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Guimarães, Portugal

De Paula A.C.C.,Federal University of Minas Gerais | Zonari A.A.C.,Federal University of Minas Gerais | Martins T.M.D.M.,Federal University of Minas Gerais | Novikoff S.,Federal University of Minas Gerais | And 7 more authors.
Tissue Engineering - Part A | Year: 2013

Human adipose-derived stem cells (hASCs) are currently a point of focus for bone tissue engineering applications. However, the ex vivo expansion of stem cells before clinical application remains a challenge. Fetal bovine serum (FBS) is largely used as a medium supplement and exposes the recipient to infections and immunological reactions. In this study, we evaluated the osteogenic differentiation process of hASCs in poly-3-hydroxybutyrate-co-3-hydroxyvalerate (PHB-HV) scaffolds with the osteogenic medium supplemented with pooled allogeneic human serum (aHS). The hASCs grown in the presence of FBS or aHS did not show remarkable differences in morphology or immunophenotype. The PHB-HV scaffolds, which were developed by the freeze-drying technique, showed an adequate porous structure and mechanical performance as observed by micro-computed tomography, scanning electron microscopy (SEM), and compression test. The three-dimensional structure was suitable for allowing cell colonization, which was revealed by SEM micrographs. Moreover, these scaffolds were not toxic to cells as shown by 3-(4,5-dimethylthiazol-2-yl)-2,5- diphenyltetrazolium bromide assay. The differentiation capacity of hASCs seeded on scaffolds was confirmed by the reduction of the proliferation, the alkaline phosphatase (AP) activity, expression of osteogenic gene markers (AP, collagen type I, Runx2, and osteocalcin), and the expression of bone markers, such as osteopontin, osteocalcin, and collagen type I. The osteogenic capacity of hASCs seeded on PHB-HV scaffolds indicates that this scaffold is adequate for cell growth and differentiation and that aHS is a promising supplement for the in vitro expansion of hASCs. In conclusion, this strategy seems to be useful and safe for application in bone tissue engineering. © Mary Ann Liebert, Inc. Source


Ribeiro-Samy S.,University of Minho | Ribeiro-Samy S.,ICVS 3Bs Associate Laboratory | Silva N.A.,University of Minho | Silva N.A.,ICVS 3Bs Associate Laboratory | And 19 more authors.
Macromolecular Bioscience | Year: 2013

Spinal cord injury (SCI) leads to devastating neurological deficits. Several tissue engineering (TE)-based approaches have been investigated for repairing this condition. Poly (3-hydroxybutyrate-co-3-hydroxyvalerate) (PHB-HV) is found to be particularly attractive for TE applications due to its properties, such as biodegradability, biocompatibility, thermoplasticity and piezoelectricity. Hence, this report addresses the development and characterization of PHB-HV-based 3D scaffolds, produced by freeze-drying, aimed to SCI treatment. The obtained scaffolds reveal an anisotropic morphology with a fully interconnected network of pores. In vitro studies demonstrate a lack of cytotoxic effect of PHB-HV scaffolds. Direct contact assays also reveal their ability to support the culture of CNS-derived cells and mesenchymal-like stem cells from different sources. Finally, histocompatibility studies show that PHB-HV scaffolds are well tolerated by the host tissue, and do not negatively impact the left hindlimb locomotor function recovery. Therefore results herein presented suggest that PHB-HV scaffolds may be suitable for SCI treatment. Spinal cord injury (SCI) is one of the most devastating conditions affecting the central nervous system. In the present work, a novel PHB-HV scaffold is developed by freeze-drying for SCI related applications. These scaffolds reveal adequate properties to support both CNS derived cells, as well as, mesenchymal like stem cells from different sources. Moreover, it is also possible to observe that they are biocompatible with implanted in in vivo animal models. © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Source

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