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Ferrie L, Premnath P, Olsen A, Larijani L, Besler BA, Rancourt DE, Duncan NA, Underhill TM, Krawetz RJ. Exogenously delivered iPSCs disrupt the natural repair response of endogenous MPCs after bone injury. Sci Rep 2023; 13:9378. [PMID: 37296277 PMCID: PMC10256810 DOI: 10.1038/s41598-023-36609-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 06/07/2023] [Indexed: 06/12/2023] Open
Abstract
Promoting bone healing including fracture non-unions are promising targets for bone tissue engineering due to the limited success of current clinical treatment methods. There has been significant research on the use of stem cells with and without biomaterial scaffolds to treat bone fractures due to their promising regenerative capabilities. However, the relative roles of exogenous vs. endogenous stem cells and their overall contribution to in vivo fracture repair is not well understood. The purpose of this study was to determine the interaction between exogenous and endogenous stem cells during bone healing. This study was conducted using a standardized burr-hole bone injury model in a mesenchymal progenitor cell (MPC) lineage-tracing mouse under normal homeostatic and osteoporotic conditions. Burr-hole injuries were treated with a collagen-I biomaterial loaded with and without labelled induced pluripotent stem cells (iPSCs). Using lineage-tracing, the roles of exogenous and endogenous stem cells during bone healing were examined. It was observed that treatment with iPSCs resulted in muted healing compared to untreated controls in intact mice post-injury. When the cell populations were examined histologically, iPSC-treated burr-hole defects presented with a dramatic reduction in endogenous MPCs and cell proliferation throughout the injury site. However, when the ovaries were removed and an osteoporotic-like phenotype induced in the mice, iPSCs treatment resulted in increased bone formation relative to untreated controls. In the absence of iPSCs, endogenous MPCs demonstrated robust proliferative and osteogenic capacity to undertake repair and this behaviour was disrupted in the presence of iPSCs which instead took on an osteoblast fate but with little proliferation. This study clearly demonstrates that exogenously delivered cell populations can impact the normal function of endogenous stem/progenitor populations during the normal healing cascade. These interactions need to be better understood to inform cell and biomaterial therapies to treat fractures.
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Affiliation(s)
- Leah Ferrie
- McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, AB, Canada
- Biomedical Engineering Graduate Program, University of Calgary, Calgary, AB, Canada
| | - Priyatha Premnath
- McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, AB, Canada
- College of Engineering and Applied Science, University of Wisconsin Milwaukee, Milwaukee, WI, USA
| | - Alexandra Olsen
- McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, AB, Canada
- Biomedical Engineering Graduate Program, University of Calgary, Calgary, AB, Canada
| | - Leila Larijani
- McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, AB, Canada
- Department of Biochemistry and Molecular Biology, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Bryce A Besler
- McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, AB, Canada
- Biomedical Engineering Graduate Program, University of Calgary, Calgary, AB, Canada
| | - Derrick E Rancourt
- McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, AB, Canada
- Biomedical Engineering Graduate Program, University of Calgary, Calgary, AB, Canada
- Department of Biochemistry and Molecular Biology, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada
| | - Neil A Duncan
- McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, AB, Canada
- Biomedical Engineering Graduate Program, University of Calgary, Calgary, AB, Canada
- Department of Civil Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB, Canada
| | - T Michael Underhill
- Department of Cellular and Physiological Sciences, University of British Columbia, Vancouver, BC, Canada
| | - Roman J Krawetz
- McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, AB, Canada.
- Biomedical Engineering Graduate Program, University of Calgary, Calgary, AB, Canada.
- Department of Cell Biology and Anatomy, Cumming School of Medicine, University of Calgary, Calgary, AB, Canada.
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Evaluating the Degradation Process of Collagen Sponge and Acellular Matrix Implants In Vivo Using the Standardized HPLC-MS/MS Method. SEPARATIONS 2023. [DOI: 10.3390/separations10010047] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
The purpose of this study was to establish a collagen determination method based on an isotope-labeled collagen peptide as an internal reference via high-performance liquid chromatography–tandem mass spectrometry (HPLC–MS/MS), and using the established method to evaluate the degradation process of collagen-based implants in vivo. The specific peptide (GPAGPQGPR) of bovine type I collagen was identified with an Orbitrap mass spectrometer. Then, the quantification method based on the peptide detection with HPLC-MS/MS was established and validated, and then further used to analyze the degradation trend of the collagen sponge and acellular matrix (ACM) in vivo at 2, 4, 6, 8, 12, 16, and 18 weeks after implantation. The results indicate that the relative standard deviation (RSD) of the detection precision and repeatability of the peptide-based HPLC-MS/MS quantification method were 3.55% and 0.63%, respectively. The limitations of quantification and detection were 2.05 × 10−3 μg/mL and 1.12 × 10−3 μg/mL, respectively. The collagen sponge and ACM were completely degraded at 10 weeks and 18 weeks, respectively. Conclusion: A specific peptide (GPAGPQGPR) of bovine type I collagen was identified with an Orbitrap mass spectrometer, and a standardized HPLC-MS/MS-based internal reference method for the quantification of bovine type I collagen was established. The method can be used for the analysis of the degradation of collagen-based implants in vivo.
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Evaluation of the osteoinductive potential of HDPSCs cultured on β-glycerol phosphate functionalized MWCNTs/PCL membranes for bone regeneration. Polym Bull (Berl) 2022. [DOI: 10.1007/s00289-021-03721-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Nanofibrous Gelatin-Based Biomaterial with Improved Biomimicry Using D-Periodic Self-Assembled Atelocollagen. Biomimetics (Basel) 2021; 6:biomimetics6010020. [PMID: 33803778 PMCID: PMC8006151 DOI: 10.3390/biomimetics6010020] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 03/12/2021] [Accepted: 03/15/2021] [Indexed: 01/14/2023] Open
Abstract
Design of bioinspired materials that mimic the extracellular matrix (ECM) at the nanoscale is a challenge in tissue engineering. While nanofibrillar gelatin materials mimic chemical composition and nano-architecture of natural ECM collagen components, it lacks the characteristic D-staggered array (D-periodicity) of 67 nm, which is an important cue in terms of cell recognition and adhesion properties. In this study, a nanofibrous gelatin matrix with improved biomimicry is achieved using a formulation including a minimal content of D-periodic self-assembled atelocollagen. We suggest a processing route approach consisting of the thermally induced phase separation of the gelatin based biopolymeric mixture precursor followed by chemical-free material cross-linking. The matrix nanostructure is characterized using field emission gun scanning electron microscopy (FEG-SEM), transmission electron microscopy (TEM), wide angle X-ray diffraction (XRD) and Fourier-transform infrared spectroscopy (FT-IR). The cell culture assays indicate that incorporation of 2.6 wt.% content of D-periodic atelocollagen to the gelatin material, produces a significant increase of MC3T3-E1 mouse preosteoblast cells attachment and human mesenchymal stem cells (hMSCs) proliferation, in comparison with related bare gelatin matrices. The presented results demonstrate the achievement of an efficient route to produce a cost-effective, compositionally defined and low immunogenic “collagen-like” instructive biomaterial, based on gelatin.
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Tang SW, Tong WY, Pang SW, Voelcker NH, Lam YW. Deconstructing, Replicating, and Engineering Tissue Microenvironment for Stem Cell Differentiation. TISSUE ENGINEERING PART B-REVIEWS 2020; 26:540-554. [PMID: 32242476 DOI: 10.1089/ten.teb.2020.0044] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
One of the most crucial components of regenerative medicine is the controlled differentiation of embryonic or adult stem cells into the desired cell lineage. Although most of the reported protocols of stem cell differentiation involve the use of soluble growth factors, it is increasingly evident that stem cells also undergo differentiation when cultured in the appropriate microenvironment. When cultured in decellularized tissues, for instance, stem cells can recapitulate the morphogenesis and functional specialization of differentiated cell types with speed and efficiency that often surpass the traditional growth factor-driven protocols. This suggests that the tissue microenvironment (TME) provides stem cells with a holistic "instructive niche" that harbors signals for cellular reprogramming. The translation of this into medical applications requires the decoding of these signals, but this has been hampered by the complexity of TME. This problem is often addressed by a reductionist approach, in which cells are exposed to substrates decorated with simple, empirically designed geometries, textures, and chemical compositions ("bottom-up" approach). Although these studies are invaluable in revealing the basic principles of mechanotransduction mechanisms, their physiological relevance is often uncertain. This review examines the recent progress of an alternative, "top-down" approach, in which the TME is treated as a holistic biological entity. This approach is made possible by recent advances in systems biology and fabrication technologies that enable the isolation, characterization, and reconstitution of TME. It is hoped that these new techniques will elucidate the nature of niche signals so that they can be extracted, replicated, and controlled. This review summarizes these emerging techniques and how the data they generated are changing our view on TME. Impact statement This review summarizes the current state of art of the understanding of instructive niche in the field of tissue microenvironment. Not only did we survey the use of different biochemical preparations as stimuli of stem cell differentiation and summarize the recent effort in dissecting the biochemical composition of these preparations, through the application of extracellular matrix (ECM) arrays and proteomics, but we also introduce the use of open-source, high-content immunohistochemistry projects in contributing to the understanding of tissue-specific composition of ECM. We believe this review would be highly useful for our peer researching in the same field. "Mr. Tulkinghorn is always the same… so oddly out of place and yet so perfectly at home." -Charles Dickens, Bleak House.
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Affiliation(s)
- Sze Wing Tang
- Department of Chemistry, City University of Hong Kong, Hong Kong, Hong Kong
| | - Wing Yin Tong
- Melbourne Center for Nanofabrication, Victorian Node of the Australian National Fabrication, Clayton, Australia.,Drug Delivery Disposition & Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, Melbourne, Australia
| | - Stella W Pang
- Department of Electrical Engineering, City University of Hong Kong, Hong Kong, Hong Kong
| | - Nicolas H Voelcker
- Melbourne Center for Nanofabrication, Victorian Node of the Australian National Fabrication, Clayton, Australia.,Drug Delivery Disposition & Dynamics, Monash Institute of Pharmaceutical Sciences, Monash University, Melbourne, Australia
| | - Yun Wah Lam
- Department of Chemistry, City University of Hong Kong, Hong Kong, Hong Kong
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Lee PS, Hess R, Friedrichs J, Haenchen V, Eckert H, Cuniberti G, Rancourt D, Krawetz R, Hintze V, Gelinsky M, Scharnweber D. Recapitulating bone development events in a customised bioreactor through interplay of oxygen tension, medium pH, and systematic differentiation approaches. J Tissue Eng Regen Med 2019; 13:1672-1684. [PMID: 31250556 DOI: 10.1002/term.2921] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Revised: 12/12/2018] [Accepted: 02/13/2019] [Indexed: 11/08/2022]
Abstract
Bone development and homeostasis are intricate processes that require co-existence and dynamic interactions among multiple cell types. However, controlled dynamic niches that derive and support stable propagation of these cells from single stem cell source is not sustainable in conventional culturing vessels. In bioreactor cultures that support dynamic niches, the limited source and stability of growth factors are often a major limiting factor for long-term in vitro cultures. Hence, alternative growth factor-free differentiation approaches are designed and their efficacy to achieve different osteochondral cell types is investigated. Briefly, a dynamic niche is achieved by varying medium pH, oxygen tension (pO2 ) distribution in bioreactor, initiating chondrogenic differentiation with chondroitin sulphate A (CSA), and implementing systematic differentiation regimes. In this study, we demonstrated that CSA is a potent chondrogenic inducer, specifically in combination with acidic medium and low pO2 . Further, endochondral ossification is recapitulated through a systematic chondrogenic-osteogenic (ch-os) differentiation regime, and multiple osteochondral cell types are derived. Chondrogenic hypertrophy was also enhanced specifically in high pO2 regions. Consequently, mineralised constructs with higher structural integrity, volume, and tailored dimensions are achieved. In contrast, a continuous osteogenic differentiation regime (os-os) has derived compact and dense constructs, whereas a continuous chondrogenic differentiation regime (ch-ch) has attenuated construct mineralisation and impaired development. In conclusion, a growth factor-free differentiation approach is achieved through interplay of pO2 , medium pH, and systematic differentiation regimes. The controlled dynamic niches have recapitulated endochondral ossification and can potentially be exploited to derive larger bone constructs with near physiological properties.
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Affiliation(s)
- Poh Soo Lee
- Institute for Materials Science, Max Bergmann Center of Biomaterials, Technische Universität Dresden, Dresden, Germany
| | - Ricarda Hess
- Institute for Materials Science, Max Bergmann Center of Biomaterials, Technische Universität Dresden, Dresden, Germany
| | - Jens Friedrichs
- Leibniz Institute of Polymer Research Dresden e. V., Dresden, Germany
| | - Vanessa Haenchen
- Institute for Materials Science, Max Bergmann Center of Biomaterials, Technische Universität Dresden, Dresden, Germany.,Department of Pediatrics, Medizinische Fakultät Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Hagen Eckert
- Institute for Materials Science, Max Bergmann Center of Biomaterials, Technische Universität Dresden, Dresden, Germany.,Dresden Center for Computational Materials Science (DCMS), Technische Universität Dresden, Dresden, Germany
| | - Gianaurelio Cuniberti
- Institute for Materials Science, Max Bergmann Center of Biomaterials, Technische Universität Dresden, Dresden, Germany.,Dresden Center for Computational Materials Science (DCMS), Technische Universität Dresden, Dresden, Germany
| | - Derrick Rancourt
- Department of Cell Biology and Anatomy, Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Roman Krawetz
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Vera Hintze
- Institute for Materials Science, Max Bergmann Center of Biomaterials, Technische Universität Dresden, Dresden, Germany
| | - Michael Gelinsky
- Center for Translational Bone, Joint and Soft Tissue Research, Technische Universität Dresden, Dresden, Germany
| | - Dieter Scharnweber
- Institute for Materials Science, Max Bergmann Center of Biomaterials, Technische Universität Dresden, Dresden, Germany
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Lee PS, Eckert H, Hess R, Gelinsky M, Rancourt D, Krawetz R, Cuniberti G, Scharnweber D. Developing a Customized Perfusion Bioreactor Prototype with Controlled Positional Variability in Oxygen Partial Pressure for Bone and Cartilage Tissue Engineering. Tissue Eng Part C Methods 2018; 23:286-297. [PMID: 28401793 DOI: 10.1089/ten.tec.2016.0244] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Skeletal development is a multistep process that involves the complex interplay of multiple cell types at different stages of development. Besides biochemical and physical cues, oxygen tension also plays a pivotal role in influencing cell fate during skeletal development. At physiological conditions, bone cells generally reside in a relatively oxygenated environment whereas chondrocytes reside in a hypoxic environment. However, it is technically challenging to achieve such defined, yet diverse oxygen distribution on traditional in vitro cultivation platforms. Instead, engineered osteochondral constructs are commonly cultivated in a homogeneous, stable environment. In this study, we describe a customized perfusion bioreactor having stable positional variability in oxygen tension at defined regions. Further, engineered collagen constructs were coaxed into adopting the shape and dimensions of defined cultivation platforms that were precasted in 1.5% agarose bedding. After cultivating murine embryonic stem cells that were embedded in collagen constructs for 50 days, mineralized constructs of specific dimensions and a stable structural integrity were achieved. The end-products, specifically constructs cultivated without chondroitin sulfate A (CSA), showed a significant increase in mechanical stiffness compared with their initial gel-like constructs. More importantly, the localization of osteochondral cell types was specific and corresponded to the oxygen tension gradient generated in the bioreactor. In addition, CSA in complementary with low oxygen tension was also found to be a potent inducer of chondrogenesis in this system. In summary, we have demonstrated a customized perfusion bioreactor prototype that is capable of generating a more dynamic, yet specific cultivation environment that could support propagation of multiple osteochondral lineages within a single engineered construct in vitro. Our system opens up new possibilities for in vitro research on human skeletal development.
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Affiliation(s)
- Poh Soo Lee
- 1 Institute for Materials Science and Max Bergmann Center of Biomaterials, Technische Universität Dresden , Dresden, Germany
| | - Hagen Eckert
- 1 Institute for Materials Science and Max Bergmann Center of Biomaterials, Technische Universität Dresden , Dresden, Germany .,2 Dresden Center for Computational Materials Science (DCMS), Technische Universität Dresden , Dresden, Germany
| | - Ricarda Hess
- 1 Institute for Materials Science and Max Bergmann Center of Biomaterials, Technische Universität Dresden , Dresden, Germany
| | - Michael Gelinsky
- 3 Center for Translational Bone, Joint and Soft Tissue Research, Technische Universität Dresden , Dresden, Germany
| | - Derrick Rancourt
- 4 Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Calgary , Calgary, Canada
| | - Roman Krawetz
- 5 Department of Cell Biology and Anatomy, Faculty of Medicine, University of Calgary , Calgary, Canada
| | - Gianaurelio Cuniberti
- 1 Institute for Materials Science and Max Bergmann Center of Biomaterials, Technische Universität Dresden , Dresden, Germany .,2 Dresden Center for Computational Materials Science (DCMS), Technische Universität Dresden , Dresden, Germany
| | - Dieter Scharnweber
- 1 Institute for Materials Science and Max Bergmann Center of Biomaterials, Technische Universität Dresden , Dresden, Germany
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Hazenbiller O, Nasr S, Krawetz RJ, Duncan NA. Effect of mechanical strain on the pluripotency of murine embryonic stem cells seeded in a collagen-I scaffold. J Orthop Res 2018; 36:799-807. [PMID: 28976591 DOI: 10.1002/jor.23749] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Accepted: 09/22/2017] [Indexed: 02/04/2023]
Abstract
The use of embryonic stem cells (ESC) in regenerative medicine is restricted due to the possibility of tumorigenicity after inefficient or incomplete differentiation. Studies from our group, and others, suggest that mechanical stimuli may have a suppressive effect on the pluripotency/tumorigenesis of murine ESC (mESC). Furthermore, we have demonstrated that mESC seeded in a type I collagen scaffold, and transplanted into a murine bone fracture model, demonstrated repair without tumor formation. However, it remains unknown if mechanical factors were involved in blocking tumorigenicity of the mESC. Therefore, the aims of the current study were: (i) to characterize the mechanical environment within the transplanted construct (mESC-Col I) in an in vivo murine fracture model using computational analyses; and (ii) to reproduce this mechanical environment in vitro to elucidate the role of these mechanical factors on mESC pluripotent gene expression. It was predicted that the mESC-Col I construct was subjected to an average octahedral shear strain of ∼3.8% and a compressive strain of ∼3.1% within the fracture in vivo when the murine tibia was subjected to an axial compression load of 4 N (1 Hz). When a similar strain environment was replicated experimentally in vitro, the expression patterns of marker genes for pluripotency (Oct 4, Sox 2, Nanog, Rex 1, and oncogene ERas) were significantly down-regulated. This suggests that the local micro-mechanical environment within the fracture site in vivo may be involved in regulating stem cell fate after transplantation, and that these physical factors should be considered when developing regenerative medicine strategies. © 2017 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 36:799-807, 2018.
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Affiliation(s)
- Olesja Hazenbiller
- Biomedical Engineering Graduate Program, McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, Alberta, Canada
| | - Saghar Nasr
- Department of Mechanical and Manufacturing Engineering, Schulich School of Engineering, McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, Alberta, Canada
| | - Roman J Krawetz
- Department of Cell Biology and Anatomy, Cumming School of Medicine, McCaig Institute for Bone and Joint Health, University of Calgary, Calgary, Alberta, Canada
| | - Neil A Duncan
- Departments of Civil Engineering, Schulich School of Engineering, McCaig Institute for Bone and Joint Health, University of Calgary, 2500 University Drive N.W., Calgary, Alberta, T2N 1N4, Canada
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9
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Reduction of pluripotent gene expression in murine embryonic stem cells exposed to mechanical loading or Cyclo RGD peptide. BMC Cell Biol 2017; 18:32. [PMID: 29137597 PMCID: PMC5686896 DOI: 10.1186/s12860-017-0148-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Accepted: 11/01/2017] [Indexed: 11/10/2022] Open
Abstract
Background Self-renewal and differentiation of embryonic stem cells (ESCs) is directed by biological and/or physical cues that regulate multiple signaling cascades. We have previously shown that mESCs seeded in a type I collagen matrix demonstrate a loss of pluripotent marker expression and differentiate towards an osteogenic lineage. In this study, we examined if this effect was mediated in part through Arginylglycylaspartic acid (RGD) dependent integrin activity and/or mechano-transduction. Results The results from this study suggest that mESC interaction with the local microenvironment through RGD dependent integrins play a role in the regulation of mESC core transcription factors (TF), Oct-4, Sox 2 and Nanog. Disruption of this interaction with a cyclic RGD peptide (cRGDfC) was sufficient to mimic the effect of a mechanical stimulus in terms of pluripotent gene expression, specifically, we observed that supplementation with cRGDfC, or mechanical stimulus, significantly influenced mESC pluripotency by down-regulating core transcription factors. Moreover, our results indicated that the presence of the cRGDfC peptide inhibited integrin expression and up-regulated early lineage markers (mesoderm and ectoderm) in a Leukemia inhibitory factor (LIF) dependent manner. When cRGDfC treated mESCs were injected in Severe combined immunodeficiency (SCID) mice, no tissue growth and/or teratoma formation was observed, suggesting that the process of mESC tumor formation in vivo is potentially dependent on integrin interaction. Conclusions Overall, the disruption of cell-integrin interaction via cRGDfC peptide can mimic the effect of mechanical stimulation on mESC pluripotency gene expression and also inhibit the tumorigenic potential of mESCs in vivo.
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10
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A Comparative Evaluation of the Mechanical Properties of Two Calcium Phosphate/Collagen Composite Materials and Their Osteogenic Effects on Adipose-Derived Stem Cells. Stem Cells Int 2016; 2016:6409546. [PMID: 27239204 PMCID: PMC4864572 DOI: 10.1155/2016/6409546] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Revised: 02/28/2016] [Accepted: 04/04/2016] [Indexed: 11/18/2022] Open
Abstract
Adipose-derived stem cells (ADSCs) are ideal seed cells for use in bone tissue engineering and they have many advantages over other stem cells. In this study, two kinds of calcium phosphate/collagen composite scaffolds were prepared and their effects on the proliferation and osteogenic differentiation of ADSCs were investigated. The hydroxyapatite/β-tricalcium phosphate (HA/β-TCP) composite scaffolds (HTPSs), which have an additional β-tricalcium phosphate, resulted in better proliferation of ADSCs and showed osteogenesis-promoting effects. Therefore, such composite scaffolds, in combination with ADSCs or on their own, would be promising for use in bone regeneration and potential clinical therapy for bone defects.
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11
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Damaraju S, Matyas JR, Rancourt DE, Duncan NA. The effect of mechanical stimulation on mineralization in differentiating osteoblasts in collagen-I scaffolds. Tissue Eng Part A 2015; 20:3142-53. [PMID: 24851936 DOI: 10.1089/ten.tea.2014.0026] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Developing a viable and functional bone scaffold in vitro that is capable of surviving and bearing mechanical load in vivo requires an understanding of the cell biology of osteoprogenitor cells, particularly how they are influenced by mechanical stimulation during cell differentiation and maturation. In this study, mechanical load was applied using a modified FlexCell plate to impart confined compression to collagen-I scaffolds seeded with undifferentiated murine embryonic stem cells. The activity, presence, and expression of osteoblast-cadherin (OB-Cad) and connexin-43, as well as various pluripotent and osteogenic markers were examined at 5-30 days of differentiation as cells were stimulated to differentiate to osteoblasts with and without applied mechanical load. Fluorescence recovery after photobleaching, immunofluorescence, viability, von Kossa, and real-time polymerase chain reaction assessments revealed that mechanical prestimulation of this cell-seeded scaffold altered the expression of OB-Cad and connexin-43 and resulted in significant differences in the structure and organization of mineralization present in the collagen matrix. Specifically, cells in gels that were loaded for 40 h after 5 days of differentiation and then left to fully differentiate for 30 days produced a highly structured honeycomb-shaped mineralization in the matrix; an outcome that was previously shown to be indicative of late osteoblast/early osteocyte activity. This study highlights the potential of mechanical load to accelerate differentiation and enhance osteoblast communication and function during the differentiation process, and highlights a time point of cell differentiation within this scaffold to apply load in order to most effectively transduce a mechanical signal.
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Affiliation(s)
- Swathi Damaraju
- 1 Biomedical Engineering Program, McCaig Institute for Bone and Joint Health, University of Calgary , Calgary, Alberta, Canada
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12
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Gamie Z, MacFarlane RJ, Tomkinson A, Moniakis A, Tran GT, Gamie Y, Mantalaris A, Tsiridis E. Skeletal tissue engineering using mesenchymal or embryonic stem cells: clinical and experimental data. Expert Opin Biol Ther 2015; 14:1611-39. [PMID: 25303322 DOI: 10.1517/14712598.2014.945414] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
INTRODUCTION Mesenchymal stem cells (MSCs) can be obtained from a wide variety of tissues for bone tissue engineering such as bone marrow, adipose, birth-associated, peripheral blood, periosteum, dental and muscle. MSCs from human fetal bone marrow and embryonic stem cells (ESCs) are also promising cell sources. AREAS COVERED In vitro, in vivo and clinical evidence was collected using MEDLINE® (1950 to January 2014), EMBASE (1980 to January 2014) and Google Scholar (1980 to January 2014) databases. EXPERT OPINION Enhanced results have been found when combining bone marrow-derived mesenchymal stem cells (BMMSCs) with recently developed scaffolds such as glass ceramics and starch-based polymeric scaffolds. Preclinical studies investigating adipose tissue-derived stem cells and umbilical cord tissue-derived stem cells suggest that they are likely to become promising alternatives. Stem cells derived from periosteum and dental tissues such as the periodontal ligament have an osteogenic potential similar to BMMSCs. Stem cells from human fetal bone marrow have demonstrated superior proliferation and osteogenic differentiation than perinatal and postnatal tissues. Despite ethical concerns and potential for teratoma formation, developments have also been made for the use of ESCs in terms of culture and ideal scaffold.
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Affiliation(s)
- Zakareya Gamie
- Aristotle University Medical School, 'PapaGeorgiou' Hospital, Academic Orthopaedic Unit , Thessaloniki , Greece
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Won JE, Yun YR, Jang JH, Yang SH, Kim JH, Chrzanowski W, Wall IB, Knowles JC, Kim HW. Multifunctional and stable bone mimic proteinaceous matrix for bone tissue engineering. Biomaterials 2015; 56:46-57. [DOI: 10.1016/j.biomaterials.2015.03.022] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2015] [Accepted: 03/15/2015] [Indexed: 11/16/2022]
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14
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Damaraju S, Matyas JR, Rancourt DE, Duncan NA. The role of gap junctions and mechanical loading on mineral formation in a collagen-I scaffold seeded with osteoprogenitor cells. Tissue Eng Part A 2015; 21:1720-32. [PMID: 25752490 DOI: 10.1089/ten.tea.2014.0522] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Fracture nonunions represent one of many large bone defects where current treatment strategies fall short in restoring both form and function of the injured tissue. In this case, the use of a tissue-engineered scaffold for promoting bone healing offers an accessible and easy-to-manipulate environment for studying bone formation processes in vitro. We have previously shown that mechanical prestimulation using confined compression of differentiating osteoblasts results in an increase in mineralization formed in a 3D collagen-I scaffold. This study builds on this knowledge by evaluating the short and long-term effects of blocking gap junction-mediated intercellular communication among osteogenic cells on their effectiveness to mineralize collagen-I scaffolds in vitro, and in the presence and absence of mechanical stimulation. In this study, confined compression was applied in conjunction with octanol (a general communication blocker) or 18-α-glycerrhetinic acid (AGA, a specific gap junction blocker) using a modified FlexCell plate to collagen-I scaffolds seeded with murine embryonic stem cells stimulated toward osteoblast differentiation using beta-glycerol phosphate. The activity, presence, and expression of osteoblast cadherin, connexin-43, as well as various pluripotent and osteogenic markers were examined at 5-30 days of differentiation. Fluorescence recovery after photobleaching, immunofluorescence, viability, histology assessments, and reverse-transcriptase polymerase chain reaction assessments revealed that inhibiting communication in this scaffold altered the lineage and function of differentiating osteoblasts. In particular, treatment with communication inhibitors caused reduced mineralization in the matrix, and dissociation between connexin-43 and integrin α5β1. This dissociation was not restored even after long-term recovery. Thus, in order for this scaffold to be considered as an alternative strategy for the repair of large bone defects, cell-cell contacts and cell-matrix interactions must remain intact for osteoblast differentiation and function to be preserved. This study shows that within this 3D scaffold, gap junctions are essential in osteoblast response to mechanical loading, and are essential structures in producing a significant amount and organization of mineralization in the matrix.
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Affiliation(s)
- Swathi Damaraju
- 1 McCaig Institute for Bone and Joint Health, University of Calgary , Calgary, Canada
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15
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Garcia-Bennett AE, König N, Abrahamsson N, Kozhevnikova M, Zhou C, Trolle C, Pankratova S, Berezin V, Kozlova EN. In vitro generation of motor neuron precursors from mouse embryonic stem cells using mesoporous nanoparticles. Nanomedicine (Lond) 2014; 9:2457-66. [DOI: 10.2217/nnm.14.23] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Aim: Stem cell-derived motor neurons (MNs) are utilized to develop replacement strategies for spinal cord disorders. Differentiation of embryonic stem cells into MN precursors involves factors and their repeated administration. We investigated if delivery of factors loaded into mesoporous nanoparticles could be effective for stem cell differentiation in vitro. Materials & methods: We used a mouse embryonic stem cell line expressing green fluorescent protein under the promoter for the MN-specific gene Hb9 to visualize the level of MN differentiation. The differentiation of stem cells was evaluated by expression of MN-specific transcription factors monitored by quantitative real-time PCR reactions and immunocytochemistry. Results: Mesoporous nanoparticles have strong affiliation to the embryoid bodies, penetrate inside the embryoid bodies and come in contact with differentiating cells. Conclusion: Repeated administration of soluble factors into a culture medium can be avoided due to a sustained release effect using mesoporous silica. Original submitted 28 August 2013; Revised submitted 23 January 2014
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Affiliation(s)
- Alfonso E Garcia-Bennett
- Department of Materials & Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91, Stockholm, Sweden
| | - Niclas König
- Department of Neuroscience, Uppsala University Biomedical Center, Box 593, SE-751 24, Uppsala, Sweden
| | - Ninnie Abrahamsson
- Department of Neuroscience, Uppsala University Biomedical Center, Box 593, SE-751 24, Uppsala, Sweden
| | - Mariya Kozhevnikova
- Department of Neuroscience, Uppsala University Biomedical Center, Box 593, SE-751 24, Uppsala, Sweden
| | - Chunfang Zhou
- Nanologica AB, Drottning Kristinas väg, 62, SE-114 28, Stockholm, Sweden
| | - Carl Trolle
- Department of Neuroscience, Uppsala University Biomedical Center, Box 593, SE-751 24, Uppsala, Sweden
| | - Stanislava Pankratova
- Laboratory of Neural Plasticity, Department of Neuroscience & Pharmacology, Panum Institute, Copenhagen University, Copenhagen, Denmark
| | - Vladimir Berezin
- Laboratory of Neural Plasticity, Department of Neuroscience & Pharmacology, Panum Institute, Copenhagen University, Copenhagen, Denmark
| | - Elena N Kozlova
- Department of Neuroscience, Uppsala University Biomedical Center, Box 593, SE-751 24, Uppsala, Sweden
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Taiani JT, Buie HR, Campbell GM, Manske SL, Krawetz RJ, Rancourt DE, Boyd SK, Matyas JR. Embryonic stem cell therapy improves bone quality in a model of impaired fracture healing in the mouse; tracked temporally using in vivo micro-CT. Bone 2014; 64:263-72. [PMID: 24780879 DOI: 10.1016/j.bone.2014.04.019] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2013] [Revised: 02/25/2014] [Accepted: 04/17/2014] [Indexed: 01/08/2023]
Abstract
In the current study, we used an estrogen-deficient mouse model of osteoporosis to test the efficacy of a cell-generated bone tissue construct for bone augmentation of an impaired healing fracture. A reduction in new bone formation at the defect site was observed in ovariectomized fractures compared to the control group using repeated measures in vivo micro-computed tomography (μCT) imaging over 4 weeks. A significant increase in the bone mineral density (BMD), trabecular bone volume ratio, and trabecular number, thickness and connectivity were associated with fracture repair in the control group, whereas the fractured bones of the ovariectomized mice exhibited a loss in all of these parameters (p<0.001). In a separate group, ovariectomized fractures were treated with murine embryonic stem (ES) cell-derived osteoblasts loaded in a three-dimensional collagen I gel and recovery of the bone at the defect site was observed. A significant increase in the trabecular bone volume ratio (p<0.001) and trabecular number (p<0.01) was observed by 4 weeks in the fractures treated with cell-loaded collagen matrix compared to those treated with collagen I alone. The stem cell-derived osteoblasts were identified at the fracture site at 4 weeks post-implantation through in situ hybridization histochemistry. Although this cell tracking method was effective, the formation of an ectopic cellular nodule adjacent to the knee joints of two mice suggested that alternative in vivo cell tracking methods should be employed in order to definitively assess migration of the implanted cells. To our knowledge, this study is the first of its kind to examine the efficacy of stem cell therapy for fracture repair in an osteoporosis-related fracture model in vivo. The findings presented provide novel insight into the use of stem cell therapies for bone injuries.
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Affiliation(s)
- J T Taiani
- McCaig Institute for Bone and Joint Health, Faculty of Medicine, University of Calgary, Calgary, AB, T2N 4N1, Canada; Biomedical Engineering Program, University of Calgary, Calgary, AB, T2N 1N4, Canada
| | - H R Buie
- McCaig Institute for Bone and Joint Health, Faculty of Medicine, University of Calgary, Calgary, AB, T2N 4N1, Canada; Schulich School of Engineering, University of Calgary, Calgary, AB, T2N 1N4, Canada
| | - G M Campbell
- McCaig Institute for Bone and Joint Health, Faculty of Medicine, University of Calgary, Calgary, AB, T2N 4N1, Canada; Schulich School of Engineering, University of Calgary, Calgary, AB, T2N 1N4, Canada
| | - S L Manske
- McCaig Institute for Bone and Joint Health, Faculty of Medicine, University of Calgary, Calgary, AB, T2N 4N1, Canada
| | - R J Krawetz
- McCaig Institute for Bone and Joint Health, Faculty of Medicine, University of Calgary, Calgary, AB, T2N 4N1, Canada; Department of Biochemistry and Molecular Biology, University of Calgary, Calgary, AB, T2N 1N4, Canada.
| | - D E Rancourt
- McCaig Institute for Bone and Joint Health, Faculty of Medicine, University of Calgary, Calgary, AB, T2N 4N1, Canada; Department of Biochemistry and Molecular Biology, University of Calgary, Calgary, AB, T2N 1N4, Canada
| | - S K Boyd
- McCaig Institute for Bone and Joint Health, Faculty of Medicine, University of Calgary, Calgary, AB, T2N 4N1, Canada; Schulich School of Engineering, University of Calgary, Calgary, AB, T2N 1N4, Canada
| | - J R Matyas
- McCaig Institute for Bone and Joint Health, Faculty of Medicine, University of Calgary, Calgary, AB, T2N 4N1, Canada; Department of Comparative Biology and Experimental Medicine, University of Calgary, Calgary, AB, T2N 1N4, Canada
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Machula H, Ensley B, Kellar R. Electrospun Tropoelastin for Delivery of Therapeutic Adipose-Derived Stem Cells to Full-Thickness Dermal Wounds. Adv Wound Care (New Rochelle) 2014; 3:367-375. [PMID: 24804156 DOI: 10.1089/wound.2013.0513] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2013] [Accepted: 01/20/2014] [Indexed: 11/12/2022] Open
Abstract
Objective: To evaluate the physiological effects of electrospun tropoelastin scaffolds as therapeutic adipose-derived stem cell (ADSC) delivery vehicles for the treatment of full-thickness dermal wounds. Approach: Using the process of electrospinning, several prototype microfiber scaffolds were created with tropoelastin. Initial testing of scaffold biocompatibility was performed in vitro through ADSC culture, followed by scanning electron microscopy (SEM) for assessment of ADSC attachment, morphology, and new extracellular matrix (ECM) deposition. The wound healing effects of ADSC-seeded scaffolds were then evaluated in a murine dermal excisional wound model. Results: For the in vitro study, SEM revealed exceptional biocompatibility of electrospun tropoelastin for ADSCs. In the wound-healing study, ADSC-treated groups demonstrated significantly enhanced wound closure and epithelial thickness compared to controls. Innovation: This is the first report on the use of tropoelastin-based biomaterials as delivery vehicles for therapeutic ADSCs. Conclusion: We have demonstrated that tropoelastin-based ADSC delivery vehicles significantly accelerate wound healing compared to controls that represent the current clinical standard of care. Furthermore, the unique mechanical and biochemical characteristics of tropoelastin may favor its use over other biological or synthetic scaffolds for the treatment of certain pathologies due to its unique intrinsic mechanical properties.
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Affiliation(s)
- Hans Machula
- Biological Sciences, Northern Arizona University, Flagstaff, Arizona
| | | | - Robert Kellar
- Biological Sciences, Northern Arizona University, Flagstaff, Arizona
- Protein Genomics, Sedona, Arizona
- Development Engineering Sciences, Flagstaff, Arizona
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18
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Hadzir SN, Ibrahim SN, Abdul Wahab RM, Zainol Abidin IZ, Senafi S, Ariffin ZZ, ABDUL RAZAK M, Zainal Ariffin SH. Ascorbic acid induces osteoblast differentiation of human suspension mononuclear cells. Cytotherapy 2014; 16:674-82. [DOI: 10.1016/j.jcyt.2013.07.013] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Accepted: 07/27/2013] [Indexed: 01/19/2023]
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Filion D, Buschmann MD. Chitosan–glycerol-phosphate (GP) gels release freely diffusible GP and possess titratable fixed charge. Carbohydr Polym 2013; 98:813-9. [DOI: 10.1016/j.carbpol.2013.06.055] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2013] [Revised: 04/03/2013] [Accepted: 06/25/2013] [Indexed: 11/28/2022]
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Lomas AJ, Webb WR, Han J, Chen GQ, Sun X, Zhang Z, El Haj AJ, Forsyth NR. Poly (3-hydroxybutyrate-co-3-hydroxyhexanoate)/collagen hybrid scaffolds for tissue engineering applications. Tissue Eng Part C Methods 2013; 19:577-85. [PMID: 23281705 DOI: 10.1089/ten.tec.2012.0457] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
The benefits associated with polyhydroxyalkanoates (PHA) in tissue engineering include high immunotolerance, low toxicity, and biodegradability. Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx), a molecule from the PHA family of biopolymers, shares these features. In this study, the applicability of human embryonic stem cells (hESCs), spontaneously differentiated hESCs (SDhESCs), and mesenchymal stem cells (hMSCs) in conjunction with PHBHHx and collagen as a biocompatible replacement strategy for damaged tissues was exploited. Collagen gel contraction was monitored by seeding cells at controlled densities (0, 10(3), 10(4), and 10(5) cells/mL) and measuring length and diameter at regular time intervals thereafter when cultured in a complete medium. Cell viability was measured by trypan blue exclusion assay. Porous PHBHHx tube scaffolds were prepared using a dipping method followed by salt leaching. PHBHHx/collagen composites were generated via syringe injection of collagen/cell mixtures into sterile PHBHHx porous tubes. Reverse transcription polymerase chain reaction was used to determine the fate of cells within PHBHHx/collagen scaffolds with tendon, bone, cartilage, and fat-linked transcript expression being explored at days 0, 5 10, and 20. The capacity of PHBHHx/collagen scaffolds to support differentiation was explored using a medium specific for osteogenic, chondrogenic, and adipogenic lineage generation. Collagen gel tube contraction required initial seeding densities of ≥10(5) hMSCs or SDhESCs in 1.5 mg/mL collagen gel tubes. Gels with a collagen concentration of 3 mg/mL did not display contraction across the examined cell seeding densities. Cell viability was ∼50% for SDhESC and 90% for hMSCs at all cell densities tested in porous PHBHHx tube/3 mg/mL collagen hybrid scaffolds after 20 days in vitro culture. Undifferentiated hESCs did not contract collagen gel tubes and were unviable after 20 days culture. In the absence of additional stimuli, SOX9 was sporadically found, while RUNX2 was not present in both hMSC and SDhESC. Hybrid scaffolds were shown to promote retention of osteogenic, chondrogenic, and adipogenic differentiation by expression of RUNX2, SOX9, and PPARγ genes, respectively, following exposure to the appropriate induction medium. PHBHHx/collagen scaffolds have been successfully used to culture hMSC and SDhESC over an extended period supporting the potential of this scaffold combination in future tissue engineering applications.
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Affiliation(s)
- Alex J Lomas
- Institute for Science and Technology in Medicine, Keele University, Guy Hilton Research Centre, Stoke-on-Trent, United Kingdom
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21
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Pineda ET, Nerem RM, Ahsan T. Differentiation patterns of embryonic stem cells in two- versus three-dimensional culture. Cells Tissues Organs 2013; 197:399-410. [PMID: 23406658 DOI: 10.1159/000346166] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/26/2012] [Indexed: 11/19/2022] Open
Abstract
Pluripotent stem cells are attractive candidates as a cell source for regenerative medicine and tissue engineering therapies. Current methods of differentiation result in low yields and impure populations of target phenotypes, with attempts for improved efficiency often comparing protocols that vary multiple parameters. This basic science study focused on a single variable to understand the effects of two-dimensional (2D) versus three-dimensional (3D) culture on directed differentiation. We compared mouse embryonic stem cells (ESCs) differentiated on collagen type I-coated surfaces (SLIDEs), embedded in collagen type I gels (GELs), and in suspension as embryoid bodies (EBs). For a systematic analysis in these studies, key parameters were kept identical to allow for direct comparison across culture configurations. We determined that all three configurations supported differentiation of ESCs and that the kinetics of differentiation differed greatly for cells cultured in 2D versus 3D. SLIDE cultures induced overall differentiation more quickly than 3D configurations, with earlier expression of cytoskeletal and extracellular matrix proteins. For 3D culture as GELs or EBs, cells clustered similarly, formed complex structures and promoted differentiation towards cardiovascular phenotypes. GEL culture, however, also allowed for contraction of the collagen matrix. For differentiation towards fibroblasts and smooth muscle cells which actively remodel their environment, GEL culture may be particularly beneficial. Overall, this study determined the effects of dimensionality on differentiation and helps in the rational design of protocols to generate phenotypes needed for tissue engineering and regenerative medicine.
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Affiliation(s)
- Emma T Pineda
- Department of Biomedical Engineering, Tulane University, New Orleans, LA 70118, USA
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Taiani JT, Krawetz RJ, Yamashita A, Pauchard Y, Buie HR, Ponjevic D, Boyd SK, Rancourt DE, Matyas JR. Embryonic stem cells incorporate into newly formed bone and do not form tumors in an immunocompetent mouse fracture model. Cell Transplant 2012; 22:1453-62. [PMID: 23127821 DOI: 10.3727/096368912x658755] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Embryonic stem (ES) cells are a uniquely self-renewing, pluripotent population of cells that must be differentiated before being useful for cell therapy. Since most studies utilize subcutaneous implantation to test the in vivo functionality of ES cell-derived cells, the objective of the current study was to develop an appropriate and clinically relevant in vivo implantation system in which the behavior and tumorigenicity of ES cell-derived cells could be effectively tested in a tissue-specific (orthotopic) site. Male ES cells were differentiated either into osteoblasts or chondrocytes using protocols that were previously developed and published by our laboratory. The differentiated cells were implanted into a burr-hole fracture created in the proximal tibiae of immunocompetent female mice, strain matched to the ES cell line. The ability of the differentiated ES cell-derived cells (bearing the Y chromosome) to incorporate into the newly formed bone was assessed by micro-computed tomography imaging and histochemistry. ES cells differentiated with either osteogenic or chondrogenic medium supplementation formed a soft tissue mass that disrupted the normal bone architecture by 4 weeks after implantation in some mice. In contrast, mice receiving osteoblastic cells that were differentiated in a three-dimensional type 1 collagen gel showed evidence of new bone formation at the defect site without evidence of tumor formation for up to 8 weeks after implantation. In this injury model, type 1 collagen is more effective than medium supplementation at driving more complete differentiation of ES cells, as evidenced by reducing their tumorigenicity. Overall, the current study emphasizes the importance of using an appropriate orthotopic implantation system to effectively test the behavior and tumorigenicity of the cells in vivo.
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Affiliation(s)
- Jaymi T Taiani
- McCaig Institute for Bone and Joint Health, Biomedical Engineering Program, Department of Medical Science, Faculty of Graduate Studies, University of Calgary, Calgary, Alberta, Canada.
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