This study is aimed to evaluate the degradation characteristics, cell viability and host tissue responses of PDLLA/PRGD/beta-TCP (PRT) composite nerve scaffold, which was fabricated by poly(D, L-lactic acid) (PDLLA), RGD peptide(Gly-Arg-Gly-Asp-Tyr, GRGDY, abbreviated as RGD) modified poly-{(lactic acid)-co-[(glycolic acid)-alt-(L-lysine)]}(PRGD) and beta-tricalcium phosphate (beta-TCP). The scaffolds' in vitro degradation behaviors were investigated in detail by analysing changes in weight loss, pH and morphology. Then, the 3-(4,5-dimethyl-2-thiazolyl) -2,5-diphenyl-2 -H-tetrazolium bromide (MTT) assay and cell live/dead assay were carried out to assess their cell viability. Moreover, in vivo degradation patterns and host inflammation responses were monitored by subcutaneous implantation of PRT scaffold in rats. Our data showed that, among the tested scaffolds, the PRT scaffold had the best buffering capacity (pH - 6.1-6.3) and fastest degradation rate (12.4%, 8 weeks) during in vitro study, which was contributed by the incorporation of beta-TCP nanoparticles. After in vitro and in vivo degradation, the high porosity structure of PRT could be observed using scanning electron microscopy. Meanwhile, the PRT scaffold could significantly promote cell survival. In the PRT scaffold implantation region, less inflammatory cells (especially for neutrophil and lymphocyte) could be detected. These results indicated that the PRT composite scaffold had a good biodegradable property; it could improve cells survival and reduced the adverse host tissue inflammation responses.
| Identifer | oai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/622155 |
| Date | 06 1900 |
| Creators | Yi, Jiling, Xiong, Feng, Li, Binbin, Chen, Heping, Yin, Yixia, Dai, Honglian, Li, Shipu |
| Contributors | Univ Arizona, Sch Med |
| Publisher | OXFORD UNIV PRESS |
| Source Sets | University of Arizona |
| Language | English |
| Detected Language | English |
| Type | Article |
| Rights | © The Author(s) 2016. Published by Oxford University Press. This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/4.0/ ). |
| Relation | https://academic.oup.com/rb/article-lookup/doi/10.1093/rb/rbw017 |
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