期刊
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH PART A
卷 104, 期 1, 页码 165-177出版社
WILEY-BLACKWELL
DOI: 10.1002/jbm.a.35552
关键词
nucleus pulposus; tissue engineering; hydrogel; mesenchymal stem cells; carboxymethylcellulose
资金
- National Science Foundation [DMR 1207480]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1207480] Funding Source: National Science Foundation
Engineered constructs represent a promising treatment for replacement of nucleus pulposus (NP) tissue. Recently, photocrosslinked hydrogels comprised of methacrylated carboxymethylcellulose (CMC) were shown to support chondrogenic differentiation of encapsulated human mesenchymal stem cells (hMSCs) and promote accumulation of NP-like extracellular matrix (ECM). The objective of this study was to investigate the influence of CMC crosslinking density, by varying macromer concentration and modification (i.e., methacrylation) percentage, on NP-like differentiation of encapsulated hMSCs. Constructs of lower macromer concentration (2%, w/v) exhibited significantly greater collagen II accumulation, more homogeneous distribution of ECM macromolecules, and a temporal increase in mechanical properties compared to hydrogels of higher macromer concentration (4%, w/v). Constructs of higher modification percentage (25%) gave rise to significantly elevated collagen II content and the formation of cell clusters within the matrix relative to samples of lower modification percentage (10% and 15%). These differences in functional ECM accumulation and distribution are likely attributed to the distinct crosslinked network structures of the various hydrogel formulations. Overall, CMC constructs of lower macromer concentration and modification percentage were most promising as scaffolds for NP tissue engineering based on functional ECM assembly. Optimization of such hydrogel fabrication parameters may lead to the development of clinically relevant tissue-engineered NP replacements. (c) 2015 Wiley Periodicals, Inc.
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