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Brauer E, Herrera A, Fritsche-Guenther R, Görlitz S, Leemhuis H, Knaus P, Kirwan JA, Duda GN, Petersen A. Mechanical heterogeneity in a soft biomaterial niche controls BMP2 signaling. Biomaterials 2024; 309:122614. [PMID: 38788455 DOI: 10.1016/j.biomaterials.2024.122614] [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: 12/04/2023] [Revised: 05/08/2024] [Accepted: 05/10/2024] [Indexed: 05/26/2024]
Abstract
The extracellular matrix is known to impact cell function during regeneration by modulating growth factor signaling. However, how the mechanical properties and structure of biomaterials can be used to optimize the cellular response to growth factors is widely neglected. Here, we engineered a macroporous biomaterial to study cellular signaling in environments that mimic the mechanical stiffness but also the mechanical heterogeneity of native extracellular matrix. We found that the mechanical interaction of cells with the heterogeneous and non-linear deformation properties of soft matrices (E < 5 kPa) enhances BMP-2 growth factor signaling with high relevance for tissue regeneration. In contrast, this effect is absent in homogeneous hydrogels that are often used to study cell responses to mechanical cues. Live cell imaging and in silico finite element modeling further revealed that a subpopulation of highly active, fast migrating cells is responsible for most of the material deformation, while a second, less active population experiences this deformation as an extrinsic mechanical stimulation. At an overall low cell density, the active cell population dominates the process, suggesting that it plays a particularly important role in early tissue healing scenarios where cells invade tissue defects or implanted biomaterials. Taken together, our findings demonstrate that the mechanical heterogeneity of the natural extracellular matrix environment plays an important role in triggering regeneration by endogenously acting growth factors. This suggests the inclusion of such mechanical complexity as a design parameter in future biomaterials, in addition to established parameters such as mechanical stiffness and stress relaxation.
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Affiliation(s)
- Erik Brauer
- Julius Wolff Institute, Berlin Institute of Health at Charité - Universitätsmedizin Berlin, Germany; Berlin School for Regenerative Therapies, Charité - Universitätsmedizin Berlin, Germany; BIH Center for Regenerative Therapies, Berlin Institute of Health at Charité - Universitätsmedizin Berlin, Germany
| | - Aaron Herrera
- Julius Wolff Institute, Berlin Institute of Health at Charité - Universitätsmedizin Berlin, Germany; Berlin School for Regenerative Therapies, Charité - Universitätsmedizin Berlin, Germany; BIH Center for Regenerative Therapies, Berlin Institute of Health at Charité - Universitätsmedizin Berlin, Germany
| | - Raphaela Fritsche-Guenther
- BIH Metabolomics Platform, Berlin Institute of Health at Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Sophie Görlitz
- Julius Wolff Institute, Berlin Institute of Health at Charité - Universitätsmedizin Berlin, Germany; Berlin School for Regenerative Therapies, Charité - Universitätsmedizin Berlin, Germany; BIH Center for Regenerative Therapies, Berlin Institute of Health at Charité - Universitätsmedizin Berlin, Germany
| | | | - Petra Knaus
- Berlin School for Regenerative Therapies, Charité - Universitätsmedizin Berlin, Germany; Freie Universität Berlin, Institute for Chemistry and Biochemistry, Berlin, Germany
| | - Jennifer A Kirwan
- BIH Metabolomics Platform, Berlin Institute of Health at Charité - Universitätsmedizin Berlin, Berlin, Germany
| | - Georg N Duda
- Julius Wolff Institute, Berlin Institute of Health at Charité - Universitätsmedizin Berlin, Germany; Berlin School for Regenerative Therapies, Charité - Universitätsmedizin Berlin, Germany; BIH Center for Regenerative Therapies, Berlin Institute of Health at Charité - Universitätsmedizin Berlin, Germany
| | - Ansgar Petersen
- Julius Wolff Institute, Berlin Institute of Health at Charité - Universitätsmedizin Berlin, Germany; Berlin School for Regenerative Therapies, Charité - Universitätsmedizin Berlin, Germany; BIH Center for Regenerative Therapies, Berlin Institute of Health at Charité - Universitätsmedizin Berlin, Germany.
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Hong YR, Kim TH, Park KH, Kang J, Lee K, Park EK, Kwon TG, Lim JO, Oh CW. rhBMP-2-Conjugated Three-Dimensional-Printed Poly(L-lactide) Scaffold is an Effective Bone Substitute. Tissue Eng Regen Med 2022; 20:69-81. [PMID: 36512177 PMCID: PMC9852414 DOI: 10.1007/s13770-022-00506-9] [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: 09/27/2022] [Revised: 10/27/2022] [Accepted: 10/30/2022] [Indexed: 12/14/2022] Open
Abstract
BACKGROUND Bone growth factors, particularly bone morphogenic protein-2 (BMP-2), are required for effective treatment of significant bone loss. Despite the extensive development of bone substitutes, much remains to be desired for wider application in clinical settings. The currently available bone substitutes cannot sustain prolonged BMP-2 release and are inconvenient to use. In this study, we developed a ready-to-use bone substitute by sequential conjugation of BMP to a three-dimensional (3D) poly(L-lactide) (PLLA) scaffold using novel molecular adhesive materials that reduced the operation time and sustained prolonged BMP release. METHODS A 3D PLLA scaffold was printed and BMP-2 was conjugated with alginate-catechol and collagen. PLLA scaffolds were conjugated with different concentrations of BMP-2 and evaluated for bone regeneration in vitro and in vivo using a mouse calvarial model. The BMP-2 release kinetics were analyzed using ELISA. Histological analysis and micro-CT image analysis were performed to evaluate new bone formation. RESULTS The 3D structure of the PLLA scaffold had a pore size of 400 µm and grid thickness of 187-230 µm. BMP-2 was released in an initial burst, followed by a sustained release for 14 days. Released BMP-2 maintained osteoinductivity in vitro and in vivo. Micro-computed tomography and histological findings demonstrate that the PLLA scaffold conjugated with 2 µg/ml of BMP-2 induced optimal bone regeneration. CONCLUSION The 3D-printed PLLA scaffold conjugated with BMP-2 enhanced bone regeneration, demonstrating its potential as a novel bone substitute.
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Affiliation(s)
- Yu Ri Hong
- Joint Institute for Regenerative Medicine, Kyungpook National University, Bio-Medical Research Institute, Kyungpook National University Hospital, Daegu, 41940, Republic of Korea
| | - Tae-Ho Kim
- Joint Institute for Regenerative Medicine, Kyungpook National University, Bio-Medical Research Institute, Kyungpook National University Hospital, Daegu, 41940, Republic of Korea
| | - Kyeong-Hyeon Park
- School of Medicine, Kyungpook National University, Daegu, 41944, Republic of Korea
- Department of Orthopedic Surgery, School of Medicine, Kyungpook National University, Kyungpook National University Hospital, Daegu, 41944, Republic of Korea
| | - Jumi Kang
- Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Kyueui Lee
- Department of Chemistry and Green-Nano Materials Research Center, Kyungpook National University, Daegu, 41566, Republic of Korea
| | - Eui Kyun Park
- Department of Oral Pathology and Regenerative Medicine, School of Dentistry, Kyungpook National University, Daegu, 41940, Republic of Korea
| | - Tae-Geon Kwon
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Kyungpook National University, Daegu, 41940, Republic of Korea
| | - Jeong Ok Lim
- Joint Institute for Regenerative Medicine, Kyungpook National University, Bio-Medical Research Institute, Kyungpook National University Hospital, Daegu, 41940, Republic of Korea.
- School of Medicine, Kyungpook National University, Daegu, 41944, Republic of Korea.
| | - Chang-Wug Oh
- Department of Orthopedic Surgery, School of Medicine, Kyungpook National University, Kyungpook National University Hospital, Daegu, 41944, Republic of Korea.
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Kumari S, Katiyar S, Darshna, Anand A, Singh D, Singh BN, Mallick SP, Mishra A, Srivastava P. Design strategies for composite matrix and multifunctional polymeric scaffolds with enhanced bioactivity for bone tissue engineering. Front Chem 2022; 10:1051678. [PMID: 36518978 PMCID: PMC9742444 DOI: 10.3389/fchem.2022.1051678] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Accepted: 11/14/2022] [Indexed: 09/19/2023] Open
Abstract
Over the past few decades, various bioactive material-based scaffolds were investigated and researchers across the globe are actively involved in establishing a potential state-of-the-art for bone tissue engineering applications, wherein several disciplines like clinical medicine, materials science, and biotechnology are involved. The present review article's main aim is to focus on repairing and restoring bone tissue defects by enhancing the bioactivity of fabricated bone tissue scaffolds and providing a suitable microenvironment for the bone cells to fasten the healing process. It deals with the various surface modification strategies and smart composite materials development that are involved in the treatment of bone tissue defects. Orthopaedic researchers and clinicians constantly focus on developing strategies that can naturally imitate not only the bone tissue architecture but also its functional properties to modulate cellular behaviour to facilitate bridging, callus formation and osteogenesis at critical bone defects. This review summarizes the currently available polymeric composite matrices and the methods to improve their bioactivity for bone tissue regeneration effectively.
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Affiliation(s)
- Shikha Kumari
- School of Biochemical Engineering, IIT BHU, Varanasi, India
| | - Soumya Katiyar
- School of Biochemical Engineering, IIT BHU, Varanasi, India
| | - Darshna
- School of Biochemical Engineering, IIT BHU, Varanasi, India
| | - Aditya Anand
- School of Biochemical Engineering, IIT BHU, Varanasi, India
| | - Divakar Singh
- School of Biochemical Engineering, IIT BHU, Varanasi, India
| | - Bhisham Narayan Singh
- Department of Ageing Research, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, Karnataka, India
| | - Sarada Prasanna Mallick
- Department of Biotechnology, Koneru Lakshmaiah Education Foundation, Vaddeswaram, Andhra Pradesh, India
| | - Abha Mishra
- School of Biochemical Engineering, IIT BHU, Varanasi, India
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Chen J, Zhou X, Sun W, Zhang Z, Teng W, Wang F, Sun H, Zhang W, Wang J, Yu X, Ye Z, Li W. Vascular Derived ECM Improves Therapeutic Index of BMP-2 and Drives Vascularized Bone Regeneration. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 18:e2107991. [PMID: 35218305 DOI: 10.1002/smll.202107991] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Revised: 01/31/2022] [Indexed: 06/14/2023]
Abstract
Vascularized osteogenesis is essential for successful bone regeneration, yet its realization during large size bone defect healing remains challenging due to the difficulty to couple multiple biological processes. Herein, harnessing the intrinsic angiogenic potential of vascular derived extracellular matrix (vECM) and its specific affinity to growth factors, a vECM/GelMA based hybrid hydrogel delivery system is constructed to achieve optimized bone morphogenetic protein-2 (BMP-2) therapeutic index and provide intrinsic angiogenic induction during bone healing. The incorporation of vECM not only effectively regulates BMP-2 kinetics to match the bone healing timeframe, but also promotes angiogenesis both in vitro and in vivo. In vivo results also show that vECM-mediated BMP-2 release remarkably enhances vascularized bone formation for critical size bone defects. In particular, blood vessel ingrowth stained with CD31 marker in the defect area is substantially encouraged over the course of healing, suggesting incorporation of vECM served roles in both angiogenesis and osteogenesis. Thus, the authors' study exemplifies that affinity of growth factor towards ECM may be a promising strategy to be leveraged to develop sophisticated delivery systems endowed with desirable properties for regenerative medicine applications.
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Affiliation(s)
- Jiayu Chen
- Department of Orthopedic Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang Province, 310000, P. R. China
- Orthopedics Research Institute of Zhejiang University, Hangzhou, Zhejiang Province, 310000, P. R. China
- Key Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang Province, Hangzhou, Zhejiang Province, 310000, P. R. China
| | - Xingzhi Zhou
- Department of Orthopedic Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang Province, 310000, P. R. China
- Orthopedics Research Institute of Zhejiang University, Hangzhou, Zhejiang Province, 310000, P. R. China
- Key Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang Province, Hangzhou, Zhejiang Province, 310000, P. R. China
| | - Wenquan Sun
- School of Medical and Food, University of Shanghai for Science and Technology, Shanghai, 201210, P. R. China
| | - Zengjie Zhang
- Department of Orthopedic Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang Province, 310000, P. R. China
- Orthopedics Research Institute of Zhejiang University, Hangzhou, Zhejiang Province, 310000, P. R. China
- Key Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang Province, Hangzhou, Zhejiang Province, 310000, P. R. China
| | - Wangsiyuan Teng
- Department of Orthopedic Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang Province, 310000, P. R. China
- Orthopedics Research Institute of Zhejiang University, Hangzhou, Zhejiang Province, 310000, P. R. China
- Key Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang Province, Hangzhou, Zhejiang Province, 310000, P. R. China
| | - Fangqian Wang
- Department of Orthopedic Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang Province, 310000, P. R. China
- Orthopedics Research Institute of Zhejiang University, Hangzhou, Zhejiang Province, 310000, P. R. China
- Key Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang Province, Hangzhou, Zhejiang Province, 310000, P. R. China
| | - Hangxiang Sun
- Department of Orthopedic Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang Province, 310000, P. R. China
- Orthopedics Research Institute of Zhejiang University, Hangzhou, Zhejiang Province, 310000, P. R. China
- Key Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang Province, Hangzhou, Zhejiang Province, 310000, P. R. China
| | - Wei Zhang
- Department of Orthopedic Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang Province, 310000, P. R. China
- Orthopedics Research Institute of Zhejiang University, Hangzhou, Zhejiang Province, 310000, P. R. China
- Key Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang Province, Hangzhou, Zhejiang Province, 310000, P. R. China
| | - Jianwei Wang
- Department of Orthopedic Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang Province, 310000, P. R. China
- Orthopedics Research Institute of Zhejiang University, Hangzhou, Zhejiang Province, 310000, P. R. China
- Key Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang Province, Hangzhou, Zhejiang Province, 310000, P. R. China
| | - Xiaohua Yu
- Department of Orthopedic Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang Province, 310000, P. R. China
- Orthopedics Research Institute of Zhejiang University, Hangzhou, Zhejiang Province, 310000, P. R. China
- Key Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang Province, Hangzhou, Zhejiang Province, 310000, P. R. China
| | - Zhaoming Ye
- Department of Orthopedic Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang Province, 310000, P. R. China
- Orthopedics Research Institute of Zhejiang University, Hangzhou, Zhejiang Province, 310000, P. R. China
- Key Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang Province, Hangzhou, Zhejiang Province, 310000, P. R. China
| | - Weixu Li
- Department of Orthopedic Surgery, The Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, Zhejiang Province, 310000, P. R. China
- Orthopedics Research Institute of Zhejiang University, Hangzhou, Zhejiang Province, 310000, P. R. China
- Key Laboratory of Motor System Disease Research and Precision Therapy of Zhejiang Province, Hangzhou, Zhejiang Province, 310000, P. R. China
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Gruber SMS, Murab S, Ghosh P, Whitlock PW, Lin CYJ. Direct 3D printing of decellularized matrix embedded composite polycaprolactone scaffolds for cartilage regeneration. BIOMATERIALS ADVANCES 2022; 140:213052. [PMID: 35930819 DOI: 10.1016/j.bioadv.2022.213052] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 06/25/2022] [Accepted: 07/25/2022] [Indexed: 06/15/2023]
Abstract
Treatment options for large osteochondral injuries (OCIs) are limited by donor tissue scarcity, morbidity, and anatomic mismatch. 3D printing technology can produce patient-specific scaffolds to address these large defects. Thermoplastics like polycaprolactone (PCL) offer necessary mechanical properties, but lack bioactivity. We fabricated 3D printed PCL scaffolds embedded with polylactic acid microspheres containing decellularized cartilage matrix (DM). DM incorporation within polylactic acid microspheres prevented its thermal degradation during the 3D printing process. The scaffolds replicated the mechanical properties of native cartilage and demonstrated controlled release of DM proteins. Human mesenchymal stem cells (hMSCs) seeded on the composite scaffolds with DM and cultured in basal media self-assembled into aggregates mimicking mesenchymal condensates during embryonic development. The DM composite scaffolds also induced higher expression of biochemical markers of cartilage development than controls, providing evidence for their translational application in the treatment of OCIs. The present study demonstrates the potential of direct incorporation of DM with thermoplastics for 3D printing of patient-specific scaffolds for osteochondral regeneration.
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Affiliation(s)
- Stacey M S Gruber
- Department of Biomedical Engineering, College of Engineering and Applied Sciences, University of Cincinnati, Cincinnati, OH, USA
| | - Sumit Murab
- BioX Centre, School of Biosciences and Bioengineering, IIT Mandi, Himachal Pradesh, India
| | - Paulomi Ghosh
- Division of Pediatric Orthopaedic Surgery, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
| | - Patrick W Whitlock
- Department of Biomedical Engineering, College of Engineering and Applied Sciences, University of Cincinnati, Cincinnati, OH, USA; Division of Pediatric Orthopaedic Surgery, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA; Department of Orthopaedic Surgery, College of Medicine, University of Cincinnati, Cincinnati, OH, USA
| | - Chia-Ying J Lin
- Department of Biomedical Engineering, College of Engineering and Applied Sciences, University of Cincinnati, Cincinnati, OH, USA; Department of Orthopaedic Surgery, College of Medicine, University of Cincinnati, Cincinnati, OH, USA.
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Laubach M, Kobbe P, Hutmacher DW. Biodegradable interbody cages for lumbar spine fusion: Current concepts and future directions. Biomaterials 2022; 288:121699. [PMID: 35995620 DOI: 10.1016/j.biomaterials.2022.121699] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 07/14/2022] [Accepted: 07/22/2022] [Indexed: 11/16/2022]
Abstract
Lumbar fusion often remains the last treatment option for various acute and chronic spinal conditions, including infectious and degenerative diseases. Placement of a cage in the intervertebral space has become a routine clinical treatment for spinal fusion surgery to provide sufficient biomechanical stability, which is required to achieve bony ingrowth of the implant. Routinely used cages for clinical application are made of titanium (Ti) or polyetheretherketone (PEEK). Ti has been used since the 1980s; however, its shortcomings, such as impaired radiographical opacity and higher elastic modulus compared to bone, have led to the development of PEEK cages, which are associated with reduced stress shielding as well as no radiographical artefacts. Since PEEK is bioinert, its osteointegration capacity is limited, which in turn enhances fibrotic tissue formation and peri-implant infections. To address shortcomings of both of these biomaterials, interdisciplinary teams have developed biodegradable cages. Rooted in promising preclinical large animal studies, a hollow cylindrical cage (Hydrosorb™) made of 70:30 poly-l-lactide-co-d, l-lactide acid (PLDLLA) was clinically studied. However, reduced bony integration and unfavourable long-term clinical outcomes prohibited its routine clinical application. More recently, scaffold-guided bone regeneration (SGBR) with application of highly porous biodegradable constructs is emerging. Advancements in additive manufacturing technology now allow the cage designs that match requirements, such as stiffness of surrounding tissues, while providing long-term biomechanical stability. A favourable clinical outcome has been observed in the treatment of various bone defects, particularly for 3D-printed composite scaffolds made of medical-grade polycaprolactone (mPCL) in combination with a ceramic filler material. Therefore, advanced cage design made of mPCL and ceramic may also carry initial high spinal forces up to the time of bony fusion and subsequently resorb without clinical side effects. Furthermore, surface modification of implants is an effective approach to simultaneously reduce microbial infection and improve tissue integration. We present a design concept for a scaffold surface which result in osteoconductive and antimicrobial properties that have the potential to achieve higher rates of fusion and less clinical complications. In this review, we explore the preclinical and clinical studies which used bioresorbable cages. Furthermore, we critically discuss the need for a cutting-edge research program that includes comprehensive preclinical in vitro and in vivo studies to enable successful translation from bench to bedside. We develop such a conceptual framework by examining the state-of-the-art literature and posing the questions that will guide this field in the coming years.
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Affiliation(s)
- Markus Laubach
- Australian Research Council (ARC) Training Centre for Cell and Tissue Engineering Technologies, Queensland University of Technology (QUT), Brisbane, QLD, 4000 Australia; Australian Research Council (ARC) Training Centre for Multiscale 3D Imaging, Modelling, and Manufacturing (M3D Innovation), Queensland University of Technology, Brisbane, QLD 4000, Australia; Centre for Biomedical Technologies, School of Mechanical, Medical and Process Engineering, Queensland University of Technology, Brisbane, QLD 4059, Australia; Department of Orthopaedics, Trauma and Reconstructive Surgery, RWTH Aachen University Hospital, Pauwelsstraße 30, 52074 Aachen, Germany.
| | - Philipp Kobbe
- Department of Orthopaedics, Trauma and Reconstructive Surgery, RWTH Aachen University Hospital, Pauwelsstraße 30, 52074 Aachen, Germany
| | - Dietmar W Hutmacher
- Australian Research Council (ARC) Training Centre for Cell and Tissue Engineering Technologies, Queensland University of Technology (QUT), Brisbane, QLD, 4000 Australia; Australian Research Council (ARC) Training Centre for Multiscale 3D Imaging, Modelling, and Manufacturing (M3D Innovation), Queensland University of Technology, Brisbane, QLD 4000, Australia; Centre for Biomedical Technologies, School of Mechanical, Medical and Process Engineering, Queensland University of Technology, Brisbane, QLD 4059, Australia; Max Planck Queensland Center for the Materials Science of Extracellular Matrices, Queensland University of Technology, Brisbane, QLD 4000, Australia.
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Chemical Bonding of Biomolecules to the Surface of Nano-Hydroxyapatite to Enhance Its Bioactivity. COATINGS 2022. [DOI: 10.3390/coatings12070999] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Hydroxyapatite (HA) is a significant constituent of bones or teeth and is widely used as an artificial bone graft. It is often used to replace the lost bones or in reconstructing alveolar bones before dental implantation. HA with biological functions finds its importance in orthopedic surgery and dentistry to increase the local concentration of calcium ions, which activate the growth and differentiation of mesenchymal stem cells (MSC). To make relevant use of HA in bone transplantation, the surfaces of orthopedic and dental implants are frequently coated with nanosized hydroxyapatite (nHA), but its low dispersibility and tendency to form aggregates, the purpose of the surface modification of bone implants is defeated. To overcome these drawbacks and to improve the histocompatibility of bone implants or to use nHA in therapeutic applications of implants in the treatment of bone diseases, various studies suggested the attachment of biomolecules (growth factors) or drugs through chemical bonding at the surface of nHA. The growth factors or drugs bonded physically at the surface of nHA are mostly unstable and burst released immediately. Therefore, reported studies suggested that the surface of nHA needs to be modified through the chemical bonding of biologically active molecules at the surface of bone implants such as proteins, peptides, or naturally occurring polysaccharides to prevent the aggregation of nHA and to get homogenous dispersion of nHA in solution. The role of irradiation in producing bioactive and antibacterial nHA through morphological variations in surfaces of nHA is also summarized by considering internal structures and the formation of reactive oxygen species on irradiation. This mini-review aims to highlight the importance of small molecules such as proteins, peptides, drugs, and photocatalysts in surface property modification of nHA to achieve stable, bioactive, and antibacterial nHA to act as artificial bone implants (scaffolds) in combination with biodegradable polymers.
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Optimization of a Tricalcium Phosphate-Based Bone Model Using Cell-Sheet Technology to Simulate Bone Disorders. Processes (Basel) 2022. [DOI: 10.3390/pr10030550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Bone diseases such as osteoporosis, delayed or impaired bone healing, and osteoarthritis still represent a social, financial, and personal burden for affected patients and society. Fully humanized in vitro 3D models of cancellous bone tissue are needed to develop new treatment strategies and meet patient-specific needs. Here, we demonstrate a successful cell-sheet-based process for optimized mesenchymal stromal cell (MSC) seeding on a β-tricalcium phosphate (TCP) scaffold to generate 3D models of cancellous bone tissue. Therefore, we seeded MSCs onto the β-TCP scaffold, induced osteogenic differentiation, and wrapped a single osteogenically induced MSC sheet around the pre-seeded scaffold. Comparing the wrapped with an unwrapped scaffold, we did not detect any differences in cell viability and structural integrity but a higher cell seeding rate with osteoid-like granular structures, an indicator of enhanced calcification. Finally, gene expression analysis showed a reduction in chondrogenic and adipogenic markers, but an increase in osteogenic markers in MSCs seeded on wrapped scaffolds. We conclude from these data that additional wrapping of pre-seeded scaffolds will provide a local niche that enhances osteogenic differentiation while repressing chondrogenic and adipogenic differentiation. This approach will eventually lead to optimized preclinical in vitro 3D models of cancellous bone tissue to develop new treatment strategies.
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9
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Cha M, Jin YZ, Park JW, Lee KM, Han SH, Choi BS, Lee JH. Three-dimensional printed polylactic acid scaffold integrated with BMP-2 laden hydrogel for precise bone regeneration. Biomater Res 2021; 25:35. [PMID: 34706765 PMCID: PMC8554986 DOI: 10.1186/s40824-021-00233-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2021] [Accepted: 09/15/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Critical bone defects remain challenges for clinicians, which cannot heal spontaneously and require medical intervention. Following the development of three-dimensional (3D) printing technology is widely used in bone tissue engineering for its outstanding customizability. The 3D printed scaffolds were usually accompanied with growth factors, such as bone morphometric protein 2 (BMP-2), whose effects have been widely investigated on bone regeneration. We previously fabricated and investigated the effect of a polylactic acid (PLA) cage/Biogel scaffold as a carrier of BMP-2. In this study, we furtherly investigated the effect of another shape of PLA cage/Biogel scaffold as a carrier of BMP-2 in a rat calvaria defect model and an ectopic ossification (EO) model. METHOD The PLA scaffold was printed with a basic commercial 3D printer, and the PLA scaffold was combined with gelatin and alginate-based Biogel and BMP-2 to induce bone regeneration. The experimental groups were divided into PLA scaffold, PLA scaffold with Biogel, PLA scaffold filled with BMP-2, and PLA scaffold with Biogel and BMP-2 and were tested both in vitro and in vivo. One-way ANOVA with Bonferroni post-hoc analysis was used to determine whether statistically significant difference exists between groups. RESULT The in vitro results showed the cage/Biogel scaffold released BMP-2 with an initial burst release and followed by a sustained slow-release pattern. The released BMP-2 maintained its osteoinductivity for at least 14 days. The in vivo results showed the cage/Biogel/BMP-2 group had the highest bone regeneration in the rat calvarial defect model and EO model. Especially, the bone regenerated more regularly in the EO model at the implanted sites, which indicated the cage/Biogel had an outstanding ability to control the shape of regenerated bone. CONCLUSION In conclusion, the 3D printed PLA cage/Biogel scaffold system was proved to be a proper carrier for BMP-2 that induced significant bone regeneration and induced bone formation following the designed shape.
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Affiliation(s)
- Misun Cha
- Biotechnology Institute, Medifab Co. LTD., 70, Dusan-ro, Doksan-dong, Geumcheon-gu, Seoul, 085-84, South Korea.,Department of Orthopedic Surgery, SMG-SNU Boramae Medical Center, 39 Boramae Gil, Dongjak-Gu, Seoul, 156-707, South Korea
| | - Yuan-Zhe Jin
- Department of Orthopedic Surgery, College of Medicine, Seoul National University, Seoul, 110-799, South Korea.,Spine Department, The First Hospital of Jilin University, Changchun, 130031, China.,Jilin Engineering Research Center for Spine and Spinal Cord Injury, Changchun, China
| | - Jin Wook Park
- Biotechnology Institute, Medifab Co. LTD., 70, Dusan-ro, Doksan-dong, Geumcheon-gu, Seoul, 085-84, South Korea
| | - Kyung Mee Lee
- Department of Orthopedic Surgery, SMG-SNU Boramae Medical Center, 39 Boramae Gil, Dongjak-Gu, Seoul, 156-707, South Korea
| | - Shi Huan Han
- Department of Orthopedic Surgery, College of Medicine, Seoul National University, Seoul, 110-799, South Korea
| | - Byung Sun Choi
- Department of Orthopedic Surgery, SMG-SNU Boramae Medical Center, 39 Boramae Gil, Dongjak-Gu, Seoul, 156-707, South Korea
| | - Jae Hyup Lee
- Department of Orthopedic Surgery, SMG-SNU Boramae Medical Center, 39 Boramae Gil, Dongjak-Gu, Seoul, 156-707, South Korea. .,Department of Orthopedic Surgery, College of Medicine, Seoul National University, Seoul, 110-799, South Korea. .,Institute of Medical and Biological Engineering, Seoul National University Medical Research Center, Seoul, 110-799, South Korea.
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10
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Seims KB, Hunt NK, Chow LW. Strategies to Control or Mimic Growth Factor Activity for Bone, Cartilage, and Osteochondral Tissue Engineering. Bioconjug Chem 2021; 32:861-878. [PMID: 33856777 DOI: 10.1021/acs.bioconjchem.1c00090] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Growth factors play a critical role in tissue repair and regeneration. However, their clinical success is limited by their low stability, short half-life, and rapid diffusion from the delivery site. Supraphysiological growth factor concentrations are often required to demonstrate efficacy but can lead to adverse reactions, such as inflammatory complications and increased cancer risk. These issues have motivated the development of delivery systems that enable sustained release and controlled presentation of growth factors. This review specifically focuses on bioconjugation strategies to enhance growth factor activity for bone, cartilage, and osteochondral applications. We describe approaches to localize growth factors using noncovalent and covalent methods, bind growth factors via peptides, and mimic growth factor function with mimetic peptide sequences. We also discuss emerging and future directions to control spatiotemporal growth factor delivery to improve functional tissue repair and regeneration.
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Affiliation(s)
- Kelly B Seims
- Department of Materials Science and Engineering, Lehigh University, Bethlehem, Pennsylvania 18015, United States
| | - Natasha K Hunt
- Department of Bioengineering, Lehigh University, Bethlehem, Pennsylvania 18015, United States
| | - Lesley W Chow
- Department of Materials Science and Engineering, Lehigh University, Bethlehem, Pennsylvania 18015, United States
- Department of Bioengineering, Lehigh University, Bethlehem, Pennsylvania 18015, United States
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11
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Rahman M, Peng XL, Zhao XH, Gong HL, Sun XD, Wu Q, Wei DX. 3D bioactive cell-free-scaffolds for in-vitro/in-vivo capture and directed osteoinduction of stem cells for bone tissue regeneration. Bioact Mater 2021; 6:4083-4095. [PMID: 33997495 PMCID: PMC8091180 DOI: 10.1016/j.bioactmat.2021.01.013] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Revised: 12/21/2020] [Accepted: 01/09/2021] [Indexed: 12/24/2022] Open
Abstract
Hydrophilic bone morphogenetic protein 2 (BMP2) is easily degraded and difficult to load onto hydrophobic carrier materials, which limits the application of polyester materials in bone tissue engineering. Based on soybean-lecithin as an adjuvant biosurfactant, we designed a novel cell-free-scaffold of polymer of poly(ε-caprolactone) and poly(lactide-co-glycolide)-co-polyetherimide with abundant entrapped and continuously released BMP2 for in vivo stem cell-capture and in situ osteogenic induction, avoiding the use of exogenous cells. The optimized bioactive osteo-polyester scaffold (BOPSC), i.e. SBMP-10SC, had a high BMP2 entrapment efficiency of 95.35%. Due to its higher porosity of 83.42%, higher water uptake ratio of 850%, and sustained BMP2 release with polymer degradation, BOPSCs were demonstrated to support excellent in vitro capture, proliferation, migration and osteogenic differentiation of mouse adipose derived mesenchymal stem cells (mADSCs), and performed much better than traditional BMP-10SCs with unmodified BMP2 and single polyester scaffolds (10SCs). Furthermore, in vivo capture and migration of stem cells and differentiation into osteoblasts was observed in mice implanted with BOPSCs without exogenous cells, which enabled allogeneic bone formation with a high bone mineral density and ratios of new bone volume to existing tissue volume after 6 months. The BOPSC is an advanced 3D cell-free platform with sustained BMP2 supply for in situ stem cell capture and osteoinduction in bone tissue engineering with potential for clinical translation.
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Affiliation(s)
- Mamatali Rahman
- MOE Key Laboratory of Bioinformatics, Center for Synthetic and System Biology, Tsinghua University, Beijing, 100084, China.,School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Xue-Liang Peng
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, School of Medicine, Department of Life Sciences and Medicine, Northwest University, Xi'an, 710069, China
| | - Xiao-Hong Zhao
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, School of Medicine, Department of Life Sciences and Medicine, Northwest University, Xi'an, 710069, China
| | - Hai-Lun Gong
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, School of Medicine, Department of Life Sciences and Medicine, Northwest University, Xi'an, 710069, China
| | - Xiao-Dan Sun
- State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China.,Key Laboratory of Advanced Materials of Ministry of Education of China, School of Materials Science and Engineering, Tsinghua University, Beijing, 100084, China
| | - Qiong Wu
- MOE Key Laboratory of Bioinformatics, Center for Synthetic and System Biology, Tsinghua University, Beijing, 100084, China.,School of Life Sciences, Tsinghua University, Beijing, 100084, China
| | - Dai-Xu Wei
- Key Laboratory of Resource Biology and Biotechnology in Western China, Ministry of Education, School of Medicine, Department of Life Sciences and Medicine, Northwest University, Xi'an, 710069, China
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12
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Abdollahi Boraei SB, Nourmohammadi J, Bakhshandeh B, Dehghan MM, Gholami H, Gonzalez Z, Sanchez-Herencia AJ, Ferrari B. Capability of core-sheath polyvinyl alcohol-polycaprolactone emulsion electrospun nanofibrous scaffolds in releasing strontium ranelate for bone regeneration. Biomed Mater 2021; 16:025009. [PMID: 33434897 DOI: 10.1088/1748-605x/abdb07] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Core-sheath nanofibrous scaffolds from polyvinyl alcohol (PVA)-strontium ranelate (SrR)-Polycaprolactone (PCL) were prepared by water in oil electrospinning method. Thus, PCL (the oil phase) was used as the shell part and a mixture of PVA and SrR (the water phase) was inserted in the core. The amounts of SrR was varied from 0 to 15 wt.% Mussel-inspired dopamine-gelatin coating was done on the nanofibrous to improve their hydrophilicity and cellular attachment. The effect of the SrR content on morphology, mechanical, physicochemical, in vitro release behaviors, and biological properties as well as in vivo bone regeneration was investigated. Morphological observations revealed that continuous nanofibers with a core/shell structure were successfully obtained and the fibers diameter increased as the SrR content rose. X-ray diffraction (XRD) analysis revealed that SrR was molecularly distributed in the nanofibers and increasing the amount of the SrR decreased the crystallinity of the nanofibers. Moreover, the SrR release was regulated through the mechanism of Fickian diffusion and it was assumed as fast as possible in the samples with higher SrR content. The mesenchymal stem cell culturing showed improved cell proliferation by adding SrR and accelerating the expression of ALP, Runx2, Col I, and OCN genes. Besides, the SrR-loaded nanofibers improved bone formation of calvarial defects in a rat model as revealed by in vivo investigations.
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Affiliation(s)
- Seyyed Behnam Abdollahi Boraei
- Department of Life Science Engineering, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran. Instituto de Cerámica y Vidrio, CSIC, c/Kelsen 5, 28049 Madrid, Spain
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13
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Zhu H, Shi Z, Cai X, Yang X, Zhou C. The combination of PLLA/PLGA/PCL composite scaffolds integrated with BMP-2-loaded microspheres and low-intensity pulsed ultrasound alleviates steroid-induced osteonecrosis of the femoral head. Exp Ther Med 2020; 20:126. [PMID: 33005252 PMCID: PMC7523288 DOI: 10.3892/etm.2020.9254] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Accepted: 11/14/2019] [Indexed: 12/25/2022] Open
Abstract
Low-intensity pulsed ultrasound (LIPUS), which has been previously reported to promote bone repair, is proposed to be a noninvasive form of therapy for the treatment of osteonecrosis. Bone fillers made from composite scaffolds have been demonstrated to be effective for preventing bone defects such as osteonecrosis. The present study aimed to investigate whether the application of LIPUS combined with bone morphogenetic protein-2 (BMP-2)-loaded poly-L-lactic acid/polylactic-co-glycolic acid/poly-ε-caprolactone (PLLA/PLGA/PCL) composite scaffolds can improve recovery in a rat model of steroid-induced osteonecrosis of the femoral head (ONFH). BMP-2-loaded PLGA microspheres incorporated into PLLA/PLGA/PCL composite scaffolds were constructed. Bilateral femoral head LIPUS intervention was conducted in rats with steroid-induced ONFH. LIPUS intervention alone contributed to the alleviation of osteonecrosis, in addition to improving load-carrying capacity and accelerated bone formation, angiogenesis and differentiation. Subsequently, femoral head parameters and assessment of load-carrying capacity, bone formation-related factors, and angiogenesis- and differentiation-related factors were measured in rats with or without implanted BMP-2-loaded PLLA/PLGA/PCL composite scaffolds. LIPUS combined with the implantation of PLLA/PLGA/PCL composite scaffolds loaded with BMP-2 microspheres protected rats against steroid-induced ONFH and improved load-carrying capacity, bone formation, angiogenesis and differentiation. Together, these data support the use of BMP-2-loaded PLLA/PLGA/PCL composite scaffolds combined with LIPUS for ONFH as a potential alternative curative solution for treating bone diseases.
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Affiliation(s)
- Hanxiao Zhu
- Department of Orthopaedic Surgery, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, P.R. China
| | - Zhongli Shi
- Department of Orthopaedic Surgery, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, P.R. China
| | - Xunzi Cai
- Department of Orthopaedic Surgery, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, P.R. China
| | - Xiaobo Yang
- Department of Orthopaedic Surgery, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, P.R. China
| | - Chenhe Zhou
- Department of Orthopaedic Surgery, The Second Affiliated Hospital of Zhejiang University School of Medicine, Hangzhou, Zhejiang 310009, P.R. China
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14
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Zurina IM, Presniakova VS, Butnaru DV, Svistunov AA, Timashev PS, Rochev YA. Tissue engineering using a combined cell sheet technology and scaffolding approach. Acta Biomater 2020; 113:63-83. [PMID: 32561471 DOI: 10.1016/j.actbio.2020.06.016] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2020] [Revised: 06/08/2020] [Accepted: 06/10/2020] [Indexed: 12/13/2022]
Abstract
Cell sheet technology has remained quite popular among tissue engineering techniques over the last several years. Meanwhile, there is an apparent trend in modern scientific research towards combining different approaches and strategies. Accordingly, a large body of work has arisen where cell sheets are used not as separate structures, but in combination with scaffolds as supporting constructions. The aim of this review is to analyze the intersection of these two vast areas of tissue engineering described in the literature mainly within the last five years. Some practical and technical details are emphasized to provide information that can be useful in research design and planning. The first part of the paper describes the general issues concerning the use of combined technology, its advantages and limitations in comparison with those of other tissue engineering approaches. Next, the detailed literature analysis of in vivo studies aimed at the regeneration of different tissues is performed. A significant part of this section concerns bone regeneration. In addition to that, other connective tissue structures, including articular cartilage and fibrocartilage, ligaments and tendons, and some soft tissues are discussed. STATEMENT OF SIGNIFICANCE: This paper describes the intersection of two technologies used in designing of tissue-engineered constructions for regenerative medicine: cell sheets as extracellular matrix-rich structures and supporting scaffolds as essentials in tissue engineering. A large number of reviews are devoted to each of these scientific problems. However, the solution of complex problems of tissue engineering requires an integrated approach that includes both three-dimensional scaffolds and cell sheets. This manuscript serves as a description of advantages and limitations of this method, its use in regeneration of bones, connective tissues and soft tissues and some other details.
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Affiliation(s)
- Irina M Zurina
- Institute for Regenerative Medicine, Sechenov First Moscow State Medical University (Sechenov University), 119991 8-2 Trubetskaya St., Moscow, Russia; FSBSI Institute of General Pathology and Pathophysiology, 125315, 8 Baltiyskaya St., Moscow, Russia; FSBEI FPE "Russian Medical Academy of Continuous Professional Education" of the Ministry of Healthcare of Russia, 125993, 2/1-1 Barrikadnaya St., Moscow, Russia
| | - Viktoria S Presniakova
- Institute for Regenerative Medicine, Sechenov First Moscow State Medical University (Sechenov University), 119991 8-2 Trubetskaya St., Moscow, Russia
| | - Denis V Butnaru
- Sechenov First Moscow State Medical University (Sechenov University), 119991, 8-2 Trubetskaya St., Moscow, Russia
| | - Andrey A Svistunov
- Sechenov First Moscow State Medical University (Sechenov University), 119991, 8-2 Trubetskaya St., Moscow, Russia
| | - Peter S Timashev
- Institute for Regenerative Medicine, Sechenov First Moscow State Medical University (Sechenov University), 119991 8-2 Trubetskaya St., Moscow, Russia; Institute of Photonic Technologies, Research Center "Crystallography and Photonics", Russian Academy of Sciences, 108840, 2 Pionerskaya st., Troitsk, Moscow, Russia; Department of Polymers and Composites, N.N. Semenov Institute of Chemical Physics, 119991 4 Kosygin st., Moscow, Russia; Chemistry Department, Lomonosov Moscow State University, Leninskiye Gory 1‑3, Moscow 119991, Russia.
| | - Yury A Rochev
- Institute for Regenerative Medicine, Sechenov First Moscow State Medical University (Sechenov University), 119991 8-2 Trubetskaya St., Moscow, Russia; Centre for Research in Medical Devices (CÚRAM), National University of Ireland Galway, Galway H91 W2TY, Ireland
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15
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Xue PP, Yuan JD, Yao Q, Zhao YZ, Xu HL. Bioactive Factors-imprinted Scaffold Vehicles for Promoting Bone Healing: The Potential Strategies and the Confronted Challenges for Clinical Production. BIO INTEGRATION 2020. [DOI: 10.15212/bioi-2020-0010] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
Abstract Wound repair of bone is a complicated multistep process orchestrated by inflammation, angiogenesis, callus formation, and bone remodeling. Many bioactive factors (BFs) including cytokine and growth factors (GFs) have previously been reported to be involved in regulating
wound healing of bone and some exogenous BFs such as bone morphogenetic proteins (BMPs) were proven to be helpful for improving bone healing. In this regard, the BFs reported for boosting bone repair were initially categorized according to their regulatory mechanisms. Thereafter, the challenges
including short half-life, poor stability, and rapid enzyme degradation and deactivation for these exogenous BFs in bone healing are carefully outlined in this review. For these issues, BFs-imprinted scaffold vehicles have recently been reported to promote the stability of BFs and enhance
their half-life in vivo. This review is focused on the incorporation of BFs into the modulated biomaterials with various forms of bone tissue engineering applications: firstly, rigid bone graft substitutes (BGSs) were used to imprint BFs for large scale bone defect repair; secondly,
the soft sponge-like scaffold carrying BFs is discussed as filling materials for the cavity of bone defects; thirdly, various injectable vehicles including hydrogel, nanoparticles, and microspheres for the delivery of BFs were also introduced for irregular bone fracture repair. Meanwhile,
the challenges for BFs-imprinted scaffold vehicles are also analyzed in this review.
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Affiliation(s)
- Peng-Peng Xue
- Department of Pharmaceutics, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou City, Zhejiang Province 325035, China
| | - Jian-dong Yuan
- Department of Orthopaedics, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, People’s Republic of China
| | - Qing Yao
- Department of Pharmaceutics, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou City, Zhejiang Province 325035, China
| | - Ying-Zheng Zhao
- Department of Pharmaceutics, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou City, Zhejiang Province 325035, China
| | - He-Lin Xu
- Department of Pharmaceutics, School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou City, Zhejiang Province 325035, China
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16
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van Hengel I, Gelderman F, Athanasiadis S, Minneboo M, Weinans H, Fluit A, van der Eerden B, Fratila-Apachitei L, Apachitei I, Zadpoor A. Functionality-packed additively manufactured porous titanium implants. Mater Today Bio 2020; 7:100060. [PMID: 32577614 PMCID: PMC7305382 DOI: 10.1016/j.mtbio.2020.100060] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 05/26/2020] [Accepted: 05/28/2020] [Indexed: 12/30/2022] Open
Abstract
The holy grail of orthopedic implant design is to ward off both aseptic and septic loosening for long enough that the implant outlives the patient. Questing this holy grail is feasible only if orthopedic biomaterials possess a long list of functionalities that enable them to discharge the onerous task of permanently replacing the native bone tissue. Here, we present a rationally designed and additive manufacturing (AM) topologically ordered porous metallic biomaterial that is made from Ti-6Al-4V using selective laser melting and packs most (if not all) of the required functionalities into a single implant. In addition to presenting a fully interconnected porous structure and form-freedom that enables realization of patient-specific implants, the biomaterials developed here were biofunctionalized using plasma electrolytic oxidation to locally release both osteogenic (i.e. strontium) and antibacterial (i.e. silver ions) agents. The same single-step biofunctionalization process also incorporated hydroxyapatite into the surface of the implants. Our measurements verified the continued release of both types of active agents up to 28 days. Assessment of the antibacterial activity in vitro and in an ex vivo murine model demonstrated extraordinarily high levels of bactericidal effects against a highly virulent and multidrug-resistant Staphylococcus aureus strain (i.e. USA300) with total eradication of both planktonic and adherent bacteria. This strong antibacterial behavior was combined with a significantly enhanced osteogenic behavior, as evidenced by significantly higher levels of alkaline phosphatase (ALP) activity compared with non-biofunctionalized implants. Finally, we discovered synergistic antibacterial behavior between strontium and silver ions, meaning that 4-32 folds lower concentrations of silver ions were required to achieve growth inhibition and total killing of bacteria. The functionality-packed biomaterial presented here demonstrates a unique combination of functionalities that make it an advanced prototype of future orthopedic biomaterials where implants will outlive patients.
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Affiliation(s)
- I.A.J. van Hengel
- Additive Manufacturing Laboratory, Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering, Delft University of Technology, the Netherlands
| | - F.S.A. Gelderman
- Additive Manufacturing Laboratory, Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering, Delft University of Technology, the Netherlands
| | - S. Athanasiadis
- Additive Manufacturing Laboratory, Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering, Delft University of Technology, the Netherlands
| | - M. Minneboo
- Additive Manufacturing Laboratory, Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering, Delft University of Technology, the Netherlands
| | - H. Weinans
- Additive Manufacturing Laboratory, Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering, Delft University of Technology, the Netherlands
- Department of Orthopedics, University Medical Center Utrecht, Utrecht, the Netherlands
| | - A.C. Fluit
- Department of Medical Microbiology, University Medical Center Utrecht, Utrecht, the Netherlands
| | | | - L.E. Fratila-Apachitei
- Additive Manufacturing Laboratory, Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering, Delft University of Technology, the Netherlands
| | - I. Apachitei
- Additive Manufacturing Laboratory, Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering, Delft University of Technology, the Netherlands
| | - A.A. Zadpoor
- Additive Manufacturing Laboratory, Department of Biomechanical Engineering, Faculty of Mechanical, Maritime, and Materials Engineering, Delft University of Technology, the Netherlands
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17
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Sieberath A, Della Bella E, Ferreira AM, Gentile P, Eglin D, Dalgarno K. A Comparison of Osteoblast and Osteoclast In Vitro Co-Culture Models and Their Translation for Preclinical Drug Testing Applications. Int J Mol Sci 2020; 21:E912. [PMID: 32019244 PMCID: PMC7037207 DOI: 10.3390/ijms21030912] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Revised: 01/10/2020] [Accepted: 01/21/2020] [Indexed: 12/23/2022] Open
Abstract
As the population of western societies on average ages, the number of people affected by bone remodeling-associated diseases such as osteoporosis continues to increase. The development of new therapeutics is hampered by the high failure rates of drug candidates during clinical testing, which is in part due to the poor predictive character of animal models during preclinical drug testing. Co-culture models of osteoblasts and osteoclasts offer an alternative to animal testing and are considered to have the potential to improve drug development processes in the future. However, a robust, scalable, and reproducible 3D model combining osteoblasts and osteoclasts for preclinical drug testing purposes has not been developed to date. Here we review various types of osteoblast-osteoclast co-culture models and outline the remaining obstacles that must be overcome for their successful translation.
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Affiliation(s)
- Alexander Sieberath
- School of Engineering, Newcastle University, Newcastle-Upon-Tyne NE1 7RU, UK; (A.S.); (A.M.F.); (P.G.)
| | - Elena Della Bella
- AO Research Institute Davos, Clavadelerstrasse 8, 7270 Davos, Switzerland; (E.D.B.); (D.E.)
| | - Ana Marina Ferreira
- School of Engineering, Newcastle University, Newcastle-Upon-Tyne NE1 7RU, UK; (A.S.); (A.M.F.); (P.G.)
| | - Piergiorgio Gentile
- School of Engineering, Newcastle University, Newcastle-Upon-Tyne NE1 7RU, UK; (A.S.); (A.M.F.); (P.G.)
| | - David Eglin
- AO Research Institute Davos, Clavadelerstrasse 8, 7270 Davos, Switzerland; (E.D.B.); (D.E.)
| | - Kenny Dalgarno
- School of Engineering, Newcastle University, Newcastle-Upon-Tyne NE1 7RU, UK; (A.S.); (A.M.F.); (P.G.)
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18
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Camacho P, Busari H, Seims KB, Schwarzenberg P, Dailey HL, Chow LW. 3D printing with peptide-polymer conjugates for single-step fabrication of spatially functionalized scaffolds. Biomater Sci 2019; 7:4237-4247. [PMID: 31393469 DOI: 10.1039/c9bm00887j] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Biodegradable polymer-based scaffolds are widely used to provide support during early stages of regeneration and can be functionalized with various chemical groups or bioactive cues to promote desired cellular behavior. However, these scaffolds are often modified post-fabrication, which can lead to undesired changes and homogeneously distributed chemistries that fail to mimic the spatial biochemical organization found in native tissues. To address these challenges, surface functionalization can be achieved by 3D printing with pre-functionalized biodegradable polymers, such as peptide-modified polymer conjugates, to control the deposition of preferred chemistries. Peptide-PCL conjugates were synthesized with the canonical cell adhesion peptide motif RGDS or its negative control RGES and 3D printed into scaffolds displaying one or both peptides. The peptides were also modified with bioorthogonal groups, biotin and azide, to visualize peptide concentration and location by labeling with complementary fluorophores. Peptide concentration on the scaffold surface increased with increasing peptide-PCL conjugate concentration added to the ink prior to 3D printing, and scaffolds printed with the highest RGDS(biotin)-PCL concentrations showed a significant increase in NIH3T3 fibroblast adhesion. To demonstrate spatial control of peptide functionalization, multiple printer heads were used to print both peptide-PCL conjugates into the same construct in alternating patterns. Cells preferentially attached and spread on RGDS(biotin)-PCL fibers compared to RGES(azide)-PCL fibers, illustrating how spatial functionalization can be used to influence local cell behavior within a single biomaterial. This presents a versatile platform to generate multifunctional biomaterials that can mimic the biochemical organization found in native tissues to support functional regeneration.
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Affiliation(s)
- Paula Camacho
- Department of Bioengineering, Lehigh University, Bethlehem, PA, USA.
| | - Hafiz Busari
- Department of Materials Science and Engineering, Lehigh University, Bethlehem, PA, USA
| | - Kelly B Seims
- Department of Materials Science and Engineering, Lehigh University, Bethlehem, PA, USA
| | | | - Hannah L Dailey
- Department of Mechanical Engineering and Mechanics, Bethlehem, PA, USA
| | - Lesley W Chow
- Department of Bioengineering, Lehigh University, Bethlehem, PA, USA. and Department of Materials Science and Engineering, Lehigh University, Bethlehem, PA, USA
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19
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Zeng Y, Hoque J, Varghese S. Biomaterial-assisted local and systemic delivery of bioactive agents for bone repair. Acta Biomater 2019; 93:152-168. [PMID: 30711659 PMCID: PMC6615988 DOI: 10.1016/j.actbio.2019.01.060] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2018] [Revised: 01/25/2019] [Accepted: 01/29/2019] [Indexed: 01/05/2023]
Abstract
Although bone tissues possess an intrinsic capacity for repair, there are cases where bone healing is either impaired or insufficient, such as fracture non-union, osteoporosis, osteomyelitis, and cancers. In these cases, treatments like surgical interventions are used, either alone or in combination with bioactive agents, to promote tissue repair and manage associated clinical complications. Improving the efficacy of bioactive agents often requires carriers, with biomaterials being a pivotal player. In this review, we discuss the role of biomaterials in realizing the local and systemic delivery of biomolecules to the bone tissue. The versatility of biomaterials enables design of carriers with the desired loading efficiency, release profile, and on-demand delivery. Besides local administration, systemic administration of drugs is necessary to combat diseases like osteoporosis, warranting bone-targeting drug delivery systems. Thus, chemical moieties with the affinity towards bone extracellular matrix components like apatite minerals have been widely utilized to create bone-targeting carriers with better biodistribution, which cannot be achieved by the drugs alone. Bone-targeting carriers combined with the desired drugs or bioactive agents have been extensively investigated to enhance bone healing while minimizing off-target effects. Herein, these advancements in the field have been systematically reviewed. STATEMENT OF SIGNIFICANCE: Drug delivery is imperative when surgical interventions are not sufficient to address various bone diseases/defects. Biomaterial-assisted delivery systems have been designed to provide drugs with the desired loading efficiency, sustained release, and on-demand delivery to enhance bone healing. By surveying recent advances in the field, this review outlines the design of biomaterials as carriers for the local and systemic delivery of bioactive agents to the bone tissue. Particularly, biomaterials that bear chemical moieties with affinity to bone are attractive, as they can present the desired bioactive agents to the bone tissue efficiently and thus enhance the drug efficacy for bone repair.
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Affiliation(s)
- Yuze Zeng
- Department of Orthopaedic Surgery, Duke University School of Medicine, Durham, NC 27710, USA; Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27710, USA
| | - Jiaul Hoque
- Department of Orthopaedic Surgery, Duke University School of Medicine, Durham, NC 27710, USA
| | - Shyni Varghese
- Department of Orthopaedic Surgery, Duke University School of Medicine, Durham, NC 27710, USA; Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27710, USA; Department of Biomedical Engineering, Duke University, Durham, NC 27710, USA.
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20
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Marquetti I, Desai S. Orientation effects on the nanoscale adsorption behavior of bone morphogenetic protein-2 on hydrophilic silicon dioxide. RSC Adv 2019; 9:906-916. [PMID: 35517634 PMCID: PMC9059500 DOI: 10.1039/c8ra09165j] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 12/13/2018] [Indexed: 11/25/2022] Open
Abstract
Bone Morphogenetic Protein-2 (BMP-2) is a growth factor associated with different developmental functions in regenerative medicine and tissue engineering. Because of its favorable properties for the development of bone and cartilage tissue, BMP-2 promotes the biocompatibility of medical implants. In this research, molecular dynamics simulations were implemented to simulate the interaction of BMP-2 with a flat hydrophilic silicon dioxide substrate, an important biomaterial for medical applications. We considered the influence of four orthogonal protein orientations on the adsorption behavior. Results showed that arginine and lysine were the main residues to interact with the silicon dioxide substrate, directly adsorbing onto the surface and overcoming water layers. However, between these charged residues, we observed a preference for arginine to adsorb. Orientations with the α-helix loop closer to the surface at the beginning of the simulations had greater loss of secondary structure as compared to the other configurations. Among all the orientations, the end-on B configuration had favorable adsorption characteristics with a binding energy of 14 000 kJ mol-1 and retention of 21.7% β-sheets as confirmed by the Ramachandran plots. This research provides new insights into the nanoscale interaction of BMP-2 and silicon dioxide substrate with applications in orthopedic implants and regenerative medicine.
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Affiliation(s)
- Izabele Marquetti
- Department of Industrial & Systems Engineering, North Carolina A&T State University Greensboro NC 27411 USA
| | - Salil Desai
- Department of Industrial & Systems Engineering, North Carolina A&T State University Greensboro NC 27411 USA
- Wake Forest Institute for Regenerative Medicine, Wake Forest School of Medicine Winston-Salem NC 27157 USA
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21
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Abstract
Many research methods exist to elucidate the role of BMP-2 during bone regeneration. This chapter briefly reviews important animal models used in these studies and provides details on the rat femur defect model. This animal model is frequently utilized to measure the efficacy of osteogenic factors like BMP-2. Detailed information about delivery methods, dose range, and dose duration used in BMP-2-related studies are provided.
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Nune KC, Misra RDK, Bai Y, Li S, Yang R. Interplay of topographical and biochemical cues in regulating osteoblast cellular activity in BMP-2 eluting three-dimensional cellular titanium alloy mesh structures. J Biomed Mater Res A 2018; 107:49-60. [DOI: 10.1002/jbm.a.36520] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Revised: 06/22/2018] [Accepted: 07/31/2018] [Indexed: 01/05/2023]
Affiliation(s)
- Krishna Chaitanya Nune
- Biomaterials and Biomedical Engineering Research Laboratory, Department of Metallurgical, Materials, and Biomedical Engineering; The University of Texas at El Paso; 500 W. University Avenue, El Paso, Texas, 79968
| | - R. Devesh Kumar Misra
- Biomaterials and Biomedical Engineering Research Laboratory, Department of Metallurgical, Materials, and Biomedical Engineering; The University of Texas at El Paso; 500 W. University Avenue, El Paso, Texas, 79968
| | - Yun Bai
- Shenyang National Laboratory for Materials Science; Institute of Metal Research, Chinese Academy of Sciences; 72 Wenhua Road, Shenyang, 110016 China
| | - Shujun Li
- Shenyang National Laboratory for Materials Science; Institute of Metal Research, Chinese Academy of Sciences; 72 Wenhua Road, Shenyang, 110016 China
| | - Rui Yang
- Shenyang National Laboratory for Materials Science; Institute of Metal Research, Chinese Academy of Sciences; 72 Wenhua Road, Shenyang, 110016 China
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23
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Abstract
The conjugation of biomolecules can impart materials with the bioactivity necessary to modulate specific cell behaviors. While the biological roles of particular polypeptide, oligonucleotide, and glycan structures have been extensively reviewed, along with the influence of attachment on material structure and function, the key role played by the conjugation strategy in determining activity is often overlooked. In this review, we focus on the chemistry of biomolecule conjugation and provide a comprehensive overview of the key strategies for achieving controlled biomaterial functionalization. No universal method exists to provide optimal attachment, and here we will discuss both the relative advantages and disadvantages of each technique. In doing so, we highlight the importance of carefully considering the impact and suitability of a particular technique during biomaterial design.
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Affiliation(s)
- Christopher D. Spicer
- Department
of Medical Biochemistry and Biophysics, Karolinska Institutet, Scheeles Väg 2, Stockholm, Sweden
| | - E. Thomas Pashuck
- NJ
Centre for Biomaterials, Rutgers University, 145 Bevier Road, Piscataway, New Jersey United States
| | - Molly M. Stevens
- Department
of Medical Biochemistry and Biophysics, Karolinska Institutet, Scheeles Väg 2, Stockholm, Sweden
- Department
of Materials, Department of Bioengineering, and Institute of Biomedical Engineering, Imperial College London, Exhibition Road, London, United Kingdom
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24
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Kowalczewski CJ, Saul JM. Biomaterials for the Delivery of Growth Factors and Other Therapeutic Agents in Tissue Engineering Approaches to Bone Regeneration. Front Pharmacol 2018; 9:513. [PMID: 29896102 PMCID: PMC5986909 DOI: 10.3389/fphar.2018.00513] [Citation(s) in RCA: 95] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2018] [Accepted: 04/27/2018] [Indexed: 12/14/2022] Open
Abstract
Bone fracture followed by delayed or non-union typically requires bone graft intervention. Autologous bone grafts remain the clinical "gold standard". Recently, synthetic bone grafts such as Medtronic's Infuse Bone Graft have opened the possibility to pharmacological and tissue engineering strategies to bone repair following fracture. This clinically-available strategy uses an absorbable collagen sponge as a carrier material for recombinant human bone morphogenetic protein 2 (rhBMP-2) and a similar strategy has been employed by Stryker with BMP-7, also known as osteogenic protein-1 (OP-1). A key advantage to this approach is its "off-the-shelf" nature, but there are clear drawbacks to these products such as edema, inflammation, and ectopic bone growth. While there are clinical challenges associated with a lack of controlled release of rhBMP-2 and OP-1, these are among the first clinical examples to wed understanding of biological principles with biochemical production of proteins and pharmacological principles to promote tissue regeneration (known as regenerative pharmacology). After considering the clinical challenges with such synthetic bone grafts, this review considers the various biomaterial carriers under investigation to promote bone regeneration. This is followed by a survey of the literature where various pharmacological approaches and molecular targets are considered as future strategies to promote more rapid and mature bone regeneration. From the review, it should be clear that pharmacological understanding is a key aspect to developing these strategies.
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Affiliation(s)
| | - Justin M Saul
- Department of Chemical, Paper and Biomedical Engineering, Miami University, Oxford, OH, United States
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25
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Yan HJ, Casalini T, Hulsart-Billström G, Wang S, Oommen OP, Salvalaglio M, Larsson S, Hilborn J, Varghese OP. Synthetic design of growth factor sequestering extracellular matrix mimetic hydrogel for promoting in vivo bone formation. Biomaterials 2018; 161:190-202. [PMID: 29421555 DOI: 10.1016/j.biomaterials.2018.01.041] [Citation(s) in RCA: 61] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Revised: 01/25/2018] [Accepted: 01/25/2018] [Indexed: 01/31/2023]
Abstract
Synthetic scaffolds that possess an intrinsic capability to protect and sequester sensitive growth factors is a primary requisite for developing successful tissue engineering strategies. Growth factors such as recombinant human bone morphogenetic protein-2 (rhBMP-2) is highly susceptible to premature degradation and to provide a meaningful clinical outcome require high doses that can cause serious side effects. We discovered a unique strategy to stabilize and sequester rhBMP-2 by enhancing its molecular interactions with hyaluronic acid (HA), an extracellular matrix (ECM) component. We found that by tuning the initial protonation state of carboxylic acid residues of HA in a covalently crosslinked hydrogel modulate BMP-2 release at physiological pH by minimizing the electrostatic repulsion and maximizing the Van der Waals interactions. At neutral pH, BMP-2 release is primarily governed by Fickian diffusion, whereas at acidic pH both diffusion and electrostatic interactions between HA and BMP-2 become important as confirmed by molecular dynamics simulations. Our results were also validated in an in vivo rat ectopic model with rhBMP-2 loaded hydrogels, which demonstrated superior bone formation with acidic hydrogel as compared to the neutral counterpart. We believe this study provides new insight on growth factor stabilization and highlights the therapeutic potential of engineered matrices for rhBMP-2 delivery and may help to curtail the adverse side effects associated with the high dose of the growth factor.
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Affiliation(s)
- Hong Ji Yan
- Department of Chemistry, The Ångström Laboratory, Uppsala University, SE-751 21, Uppsala, Sweden
| | - Tommaso Casalini
- Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, 8093, Zurich, Switzerland; Institute for Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, 8093, Zurich, Switzerland; Institute of Mechanical Engineering and Material Technology, Department of Innovative Technologies, SUPSI, 6928, Manno, Switzerland
| | | | - Shujiang Wang
- Department of Chemistry, The Ångström Laboratory, Uppsala University, SE-751 21, Uppsala, Sweden
| | - Oommen P Oommen
- Bioengineering and Nanomedicine Lab, Faculty of Biomedical Sciences and Engineering & Biomeditech Institute, Tampere University of Technology, Tampere, 33720, Finland
| | - Matteo Salvalaglio
- Thomas Young Centre and Department of Chemical Engineering, University College London, London WC1E 7JE, UK
| | - Sune Larsson
- Department of Orthopedics, Uppsala University, Uppsala, Sweden
| | - Jöns Hilborn
- Department of Chemistry, The Ångström Laboratory, Uppsala University, SE-751 21, Uppsala, Sweden
| | - Oommen P Varghese
- Department of Chemistry, The Ångström Laboratory, Uppsala University, SE-751 21, Uppsala, Sweden.
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26
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Ghosh P, Gruber SMS, Lin CY, Whitlock PW. Microspheres containing decellularized cartilage induce chondrogenesis in vitro and remain functional after incorporation within a poly(caprolactone) filament useful for fabricating a 3D scaffold. Biofabrication 2018; 10:025007. [PMID: 29394158 DOI: 10.1088/1758-5090/aaa637] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
In this study, articular cartilage was decellularized preserving a majority of the inherent proteins, cytokines, growth factors and sGAGs. The decellularized cartilage matrix (dCM) was then encapsulated in poly(lactic acid) microspheres (MS + dCM) via double emulsion. Blank microspheres without dCM, MS(-), were also produced. The microspheres were spherical in shape and protein encapsulation efficiency within MS + dCM was 63.4%. The sustained release of proteins from MS + dCM was observed over 4 weeks in vitro. Both MS + dCM and MS(-) were cytocompatible. The sustained delivery of retained growth factors and cytokines from MS + dCM promoted cell migration in contrast to MS(-). Subsequently, chondrogenesis of human mesenchymal stem cells was upregulated in presence of MS + dCM as evidenced from immunohistochemistry, biochemical quantification and qPCR studies. Specifically, collagen II, aggrecan and SOX 9 gene expression were increased in the presence of MS + dCM by an order or more in magnitude compared to MS(-) with concomitant downregulation of hypertrophic genes (COL X) despite being cultured in the absence of chondrogenic media, (p < 0.05). Lastly, microspheres containing alkaline phosphatase (MS + ALP), a surrogate to assess the thermal stability of dCM proteins, incorporated within poly(caprolactone) filaments showed that the enzyme remained functional after filament production by melt extrusion. The establishment of a novel, thermally stable process for producing filaments containing chondroinductive microspheres provides evidence supporting subsequent development of a clinically-relevant, 3D scaffold fabricated from them for osteochondral regeneration and repair.
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Affiliation(s)
- Paulomi Ghosh
- Department of Orthopaedic Surgery, Cincinnati Children's Hospital Medical Center, Cincinnati, OH 45229, United States of America
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27
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Gohil SV, Wang L, Rowe DW, Nair LS. Spatially controlled rhBMP-2 mediated calvarial bone formation in a transgenic mouse model. Int J Biol Macromol 2018; 106:1159-1165. [DOI: 10.1016/j.ijbiomac.2017.08.116] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2017] [Revised: 08/18/2017] [Accepted: 08/21/2017] [Indexed: 11/30/2022]
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28
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Growth Factor Delivery Systems for Tissue Engineering and Regenerative Medicine. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1078:245-269. [PMID: 30357627 DOI: 10.1007/978-981-13-0950-2_13] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Growth factors (GFs) are often a key component in tissue engineering and regenerative medicine approaches. In order to fully exploit the therapeutic potential of GFs, GF delivery vehicles have to meet a number of key design criteria such as providing localized delivery and mimicking the dynamic native GF expression levels and patterns. The use of biomaterials as delivery systems is the most successful strategy for controlled delivery and has been translated into different commercially available systems. However, the risk of side effects remains an issue, which is mainly attributed to insufficient control over the release profile. This book chapter reviews the current strategies, chemistries, materials and delivery vehicles employed to overcome the current limitations associated with GF therapies.
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29
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Park SH, Kwon JS, Lee BS, Park JH, Lee BK, Yun JH, Lee BY, Kim JH, Min BH, Yoo TH, Kim MS. BMP2-modified injectable hydrogel for osteogenic differentiation of human periodontal ligament stem cells. Sci Rep 2017; 7:6603. [PMID: 28747761 PMCID: PMC5529463 DOI: 10.1038/s41598-017-06911-8] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 06/19/2017] [Indexed: 12/22/2022] Open
Abstract
This is the first report on the development of a covalently bone morphogenetic protein-2 (BMP2)-immobilized hydrogel that is suitable for osteogenic differentiation of human periodontal ligament stem cells (hPLSCs). O-propargyl-tyrosine (OpgY) was site-specifically incorporated into BMP2 to prepare BMP2-OpgY with an alkyne group. The engineered BMP2-OpgY exhibited osteogenic characteristics after in vitro osteogenic differentiation of hPLSCs, indicating the osteogenic ability of BMP2-OpgY. A methoxy polyethylene glycol-(polycaprolactone-(N3)) block copolymer (MC-N3) was prepared as an injectable in situ-forming hydrogel. BMP2 covalently immobilized on an MC hydrogel (MC-BMP2) was prepared quantitatively by a simple biorthogonal reaction between alkyne groups on BMP2-OpgY and azide groups on MC-N3 via a Cu(I)-catalyzed click reaction. The hPLSCs-loaded MC-BMP2 formed a hydrogel almost immediately upon injection into animals. In vivo osteogenic differentiation of hPLSCs in the MC-BMP2 formulation was confirmed by histological staining and gene expression analyses. Histological staining of hPLSC-loaded MC-BMP2 implants showed evidence of mineralized calcium deposits, whereas hPLSC-loaded MC-Cl or BMP2-OpgY mixed with MC-Cl, implants showed no mineral deposits. Additionally, MC-BMP2 induced higher levels of osteogenic gene expression in hPLSCs than in other groups. In conclusion, BMP2-OpgY covalently immobilized on MC-BMP2 induced osteogenic differentiation of hPLSCs as a noninvasive method for bone tissue engineering.
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Affiliation(s)
- Seung Hun Park
- Department of Molecular Science and Technology, Ajou University, Suwon, 443-749, Korea
| | - Jin Seon Kwon
- Department of Molecular Science and Technology, Ajou University, Suwon, 443-749, Korea
| | - Byeong Sung Lee
- Department of Molecular Science and Technology, Ajou University, Suwon, 443-749, Korea
| | - Ji Hoon Park
- Department of Molecular Science and Technology, Ajou University, Suwon, 443-749, Korea
| | - Bo Keun Lee
- Department of Molecular Science and Technology, Ajou University, Suwon, 443-749, Korea
| | - Jeong-Ho Yun
- Department of Periodontology, School of Dentistry and Institute of Oral Bioscience, Chonbuk National University, Jeonju, 561-712, Korea
| | - Bun Yeoul Lee
- Department of Molecular Science and Technology, Ajou University, Suwon, 443-749, Korea
| | - Jae Ho Kim
- Department of Molecular Science and Technology, Ajou University, Suwon, 443-749, Korea
| | - Byoung Hyun Min
- Department of Molecular Science and Technology, Ajou University, Suwon, 443-749, Korea
| | - Tae Hyeon Yoo
- Department of Molecular Science and Technology, Ajou University, Suwon, 443-749, Korea.
| | - Moon Suk Kim
- Department of Molecular Science and Technology, Ajou University, Suwon, 443-749, Korea.
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30
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Wang C, Lu WW, Wang M. Bicomponent fibrous scaffolds made through dual-source dual-power electrospinning: Dual delivery of rhBMP-2 and Ca-P nanoparticles and enhanced biological performances. J Biomed Mater Res A 2017; 105:2199-2209. [DOI: 10.1002/jbm.a.36084] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Revised: 03/01/2017] [Accepted: 03/29/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Chong Wang
- Department of Mechanical Engineering; The University of Hong Kong; Pokfulam Road Hong Kong
| | - William Weijia Lu
- Department of Orthopedics and Traumatology, Li Ka Shing Faculty of Medicine; The University of Hong Kong; Sasson Road Hong Kong
| | - Min Wang
- Department of Mechanical Engineering; The University of Hong Kong; Pokfulam Road Hong Kong
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31
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Pauly HM, Sathy BN, Olvera D, McCarthy HO, Kelly DJ, Popat KC, Dunne NJ, Haut Donahue TL. * Hierarchically Structured Electrospun Scaffolds with Chemically Conjugated Growth Factor for Ligament Tissue Engineering. Tissue Eng Part A 2017; 23:823-836. [PMID: 28350237 DOI: 10.1089/ten.tea.2016.0480] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
The anterior cruciate ligament (ACL) of the knee is vital for proper joint function and is commonly ruptured during sports injuries or car accidents. Due to a lack of intrinsic healing capacity and drawbacks with allografts and autografts, there is a need for a tissue-engineered ACL replacement. Our group has previously used aligned sheets of electrospun polycaprolactone nanofibers to develop solid cylindrical bundles of longitudinally aligned nanofibers. We have shown that these nanofiber bundles support cell proliferation and elongation and the hierarchical structure and material properties are similar to the native human ACL. It is possible to combine multiple nanofiber bundles to create a scaffold that attempts to mimic the macroscale structure of the ACL. The goal of this work was to develop a hierarchical bioactive scaffold for ligament tissue engineering using connective tissue growth factor (CTGF)-conjugated nanofiber bundles and evaluate the behavior of mesenchymal stem cells (MSCs) on these scaffolds in vitro and in vivo. CTGF was immobilized onto the surface of individual nanofiber bundles or scaffolds consisting of multiple nanofiber bundles. The conjugation efficiency and the release of conjugated CTGF were assessed using X-ray photoelectron spectroscopy, assays, and immunofluorescence staining. Scaffolds were seeded with MSCs and maintained in vitro for 7 days (individual nanofiber bundles), in vitro for 21 days (scaled-up scaffolds of 20 nanofiber bundles), or in vivo for 6 weeks (small scaffolds of 4 nanofiber bundles), and ligament-specific tissue formation was assessed in comparison to non-CTGF-conjugated control scaffolds. Results showed that CTGF conjugation encouraged cell proliferation and ligament-specific tissue formation in vitro and in vivo. The results suggest that hierarchical electrospun nanofiber bundles conjugated with CTGF are a scalable and bioactive scaffold for ACL tissue engineering.
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Affiliation(s)
- Hannah M Pauly
- 1 School of Biomedical Engineering, Colorado State University , Fort Collins, Colorado
| | - Binulal N Sathy
- 2 Trinity Centre for Bioengineering, Trinity Biomedical Sciences Institute , Trinity College Dublin, Dublin, Ireland
| | - Dinorath Olvera
- 2 Trinity Centre for Bioengineering, Trinity Biomedical Sciences Institute , Trinity College Dublin, Dublin, Ireland
| | - Helen O McCarthy
- 3 School of Pharmacy, Queen's University Belfast , Belfast, United Kingdom
| | - Daniel J Kelly
- 2 Trinity Centre for Bioengineering, Trinity Biomedical Sciences Institute , Trinity College Dublin, Dublin, Ireland .,4 Department of Mechanical and Manufacturing Engineering, School of Engineering, Trinity College Dublin , Dublin, Ireland .,5 Department of Anatomy, Royal College of Surgeons in Ireland , Dublin, Ireland .,6 Advanced Materials and Bioengineering Research Centre, Royal College of Surgeons in Ireland and Trinity College Dublin , Dublin, Ireland
| | - Ketul C Popat
- 1 School of Biomedical Engineering, Colorado State University , Fort Collins, Colorado.,7 Department of Mechanical Engineering, Colorado State University , Fort Collins, Colorado
| | - Nicholas J Dunne
- 2 Trinity Centre for Bioengineering, Trinity Biomedical Sciences Institute , Trinity College Dublin, Dublin, Ireland .,3 School of Pharmacy, Queen's University Belfast , Belfast, United Kingdom .,8 Centre for Medical Engineering Research, School of Mechanical and Manufacturing Engineering, Dublin City University , Dublin, Ireland
| | - Tammy Lynn Haut Donahue
- 1 School of Biomedical Engineering, Colorado State University , Fort Collins, Colorado.,7 Department of Mechanical Engineering, Colorado State University , Fort Collins, Colorado
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Formulation, Delivery and Stability of Bone Morphogenetic Proteins for Effective Bone Regeneration. Pharm Res 2017; 34:1152-1170. [PMID: 28342056 PMCID: PMC5418324 DOI: 10.1007/s11095-017-2147-x] [Citation(s) in RCA: 160] [Impact Index Per Article: 22.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Accepted: 03/17/2017] [Indexed: 12/22/2022]
Abstract
Bone morphogenetic proteins (BMPs) are responsible for bone formation during embryogenesis and bone regeneration and remodeling. The osteoinductive action of BMPs, especially BMP-2 and BMP-7, has led to their use in a range of insurmountable treatments where intervention is required for effective bone regeneration. Introduction of BMP products to the market, however, was not without reports of multiple complications and side effects. Aiming for optimization of the therapeutic efficacy and safety, efforts have been focused on improving the delivery of BMPs to lower the administered dose, localize the protein, and prolong its retention time at the site of action. A major challenge with these efforts is that the protein stability should be maintained. With this review we attempt to shed light on how the stability of BMPs can be affected in the formulation and delivery processes. We first provide a short overview of the current standing of the complications experienced with BMP products. We then discuss the different delivery parameters studied in association with BMPs, and their influence on the efficacy and safety of BMP treatments. In particular, the literature addressing the stability of BMPs and their possible interactions with components of the delivery system as well as their sensitivity to conditions of the formulation process is reviewed. In summary, recent developments in the fields of bioengineering and biopharmaceuticals suggest that a good understanding of the relationship between the formulation/delivery conditions and the stability of growth factors such as BMPs is a prerequisite for a safe and effective treatment.
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33
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Orciani M, Fini M, Di Primio R, Mattioli-Belmonte M. Biofabrication and Bone Tissue Regeneration: Cell Source, Approaches, and Challenges. Front Bioeng Biotechnol 2017; 5:17. [PMID: 28386538 PMCID: PMC5362636 DOI: 10.3389/fbioe.2017.00017] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2016] [Accepted: 02/22/2017] [Indexed: 01/06/2023] Open
Abstract
The growing occurrence of bone disorders and the increase in aging population have resulted in the need for more effective therapies to meet this request. Bone tissue engineering strategies, by combining biomaterials, cells, and signaling factors, are seen as alternatives to conventional bone grafts for repairing or rebuilding bone defects. Indeed, skeletal tissue engineering has not yet achieved full translation into clinical practice because of several challenges. Bone biofabrication by additive manufacturing techniques may represent a possible solution, with its intrinsic capability for accuracy, reproducibility, and customization of scaffolds as well as cell and signaling molecule delivery. This review examines the existing research in bone biofabrication and the appropriate cells and factors selection for successful bone regeneration as well as limitations affecting these approaches. Challenges that need to be tackled with the highest priority are the obtainment of appropriate vascularized scaffolds with an accurate spatiotemporal biochemical and mechanical stimuli release, in order to improve osseointegration as well as osteogenesis.
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Affiliation(s)
- Monia Orciani
- Department of Molecular and Clinical Sciences, Università Politenica delle Marche , Ancona , Italy
| | - Milena Fini
- Laboratory of Preclinical and Surgical Studies, Rizzoli Orthopedic Institute , Bologna , Italy
| | - Roberto Di Primio
- Department of Molecular and Clinical Sciences, Università Politenica delle Marche , Ancona , Italy
| | - Monica Mattioli-Belmonte
- Department of Molecular and Clinical Sciences, Università Politenica delle Marche , Ancona , Italy
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34
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Rubessa M, Polkoff K, Bionaz M, Monaco E, Milner DJ, Holllister SJ, Goldwasser MS, Wheeler MB. Use of Pig as a Model for Mesenchymal Stem Cell Therapies for Bone Regeneration. Anim Biotechnol 2017; 28:275-287. [PMID: 28267421 DOI: 10.1080/10495398.2017.1279169] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Bone is a plastic tissue with a large healing capability. However, extensive bone loss due to disease or trauma requires extreme therapy such as bone grafting or tissue-engineering applications. Presently, bone grafting is the gold standard for bone repair, but presents serious limitations including donor site morbidity, rejection, and limited tissue regeneration. The use of stem cells appears to be a means to overcome such limitations. Bone marrow mesenchymal stem cells (BMSC) have been the choice thus far for stem cell therapy for bone regeneration. However, adipose-derived stem cells (ASC) have similar immunophenotype, morphology, multilineage potential, and transcriptome compared to BMSC, and both types have demonstrated extensive osteogenic capacity both in vitro and in vivo in several species. The use of scaffolds in combination with stem cells and growth factors provides a valuable tool for guided bone regeneration, especially for complex anatomic defects. Before translation to human medicine, regenerative strategies must be developed in animal models to improve effectiveness and efficiency. The pig presents as a useful model due to similar macro- and microanatomy and favorable logistics of use. This review examines data that provides strong support for the clinical translation of the pig model for bone regeneration.
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Key Words
- ASC, adipose-derived stem cells
- BMP, bone morphogenetic protein
- BMSC, bone marrow mesenchymal stem cells
- Bone
- DEG, differentially expressed genes
- FDR, false-discovery rate
- HA, hydroxyapatite
- HA/TCP, hydroxyapatite/tricalcium phosphate
- MRI, magnetic resonance imaging
- MSC, mesenchymal stem cells
- ONFH, osteonecrosis of the femoral head
- PCL, Poly (ϵ-caprolactone)
- PEG, polyethylene glycol
- PLGA, polylactic-coglycolic acid
- TCP, beta tri-calcium phosphate
- USSC, unrestricted somatic stem cell
- scaffolds
- stem cells
- swine
- tissue engineering
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Affiliation(s)
- Marcello Rubessa
- a University of Illinois at Urbana-Champaign , Urbana , Illinois , USA
| | - Kathryn Polkoff
- a University of Illinois at Urbana-Champaign , Urbana , Illinois , USA
| | | | - Elisa Monaco
- b Oregon State University , Corvallis , Oregon , USA
| | - Derek J Milner
- a University of Illinois at Urbana-Champaign , Urbana , Illinois , USA
| | | | - Michael S Goldwasser
- a University of Illinois at Urbana-Champaign , Urbana , Illinois , USA.,d New Hanover Regional Medical Center , Wilmington , North Carolina , USA
| | - Matthew B Wheeler
- a University of Illinois at Urbana-Champaign , Urbana , Illinois , USA
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35
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Abstract
Growth factors are essential orchestrators of the normal bone fracture healing response. For non-union defects, delivery of exogenous growth factors to the injured site significantly improves healing outcomes. However, current clinical methods for scaffold-based growth factor delivery are fairly rudimentary, and there is a need for greater spatial and temporal regulation to increase their in vivo efficacy. Various approaches used to provide spatiotemporal control of growth factor delivery from bone tissue engineering scaffolds include physical entrapment, chemical binding, surface modifications, biomineralization, micro- and nanoparticle encapsulation, and genetically engineered cells. Here, we provide a brief review of these technologies, describing the fundamental mechanisms used to regulate release kinetics. Examples of their use in pre-clinical studies are discussed, and their capacities to provide tunable, growth factor delivery are compared. These advanced scaffold systems have the potential to provide safer, more effective therapies for bone regeneration than the systems currently employed in the clinic.
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Sailaja GS, Ramesh P, Vellappally S, Anil S, Varma HK. Biomimetic approaches with smart interfaces for bone regeneration. J Biomed Sci 2016; 23:77. [PMID: 27814702 PMCID: PMC5097415 DOI: 10.1186/s12929-016-0284-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2016] [Accepted: 09/05/2016] [Indexed: 01/18/2023] Open
Abstract
A 'smart tissue interface' is a host tissue-biomaterial interface capable of triggering favourable biochemical events inspired by stimuli responsive mechanisms. In other words, biomaterial surface is instrumental in dictating the interface functionality. This review aims to investigate the fundamental and favourable requirements of a 'smart tissue interface' that can positively influence the degree of healing and promote bone tissue regeneration. A biomaterial surface when interacts synergistically with the dynamic extracellular matrix, the healing process become accelerated through development of a smart interface. The interface functionality relies equally on bound functional groups and conjugated molecules belonging to the biomaterial and the biological milieu it interacts with. The essential conditions for such a special biomimetic environment are discussed. We highlight the impending prospects of smart interfaces and trying to relate the design approaches as well as critical factors that determine species-specific functionality with special reference to bone tissue regeneration.
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Affiliation(s)
- G S Sailaja
- Department of Polymer Science and Rubber Technology, Cochin University of Science and Technology, Cochin, 682 022, India.
| | - P Ramesh
- Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram, 695 012, India
| | - Sajith Vellappally
- Dental Biomaterials Research Chair, College of Applied Medical Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Sukumaran Anil
- Department of Preventive Dental Sciences, College of Dentistry, Prince Sattam Bin Abdulaziz University, Riyadh, Post Box 153, AIKharj 11942, Saudi Arabia
| | - H K Varma
- Biomedical Technology Wing, Sree Chitra Tirunal Institute for Medical Sciences and Technology, Thiruvananthapuram, 695 012, India.
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Chiu YC, Fong EL, Grindel BJ, Kasper FK, Harrington DA, Farach-Carson MC. Sustained delivery of recombinant human bone morphogenetic protein-2 from perlecan domain I - functionalized electrospun poly (ε-caprolactone) scaffolds for bone regeneration. J Exp Orthop 2016; 3:25. [PMID: 27714703 PMCID: PMC5053971 DOI: 10.1186/s40634-016-0057-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Accepted: 09/01/2016] [Indexed: 11/20/2022] Open
Abstract
Background Biomaterial scaffolds that deliver growth factors such as recombinant human bone morphogenetic proteins-2 (rhBMP-2) have improved clinical bone tissue engineering by enhancing bone tissue regeneration. This approach could be further improved if the controlled delivery of bioactive rhBMP-2 were sustained throughout the duration of osteogenesis from fibrous scaffolds that provide control over dose and bioactivity of rhBMP-2. In nature, heparan sulfate attached to core proteoglycans serves as the co-receptor that delivers growth factors to support tissue morphogenesis. Methods To mimic this behavior, we conjugated heparan sulfate decorated recombinant domain I of perlecan/HSPG2 onto an electrospun poly(ε-caprolactone) (PCL) scaffold, hypothesizing that the heparan sulfate chains will enhance rhBMP-2 loading onto the scaffold and preserve delivered rhBMP-2 bioactivity. Results In this study, we demonstrated that covalently conjugated perlecan domain I increased loading capacity of rhBMP-2 onto PCL scaffolds when compared to control unconjugated scaffolds. Additionally, rhBMP-2 released from the modified scaffolds enhanced alkaline phosphatase activity in W20–17 mouse bone marrow stromal cells, indicating the preservation of rhBMP-2 bioactivity indicative of osteogenesis. Conclusions We conclude that this platform provides a sophisticated and efficient approach to deliver bioactive rhBMP-2 for bone tissue regeneration applications. Electronic supplementary material The online version of this article (doi:10.1186/s40634-016-0057-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Yu-Chieh Chiu
- Fischell Department of Bioengineering, University of Maryland, 2212 Jeong H. Kim Building, College Park, MD, 20742, USA.
| | - Eliza L Fong
- Department of Biomedical Engineering, National University of Singapore, Singapore, Singapore
| | - Brian J Grindel
- Department of BioSciences, Rice University, 6500 Main Street, Houston, TX, 77030, USA
| | - Fred K Kasper
- Department of Orthodontics, The University of Texas Health Science Center at Houston, 7500 Cambridge St, Houston, TX, 77054, USA
| | - Daniel A Harrington
- Department of Bioengineering, Rice University, 6500 Main Street, Houston, TX, 77030, USA
| | - Mary C Farach-Carson
- Department of Bioengineering, Rice University, 6500 Main Street, Houston, TX, 77030, USA.,Department of BioSciences, Rice University, 6500 Main Street, Houston, TX, 77030, USA
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Ashtiani MK, Zandi M, Barzin J, Tahamtani Y, Ghanian MH, Moradmand A, Ehsani M, Nezari H, Larijani MR, Baharvand H. Substrate-mediated commitment of human embryonic stem cells for hepatic differentiation. J Biomed Mater Res A 2016; 104:2861-72. [DOI: 10.1002/jbm.a.35830] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Revised: 06/18/2016] [Accepted: 07/07/2016] [Indexed: 12/11/2022]
Affiliation(s)
- Mohammad Kazemi Ashtiani
- Department of Stem Cells and Developmental Biology; Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR; Tehran Iran
- Biomaterials Department; Iran Polymer and Petrochemical Institute; Tehran Iran
| | - Mojgan Zandi
- Biomaterials Department; Iran Polymer and Petrochemical Institute; Tehran Iran
| | - Jalal Barzin
- Biomaterials Department; Iran Polymer and Petrochemical Institute; Tehran Iran
| | - Yaser Tahamtani
- Department of Stem Cells and Developmental Biology; Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR; Tehran Iran
| | - Mohammad Hossein Ghanian
- Department of Stem Cells and Developmental Biology; Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR; Tehran Iran
- Biomaterials Department; Iran Polymer and Petrochemical Institute; Tehran Iran
| | - Azadeh Moradmand
- Biomaterials Department; Iran Polymer and Petrochemical Institute; Tehran Iran
| | - Morteza Ehsani
- Biomaterials Department; Iran Polymer and Petrochemical Institute; Tehran Iran
| | - Hossein Nezari
- Department of Stem Cells and Developmental Biology; Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR; Tehran Iran
| | - Mehran Rezaei Larijani
- Department of Stem Cells and Developmental Biology; Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR; Tehran Iran
| | - Hossein Baharvand
- Department of Stem Cells and Developmental Biology; Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR; Tehran Iran
- Department of Developmental Biology; University of Science and Culture; Tehran Iran
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39
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Evaluation of multi-scale mineralized collagen-polycaprolactone composites for bone tissue engineering. J Mech Behav Biomed Mater 2016; 61:318-327. [PMID: 27104930 DOI: 10.1016/j.jmbbm.2016.03.032] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2016] [Revised: 03/28/2016] [Accepted: 03/29/2016] [Indexed: 12/19/2022]
Abstract
A particular challenge in biomaterial development for treating orthopedic injuries stems from the need to balance bioactive design criteria with the mechanical and geometric constraints governed by the physiological wound environment. Such trade-offs are of particular importance in large craniofacial bone defects which arise from both acute trauma and chronic conditions. Ongoing efforts in our laboratory have demonstrated a mineralized collagen biomaterial that can promote human mesenchymal stem cell osteogenesis in the absence of osteogenic media but that possesses suboptimal mechanical properties in regards to use in loaded wound sites. Here we demonstrate a multi-scale composite consisting of a highly bioactive mineralized collagen-glycosaminoglycan scaffold with micron-scale porosity and a polycaprolactone support frame (PCL) with millimeter-scale porosity. Fabrication of the composite was performed by impregnating the PCL support frame with the mineral scaffold precursor suspension prior to lyophilization. Here we evaluate the mechanical properties, permeability, and bioactivity of the resulting composite. Results indicated that the PCL support frame dominates the bulk mechanical response of the composite resulting in a 6000-fold increase in modulus compared to the mineral scaffold alone. Similarly, the incorporation of the mineral scaffold matrix into the composite resulted in a higher specific surface area compared to the PCL frame alone. The increased specific surface area in the collagen-PCL composite promoted increased initial attachment of porcine adipose derived stem cells versus the PCL construct.
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Pilipchuk SP, Monje A, Jiao Y, Hao J, Kruger L, Flanagan CL, Hollister SJ, Giannobile WV. Integration of 3D Printed and Micropatterned Polycaprolactone Scaffolds for Guidance of Oriented Collagenous Tissue Formation In Vivo. Adv Healthc Mater 2016; 5:676-87. [PMID: 26820240 DOI: 10.1002/adhm.201500758] [Citation(s) in RCA: 74] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2015] [Revised: 10/16/2015] [Indexed: 12/20/2022]
Abstract
Scaffold design incorporating multiscale cues for clinically relevant, aligned tissue regeneration has potential to improve structural and functional integrity of multitissue interfaces. The objective of this preclinical study is to develop poly(ε-caprolactone) (PCL) scaffolds with mesoscale and microscale architectural cues specific to human ligament progenitor cells and assess their ability to form aligned bone-ligament-cementum complexes in vivo. PCL scaffolds are designed to integrate a 3D printed bone region with a micropatterned PCL thin film consisting of grooved pillars. The patterned film region is seeded with human ligament cells, fibroblasts transduced with bone morphogenetic protein-7 genes seeded within the bone region, and a tooth dentin segment positioned on the ligament region prior to subcutaneous implantation into a murine model. Results indicate increased tissue alignment in vivo using micropatterned PCL films, compared to random-porous PCL. At week 6, 30 μm groove depth significantly enhances oriented collagen fiber thickness, overall cell alignment, and nuclear elongation relative to 10 μm groove depth. This study demonstrates for the first time that scaffolds with combined hierarchical mesoscale and microscale features can align cells in vivo for oral tissue repair with potential for improving the regenerative response of other bone-ligament complexes.
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Affiliation(s)
- Sophia P. Pilipchuk
- Department of Biomedical Engineering; 1101 Beal Ave; University of Michigan; Ann Arbor MI 48109 USA
- Department of Periodontics and Oral Medicine; 1011 N. University Ave; University of Michigan; Ann Arbor MI 48109 USA
| | - Alberto Monje
- Department of Periodontics and Oral Medicine; 1011 N. University Ave; University of Michigan; Ann Arbor MI 48109 USA
| | - Yizu Jiao
- Department of Periodontics and Oral Medicine; 1011 N. University Ave; University of Michigan; Ann Arbor MI 48109 USA
| | - Jie Hao
- Department of Periodontics and Oral Medicine; 1011 N. University Ave; University of Michigan; Ann Arbor MI 48109 USA
| | - Laura Kruger
- Department of Periodontics and Oral Medicine; 1011 N. University Ave; University of Michigan; Ann Arbor MI 48109 USA
| | - Colleen L. Flanagan
- Department of Biomedical Engineering; 1101 Beal Ave; University of Michigan; Ann Arbor MI 48109 USA
| | - Scott J. Hollister
- Department of Biomedical Engineering; 1101 Beal Ave; University of Michigan; Ann Arbor MI 48109 USA
- Department of Mechanical Engineering; Department of Surgery; University of Michigan; Ann Arbor MI 48109 USA
| | - William V. Giannobile
- Department of Biomedical Engineering; 1101 Beal Ave; University of Michigan; Ann Arbor MI 48109 USA
- Department of Periodontics and Oral Medicine; 1011 N. University Ave; University of Michigan; Ann Arbor MI 48109 USA
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Tang D, Tare RS, Yang LY, Williams DF, Ou KL, Oreffo ROC. Biofabrication of bone tissue: approaches, challenges and translation for bone regeneration. Biomaterials 2016; 83:363-82. [PMID: 26803405 DOI: 10.1016/j.biomaterials.2016.01.024] [Citation(s) in RCA: 348] [Impact Index Per Article: 43.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2015] [Revised: 12/21/2015] [Accepted: 01/01/2016] [Indexed: 02/08/2023]
Abstract
The rising incidence of bone disorders has resulted in the need for more effective therapies to meet this demand, exacerbated by an increasing ageing population. Bone tissue engineering is seen as a means of developing alternatives to conventional bone grafts for repairing or reconstructing bone defects by combining biomaterials, cells and signalling factors. However, skeletal tissue engineering has not yet achieved full translation into clinical practice as a consequence of several challenges. The use of additive manufacturing techniques for bone biofabrication is seen as a potential solution, with its inherent capability for reproducibility, accuracy and customisation of scaffolds as well as cell and signalling factor delivery. This review highlights the current research in bone biofabrication, the necessary factors for successful bone biofabrication, in addition to the current limitations affecting biofabrication, some of which are a consequence of the limitations of the additive manufacturing technology itself.
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Affiliation(s)
- Daniel Tang
- Centre for Human Development, Stem Cells and Regeneration, Faculty of Medicine, University of Southampton, Southampton, SO16 6YD, United Kingdom
| | - Rahul S Tare
- Centre for Human Development, Stem Cells and Regeneration, Faculty of Medicine, University of Southampton, Southampton, SO16 6YD, United Kingdom; Engineering Sciences, Faculty of Engineering and the Environment, University of Southampton, Southampton, SO17 1BJ, United Kingdom
| | - Liang-Yo Yang
- Department of Physiology, School of Medicine, College of Medicine, Taipei Medical University, Taipei, 110, Taiwan, ROC; Research Centre for Biomedical Devices and Prototyping Production, Taipei Medical University, Taipei, 110, Taiwan, ROC; School of Medicine, College of Medicine, China Medical University, Taichung, 40402, Taiwan, ROC
| | - David F Williams
- Graduate Institute of Biomedical Materials and Tissue Engineering, Taipei Medical University, Taipei, 110, Taiwan, ROC; Institute of Regenerative Medicine, Wake Forest School of Medicine, Winston-Salem, NC, USA
| | - Keng-Liang Ou
- Research Centre for Biomedical Devices and Prototyping Production, Taipei Medical University, Taipei, 110, Taiwan, ROC; Graduate Institute of Biomedical Materials and Tissue Engineering, Taipei Medical University, Taipei, 110, Taiwan, ROC; Research Centre for Biomedical Implants and Microsurgery Devices, Taipei Medical University, Taipei, 110, Taiwan, ROC; Department of Dentistry, Taipei Medical University-Shuang Ho Hospital, New Taipei City, 235, Taiwan, ROC.
| | - Richard O C Oreffo
- Centre for Human Development, Stem Cells and Regeneration, Faculty of Medicine, University of Southampton, Southampton, SO16 6YD, United Kingdom.
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Nune KC, Kumar A, Murr LE, Misra RDK. Interplay between self-assembled structure of bone morphogenetic protein-2 (BMP-2) and osteoblast functions in three-dimensional titanium alloy scaffolds: Stimulation of osteogenic activity. J Biomed Mater Res A 2015; 104:517-32. [PMID: 26475990 DOI: 10.1002/jbm.a.35592] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Revised: 10/09/2015] [Accepted: 10/15/2015] [Indexed: 12/18/2022]
Abstract
Three-dimensional cellular scaffolds are receiving significant attention in bone tissue engineering to treat segmental bone defects. However, there are indications of lack of significant osteoinductive ability of three-dimensional cellular scaffolds. In this regard, the objective of the study is to elucidate the interplay between bone morphogenetic protein (BMP-2) and osteoblast functions on 3D mesh structures with different porosities and pore size that were fabricated by electron beam melting. Self-assembled dendritic microstructure with interconnected cellular-type morphology of BMP-2 on 3D scaffolds stimulated osteoblast functions including adhesion, proliferation, and mineralization, with prominent effect on 2-mm mesh. Furthermore, immunofluorescence studies demonstrated higher density and viability of osteoblasts on lower porosity mesh structure (2 mm) as compared to 3- and 4-mm mesh structures. Enhanced filopodia cellular extensions with extensive cell spreading was observed on BMP-2 treated mesh structures, a behavior that is attributed to the unique self-assembled structure of BMP-2 that effectively communicates with the cells. The study underscores the potential of BMP-2 in imparting osteoinductive capability to the 3D printed scaffolds.
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Affiliation(s)
- K C Nune
- Biomaterials and Biomedical Engineering Research Laboratory, Department of Metallurgical, Materials, and Biomedical Engineering, University of Texas at El Paso, 500 W. University Avenue, El Paso, Texas, 79968
| | - A Kumar
- Biomaterials and Biomedical Engineering Research Laboratory, Department of Metallurgical, Materials, and Biomedical Engineering, University of Texas at El Paso, 500 W. University Avenue, El Paso, Texas, 79968
| | - L E Murr
- Biomaterials and Biomedical Engineering Research Laboratory, Department of Metallurgical, Materials, and Biomedical Engineering, University of Texas at El Paso, 500 W. University Avenue, El Paso, Texas, 79968
| | - R D K Misra
- Biomaterials and Biomedical Engineering Research Laboratory, Department of Metallurgical, Materials, and Biomedical Engineering, University of Texas at El Paso, 500 W. University Avenue, El Paso, Texas, 79968
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Surface-mediated delivery of siRNA from fibrin hydrogels for knockdown of the BMP-2 binding antagonist noggin. Acta Biomater 2015; 25:109-20. [PMID: 26234488 DOI: 10.1016/j.actbio.2015.07.045] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Revised: 06/28/2015] [Accepted: 07/29/2015] [Indexed: 12/26/2022]
Abstract
Antagonists and inhibitory molecules responsible for maintaining tissue homeostasis can present a significant barrier to healing when tissue engineering/regenerative medicine strategies are employed. One example of this situation is the up-regulation of antagonists such as noggin in response to increasing concentrations of bone morphogenetic protein-2 (BMP-2) present from endogenous bone repair processes or delivered exogenously from biomaterials (synthetic bone grafts). While recombinant human (rh)BMP-2 delivered from synthetic bone grafts has been shown to be an effective alternative to autografts and allografts, the supraphysiological doses of rhBMP-2 have led to clinically-adverse side effects. The high rhBMP-2 dosage may be required, in part, to overcome the presence of antagonists such as noggin. Small interfering RNA (siRNA) is an appealing approach to overcome this problem because it can knock-down antagonists or inhibitory molecules in a temporary manner. Here, we conducted fundamental studies on the delivery of siRNA from material surfaces as a means to knock-down antagonists like noggin. Non-viral cationic lipid (Lipofectamine)-siRNA complexes were delivered from a fibrin hydrogel surface to MC3T3-E1 preosteoblasts that were treated with a supraphysiological dose of rhBMP-2 to achieve noggin mRNA expression levels higher than cells naïve to rhBMP-2. Confocal microscopy and flow cytometry showed intracellular uptake of siRNA in over 98% of MC3T3-E1 cells after 48 h. Doses of 0.5 and 1 μg noggin siRNA were able to significantly reduce noggin mRNA to levels equivalent to those in MC3T3-E1 cells not exposed to rhBMP-2 with no effects on cell viability. STATEMENT OF SIGNIFICANCE Small interfering RNA (siRNA) has been considered for treatment of diseases ranging from Alzheimer's to cancer. However, the ability to use siRNA in conjunction with biomaterials to direct tissue regeneration processes has received relatively little attention. Using the bone morphogenetic protein 2 antagonist, noggin, as a model, this research describes an approach to knock-down molecules that are inhibitory to desired regenerative pathways at the mRNA level via siRNA delivery from a hydrogel surface. Interactions between the material (fibrin) surface and polycation-siRNA complexes, release of the siRNA from the material surface, high levels of cellular uptake/internalization of siRNA, and significant knockdown of the targeting (noggin) mRNA are demonstrated. Broader future applications include those to nerve regeneration, cardiovascular tissue engineering, directing (stem) cell behavior, and mitigating inflammatory responses to materials.
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Gohil SV, Brittain SB, Kan HM, Drissi H, Rowe DW, Nair LS. Evaluation of enzymatically crosslinked injectable glycol chitosan hydrogel. J Mater Chem B 2015; 3:5511-5522. [PMID: 32262522 DOI: 10.1039/c5tb00663e] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Enzymatically cross-linkable phenol-conjugated glycol chitosan was prepared by reacting glycol chitosan with 3-(4-hydroxyphenyl)propionic acid (HPP). The chemical modification was confirmed by FTIR, 1H-NMR and UV spectroscopy. Glycol chitosan hydrogels (HPP-GC) with or without rhBMP-2 were prepared by the oxidative coupling of the substituted phenol groups in the presence of hydrogen peroxide and horse radish peroxidase. Rheological characterization demonstrated the feasibility of developing hydrogels with varying storage moduli by changing the polymer concentration. The gel presented a microporous structure with pore sizes ranging from 50-350 μm. The good viability of encapsulated 7F2 osteoblasts indicated non-toxicity of the gelation conditions. In vitro release of rhBMP-2 in phosphate buffer solution showed ∼11% release in 360 h. The ability of the hydrogel to maintain the in vivo bioactivity of rhBMP-2 was evaluated in a bilateral critical size calvarial bone defect model in Col3.6 transgenic fluorescent reporter mice. The presence of fluorescent green osteoblast cells with overlying red alizarin complexone and yellow stain indicating osteoclast TRAP activity confirmed active cell-mediated mineralization and remodelling process at the implantation site. The complete closure of the defect site at 4 and 8 weeks post implantation demonstrated the potent osteoinductivity of the rhBMP-2 containing gel.
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Affiliation(s)
- Shalini V Gohil
- Department of Orthopaedic Surgery, UConn Health, E-7041, MC-3711, 263 Farmington Avenue, Farmington, Connecticut 06030, USA.
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Motamedian SR, Hosseinpour S, Ahsaie MG, Khojasteh A. Smart scaffolds in bone tissue engineering: A systematic review of literature. World J Stem Cells 2015; 7:657-668. [PMID: 25914772 PMCID: PMC4404400 DOI: 10.4252/wjsc.v7.i3.657] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/29/2014] [Revised: 12/10/2014] [Accepted: 12/31/2014] [Indexed: 02/06/2023] Open
Abstract
AIM: To improve osteogenic differentiation and attachment of cells.
METHODS: An electronic search was conducted in PubMed from January 2004 to December 2013. Studies which performed smart modifications on conventional bone scaffold materials were included. Scaffolds with controlled release or encapsulation of bioactive molecules were not included. Experiments which did not investigate response of cells toward the scaffold (cell attachment, proliferation or osteoblastic differentiation) were excluded.
RESULTS: Among 1458 studies, 38 met the inclusion and exclusion criteria. The main scaffold varied extensively among the included studies. Smart modifications included addition of growth factors (group I-11 studies), extracellular matrix-like molecules (group II-13 studies) and nanoparticles (nano-HA) (group III-17 studies). In all groups, surface coating was the most commonly applied approach for smart modification of scaffolds. In group I, bone morphogenetic proteins were mainly used as growth factor stabilized on polycaprolactone (PCL). In group II, collagen 1 in combination with PCL, hydroxyapatite (HA) and tricalcium phosphate were the most frequent scaffolds used. In the third group, nano-HA with PCL and chitosan were used the most. As variable methods were used, a thorough and comprehensible compare between the results and approaches was unattainable.
CONCLUSION: Regarding the variability in methodology of these in vitro studies it was demonstrated that smart modification of scaffolds can improve tissue properties.
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Baradaran-Rafii A, Biazar E, Heidari-keshel S. Cellular Response of Limbal Stem Cells on Polycaprolactone Nanofibrous Scaffolds for Ocular Epithelial Regeneration. Curr Eye Res 2015; 41:326-33. [DOI: 10.3109/02713683.2015.1019004] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Choi B, Kim S, Fan J, Kowalski T, Petrigliano F, Evseenko D, Lee M. Covalently conjugated transforming growth factor-β1 in modular chitosan hydrogels for the effective treatment of articular cartilage defects. Biomater Sci 2015. [PMID: 26222593 DOI: 10.1039/c4bm00431k] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Approaches to control precisely growth factor presentation to a tissue defect in a sustained fashion are of increasing interest for a number of complex tissue engineering applications. Although transforming growth factor beta-1 (TGF-β1) plays a key role in promoting chondrogenesis, the therapeutic use of TGF-β1 is limited by its inherent protein instability, requiring high amounts of the protein that can cause adverse side effects with inefficient cartilage formation. In this work, we have developed strategies to stabilize TGF-β1 signaling in the injectable, visible blue light inducible chitosan (MeGC) hydrogel system for specific use in cartilage regeneration. We successfully modulated delivery of TGF-β1 with reduced burst release in a complex biological environment of serum and cells by covalently conjugating the protein to MeGC hydrogels with preserving type II collagen, one of the major cartilaginous extracellular matrix (ECM) components. The hydrogel system supported cellular condensation and deposition of cartilaginous ECM by encapsulating adipose derived stem cells in vitro. We confirmed further the ability of these TGF-β1 functionalized hydrogel systems to promote cartilage regeneration in challenging healing environments such as in a rat partial-thickness chondral defect model which present a limited source of subchondral bone marrow elements. These results suggest a new injectable delivery modality of therapeutic agents to improve clinical cartilage repair.
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Affiliation(s)
- Bogyu Choi
- Division of Advanced Prosthodontics, University of California, Los Angeles, CA 90095, USA.
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Vaidya P, Grove T, Edgar KJ, Goldstein AS. Surface grafting of chitosan shell, polycaprolactone core fiber meshes to confer bioactivity. J BIOACT COMPAT POL 2015. [DOI: 10.1177/0883911515571147] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Electrospinning of polyesters (e.g. polycaprolactone) is an attractive approach for fabricating meshes with mechanical properties suitable for orthopedic tissue engineering applications. However, the resultant fused-fiber meshes are biologically inert, necessitating surface grafting of bioactive factors to stimulate cell adhesion. In this study, hydrophilic meshes displaying primary amine groups were prepared by coaxially electrospinning fibers with a chitosan/poly(ethylene oxide) shell and a polycaprolactone core. These chitosan–polycaprolactone fiber meshes were mechanically robust (Young’s modulus of 10.1 ± 1.6 MPa under aqueous conditions) with tensile properties comparable to polycaprolactone fiber meshes. Next, the integrin adhesion peptide arginine–glycine–aspartic acid was grafted to chitosan–polycaprolactone fiber meshes. Cell culture studies using bone marrow stromal cells indicated significantly better initial attachment and spreading on arginine–glycine–aspartic acid–conjugated fiber meshes. Specifically, metabolic activity, projected cell area, and cell aspect ratio were all elevated relative to cells seeded on polycaprolactone and unmodified chitosan–polycaprolactone meshes. These results demonstrate a flexible two-step process for creating bioactive electrospun fiber meshes.
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Affiliation(s)
- Prasad Vaidya
- Department of Chemical Engineering, Virginia Tech, Blacksburg, VA, USA
| | - Tijana Grove
- Department of Chemistry, Virginia Tech, Blacksburg, VA, USA
| | - Kevin J Edgar
- Department of Sustainable Biomaterials, Virginia Tech, Blacksburg, VA, USA
| | - Aaron S Goldstein
- Department of Chemical Engineering, Virginia Tech, Blacksburg, VA, USA
- School of Biomedical Engineering and Sciences, Virginia Tech, Blacksburg, VA, USA
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Patel JJ, Flanagan CL, Hollister SJ. Bone Morphogenetic Protein-2 Adsorption onto Poly-ɛ-caprolactone Better Preserves Bioactivity In Vitro and Produces More Bone In Vivo than Conjugation Under Clinically Relevant Loading Scenarios. Tissue Eng Part C Methods 2015; 21:489-98. [PMID: 25345571 DOI: 10.1089/ten.tec.2014.0377] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND One strategy to reconstruct large bone defects is to prefabricate a vascularized flap by implanting a biomaterial scaffold with associated biologics into the latissimus dorsi and then transplanting this construct to the defect site after a maturation period. This strategy, similar to all clinically and regulatory feasible biologic approaches to surgical reconstruction, requires the ability to quickly (<1 h within an operating room) and efficiently bind biologics to scaffolds. It also requires the ability to localize biologic delivery. In this study, we investigated the efficacy of binding bone morphogenetic protein-2 (BMP2) to poly-ɛ-caprolactone (PCL) using adsorption and conjugation as a function of time. METHODS BMP2 was adsorbed (Ads) or conjugated (Conj) to PCL scaffolds with the same three-dimensional printed architecture while altering exposure time (0.5, 1, 5, and 16 h), temperature (4°C, 23°C), and BMP2 concentration (1.4, 5, 20, and 65 μg/mL). The in vitro release was quantified, and C2C12 cell alkaline phosphatase (ALP) expression was used to confirm bioactivity. Scaffolds with either 65 or 20 μg/mL Ads or Conj BMP2 for 1 h at 23°C were implanted subcutaneously in mice to evaluate in vivo bone regeneration. Micro-computed tomography, compression testing, and histology were performed to characterize bone regeneration. RESULTS After 1 h exposure to 65 μg/mL BMP2 at 23°C, Conj and Ads resulted in 12.83 ± 1.78 and 10.78 ± 1.49 μg BMP2 attached, respectively. Adsorption resulted in a positive ALP response and had a small burst release; whereas conjugation provided a sustained release with negligible ALP production, indicating that the conjugated BMP2 may not be bioavailable. Adsorbed 65 μg/mL BMP2 solution resulted in the greatest regenerated bone volume (15.0 ± 3.0 mm³), elastic modulus (20.1 ± 3.0 MPa), and %bone ingrowth in the scaffold interior (17.2% ± 5.4%) when compared with conjugation. CONCLUSION Adsorption may be optimal for the clinical application of prefabricating bone flaps due to BMP2 binding in a short exposure time, retained BMP2 bioactivity, and bone growth adhering to scaffold geometry and into pores with healthy marrow development.
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Affiliation(s)
- Janki J Patel
- Department of Biomedical Engineering, University of Michigan , Ann Arbor, Michigan
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Kim J, Lin B, Kim S, Choi B, Evseenko D, Lee M. TGF-β1 conjugated chitosan collagen hydrogels induce chondrogenic differentiation of human synovium-derived stem cells. J Biol Eng 2015; 9:1. [PMID: 25745515 PMCID: PMC4350967 DOI: 10.1186/1754-1611-9-1] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2014] [Accepted: 12/24/2014] [Indexed: 12/27/2022] Open
Abstract
Background Unlike bone tissue, articular cartilage regeneration has not been very successful and has many challenges ahead. We have previously developed injectable hydrogels using photopolymerizable chitosan (MeGC) that supported growth of chondrocytes. In this study, we demonstrate a biofunctional hydrogel for specific use in cartilage regeneration by conjugating transforming growth factor-β1 (TGF-β1), a well-documented chondrogenic factor, to MeGC hydrogels impregnating type II collagen (Col II), one of the major cartilaginous extracellular matrix (ECM) components. Results TGF-β1 was delivered from MeGC hydrogels in a controlled manner with reduced burst release by chemically conjugating the protein to MeGC. The hydrogel system did not compromise viability of encapsulated human synovium-derived mesenchymal stem cells (hSMSCs). Col II impregnation and TGF-β1 delivery significantly enhanced cellular aggregation and deposition of cartilaginous ECM by the encapsulated cells, compared with pure MeGC hydrogels. Conclusions This study demonstrates successful engineering of a biofunctional hydrogel with a specific microenvironment tailored to promote chondrogenesis. This hydrogel system can provide promising efficacious therapeutics in the treatment of cartilage defects. Electronic supplementary material The online version of this article (doi:10.1186/1754-1611-9-1) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Jinku Kim
- Department of Bio and Chemical Engineering, Hongik University, Sejong, 339-701 South Korea
| | - Brian Lin
- Division of Advanced Prosthodontics, University of California, Los Angeles, CA 90095 USA
| | - Soyon Kim
- Department of Bioengineering, University of California, Los Angeles, CA 90095 USA
| | - Bogyu Choi
- Division of Advanced Prosthodontics, University of California, Los Angeles, CA 90095 USA
| | - Denis Evseenko
- Department of Orthopaedic Surgery, University of California, Los Angeles, CA 90095 USA
| | - Min Lee
- Division of Advanced Prosthodontics, University of California, Los Angeles, CA 90095 USA ; Department of Bioengineering, University of California, Los Angeles, CA 90095 USA
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