining showed the presence of SMCs. Tensile tests demonstrated that engineered vessels acquired equivalent ultimate strength and similar elastic characteristics as native arteries (Ultimate Strength of Native: 882+/-133 kPa, Engineered: 827+/-155 kPa, each n=8). CONCLUSIONS: A robust and elastic small-diameter artery was engineered from three types of vascular cells using the physiological pulsatile bioreactor.

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