Controllable synthesis of biomimetic nano/submicro-fibrous tubes for potential small-diameter vascular grafts.

Journal of Materials Chemistry. B, Materials for Biology and Medicine
Yizao WanHonglin Luo

Abstract

Mimicking the morphological structure of native blood vessels is critical for the development of vascular grafts. Herein, small-diameter composite vascular grafts that integrate the nanofibrous bacterial cellulose (BC) and submicrofibrous cellulose acetate (CA) were fabricated via a combined electrospinning and step-by-step in situ biosynthesis. Scanning electron microscopy (SEM) observation shows the nano/submicro-fibrous morphology and well-interconnected porous structure of the BC/CA grafts. It is found that the BC/CA graft with a suitable BC content demonstrates lower potential of thrombus formation and enhanced endothelialization as compared to the BC and CA counterparts. Western blotting and RT-qPCR results suggest that the BC/CA-2 graft promotes endothelialization by improving expressions of genes vWF-1 and CD31 and protein CD31. The in vivo tests demonstrate much lower inflammatory response to the BC/CA graft. These results suggest that the BC/CA graft shows a great potential as an artificial graft for rapid formation of an endothelial cell monolayer.

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Methods Mentioned

BETA
X-ray
atomic force microscopy
electrophoresis
PCR
AFM
acetylation

Software Mentioned

Nano Measurer
SPSS
Image J

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