1
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Jalal A, Ahmad S, Shah AT, Hussain T, Nawaz HA, Imran S. Preparation of celecoxib loaded bioactive glass chitosan composite hydrogels: a simple approach for therapeutic delivery of NSAIDs. Biomed Mater 2024; 19:035031. [PMID: 38518368 DOI: 10.1088/1748-605x/ad3706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2023] [Accepted: 03/22/2024] [Indexed: 03/24/2024]
Abstract
Arthritis causes inflammatory damage to joints and connective tissues. In the treatment of arthritis, precise and controlled drug delivery to the target site is among the frontline research approaches. In the present research work, celecoxib drug and bioactive glass incorporated chitosan hydrogels were fabricated by the freeze gelation method. Fourier transform infrared spectroscopy, scanning electron microscopy, and thermogravimetric analysis/differential scanning calorimetry techniques were used to characterize the hydrogels. Different kinetic models were applied to study the drug release kinetics. The celecoxib release was mainly controlled by a Fickian diffusion process followed by the Higuchi model. Maximum 86.2% drug entrapment was observed in 20 mg drug-loaded hydrogel and its swelling ratio was 115.5% in 28 d. Good hydrophilicity, good drug entrapment efficiency, and moderate drug release patterns of hydrogels can make them suitable for sustained drug release. The cytocompatibility of hydrogels was established by performing an MTT assay on the BHK-21 fibroblast cell line. The promising results have proved that hydrogels can be considered potential material for the slow release of anti-inflammatory drug at the target site in arthritis.
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Affiliation(s)
- Azra Jalal
- Department of Chemistry, Lahore College for Women University, Lahore, Pakistan
| | - Sana Ahmad
- Department of Chemistry, Lahore College for Women University, Lahore, Pakistan
| | - Asma Tufail Shah
- Interdisciplinary Research Centre in Biomedical Materials, COMSATS, Lahore, Pakistan
| | - Tousif Hussain
- Centre for Advanced Studies in Physics, GC University, Lahore, Pakistan
| | - Hafiz Awais Nawaz
- Institute of Pharmaceutical Sciences, University of Veterinary and Animal Sciences, Lahore, Pakistan
| | - Saleha Imran
- Department of Chemistry, Lahore College for Women University, Lahore, Pakistan
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2
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Allahyari Z, Casillo SM, Perry SJ, Peredo AP, Gholizadeh S, Gaborski TR. Disrupted Surfaces of Porous Membranes Reduce Nuclear YAP Localization and Enhance Adipogenesis through Morphological Changes. ACS Biomater Sci Eng 2022; 8:1791-1798. [PMID: 35363465 DOI: 10.1021/acsbiomaterials.1c01472] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The disrupted surface of porous membranes, commonly used in tissue-chip and cellular coculture systems, is known to weaken cell-substrate interactions. Here, we investigated whether disrupted surfaces of membranes with micron and submicron scale pores affect yes-associated protein (YAP) localization and differentiation of adipose-derived stem cells. We found that these substrates reduce YAP nuclear localization through decreased cell spreading, consistent with reduced cell-substrate interactions, and in turn enhance adipogenesis while decreasing osteogenesis.
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Affiliation(s)
- Zahra Allahyari
- Department of Microsystems Engineering, Rochester Institute of Technology, 160 Lomb Memorial Drive, Rochester, New York 14623, United States.,Department of Biomedical Engineering, Rochester Institute of Technology, 160 Lomb Memorial Drive, Rochester, New York 14623, United States
| | - Stephanie M Casillo
- Department of Biomedical Engineering, Rochester Institute of Technology, 160 Lomb Memorial Drive, Rochester, New York 14623, United States
| | - Spencer J Perry
- Department of Biomedical Engineering, Rochester Institute of Technology, 160 Lomb Memorial Drive, Rochester, New York 14623, United States
| | - Ana P Peredo
- Department of Biomedical Engineering, Rochester Institute of Technology, 160 Lomb Memorial Drive, Rochester, New York 14623, United States
| | - Shayan Gholizadeh
- Department of Microsystems Engineering, Rochester Institute of Technology, 160 Lomb Memorial Drive, Rochester, New York 14623, United States.,Department of Biomedical Engineering, Rochester Institute of Technology, 160 Lomb Memorial Drive, Rochester, New York 14623, United States
| | - Thomas R Gaborski
- Department of Biomedical Engineering, Rochester Institute of Technology, 160 Lomb Memorial Drive, Rochester, New York 14623, United States
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3
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Qamar AY, Hussain T, Rafique MK, Bang S, Tanga BM, Seong G, Fang X, Saadeldin IM, Cho J. The Role of Stem Cells and Their Derived Extracellular Vesicles in Restoring Female and Male Fertility. Cells 2021; 10:2460. [PMID: 34572109 PMCID: PMC8468931 DOI: 10.3390/cells10092460] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 09/10/2021] [Accepted: 09/14/2021] [Indexed: 12/21/2022] Open
Abstract
Infertility is a globally recognized issue caused by different reproductive disorders. To date, various therapeutic approaches to restore fertility have been attempted including etiology-specific medication, hormonal therapies, surgical excisions, and assisted reproductive technologies. Although these approaches produce results, however, fertility restoration is not achieved in all cases. Advances in using stem cell (SC) therapy hold a great promise for treating infertile patients due to their abilities to self-renew, differentiate, and produce different paracrine factors to regenerate the damaged or injured cells and replenish the affected germ cells. Furthermore, SCs secrete extracellular vesicles (EVs) containing biologically active molecules including nucleic acids, lipids, and proteins. EVs are involved in various physiological and pathological processes and show promising non-cellular therapeutic uses to combat infertility. Several studies have indicated that SCs and/or their derived EVs transplantation plays a crucial role in the regeneration of different segments of the reproductive system, oocyte production, and initiation of sperm production. However, available evidence triggers the need to testify the efficacy of SC transplantation or EVs injection in resolving the infertility issues of the human population. In this review, we highlight the recent literature covering the issues of infertility in females and males, with a special focus on the possible treatments by stem cells or their derived EVs.
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Affiliation(s)
- Ahmad Yar Qamar
- College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea
- College of Veterinary and Animal Sciences, Jhang, Sub-Campus of University of Veterinary and Animal Sciences, Lahore 54000, Pakistan
| | - Tariq Hussain
- College of Veterinary and Animal Sciences, Jhang, Sub-Campus of University of Veterinary and Animal Sciences, Lahore 54000, Pakistan
| | - Muhammad Kamran Rafique
- College of Veterinary and Animal Sciences, Jhang, Sub-Campus of University of Veterinary and Animal Sciences, Lahore 54000, Pakistan
| | - Seonggyu Bang
- College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea
| | - Bereket Molla Tanga
- College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea
- Faculty of Veterinary Medicine, Hawassa University, Hawassa 05, Ethiopia
| | - Gyeonghwan Seong
- College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea
| | - Xun Fang
- College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea
| | - Islam M Saadeldin
- College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea
| | - Jongki Cho
- College of Veterinary Medicine, Chungnam National University, Daejeon 34134, Korea
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4
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Takeshita S, Zhao S, Malfait WJ, Koebel MM. Chemie der Chitosan‐Aerogele: Lenkung der dreidimensionalen Poren für maßgeschneiderte Anwendungen. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202003053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Satoru Takeshita
- Building Energy Materials & Components Laboratory Eidgenössische Materialprüfungs- und Forschungsanstalt (Empa) Überlandstrasse 129 CH-8600 Dübendorf Schweiz
- Research Institute for Chemical Process Technology National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Central 5, 1-1-1 Higashi 3058565 Tsukuba Japan
| | - Shanyu Zhao
- Building Energy Materials & Components Laboratory Eidgenössische Materialprüfungs- und Forschungsanstalt (Empa) Überlandstrasse 129 CH-8600 Dübendorf Schweiz
| | - Wim J. Malfait
- Building Energy Materials & Components Laboratory Eidgenössische Materialprüfungs- und Forschungsanstalt (Empa) Überlandstrasse 129 CH-8600 Dübendorf Schweiz
| | - Matthias M. Koebel
- Building Energy Materials & Components Laboratory Eidgenössische Materialprüfungs- und Forschungsanstalt (Empa) Überlandstrasse 129 CH-8600 Dübendorf Schweiz
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5
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Takeshita S, Zhao S, Malfait WJ, Koebel MM. Chemistry of Chitosan Aerogels: Three‐Dimensional Pore Control for Tailored Applications. Angew Chem Int Ed Engl 2020; 60:9828-9851. [DOI: 10.1002/anie.202003053] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 04/06/2020] [Indexed: 01/06/2023]
Affiliation(s)
- Satoru Takeshita
- Building Energy Materials & Components Laboratory Swiss Federal Laboratories for Materials Science and Technology (Empa) Überlandstrasse 129 CH-8600 Dübendorf Switzerland
- Research Institute for Chemical Process Technology National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Central 5, 1-1-1 Higashi 3058565 Tsukuba Japan
| | - Shanyu Zhao
- Building Energy Materials & Components Laboratory Swiss Federal Laboratories for Materials Science and Technology (Empa) Überlandstrasse 129 CH-8600 Dübendorf Switzerland
| | - Wim J. Malfait
- Building Energy Materials & Components Laboratory Swiss Federal Laboratories for Materials Science and Technology (Empa) Überlandstrasse 129 CH-8600 Dübendorf Switzerland
| | - Matthias M. Koebel
- Building Energy Materials & Components Laboratory Swiss Federal Laboratories for Materials Science and Technology (Empa) Überlandstrasse 129 CH-8600 Dübendorf Switzerland
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6
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Sukul M, Sahariah P, Lauzon HL, Borges J, Másson M, Mano JF, Haugen HJ, Reseland JE. In vitro biological response of human osteoblasts in 3D chitosan sponges with controlled degree of deacetylation and molecular weight. Carbohydr Polym 2020; 254:117434. [PMID: 33357907 DOI: 10.1016/j.carbpol.2020.117434] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2020] [Revised: 10/03/2020] [Accepted: 11/19/2020] [Indexed: 12/22/2022]
Abstract
We have studied the effect of chitosan sponges, produced from chitosan batches with distinct degree of deacetylation (DDA) and molecular weight (Mw), on the adhesion, growth and differentiation of primary human osteoblasts with an aim to offer a suitable tool for guided bone regeneration. All the chitosan sponges revealed similar microstructure, irrespective of the DDA (58, 73, 82, 88, and 91 %) and Mw (749, 547, 263, 215, and 170 kDa, respectively). Cell spreading was higher on sponges having a higher DDA. Higher DDA induced a more pronounced increase in alkaline phosphatase activity, osteopontin (OPN), vascular endothelial growth factor-A (VEGF), interleukin-6 (IL-6), and reduction in monocyte chemoattractant protein-1 (MCP-1), sclerostin (SOST) and dickkopf related protein-1 as compared to lower DDA. Lower DDA induced the increased secretion of osteoprotegerin and SOST as compared to higher DDA. The combination of higher DDA and Mw induced an increased secretion of VEGF and IL-6, however reduced the secretion of OPN as compared to chitosan with similar DDA but with lower Mw. In summary, the variations in cellular responses to the different chitosan sponges indicate a potential for individual tailoring of desired responses in guided bone regeneration.
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Affiliation(s)
- Mousumi Sukul
- Department of Biomaterials, Institute of Clinical Dentistry, University of Oslo, 0317 Oslo, Norway.
| | - Priyanka Sahariah
- Faculty of Pharmaceutical Sciences, School of Health Sciences, University of Iceland, Hofsvallagata 53, IS-107 Reykjavík, Iceland
| | | | - João Borges
- Department of Chemistry, CICECO - Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Már Másson
- Faculty of Pharmaceutical Sciences, School of Health Sciences, University of Iceland, Hofsvallagata 53, IS-107 Reykjavík, Iceland
| | - João F Mano
- Department of Chemistry, CICECO - Aveiro Institute of Materials, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal
| | - Håvard J Haugen
- Department of Biomaterials, Institute of Clinical Dentistry, University of Oslo, 0317 Oslo, Norway
| | - Janne E Reseland
- Department of Biomaterials, Institute of Clinical Dentistry, University of Oslo, 0317 Oslo, Norway
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7
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Tavares MT, Oliveira MB, Gaspar VM, Mano JF, S. Farinha JP, Baleizão C. Efficient Single‐Dose Induction of Osteogenic Differentiation of Stem Cells Using Multi‐Bioactive Hybrid Nanocarriers. ACTA ACUST UNITED AC 2020; 4:e2000123. [DOI: 10.1002/adbi.202000123] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Revised: 08/10/2020] [Indexed: 12/29/2022]
Affiliation(s)
- Márcia T. Tavares
- Department of ChemistryCICECO – Aveiro Institute of Materials University of AveiroCampus Universitário de Santiago Aveiro 3810‐193 Portugal
- Centro de Química Estrutural and Department of Chemical EngineeringInstituto Superior Técnico Universidade de Lisboa Lisboa 1049‐001 Portugal
| | - Mariana B. Oliveira
- Department of ChemistryCICECO – Aveiro Institute of Materials University of AveiroCampus Universitário de Santiago Aveiro 3810‐193 Portugal
| | - Vítor M. Gaspar
- Department of ChemistryCICECO – Aveiro Institute of Materials University of AveiroCampus Universitário de Santiago Aveiro 3810‐193 Portugal
| | - João F. Mano
- Department of ChemistryCICECO – Aveiro Institute of Materials University of AveiroCampus Universitário de Santiago Aveiro 3810‐193 Portugal
| | - José Paulo S. Farinha
- Centro de Química Estrutural and Department of Chemical EngineeringInstituto Superior Técnico Universidade de Lisboa Lisboa 1049‐001 Portugal
| | - Carlos Baleizão
- Centro de Química Estrutural and Department of Chemical EngineeringInstituto Superior Técnico Universidade de Lisboa Lisboa 1049‐001 Portugal
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8
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Jindal A, Mondal T, Bhattacharya J. An in vitro evaluation of zinc silicate fortified chitosan scaffolds for bone tissue engineering. Int J Biol Macromol 2020; 164:4252-4262. [PMID: 32910962 DOI: 10.1016/j.ijbiomac.2020.09.018] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 08/24/2020] [Accepted: 09/03/2020] [Indexed: 12/17/2022]
Abstract
Tissue engineering aims at replacement, repair, and regeneration of tissues by a combination of scaffolds, growth factors, and cells. In this study, we report the synthesis of biodegradable composite scaffolds fortified with mesoporous zinc silicate (mZS) and assessment of in vitro properties for bone tissue engineering (BTE) applications. The scaffolds consisted of chitosan (CS) incorporated with mZS at 0.1, 0.2, 0.3, and 0.5 wt%. The bio-composite scaffolds were visualized using Field Emission Scanning Electron Microscopy (FE-SEM). The incorporation of mZS was confirmed using Energy dispersive x-ray (EDS) analysis. Biomineralization studies were conducted in simulated body fluid (SBF) and indicated bioactivity of fabricated scaffolds. The scaffolds also displayed antibacterial action against Staphylococcus aureus. Cellular attachment within the scaffold network established biocompatibility of the material. Incorporation of mZS within the chitosan scaffolds matrix improved properties such as porosity, degradation rate, and biomineralization. Therefore, fabricated scaffolds exhibit exceptional features and have the potential to serve as an implant for BTE applications.
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Affiliation(s)
- Ajita Jindal
- School of Biotechnology, Jawaharlal Nehru University, New Delhi 110067, India
| | - Titas Mondal
- School of Biotechnology, Jawaharlal Nehru University, New Delhi 110067, India
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9
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Rather HA, Patel R, Yadav UCS, Vasita R. Dual drug-delivering polycaprolactone-collagen scaffold to induce early osteogenic differentiation and coupled angiogenesis. ACTA ACUST UNITED AC 2020; 15:045008. [PMID: 32427577 DOI: 10.1088/1748-605x/ab7978] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Bone regeneration is a multi-step, overlapping process, in which angiogenesis and osteogenesis are the key players. Several attempts have been made to promote angiogenesis-coupled osteogenesis using scaffolding technology. However, the recreation of functional vasculature during bone regeneration is an unparalleled challenge. In this study, a dual drug-delivering polycaprolactone-collagen fibrous scaffold is reported to promote early osteogenesis and angiogenesis. Simvastatin as a pro-angiogenic and dexamethasone as an osteoinductive drug were encapsulated to functionalize the electrospun fibers. The optically transparent fibrous mat represented the sustained and sequential release of drugs for 28 days. The fibrous mesh increased cell proliferation and enhanced the osteogenic differentiation up to 21 days. The alkaline phosphatase activity and mineral deposition were comparatively higher on dual drug-releasing fibers when compared to control fibers. The dual drug-releasing osteoconductive fibers demonstrated osteogenesis as early as 7 days with a 3.7 and 1.5 fold increase in the expression of osteogenic differentiation markers (RUNX2 and osteocalcin), respectively. In vitro angiogenesis using primary human umbilical vein endothelial cells (pHUVECs) showed no significant difference in cell proliferation among control fibers and dual drug-releasing fibers. However, the angioinductive nature of simvastatin released from the fibers demonstrated tube formation and 2 fold higher angiogenic score. The mRNA and protein expression study of angiogenic markers (VEGFR2 and eNOS) by polymerase chain reaction and western blotting depicted the angioinducing potential of dual drug-releasing fibers. VEGFR2 and eNOS mRNA expressions increased by 1.1 and 1.6 fold, respectively, whereas their protein expression increased by 3.2 and 1.7 fold, respectively. The overall results demonstrate the synergistic effect of osteoconductive substrate and osteoinductive dual drugs to promote early osteogenesis, and release of the pro-angiogenic drug promotes angiogenesis.
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Affiliation(s)
- Hilal Ahmad Rather
- Biomaterials & Biomimetics laboratory, School of Life Sciences, Central University of Gujarat, Gandhinagar, 382030 India
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10
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Gugjoo MB, Amarpal, Fazili MUR, Shah RA, Saleem Mir M, Sharma GT. Goat mesenchymal stem cell basic research and potential applications. Small Rumin Res 2020. [DOI: 10.1016/j.smallrumres.2019.106045] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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11
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Tavares MT, Oliveira MB, Mano JF, Farinha JPS, Baleizão C. Bioactive silica nanoparticles with calcium and phosphate for single dose osteogenic differentiation. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2020; 107:110348. [DOI: 10.1016/j.msec.2019.110348] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 10/12/2019] [Accepted: 10/20/2019] [Indexed: 12/25/2022]
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12
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Re F, Sartore L, Moulisova V, Cantini M, Almici C, Bianchetti A, Chinello C, Dey K, Agnelli S, Manferdini C, Bernardi S, Lopomo NF, Sardini E, Borsani E, Rodella LF, Savoldi F, Paganelli C, Guizzi P, Lisignoli G, Magni F, Salmeron-Sanchez M, Russo D. 3D gelatin-chitosan hybrid hydrogels combined with human platelet lysate highly support human mesenchymal stem cell proliferation and osteogenic differentiation. J Tissue Eng 2019; 10:2041731419845852. [PMID: 31105928 PMCID: PMC6507314 DOI: 10.1177/2041731419845852] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2019] [Accepted: 04/02/2019] [Indexed: 01/25/2023] Open
Abstract
Bone marrow and adipose tissue human mesenchymal stem cells were seeded in highly performing 3D gelatin–chitosan hybrid hydrogels of varying chitosan content in the presence of human platelet lysate and evaluated for their proliferation and osteogenic differentiation. Both bone marrow and adipose tissue human mesenchymal stem cells in gelatin–chitosan hybrid hydrogel 1 (chitosan content 8.1%) or gelatin–chitosan hybrid hydrogel 2 (chitosan 14.9%) showed high levels of viability (80%–90%), and their proliferation and osteogenic differentiation was significantly higher with human platelet lysate compared to fetal bovine serum, particularly in gelatin–chitosan hybrid hydrogel 1. Mineralization was detected early, after 21 days of culture, when human platelet lysate was used in the presence of osteogenic stimuli. Proteomic characterization of human platelet lysate highlighted 59 proteins mainly involved in functions related to cell adhesion, cellular repairing mechanisms, and regulation of cell differentiation. In conclusion, the combination of our gelatin–chitosan hybrid hydrogels with hPL represents a promising strategy for bone regenerative medicine using human mesenchymal stem cells.
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Affiliation(s)
- Federica Re
- Department of Clinical and Experimental Sciences, University of Brescia, Bone Marrow Transplant Unit, ASST Spedali Civili, Brescia, Italy.,Centro di Ricerca Emato-Oncologica AIL (CREA), ASST Spedali Civili, Brescia, Italy
| | - Luciana Sartore
- Department of Mechanical and Industrial Engineering, University of Brescia, Brescia, Italy
| | - Vladimira Moulisova
- Biomedical Center, Faculty of Medicine in Pilsen, Charles University, Pilsen, Czech Republic.,Centre for the Cellular Microenvironment, Division of Biomedical Engineering, School of Engineering, University of Glasgow, Glasgow, UK
| | - Marco Cantini
- Centre for the Cellular Microenvironment, Division of Biomedical Engineering, School of Engineering, University of Glasgow, Glasgow, UK
| | - Camillo Almici
- Department of Transfusion Medicine, Laboratory for Stem Cells Manipulation and Cryopreservation, ASST Spedali Civili, Brescia, Italy
| | - Andrea Bianchetti
- Department of Transfusion Medicine, Laboratory for Stem Cells Manipulation and Cryopreservation, ASST Spedali Civili, Brescia, Italy
| | - Clizia Chinello
- Department of Medicine and Surgery, Clinical Proteomics and Metabolomics Unit, University of Milano-Bicocca, Vedano al Lambro, Italy
| | - Kamol Dey
- Department of Mechanical and Industrial Engineering, University of Brescia, Brescia, Italy
| | - Silvia Agnelli
- Department of Mechanical and Industrial Engineering, University of Brescia, Brescia, Italy
| | - Cristina Manferdini
- IRCCS Istituto Ortopedico Rizzoli, Laboratorio di Immunoreumatologia e Rigenerazione Tissutale, IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy
| | - Simona Bernardi
- Department of Clinical and Experimental Sciences, University of Brescia, Bone Marrow Transplant Unit, ASST Spedali Civili, Brescia, Italy.,Centro di Ricerca Emato-Oncologica AIL (CREA), ASST Spedali Civili, Brescia, Italy
| | - Nicola F Lopomo
- Department of Information Engineering, University of Brescia, Brescia, Italy
| | - Emilio Sardini
- Department of Information Engineering, University of Brescia, Brescia, Italy
| | - Elisa Borsani
- Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy.,Interdipartimental University Center of Research "Adaptation and Regeneration of Tissues and Organs (ARTO)," University of Brescia, Brescia, Italy
| | - Luigi F Rodella
- Department of Clinical and Experimental Sciences, University of Brescia, Brescia, Italy.,Interdipartimental University Center of Research "Adaptation and Regeneration of Tissues and Organs (ARTO)," University of Brescia, Brescia, Italy
| | - Fabio Savoldi
- Department of Orthodontics, Dental School, University of Brescia, Brescia, Italy.,Dental Materials Science, Discipline of Applied Oral Sciences, Faculty of Dentistry, The University of Hong Kong, Hong Kong
| | - Corrado Paganelli
- Department of Orthodontics, Dental School, University of Brescia, Brescia, Italy
| | - Pierangelo Guizzi
- Orthopedics and Traumatology Unit, ASST Spedali Civili, Brescia, Italy
| | - Gina Lisignoli
- IRCCS Istituto Ortopedico Rizzoli, Laboratorio di Immunoreumatologia e Rigenerazione Tissutale, IRCCS Istituto Ortopedico Rizzoli, Bologna, Italy
| | - Fulvio Magni
- Department of Medicine and Surgery, Clinical Proteomics and Metabolomics Unit, University of Milano-Bicocca, Vedano al Lambro, Italy
| | - Manuel Salmeron-Sanchez
- Centre for the Cellular Microenvironment, Division of Biomedical Engineering, School of Engineering, University of Glasgow, Glasgow, UK
| | - Domenico Russo
- Department of Clinical and Experimental Sciences, University of Brescia, Bone Marrow Transplant Unit, ASST Spedali Civili, Brescia, Italy
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13
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Poly(3-hydroxybutyrate)/poly(ethylene glycol) scaffolds with different microstructure: the effect on growth of mesenchymal stem cells. 3 Biotech 2018; 8:328. [PMID: 30073113 DOI: 10.1007/s13205-018-1350-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Accepted: 07/11/2018] [Indexed: 12/13/2022] Open
Abstract
Development of biocompatible 3D scaffolds is one of the most important challenges in tissue engineering. In this study, we developed polymer scaffolds of different design and microstructure to study cell growth in them. To obtain scaffolds of various microstructure, e.g., size of pores, we used double- and one-stage leaching methods using porogens with selected size of crystals. A composite of poly(3-hydroxybutyrate) (PHB) with poly(ethylene glycol) (PEG) (PHB/PEG) was used as polymer biomaterial for scaffolds. The morphology of scaffolds was analyzed by scanning electron microscopy; the Young modulus of scaffolds was measured by rheometry. The ability to support growth of mesenchymal stem cells (MSCs) in scaffolds was studied using the XTT assay; the phenotype of MSC was preliminarily confirmed by flow cytometry and the activity of alkaline phosphatase and expression level of CD45 marker was studied to test possible MSC osteogenic differentiation. The obtained scaffolds had different microstructure: the scaffolds with uniform pore size of about 125 µm (normal pores) and 45 µm (small pores) and scaffolds with broadly distributed pores size from about 50-100 µm. It was shown that PHB/PEG scaffolds with uniform pores of normal size did not support MSCs growth probably due to their marked spontaneous osteogenic differentiation in these scaffolds, whereas PHB/PEG scaffolds with diverse pore size promoted stem cells growth that was not accompanied by pronounced differentiation. In scaffolds with small pores (about 45 µm), the growth of MSC was the lowest and cell growth suppression was only partially related to stem cells differentiation. Thus, apparently, the broadly distributed pore size of PHB/PEG scaffolds promoted MSC growth in them, whereas uniform size of scaffold pores stimulated MSC osteogenic differentiation.
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14
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Jhala D, Rather H, Vasita R. Polycaprolactone-chitosan nanofibers influence cell morphology to induce early osteogenic differentiation. Biomater Sci 2018; 4:1584-1595. [PMID: 27709134 DOI: 10.1039/c6bm00492j] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Osteogenic differentiation is highly correlated with cell morphology. Morphological changes are a stimulus as well as a consequence of the differentiation process. Besides, geometrical, biochemical and mechanical properties of a substrate can modulate cell adhesion and morphology. Therefore, in the current study, nanofibrous substrate properties were used to implement necessary changes in cell morphology which induced osteogenic differentiation without biological supplements. A polycaprolactone-chitosan nanofiber substrate had been fabricated with an average diameter of ∼75 nm and an appropriate ratio of polymers that balances surface biocompatibility as well as mechanical strength. DSC and wide-angle XRD analysis revealed miscibility between polymers; whereas a degradation study confirmed the structural integrity of nanofibers. Nanofibers did not cause any cytotoxicity to MC3T3-E1 cells as confirmed by Live/Dead® staining. Morphological studies by SEM and confocal microscopy showed significant changes in terms of cell shape, area, compactness, aspect ratio and nucleus area in cells grown on nanofibers which indicated the osteogenic differentiation inducing potential of nanofibers. This was further confirmed by enhanced mineral deposition and alkaline phosphatase activity up to three weeks. In summary, polycaprolactone-chitosan nanofibers could induce early osteogenic differentiation in MC3T3-E1 pre-osteoblasts without any biological supplements by modulating cell morphology. Moreover, cell morphological features can be used as a predictive and informative approach at the early stages of differentiation experiments.
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Affiliation(s)
- D Jhala
- Biomaterials & Biomimetics laboratory, School of Life Sciences, Central University of Gujarat, Gandhinagar, India.
| | - H Rather
- Biomaterials & Biomimetics laboratory, School of Life Sciences, Central University of Gujarat, Gandhinagar, India.
| | - R Vasita
- Biomaterials & Biomimetics laboratory, School of Life Sciences, Central University of Gujarat, Gandhinagar, India.
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Gu L, Nessim EE, Macosko CW. Reactive compatibilization of poly(lactic acid)/polystyrene blends and its application to preparation of hierarchically porous poly(lactic acid). POLYMER 2018. [DOI: 10.1016/j.polymer.2017.11.054] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Kumbhar SG, Pawar SH. Synthesis and characterization of chitosan-alginate scaffolds for seeding human umbilical cord derived mesenchymal stem cells. Biomed Mater Eng 2017; 27:561-575. [PMID: 28234241 DOI: 10.3233/bme-161609] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
BACKGROUND Chitosan and alginate are two natural and accessible polymers that are known to be biocompatible, biodegradable and possesses good antimicrobial activity. When combined, they exhibit desirable characteristics and can be created into a scaffold for cell culture. OBJECTIVE In this study interaction of chitosan-alginate scaffolds with mesenchymal stem cells are studied. METHODS Mesenchymal stem cells were derived from human umbilical cord tissues, characterized by flow cytometry and other growth parameters studied as well. Proliferation and viability of cultured cells were studied by MTT Assay and Trypan Blue dye exclusion assay. RESULTS Besides chitosan-alginate scaffold was prepared by freeze-drying method and characterized by FTIR, SEM and Rheological properties. The obtained 3D porous structure allowed very efficient seeding of hUMSCs that are able to inhabit the whole volume of the scaffold, showing good adhesion and proliferation. These materials showed desirable rheological properties for facile injection as tissue scaffolds. CONCLUSION The results of this study demonstrated that chitosan-alginate scaffold may be promising biomaterial in the field of tissue engineering, which is currently under a great deal of examination for the development and/or restoration of tissue and organs. It combines the stem cell therapy and biomaterials.
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Affiliation(s)
- Sneha G Kumbhar
- Centre for Interdisciplinary Research, D.Y. Patil University, Maharashtra State Highway 277, Line Bazar, Kasaba Bawada, Kolhapur, Maharashtra 416006, India. E-mails: ,
| | - S H Pawar
- Centre for Interdisciplinary Research, D.Y. Patil University, Maharashtra State Highway 277, Line Bazar, Kasaba Bawada, Kolhapur, Maharashtra 416006, India. E-mails: ,
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Antolinos-Turpín CM, Morales Román RM, Rodenas-Rochina J, Gómez Ribelles JL, Gómez-Tejedor JA. Macroporous thin membranes for cell transplant in regenerative medicine. Biomaterials 2015; 67:254-63. [PMID: 26231916 DOI: 10.1016/j.biomaterials.2015.07.032] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2015] [Revised: 07/16/2015] [Accepted: 07/16/2015] [Indexed: 10/23/2022]
Abstract
The aim of this paper is to present a method to produce macroporous thin membranes made of poly (ethyl acrylate-co-hydroxyethyl acrylate) copolymer network with varying cross-linking density for cell transplantation and prosthesis fabrication. The manufacture process is based on template techniques and anisotropic pore collapse. Pore collapse was produced by swelling the membrane in acetone and subsequently drying and changing the solvent by water to produce 100 microns thick porous membranes. These very thin membranes are porous enough to hold cells to be transplanted to the organism or to be colonized by ingrowth from neighboring tissues in the organism, and they present sufficient tearing stress to be sutured with surgical thread. The obtained pore morphology was observed by Scanning Electron Microscope, and confocal laser microscopy. Mechanical properties were characterized by stress-strain experiments in tension and tearing strength measurements. Morphology and mechanical properties were related to the different initial thickness of the scaffold and the cross-linking density of the polymer network. Seeding efficiency and proliferation of mesenchymal stem cells inside the pore structure were determined at 2 h, 1, 7, 14 and 21 days from seeding.
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Affiliation(s)
- C M Antolinos-Turpín
- Centre for Biomaterials and Tissue Engineering, CBIT, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
| | - R M Morales Román
- Centre for Biomaterials and Tissue Engineering, CBIT, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
| | - J Rodenas-Rochina
- Centre for Biomaterials and Tissue Engineering, CBIT, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain
| | - J L Gómez Ribelles
- Centre for Biomaterials and Tissue Engineering, CBIT, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain; Networking Research Center on Bioengineering, Biomaterials and Nanomedicine (CIBER-BBN), Valencia, Spain
| | - J A Gómez-Tejedor
- Centre for Biomaterials and Tissue Engineering, CBIT, Universitat Politècnica de València, Camino de Vera s/n, 46022 Valencia, Spain.
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What is the future of 'organ transplantation' in the head and neck? Curr Opin Otolaryngol Head Neck Surg 2015; 22:429-35. [PMID: 25101936 DOI: 10.1097/moo.0000000000000087] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
PURPOSE OF REVIEW To update readers on the current state and future of head and neck tissue transplantation. RECENT FINDINGS Many exciting advances have recently occurred in the field of head and neck transplantation and regenerative medicine. Larynx, face, and trachea transplants have all been successfully performed. Significant advancements in tissue engineering have occurred, including the ability to generate three-dimensional tissue structures. Transplantation of regenerated tissues has been successfully incorporated into airway reconstruction. SUMMARY These exciting advancements set the foundation to expand reconstructive options for dysfunctional tissues and to improve a patient's quality of life.
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Chen Z, Zhao M, Liu K, Wan Y, Li X, Feng G. Novel chitosan hydrogel formed by ethylene glycol chitosan, 1,6-diisocyanatohexan and polyethylene glycol-400 for tissue engineering scaffold: in vitro and in vivo evaluation. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2014; 25:1903-1913. [PMID: 24805882 DOI: 10.1007/s10856-014-5223-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Accepted: 04/19/2014] [Indexed: 06/03/2023]
Abstract
Traditional chitosan hydrogels were prepared by chemical or physical crosslinker, and both of the two kinds of hydrogels have their merits and demerits. In this study, researchers attempted to prepare one kind of chitosan hydrogel by slightly crosslinker, which could combine the advantages of the two kinds of hydrogels. In this experiment, the crosslinker was formed by a reaction between the isocyanate group of 1,6-diisocyanatohexan and the hydroxyl group of polyethylene glycol-400 (PEG-400), then the crosslinker reacted with the amidine and the hydroxyl group of ethylene glycol chitosan to form the network structure. Physical properties of the hydrogel were tested by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and biodegradation. Biocompatibility was assessed by cell implantation in vitro and the scaffold was used as a cartilage tissue engineering scaffold to repair a defect in rabbit knee joints in vivo. FTIR results show the formation of a covalent bond during thickening of the ethylene glycol chitosan. SEM and degradation experiments showed that the ethylene glycol chitosan hydrogel is a 3-D, porous, and degradable scaffold. The hydrogel contained 2% ethylene glycol chitosan and 10 μl crosslinker was selected for the biocompatibility experiment in vitro and in vivo. After chondrocytes were cultured in the ethylene glycol chitosan hydrogel scaffold for 1 week cells exhibited clustered growth and had generated extracellular matrix on the scaffold in vitro. The results in vivo showed that hydrogel-chondrocytes promoted the repair of defect in rabbits. Based on these results, it could be concluded that ethylene glycol chitosan hydrogel is a scaffold with excellent physicochemical properties and it is a promising tissue engineering scaffold.
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Affiliation(s)
- Zhu Chen
- Institute of Tissue Engineering and Stem Cells, Nanchong Central Hospital and the Second Clinical Institute of North Sichuan Medical University, Nanchong, 637000, Sichuan, China
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Abstract
Bone defects requiring grafts to promote healing are frequently occurring and costly problems in health care. Chitosan, a biodegradable, naturally occurring polymer, has drawn considerable attention in recent years as scaffolding material in tissue engineering and regenerative medicine. Chitosan is especially attractive as a bone scaffold material because it supports the attachment and proliferation of osteoblast cells as well as formation of mineralized bone matrix. In this review, we discuss the fundamentals of bone tissue engineering and the unique properties of chitosan as a scaffolding material to treat bone defects for hard tissue regeneration. We present the common methods for fabrication and characterization of chitosan scaffolds, and discuss the influence of material preparation and addition of polymeric or ceramic components or biomolecules on chitosan scaffold properties such as mechanical strength, structural integrity, and functional bone regeneration. Finally, we highlight recent advances in development of chitosan-based scaffolds with enhanced bone regeneration capability.
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Affiliation(s)
- Sheeny Lan Levengood
- Department of Materials Science & Engineering, University of Washington, Seattle, WA 98195 USA
| | - Miqin Zhang
- Department of Materials Science & Engineering, University of Washington, Seattle, WA 98195 USA
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Mehrotra D. TMJ Bioengineering: A review. J Oral Biol Craniofac Res 2013; 3:140-5. [PMID: 25737903 PMCID: PMC3941445 DOI: 10.1016/j.jobcr.2013.07.007] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Accepted: 07/30/2013] [Indexed: 01/09/2023] Open
Abstract
Regeneration using scaffolds, growth factors, and stem cells is being investigated worldwide. Pubmed search for scaffolds for condyle resulted in 102 articles, of which 24 analyzed Temporomandibular joint (TMJ) scaffolds and only 6 evaluated hydroxyapatite scaffolds. 17 articles report studies on TMJ disc regeneration. The ideal bone construct for repair should be able to replicate the lost structure, restore function, be harmless, reliable and biodegradable. Scaffolds act as carriers for mesenchymal stem cells and/or growth factors and are useful for cell adhesion, migration, proliferation, and differentiation. Gene therapy has also led to the accelerated effective bone regeneration. The major materials used as scaffolds are natural or synthetic polymers, ceramics, composite materials, and electrospun nanofibers. Mesenchymal stem cells are responsible for the formation of virtually all dental, oral, and craniofacial structures. Tissue-engineered bone can possess the customized shape and dimensions. It has the potential for the biological replacement of craniofacial bones.
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Affiliation(s)
- Divya Mehrotra
- Professor, Department of Oral & Maxillofacial Surgery, King George's Medical University, Lucknow, Uttar Pradesh, India
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Dessì M, Borzacchiello A, Mohamed THA, Abdel-Fattah WI, Ambrosio L. Novel biomimetic thermosensitive β-tricalcium phosphate/chitosan-based hydrogels for bone tissue engineering. J Biomed Mater Res A 2013; 101:2984-93. [PMID: 23873836 DOI: 10.1002/jbm.a.34592] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2012] [Revised: 11/30/2012] [Accepted: 01/03/2013] [Indexed: 11/11/2022]
Abstract
Among the less invasive surgical procedures for tissue engineering application, injectable in situ gelling systems have gained great attention. In this contest, this article is aimed to realize thermosensitive chitosan-based hydrogels, crosslinked with β-glycerophosphate and reinforced via physical interactions with β-tricalcium phosphate. The kinetics of sol-gel transition and the composite hydrogel properties were investigated by rheological analysis. The hydrogels were also characterized by Fourier transform infrared study, X-ray diffraction, scanning electron microscopy, transmission electron microscopy analysis, and thermal and biological studies. The hydrogels exhibit a gel-phase transition at body temperature, and a three-dimensional network with typical rheological properties of a strong gel. The presence of the inorganic phase, made up of nanocrystals, provides a structure with chemico-physical composition that mimics natural bone tissue, favoring cellular activity. These findings suggest the potential of the materials as promising candidates for hard tissue regeneration.
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Affiliation(s)
- M Dessì
- Institute of Composite and Biomedical Material, National research Council of Italy, Naples, 80125, Italy
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Petrovic V, Zivkovic P, Petrovic D, Stefanovic V. Craniofacial bone tissue engineering. Oral Surg Oral Med Oral Pathol Oral Radiol 2013; 114:e1-9. [PMID: 22862985 DOI: 10.1016/j.oooo.2012.02.030] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2011] [Revised: 01/18/2012] [Accepted: 02/29/2012] [Indexed: 12/17/2022]
Abstract
There are numerous conditions, such as trauma, cancer, congenital malformations, and progressive deforming skeletal diseases, that can compromise the function and architectonics of bones of craniofacial region. The need to develop new approaches for treatment of these disorders arises from the fact that conventional therapeutic strategies face many obstacles and limitations. The use of tissue engineering in regeneration of craniofacial bone structures is a very promising possibility and a great challenge for researchers and practitioners. Developments in stem cell biology and engineering have led to the discovery of different stem cell populations and biodegradable materials with suitable properties. This review summarizes the current achievements in tissue engineering of craniofacial bone, temporomandibular joint, and periodontal ligament.
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Affiliation(s)
- Vladimir Petrovic
- Department of Histology, Stem Cells Laboratory, University School of Medicine, Nis, Serbia
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25
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García-Giralt N, García Cruz DM, Nogues X, Ivirico JLE, Ribelles JLG. Chitosan microparticles for “in vitro” 3D culture of human chondrocytes. RSC Adv 2013. [DOI: 10.1039/c3ra23173a] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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García Cruz DM, Salmerón-Sánchez M, Gómez-Ribelles JL. Stirred flow bioreactor modulates chondrocyte growth and extracellular matrix biosynthesis in chitosan scaffolds. J Biomed Mater Res A 2012; 100:2330-41. [DOI: 10.1002/jbm.a.34174] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2011] [Revised: 02/15/2012] [Accepted: 03/06/2012] [Indexed: 02/05/2023]
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Lee JTY, Chow KL. SEM sample preparation for cells on 3D scaffolds by freeze-drying and HMDS. SCANNING 2012; 34:12-25. [PMID: 22532079 DOI: 10.1002/sca.20271] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2011] [Accepted: 07/06/2011] [Indexed: 05/06/2023]
Abstract
Common dehydration methods of cells on biomaterials for scanning electron microscopy (SEM) include air drying, hexamethyldisilazane (HMDS) or tetramethysilane (TMS) treatment and critical point drying (CPD). On the other side, freeze-drying has been widely employed in dehydrating biological samples and also in preparing porous biomaterial scaffolds but not in preparing cells on three-dimensional (3D) biomaterials for SEM examination. In this study, we compare cells on porous hydroxyapatite (HA) prepared by air drying, HMDS and freeze-drying. The effects of fixation and using phosphate buffered saline (PBS) in the fixation were also assessed on three porous calcium phosphate (CaP) materials, namely, HA, α-tricalcium phosphate (α-TCP) and β-tricalcium phosphate (β-TCP) samples. There is no significant difference in samples prepared by HMDS treatment and freeze-drying viewed at low magnification. Besides, it is better not to use phosphate buffer in the fixation step for CaP materials to avoid undesirable spontaneous precipitation of CaPs. On the other hand, fewer exchanges of liquids are required for freeze-drying and hence chemical fixation may not be absolutely required for samples prepared by freeze-drying. Other technical details of the preparation were also investigated and discussed. This study suggests both HMDS and freeze-drying can be employed to dehydrate cells on 3D scaffolds for SEM examination.
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Affiliation(s)
- Juliana Tsz Yan Lee
- Bioengineering Graduate Program, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong.
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Is macroporosity absolutely required for preliminary in vitro bone biomaterial study? A comparison between porous materials and flat materials. J Funct Biomater 2011; 2:308-37. [PMID: 24956447 PMCID: PMC4030915 DOI: 10.3390/jfb2040308] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2011] [Revised: 10/19/2011] [Accepted: 10/26/2011] [Indexed: 12/16/2022] Open
Abstract
Porous materials are highly preferred for bone tissue engineering due to space for blood vessel ingrowth, but this may introduce extra experimental variations because of the difficulty in precise control of porosity. In order to decide whether it is absolutely necessary to use porous materials in in vitro comparative osteogenesis study of materials with different chemistries, we carried out osteoinductivity study using C3H/10T1/2 cells, pluripotent mesenchymal stem cells (MSCs), on seven material types: hydroxyapatite (HA), α-tricalcium phosphate (α-TCP) and b-tricalcium phosphate (β-TCP) in both porous and dense forms and tissue culture plastic. For all materials under test, dense materials give higher alkaline phosphatase gene (Alp) expression compared with porous materials. In addition, the cell density effects on the 10T1/2 cells were assessed through alkaline phosphatase protein (ALP) enzymatic assay. The ALP expression was higher for higher initial cell plating density and this explains the greater osteoinductivity of dense materials compared with porous materials for in vitro study as porous materials would have higher surface area. On the other hand, the same trend of Alp mRNA level (HA > β-TCP > α-TCP) was observed for both porous and dense materials, validating the use of dense flat materials for comparative study of materials with different chemistries for more reliable comparison when well-defined porous materials are not available. The avoidance of porosity variation would probably facilitate more reproducible results. This study does not suggest porosity is not required for experiments related to bone regeneration application, but emphasizes that there is often a tradeoff between higher clinical relevance, and less variation in a less complex set up, which facilitates a statistically significant conclusion. Technically, we also show that the base of normalization for ALP activity may influence the conclusion and there may be ALP activity from serum, necessitating the inclusion of "no cell" control in ALP activity assay with materials. These explain the opposite conclusions drawn by different groups on the effect of porosity.
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