



@article {2305,
	title = {The effect of the co-immobilization of human osteoprogenitors and endothelial cells within alginate microspheres on mineralization in a bone defect},
	journal = {BiomaterialsBiomaterials},
	volume = {30},
	year = {2009},
	note = {Cited By (since 1996): 38Export Date: 21 November 2012Source: ScopusCODEN: BIMADdoi: 10.1016/j.biomaterials.2009.02.033PubMed ID: 19299013Language of Original Document: EnglishCorrespondence Address: Grellier, M.; INSERM, U577, Universit{\'e} Victor Segalen Bordeaux 2, UMR-S577, F-33076 Bordeaux Cedex, France; email: maritie.grellier@inserm.frChemicals/CAS: alginic acid, 28961-37-7, 29894-36-8, 9005-32-7, 9005-38-3; alkaline phosphatase, 9001-78-9; arginylglycylaspartic acid, 99896-85-2; osteocalcin, 136461-80-8; Alginates; Glucuronic Acid, 576-37-4; Hexuronic Acids; alginic acid, 9005-32-7References: Oreffo, R.O., Triffitt, J.T., Future potentials for using osteogenic stem cells and biomaterials in orthopedics (1999) Bone, 25 (2 SUPPL), pp. 5S-9S;Lubiatowski, P., Kruczynski, J., Gradys, A., Trzeciak, T., Jaroszewski, J., Articular cartilage repair by means of biodegradable scaffolds (2006) Transplant Proc, 38 (1), pp. 320-322; 
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},
	month = {2009///},
	pages = {3271 - 3278},
	abstract = {Bone regeneration seems to be dependant on cell communication between osteogenic and endothelial cells arising from surrounding blood vessels. This study aims to determine whether endothelial cells can regulate the osteogenic potential of osteoprogenitor cells in vitro and in vivo, in a long bone defect, when co-immobilized in alginate microspheres. Alginate is a natural polymer widely used as a biomaterial for cell encapsulation. Human osteoprogenitors (HOP) from bone marrow mesenchymal stem cells were immobilized alone or together with human umbilical vein endothelial cells (HUVEC) inside irradiated, oxidized and RGD-grafted alginate microspheres. Immobilized cells were cultured in dynamic conditions and cell metabolic activity increased during three weeks. The gene expression of alkaline phosphatase and osteocalcin, both specific markers of the osteoblastic phenotype, and mineralization deposits were upregulated in co-immobilized HOPs and HUVECs, comparing to the immobilization of monocultures. VEGF secretion was also increased when HOPs were co-immobilized with HUVECs. Microspheres containing co-cultures were further implanted in a bone defect and bone formation was analysed by μCT and histology at 3 and 6 weeks post-implantation. Mineralization was observed inside and around the implanted microspheres containing the immobilized cells. However, when HOPs were co-immobilized with HUVECs, mineralization significantly increased. These findings demonstrate that co-immobilization of osteogenic and endothelial cells within RGD-grafted alginate microspheres provides a promising strategy for bone tissue engineering. {\textcopyright} 2009 Elsevier Ltd. All rights reserved.},
	keywords = {adult, aged, Alginate, Alginates, alginic acid, alkaline phosphatase, animal tissue, Animals, arginylglycylaspartic acid, article, Bioactivity, Biopolymers, Blood vessel prostheses, Blood Vessels, Bone, Bone and Bones, bone defect, Bone defects, Bone formations, Bone marrow mesenchymal stem cells, bone mineralization, Bone Regeneration, Bone regenerations, bone tissue, Bone tissue engineerings, Calcification, Physiologic, Cell communications, Cell culture, Cell encapsulations, cell function, cell growth, Cell immobilization, Cell membranes, cell metabolism, Cells, Cultured, Co immobilizations, Co-culture, coculture, computer assisted tomography, controlled study, Defects, Dynamic conditions, Endothelial Cells, endothelium cell, gene expression, gene expression regulation, Glucuronic Acid, Grafting (chemical), Hexuronic Acids, histology, human, human cell, Human umbilical vein endothelial cells, Humans, Humulus, immobilized cell, Immobilized cells, in vitro study, in vivo study, In-vitro, In-vivo, irradiation, long bone, Long bones, Mesenchymal stem cell, Metabolic activities, Mice, Mice, Nude, microsphere, Microspheres, Middle Aged, Mineralogy, monoculture, mouse, nonhuman, osteoblast, osteocalcin, Osteogenic, Osteogenic potentials, Osteoprogenitor cells, Osteoprogenitors, Oxidation, Peptides, phenotype, Post implantations, priority journal, Self assembly, Sodium compounds, stem cell transplantation, Stem cells, Tissue engineering, umbilical vein, upregulation, Vascular endothelial growth factor (VEGF), X ray analysis, Young Adult},
	isbn = {01429612 (ISSN)},
	url = {http://www.scopus.com/inward/record.url?eid=2-s2.0-67349213598\&partnerID=40\&md5=0190ab2a91dc0dc3527ffd9f86fabf63},
	author = {Grellier, M. and Granja, P.L. and Fricain, J.-C. and Bidarra, S.J. and Renard, M. and Bareille, R. and Bourget, C. and Am{\'e}d{\'e}e, J. and Barbosa, M.A.}
}
