Effect of immobilized collagen type IV on biological properties of endothelial cells for the enhanced endothelialization of synthetic vascular graft materials
- Authors
- Heo, Yunhoe; Shin, Young Min; Lee, Yu Bin; Lim, Youn Mook; Shin, Heungsoo
- Issue Date
- Oct-2015
- Publisher
- ELSEVIER
- Keywords
- Electrospinning; Surface modification; Endothelialization; Vascular graft; Collagen type IV
- Citation
- COLLOIDS AND SURFACES B-BIOINTERFACES, v.134, pp.196 - 203
- Indexed
- SCIE
SCOPUS
- Journal Title
- COLLOIDS AND SURFACES B-BIOINTERFACES
- Volume
- 134
- Start Page
- 196
- End Page
- 203
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/156234
- DOI
- 10.1016/j.colsurfb.2015.07.003
- ISSN
- 0927-7765
- Abstract
- Regeneration of healthy endothelium onto vascular graft materials is imperative for prevention of intimal hyperplasia and thrombogenesis. In this study, we investigated the effect of collagen type IV (COL-IV) immobilized onto electrospun nanofibers on modulation of endothelial cell (EC) function, as a potential signal to rapid endothelialization of vascular grafts. COL-IV is assembled in basement membrane underneath intimal layer and regulates morphogenesis of blood vessels. For immobilization of COL-IV, poly(L-lactic acid) (PLLA) nanofibers (PL) were prepared as a model vascular graft substrate, onto which acrylic acid (AAc) was then grafted by using gamma-ray irradiation. AAc graft was dependent on irradiation doses and AAc concentrations, which allowed us to select the condition of 5% (v/v) AAc and 10 kGy for further conjugation of COL-IV. COL-IV immobilization was proportionally controlled as a function of its concentration. Atomic force microscope (AFM) analysis qualitatively supported immobilization of COL-IV, demonstrating increase in root mean square roughness of the PL from 665.37 +/- 13.20 nm to 1440.74 +/- 33.24. However, the Young's modulus of nanofibers was retained as approximately 1 MPa, regardless of surface modification. The number of ECs attached on the nanofibers with immobilized COLIV was significantly increased by 5 times (1052 +/- 138 cells/mm(2)) from pristine PL (2341 +/- 41 cells/mm(2)). In addition, the effect of immobilized COL-IV was profound for enhancing proliferation and up-regulation of markers implicated in rapid endothelialization. Collectively, our results suggest that COL-IV immobilized onto electrospun PLLA nanofibers may serve as a promising instructive cue used in vascular graft materials.
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