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Trébol J, Georgiev-Hristov T, Pascual-Miguelañez I, Guadalajara H, García-Arranz M, García-Olmo D. Stem cell therapy applied for digestive anastomosis: Current state and future perspectives. World J Stem Cells 2022; 14:117-141. [PMID: 35126832 PMCID: PMC8788180 DOI: 10.4252/wjsc.v14.i1.117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 06/21/2021] [Accepted: 12/31/2021] [Indexed: 02/06/2023] Open
Abstract
BACKGROUND Digestive tract resections are usually followed by an anastomosis. Anastomotic leakage, normally due to failed healing, is the most feared complication in digestive surgery because it is associated with high morbidity and mortality. Despite technical and technological advances and focused research, its rates have remained almost unchanged the last decades. In the last two decades, stem cells (SCs) have been shown to enhance healing in animal and human studies; hence, SCs have emerged since 2008 as an alternative to improve anastomoses outcomes.
AIM To summarise the published knowledge of SC utilisation as a preventative tool for hollow digestive viscera anastomotic or suture leaks.
METHODS PubMed, Science Direct, Scopus and Cochrane searches were performed using the key words “anastomosis”, “colorectal/colonic anastomoses”, “anastomotic leak”, “stem cells”, “progenitor cells”, “cellular therapy” and “cell therapy” in order to identify relevant articles published in English and Spanish during the years of 2000 to 2021. Studies employing SCs, performing digestive anastomoses in hollow viscera or digestive perforation sutures and monitoring healing were finally included. Reference lists from the selected articles were reviewed to identify additional pertinent articles.
Given the great variability in the study designs, anastomotic models, interventions (SCs, doses and vehicles) and outcome measures, performing a reliable meta-analysis was considered impossible, so we present the studies, their results and limitations.
RESULTS Eighteen preclinical studies and three review papers were identified; no clinical studies have been published and there are no registered clinical trials. Experimental studies, mainly in rat and porcine models and occasionally in very adverse conditions such as ischaemia or colitis, have been demonstrated SCs as safe and have shown some encouraging morphological, functional and even clinical results. Mesenchymal SCs are mostly employed, and delivery routes are mainly local injections and cell sheets followed by biosutures (sutures coated by SCs) or purely topical. As potential weaknesses, animal models need to be improved to make them more comparable and equivalent to clinical practice, and the SC isolation processes need to be standardised. There is notable heterogeneity in the studies, making them difficult to compare. Further investigations are needed to establish the indications, the administration system, potential adjuvants, the final efficacy and to confirm safety and exclude definitively oncological concerns.
CONCLUSION The future role of SC therapy to induce healing processes in digestive anastomoses/sutures still needs to be determined and seems to be currently far from clinical use.
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Affiliation(s)
- Jacobo Trébol
- Servicio de Cirugía General y del Aparato Digestivo, Complejo Asistencial Universitario de Salamanca, Salamanca 37007, Spain
- Departamento de Anatomía e Histología Humanas, Universidad de Salamanca, Salamanca 37007, Spain
| | - Tihomir Georgiev-Hristov
- Servicio de Cirugía General y del Aparato Digestivo, Hospital General Universitario de Villalba, Madrid 28400, Spain
| | - Isabel Pascual-Miguelañez
- Servicio de Cirugía General y del Aparato Digestivo, Hospital Universitario La Paz, Madrid 28046, Spain
| | - Hector Guadalajara
- Servicio de Cirugía General y del Aparato Digestivo, Hospital Universitario Fundación Jiménez Díaz, Madrid 28040, Spain
| | - Mariano García-Arranz
- Grupo de Investigación en Nuevas Terapias, Instituto de Investigación Sanitaria-Fundación Jiménez Díaz, Madrid 28040, Spain
- Departamento de Cirugía, Universidad Autónoma de Madrid, Madrid 28029, Spain
| | - Damian García-Olmo
- Departamento de Cirugía, Universidad Autónoma de Madrid, Madrid 28029, Spain
- Servicio de Cirugía General y del Aparato Digestivo, Hospital Universitario Fundación Jiménez Díaz y Grupo Quiron-Salud Madrid, Madrid 28040, Spain
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Phan PT, Hoang TT, Thai MT, Low H, Davies J, Lovell NH, Do TN. Smart surgical sutures using soft artificial muscles. Sci Rep 2021; 11:22420. [PMID: 34789808 PMCID: PMC8599709 DOI: 10.1038/s41598-021-01910-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 11/08/2021] [Indexed: 02/06/2023] Open
Abstract
Wound closure with surgical sutures is a critical challenge for flexible endoscopic surgeries. Substantial efforts have been introduced to develop functional and smart surgical sutures to either monitor wound conditions or ease the complexity of knot tying. Although research interests in smart sutures by soft robotic technologies have emerged for years, it is challenging to develop a soft robotic structure that possesses a similar physical structure as conventional sutures while offering a self-tightening knot or anchor to close the wound. This paper introduces a new concept of smart sutures that can be programmed to achieve desired and uniform tension distribution while offering self-tightening knots or automatically deploying secured anchors. The core technology is a soft hydraulic artificial muscle that can be elongated and contracted under applied fluid pressure. Each suture is equipped with a pressure locking mechanism to hold its temporary elongated state and to induce self-shrinking ability. The puncturing and holding force for the smart sutures with anchors are examined. Ex-vivo experiments on fresh porcine stomach and colon demonstrate the usefulness of the new smart sutures. The new approaches are expected to pave the way for the further development of smart sutures that will benefit research, training, and commercialization in the surgical field.
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Affiliation(s)
- Phuoc Thien Phan
- Graduate School of Biomedical Engineering, Faculty of Engineering, University of New South Wales (UNSW), Sydney, NSW, 2052, Australia
| | - Trung Thien Hoang
- Graduate School of Biomedical Engineering, Faculty of Engineering, University of New South Wales (UNSW), Sydney, NSW, 2052, Australia
| | - Mai Thanh Thai
- Graduate School of Biomedical Engineering, Faculty of Engineering, University of New South Wales (UNSW), Sydney, NSW, 2052, Australia
| | - Harrison Low
- Graduate School of Biomedical Engineering, Faculty of Engineering, University of New South Wales (UNSW), Sydney, NSW, 2052, Australia
| | - James Davies
- Graduate School of Biomedical Engineering, Faculty of Engineering, University of New South Wales (UNSW), Sydney, NSW, 2052, Australia
| | - Nigel H Lovell
- Graduate School of Biomedical Engineering, Faculty of Engineering, University of New South Wales (UNSW), Sydney, NSW, 2052, Australia
| | - Thanh Nho Do
- Graduate School of Biomedical Engineering, Faculty of Engineering, University of New South Wales (UNSW), Sydney, NSW, 2052, Australia.
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Uehara K, Zhao C, Gingery A, Thoreson AR, An KN, Amadio PC. The effect of fibrin formulation on cell migration in an in vitro tendon repair model. J Orthop Sci 2021; 26:902-907. [PMID: 32814661 PMCID: PMC7884481 DOI: 10.1016/j.jos.2020.07.017] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/10/2019] [Revised: 05/18/2020] [Accepted: 07/15/2020] [Indexed: 02/09/2023]
Abstract
BACKGROUND The purpose of this study was to determine the effect of fibrinogen concentration on cell viability and migration in a tissue culture tendon healing model. METHODS Forty-eight canine flexor digitorum profundus tendons were randomly divided into three groups. In each group the tendons were lacerated and repaired augmented with a canine bone marrow stromal cell seeded fibrin interposition patch using either 5 mg/ml fibrinogen and 25 U/ml thrombin (physiological as a control), 40 mg/ml fibrinogen and 250 U/ml thrombin (low adhesive), or 80 mg/ml fibrinogen and 250 U/ml thrombin (high adhesive). The sutured tendons were cultured for two or four weeks. RESULTS Failure load was not significantly different among the groups. Cell-labeling staining showed that the stromal cells migrated across the gap in the control and low adhesive groups, but there was no cell migration in the high adhesive group at two weeks. CONCLUSION A high fibrinogen concentration in a fibrin patch or glue may impede early cell migration. LEVEL OF EVIDENCE Not applicable because this study was a laboratory study.
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Affiliation(s)
- Kosuke Uehara
- Orthopaedic Biomechanics and Tendon and Soft Tissue Biology Laboratories, Division of Orthopedic Research, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA
| | - Chunfeng Zhao
- Orthopaedic Biomechanics and Tendon and Soft Tissue Biology Laboratories, Division of Orthopedic Research, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA
| | - Anne Gingery
- Orthopaedic Biomechanics and Tendon and Soft Tissue Biology Laboratories, Division of Orthopedic Research, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA
| | - Andrew R Thoreson
- Orthopaedic Biomechanics and Tendon and Soft Tissue Biology Laboratories, Division of Orthopedic Research, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA
| | - Kai-Nan An
- Orthopaedic Biomechanics and Tendon and Soft Tissue Biology Laboratories, Division of Orthopedic Research, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA
| | - Peter C Amadio
- Orthopaedic Biomechanics and Tendon and Soft Tissue Biology Laboratories, Division of Orthopedic Research, Mayo Clinic, 200 First Street SW, Rochester, MN, 55905, USA.
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de la Harpe KM, Kondiah PPD, Marimuthu T, Choonara YE. Advances in carbohydrate-based polymers for the design of suture materials: A review. Carbohydr Polym 2021; 261:117860. [PMID: 33766349 DOI: 10.1016/j.carbpol.2021.117860] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2021] [Revised: 02/12/2021] [Accepted: 02/22/2021] [Indexed: 12/25/2022]
Abstract
Suture materials constitute one of the largest biomedical material groups with a huge global market of $ 1.3 billion annually and employment in over 12 million procedures per year. Suture materials have radically evolved over the years, from basic strips of linen to more advanced synthetic polymer sutures. Yet, the journey to the ideal suture material is far from over and we now stand on the brink of a new era of improved suture materials with greater safety and efficacy. This next step in the evolutionary timeline of suture materials, involves the use of natural, carbohydrate polymers that have, until recent years, never before been considered for suture material applications. This review exposes the latest and most important advancements in suture material development while digging deep into how natural, carbohydrate polymers can serve to advance this field.
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Affiliation(s)
- Kara M de la Harpe
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Science, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, 7 York Road, Parktown, 2193, South Africa
| | - Pierre P D Kondiah
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Science, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, 7 York Road, Parktown, 2193, South Africa
| | - Thashree Marimuthu
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Science, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, 7 York Road, Parktown, 2193, South Africa
| | - Yahya E Choonara
- Wits Advanced Drug Delivery Platform Research Unit, Department of Pharmacy and Pharmacology, School of Therapeutic Science, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, 7 York Road, Parktown, 2193, South Africa.
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Centeno-Cerdas C, Jarquín-Cordero M, Chávez MN, Hopfner U, Holmes C, Schmauss D, Machens HG, Nickelsen J, Egaña JT. Development of photosynthetic sutures for the local delivery of oxygen and recombinant growth factors in wounds. Acta Biomater 2018; 81:184-194. [PMID: 30287280 DOI: 10.1016/j.actbio.2018.09.060] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2018] [Revised: 09/27/2018] [Accepted: 09/28/2018] [Indexed: 02/06/2023]
Abstract
Surgical sutures represent the gold standard for wound closure, however, their main purpose is still limited to a mechanical function rather than playing a bioactive role. Since oxygen and pro-regenerative growth factors have been broadly described as key players for the healing process, in this study we evaluated the feasibility of generating photosynthetic sutures that, in addition to mechanical fixation, could locally and stably release oxygen and recombinant human growth factors (VEGF, PDGF-BB, or SDF-1α) at the wound site. Here, photosynthetic genetically modified microalgae were seeded in commercially available sutures and their distribution and proliferation capacity was evaluated. Additionally, the mechanical properties of seeded sutures were compared to unseeded controls that showed no significant differences. Oxygen production, as well as recombinant growth factor release was quantified in vitro over time, and confirmed that photosynthetic sutures are indeed a feasible approach for the local delivery of bioactive molecules. Finally, photosynthetic sutures were tested in order to evaluate their resistance to mechanical stress and freezing. Significant stability was observed in both conditions, and the feasibility of their use in the clinical practice was therefore confirmed. Our results suggest that photosynthetic gene therapy could be used to produce a new generation of bioactive sutures with improved healing capacities. STATEMENT OF SIGNIFICANCE: Disruption of the vascular network is intrinsic to trauma and surgery, and consequently, wound healing is characterized by diminished levels of blood perfusion. Among all the blood components, oxygen and pro-regenerative growth factors have been broadly described as key players for the healing process. Therefore, in this study we evaluated the feasibility of generating photosynthetic sutures that, in addition to mechanical fixation, could locally and stably release oxygen and recombinant human growth factors at the wound site. This novel concept has never been explored before for this type of material and represents the first attempt to create a new generation of bioactive sutures with improved regenerative capabilities.
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Affiliation(s)
- Carolina Centeno-Cerdas
- Department of Plastic Surgery and Hand Surgery, University Hospital rechts der Isar, Technische Universität München, Germany; Biotechnology Research Center, Instituto Tecnológico de Costa Rica, Cartago, Costa Rica
| | - Montserrat Jarquín-Cordero
- Biotechnology Research Center, Instituto Tecnológico de Costa Rica, Cartago, Costa Rica; Molekulare Pflanzenwissenschaften, Biozentrum Ludwig-Maximilians-Universität München, Planegg-Martinsried, Germany
| | - Myra Noemi Chávez
- FONDAP Center for Genome Regulation, Faculty of Science, Universidad de Chile, Santiago, Chile; Advanced Center for Chronic Disease (ACCDiS) & Center for Molecular Studies of the Cell (CEMC), Facultad de Ciencias Químicas y Farmacéuticas & Facultad de Medicina, Universidad de Chile, Santiago, Chile
| | - Ursula Hopfner
- Department of Plastic Surgery and Hand Surgery, University Hospital rechts der Isar, Technische Universität München, Germany
| | - Christopher Holmes
- Institute for Biological and Medical Engineering, Schools of Engineering, Biological Sciences and Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Daniel Schmauss
- Department of Plastic Surgery and Hand Surgery, University Hospital rechts der Isar, Technische Universität München, Germany; Division of Plastic, Reconstructive and Aesthetic Surgery, Ospedale Regionale di Lugano, Ente Ospedaliero Cantonale, Lugano, Switzerland
| | - Hans-Günther Machens
- Department of Plastic Surgery and Hand Surgery, University Hospital rechts der Isar, Technische Universität München, Germany
| | - Jörg Nickelsen
- Molekulare Pflanzenwissenschaften, Biozentrum Ludwig-Maximilians-Universität München, Planegg-Martinsried, Germany
| | - José Tomás Egaña
- Institute for Biological and Medical Engineering, Schools of Engineering, Biological Sciences and Medicine, Pontificia Universidad Católica de Chile, Santiago, Chile.
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6
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Hansen KJ, Laflamme MA, Gaudette GR. Development of a Contractile Cardiac Fiber From Pluripotent Stem Cell Derived Cardiomyocytes. Front Cardiovasc Med 2018; 5:52. [PMID: 29942806 PMCID: PMC6004416 DOI: 10.3389/fcvm.2018.00052] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2017] [Accepted: 05/04/2018] [Indexed: 01/25/2023] Open
Abstract
Stem cell therapy has the potential to regenerate cardiac function after myocardial infarction. In this study, we sought to examine if fibrin microthread technology could be leveraged to develop a contractile fiber from human pluripotent stem cell derived cardiomyocytes (hPS-CM). hPS-CM seeded onto fibrin microthreads were able to adhere to the microthread and began to contract seven days after initial seeding. A digital speckle tracking algorithm was applied to high speed video data (>60 fps) to determine contraction behaviour including beat frequency, average and maximum contractile strain, and the principal angle of contraction of hPS-CM contracting on the microthreads over 21 days. At day 7, cells seeded on tissue culture plastic beat at 0.83 ± 0.25 beats/sec with an average contractile strain of 4.23±0.23%, which was significantly different from a beat frequency of 1.11 ± 0.45 beats/sec and an average contractile strain of 3.08±0.19% at day 21 (n = 18, p < 0.05). hPS-CM seeded on microthreads beat at 0.84 ± 0.15 beats/sec with an average contractile strain of 3.56±0.22%, which significantly increased to 1.03 ± 0.19 beats/sec and 4.47±0.29%, respectively, at 21 days (n = 18, p < 0.05). At day 7, 27% of the cells had a principle angle of contraction within 20 degrees of the microthread, whereas at day 21, 65% of hPS-CM were contracting within 20 degrees of the microthread (n = 17). Utilizing high speed calcium transient data (>300 fps) of Fluo-4AM loaded hPS-CM seeded microthreads, conduction velocities significantly increased from 3.69 ± 1.76 cm/s at day 7 to 24.26 ± 8.42 cm/s at day 21 (n = 5-6, p < 0.05). hPS-CM seeded microthreads exhibited positive expression for connexin 43, a gap junction protein, between cells. These data suggest that the fibrin microthread is a suitable scaffold for hPS-CM attachment and contraction. In addition, extended culture allows cells to contract in the direction of the thread, suggesting alignment of the cells in the microthread direction.
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Affiliation(s)
- Katrina J. Hansen
- Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA, United States
| | - Michael A. Laflamme
- Toronto General Hospital Research Institute, McEwen Centre for Regenerative Medicine, University Health Network, Toronto, ON, Canada
| | - Glenn R. Gaudette
- Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA, United States
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7
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Laurén P, Somersalo P, Pitkänen I, Lou YR, Urtti A, Partanen J, Seppälä J, Madetoja M, Laaksonen T, Mäkitie A, Yliperttula M. Nanofibrillar cellulose-alginate hydrogel coated surgical sutures as cell-carrier systems. PLoS One 2017; 12:e0183487. [PMID: 28829830 PMCID: PMC5567492 DOI: 10.1371/journal.pone.0183487] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2017] [Accepted: 08/05/2017] [Indexed: 12/18/2022] Open
Abstract
Hydrogel nanomaterials, especially those that are of non-human and non-animal origins, have great potential in biomedical and pharmaceutical sciences due to their versatility and inherent soft-tissue like properties. With the ability to simulate native tissue function, hydrogels are potentially well suited for cellular therapy applications. In this study, we have fabricated nanofibrillar cellulose-alginate (NFCA) suture coatings as biomedical devices to help overcome some of the limitations related to cellular therapy, such as low cell survivability and distribution out of target tissue. The addition of sodium alginate 8% (w/v) increased the NFCA hydrogel viscosity, storage and loss moduli by slightly under one order of magnitude, thus contributing significantly to coating strength. Confocal microscopy showed nearly 100% cell viability throughout the 2-week incubation period within and on the surface of the coating. Additionally, typical morphologies in the dual cell culture of spheroid forming HepG2 and monolayer type SK-HEP-1 were observed. Twelve out of 14 NFCA coated surgical sutures remained intact during the suturing operation with various mice and rat tissue; however, partial peeling off was observed in 2 of the coated sutures. We conclude that NFCA suture coatings could perform as cell-carrier systems for cellular based therapy and post-surgical treatment.
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Affiliation(s)
- Patrick Laurén
- Division of Pharmaceutical Biosciences, Centre for Drug Research, Faculty of Pharmacy, University of Helsinki, Helsinki, Finland
| | - Petter Somersalo
- Division of Pharmaceutical Biosciences, Centre for Drug Research, Faculty of Pharmacy, University of Helsinki, Helsinki, Finland
| | - Irina Pitkänen
- Department of Engineering Design and Production, School of Engineering, Aalto University, Espoo, Finland
| | - Yan-Ru Lou
- Division of Pharmaceutical Biosciences, Centre for Drug Research, Faculty of Pharmacy, University of Helsinki, Helsinki, Finland
| | - Arto Urtti
- Division of Pharmaceutical Biosciences, Centre for Drug Research, Faculty of Pharmacy, University of Helsinki, Helsinki, Finland
- School of Pharmacy, University of Eastern Finland, Kuopio, Finland
| | - Jouni Partanen
- Department of Engineering Design and Production, School of Engineering, Aalto University, Espoo, Finland
| | - Jukka Seppälä
- Department of Engineering Design and Production, School of Engineering, Aalto University, Espoo, Finland
| | | | - Timo Laaksonen
- Division of Pharmaceutical Biosciences, Centre for Drug Research, Faculty of Pharmacy, University of Helsinki, Helsinki, Finland
- Department of Chemistry and Bioengineering, Tampere University of Technology, Tampere, Finland
| | - Antti Mäkitie
- Department of Otorhinolaryngology—Head and Neck Surgery, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Marjo Yliperttula
- Division of Pharmaceutical Biosciences, Centre for Drug Research, Faculty of Pharmacy, University of Helsinki, Helsinki, Finland
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Abhari RE, Martins JA, Morris HL, Mouthuy PA, Carr A. Synthetic sutures: Clinical evaluation and future developments. J Biomater Appl 2017; 32:410-421. [PMID: 28714329 DOI: 10.1177/0885328217720641] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Today's sutures are the result of a 4000-year innovation process with regard to their materials and manufacturing techniques, yet little has been done to enhance the therapeutic value of the suture itself. In this review, we explore the historical development, regulatory database and clinical literature of sutures to gain a fuller picture of suture advances to date. First, we examine historical shifts in suture manufacturing companies and review suture regulatory databases to understand the forces driving suture development. Second, we gather the existing clinical evidence of suture efficacy from reviewing the clinical literature and the Food and Drug Administration database in order to identify to what extent sutures have been clinically evaluated and the key clinical areas that would benefit from improved suture materials. Finally, we apply tissue engineering and regenerative medicine design hypotheses to suture materials to identify routes by which bioactive sutures can be designed and passed through regulatory hurdles, to improve surgical outcomes. Our review of the clinical literature revealed that many of the sutures currently in use have been available for decades, yet have never been clinically evaluated. Since suture design and development is industry driven, incremental modifications have allowed for a steady outflow of products while maintaining a safe regulatory position and limiting costs. Until recently, there has been little academic interest in suture development, however the rise of regenerative medicine strategies is shifting the suture paradigm from an inert material, which mechanically approximates tissue, to a bioactive material, which also actively promotes cell-directed repair and a positive healing response. These materials hold significant therapeutic potential, but could be associated with an increased regulatory burden, cost, and clinical evaluation compared with current devices.
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Affiliation(s)
- Roxanna E Abhari
- Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Sciences, University of Oxford, Old Road, Oxford, UK
| | - Joana A Martins
- Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Sciences, University of Oxford, Old Road, Oxford, UK
| | - Hayley L Morris
- Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Sciences, University of Oxford, Old Road, Oxford, UK
| | - Pierre-Alexis Mouthuy
- Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Sciences, University of Oxford, Old Road, Oxford, UK
| | - Andrew Carr
- Nuffield Department of Orthopaedics, Rheumatology, and Musculoskeletal Sciences, University of Oxford, Old Road, Oxford, UK
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9
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Antanavičiūtė I, Šimatonis L, Ulčinas O, Gadeikytė A, Abakevičienė B, Tamulevičius S, Mikalayeva V, Skeberdis VA, Stankevičius E, Tamulevičius T. Femtosecond laser micro-machined polyimide films for cell scaffold applications. J Tissue Eng Regen Med 2017; 12:e760-e773. [PMID: 27943611 DOI: 10.1002/term.2376] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Revised: 10/07/2016] [Accepted: 12/06/2016] [Indexed: 01/08/2023]
Abstract
Engineering of sophisticated synthetic 3D scaffolds that allow controlling behaviour and location of the cells requires advanced micro/nano-fabrication techniques. Ultrafast laser micro-machining employing a 1030-nm wavelength Yb:KGW femtosecond laser and a micro-fabrication workstation for micro-machining of commercially available 12.7 and 25.4 μm thickness polyimide (PI) film was applied. Mechanical properties of the fabricated scaffolds, i.e. arrays of differently spaced holes, were examined via custom-built uniaxial micro-tensile testing and finite element method simulations. We demonstrate that experimental micro-tensile testing results could be numerically simulated and explained by two-material model, assuming that 2-6 μm width rings around the holes possessed up to five times higher Young's modulus and yield stress compared with the rest of the laser intacted PI film areas of 'dog-bone'-shaped specimens. That was attributed to material modification around the micro-machined holes in the vicinity of the position of the focused laser beam track during trepanning drilling. We demonstrate that virgin PI films provide a suitable environment for the mobility, proliferation and intercellular communication of human bone marrow mesenchymal stem cells, and discuss how cell behaviour varies on the micro-machined PI films with holes of different diameters (3.1, 8.4 and 16.7 μm) and hole spacing (30, 35, 40 and 45 μm). We conclude that the holes of 3.1 μm diameter were sufficient for metabolic and genetic communication through membranous tunneling tubes between cells residing on the opposite sides of PI film, but prevented the trans-migration of cells through the holes. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Ieva Antanavičiūtė
- Institute of Cardiology of Lithuanian University of Health Sciences, Sukilėlių Ave. 17, LT-50009, Lithuania
| | - Linas Šimatonis
- Institute of Materials Science of Kaunas University of Technology, K. Baršausko, Str. 59, LT-51423, Kaunas, Lithuania
| | - Orestas Ulčinas
- Institute of Materials Science of Kaunas University of Technology, K. Baršausko, Str. 59, LT-51423, Kaunas, Lithuania
| | - Aušra Gadeikytė
- Institute of Materials Science of Kaunas University of Technology, K. Baršausko, Str. 59, LT-51423, Kaunas, Lithuania
| | - Brigita Abakevičienė
- Institute of Materials Science of Kaunas University of Technology, K. Baršausko, Str. 59, LT-51423, Kaunas, Lithuania
| | - Sigitas Tamulevičius
- Institute of Materials Science of Kaunas University of Technology, K. Baršausko, Str. 59, LT-51423, Kaunas, Lithuania
| | - Valeryia Mikalayeva
- Institute of Cardiology of Lithuanian University of Health Sciences, Sukilėlių Ave. 17, LT-50009, Lithuania
| | - Vytenis Arvydas Skeberdis
- Institute of Cardiology of Lithuanian University of Health Sciences, Sukilėlių Ave. 17, LT-50009, Lithuania
| | - Edgaras Stankevičius
- Institute of Physiology and Pharmacology of Lithuanian University of Health Sciences, A. Mickevičiaus Str. 9, LT-44307, Kaunas, Lithuania
| | - Tomas Tamulevičius
- Institute of Materials Science of Kaunas University of Technology, K. Baršausko, Str. 59, LT-51423, Kaunas, Lithuania
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10
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Gershlak JR, Hernandez S, Fontana G, Perreault LR, Hansen KJ, Larson SA, Binder BYK, Dolivo DM, Yang T, Dominko T, Rolle MW, Weathers PJ, Medina-Bolivar F, Cramer CL, Murphy WL, Gaudette GR. Crossing kingdoms: Using decellularized plants as perfusable tissue engineering scaffolds. Biomaterials 2017; 125:13-22. [PMID: 28222326 PMCID: PMC5388455 DOI: 10.1016/j.biomaterials.2017.02.011] [Citation(s) in RCA: 171] [Impact Index Per Article: 24.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2016] [Revised: 02/08/2017] [Accepted: 02/09/2017] [Indexed: 11/23/2022]
Abstract
Despite significant advances in the fabrication of bioengineered scaffolds for tissue engineering, delivery of nutrients in complex engineered human tissues remains a challenge. By taking advantage of the similarities in the vascular structure of plant and animal tissues, we developed decellularized plant tissue as a prevascularized scaffold for tissue engineering applications. Perfusion-based decellularization was modified for different plant species, providing different geometries of scaffolding. After decellularization, plant scaffolds remained patent and able to transport microparticles. Plant scaffolds were recellularized with human endothelial cells that colonized the inner surfaces of plant vasculature. Human mesenchymal stem cells and human pluripotent stem cell derived cardiomyocytes adhered to the outer surfaces of plant scaffolds. Cardiomyocytes demonstrated contractile function and calcium handling capabilities over the course of 21 days. These data demonstrate the potential of decellularized plants as scaffolds for tissue engineering, which could ultimately provide a cost-efficient, "green" technology for regenerating large volume vascularized tissue mass.
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Affiliation(s)
- Joshua R Gershlak
- Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA, United States
| | - Sarah Hernandez
- Biology and Biotechnology, Worcester Polytechnic Institute, Worcester, MA, United States
| | - Gianluca Fontana
- Orthopedics and Rehabilitation, University of Wisconsin School of Medicine and Public Health, Madison, WI, United States
| | - Luke R Perreault
- Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA, United States
| | - Katrina J Hansen
- Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA, United States
| | - Sara A Larson
- Biology and Biotechnology, Worcester Polytechnic Institute, Worcester, MA, United States
| | - Bernard Y K Binder
- Department of Surgery, University of Wisconsin School of Medicine and Public Health, Madison, WI, United States
| | - David M Dolivo
- Biology and Biotechnology, Worcester Polytechnic Institute, Worcester, MA, United States
| | - Tianhong Yang
- Department of Biological Sciences, Arkansas State University, Jonesboro, AR, United States; Arkansas Biosciences Institute, Arkansas State University, Jonesboro, AR, United States
| | - Tanja Dominko
- Biology and Biotechnology, Worcester Polytechnic Institute, Worcester, MA, United States; Center for Biomedical Sciences and Engineering, University of Nova Gorica, Slovenia
| | - Marsha W Rolle
- Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA, United States
| | - Pamela J Weathers
- Biology and Biotechnology, Worcester Polytechnic Institute, Worcester, MA, United States
| | - Fabricio Medina-Bolivar
- Department of Biological Sciences, Arkansas State University, Jonesboro, AR, United States; Arkansas Biosciences Institute, Arkansas State University, Jonesboro, AR, United States
| | - Carole L Cramer
- Department of Biological Sciences, Arkansas State University, Jonesboro, AR, United States; Arkansas Biosciences Institute, Arkansas State University, Jonesboro, AR, United States
| | - William L Murphy
- Orthopedics and Rehabilitation, University of Wisconsin School of Medicine and Public Health, Madison, WI, United States; Biomedical Engineering, University of Wisconsin-Madison, Madison, WI, United States; Material Sciences and Engineering, University of Wisconsin-Madison, Madison, WI, United States
| | - Glenn R Gaudette
- Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA, United States.
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11
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Li Y, Tian S, Lei I, Liu L, Ma P, Wang Z. Transplantation of multipotent Isl1+ cardiac progenitor cells preserves infarcted heart function in mice. Am J Transl Res 2017; 9:1530-1542. [PMID: 28386378 PMCID: PMC5376043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Accepted: 01/18/2017] [Indexed: 06/07/2023]
Abstract
Cell-based cardiac therapy is a promising therapeutic strategy to restore heart function after myocardial infarction (MI). However, the cell type selection and ensuing effects remain controversial. Here, we intramyocardially injected Isl1+ cardiac progenitor cells (CPCs) derived from EGFP/luciferase double-tagged mouse embryonic stem (dt-mES) cells with vehicle (fibrin gel) or phosphate-buffered saline (PBS) into the infarcted area in nude mice to assess the contribution of CPCs to the recovery of cardiac function post-MI. Our results showed that Isl1+ CPCs differentiated normally into three cardiac lineages (cardiomyocytes (CMs), endothelial cells and smooth muscle cells) both on cell culture plates and in fibrin gel. Cell retention was significantly increased when the transplanted cells were injected with vehicle. Importantly, 28 days after injection, CPCs were observed to differentiate into CMs within the infarcted area. Moreover, numerous CD31+ endothelial cells derived from endogenous revascularization and differentiation of the injected CPCs were detected. SMMHC-, Ki67- and CX-43-positive cells were identified in the injected CPC population, further demonstrating the proliferation, differentiation and integration of the transplanted CPCs in host cells. Furthermore, animal hearts injected with CPCs showed increased angiogenesis, decreased infarct size, and improved heart function. In conclusion, our studies showed that Isl1+ CPCs, when combined with a suitable vehicle, can produce notable therapeutic effects in the infarcted heart, suggesting that CPCs might be an ideal cell source for cardiac therapy.
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Affiliation(s)
- Yunpeng Li
- State Key Laboratory of Military Stomatology & National Clinical Research Center for Oral Diseases & Shaanxi Clinical Research Center for Oral Diseases, Department of Oral and Maxillofacial Surgery, School of Stomatology, The Fourth Military Medical UniversityXian 710032, Shaanxi, China
- Department of Cardiac Surgery, Cardiovascular Center, The University of MichiganAnn Arbor 48109, MI, USA
| | - Shuo Tian
- Department of Cardiac Surgery, Cardiovascular Center, The University of MichiganAnn Arbor 48109, MI, USA
| | - Ienglam Lei
- Department of Cardiac Surgery, Cardiovascular Center, The University of MichiganAnn Arbor 48109, MI, USA
- Faculty of Health Sciences, University of MacauMacau SAR, China
| | - Liu Liu
- Department of Cardiac Surgery, Cardiovascular Center, The University of MichiganAnn Arbor 48109, MI, USA
| | - Peter Ma
- Department of Biologic and Materials Sciences, Biomedical Engineering, Macromolecular Science and Engineering Center, and Materials Science and Engineering, The University of MichiganAnn Arbor 48109, MI, USA
| | - Zhong Wang
- Department of Cardiac Surgery, Cardiovascular Center, The University of MichiganAnn Arbor 48109, MI, USA
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12
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Tao ZW, Favreau JT, Guyette JP, Hansen KJ, Lessard J, Burford E, Pins GD, Gaudette GR. Delivering stem cells to the healthy heart on biological sutures: effects on regional mechanical function. J Tissue Eng Regen Med 2017; 11:220-230. [PMID: 24753390 PMCID: PMC4664584 DOI: 10.1002/term.1904] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2012] [Revised: 11/04/2013] [Accepted: 03/17/2014] [Indexed: 12/11/2022]
Abstract
Current cardiac cell therapies cannot effectively target and retain cells in a specific area of the heart. Cell-seeded biological sutures were previously developed to overcome this limitation, demonstrating targeted delivery with > 60% cell retention. In this study, both cell-seeded and non-seeded fibrin-based biological sutures were implanted into normal functioning rat hearts to determine the effects on mechanical function and fibrotic response. Human mesenchymal stem cells (hMSCs) were used based on previous work and established cardioprotective effects. Non-seeded or hMSC-seeded sutures were implanted into healthy athymic rat hearts. Before cell seeding, hMSCs were passively loaded with quantum dot nanoparticles. One week after implantation, regional stroke work index and systolic area of contraction (SAC) were evaluated on the epicardial surface above the suture. Cell delivery and retention were confirmed by quantum dot tracking, and the fibrotic tissue area was evaluated. Non-seeded biological sutures decreased SAC near the suture from 0.20 ± 0.01 measured in sham hearts to 0.08 ± 0.02, whereas hMSC-seeded biological sutures dampened the decrease in SAC (0.15 ± 0.02). Non-seeded sutures also displayed a small amount of fibrosis around the sutures (1.0 ± 0.1 mm2 ). Sutures seeded with hMSCs displayed a significant reduction in fibrosis (0.5 ± 0.1 mm2 , p < 0.001), with quantum dot-labelled hMSCs found along the suture track. These results show that the addition of hMSCs attenuates the fibrotic response observed with non-seeded sutures, leading to improved regional mechanics of the implantation region. Copyright © 2014 John Wiley & Sons, Ltd.
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Affiliation(s)
- Ze-Wei Tao
- Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA, USA
| | - John T Favreau
- Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA, USA
| | - Jacques P Guyette
- Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA, USA
| | - Katrina J Hansen
- Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA, USA
| | - Jeffrey Lessard
- Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA, USA
| | - Evans Burford
- Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA, USA
| | - George D Pins
- Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA, USA
| | - Glenn R Gaudette
- Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, MA, USA
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13
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Younesi M, Donmez BO, Islam A, Akkus O. Heparinized collagen sutures for sustained delivery of PDGF-BB: Delivery profile and effects on tendon-derived cells In-Vitro. Acta Biomater 2016; 41:100-9. [PMID: 27240725 DOI: 10.1016/j.actbio.2016.05.036] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2015] [Revised: 05/23/2016] [Accepted: 05/26/2016] [Indexed: 01/30/2023]
Abstract
UNLABELLED Suturing is the standard of repair for lacerated flexor tendons. Past studies focused on delivering growth factors to the repair site by incorporating growth factors to nylon sutures which are commonly used in the repair procedure. However, conjugation of growth factors to nylon or other synthetic sutures is not straightforward. Collagen holds promise as a suture material by way of providing chemical sites for conjugation of growth factors. On the other hand, collagen also needs to be reconstituted as a mechanically robust thread that can be sutured. In this study, we reconstituted collagen solutions as suturable collagen threads by using linear electrochemical compaction. Prolonged release of PDGF-BB (Platelet derived growth factor-BB) was achieved by covalent bonding of heparin to the collagen sutures. Tensile mechanical tests of collagen sutures before and after chemical modification indicated that the strength of sutures following chemical conjugation stages was not compromised. Strength of lacerated tendons sutured with epitendinous collagen sutures (11.2±0.7N) converged to that of the standard nylon suture (14.9±2.9N). Heparin conjugation of collagen sutures didn't affect viability and proliferation of tendon-derived cells and prolonged the PDGF-BB release up to 15days. Proliferation of cells seeded on PDGF-BB incorporated collagen sutures was about 50% greater than those seeded on plain collagen sutures. Collagen that is released to the media by the cells increased by 120% under the effects of PDGF-BB and collagen production by cells was detectable by histology as of day 21. Addition of PDGF-BB to collagen sutures resulted in a moderate decline in the expression of the tendon-associated markers scleraxis, collagen I, tenomodulin, and COMP; however, expression levels were still greater than the cells seeded on collagen gel. The data indicate that the effects of PDGF-BB on tendon-derived cells mainly occur through increased cell proliferation and that longer term studies are needed to confirm whether this proliferation is outweighs the moderate reduction in the expression of tendon-associated genes. STATEMENT OF SIGNIFICANCE A mechanically robust pure collagen suture was fabricated via linear electrocompaction and conjugated with heparin for prolonged delivery of PDFG-BB. Sustained delivery of the PDGF-BB improved the proliferation of tendon derived cells substantially at the expense of a moderate downregulation of tenogenic markers. The collagen threads were functionally applicable as epitendinous sutures when applied to chicken flexor tendons in vitro. Overall, electrocompacted collagen sutures holds potential to improve repair outcome in flexor tendon surgeries by improving cellularity and collagen production through delivery of the PDGF-BB. The bioinductive suture concept can be applied to deliver other growth factors for a wide-array of applications.
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Affiliation(s)
- Mousa Younesi
- Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106, United States
| | - Baris Ozgur Donmez
- Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106, United States
| | - Anowarul Islam
- Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106, United States
| | - Ozan Akkus
- Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106, United States; Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH 44106, United States; Department of Orthopedics, Case Western Reserve University, Cleveland, OH 44106, United States.
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14
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Hansen KJ, Favreau JT, Guyette JP, Tao ZW, Coffin ST, Cunha-Gavidia A, D'Amore B, Perreault LR, Fitzpatrick JP, DeMartino A, Gaudette GR. Functional Effects of Delivering Human Mesenchymal Stem Cell-Seeded Biological Sutures to an Infarcted Heart. Biores Open Access 2016; 5:249-60. [PMID: 27610271 PMCID: PMC5003011 DOI: 10.1089/biores.2016.0026] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Stem cell therapy has the potential to improve cardiac function after myocardial infarction (MI); however, existing methods to deliver cells to the myocardium, including intramyocardial injection, suffer from low engraftment rates. In this study, we used a rat model of acute MI to assess the effects of human mesenchymal stem cell (hMSC)-seeded fibrin biological sutures on cardiac function at 1 week after implant. Biological sutures were seeded with quantum dot (Qdot)-loaded hMSCs for 24 h before implantation. At 1 week postinfarct, the heart was imaged to assess mechanical function in the infarct region. Regional parameters assessed were regional stroke work (RSW) and systolic area of contraction (SAC) and global parameters derived from the pressure waveform. MI (n = 6) significantly decreased RSW (0.026 ± 0.011) and SAC (0.022 ± 0.015) when compared with sham operation (RSW: 0.141 ± 0.009; SAC: 0.166 ± 0.005, n = 6) (p < 0.05). The delivery of unseeded biological sutures to the infarcted hearts did not change regional mechanical function compared with the infarcted hearts (RSW: 0.032 ± 0.004, SAC: 0.037 ± 0.008, n = 6). The delivery of hMSC-seeded sutures exerted a trend toward increase of regional mechanical function compared with the infarcted heart (RSW: 0.057 ± 0.011; SAC: 0.051 ± 0.014, n = 6). Global function showed no significant differences between any group (p > 0.05); however, there was a trend toward improved function with the addition of either unseeded or seeded biological suture. Histology demonstrated that Qdot-loaded hMSCs remained present in the infarcted myocardium after 1 week. Analysis of serial sections of Masson's trichrome staining revealed that the greatest infarct size was in the infarct group (7.0% ± 2.2%), where unseeded (3.8% ± 0.6%) and hMSC-seeded (3.7% ± 0.8%) suture groups maintained similar infarct sizes. Furthermore, the remaining suture area was significantly decreased in the unseeded group compared with that in the hMSC-seeded group (p < 0.05). This study demonstrated that hMSC-seeded biological sutures are a method to deliver cells to the infarcted myocardium and have treatment potential.
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Affiliation(s)
- Katrina J Hansen
- Department of Biomedical Engineering, Worcester Polytechnic Institute , Worcester, Massachusetts
| | - John T Favreau
- Department of Biomedical Engineering, Worcester Polytechnic Institute , Worcester, Massachusetts
| | - Jacques P Guyette
- Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts.; Center for Regenerative Medicine, Massachusetts General Hospital, Boston, Massachusetts
| | - Ze-Wei Tao
- Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts.; Department of Pharmaceutical Sciences, University of Arkansas for Medical Sciences, Little Rock, Arkansas
| | - Spencer T Coffin
- Department of Biomedical Engineering, Worcester Polytechnic Institute , Worcester, Massachusetts
| | - Anny Cunha-Gavidia
- Department of Biomedical Engineering, Worcester Polytechnic Institute , Worcester, Massachusetts
| | - Brian D'Amore
- Department of Biomedical Engineering, Worcester Polytechnic Institute , Worcester, Massachusetts
| | - Luke R Perreault
- Department of Biomedical Engineering, Worcester Polytechnic Institute , Worcester, Massachusetts
| | - John P Fitzpatrick
- Department of Biomedical Engineering, Worcester Polytechnic Institute , Worcester, Massachusetts
| | - Angelica DeMartino
- Department of Biomedical Engineering, Worcester Polytechnic Institute , Worcester, Massachusetts
| | - Glenn R Gaudette
- Department of Biomedical Engineering, Worcester Polytechnic Institute , Worcester, Massachusetts
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15
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Jin GZ, Park JH, Wall I, Kim HW. Isolation and culture of primary rat adipose derived stem cells using porous biopolymer microcarriers. Tissue Eng Regen Med 2016; 13:242-250. [PMID: 30603405 DOI: 10.1007/s13770-016-0040-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2016] [Revised: 03/22/2016] [Accepted: 03/28/2016] [Indexed: 01/16/2023] Open
Abstract
Adipose-derived stem cells (ADSCs) are an attractive source of material for mesenchymal stem cell research due to the abundance of adipose and relative ease of access compared with bone marrow. A key consideration for research is whether cell isolation methods can be improved, to reduce the process steps needed to isolate and expand cell material. In the current study, we used macroporous biopolymer microcarriers to isolate primary ADSCs. We found that the method was capable of isolating ADSCs that were subsequently capable of being transferred to culture dishes and expanded in vitro. Moreover, flow cytometry revealed that they expressed typical stem cell markers and were capable of undergoing tri-lineage differentiation. In summary, it is feasible to use biopolymer microcarriers for retrieval of viable ADSCs that retain identity markers of stem cell function.
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Affiliation(s)
- Guang-Zhen Jin
- 1Institute of Tissue Regeneration Engineering (ITREN), Dankook University, 119 Dandae-ro, Dongnam-gu, Cheonan, 31116 Korea.,2Department of Nanobiomedical Science & BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University, Cheonan, Korea
| | - Jeong-Hui Park
- 1Institute of Tissue Regeneration Engineering (ITREN), Dankook University, 119 Dandae-ro, Dongnam-gu, Cheonan, 31116 Korea.,2Department of Nanobiomedical Science & BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University, Cheonan, Korea
| | - Ivan Wall
- 1Institute of Tissue Regeneration Engineering (ITREN), Dankook University, 119 Dandae-ro, Dongnam-gu, Cheonan, 31116 Korea.,3Department of Biochemical Engineering, University College London, Gordon Street, London, WC1H 0AH UK
| | - Hae-Won Kim
- 1Institute of Tissue Regeneration Engineering (ITREN), Dankook University, 119 Dandae-ro, Dongnam-gu, Cheonan, 31116 Korea.,2Department of Nanobiomedical Science & BK21 PLUS NBM Global Research Center for Regenerative Medicine, Dankook University, Cheonan, Korea.,4Department of Biomaterials Science, Dankook University Dental College, Cheonan, Korea
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16
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Coffin ST, Gaudette GR. Aprotinin extends mechanical integrity time of cell-seeded fibrin sutures. J Biomed Mater Res A 2016; 104:2271-9. [PMID: 27101153 DOI: 10.1002/jbm.a.35754] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 04/07/2016] [Accepted: 04/19/2016] [Indexed: 11/07/2022]
Abstract
Cell therapy has the potential to treat different pathologies, including myocardial infarctions (heart attacks), although cell engraftment remains elusive with most delivery methods. Biological sutures composed of fibrin have been shown to effectively deliver human mesenchymal stem cell (MSC) to infarcted hearts. However, human MSCs rapidly degrade fibrin making cell seeding and delivery time sensitive. To delay the degradation process, we propose using Aprotinin, a proteolytic enzyme inhibitor that has been shown to slow fibrinolysis. Human MSCs seeded on fibrin sutures and incubated with Aprotinin demonstrated similar cell viability, examined using a LIVE/DEAD stain, to controls. No differences in proliferation, as determined by Ki-67 presence, were observed. Human MSCs incubated in Aprotinin differentiated into adipocytes, osteocytes, and chondrocytes, confirming multipotency. The number of cells adhered to fibrin sutures increased through Aprotinin supplementation at 2, 3, and 5 day time points. Uniaxial tensile testing was used to examine the effect of Aprotinin on suture integrity. Sutures exposed to Aprotinin had higher ultimate tensile strength and modulus when compared to sutures exposed to standard growth media. Fibrin sutures incubated in Aprotinin had larger diameters and less fibrin degradation products compared to the controls, confirming decreased fibrinolysis. These data suggest that Aprotinin can reduce degradation of fibrin sutures without significant effects on MSC function, providing a novel method for extending the implantation window and increasing the number of cells delivered via fibrin sutures. © 2016 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 104A: 2271-2279, 2016.
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Affiliation(s)
- Spencer T Coffin
- Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts, 01609
| | - Glenn R Gaudette
- Department of Biomedical Engineering, Worcester Polytechnic Institute, Worcester, Massachusetts, 01609
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17
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Robinson ST, Douglas AM, Chadid T, Kuo K, Rajabalan A, Li H, Copland IB, Barker TH, Galipeau J, Brewster LP. A novel platelet lysate hydrogel for endothelial cell and mesenchymal stem cell-directed neovascularization. Acta Biomater 2016; 36:86-98. [PMID: 26961805 DOI: 10.1016/j.actbio.2016.03.002] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2015] [Revised: 02/24/2016] [Accepted: 03/01/2016] [Indexed: 12/16/2022]
Abstract
UNLABELLED Mesenchymal stem cells (MSC) hold promise in promoting vascular regeneration of ischemic tissue in conditions like critical limb ischemia of the leg. However, this approach has been limited in part by poor cell retention and survival after delivery. New biomaterials offer an opportunity to localize cells to the desired tissue after delivery, but also to improve cell survival after delivery. Here we characterize the mechanical and microstructural properties of a novel hydrogel composed of pooled human platelet lysate (PL) and test its ability to promote MSC angiogenic activity using clinically relevant in vitro and in vivo models. This PL hydrogel had comparable storage and loss modulus and behaved as a viscoelastic solid similar to fibrin hydrogels despite having 1/4-1/10th the fibrin content of standard fibrin gels. Additionally, PL hydrogels enabled sustained release of endogenous PDGF-BB for up to 20days and were resistant to protease degradation. PL hydrogel stimulated pro-angiogenic activity by promoting human MSC growth and invasion in a 3D environment, and enhancing endothelial cell sprouting alone and in co-culture with MSCs. When delivered in vivo, the combination of PL and human MSCs improved local tissue perfusion after 8days compared to controls when assessed with laser Doppler perfusion imaging in a murine model of hind limb ischemia. These results support the use of a PL hydrogel as a scaffold for MSC delivery to promote vascular regeneration. STATEMENT OF SIGNIFICANCE Innovative strategies for improved retention and viability of mesenchymal stem cells (MSCs) are needed for cellular therapies. Human platelet lysate is a potent serum supplement that improves the expansion of MSCs. Here we characterize our novel PL hydrogel's desirable structural and biologic properties for human MSCs and endothelial cells. PL hydrogel can localize cells for retention in the desired tissue, improves cell viability, and augments MSCs' angiogenic activity. As a result of these unique traits, PL hydrogel is ideally suited to serve as a cell delivery vehicle for MSCs injected into ischemic tissues to promote vascular regeneration, as demonstrated here in a murine model of hindlimb ischemia.
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Affiliation(s)
| | - Alison M Douglas
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA 30322, USA
| | - Tatiana Chadid
- Emory University, Department of Surgery, Atlanta, GA 30322, USA
| | - Katie Kuo
- Emory University, Department of Surgery, Atlanta, GA 30322, USA
| | - Ajai Rajabalan
- Emory University, Department of Surgery, Atlanta, GA 30322, USA
| | - Haiyan Li
- Emory University, Department of Surgery, Atlanta, GA 30322, USA
| | - Ian B Copland
- Emory University, Department of Hematology and Oncology, Winship Cancer Institute, Atlanta, GA 30322, USA
| | - Thomas H Barker
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA 30322, USA
| | - Jacques Galipeau
- Emory University, Department of Hematology and Oncology, Winship Cancer Institute, Atlanta, GA 30322, USA
| | - Luke P Brewster
- Emory University, Department of Surgery, Atlanta, GA 30322, USA; Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA 30322, USA; Atlanta Veterans Affairs Medical Center, Surgical and Research Services, Decatur, GA 30030, USA.
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18
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O'Brien MP, Carnes ME, Page RL, Gaudette GR, Pins GD. Designing Biopolymer Microthreads for Tissue Engineering and Regenerative Medicine. CURRENT STEM CELL REPORTS 2016; 2:147-157. [PMID: 27642550 DOI: 10.1007/s40778-016-0041-9] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Native tissue structures possess elaborate extracellular matrix (ECM) architectures that inspire the design of fibrous structures in the field of regenerative medicine. We review the literature with respect to the successes and failures, as well as the future promise of biopolymer microthreads as scaffolds to promote endogenous and exogenous tissue regeneration. Biomimetic microthread tissue constructs have been proposed for the functional regeneration of tendon, ligament, skeletal muscle, and ventricular myocardial tissues. To date, biopolymer microthreads have demonstrated promising results as materials to recapitulate the hierarchical structure of simple and complex tissues and well as biochemical signaling cues to direct cell-mediated tissue regeneration. Biopolymer microthreads have also demonstrated exciting potential as a platform technology for the targeted delivery of stem cells and therapeutic molecules. Future studies will focus on the design of microthread-based tissue analogs that strategically integrate growth factors and progenitor cells to temporally direct cell-mediated processes that promote enhanced functional tissue regeneration.
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Affiliation(s)
- Megan P O'Brien
- Department of Biomedical Engineering, Worcester Polytechnic Institute, 100 Institute Rd., Worcester, MA, 01609
| | - Meagan E Carnes
- Department of Biomedical Engineering, Worcester Polytechnic Institute, 100 Institute Rd., Worcester, MA, 01609
| | - Raymond L Page
- Department of Biomedical Engineering, Worcester Polytechnic Institute, 100 Institute Rd., Worcester, MA, 01609
| | - Glenn R Gaudette
- Department of Biomedical Engineering, Worcester Polytechnic Institute, 100 Institute Rd., Worcester, MA, 01609
| | - George D Pins
- Department of Biomedical Engineering, Worcester Polytechnic Institute, 100 Institute Rd., Worcester, MA, 01609
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19
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Roura S, Gálvez-Montón C, Bayes-Genis A. Fibrin, the preferred scaffold for cell transplantation after myocardial infarction? An old molecule with a new life. J Tissue Eng Regen Med 2016; 11:2304-2313. [PMID: 27061269 DOI: 10.1002/term.2129] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Revised: 11/13/2015] [Accepted: 12/10/2015] [Indexed: 12/12/2022]
Abstract
Fibrin is a topical haemostat, sealant and tissue glue, which consists of concentrated fibrinogen and thrombin. It has broad medical and research uses. Recently, several studies have shown that engineered patches comprising mixtures of biological or synthetic materials and progenitor cells showed therapeutic promise for regenerating damaged tissues. In that context, fibrin maintains cell adherence at the site of injury, where cells are required for tissue repair, and offers a nurturing environment that protects implanted cells without interfering with their expected benefit. Here we review the past, present and future uses of fibrin, with a focus on its use as a scaffold material for cardiac repair. Fibrin patches filled with regenerative cells can be placed over the scarring myocardium; this methodology avoids many of the drawbacks of conventional cell-infusion systems. Advantages of using fibrin also include extraction from the patient's blood, an easy readjustment and implantation procedure, increase in viability and early proliferation of delivered cells, and benefits even with the patch alone. In line with this, we discuss the numerous preclinical studies that have used fibrin-cell patches, the practical issues inherent in their generation, and the necessary process of scaling-up from animal models to patients. In the light of the data presented, fibrin stands out as a valuable biomaterial for delivering cells to damaged tissue and for promoting beneficial effects. However, before the fibrin scaffold can be translated from bench to bedside, many issues must be explored further, including suboptimal survival and limited migration of the implanted cells to underlying ischaemic myocardium. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Santiago Roura
- Heart Failure and Cardiac Regeneration (ICREC) Research Programme, Germans Trias i Pujol Health Science Research Institute, Badalona, Barcelona, Spain.,Center of Regenerative Medicine in Barcelona, Barcelona, Spain
| | - Carolina Gálvez-Montón
- Heart Failure and Cardiac Regeneration (ICREC) Research Programme, Germans Trias i Pujol Health Science Research Institute, Badalona, Barcelona, Spain
| | - Antoni Bayes-Genis
- Heart Failure and Cardiac Regeneration (ICREC) Research Programme, Germans Trias i Pujol Health Science Research Institute, Badalona, Barcelona, Spain.,Cardiology Service, Germans Trias i Pujol University Hospital, Badalona, Barcelona, Spain.,Department of Medicine, Universitat Autònoma de Barcelona, Spain
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20
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Dennis C, Sethu S, Nayak S, Mohan L, Morsi YY, Manivasagam G. Suture materials - Current and emerging trends. J Biomed Mater Res A 2016; 104:1544-59. [DOI: 10.1002/jbm.a.35683] [Citation(s) in RCA: 81] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2015] [Revised: 01/07/2016] [Accepted: 02/05/2016] [Indexed: 01/08/2023]
Affiliation(s)
- Christopher Dennis
- Centre for Biomaterials Science and Technology, School of Mechanical and Building Sciences, VIT University; Vellore Tamil Nadu 632014 India
| | - Swaminathan Sethu
- GROW Research Laboratory, Narayana Nethralaya Foundation; Bangalore Karnataka 560099 India
| | - Sunita Nayak
- Centre for Biomaterials Science and Technology, School of Mechanical and Building Sciences, VIT University; Vellore Tamil Nadu 632014 India
- School of Bio Sciences and Technology, VIT University; Vellore Tamil Nadu 632014 India
| | - Loganathan Mohan
- Surface Engineering Division; CSIR - National Aerospace Laboratories; Bangalore Karnataka 560017 India
| | - Yosry Yos Morsi
- Biomechanical and Tissue Engineering Labs, Faculty of Science, Engineering and Technology, Swinburne University of Technology; Australia
| | - Geetha Manivasagam
- Centre for Biomaterials Science and Technology, School of Mechanical and Building Sciences, VIT University; Vellore Tamil Nadu 632014 India
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21
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Mertaniemi H, Escobedo-Lucea C, Sanz-Garcia A, Gandía C, Mäkitie A, Partanen J, Ikkala O, Yliperttula M. Human stem cell decorated nanocellulose threads for biomedical applications. Biomaterials 2016; 82:208-20. [DOI: 10.1016/j.biomaterials.2015.12.020] [Citation(s) in RCA: 86] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Revised: 12/16/2015] [Accepted: 12/16/2015] [Indexed: 01/07/2023]
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22
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Uehara K, Zhao C, Gingery A, Thoreson AR, An KN, Amadio PC. Effect of Fibrin Formulation on Initial Strength of Tendon Repair and Migration of Bone Marrow Stromal Cells in Vitro. J Bone Joint Surg Am 2015; 97:1792-8. [PMID: 26537167 PMCID: PMC4625644 DOI: 10.2106/jbjs.o.00292] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
BACKGROUND Cell-based tissue engineering techniques have been introduced to improve tendon repair outcomes. The purpose of this study was to determine optimal concentrations of fibrinogen and thrombin for use as a scaffold to deliver stromal cells to the tendon repair site. METHODS Lacerated flexor digitorum profundus tendons from forty canine forepaws underwent simulated repair with fibrin gel interposition. The tendons were divided into five groups with different ratios of fibrinogen (mg/mL) to thrombin (NIH units/mL) used to form the gels. These ratios, which ranged from those found in normal hemostasis to those used clinically as adhesives, were 5:25 (the physiological ratio, used as a control), 40:250 (a low adhesive concentration of fibrinogen and a low adhesive concentration of thrombin [low-low group]), 80:250 (high-low group), 40:500 (low-high group), and 80:500 (high-high group). The failure load and tensile stiffness at time zero, compressive stiffness of the fibrin gel, and cell viability and migration were evaluated. RESULTS The failure loads of the high-low and high-high groups were significantly higher than that of the control group. The tensile stiffness of the high-high group was significantly higher than that of the control group. The high-low and high-high groups had significantly higher compressive stiffness than the other groups. While there was no significant difference among the groups regarding cell viability, the cells in the control, low-low, and low-high gels were spindle-shaped whereas those in the high-low and high-high groups were rounded. Cells migrated across scratch gaps within twenty-four hours in the control, low-low, and low-high groups, but not in the high-low and high-high groups. CONCLUSIONS Higher concentrations of fibrinogen resulted in stronger and stiffer gels, but the strength was far less than that of a tendon suture and these gels were associated with a more rounded cell morphology and reduced cell migration. Therefore, lower concentrations of fibrinogen should be used if a fibrin gel is employed to deliver cells for tendon repair. CLINICAL RELEVANCE Concentrations of fibrinogen lower than those used in fibrin glue may be more appropriate if fibrin is employed to create a cell delivery matrix for tendon repair.
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Affiliation(s)
- Kosuke Uehara
- Orthopedic Biomechanics and Tendon and Soft Tissue
Biology Laboratories, Division of Orthopedic Research, and Department of Biochemistry
and Molecular Biology, Mayo Clinic, 200 First Street S.W., Rochester, MN 55905.
E-mail address for P.C. Amadio:
| | - Chunfeng Zhao
- Orthopedic Biomechanics and Tendon and Soft Tissue
Biology Laboratories, Division of Orthopedic Research, and Department of Biochemistry
and Molecular Biology, Mayo Clinic, 200 First Street S.W., Rochester, MN 55905.
E-mail address for P.C. Amadio:
| | - Anne Gingery
- Orthopedic Biomechanics and Tendon and Soft Tissue
Biology Laboratories, Division of Orthopedic Research, and Department of Biochemistry
and Molecular Biology, Mayo Clinic, 200 First Street S.W., Rochester, MN 55905.
E-mail address for P.C. Amadio:
| | - Andrew R. Thoreson
- Orthopedic Biomechanics and Tendon and Soft Tissue
Biology Laboratories, Division of Orthopedic Research, and Department of Biochemistry
and Molecular Biology, Mayo Clinic, 200 First Street S.W., Rochester, MN 55905.
E-mail address for P.C. Amadio:
| | - Kai-Nan An
- Orthopedic Biomechanics and Tendon and Soft Tissue
Biology Laboratories, Division of Orthopedic Research, and Department of Biochemistry
and Molecular Biology, Mayo Clinic, 200 First Street S.W., Rochester, MN 55905.
E-mail address for P.C. Amadio:
| | - Peter C. Amadio
- Orthopedic Biomechanics and Tendon and Soft Tissue
Biology Laboratories, Division of Orthopedic Research, and Department of Biochemistry
and Molecular Biology, Mayo Clinic, 200 First Street S.W., Rochester, MN 55905.
E-mail address for P.C. Amadio:
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23
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Boateng J, Catanzano O. Advanced Therapeutic Dressings for Effective Wound Healing--A Review. J Pharm Sci 2015; 104:3653-3680. [PMID: 26308473 DOI: 10.1002/jps.24610] [Citation(s) in RCA: 474] [Impact Index Per Article: 52.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2015] [Revised: 07/20/2015] [Accepted: 07/21/2015] [Indexed: 12/15/2022]
Abstract
Advanced therapeutic dressings that take active part in wound healing to achieve rapid and complete healing of chronic wounds is of current research interest. There is a desire for novel strategies to achieve expeditious wound healing because of the enormous financial burden worldwide. This paper reviews the current state of wound healing and wound management products, with emphasis on the demand for more advanced forms of wound therapy and some of the current challenges and driving forces behind this demand. The paper reviews information mainly from peer-reviewed literature and other publicly available sources such as the US FDA. A major focus is the treatment of chronic wounds including amputations, diabetic and leg ulcers, pressure sores, and surgical and traumatic wounds (e.g., accidents and burns) where patient immunity is low and the risk of infections and complications are high. The main dressings include medicated moist dressings, tissue-engineered substitutes, biomaterials-based biological dressings, biological and naturally derived dressings, medicated sutures, and various combinations of the above classes. Finally, the review briefly discusses possible prospects of advanced wound healing including some of the emerging physical approaches such as hyperbaric oxygen, negative pressure wound therapy and laser wound healing, in routine clinical care.
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Affiliation(s)
- Joshua Boateng
- Department of Pharmaceutical, Chemical and Environmental Sciences, Faculty of Engineering and Science, University of Greenwich, Chatham Maritime, Kent ME4 4TB, UK.
| | - Ovidio Catanzano
- Department of Pharmaceutical, Chemical and Environmental Sciences, Faculty of Engineering and Science, University of Greenwich, Chatham Maritime, Kent ME4 4TB, UK
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24
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Tian S, Liu Q, Gnatovskiy L, Ma PX, Wang Z. Heart Regeneration with Embryonic Cardiac Progenitor Cells and Cardiac Tissue Engineering. ACTA ACUST UNITED AC 2015; 1. [PMID: 26744736 DOI: 10.19104/jstb.2015.104] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Myocardial infarction (MI) is the leading cause of death worldwide. Recent advances in stem cell research hold great potential for heart tissue regeneration through stem cell-based therapy. While multiple cell types have been transplanted into MI heart in preclinical studies or clinical trials, reduction of scar tissue and restoration of cardiac function have been modest. Several challenges hamper the development and application of stem cell-based therapy for heart regeneration. Application of cardiac progenitor cells (CPCs) and cardiac tissue engineering for cell therapy has shown great promise to repair damaged heart tissue. This review presents an overview of the current applications of embryonic CPCs and the development of cardiac tissue engineering in regeneration of functional cardiac tissue and reduction of side effects for heart regeneration. We aim to highlight the benefits of the cell therapy by application of CPCs and cardiac tissue engineering during heart regeneration.
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Affiliation(s)
- Shuo Tian
- Department of Cardiac Surgery, Cardiovascular Center, The University of Michigan, Ann Arbor, MI 48109, USA
| | - Qihai Liu
- Department of Biologic and Materials Sciences, The University of Michigan, Ann Arbor, MI 48109, USA
| | - Leonid Gnatovskiy
- Department of Cardiac Surgery, Cardiovascular Center, The University of Michigan, Ann Arbor, MI 48109, USA
| | - Peter X Ma
- Department of Biologic and Materials Sciences, The University of Michigan, Ann Arbor, MI 48109, USA; Department of Biomedical Engineering, The University of Michigan, Ann Arbor, MI 48109, USA; Macromolecular Science and Engineering Center, The University of Michigan, Ann Arbor, MI 48109, USA; Department of Materials Science and Engineering, The University of Michigan, Ann Arbor, MI 48109, USA
| | - Zhong Wang
- Department of Cardiac Surgery, Cardiovascular Center, The University of Michigan, Ann Arbor, MI 48109, USA
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25
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Mesenchymal stromal cells from adipose tissue attached to suture material enhance the closure of enterocutaneous fistulas in a rat model. Cytotherapy 2014; 16:1709-19. [DOI: 10.1016/j.jcyt.2014.08.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2014] [Revised: 08/12/2014] [Accepted: 08/15/2014] [Indexed: 02/07/2023]
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26
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Grasman JM, Pumphrey LM, Dunphy M, Perez-Rogers J, Pins GD. Static axial stretching enhances the mechanical properties and cellular responses of fibrin microthreads. Acta Biomater 2014; 10:4367-76. [PMID: 24954911 DOI: 10.1016/j.actbio.2014.06.021] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2014] [Revised: 05/01/2014] [Accepted: 06/12/2014] [Indexed: 10/25/2022]
Abstract
Fibrin microthreads are a platform technology that can be used for a variety of applications, and therefore the mechanical requirements of these microthreads differ for each tissue or device application. To develop biopolymer microthreads with tunable mechanical properties, we analyzed fibrin microthread processing conditions to strengthen the scaffold materials without the use of exogenous crosslinking agents. Fibrin microthreads were extruded, dried, rehydrated and static axially stretched 0-200% of their original lengths; then the mechanical and structural properties of the microthreads were assessed. Stretching significantly increased the tensile strength of microthreads 3-fold, yielding scaffolds with tensile strengths and stiffnesses that equaled or exceeded values reported previously for carbodiimide crosslinked threads without affecting intrinsic material properties such as strain hardening or Poisson's ratio. Interestingly, these stretching conditions did not affect the rate of proteolytic degradation of the threads. The swelling ratios of stretched microthreads decreased, and scanning electron micrographs showed increases in grooved topography with increased stretch, suggesting that stretching may increase the fibrillar alignment of fibrin fibrils. The average cell alignment with respect to the longitudinal axis of the microthreads increased 2-fold with increased stretch, further supporting the hypothesis that stretching microthreads increases the alignment of fibrin fibrils on the surfaces of the scaffolds. Together, these data suggest that stretching fibrin microthreads generates stronger materials without affecting their proteolytic stability, making stretched microthreads ideal for implantable scaffolds that require short degradation times and large initial loading properties. Further modifications to stretched microthreads, such as carbodiimide crosslinking, could generate microthreads to direct cell orientation and align tissue deposition, with additional resistance to degradation for use as a long-term scaffold for tissue regeneration.
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27
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Tao ZW, Mohamed M, Hogan M, Gutierrez L, Birla RK. Optimizing a spontaneously contracting heart tissue patch with rat neonatal cardiac cells on fibrin gel. J Tissue Eng Regen Med 2014; 11:153-163. [PMID: 24771636 DOI: 10.1002/term.1895] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2013] [Revised: 02/17/2014] [Accepted: 03/10/2014] [Indexed: 11/06/2022]
Abstract
Engineered cardiac tissues have been constructed with primary or stem cell-derived cardiac cells on natural or synthetic scaffolds. They represent a tremendous potential for the treatment of injured areas through the addition of tensional support and delivery of sufficient cells. In this study, 1-6 million (M) neonatal cardiac cells were seeded on fibrin gels to fabricate cardiac tissue patches, and the effects of culture time and cell density on spontaneous contraction rates, twitch forces and paced response frequencies were measured. Electrocardiograms and signal volume index of connexin 43 were also analysed. Patches of 1-6 M cell densities exhibited maximal contraction rates in the range 305-410 beats/min (bpm) within the first 4 days after plating; low cell density (1-3 M) patches sustained rhythmic contraction longer than high cell density patches (4-6 M). Patches with 1-6 M cell densities generated contractile forces in the range 2.245-14.065 mN/mm3 on days 4-6. Upon patch formation, a paced response frequency of approximately 6 Hz was obtained, and decreased to approximately 3 Hz after 6 days of culture. High cell density patches contained a thicker real cardiac tissue layer, which generated higher R-wave amplitudes; however, low-density patches had a greater signal volume index of connexin 43. In addition, all patches manifested endothelial cell growth and robust nuclear division. The present study demonstrates that the proper time for in vivo implantation of this cardiac construct is just at patch formation, and patches with 3-4 M cell densities are the best candidates. Copyright © 2014 John Wiley & Sons, Ltd.
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Affiliation(s)
- Ze-Wei Tao
- Department of Biomedical Engineering, Cullen College of Engineering, University of Houston, TX, USA
| | - Mohamed Mohamed
- Department of Biomedical Engineering, Cullen College of Engineering, University of Houston, TX, USA
| | - Matthew Hogan
- Department of Biomedical Engineering, Cullen College of Engineering, University of Houston, TX, USA
| | - Laura Gutierrez
- Department of Biomedical Engineering, Cullen College of Engineering, University of Houston, TX, USA
| | - Ravi K Birla
- Department of Biomedical Engineering, Cullen College of Engineering, University of Houston, TX, USA
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28
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Reckhenrich AK, Kirsch BM, Wahl EA, Schenck TL, Rezaeian F, Harder Y, Foehr P, Machens HG, Egaña JT. Surgical sutures filled with adipose-derived stem cells promote wound healing. PLoS One 2014; 9:e91169. [PMID: 24625821 PMCID: PMC3953386 DOI: 10.1371/journal.pone.0091169] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2013] [Accepted: 02/10/2014] [Indexed: 11/26/2022] Open
Abstract
Delayed wound healing and scar formation are among the most frequent complications after surgical interventions. Although biodegradable surgical sutures present an excellent drug delivery opportunity, their primary function is tissue fixation. Mesenchymal stem cells (MSC) act as trophic mediators and are successful in activating biomaterials. Here biodegradable sutures were filled with adipose-derived mesenchymal stem cells (ASC) to provide a pro-regenerative environment at the injured site. Results showed that after filling, ASCs attach to the suture material, distribute equally throughout the filaments, and remain viable in the suture. Among a broad panel of cytokines, cell-filled sutures constantly release vascular endothelial growth factor to supernatants. Such conditioned media was evaluated in an in vitro wound healing assay and showed a significant decrease in the open wound area compared to controls. After suturing in an ex vivo wound model, cells remained in the suture and maintained their metabolic activity. Furthermore, cell-filled sutures can be cryopreserved without losing their viability. This study presents an innovative approach to equip surgical sutures with pro-regenerative features and allows the treatment and fixation of wounds in one step, therefore representing a promising tool to promote wound healing after injury.
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Affiliation(s)
- Ann Katharin Reckhenrich
- Department of Plastic Surgery and Hand Surgery, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Bianca Manuela Kirsch
- Department of Plastic Surgery and Hand Surgery, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Elizabeth Ann Wahl
- Department of Plastic Surgery and Hand Surgery, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Thilo Ludwig Schenck
- Department of Plastic Surgery and Hand Surgery, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Farid Rezaeian
- Department of Plastic Surgery and Hand Surgery, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Yves Harder
- Department of Plastic Surgery and Hand Surgery, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Peter Foehr
- Chair for Orthopaedics and Sport Orthopaedics, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - Hans-Günther Machens
- Department of Plastic Surgery and Hand Surgery, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
| | - José Tomás Egaña
- Department of Plastic Surgery and Hand Surgery, Klinikum rechts der Isar, Technische Universität München, Munich, Germany
- FONDAP Center for Genome Regulation, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
- * E-mail:
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