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Speer AL, Ren X, McNeill EP, Aziz JM, Muir SM, Marino DI, Dadhich P, Sawant K, Ciccocioppo R, Asthana A, Bitar KN, Orlando G. Bioengineering of the digestive tract: approaching the clinic. Cytotherapy 2021; 23:381-389. [PMID: 33840629 DOI: 10.1016/j.jcyt.2021.02.006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Revised: 01/29/2021] [Accepted: 02/08/2021] [Indexed: 12/18/2022]
Abstract
The field of regenerative medicine is developing technologies that, in the near future, will offer alternative approaches to either cure diseases affecting the gastrointestinal tract or slow their progression by leveraging the intrinsic ability of our tissues and organs to repair after damage. This article will succinctly illustrate the three technologies that are closer to clinical translation-namely, human intestinal organoids, sphincter bioengineering and decellularization, whereby the cellular compartment of a given segment of the digestive tract is removed to obtain a scaffold consisting of the extracellular matrix. The latter will be used as a template for the regeneration of a functional organ, whereby the newly generated cellular compartment will be obtained from the patient's own cells. Although clinical application of this technology is approaching, product development challenges are being tackled to warrant safety and efficacy.
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Affiliation(s)
- Allison L Speer
- McGovern Medical School, The University of Texas Health Science Center, Houston, Texas, USA
| | - Xi Ren
- Department of Biomedical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania, USA
| | - Eoin P McNeill
- McGovern Medical School, The University of Texas Health Science Center, Houston, Texas, USA
| | - Justine M Aziz
- Wake Forest Baptist Medical Center, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Sean M Muir
- Wake Forest Baptist Medical Center, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Domenica I Marino
- College of Arts and Sciences, Ohio State University, Columbus, Ohio, USA
| | | | - Ketki Sawant
- Cellf Bio LLC, Winston-Salem, North Carolina, USA
| | - Rachele Ciccocioppo
- Department of Medicine, Gastroenterology Unit, Giambattista Rossi University Hospital, University Hospital Integrated Trust of Verona, University of Verona, Verona, Italy
| | - Amish Asthana
- Wake Forest Baptist Medical Center, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA
| | - Khalil N Bitar
- Wake Forest Baptist Medical Center, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA; Cellf Bio LLC, Winston-Salem, North Carolina, USA
| | - Giuseppe Orlando
- Wake Forest Baptist Medical Center, Wake Forest School of Medicine, Winston-Salem, North Carolina, USA.
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Immune responses towards bioengineered tissues and strategies to control them. Curr Opin Organ Transplant 2019; 24:582-589. [PMID: 31385889 DOI: 10.1097/mot.0000000000000688] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
PURPOSE OF REVIEW Research into development of artificial tissues and bioengineered organs to replace physiological functions of injured counterparts has highlighted a previously underestimated challenge for its clinical translatability: the immune response against biomaterials. Herein, we will provide an update and review current knowledge regarding this important barrier to regenerative medicine. RECENT FINDINGS Although a clear understanding of the immune reactivity against biomaterials remains elusive, accumulating evidence indicates that innate immune cells, primarily neutrophils and macrophages, play a key role in the initial phases of the immune response. More recently, data have shown that in later phases, T and B cells are also involved. The use of physicochemical modifications of biomaterials and cell-based strategies to modulate the host inflammatory response is being actively investigated for effective biomaterial integration. SUMMARY The immune response towards biomaterials and bioengineered organs plays a crucial role in determining their utility as transplantable grafts. Expanding our understanding of these responses is necessary for developing protolerogenic strategies and delivering on the ultimate promise of regenerative medicine.
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Abstract
Beta cell replacement has the potential to restore euglycemia in patients with insulin-dependent diabetes. Although great progress has been made in establishing allogeneic islet transplantation from deceased donors as the standard of care for those with the most labile diabetes, it is also clear that the deceased donor organ supply cannot possibly treat all those who could benefit from restoration of a normal beta cell mass, especially if immunosuppression were not required. Against this background, the International Pancreas and Islet Transplant Association in collaboration with the Harvard Stem Cell Institute, the Juvenile Diabetes Research Foundation (JDRF), and the Helmsley Foundation held a 2-day Key Opinion Leaders Meeting in Boston in 2016 to bring together experts in generating and transplanting beta cells derived from stem cells. The following summary highlights current technology, recent significant breakthroughs, unmet needs and roadblocks to stem cell-derived beta cell therapies, with the aim of spurring future preclinical collaborative investigations and progress toward the clinical application of stem cell-derived beta cells.
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Legallais C, Kim D, Mihaila SM, Mihajlovic M, Figliuzzi M, Bonandrini B, Salerno S, Yousef Yengej FA, Rookmaaker MB, Sanchez Romero N, Sainz-Arnal P, Pereira U, Pasqua M, Gerritsen KGF, Verhaar MC, Remuzzi A, Baptista PM, De Bartolo L, Masereeuw R, Stamatialis D. Bioengineering Organs for Blood Detoxification. Adv Healthc Mater 2018; 7:e1800430. [PMID: 30230709 DOI: 10.1002/adhm.201800430] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2018] [Revised: 08/23/2018] [Indexed: 12/11/2022]
Abstract
For patients with severe kidney or liver failure the best solution is currently organ transplantation. However, not all patients are eligible for transplantation and due to limited organ availability, most patients are currently treated with therapies using artificial kidney and artificial liver devices. These therapies, despite their relative success in preserving the patients' life, have important limitations since they can only replace part of the natural kidney or liver functions. As blood detoxification (and other functions) in these highly perfused organs is achieved by specialized cells, it seems relevant to review the approaches leading to bioengineered organs fulfilling most of the native organ functions. There, the culture of cells of specific phenotypes on adapted scaffolds that can be perfused takes place. In this review paper, first the functions of kidney and liver organs are briefly described. Then artificial kidney/liver devices, bioartificial kidney devices, and bioartificial liver devices are focused on, as well as biohybrid constructs obtained by decellularization and recellularization of animal organs. For all organs, a thorough overview of the literature is given and the perspectives for their application in the clinic are discussed.
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Affiliation(s)
- Cécile Legallais
- UMR CNRS 7338 Biomechanics & Bioengineering; Université de technologie de Compiègne; Sorbonne Universités; 60203 Compiègne France
| | - Dooli Kim
- (Bio)artificial organs; Department of Biomaterials Science and Technology; Faculty of Science and Technology; TechMed Institute; University of Twente; P.O. Box 217 7500 AE Enschede The Netherlands
| | - Sylvia M. Mihaila
- Division of Pharmacology; Utrecht Institute for Pharmaceutical Sciences; Utrecht University; Universiteitsweg 99 3584 CG Utrecht The Netherlands
- Department of Nephrology and Hypertension; University Medical Center Utrecht and Regenerative Medicine Utrecht; Utrecht University; Heidelberglaan 100 3584 CX Utrecht The Netherlands
| | - Milos Mihajlovic
- Division of Pharmacology; Utrecht Institute for Pharmaceutical Sciences; Utrecht University; Universiteitsweg 99 3584 CG Utrecht The Netherlands
| | - Marina Figliuzzi
- IRCCS-Istituto di Ricerche Farmacologiche Mario Negri; via Stezzano 87 24126 Bergamo Italy
| | - Barbara Bonandrini
- Department of Chemistry; Materials and Chemical Engineering “Giulio Natta”; Politecnico di Milano; Piazza Leonardo da Vinci 32 20133 Milan Italy
| | - Simona Salerno
- Institute on Membrane Technology; National Research Council of Italy; ITM-CNR; Via Pietro BUCCI, Cubo 17C - 87036 Rende Italy
| | - Fjodor A. Yousef Yengej
- Department of Nephrology and Hypertension; University Medical Center Utrecht and Regenerative Medicine Utrecht; Utrecht University; Heidelberglaan 100 3584 CX Utrecht The Netherlands
| | - Maarten B. Rookmaaker
- Department of Nephrology and Hypertension; University Medical Center Utrecht and Regenerative Medicine Utrecht; Utrecht University; Heidelberglaan 100 3584 CX Utrecht The Netherlands
| | | | - Pilar Sainz-Arnal
- Instituto de Investigación Sanitaria de Aragón (IIS Aragon); 50009 Zaragoza Spain
- Instituto Aragonés de Ciencias de la Salud (IACS); 50009 Zaragoza Spain
| | - Ulysse Pereira
- UMR CNRS 7338 Biomechanics & Bioengineering; Université de technologie de Compiègne; Sorbonne Universités; 60203 Compiègne France
| | - Mattia Pasqua
- UMR CNRS 7338 Biomechanics & Bioengineering; Université de technologie de Compiègne; Sorbonne Universités; 60203 Compiègne France
| | - Karin G. F. Gerritsen
- Department of Nephrology and Hypertension; University Medical Center Utrecht and Regenerative Medicine Utrecht; Utrecht University; Heidelberglaan 100 3584 CX Utrecht The Netherlands
| | - Marianne C. Verhaar
- Department of Nephrology and Hypertension; University Medical Center Utrecht and Regenerative Medicine Utrecht; Utrecht University; Heidelberglaan 100 3584 CX Utrecht The Netherlands
| | - Andrea Remuzzi
- IRCCS-Istituto di Ricerche Farmacologiche Mario Negri; via Stezzano 87 24126 Bergamo Italy
- Department of Management; Information and Production Engineering; University of Bergamo; viale Marconi 5 24044 Dalmine Italy
| | - Pedro M. Baptista
- Instituto de Investigación Sanitaria de Aragón (IIS Aragon); 50009 Zaragoza Spain
- Department of Management; Information and Production Engineering; University of Bergamo; viale Marconi 5 24044 Dalmine Italy
- Centro de Investigación Biomédica en Red en el Área Temática de Enfermedades Hepáticas (CIBERehd); 28029 Barcelona Spain
- Fundación ARAID; 50009 Zaragoza Spain
- Instituto de Investigación Sanitaria de la Fundación Jiménez Díaz; 28040 Madrid Spain. Department of Biomedical and Aerospace Engineering; Universidad Carlos III de Madrid; 28911 Madrid Spain
| | - Loredana De Bartolo
- Institute on Membrane Technology; National Research Council of Italy; ITM-CNR; Via Pietro BUCCI, Cubo 17C - 87036 Rende Italy
| | - Rosalinde Masereeuw
- Division of Pharmacology; Utrecht Institute for Pharmaceutical Sciences; Utrecht University; Universiteitsweg 99 3584 CG Utrecht The Netherlands
| | - Dimitrios Stamatialis
- (Bio)artificial organs; Department of Biomaterials Science and Technology; Faculty of Science and Technology; TechMed Institute; University of Twente; P.O. Box 217 7500 AE Enschede The Netherlands
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Genderen AM, Jansen J, Cheng C, Vermonden T, Masereeuw R. Renal Tubular- and Vascular Basement Membranes and their Mimicry in Engineering Vascularized Kidney Tubules. Adv Healthc Mater 2018; 7:e1800529. [PMID: 30091856 DOI: 10.1002/adhm.201800529] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 07/18/2018] [Indexed: 01/09/2023]
Abstract
The high prevalence of chronic kidney disease leads to an increased need for renal replacement therapies. While there are simply not enough donor organs available for transplantation, there is a need to seek other therapeutic avenues as current dialysis modalities are insufficient. The field of regenerative medicine and whole organ engineering is emerging, and researchers are looking for innovative ways to create (part of) a functional new organ. To biofabricate a kidney or its functional units, it is necessary to understand and learn from physiology to be able to mimic the specific tissue properties. Herein is provided an overview of the knowledge on tubular and vascular basement membranes' biochemical components and biophysical properties, and the major differences between the two basement membranes are highlighted. Furthermore, an overview of current trends in membrane technology for developing renal replacement therapies and to stimulate kidney regeneration is provided.
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Affiliation(s)
- Anne Metje Genderen
- Division of PharmacologyUtrecht Institute for Pharmaceutical Sciences 3584 CG Utrecht The Netherlands
| | - Jitske Jansen
- Division of PharmacologyUtrecht Institute for Pharmaceutical Sciences 3584 CG Utrecht The Netherlands
| | - Caroline Cheng
- Regenerative Medicine Center UtrechtUniversity Medical Center Utrecht 3584 CT Utrecht The Netherlands
- Department of Nephrology and HypertensionUniversity Medical Center Utrecht 3508 GA Utrecht The Netherlands
- Department of Experimental CardiologyErasmus Medical Center 3015 GD Rotterdam The Netherlands
| | - Tina Vermonden
- Division of PharmaceuticsUtrecht Institute for Pharmaceutical Sciences 3584 CG Utrecht The Netherlands
| | - Rosalinde Masereeuw
- Division of PharmacologyUtrecht Institute for Pharmaceutical Sciences 3584 CG Utrecht The Netherlands
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Zhou A, Zhou Z, Peng Y, Zhao Y, Duan J, Chen P. The role of CAT in evaluating the response to treatment of patients with AECOPD. Int J Chron Obstruct Pulmon Dis 2018; 13:2849-2858. [PMID: 30237709 PMCID: PMC6138970 DOI: 10.2147/copd.s175085] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Background The chronic obstructive pulmonary disease (COPD) Assessment Test (CAT) questionnaire is a short patient-completed questionnaire, which is used to assess the health status of patients with stable COPD. However, whether it is a good tool to evaluate the response to treatment in acute exacerbation of COPD (AECOPD) has been less studied. Methods The patients were assessed at two visits, at admission and on the seventh day. Anthropometric variables were collected at admission. CAT and lung function were measured twice at the above time points. At the second visit, the health status of the patients were divided into five groups based on a 5-point Likert scale, ranging from 1 to 5, which represents "much better," "slightly better," "no change," "slightly worse," and "much worse." Responders were those who reported "much better" or "slightly better," and nonresponders were those who claimed "no change," "worse," or "much worse." Results In total, 225 patients were recruited. The average CAT score at admission was 24.82±7.41, which declined to 17.41±7.35 on the seventh day. There were 81.33% responders, whose improvement in CAT score (9.37±5.24) was much higher than that of the nonresponders (-1.36±4.35). A moderate correlation was observed between the changes in CAT score and improvement in FEV1, FEV1%, and the length of hospital stay. There was a strong correlation between the changes in CAT score and health status. A 3.5-unit improvement in the CAT score, with highest area under the curve, was the cutoff to differentiate responders from nonresponders. Conclusion The evolution of CAT scores during exacerbation can provide useful information to assess the health status of patients with AECOPD. A 3.5-unit improvement in CAT score is the best cutoff to differentiate between patients who have a response or no response to treatment, which offers a convenient and easy way for clinicians to monitor the health status of patients with an AECOPD.
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Affiliation(s)
- Aiyuan Zhou
- Department of Respiratory Medicine, Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China,
- Research Unit of Respiratory Disease, Central South University, Changsha, Hunan 410011, China,
- Diagnosis and Treatment Center of Respiratory Disease, Central South University, Changsha, Hunan 410011, China,
| | - Zijing Zhou
- Department of Respiratory Medicine, Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China,
- Research Unit of Respiratory Disease, Central South University, Changsha, Hunan 410011, China,
- Diagnosis and Treatment Center of Respiratory Disease, Central South University, Changsha, Hunan 410011, China,
| | - Yating Peng
- Department of Respiratory Medicine, Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China,
- Research Unit of Respiratory Disease, Central South University, Changsha, Hunan 410011, China,
- Diagnosis and Treatment Center of Respiratory Disease, Central South University, Changsha, Hunan 410011, China,
| | - Yiyang Zhao
- Department of Respiratory Medicine, Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China,
- Research Unit of Respiratory Disease, Central South University, Changsha, Hunan 410011, China,
- Diagnosis and Treatment Center of Respiratory Disease, Central South University, Changsha, Hunan 410011, China,
| | - Jiaxi Duan
- Department of Respiratory Medicine, Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China,
- Research Unit of Respiratory Disease, Central South University, Changsha, Hunan 410011, China,
- Diagnosis and Treatment Center of Respiratory Disease, Central South University, Changsha, Hunan 410011, China,
| | - Ping Chen
- Department of Respiratory Medicine, Second Xiangya Hospital, Central South University, Changsha, Hunan 410011, China,
- Research Unit of Respiratory Disease, Central South University, Changsha, Hunan 410011, China,
- Diagnosis and Treatment Center of Respiratory Disease, Central South University, Changsha, Hunan 410011, China,
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Decellularized kidney matrix as functional material for whole organ tissue engineering. J Appl Biomater Funct Mater 2017; 15:e326-e333. [PMID: 29131298 DOI: 10.5301/jabfm.5000393] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/31/2017] [Indexed: 12/12/2022] Open
Abstract
Renal transplantation is currently the most effective treatment for end-stage renal disease, which represents one of the major current public health problems. However, the number of available donor kidneys is drastically insufficient to meet the demand, causing prolonged waiting lists. For this reason, tissue engineering offers great potential to increase the pool of donated organs for kidney transplantation, by way of seeding cells on supporting scaffolding material. Biological scaffolds are prepared by removing cellular components from the donor organs using a decellularization process with detergents, enzymes or other cell lysing solutions. Extracellular matrix which makes up the scaffold is critical to directing the cell attachment and to creating a suitable environment for cell survival, proliferation and differentiation. Researchers are now studying whole intact scaffolds produced from the kidneys of animals or humans without adversely affecting extracellular matrix, biological activity and mechanical integrity. The process of recellularization includes cell seeding strategies and the choice of the cell source to repopulate the scaffold. This is the most difficult phase, due to the complexity of the kidney. Indeed, no studies have provided sufficient results of complete renal scaffold repopulation and differentiation. This review summarizes the research that has been conducted to obtain decellularized kidney scaffolds and to repopulate the scaffolds, evaluating the best cell sources, the cell seeding methods and the cell differentiation in kidney scaffolds.
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Abstract
OBJECTIVE During the last decade, face allotransplantation has been shown to be a revolutionary reconstructive procedure for severe disfigurements. However, offer to patients remains limited due to lifelong immunosuppression. To move forward in the field, a new pathway in tissue engineering is proposed. BACKGROUND Our previously reported technique of matrix production of a porcine auricular subunit graft has been translated to a human face model. METHODS 5 partial and 1 total face grafts were procured from human fresh cadavers. After arterial cannulation, the specimens were perfused using a combined detergent/polar solvent decellularization protocol. Preservation of vascular patency was assessed by imaging, cell and antigen removal by DNA quantification and histology. The main extracellular matrix proteins and associated cytokines were evaluated. Lip scaffolds were cultivated with dermal, muscle progenitor and endothelial cells, either on discs or in a bioreactor. RESULTS Decellularization was successful in all facial grafts within 12 days revealing acellular scaffolds with full preservation of innate morphology. Imaging demonstrated a preservation of the entire vascular tree patency. Removal of cells and antigens was confirmed by reduction of DNA and antigen markers negativation. Microscopic evaluation revealed preservation of tissue structures as well as of major proteins. Seeded cells were viable and well distributed within all scaffolds. CONCLUSIONS Complex acellular facial scaffolds were obtained, preserving simultaneously a cell-friendly extracellular matrix and a perfusable vascular tree. This step will enable further engineering of postmortem facial grafts, thereby offering new perspectives in composite tissue allotransplantation.
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Cravedi P, Farouk S, Angeletti A, Edgar L, Tamburrini R, Duisit J, Perin L, Orlando G. Regenerative immunology: the immunological reaction to biomaterials. Transpl Int 2017; 30:1199-1208. [PMID: 28892571 DOI: 10.1111/tri.13068] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Revised: 06/29/2017] [Accepted: 09/04/2017] [Indexed: 01/09/2023]
Abstract
Regenerative medicine promises to meet two of the most urgent needs of modern organ transplantation, namely immunosuppression-free transplantation and an inexhaustible source of organs. Ideally, bioengineered organs would be manufactured from a patient's own biomaterials-both cells and the supporting scaffolding materials in which cells would be embedded and allowed to mature to eventually regenerate the organ in question. While some groups are focusing on the feasibility of this approach, few are focusing on the immunogenicity of the scaffolds that are being developed for organ bioengineering purposes. This review will succinctly discuss progress in the understanding of immunological characteristics and behavior of different scaffolds currently under development, with emphasis on the extracellular matrix scaffolds obtained decellularized animal or human organs which seem to provide the ideal template for bioengineering purposes.
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Affiliation(s)
- Paolo Cravedi
- Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Samira Farouk
- Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Andrea Angeletti
- Department of Medicine, Translational Transplant Research Center, Icahn School of Medicine at Mount Sinai, New York, NY, USA.,Department of Experimental, Diagnostic, Specialty Medicine, Nephrology, Dialysis, and Renal Transplant Unit, S. Orsola University Hospital, Bologna, Italy
| | - Lauren Edgar
- Wake Forest University School of Medicine, Winston Salem, NC, USA
| | - Riccardo Tamburrini
- Wake Forest University School of Medicine, Winston Salem, NC, USA.,Section of Transplantation, Department of Surgery, Wake Forest University School of Medicine, Winston Salem, NC, USA
| | - Jerome Duisit
- Pôle de Chirurgie Expérimentale (CHEX), Institut de Recherche Expérimentale et Clinique (IREC), Université catholique de Louvain, Brussels, Belgium.,Department of Plastic and Reconstructive Surgery, Cliniques Universitaires St-Luc, Université Catholique de Louvain, Brussels, Belgium
| | - Laura Perin
- Division of Urology, GOFARR Laboratory for Organ Regenerative Research and Cell Therapeutics, Saban Research Institute, Children's Hospital Los Angeles, University of Southern California, Los Angeles, CA, USA
| | - Giuseppe Orlando
- Wake Forest University School of Medicine, Winston Salem, NC, USA.,Section of Transplantation, Department of Surgery, Wake Forest University School of Medicine, Winston Salem, NC, USA
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Extracellular matrix scaffolds as a platform for kidney regeneration. Eur J Pharmacol 2016; 790:21-27. [DOI: 10.1016/j.ejphar.2016.07.038] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Revised: 07/19/2016] [Accepted: 07/21/2016] [Indexed: 12/25/2022]
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Heterogeneity of Scaffold Biomaterials in Tissue Engineering. MATERIALS 2016; 9:ma9050332. [PMID: 28773457 PMCID: PMC5503070 DOI: 10.3390/ma9050332] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/13/2016] [Revised: 04/23/2016] [Accepted: 04/26/2016] [Indexed: 12/20/2022]
Abstract
Tissue engineering (TE) offers a potential solution for the shortage of transplantable organs and the need for novel methods of tissue repair. Methods of TE have advanced significantly in recent years, but there are challenges to using engineered tissues and organs including but not limited to: biocompatibility, immunogenicity, biodegradation, and toxicity. Analysis of biomaterials used as scaffolds may, however, elucidate how TE can be enhanced. Ideally, biomaterials should closely mimic the characteristics of desired organ, their function and their in vivo environments. A review of biomaterials used in TE highlighted natural polymers, synthetic polymers, and decellularized organs as sources of scaffolding. Studies of discarded organs supported that decellularization offers a remedy to reducing waste of donor organs, but does not yet provide an effective solution to organ demand because it has shown varied success in vivo depending on organ complexity and physiological requirements. Review of polymer-based scaffolds revealed that a composite scaffold formed by copolymerization is more effective than single polymer scaffolds because it allows copolymers to offset disadvantages a single polymer may possess. Selection of biomaterials for use in TE is essential for transplant success. There is not, however, a singular biomaterial that is universally optimal.
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