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Osteoblastic differentiation and potent osteogenicity of three-dimensional hBMSC-BCP particle constructs.
MedLine Citation:
PMID:  22689391     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Bone tissue engineering usually consists of associating osteoprogenitor cells and macroporous scaffolds. This study investigated the in vitro osteoblastic differentiation and resulting in vivo bone formation induced by a different approach that uses particles as substrate for human bone marrow stromal cells (hBMSCs), in order to provide cells with a higher degree of freedom and allow them to synthesize a three-dimensional (3D) environment. Biphasic calcium phosphate (BCP) particles (35 mg, ~175 µm in diameter) were therefore associated with 4 × 10(5) hBMSCs. To discriminate the roles of BCP properties and cell-synthesized 3D environments, inert glass beads (GBs) of similar size were used under the same conditions. In both cases, high cell proliferation and extensive extracellular matrix (ECM) production resulted in the rapid formation of thick cell-synthesized 3D constructs. In vitro, spontaneous osteoblastic differentiation was observed in the 3D constructs at the mRNA and protein levels by monitoring the expression of Runx2, BMP2, ColI, BSP and OCN. The hBMSC-BCP particle constructs implanted in the subcutis of nude mice induced abundant ectopic bone formation after 8 weeks (~35%, n = 5/5). In comparison, only fibrous tissue without bone was observed in the implanted hBMSC-GB constructs (n = 0/5). Furthermore, little bone formation (~3%, n = 5/5) was found in hBMSC-macroporous BCP discs (diameter 8 × 3 mm). This study underlines the lack of correspondence between bone formation and in vitro differentiation assays. Furthermore, these results highlight the importance of using BCP as well as a 3D environment for achieving high bone yield of interest for bone engineering. Copyright © 2012 John Wiley & Sons, Ltd.
Authors:
Thomas Cordonnier; Alain Langonné; Pierre Corre; Audrey Renaud; Luc Sensebé; Philippe Rosset; Pierre Layrolle; Jérôme Sohier
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-6-11
Journal Detail:
Title:  Journal of tissue engineering and regenerative medicine     Volume:  -     ISSN:  1932-7005     ISO Abbreviation:  -     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-6-12     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101308490     Medline TA:  J Tissue Eng Regen Med     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Copyright Information:
Copyright © 2012 John Wiley & Sons, Ltd.
Affiliation:
Inserm U957, Laboratory for Bone Resorption Physiopathology and Primary Bone Tumour Therapy, Faculty of Medicine, University of Nantes, France; EA3855, Laboratory of Haematopoiesis, University François Rabelais, Tours, France.
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