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2016 ; 22
(7
): 663-70
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In Vitro Endothelialization of Biodegradable Vascular Grafts Via Endothelial
Progenitor Cell Seeding and Maturation in a Tubular Perfusion System Bioreactor
#MMPMID27206552
Melchiorri AJ
; Bracaglia LG
; Kimerer LK
; Hibino N
; Fisher JP
Tissue Eng Part C Methods
2016[Jul]; 22
(7
): 663-70
PMID27206552
show ga
A critical challenge to the success of biodegradable vascular grafts is the
establishment of a healthy endothelium. To establish this monolayer of
endothelial cells (ECs), a variety of techniques have been developed, including
cell seeding. Vascular grafts may be seeded with relevant cell types and allowed
to mature before implantation. Due to the low proliferative ability of adult ECs
and issues with donor site morbidity, there has been increasing interest in using
endothelial progenitor cells (EPCs) for vascular healing procedures. In this
work, we combined the proliferative and differentiation capabilities of a
commercial cell line of early EPCs with an established bioreactor system to
support the maturation of cell-seeded vascular grafts. All components of the
vascular graft and bioreactor setup are commercially available and allow for
complete customization of the scaffold and culturing system. This bioreactor
setup enables the control of flow through the graft, imparting fluid shear stress
on EPCs and affecting cellular proliferation and differentiation. Grafts cultured
with EPCs in the bioreactor system demonstrated greatly increased cell
populations and neotissue formation compared with grafts seeded and cultured in a
static system. Increased expression of markers for mature endothelial tissues
were also observed in bioreactor-cultured EPC-seeded grafts. These findings
suggest the distinct advantages of a customizable bioreactor setup for the
proliferation and maturation of EPCs. Such a strategy may be beneficial for
utilizing EPCs in vascular tissue engineering applications.