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Characterization and osteogenic effects of mesenchymal stem cells on microbeads composed of hydroxyapatite nanoparticles/reconstituted collagen
Author(s) -
Jeng LongBin,
Chung HuiYing,
Lin TsungMin,
Chen JyhPing,
Chen YiLing,
Lu YiLung,
Wang YngJiin,
Chang Sophia ChiaNing
Publication year - 2008
Publication title -
journal of biomedical materials research part a
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.849
H-Index - 150
eISSN - 1552-4965
pISSN - 1549-3296
DOI - 10.1002/jbm.a.32293
Subject(s) - mesenchymal stem cell , materials science , cd90 , alkaline phosphatase , confocal microscopy , flow cytometry , biomedical engineering , matrix (chemical analysis) , cd44 , microbiology and biotechnology , cell , chemistry , biology , composite material , biochemistry , medicine , enzyme
Natural bone is comprised of nanosized blade‐like crystals of hydroxyapatite grown in close contact with collagen (Col) fibers. Characteristics of artificial bone tissue differ considerably with those of natural ones, mainly from the unusual self‐organizing interaction between the apatite crystals and the proteic components. Nanoparticle spheres of hydroxyapatite (n‐HA), dispersed in reconstituted fibrous Col, were prepared in three weight ratios of 75:25, 65:35, and 50:50 (n‐HA:Col). Bone marrow mesenchymal stem cells (MSCs) from rabbits were seeded and cultured on the n‐HA/Col microbeads and characterized. n‐HA were evenly distributed throughout the Col matrix and aggregated to microbeads as determined by scanning electron microscopy. Electron and confocal microscopy showed that the MSCs spread and attached to microbeads via focal adhesions, while staining for F‐actin and DNA revealed the presence of stress fibers. The phenotype of the MSCs in the flow cytometry was identified as CD11a−, CD44+, and CD90.1+. The optimal weight ratio is 65:35 for the normalized alkaline phosphatase activities. The transduced MSCs, engineered by replication‐defective adenovirus to express the BMP‐2 gene, demonstrated synergic osteogenic effects in the microbeads. MSCs are capable of proliferating and differentiating in appropriate combinations of n‐HA/Col. Thus it is a promising composite for future clinical applications. © 2008 Wiley Periodicals, Inc. J Biomed Mater Res, 2009