Please use this identifier to cite or link to this item: https://doi.org/10.1007/s10856-011-4300-0
Title: Hyaluronan-based heparin-incorporated hydrogels for generation of axially vascularized bioartificial bone tissues: In vitro and in vivo evaluation in a PLDLLA-TCP-PCL-composite system
Authors: Rath, S.N.
Pryymachuk, G.
Bleiziffer, O.A.
Lam, C.X.F. 
Arkudas, A.
Ho, S.T.B.
Beier, J.P.
Horch, R.E.
Hutmacher, D.W.
Kneser, U.
Issue Date: May-2011
Source: Rath, S.N., Pryymachuk, G., Bleiziffer, O.A., Lam, C.X.F., Arkudas, A., Ho, S.T.B., Beier, J.P., Horch, R.E., Hutmacher, D.W., Kneser, U. (2011-05). Hyaluronan-based heparin-incorporated hydrogels for generation of axially vascularized bioartificial bone tissues: In vitro and in vivo evaluation in a PLDLLA-TCP-PCL-composite system. Journal of Materials Science: Materials in Medicine 22 (5) : 1279-1291. ScholarBank@NUS Repository. https://doi.org/10.1007/s10856-011-4300-0
Abstract: Smart matrices are required in bone tissueengineered grafts that provide an optimal environment for cells and retain osteo-inductive factors for sustained biological activity. We hypothesized that a slow-degrading heparin-incorporated hyaluronan (HA) hydrogel can preserve BMP-2; while an arterio-venous (A-V) loop can support axial vascularization to provide nutrition for a bioartificial bone graft. HA was evaluated for osteoblast growth and BMP-2 release. Porous PLDLLA-TCP-PCL scaffolds were produced by rapid prototyping technology and applied in vivo along with HA-hydrogel, loaded with either primary osteoblasts or BMP-2. A microsurgically created A-V loop was placed around the scaffold, encased in an isolation chamber in Lewis rats. HA-hydrogel supported growth of osteoblasts over 8 weeks and allowed sustained release of BMP-2 over 35 days. The A-V loop provided an angiogenic stimulus with the formation of vascularized tissue in the scaffolds. Bone-specific genes were detected by real time RT-PCR after 8 weeks. However, no significant amount of bone was observed histologically. The heterotopic isolation chamber in combination with absent biomechanical stimulation might explain the insufficient bone formation despite adequate expression of bone-related genes. Optimization of the interplay of osteogenic cells and osteo-inductive factors might eventually generate sufficient amounts of axially vascularized bone grafts for reconstructive surgery. © Springer Science+Business Media, LLC 2011.
Source Title: Journal of Materials Science: Materials in Medicine
URI: http://scholarbank.nus.edu.sg/handle/10635/67090
ISSN: 09574530
DOI: 10.1007/s10856-011-4300-0
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