101
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Biodegradable Nanofibers-Reinforced Microfibrous Composite Scaffolds for Bone Tissue Engineering. Tissue Eng Part A 2010; 16:3599-609. [DOI: 10.1089/ten.tea.2009.0779] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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102
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Alves da Silva ML, Martins A, Costa-Pinto AR, Costa P, Faria S, Gomes M, Reis RL, Neves NM. Cartilage tissue engineering using electrospun PCL nanofiber meshes and MSCs. Biomacromolecules 2010; 11:3228-36. [PMID: 21105638 DOI: 10.1021/bm100476r] [Citation(s) in RCA: 134] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Mesenchymal stem cells (MSCs) have been recognized for their ability to differentiate into cells of different tissues such as bone, cartilage, or adipose tissue, and therefore are of great interest for potential therapeutic strategies. Adherent, colony-forming, fibroblastic cells were isolated from human bone marrow aspirates, from patients undergoing knee arthroplasties, and the MSCs phenotype characterized by flow cytometry. Afterward, cells were seeded onto electrospun polycaprolactone nanofiber meshes and cultured in a multichamber flow perfusion bioreactor to determine their ability to produce cartilagineous extracellular matrix. Results indicate that the flow perfusion bioreactor increased the chondrogenic differentiation of hBM-MSCs, as confirmed either by morphological and RT-PCR analysis. Cartilage-related genes such as aggrecan, collagen type II, and Sox9 were expressed. ECM deposition was also detected by histological procedures. Collagen type II was present in the samples, as well as collagen type I. Despite no statistically significant values being obtained for gene expression, the other results support the choice of the bioreactor for this type of culture.
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Affiliation(s)
- M L Alves da Silva
- 3B’s Research Groups--Biomaterials, Biodegradables and Biomimetics, University of Minho, Headquartersof the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, AvePark, ZonaIndustrial da Gandra, S. Claudio do Barco, 4806-909 Caldas das Taipas, Guimarães, Portugal.
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103
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Araujo JV, Cunha-Reis C, Rada T, da Silva MA, Gomes ME, Yang Y, Ashammakhi N, Reis RL, El-Haj AJ, Neves NM. Dynamic culture of osteogenic cells in biomimetically coated poly(caprolactone) nanofibre mesh constructs. Tissue Eng Part A 2010; 16:557-63. [PMID: 19728792 DOI: 10.1089/ten.tea.2009.0223] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
In our previous work, biomimetic calcium phosphate-coated poly(caprolactone) nanofibre meshes (BCP-NMs) were demonstrated to be more effective for supporting cell attachment and proliferation under static conditions, when compared with poly(caprolactone) nanofibre meshes (PCL-NMs). In many applications, in vitro cultivation of constructs using bioreactors that support efficient nutrition of cells has appeared as an important step toward the development of functional grafts. This work aimed at studying the effects of dynamic culture conditions and biomimetic coating on bone cells grown on the nanofibre meshes. BCP-NM and PCL-NM were seeded with osteoblast-like cells (MG63--human osteosarcoma-derived cell line). The cell-seeded constructs were cultured within a rotating bioreactor that simulated microgravity, at a fixed rotating speed, for different time periods, and then characterized. Cell morphology, viability, and phenotype were assessed. PCL-NM constructs presented a higher number of dead cells than BCP-NM constructs. Under dynamic conditions, the production of proteins associated with the extracellular matrix of bone was higher on BCP-NM constructs than in the PCL-NM ones, which indicates that coated samples may provide cells with a better environment for tissue growth. It is suggested that improved mass transfer in the bioreactor in combination with the appropriate substrate were decisive factors for this highly positive outcome for generating bone.
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Affiliation(s)
- Jose V Araujo
- 3B's Research Group-Biomaterials, Biodegradables and Biomimetics, Department of Polymer Engineering, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Guimarães, Portugal
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104
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Guimarães A, Martins A, Pinho ED, Faria S, Reis RL, Neves NM. Solving cell infiltration limitations of electrospun nanofiber meshes for tissue engineering applications. Nanomedicine (Lond) 2010; 5:539-54. [DOI: 10.2217/nnm.10.31] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Aim: Utilize the dual composition strategy to increase the pore size and solve the low cell infiltration capacity on random nanofiber meshes, an intrinsic limitation of electrospun scaffolds for tissue engineering applications. Materials & methods: Polycaprolactone and poly(ethylene oxide) solutions were electrospun simultaneously to obtain a dual composition nanofiber mesh. Selective dissolution of the poly(ethylene oxide) nanofiber fraction was performed. The biologic performance of these enhanced pore size nanofibrous structures was assessed with human osteoblastic cells. Results: The electrospun nanofiber meshes, after the poly(ethylene oxide) dissolution, showed statistically significant larger pore sizes when compared with polycaprolactone nanofiber meshes with a similar polycaprolactone volume fraction. This was also confirmed by interferometric optical profilometry. Using scanning electron microscopy and laser scanning confocal microscopy, it was observed that osteoblastic cells could penetrate into the nanofibrous structure and migrate into the opposite and unseeded side of the mesh. Conclusion: An electrospun mesh was created with sufficient pore size to allow cell infiltration into its structure, thus resulting in a fully populated construct appropriate for 3D tissue engineering applications.
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Affiliation(s)
- Ana Guimarães
- 3B’s Research Group – Biomaterials, Biodegradables & Biomimetics, Department Polymer Engineering, University of Minho; Headquarters of the European Institute of Excellence on Tissue Engineering & Regenerative Medicine, AvePark, Zona Industrial da Gandra, S. Cláudio do Barco, 4806–909 Caldas das Taipas, Guimarães, Portugal
- IBB – Institute for Biotechnology & Bioengineering, PT Government Associated Laboratory, Braga, Portugal
| | - Albino Martins
- 3B’s Research Group – Biomaterials, Biodegradables & Biomimetics, Department Polymer Engineering, University of Minho; Headquarters of the European Institute of Excellence on Tissue Engineering & Regenerative Medicine, AvePark, Zona Industrial da Gandra, S. Cláudio do Barco, 4806–909 Caldas das Taipas, Guimarães, Portugal
- IBB – Institute for Biotechnology & Bioengineering, PT Government Associated Laboratory, Braga, Portugal
| | - Elisabete D Pinho
- 3B’s Research Group – Biomaterials, Biodegradables & Biomimetics, Department Polymer Engineering, University of Minho; Headquarters of the European Institute of Excellence on Tissue Engineering & Regenerative Medicine, AvePark, Zona Industrial da Gandra, S. Cláudio do Barco, 4806–909 Caldas das Taipas, Guimarães, Portugal
- IBB – Institute for Biotechnology & Bioengineering, PT Government Associated Laboratory, Braga, Portugal
| | - Susana Faria
- Research Centre Officina Mathematica, Department of Mathematics for Science & Technology, University of Minho, Campus de Azurém, 4800–058 Guimarães, Portugal
| | - Rui L Reis
- 3B’s Research Group – Biomaterials, Biodegradables & Biomimetics, Department Polymer Engineering, University of Minho; Headquarters of the European Institute of Excellence on Tissue Engineering & Regenerative Medicine, AvePark, Zona Industrial da Gandra, S. Cláudio do Barco, 4806–909 Caldas das Taipas, Guimarães, Portugal
- IBB – Institute for Biotechnology & Bioengineering, PT Government Associated Laboratory, Braga, Portugal
| | - Nuno M Neves
- 3B’s Research Group – Biomaterials, Biodegradables & Biomimetics, Department Polymer Engineering, University of Minho; Headquarters of the European Institute of Excellence on Tissue Engineering & Regenerative Medicine, AvePark, Zona Industrial da Gandra, S. Cláudio do Barco, 4806–909 Caldas das Taipas, Guimarães, Portugal
- IBB – Institute for Biotechnology & Bioengineering, PT Government Associated Laboratory, Braga, Portugal
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105
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Bioresorbable elastomeric vascular tissue engineering scaffolds via melt spinning and electrospinning. Acta Biomater 2010; 6:1958-67. [PMID: 20004258 DOI: 10.1016/j.actbio.2009.12.007] [Citation(s) in RCA: 118] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2009] [Revised: 10/07/2009] [Accepted: 12/03/2009] [Indexed: 01/08/2023]
Abstract
Current surgical therapy for diseased vessels less than 6mm in diameter involves bypass grafting with autologous arteries or veins. Although this surgical practice is common, it has significant limitations and complications, such as occlusion, intimal hyperplasia and compliance mismatch. As a result, cardiovascular biomaterials research has been motivated to develop tissue-engineered blood vessel substitutes. In this study, vascular tissue engineering scaffolds were fabricated using two different approaches, namely melt spinning and electrospinning. Small diameter tubes were fabricated from an elastomeric bioresorbable 50:50 poly(l-lactide-co-epsilon-caprolactone) copolymer having dimensions of 5mm in diameter and porosity of over 75%. Scaffolds electrospun from two different solvents, acetone and 1,1,1,3,3,3-hexafluoro-2-propanol were compared in terms of their morphology, mechanical properties and cell viability. Overall, the mechanical properties of the prototype tubes exceeded the transverse tensile values of natural arteries of similar caliber. In addition to spinning the polymer separately into melt-spun and electrospun constructs, the approach in this study has successfully demonstrated that these two techniques can be combined to produce double-layered tubular scaffolds containing both melt-spun macrofibers (<200microm in diameter) and electrospun submicron fibers (>400nm in diameter). Since the vascular wall has a complex multilayered architecture and unique mechanical properties, there remain several significant challenges before a successful tissue-engineered artery is achieved.
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106
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López-Rubio A, Sanchez E, Sanz Y, Lagaron JM. Encapsulation of living bifidobacteria in ultrathin PVOH electrospun fibers. Biomacromolecules 2010; 10:2823-9. [PMID: 19817490 DOI: 10.1021/bm900660b] [Citation(s) in RCA: 111] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This study shows the application of the electrospinning technique as a viable method for the encapsulation and stabilization of bifidobacterial strains. Poly(vinyl alcohol) (PVOH) was used as the encapsulating material because it is generally recognized as safe (GRAS), has a high oxygen barrier when dry, and is water soluble, hence allowing easy recovery of the bacteria for viability testing. A coaxial setup was used for encapsulation, and the so-obtained electrospun fibers had a mean diameter of ca. 150 nm. Incorporation of B. animalis Bb12 led to a decrease in melting point and crystallinity of the PVOH fibers and to an increase in the polymer glass transition temperature. The viability tests, carried out at three different temperatures (room temperature and 4 and -20 degrees C) showed that B. animalis Bb12 encapsulated within the electrospun PVOH fibers remained viable for 40 days at room temperature and for 130 days at refrigeration temperature, whereas a significant viability decrease was observed in both cases when bacteria were not encapsulated (p = 0.015 and p = 0.002, respectively).
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107
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Shi R, Zhu A, Chen D, Jiang X, Xu X, Zhang L, Tian W. In vitrodegradation of starch/PVA films and biocompatibility evaluation. J Appl Polym Sci 2010. [DOI: 10.1002/app.31136] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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108
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Silva NA, Salgado AJ, Sousa RA, Oliveira JT, Pedro AJ, Leite-Almeida H, Cerqueira R, Almeida A, Mastronardi F, Mano JF, Neves NM, Sousa N, Reis RL. Development and Characterization of a Novel Hybrid Tissue Engineering–Based Scaffold for Spinal Cord Injury Repair. Tissue Eng Part A 2010; 16:45-54. [DOI: 10.1089/ten.tea.2008.0559] [Citation(s) in RCA: 95] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Affiliation(s)
- Nuno A. Silva
- 3B's Research Group—Biomaterials, Biodegradables, and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Guimarães, Portugal
- Institute for Biotechnology and Bioengineering, PT Government Associated Lab, Guimarães, Portugal
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga, Portugal
| | - Antonio J. Salgado
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga, Portugal
| | - Rui A. Sousa
- 3B's Research Group—Biomaterials, Biodegradables, and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Guimarães, Portugal
- Institute for Biotechnology and Bioengineering, PT Government Associated Lab, Guimarães, Portugal
| | - Joao T. Oliveira
- 3B's Research Group—Biomaterials, Biodegradables, and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Guimarães, Portugal
- Institute for Biotechnology and Bioengineering, PT Government Associated Lab, Guimarães, Portugal
| | - Adriano J. Pedro
- 3B's Research Group—Biomaterials, Biodegradables, and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Guimarães, Portugal
- Institute for Biotechnology and Bioengineering, PT Government Associated Lab, Guimarães, Portugal
| | - Hugo Leite-Almeida
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga, Portugal
| | - Rui Cerqueira
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga, Portugal
| | - Armando Almeida
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga, Portugal
| | - Fabrizio Mastronardi
- Program in Molecular Structure and Function, The Hospital for Sick Children, Toronto, Canada
| | - João F. Mano
- 3B's Research Group—Biomaterials, Biodegradables, and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Guimarães, Portugal
- Institute for Biotechnology and Bioengineering, PT Government Associated Lab, Guimarães, Portugal
| | - Nuno M. Neves
- 3B's Research Group—Biomaterials, Biodegradables, and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Guimarães, Portugal
- Institute for Biotechnology and Bioengineering, PT Government Associated Lab, Guimarães, Portugal
| | - Nuno Sousa
- Life and Health Sciences Research Institute (ICVS), School of Health Sciences, University of Minho, Braga, Portugal
| | - Rui L. Reis
- 3B's Research Group—Biomaterials, Biodegradables, and Biomimetics, University of Minho, Headquarters of the European Institute of Excellence on Tissue Engineering and Regenerative Medicine, Guimarães, Portugal
- Institute for Biotechnology and Bioengineering, PT Government Associated Lab, Guimarães, Portugal
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109
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Kirkpatrick CJ, Bonfield W. NanoBioInterface: a multidisciplinary challenge. J R Soc Interface 2009; 7 Suppl 1:S1-4. [PMID: 19955123 DOI: 10.1098/rsif.2009.0489.focus] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Affiliation(s)
- C James Kirkpatrick
- Institute of Pathology, Johannes Gutenberg University, Langenbeckstrasse 1, D-55101, Mainz, Germany.
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110
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Cellular behavior on TiO2 nanonodular structures in a micro-to-nanoscale hierarchy model. Biomaterials 2009; 30:5319-29. [DOI: 10.1016/j.biomaterials.2009.06.021] [Citation(s) in RCA: 248] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2009] [Accepted: 06/12/2009] [Indexed: 11/24/2022]
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