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Duan K, Liu J, Zhang J, Chu T, Liu H, Lou F, Liu Z, Gao B, Wei S, Wei F. Advancements in innate immune regulation strategies in islet transplantation. Front Immunol 2024; 14:1341314. [PMID: 38288129 PMCID: PMC10823010 DOI: 10.3389/fimmu.2023.1341314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Accepted: 12/28/2023] [Indexed: 01/31/2024] Open
Abstract
As a newly emerging organ transplantation technique, islet transplantation has shown the advantages of minimal trauma and high safety since it was first carried out. The proposal of the Edmonton protocol, which has been widely applied, was a breakthrough in this method. However, direct contact between islets and portal vein blood will cause a robust innate immune response leading to massive apoptosis of the graft, and macrophages play an essential role in the innate immune response. Therefore, therapeutic strategies targeting macrophages in the innate immune response have become a popular research topic in recent years. This paper will summarize and analyze recent research on strategies for regulating innate immunity, primarily focusing on macrophages, in the field of islet transplantation, including drug therapy, optimization of islet preparation process, islet engineering and Mesenchymal stem cells cotransplantation. We also expounded the heterogeneity, plasticity and activation mechanism of macrophages in islet transplantation, providing a theoretical basis for further research.
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Affiliation(s)
- Kehang Duan
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, The First Hospital of Jilin University, Changchun, Jilin, China
| | - Jiao Liu
- Department of Cardiology, The Second Hospital of Jilin University, Changchun, Jilin, China
| | - Jian Zhang
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, The First Hospital of Jilin University, Changchun, Jilin, China
| | - Tongjia Chu
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, The First Hospital of Jilin University, Changchun, Jilin, China
| | - Huan Liu
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, The First Hospital of Jilin University, Changchun, Jilin, China
| | - Fengxiang Lou
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, The First Hospital of Jilin University, Changchun, Jilin, China
| | - Ziyu Liu
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, The First Hospital of Jilin University, Changchun, Jilin, China
| | - Bing Gao
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, The First Hospital of Jilin University, Changchun, Jilin, China
| | - Shixiong Wei
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, The First Hospital of Jilin University, Changchun, Jilin, China
| | - Feng Wei
- Department of Hepatobiliary and Pancreatic Surgery, General Surgery Center, The First Hospital of Jilin University, Changchun, Jilin, China
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2
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Huang H, Shang Y, Li H, Feng Q, Liu Y, Chen J, Dong H. Co-transplantation of Islets-Laden Microgels and Biodegradable O 2-Generating Microspheres for Diabetes Treatment. ACS APPLIED MATERIALS & INTERFACES 2022; 14:38448-38458. [PMID: 35980755 DOI: 10.1021/acsami.2c07215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Pancreatic islets transplantation is an optimal alternative to exogenous insulin injection for long-term effective type 1 diabetes treatment. However, direct islets transplantation without any protection can induce cell necrosis due to severe host immune rejection. Insufficient O2 supply induced by the lack of capillary network at the early stage of islets transplantation is another critical constraint limiting islets survival and insulin-secretion function. In this paper, we design a novel co-transplantation system composed of islets-laden nanocomposite microgels and O2-generating microspheres. In particular, nanocomposite microgels confer the encapsulated islets with simultaneous physical protection and chemical anti-inflammation/immunosuppression by covalently anchoring rapamycin-loaded cyclodextrin nanoparticles to microgel network. Meanwhile, O2-generating microspheres prepared by blending inorganic peroxides in biodegradable polycaprolactone and polylactic acid can generate in situ O2 gas and thus avoid hypoxia environment around transplanted islets. In vivo therapeutic effect of diabetic mice proves the reversion of the high blood glucose level back to normoglycemia and superior glucose tolerance for at least 90 days post co-transplantation. In brief, the localized drug and oxygen codelivery, as well as physical protection provided by our co-transplantation system, has the potential to overcome to a large extent the inflammatory, hypoxia, and host immune rejection after islets transplantation. This new strategy may have wider application in other cell replacement therapies.
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Affiliation(s)
- Hanhao Huang
- School of Materials Science and Engineering, South China University of Technology, Guangzhou 510006, China
- National Engineering Research Center for Tissue Restoration and Reconstruction (NERC-TRR), Guangzhou 510006, China
- Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education, South China University of Technology, Guangzhou 510006, P.R. China
| | - Yulian Shang
- National Engineering Research Center for Tissue Restoration and Reconstruction (NERC-TRR), Guangzhou 510006, China
- Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education, South China University of Technology, Guangzhou 510006, P.R. China
- School of Biomedical Science and Engineering, South China University of Technology, Guangzhou 510006, China
| | - Haofei Li
- School of Materials Science and Engineering, South China University of Technology, Guangzhou 510006, China
- National Engineering Research Center for Tissue Restoration and Reconstruction (NERC-TRR), Guangzhou 510006, China
- Guangdong Province Key Laboratory of Biomedical Engineering, South China University of Technology, Guangzhou 510641, China
| | - Qi Feng
- School of Materials Science and Engineering, South China University of Technology, Guangzhou 510006, China
- National Engineering Research Center for Tissue Restoration and Reconstruction (NERC-TRR), Guangzhou 510006, China
- Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education, South China University of Technology, Guangzhou 510006, P.R. China
| | - Yang Liu
- School of Materials Science and Engineering, South China University of Technology, Guangzhou 510006, China
- National Engineering Research Center for Tissue Restoration and Reconstruction (NERC-TRR), Guangzhou 510006, China
- Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education, South China University of Technology, Guangzhou 510006, P.R. China
| | - Junlin Chen
- School of Materials Science and Engineering, South China University of Technology, Guangzhou 510006, China
- National Engineering Research Center for Tissue Restoration and Reconstruction (NERC-TRR), Guangzhou 510006, China
- Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education, South China University of Technology, Guangzhou 510006, P.R. China
| | - Hua Dong
- School of Materials Science and Engineering, South China University of Technology, Guangzhou 510006, China
- National Engineering Research Center for Tissue Restoration and Reconstruction (NERC-TRR), Guangzhou 510006, China
- Key Laboratory of Biomedical Materials and Engineering of the Ministry of Education, South China University of Technology, Guangzhou 510006, P.R. China
- Guangdong Province Key Laboratory of Biomedical Engineering, South China University of Technology, Guangzhou 510641, China
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3
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Patel SN, Mathews CE, Chandler R, Stabler CL. The Foundation for Engineering a Pancreatic Islet Niche. Front Endocrinol (Lausanne) 2022; 13:881525. [PMID: 35600597 PMCID: PMC9114707 DOI: 10.3389/fendo.2022.881525] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/22/2022] [Accepted: 03/30/2022] [Indexed: 12/01/2022] Open
Abstract
Progress in diabetes research is hindered, in part, by deficiencies in current experimental systems to accurately model human pathophysiology and/or predict clinical outcomes. Engineering human-centric platforms that more closely mimic in vivo physiology, however, requires thoughtful and informed design. Summarizing our contemporary understanding of the unique and critical features of the pancreatic islet can inform engineering design criteria. Furthermore, a broad understanding of conventional experimental practices and their current advantages and limitations ensures that new models address key gaps. Improving beyond traditional cell culture, emerging platforms are combining diabetes-relevant cells within three-dimensional niches containing dynamic matrices and controlled fluidic flow. While highly promising, islet-on-a-chip prototypes must evolve their utility, adaptability, and adoptability to ensure broad and reproducible use. Here we propose a roadmap for engineers to craft biorelevant and accessible diabetes models. Concurrently, we seek to inspire biologists to leverage such tools to ask complex and nuanced questions. The progenies of such diabetes models should ultimately enable investigators to translate ambitious research expeditions from benchtop to the clinic.
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Affiliation(s)
- Smit N. Patel
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, United States
| | - Clayton E. Mathews
- Department of Pathology, Immunology, and Laboratory Medicine, University of Florida, Gainesville, FL, United States
- Diabetes Institute, University of Florida, Gainesville, FL, United States
| | - Rachel Chandler
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, United States
| | - Cherie L. Stabler
- J. Crayton Pruitt Family Department of Biomedical Engineering, University of Florida, Gainesville, FL, United States
- Diabetes Institute, University of Florida, Gainesville, FL, United States
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4
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Quizon MJ, García AJ. Engineering β Cell Replacement Therapies for Type 1 Diabetes: Biomaterial Advances and Considerations for Macroscale Constructs. ANNUAL REVIEW OF PATHOLOGY 2022; 17:485-513. [PMID: 34813353 DOI: 10.1146/annurev-pathol-042320-094846] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
While significant progress has been made in treatments for type 1 diabetes (T1D) based on exogenous insulin, transplantation of insulin-producing cells (islets or stem cell-derived β cells) remains a promising curative strategy. The current paradigm for T1D cell therapy is clinical islet transplantation (CIT)-the infusion of islets into the liver-although this therapeutic modality comes with its own limitations that deteriorate islet health. Biomaterials can be leveraged to actively address the limitations of CIT, including undesired host inflammatory and immune responses, lack of vascularization, hypoxia, and the absence of native islet extracellular matrix cues. Moreover, in efforts toward a clinically translatable T1D cell therapy, much research now focuses on developing biomaterial platforms at the macroscale, at which implanted platforms can be easily retrieved and monitored. In this review, we discuss how biomaterials have recently been harnessed for macroscale T1D β cell replacement therapies.
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Affiliation(s)
- Michelle J Quizon
- George W. Woodruff School of Mechanical Engineering and Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332, USA; ,
| | - Andrés J García
- George W. Woodruff School of Mechanical Engineering and Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332, USA; ,
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5
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Kaviani M, Keshtkar S, Sarvestani FS, Azarpira N, Yaghobi R, Aghdaei MH, Geramizadeh B, Esfandiari E, Shamsaeefar A, Nikeghbalian S, Al-Abdullah IH, Karimi MH, Motazedian N. The potential of the incorporated collagen microspheres in alginate hydrogel as an engineered three-dimensional microenvironment to attenuate apoptosis in human pancreatic islets. Acta Histochem 2021; 123:151775. [PMID: 34450327 DOI: 10.1016/j.acthis.2021.151775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Revised: 08/15/2021] [Accepted: 08/19/2021] [Indexed: 11/28/2022]
Abstract
BACKGROUND Tissue engineering is considered as a promising tool for remodeling the native cells microenvironment. In the present study, the effect of alginate hydrogel and collagen microspheres integrated with extracellular matrix components were evaluated in the decrement of apoptosis in human pancreatic islets. MATERIALS/METHODS For three-dimensional culture, the islets were encapsulated in collagen microspheres, containing laminin and collagen IV and embedded in alginate scaffold for one week. After that the islets were examined in terms of viability, apoptosis, genes and proteins expression including BAX, BCL2, active caspase-3, and insulin. Moreover, the islets function was evaluated through glucose-induced insulin and C-peptide secretion assay. In order to evaluate the structure of the scaffolds and the morphology of the pancreatic islets in three-dimensional microenvironments, we performed scanning electron microscopy. RESULTS Our findings showed that the designed hydrogel scaffolds significantly improved the islets viability using the reduction of activated caspase-3 and TUNEL positive cells. CONCLUSIONS The reconstruction of the destructed matrix with alginate hydrogels and collagen microspheres might be an effective step to promote the culture of the islets.
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Affiliation(s)
- Maryam Kaviani
- Transplant Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Somayeh Keshtkar
- Transplant Research Center, Shiraz University of Medical Sciences, Shiraz, Iran; Department of Molecular Medicine, School of Advanced Technologies in Medicine, Tehran University of Medical Sciences, Tehran, Iran
| | | | - Negar Azarpira
- Transplant Research Center, Shiraz University of Medical Sciences, Shiraz, Iran.
| | - Ramin Yaghobi
- Transplant Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | | | - Bita Geramizadeh
- Transplant Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Elaheh Esfandiari
- Transplant Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Alireza Shamsaeefar
- Shiraz Organ Transplant Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Saman Nikeghbalian
- Shiraz Organ Transplant Center, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Ismail H Al-Abdullah
- Department of Translational Research and Cellular Therapeutics, Diabetes and Metabolism Research Institute, Beckman Research Institute of City of Hope, Duarte, USA
| | | | - Nasrin Motazedian
- Transplant Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
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6
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Goswami D, Domingo‐Lopez DA, Ward NA, Millman JR, Duffy GP, Dolan EB, Roche ET. Design Considerations for Macroencapsulation Devices for Stem Cell Derived Islets for the Treatment of Type 1 Diabetes. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:e2100820. [PMID: 34155834 PMCID: PMC8373111 DOI: 10.1002/advs.202100820] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2021] [Revised: 04/24/2021] [Indexed: 05/08/2023]
Abstract
Stem cell derived insulin producing cells or islets have shown promise in reversing Type 1 Diabetes (T1D), yet successful transplantation currently necessitates long-term modulation with immunosuppressant drugs. An alternative approach to avoiding this immune response is to utilize an islet macroencapsulation device, where islets are incorporated into a selectively permeable membrane that can protect the transplanted cells from acute host response, whilst enabling delivery of insulin. These macroencapsulation systems have to meet a number of stringent and challenging design criteria in order to achieve the ultimate goal of reversing T1D. In this progress report, the design considerations and functional requirements of macroencapsulation systems are reviewed, specifically for stem-cell derived islets (SC-islets), highlighting distinct design parameters. Additionally, a perspective on the future for macroencapsulation systems is given, and how incorporating continuous sensing and closed-loop feedback can be transformative in advancing toward an autonomous biohybrid artificial pancreas.
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Affiliation(s)
- Debkalpa Goswami
- Institute for Medical Engineering and ScienceMassachusetts Institute of TechnologyCambridgeMA02139USA
| | - Daniel A. Domingo‐Lopez
- Department of AnatomyCollege of Medicine, Nursing, and Health SciencesNational University of Ireland GalwayGalwayH91 TK33Ireland
| | - Niamh A. Ward
- Department of Biomedical EngineeringSchool of EngineeringCollege of Science and EngineeringNational University of Ireland GalwayGalwayH91 TK33Ireland
| | - Jeffrey R. Millman
- Division of Endocrinology, Metabolism & Lipid ResearchWashington University School of MedicineSt. LouisMO63110USA
- Department of Biomedical EngineeringWashington University in St. LouisSt. LouisMO63110USA
| | - Garry P. Duffy
- Department of AnatomyCollege of Medicine, Nursing, and Health SciencesNational University of Ireland GalwayGalwayH91 TK33Ireland
- Advanced Materials and BioEngineering Research Centre (AMBER)Trinity College DublinDublinD02 PN40Ireland
- CÚRAM, Centre for Research in Medical DevicesNational University of Ireland GalwayGalwayH91 TK33Ireland
| | - Eimear B. Dolan
- Department of Biomedical EngineeringSchool of EngineeringCollege of Science and EngineeringNational University of Ireland GalwayGalwayH91 TK33Ireland
| | - Ellen T. Roche
- Institute for Medical Engineering and ScienceMassachusetts Institute of TechnologyCambridgeMA02139USA
- Department of Mechanical EngineeringMassachusetts Institute of TechnologyCambridgeMA02139USA
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7
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Shaheen R, Gurlin RE, Gologorsky R, Blaha C, Munnangi P, Santandreu A, Torres A, Carnese P, Nair GG, Szot G, Fissell WH, Hebrok M, Roy S. Superporous agarose scaffolds for encapsulation of adult human islets and human stem-cell-derived β cells for intravascular bioartificial pancreas applications. J Biomed Mater Res A 2021; 109:2438-2448. [PMID: 34196100 DOI: 10.1002/jbm.a.37236] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 04/14/2021] [Accepted: 05/11/2021] [Indexed: 12/12/2022]
Abstract
Type 1 diabetic patients with severe hypoglycemia unawareness have benefitted from cellular therapies, such as pancreas or islet transplantation; however, donor shortage and the need for immunosuppression limits widespread clinical application. We previously developed an intravascular bioartificial pancreas (iBAP) using silicon nanopore membranes (SNM) for immunoprotection. To ensure ample nutrient delivery, the iBAP will need a cell scaffold with high hydraulic permeability to provide mechanical support and maintain islet viability and function. Here, we examine the feasibility of superporous agarose (SPA) as a potential cell scaffold in the iBAP. SPA exhibits 66-fold greater hydraulic permeability than the SNM along with a short (<10 μm) diffusion distance to the nearest islet. SPA also supports short-term functionality of both encapsulated human islets and stem-cell-derived enriched β-clusters in a convection-based system, demonstrated by high viability (>95%) and biphasic insulin responses to dynamic glucose stimulus. These findings suggest that the SPA scaffold will not limit nutrient delivery in a convection-based bioartificial pancreas and merits continued investigation.
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Affiliation(s)
- Rebecca Shaheen
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, California, USA
| | - Rachel E Gurlin
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, California, USA
| | - Rebecca Gologorsky
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, California, USA
| | - Charles Blaha
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, California, USA.,Silicon Kidney, San Francisco, California, USA
| | - Pujita Munnangi
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, California, USA
| | - Ana Santandreu
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, California, USA
| | - Alonso Torres
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, California, USA
| | - Phichitpol Carnese
- Diabetes Center, Department of Medicine, University of California, San Francisco, California, USA
| | - Gopika G Nair
- Diabetes Center, Department of Medicine, University of California, San Francisco, California, USA
| | - Gregory Szot
- Diabetes Center, Department of Medicine, University of California, San Francisco, California, USA
| | - William H Fissell
- Silicon Kidney, San Francisco, California, USA.,Division of Nephrology and Hypertension, Vanderbilt University Medical Center, Nashville, Tennessee, USA
| | - Matthias Hebrok
- Diabetes Center, Department of Medicine, University of California, San Francisco, California, USA
| | - Shuvo Roy
- Department of Bioengineering and Therapeutic Sciences, University of California, San Francisco, California, USA.,Silicon Kidney, San Francisco, California, USA
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8
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Schaschkow A, Sigrist S, Mura C, Barthes J, Vrana NE, Czuba E, Lemaire F, Neidl R, Dissaux C, Lejay A, Lavalle P, Bruant-Rodier C, Bouzakri K, Pinget M, Maillard E. Glycaemic control in diabetic rats treated with islet transplantation using plasma combined with hydroxypropylmethyl cellulose hydrogel. Acta Biomater 2020; 102:259-272. [PMID: 31811957 DOI: 10.1016/j.actbio.2019.11.047] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2019] [Revised: 11/15/2019] [Accepted: 11/22/2019] [Indexed: 12/18/2022]
Abstract
Islet transplantation is one of the most efficient cell therapies used in clinics and could treat a large proportion of patients with diabetes. However, it is limited by the high requirement of pancreas necessary to provide the sufficient surviving islet mass in the hepatic tissue and restore normoglycaemia. Reduction in organ procurement requirements could be achieved by extrahepatic transplantation using a biomaterial that enhances islet survival and function. We report a plasma-supplemented hydroxypropyl methylcellulose (HPMC) hydrogel, engineered specifically using a newly developed technique for intra-omental islet infusion, known as hOMING (h-Omental Matrix Islet filliNG). The HPMC hydrogel delivered islets with better performance than that of the classical intrahepatic infusion. After the validation of the HPMC suitability for islets in vivo and in vitro, plasma supplementation modified the rheological properties of HPMC without affecting its applicability with hOMING. The biomaterial association was proven to be more efficient both in vitro and in vivo, with better islet viability and function than that of the current clinical intrahepatic delivery technique. Indeed, when the islet mass was decreased by 25% or 35%, glycaemia control was observed in the group of plasma-supplemented hydrogels, whereas no regulation was observed in the hepatic group. Plasma gelation, observed immediately post infusion, decreased anoïkis and promoted vascularisation. To conclude, the threshold mass for islet transplantation could be decreased using HPMC-Plasma combined with the hOMING technique. The simplicity of the hOMING technique and the already validated use of its components could facilitate its transfer to clinics. STATEMENT OF SIGNIFICANCE: One of the major limitations for the broad deployment of current cell therapy for brittle type 1 diabetes is the islets' destruction during the transplantation process. Retrieved from their natural environment, the islets are grafted into a foreign tissue, which triggers massive cell loss. It is mandatory to provide the islets with an 3D environment specifically designed for promoting isletimplantation to improve cell therapy outcomes. For this aim, we combined HPMC and plasma. HPMC provides suitable rheological properties to the plasma to be injectable and be maintained in the omentum. Afterwards, the plasma polymerises around the graft in vivo, thereby allowing their optimal integration into their transplantation site. As a result, the islet mass required to obtain glycaemic control was reduced by 35%.
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9
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Zhu Q, Lu C, Jiang X, Yao Q, Jiang X, Huang Z, Jiang Y, Peng L, Fu H, Zhao Y. Using Recombinant Human Collagen With Basic Fibroblast Growth Factor to Provide a Simulated Extracellular Matrix Microenvironment for the Revascularization and Attachment of Islets to the Transplantation Region. Front Pharmacol 2020; 10:1536. [PMID: 31998133 PMCID: PMC6965329 DOI: 10.3389/fphar.2019.01536] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Accepted: 11/27/2019] [Indexed: 12/19/2022] Open
Abstract
Islet transplantation is considered a potential therapeutic option to reverse diabetes. The pancreatic basement membrane contains a variety of extracellular matrix (ECM) proteins. The abundant ECM is essential for the survival of transplanted islets. However, the ECM proteins necessary for maintaining islet vascularization and innervation are impaired by enzymatic digestion in the isolation process before islet transplantation, leading to destruction of islet microvessels. These are the primary concern and major barrier for long-term islet survival and function. Thus, it is crucial to create an appropriate microenvironment for improving revascularization and islet function to achieve better transplantation outcome. Given the importance of the presence of ECM proteins for islets, we introduce recombinant human collagen (RHC) to construct a simulated ECM microenvironment. To accelerate revascularization and reduce islet injury, we add basic fibroblast growth factor (bFGF) to RHC, a growth factor that has been shown to promote angiogenesis. In order to verify the outcome, islets were treated with RHC combination containing bFGF and then implanted into kidney capsule in type 1 diabetic mouse models. After transplantation, 30-day-long monitoring displayed that 16 mg–60 ng RHC-bFGF group could serve as superior transplantation outcome. It reversed the hyperglycemia condition in host rapidly, and the OGTT (oral glucose tolerance test) showed a similar pattern with the control group. Histological assessment showed that 16 mg–60 ng RHC-bFGF group attenuated apoptosis, promoted cellular proliferation, triggered vascularization, and inhibited inflammation reaction. In summary, this work demonstrates that application of 16 mg–60 ng RHC-bFGF and islets composite enhance the islet survival, function, and long-term transplantation efficiency.
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Affiliation(s)
- Qunyan Zhu
- College of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China.,Engineering Laboratory of Zhejiang Province for Pharmaceutical Development of Growth Factors, Biomedical Collaborative Innovation Center of Wenzhou, Wenzhou, China.,Trauma Center, The First Affiliated Hospital of Hainan Medical College, Haikou, China
| | - Cuitao Lu
- College of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Xuan Jiang
- College of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Qing Yao
- College of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Xue Jiang
- College of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Zhiwei Huang
- College of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Yina Jiang
- College of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Lei Peng
- College of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Hongxing Fu
- College of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China
| | - Yingzheng Zhao
- College of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou, China.,Engineering Laboratory of Zhejiang Province for Pharmaceutical Development of Growth Factors, Biomedical Collaborative Innovation Center of Wenzhou, Wenzhou, China.,Trauma Center, The First Affiliated Hospital of Hainan Medical College, Haikou, China
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10
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Zhang H, Dalisson B, Tran S, Barralet J. Preservation of Blood Vessels with an Oxygen Generating Composite. Adv Healthc Mater 2018; 7:e1701338. [PMID: 30277005 DOI: 10.1002/adhm.201701338] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2017] [Revised: 08/07/2018] [Indexed: 02/06/2023]
Abstract
Damage caused by oxygen deficiency (hypoxia) is one of the major factors limiting tissue and organ preservation time. Cooling tissues slows down metabolic rate of cells thereby prolonging tissue and organ survival sufficiently to allow transport and transplantation within a few hours. Although metabolism is slowed, cells and some enzymes continue to consume oxygen that can render cold stored tissues hypoxic. Here, an oxygen-generating composite (OGC) with sustained oxygen release is reported for ex vivo blood vessel preservation. Aorta segments are cultured under hypothermia for 25 days in vascular preservation media. The presence of OGC increases cell viability from 9 ± 6% to 96 ± 3% and retains 65 ± 8% of original KCl stimulated contractile force after 25 days compared with 25 ± 4% in controls. Culture for 7 days in nitrogen demonstrates proof-of-concept for normothermic blood vessel preservation, OGC increases the cell viability from 45 ± 15% to 78 ± 2%, and KCl stimulates contractile force from 49 ± 7% to 95 ± 8%, respectively. Oxygen release materials then may have a role in augmenting current preservation techniques.
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Affiliation(s)
- Huaifa Zhang
- Faculty of Dentistry; McGill University; Montreal QC H3A 1G1 Canada
| | | | - Simon Tran
- Faculty of Dentistry; McGill University; Montreal QC H3A 1G1 Canada
| | - Jake Barralet
- Faculty of Dentistry; McGill University; Montreal QC H3A 1G1 Canada
- Division of Orthopaedics; Department of Surgery; Faculty of Medicine; McGill University; Montreal QC H3A 1G1 Canada
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11
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Abstract
Review of emerging advances and persisting challenges in the engineering and translation of islet encapsulation technologies.
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Affiliation(s)
| | - Long-Hai Wang
- Department of Biological and Environmental Engineering
- Cornell University
- Ithaca
- USA
| | - Minglin Ma
- Department of Biological and Environmental Engineering
- Cornell University
- Ithaca
- USA
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12
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Sharp J, Spitters TW, Vermette P. A factorial design to identify process parameters affecting whole mechanically disrupted rat pancreata in a perfusion bioreactor. Biotechnol Prog 2017; 34:432-444. [PMID: 29193874 DOI: 10.1002/btpr.2589] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Revised: 09/20/2017] [Indexed: 11/07/2022]
Abstract
Few studies report whole pancreatic tissue culture, as it is a difficult task using traditional culture methods. Here, a factorial design was used to investigate the singular and combinational effects of flow, dissolved oxygen concentration (D.O.) and pulsation on whole mechanically disrupted rat pancreata in a perfusion bioreactor. Whole rat pancreata were cultured for 72 h under defined bioreactor process conditions. Secreted insulin was measured and histological (haematoxylin and eosin (H&E)) as well as immunofluorescent insulin staining were performed and quantified. The combination of flow and D.O. had the most significant effect on secreted insulin at 5 h and 24 h. The D.O. had the biggest effect on tissue histological quality, and pulsation had the biggest effect on the number of insulin-positive structures. Based on the factorial design analysis, bioreactor conditions using high flow, low D.O., and pulsation were selected to further study glucose-stimulated insulin secretion. Here, mechanically disrupted rat pancreata were cultured for 24 h under these bioreactor conditions and were then challenged with high glucose concentration for 6 h and high glucose + IBMX (an insulin secretagogue) for a further 6 h. These cultures secreted insulin in response to high glucose concentration in the first 6 h, however stimulated-insulin secretion was markedly weaker in response to high glucose concentration + IBMX thereafter. After this bioreactor culture period, higher tissue metabolic activity was found compared to that of non-bioreacted static controls. More insulin- and glucagon-positive structures, and extensive intact endothelial structures were observed compared to non-bioreacted static cultures. H&E staining revealed more intact tissue compared to static cultures. © 2017 American Institute of Chemical Engineers Biotechnol. Prog., 34:432-444, 2018.
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Affiliation(s)
- Jamie Sharp
- Laboratoire de bio-ingénierie et de biophysique de l'Université de Sherbrooke, Dept. of Chemical and Biotechnological Engineering, Université de Sherbrooke, 2500 boulevard de l'Université, Sherbrooke, Québec, Canada, J1K 2R1.,Faculté de médecine et des sciences de la santé, Pharmacology Inst. of Sherbrooke, 3001 12ième Avenue Nord, Sherbrooke, Québec, Canada, J1H 5N4.,Research Centre on Aging, Institut universitaire de gériatrie de Sherbrooke, 1036 rue Belvédère Sud, Sherbrooke, Québec, Canada, J1H 4C4
| | - Tim Wgm Spitters
- Laboratoire de bio-ingénierie et de biophysique de l'Université de Sherbrooke, Dept. of Chemical and Biotechnological Engineering, Université de Sherbrooke, 2500 boulevard de l'Université, Sherbrooke, Québec, Canada, J1K 2R1.,Faculté de médecine et des sciences de la santé, Pharmacology Inst. of Sherbrooke, 3001 12ième Avenue Nord, Sherbrooke, Québec, Canada, J1H 5N4.,Research Centre on Aging, Institut universitaire de gériatrie de Sherbrooke, 1036 rue Belvédère Sud, Sherbrooke, Québec, Canada, J1H 4C4
| | - Patrick Vermette
- Laboratoire de bio-ingénierie et de biophysique de l'Université de Sherbrooke, Dept. of Chemical and Biotechnological Engineering, Université de Sherbrooke, 2500 boulevard de l'Université, Sherbrooke, Québec, Canada, J1K 2R1.,Faculté de médecine et des sciences de la santé, Pharmacology Inst. of Sherbrooke, 3001 12ième Avenue Nord, Sherbrooke, Québec, Canada, J1H 5N4.,Research Centre on Aging, Institut universitaire de gériatrie de Sherbrooke, 1036 rue Belvédère Sud, Sherbrooke, Québec, Canada, J1H 4C4
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13
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Zhang H, Barralet JE. Mimicking oxygen delivery and waste removal functions of blood. Adv Drug Deliv Rev 2017; 122:84-104. [PMID: 28214553 DOI: 10.1016/j.addr.2017.02.001] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2016] [Revised: 02/13/2017] [Accepted: 02/13/2017] [Indexed: 12/20/2022]
Abstract
In addition to immunological and wound healing cell and platelet delivery, ion stasis and nutrient supply, blood delivers oxygen to cells and tissues and removes metabolic wastes. For decades researchers have been trying to develop approaches that mimic these two immediately vital functions of blood. Oxygen is crucial for the long-term survival of tissues and cells in vertebrates. Hypoxia (oxygen deficiency) and even at times anoxia (absence of oxygen) can occur during organ preservation, organ and cell transplantation, wound healing, in tumors and engineering of tissues. Different approaches have been developed to deliver oxygen to tissues and cells, including hyperbaric oxygen therapy (HBOT), normobaric hyperoxia therapy (NBOT), using biochemical reactions and electrolysis, employing liquids with high oxygen solubility, administering hemoglobin, myoglobin and red blood cells (RBCs), introducing oxygen-generating agents, using oxygen-carrying microparticles, persufflation, and peritoneal oxygenation. Metabolic waste accumulation is another issue in biological systems when blood flow is insufficient. Metabolic wastes change the microenvironment of cells and tissues, influence the metabolic activities of cells, and ultimately cause cell death. This review examines advances in blood mimicking systems in the field of biomedical engineering in terms of oxygen delivery and metabolic waste removal.
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14
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Lemos NE, Brondani LDA, Dieter C, Rheinheimer J, Bouças AP, Leitão CB, Crispim D, Bauer AC. Use of additives, scaffolds and extracellular matrix components for improvement of human pancreatic islet outcomes in vitro: A systematic review. Islets 2017; 9:73-86. [PMID: 28678625 PMCID: PMC5624286 DOI: 10.1080/19382014.2017.1335842] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Revised: 05/16/2017] [Accepted: 05/24/2017] [Indexed: 01/31/2023] Open
Abstract
Pancreatic islet transplantation is an established treatment to restore insulin independence in type 1 diabetic patients. Its success rates have increased lately based on improvements in immunosuppressive therapies and on islet isolation and culture. It is known that the quality and quantity of viable transplanted islets are crucial for the achievement of insulin independence and some studies have shown that a significant number of islets are lost during culture time. Thus, in an effort to improve islet yield during culture period, researchers have tested a variety of additives in culture media as well as alternative culture devices, such as scaffolds. However, due to the use of different categories of additives or devices, it is difficult to draw a conclusion on the benefits of these strategies. Therefore, the aim of this systematic review was to summarize the results of studies that described the use of medium additives, scaffolds or extracellular matrix (ECM) components during human pancreatic islets culture. PubMed and Embase repositories were searched. Of 5083 articles retrieved, a total of 37 articles fulfilled the eligibility criteria and were included in the review. After data extraction, articles were grouped as follows: 1) "antiapoptotic/anti-inflammatory/antioxidant," 2) "hormone," 3) "sulphonylureas," 4) "serum supplements," and 5) "scaffolds or ECM components." The effects of the reviewed additives, ECM or scaffolds on islet viability, apoptosis and function (glucose-stimulated insulin secretion - GSIS) were heterogeneous, making any major conclusion hard to sustain. Overall, some "antiapoptotic/anti-inflammatory/antioxidant" additives decreased apoptosis and improved GSIS. Moreover, islet culture with ECM components or scaffolds increased GSIS. More studies are needed to define the real impact of these strategies in improving islet transplantation outcomes.
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Affiliation(s)
- Natália Emerim Lemos
- Laboratory of Human Pancreatic Islet Biology, Endocrine Division, Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
- Postgraduation Program in Endocrinology, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Letícia de Almeida Brondani
- Laboratory of Human Pancreatic Islet Biology, Endocrine Division, Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
- Postgraduation Program in Endocrinology, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Cristine Dieter
- Laboratory of Human Pancreatic Islet Biology, Endocrine Division, Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
- Postgraduation Program in Endocrinology, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Jakeline Rheinheimer
- Laboratory of Human Pancreatic Islet Biology, Endocrine Division, Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
- Postgraduation Program in Endocrinology, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Ana Paula Bouças
- Laboratory of Human Pancreatic Islet Biology, Endocrine Division, Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
| | - Cristiane Bauermann Leitão
- Laboratory of Human Pancreatic Islet Biology, Endocrine Division, Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
- Postgraduation Program in Endocrinology, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Daisy Crispim
- Laboratory of Human Pancreatic Islet Biology, Endocrine Division, Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
- Postgraduation Program in Endocrinology, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
| | - Andrea Carla Bauer
- Laboratory of Human Pancreatic Islet Biology, Endocrine Division, Hospital de Clínicas de Porto Alegre, Porto Alegre, Rio Grande do Sul, Brazil
- Postgraduation Program in Endocrinology, Faculdade de Medicina, Universidade Federal do Rio Grande do Sul, Porto Alegre, Rio Grande do Sul, Brazil
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15
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Cross SE, Vaughan RH, Willcox AJ, McBride AJ, Abraham AA, Han B, Johnson JD, Maillard E, Bateman PA, Ramracheya RD, Rorsman P, Kadler KE, Dunne MJ, Hughes SJ, Johnson PRV. Key Matrix Proteins Within the Pancreatic Islet Basement Membrane Are Differentially Digested During Human Islet Isolation. Am J Transplant 2017; 17:451-461. [PMID: 27456745 DOI: 10.1111/ajt.13975] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2016] [Accepted: 07/12/2016] [Indexed: 02/06/2023]
Abstract
Clinical islet transplantation achieves insulin independence in selected patients, yet current methods for extracting islets from their surrounding pancreatic matrix are suboptimal. The islet basement membrane (BM) influences islet function and survival and is a critical marker of islet integrity following rodent islet isolation. No studies have investigated the impact of islet isolation on BM integrity in human islets, which have a unique duplex structure. To address this, samples were taken from 27 clinical human islet isolations (donor age 41-59, BMI 26-38, cold ischemic time < 10 h). Collagen IV, pan-laminin, perlecan and laminin-α5 in the islet BM were significantly digested by enzyme treatment. In isolated islets, laminin-α5 (found in both layers of the duplex BM) and perlecan were lost entirely, with no restoration evident during culture. Collagen IV and pan-laminin were present in the disorganized BM of isolated islets, yet a significant reduction in pan-laminin was seen during the initial 24 h culture period. Islet cytotoxicity increased during culture. Therefore, the human islet BM is substantially disrupted during the islet isolation procedure. Islet function and survival may be compromised as a consequence of an incomplete islet BM, which has implications for islet survival and transplanted graft longevity.
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Affiliation(s)
- S E Cross
- Islet Transplant Research Group, Nuffield Department of Surgical Sciences, John Radcliffe Hospital, University of Oxford, Oxford, UK.,Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), Churchill Hospital, University of Oxford, Oxford, UK
| | - R H Vaughan
- Islet Transplant Research Group, Nuffield Department of Surgical Sciences, John Radcliffe Hospital, University of Oxford, Oxford, UK.,Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), Churchill Hospital, University of Oxford, Oxford, UK
| | - A J Willcox
- Islet Transplant Research Group, Nuffield Department of Surgical Sciences, John Radcliffe Hospital, University of Oxford, Oxford, UK.,Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), Churchill Hospital, University of Oxford, Oxford, UK
| | - A J McBride
- Islet Transplant Research Group, Nuffield Department of Surgical Sciences, John Radcliffe Hospital, University of Oxford, Oxford, UK.,Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), Churchill Hospital, University of Oxford, Oxford, UK
| | - A A Abraham
- Islet Transplant Research Group, Nuffield Department of Surgical Sciences, John Radcliffe Hospital, University of Oxford, Oxford, UK.,Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), Churchill Hospital, University of Oxford, Oxford, UK
| | - B Han
- Faculty of Life Sciences, University of Manchester, Manchester, UK
| | - J D Johnson
- Islet Transplant Research Group, Nuffield Department of Surgical Sciences, John Radcliffe Hospital, University of Oxford, Oxford, UK.,Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), Churchill Hospital, University of Oxford, Oxford, UK
| | - E Maillard
- Islet Transplant Research Group, Nuffield Department of Surgical Sciences, John Radcliffe Hospital, University of Oxford, Oxford, UK.,Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), Churchill Hospital, University of Oxford, Oxford, UK
| | - P A Bateman
- Islet Transplant Research Group, Nuffield Department of Surgical Sciences, John Radcliffe Hospital, University of Oxford, Oxford, UK.,Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), Churchill Hospital, University of Oxford, Oxford, UK
| | - R D Ramracheya
- Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), Churchill Hospital, University of Oxford, Oxford, UK
| | - P Rorsman
- Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), Churchill Hospital, University of Oxford, Oxford, UK
| | - K E Kadler
- Faculty of Life Sciences, University of Manchester, Manchester, UK
| | - M J Dunne
- Faculty of Life Sciences, University of Manchester, Manchester, UK
| | - S J Hughes
- Islet Transplant Research Group, Nuffield Department of Surgical Sciences, John Radcliffe Hospital, University of Oxford, Oxford, UK.,Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), Churchill Hospital, University of Oxford, Oxford, UK
| | - P R V Johnson
- Islet Transplant Research Group, Nuffield Department of Surgical Sciences, John Radcliffe Hospital, University of Oxford, Oxford, UK.,Oxford Centre for Diabetes, Endocrinology and Metabolism (OCDEM), Churchill Hospital, University of Oxford, Oxford, UK
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16
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Moncion A, Arlotta KJ, O’Neill EG, Lin M, Mohr LA, Franceschi RT, Kripfgans OD, Putnam AJ, Fabiilli ML. In vitro and in vivo assessment of controlled release and degradation of acoustically responsive scaffolds. Acta Biomater 2016; 46:221-233. [PMID: 27686040 DOI: 10.1016/j.actbio.2016.09.026] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2016] [Revised: 08/30/2016] [Accepted: 09/19/2016] [Indexed: 12/14/2022]
Abstract
Spatiotemporally controlled release of growth factors (GFs) is critical for regenerative processes such as angiogenesis. A common strategy is to encapsulate the GF within hydrogels, with release being controlled via diffusion and/or gel degradation (i.e., hydrolysis and/or proteolysis). However, simple encapsulation strategies do not provide spatial or temporal control of GF delivery, especially non-invasive, on-demand controlled release post implantation. We previously demonstrated that fibrin hydrogels, which are widely used in tissue engineering and GF delivery applications, can be doped with perfluorocarbon emulsion, thus yielding an acoustically responsive scaffold (ARS) that can be modulated with focused ultrasound, specifically via a mechanism termed acoustic droplet vaporization. This study investigates the impact of ARS and ultrasound properties on controlled release of a surrogate payload (i.e., fluorescently-labeled dextran) and fibrin degradation in vitro and in vivo. Ultrasound exposure (2.5MHz, peak rarefactional pressure: 8MPa, spatial peak time average intensity: 86.4mW/cm2), generated up to 7.7 and 21.7-fold increases in dextran release from the ARSs in vitro and in vivo, respectively. Ultrasound also induced morphological changes in the ARS. Surprisingly, up to 2.9-fold greater blood vessel density was observed in ARSs compared to fibrin when implanted subcutaneously, even without delivery of pro-angiogenic GFs. The results demonstrate the potential utility of ARSs in generating controlled release for tissue regeneration. STATEMENT OF SIGNIFICANCE Simple encapsulation of a molecular payload within a conventional hydrogel scaffold does not provide spatial or temporal control of payload release. Yet, spatiotemporally controlled release of bioactive payloads is critical for tissue regeneration, which often utilizes hydrogel scaffolds to facilitate processes such as angiogenesis. This work investigates the design and performance (both in vitro and in vivo) of hydrogel scaffolds where release of a fluorescent payload is non-invasively and spatiotemporally-controlled using focused ultrasound. We also quantitatively characterize the degradation and vascularization of the scaffolds. Our results may be of interest to groups working on controlled release strategies for implants, especially within the field of tissue engineering.
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17
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Kaviani M, Azarpira N. Insight into microenvironment remodeling in pancreatic endocrine tissue engineering: Biological and biomaterial approaches. Tissue Eng Regen Med 2016; 13:475-484. [PMID: 30603429 PMCID: PMC6170842 DOI: 10.1007/s13770-016-0014-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Revised: 02/03/2016] [Accepted: 02/05/2016] [Indexed: 01/04/2023] Open
Abstract
The treatment of diabetes mellitus, as a chronic and complicated disease, is a valuable purpose. Islet transplantation can provide metabolic stability and insulin independence in type 1 diabetes patients. Diet and insulin therapy are only diabetes controllers and cannot remove all of the diabetes complications. Moreover, islet transplantation is more promising treatment than whole pancreas transplantation because of lesser invasive surgical procedure and morbidity and mortality. According to the importance of extracellular matrix for islet viability and function, microenvironment remodeling of pancreatic endocrine tissue can lead to more success in diabetes treatment by pancreatic islets. Production of bioengineered pancreas and remodeling of pancreas extracellular matrix provide essential microenvironment for re-vascularization, re-innervation and signaling cascades triggering. Therefore, islets show better viability and function in these conditions. Researchers conduct various scaffolds with different biomaterials for the improvement of islet viability, function and transplantation outcome. The attention to normal pancreas anatomy, embryology and histology is critical to understand the pancreatic Langerhans islets niche and finally to achieve efficient engineered structure. Therefore, in the present study, the status and components of the islets niche is mentioned and fundamental issues related to the tissue engineering of this structure is considered. The purpose of this review article is summarization of recent progress in the endocrine pancreas tissue engineering and biomaterials and biological aspects of it.
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Affiliation(s)
- Maryam Kaviani
- Transplant Research Center, Shiraz University of Medical Sciences, Mohamad Rasulallah Research Tower, Khalili street, Shiraz, 7193635899 Iran
| | - Negar Azarpira
- Transplant Research Center, Shiraz University of Medical Sciences, Mohamad Rasulallah Research Tower, Khalili street, Shiraz, 7193635899 Iran
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18
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Vivot K, Benahmed MA, Seyfritz E, Bietiger W, Elbayed K, Ruhland E, Langlois A, Maillard E, Pinget M, Jeandidier N, Gies JP, Namer IJ, Sigrist S, Reix N. A Metabolomic Approach ( 1H HRMAS NMR Spectroscopy) Supported by Histology to Study Early Post-transplantation Responses in Islet-transplanted Livers. Int J Biol Sci 2016; 12:1168-1180. [PMID: 27766032 PMCID: PMC5069439 DOI: 10.7150/ijbs.15189] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Accepted: 06/28/2016] [Indexed: 11/05/2022] Open
Abstract
Intrahepatic transplantation of islets requires a lot of islets because more than 50% of the graft is lost during the 24 hours following transplantation. We analyzed, in a rat model, early post-transplantation inflammation using systemic inflammatory markers, or directly in islet-transplanted livers by immunohistochemistry. 1H HRMAS NMR was employed to investigate metabolic responses associated with the transplantation. Inflammatory markers (Interleukin-6, α2-macroglobulin) are not suitable to follow islet reactions as they are not islet specific. To study islet specific inflammatory events, immunohistochemistry was performed on sections of islet transplanted livers for thrombin (indicator of the instant blood-mediated inflammatory reaction (IBMIR)) and granulocytes and macrophages. We observed a specific correlation between IBMIR and granulocyte and macrophage infiltration after 12 h. In parallel, we identified a metabolic response associated with transplantation: after 12 h, glucose, alanine, aspartate, glutamate and glutathione were significantly increased. An increase of glucose is a marker of tissue degradation, and could be explained by immune cell infiltration. Alanine, aspartate and glutamate are inter-connected in a common metabolic pathway known to be activated during hypoxia. An increase of glutathione revealed the presence of antioxidant protection. In this study, IBMIR visualization combined with 1H HRMAS NMR facilitated the characterization of cellular and molecular pathways recruited following islet transplantation.
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Affiliation(s)
- Kevin Vivot
- UMR DIATHEC, EA 7294, Centre Européen d'Etude du Diabète, Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Bld René Leriche, 67200 Strasbourg, France
| | - Malika A. Benahmed
- ICube UMR 7357, Université de Strasbourg, CNRS, IMIS, 4 rue Kirschleger, 67085 Strasbourg, France
- Service de Biophysique et Médecine Nucléaire, Hôpitaux Universitaires de Strasbourg, 1 avenue Molière, 67100 Strasbourg, France
- Fédération de Médecine Translationnelle de Strasbourg (FMTS), Faculté de médecine, Strasbourg, France
| | - Elodie Seyfritz
- UMR DIATHEC, EA 7294, Centre Européen d'Etude du Diabète, Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Bld René Leriche, 67200 Strasbourg, France
| | - William Bietiger
- UMR DIATHEC, EA 7294, Centre Européen d'Etude du Diabète, Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Bld René Leriche, 67200 Strasbourg, France
| | - Karim Elbayed
- ICube UMR 7357, Université de Strasbourg, CNRS, IMIS, 4 rue Kirschleger, 67085 Strasbourg, France
| | - Elisa Ruhland
- ICube UMR 7357, Université de Strasbourg, CNRS, IMIS, 4 rue Kirschleger, 67085 Strasbourg, France
- Fédération de Médecine Translationnelle de Strasbourg (FMTS), Faculté de médecine, Strasbourg, France
| | - Allan Langlois
- UMR DIATHEC, EA 7294, Centre Européen d'Etude du Diabète, Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Bld René Leriche, 67200 Strasbourg, France
| | - Elisa Maillard
- UMR DIATHEC, EA 7294, Centre Européen d'Etude du Diabète, Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Bld René Leriche, 67200 Strasbourg, France
| | - Michel Pinget
- UMR DIATHEC, EA 7294, Centre Européen d'Etude du Diabète, Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Bld René Leriche, 67200 Strasbourg, France
- Service d'Endocrinologie - Diabète et Maladies métaboliques, Hôpitaux Universitaires de Strasbourg, 1 place de l'Hôpital, 67091 Strasbourg, France
| | - Nathalie Jeandidier
- UMR DIATHEC, EA 7294, Centre Européen d'Etude du Diabète, Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Bld René Leriche, 67200 Strasbourg, France
- Service d'Endocrinologie - Diabète et Maladies métaboliques, Hôpitaux Universitaires de Strasbourg, 1 place de l'Hôpital, 67091 Strasbourg, France
| | - Jean-Pierre Gies
- UMR 7034 CNRS, Faculté de Pharmacie, Université de Strasbourg, 67 401 Illkirch, France
| | - Izzie-Jacques Namer
- ICube UMR 7357, Université de Strasbourg, CNRS, IMIS, 4 rue Kirschleger, 67085 Strasbourg, France
- Service de Biophysique et Médecine Nucléaire, Hôpitaux Universitaires de Strasbourg, 1 avenue Molière, 67100 Strasbourg, France
- Fédération de Médecine Translationnelle de Strasbourg (FMTS), Faculté de médecine, Strasbourg, France
| | - Séverine Sigrist
- UMR DIATHEC, EA 7294, Centre Européen d'Etude du Diabète, Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Bld René Leriche, 67200 Strasbourg, France
| | - Nathalie Reix
- ICube UMR 7357, Université de Strasbourg, CNRS, IMIS, 4 rue Kirschleger, 67085 Strasbourg, France
- Fédération de Médecine Translationnelle de Strasbourg (FMTS), Faculté de médecine, Strasbourg, France
- Laboratoire de biochimie et biologie moléculaire, Hôpitaux Universitaires de Strasbourg, 1 place de l'Hôpital, 67091 Strasbourg, France
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19
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Juliar BA, Bromley MM, Moncion A, Jones DC, O’Neill EG, Wilson CG, Franceschi RT, Fabiilli ML. In Situ Transfection by Controlled Release of Lipoplexes Using Acoustic Droplet Vaporization. Adv Healthc Mater 2016; 5:1764-74. [PMID: 27191532 PMCID: PMC4956527 DOI: 10.1002/adhm.201600008] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2016] [Revised: 03/15/2016] [Indexed: 12/26/2022]
Abstract
Localized delivery of nucleic acids to target sites (e.g., diseased tissue) is critical for safe and efficacious gene therapy. An ultrasound-based technique termed acoustic droplet vaporization (ADV) has been used to spatiotemporally control the release of therapeutic small molecules and proteins contained within sonosensitive emulsions. Here, ADV is used to control the release of lipoplex-containing plasmid DNA encoding an enhanced green fluorescent protein reporter-from a sonosensitive emulsion. Focused ultrasound (3.5 MHz, mechanical index (MI) ≥ 1.5) generates robust release of fluorescein (i.e., surrogate payload) and lipoplex from the emulsion. In situ release of the lipoplex from the emulsion using ADV (MI = 1.5, 30 cycles) yields a 55% release efficiency, resulting in 43% transfection efficiency and 95% viability with C3H/10T1/2 cells. Without exposure to ultrasound, the release and transfection efficiencies are 5% and 7%, respectively, with 99% viability. Lipoplex released by ADV retains its bioactivity while the ADV process does not yield any measureable sonoporative enhancement of transfection. Co-encapsulation of Ficoll PM 400 within the lipoplex-loaded emulsion, and its subsequent release using ADV, yield higher transfection efficiency than the lipoplex alone. The results demonstrate that ADV can have utility in the spatiotemporal control of gene delivery.
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Affiliation(s)
- Benjamin A. Juliar
- Department of Radiology, University of Michigan Health System, Ann Arbor, MI 48109, USA
| | - Melissa M. Bromley
- Department of Radiology, University of Michigan Health System, Ann Arbor, MI 48109, USA
| | - Alexander Moncion
- Department of Radiology, University of Michigan Health System, Ann Arbor, MI 48109, USA
- Applied Physics Program, University of Michigan, Ann Arbor, MI 48109, USA
| | - Denise C. Jones
- Department of Radiology, University of Michigan Health System, Ann Arbor, MI 48109, USA
| | - Eric G. O’Neill
- Department of Radiology, University of Michigan Health System, Ann Arbor, MI 48109, USA
| | | | - Renny T. Franceschi
- School of Dentistry, University of Michigan, Ann Arbor, MI 48109, USA
- Department of Biological Chemistry, University of Michigan, Ann Arbor, MI 48109, USA
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109, USA
| | - Mario L. Fabiilli
- Department of Radiology, University of Michigan Health System, Ann Arbor, MI 48109, USA
- Applied Physics Program, University of Michigan, Ann Arbor, MI 48109, USA
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20
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Hawthorne WJ, Williams L, Chew YV. Clinical Islet Isolation. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2016; 938:89-122. [PMID: 27586424 DOI: 10.1007/978-3-319-39824-2_7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The overarching success of islet transplantation relies on the success in the laboratory to isolate the islets. This chapter focuses on the processes of human islet cell isolation and the ways to optimally provide islet cells for transplantation. The major improvements in regards to the choice of enzyme type, way the digested pancreas tissue is handled to best separate islets from the acinar and surrounding tissues, the various methods of purification of the islets, their subsequent culture and quality assurance to improve outcomes to culminate in safe and effective islet transplantation will be discussed. After decades of improvements, islet cell isolation and transplantation now clearly offer a safe, effective and feasible therapeutic treatment option for an increasing number of patients suffering from type 1 diabetes specifically for those with severe hypoglycaemic unawareness.
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Affiliation(s)
- Wayne J Hawthorne
- National Pancreas and Islet Transplant Laboratories, The Westmead Institute for Medical Research, Westmead, NSW, 2145, Australia. .,Department of Surgery, Westmead Clinical School, Westmead Hospital, University of Sydney, Westmead, NSW, 2145, Australia.
| | - Lindy Williams
- National Pancreas and Islet Transplant Laboratories, The Westmead Institute for Medical Research, Westmead, NSW, 2145, Australia
| | - Yi Vee Chew
- National Pancreas and Islet Transplant Laboratories, The Westmead Institute for Medical Research, Westmead, NSW, 2145, Australia
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21
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Khosravi-Maharlooei M, Hajizadeh-Saffar E, Tahamtani Y, Basiri M, Montazeri L, Khalooghi K, Kazemi Ashtiani M, Farrokhi A, Aghdami N, Sadr Hashemi Nejad A, Larijani MB, De Leu N, Heimberg H, Luo X, Baharvand H. THERAPY OF ENDOCRINE DISEASE: Islet transplantation for type 1 diabetes: so close and yet so far away. Eur J Endocrinol 2015; 173:R165-83. [PMID: 26036437 DOI: 10.1530/eje-15-0094] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/25/2015] [Accepted: 06/02/2015] [Indexed: 12/12/2022]
Abstract
Over the past decades, tremendous efforts have been made to establish pancreatic islet transplantation as a standard therapy for type 1 diabetes. Recent advances in islet transplantation have resulted in steady improvements in the 5-year insulin independence rates for diabetic patients. Here we review the key challenges encountered in the islet transplantation field which include islet source limitation, sub-optimal engraftment of islets, lack of oxygen and blood supply for transplanted islets, and immune rejection of islets. Additionally, we discuss possible solutions for these challenges.
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Affiliation(s)
- Mohsen Khosravi-Maharlooei
- Department of Stem Cells and Developmental Biology at Cell Science Research CenterDepartment of Regenerative Medicine at Cell Science Research CenterRoyan Institute for Stem Cell Biology and Technology, ACECR, Tehran, IranEndocrinology and Metabolism Research InstituteTehran University of Medical Sciences, Tehran, IranDiabetes Research CenterVrije Universiteit Brussel, Laarbeeklaan 103, Brussels, BelgiumDivision of Nephrology and HypertensionDepartment of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USADepartment of Developmental BiologyUniversity of Science and Culture, ACECR, Tehran 148-16635, Iran
| | - Ensiyeh Hajizadeh-Saffar
- Department of Stem Cells and Developmental Biology at Cell Science Research CenterDepartment of Regenerative Medicine at Cell Science Research CenterRoyan Institute for Stem Cell Biology and Technology, ACECR, Tehran, IranEndocrinology and Metabolism Research InstituteTehran University of Medical Sciences, Tehran, IranDiabetes Research CenterVrije Universiteit Brussel, Laarbeeklaan 103, Brussels, BelgiumDivision of Nephrology and HypertensionDepartment of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USADepartment of Developmental BiologyUniversity of Science and Culture, ACECR, Tehran 148-16635, Iran
| | - Yaser Tahamtani
- Department of Stem Cells and Developmental Biology at Cell Science Research CenterDepartment of Regenerative Medicine at Cell Science Research CenterRoyan Institute for Stem Cell Biology and Technology, ACECR, Tehran, IranEndocrinology and Metabolism Research InstituteTehran University of Medical Sciences, Tehran, IranDiabetes Research CenterVrije Universiteit Brussel, Laarbeeklaan 103, Brussels, BelgiumDivision of Nephrology and HypertensionDepartment of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USADepartment of Developmental BiologyUniversity of Science and Culture, ACECR, Tehran 148-16635, Iran
| | - Mohsen Basiri
- Department of Stem Cells and Developmental Biology at Cell Science Research CenterDepartment of Regenerative Medicine at Cell Science Research CenterRoyan Institute for Stem Cell Biology and Technology, ACECR, Tehran, IranEndocrinology and Metabolism Research InstituteTehran University of Medical Sciences, Tehran, IranDiabetes Research CenterVrije Universiteit Brussel, Laarbeeklaan 103, Brussels, BelgiumDivision of Nephrology and HypertensionDepartment of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USADepartment of Developmental BiologyUniversity of Science and Culture, ACECR, Tehran 148-16635, Iran
| | - Leila Montazeri
- Department of Stem Cells and Developmental Biology at Cell Science Research CenterDepartment of Regenerative Medicine at Cell Science Research CenterRoyan Institute for Stem Cell Biology and Technology, ACECR, Tehran, IranEndocrinology and Metabolism Research InstituteTehran University of Medical Sciences, Tehran, IranDiabetes Research CenterVrije Universiteit Brussel, Laarbeeklaan 103, Brussels, BelgiumDivision of Nephrology and HypertensionDepartment of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USADepartment of Developmental BiologyUniversity of Science and Culture, ACECR, Tehran 148-16635, Iran
| | - Keynoosh Khalooghi
- Department of Stem Cells and Developmental Biology at Cell Science Research CenterDepartment of Regenerative Medicine at Cell Science Research CenterRoyan Institute for Stem Cell Biology and Technology, ACECR, Tehran, IranEndocrinology and Metabolism Research InstituteTehran University of Medical Sciences, Tehran, IranDiabetes Research CenterVrije Universiteit Brussel, Laarbeeklaan 103, Brussels, BelgiumDivision of Nephrology and HypertensionDepartment of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USADepartment of Developmental BiologyUniversity of Science and Culture, ACECR, Tehran 148-16635, Iran
| | - Mohammad Kazemi Ashtiani
- Department of Stem Cells and Developmental Biology at Cell Science Research CenterDepartment of Regenerative Medicine at Cell Science Research CenterRoyan Institute for Stem Cell Biology and Technology, ACECR, Tehran, IranEndocrinology and Metabolism Research InstituteTehran University of Medical Sciences, Tehran, IranDiabetes Research CenterVrije Universiteit Brussel, Laarbeeklaan 103, Brussels, BelgiumDivision of Nephrology and HypertensionDepartment of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USADepartment of Developmental BiologyUniversity of Science and Culture, ACECR, Tehran 148-16635, Iran
| | - Ali Farrokhi
- Department of Stem Cells and Developmental Biology at Cell Science Research CenterDepartment of Regenerative Medicine at Cell Science Research CenterRoyan Institute for Stem Cell Biology and Technology, ACECR, Tehran, IranEndocrinology and Metabolism Research InstituteTehran University of Medical Sciences, Tehran, IranDiabetes Research CenterVrije Universiteit Brussel, Laarbeeklaan 103, Brussels, BelgiumDivision of Nephrology and HypertensionDepartment of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USADepartment of Developmental BiologyUniversity of Science and Culture, ACECR, Tehran 148-16635, Iran
| | - Nasser Aghdami
- Department of Stem Cells and Developmental Biology at Cell Science Research CenterDepartment of Regenerative Medicine at Cell Science Research CenterRoyan Institute for Stem Cell Biology and Technology, ACECR, Tehran, IranEndocrinology and Metabolism Research InstituteTehran University of Medical Sciences, Tehran, IranDiabetes Research CenterVrije Universiteit Brussel, Laarbeeklaan 103, Brussels, BelgiumDivision of Nephrology and HypertensionDepartment of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USADepartment of Developmental BiologyUniversity of Science and Culture, ACECR, Tehran 148-16635, Iran
| | - Anavasadat Sadr Hashemi Nejad
- Department of Stem Cells and Developmental Biology at Cell Science Research CenterDepartment of Regenerative Medicine at Cell Science Research CenterRoyan Institute for Stem Cell Biology and Technology, ACECR, Tehran, IranEndocrinology and Metabolism Research InstituteTehran University of Medical Sciences, Tehran, IranDiabetes Research CenterVrije Universiteit Brussel, Laarbeeklaan 103, Brussels, BelgiumDivision of Nephrology and HypertensionDepartment of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USADepartment of Developmental BiologyUniversity of Science and Culture, ACECR, Tehran 148-16635, Iran
| | - Mohammad-Bagher Larijani
- Department of Stem Cells and Developmental Biology at Cell Science Research CenterDepartment of Regenerative Medicine at Cell Science Research CenterRoyan Institute for Stem Cell Biology and Technology, ACECR, Tehran, IranEndocrinology and Metabolism Research InstituteTehran University of Medical Sciences, Tehran, IranDiabetes Research CenterVrije Universiteit Brussel, Laarbeeklaan 103, Brussels, BelgiumDivision of Nephrology and HypertensionDepartment of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USADepartment of Developmental BiologyUniversity of Science and Culture, ACECR, Tehran 148-16635, Iran
| | - Nico De Leu
- Department of Stem Cells and Developmental Biology at Cell Science Research CenterDepartment of Regenerative Medicine at Cell Science Research CenterRoyan Institute for Stem Cell Biology and Technology, ACECR, Tehran, IranEndocrinology and Metabolism Research InstituteTehran University of Medical Sciences, Tehran, IranDiabetes Research CenterVrije Universiteit Brussel, Laarbeeklaan 103, Brussels, BelgiumDivision of Nephrology and HypertensionDepartment of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USADepartment of Developmental BiologyUniversity of Science and Culture, ACECR, Tehran 148-16635, Iran
| | - Harry Heimberg
- Department of Stem Cells and Developmental Biology at Cell Science Research CenterDepartment of Regenerative Medicine at Cell Science Research CenterRoyan Institute for Stem Cell Biology and Technology, ACECR, Tehran, IranEndocrinology and Metabolism Research InstituteTehran University of Medical Sciences, Tehran, IranDiabetes Research CenterVrije Universiteit Brussel, Laarbeeklaan 103, Brussels, BelgiumDivision of Nephrology and HypertensionDepartment of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USADepartment of Developmental BiologyUniversity of Science and Culture, ACECR, Tehran 148-16635, Iran
| | - Xunrong Luo
- Department of Stem Cells and Developmental Biology at Cell Science Research CenterDepartment of Regenerative Medicine at Cell Science Research CenterRoyan Institute for Stem Cell Biology and Technology, ACECR, Tehran, IranEndocrinology and Metabolism Research InstituteTehran University of Medical Sciences, Tehran, IranDiabetes Research CenterVrije Universiteit Brussel, Laarbeeklaan 103, Brussels, BelgiumDivision of Nephrology and HypertensionDepartment of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USADepartment of Developmental BiologyUniversity of Science and Culture, ACECR, Tehran 148-16635, Iran
| | - Hossein Baharvand
- Department of Stem Cells and Developmental Biology at Cell Science Research CenterDepartment of Regenerative Medicine at Cell Science Research CenterRoyan Institute for Stem Cell Biology and Technology, ACECR, Tehran, IranEndocrinology and Metabolism Research InstituteTehran University of Medical Sciences, Tehran, IranDiabetes Research CenterVrije Universiteit Brussel, Laarbeeklaan 103, Brussels, BelgiumDivision of Nephrology and HypertensionDepartment of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USADepartment of Developmental BiologyUniversity of Science and Culture, ACECR, Tehran 148-16635, Iran Department of Stem Cells and Developmental Biology at Cell Science Research CenterDepartment of Regenerative Medicine at Cell Science Research CenterRoyan Institute for Stem Cell Biology and Technology, ACECR, Tehran, IranEndocrinology and Metabolism Research InstituteTehran University of Medical Sciences, Tehran, IranDiabetes Research CenterVrije Universiteit Brussel, Laarbeeklaan 103, Brussels, BelgiumDivision of Nephrology and HypertensionDepartment of Medicine, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USADepartment of Developmental BiologyUniversity of Science and Culture, ACECR, Tehran 148-16635, Iran
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22
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Tsuchiya H, Sakata N, Yoshimatsu G, Fukase M, Aoki T, Ishida M, Katayose Y, Egawa S, Unno M. Extracellular Matrix and Growth Factors Improve the Efficacy of Intramuscular Islet Transplantation. PLoS One 2015; 10:e0140910. [PMID: 26473955 PMCID: PMC4608691 DOI: 10.1371/journal.pone.0140910] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Accepted: 10/01/2015] [Indexed: 12/24/2022] Open
Abstract
Background The efficacy of intramuscular islet transplantation is poor despite being technically simple, safe, and associated with reduced rates of severe complications. We evaluated the efficacy of combined treatment with extracellular matrix (ECM) and growth factors in intramuscular islet transplantation. Methods Male BALB/C mice were used for the in vitro and transplantation studies. The following three groups were evaluated: islets without treatment (islets-only group), islets embedded in ECM with growth factors (Matrigel group), and islets embedded in ECM without growth factors [growth factor-reduced (GFR) Matrigel group]. The viability and insulin-releasing function of islets cultured for 96 h were significantly improved in Matrigel and GFR Matrigel groups compared with the islets-only group. Results Blood glucose and serum insulin levels immediately following transplantation were significantly improved in the Matrigel and GFR Matrigel groups and remained significantly improved in the Matrigel group at postoperative day (POD) 28. On histological examination, significantly decreased numbers of TdT-mediated deoxyuridine triphosphate-biotin nick end labeling-positive islet cells and significantly increased numbers of Ki67-positive cells were observed in the Matrigel and GFR Matrigel groups at POD 3. Peri-islet revascularization was most prominent in the Matrigel group at POD 14. Conclusions The efficacy of intramuscular islet transplantation was improved by combination treatment with ECM and growth factors through the inhibition of apoptosis, increased proliferation of islet cells, and promotion of revascularization.
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Affiliation(s)
| | - Naoaki Sakata
- Department of Surgery, Tohoku University, Sendai, Japan
- * E-mail:
| | | | | | - Takeshi Aoki
- Department of Surgery, Tohoku University, Sendai, Japan
| | | | - Yu Katayose
- Department of Surgery, Tohoku University, Sendai, Japan
- Division of Integrated Surgery and Oncology, Tohoku University Graduate School of Medicine, Sendai, Japan
| | - Shinichi Egawa
- Division of International Cooperation for Disaster Mediscine, International Research Institute of Disaster Science, Tohoku University, Sendai, Japan
| | - Michiaki Unno
- Department of Surgery, Tohoku University, Sendai, Japan
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23
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Schaschkow A, Mura C, Bietiger W, Peronet C, Langlois A, Bodin F, Dissaux C, Bruant-Rodier C, Pinget M, Jeandidier N, Juszczak MT, Sigrist S, Maillard E. Impact of an autologous oxygenating matrix culture system on rat islet transplantation outcome. Biomaterials 2015; 52:180-8. [PMID: 25818424 DOI: 10.1016/j.biomaterials.2015.02.031] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Revised: 01/29/2015] [Accepted: 02/01/2015] [Indexed: 10/23/2022]
Abstract
Disruption of the pancreatic islet environment combined with the decrease in oxygen supply that occurs during isolation leads to poor islet survival. The aim of this study was to validate the benefit of using a plasma-based scaffold supplemented with perfluorodecalin to improve islet transplantation outcome. Rat islets were cultured in three conditions: i) control group, ii) plasma based-matrix (P-matrix), and iii) P-matrix supplemented with emulsified perfluorodecalin. After 24 h culture, matrix/cell contacts (Integrinβ1, p-FAK/FAK, p-Akt/Akt), survival (caspase 3, TUNEL, FDA/PI), function, and HIF-1α translocation were assessed. Afterwards, P-matrices were dissolved and the islets were intraportally transplanted. Graft function was monitored for 31 days with glycaemia and C-peptide follow up. Inflammation was assessed by histology (macrophage and granulocyte staining) and thrombin/anti-thrombin complex measurement. Islet survival correlated with an increase in integrin, FAK, and Akt activation in P-matrices and function was maintained. Perfluorodecalin supplementation decreased translocation of HIF-1α in the nucleus and post-transplantation islet structure was better preserved in P-matrices, but a quicker activation of IBMIR resulted in early loss of graft function. "Oxygenating" P-matrices provided a real benefit to islet survival and resistance in vivo. However, intraportal transplantation is not suitable for this kind of culture due to IBMIR; thus, alternative sites must be explored.
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Affiliation(s)
- A Schaschkow
- UMR DIATHEC, EA 7294, Centre Européen d'Etude du Diabète, Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg, Bld René Leriche, Strasbourg, France
| | - C Mura
- UMR DIATHEC, EA 7294, Centre Européen d'Etude du Diabète, Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg, Bld René Leriche, Strasbourg, France
| | - W Bietiger
- UMR DIATHEC, EA 7294, Centre Européen d'Etude du Diabète, Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg, Bld René Leriche, Strasbourg, France
| | - C Peronet
- UMR DIATHEC, EA 7294, Centre Européen d'Etude du Diabète, Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg, Bld René Leriche, Strasbourg, France
| | - A Langlois
- UMR DIATHEC, EA 7294, Centre Européen d'Etude du Diabète, Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg, Bld René Leriche, Strasbourg, France
| | - F Bodin
- Service de chirurgie Plastique et maxillo faciale, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - C Dissaux
- Service de chirurgie Plastique et maxillo faciale, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - C Bruant-Rodier
- UMR DIATHEC, EA 7294, Centre Européen d'Etude du Diabète, Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg, Bld René Leriche, Strasbourg, France; Service de chirurgie Plastique et maxillo faciale, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - M Pinget
- Structure d'Endocrinologie, Diabète-Nutrition et Addictologie, Pôle NUDE, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - N Jeandidier
- UMR DIATHEC, EA 7294, Centre Européen d'Etude du Diabète, Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg, Bld René Leriche, Strasbourg, France; Structure d'Endocrinologie, Diabète-Nutrition et Addictologie, Pôle NUDE, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - M T Juszczak
- Department of Vascular Surgery, John Radcliffe Hospital, Oxford, United Kingdom
| | - S Sigrist
- UMR DIATHEC, EA 7294, Centre Européen d'Etude du Diabète, Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg, Bld René Leriche, Strasbourg, France
| | - E Maillard
- UMR DIATHEC, EA 7294, Centre Européen d'Etude du Diabète, Université de Strasbourg, Fédération de Médecine Translationnelle de Strasbourg, Bld René Leriche, Strasbourg, France.
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24
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Kuehn C, Fülöp T, Lakey JRT, Vermette P. Young porcine endocrine pancreatic islets cultured in fibrin and alginate gels show improved resistance towards human monocytes. ACTA ACUST UNITED AC 2014; 62:354-64. [PMID: 25239278 DOI: 10.1016/j.patbio.2014.07.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2014] [Accepted: 07/29/2014] [Indexed: 12/17/2022]
Abstract
AIM To investigate the protective function of alginate and fibrin gels used to embed porcine endocrine pancreatic islets towards human monocytes. METHODS Groups of 200 islet equivalents from young pigs were embedded in either a fibrin or in an alginate gel, and as a control seeded in tissue culture polystyrene (TCPS) well plates. The islet cultures were incubated with 2×10(5) human monocytes for 24h. In addition, both islets and monocytes were separately cultured in TCPS, fibrin and alginate. Islet morphology, viability and function were investigated as well as the secretion of cytokines TNFα, IL-6, and IL-1β. RESULTS When freely-floating in TCPS, non-encapsulated islets were surrounded by monocytes and started to disperse after 24h. In fibrin, monocytes could be found in close proximity to embedded islets, indicating monocyte migration through the gel. In contrast, after 24h, few monocytes were found close to islets in alginate. Immunofluorescence staining and manual counting showed that integrin expression was higher in fibrin-embedded islet cultures. A TUNEL assay revealed elevated numbers of apoptotic cells for islets in TCPS wells compared to fibrin and alginate cultures. Insulin secretion was higher with islets embedded in fibrin and alginate when compared to non-encapsulated islets. TNFα, IL-6 and IL-1β were found in high concentrations in the media of co-cultures and monocyte mono-culture in fibrin. CONCLUSION Both alginate and fibrin provide key structural support and offer some protection for the islets towards human monocytes. Fibrin itself triggers the cytokine secretion from monocytes.
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Affiliation(s)
- C Kuehn
- Laboratoire de bio-ingénierie et de biophysique de l'Université de Sherbrooke, Department of Chemical and Biotechnological Engineering, Université de Sherbrooke, 2500, boulevard de l'Université, J1K 2R1 Sherbrooke, Québec, Canada; Research Centre on Aging, Institut universitaire de gériatrie de Sherbrooke, 1036, rue Belvédère Sud, J1H 4C4 Sherbrooke, Québec, Canada
| | - T Fülöp
- Research Centre on Aging, Institut universitaire de gériatrie de Sherbrooke, 1036, rue Belvédère Sud, J1H 4C4 Sherbrooke, Québec, Canada
| | - J R T Lakey
- Department of Surgery and Biomedical Engineering, University of California, Irvine, 333 City Boulevard West, Suite 700, Orange, 92868 CA, United States
| | - P Vermette
- Laboratoire de bio-ingénierie et de biophysique de l'Université de Sherbrooke, Department of Chemical and Biotechnological Engineering, Université de Sherbrooke, 2500, boulevard de l'Université, J1K 2R1 Sherbrooke, Québec, Canada; Research Centre on Aging, Institut universitaire de gériatrie de Sherbrooke, 1036, rue Belvédère Sud, J1H 4C4 Sherbrooke, Québec, Canada.
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25
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Riopel M, Trinder M, Wang R. Fibrin, a scaffold material for islet transplantation and pancreatic endocrine tissue engineering. TISSUE ENGINEERING PART B-REVIEWS 2014; 21:34-44. [PMID: 24947304 DOI: 10.1089/ten.teb.2014.0188] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Fibrin is derived from fibrinogen during injury to produce a blood clot and thus promote wound repair. Composed of different domains, including Arg-Gly-Asp amino acid motifs, fibrin is used extensively as a hydrogel and sealant in the clinic. By binding to cell surface receptors like integrins and acting as a supportive 3D scaffold, fibrin has been useful in promoting cell differentiation, proliferation, function, and survival. In particular, fibrin has been able to maintain islet cell architecture, promote beta cell insulin secretion, and islet angiogenesis, as well as inducing a protective effect against cell death. During islet transplantation, fibrin improved neovascularization and islet function. These improvements resulted in reduced number of transplanted islets necessary to reverse diabetes. Therefore, fibrin, as a biocompatible and biodegradable scaffold, should be considered during subcutaneous islet transplantation and beta cell expansion in vitro to ensure maintenance of islet cell function, proliferation, and survival to develop effective cell-based therapies for the treatment of diabetes.
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Affiliation(s)
- Matthew Riopel
- 1 Children's Health Research Institute, London, Ontario, Canada
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26
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Liu F, Tian W, Yang Y, Zhang Q, Zhu M, Yang L, Yang L, Li J, Liu J, Wu P, Yang K, Wang X, Shen Y, Qi Z. Optimal method for short-term or long-term islet preservation: comparison of islet culture, cold preservation and cryopreservation. J Artif Organs 2014; 17:337-43. [PMID: 24944122 DOI: 10.1007/s10047-014-0777-x] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2013] [Accepted: 05/28/2014] [Indexed: 11/30/2022]
Abstract
Islet preservation plays an important role for the success of islet transplantation. To determine the optimal method for islet preservation, we compared the outcomes of islet culture, cold preservation, and cryopreservation in this study. Isolated rat islets were divided into three groups: 37 °C group (conventional culture at 37 °C in RPMI-1640 medium), 4 °C group (cold preservation at 4 °C in University of Wisconsin (UW) solution), and -80 °C group (cryopreservation at -80 °C with dimethyl sulfoxide (DMSO)). Recovery rate, Calcein-AM/PI double staining, insulin release, mRNA level of hypoxia-inducible factor-1α (HIF-1α), and protein level of Bax in islets were examined after short-term (1 day) or long-term (7 days) preservation. After either short-term or long-term preservation, 4 °C group showed higher recovery rate of the islets number, lower percentage of PI positive area, better insulin release ability, and lower expression levels of HIF-1α and Bax in comparison to the 37 or -80 °C group. Meanwhile, islets in 37 °C group showed better function, and down-regulation of HIF-1α and Bax than those in -80 °C group on day 1; however, worse function of islets, up-regulated HIF-1α and Bax in 37 °C group were observed in comparison to -80 °C group on day 7. These results suggest that cold preservation at 4 °C in UW solution is the optimal method in comparison to the conventional culture at 37 °C or cryopreservation at -80 °C for short-term or long-term islet preservation. Furthermore, the potential mechanism may relate to, at least in part, apoptosis induced by the HIF-1α.
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Affiliation(s)
- Fei Liu
- Department of Histology and Embryology, School of Medicine, Nankai University, 94 Weijin Road, Nankai District, Tianjin, 300071, China
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27
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Culturing Free-Floating and Fibrin-Embedded Islets with Endothelial Cells: Effects on Insulin Secretion and Apoptosis. Cell Mol Bioeng 2014. [DOI: 10.1007/s12195-014-0332-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
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28
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Kuehn C, Vermette P, Fülöp T. Cross talk between the extracellular matrix and the immune system in the context of endocrine pancreatic islet transplantation. A review article. ACTA ACUST UNITED AC 2014; 62:67-78. [DOI: 10.1016/j.patbio.2014.01.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2013] [Accepted: 01/31/2014] [Indexed: 12/14/2022]
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29
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Colton CK. Oxygen supply to encapsulated therapeutic cells. Adv Drug Deliv Rev 2014; 67-68:93-110. [PMID: 24582600 DOI: 10.1016/j.addr.2014.02.007] [Citation(s) in RCA: 100] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2013] [Revised: 01/06/2014] [Accepted: 02/19/2014] [Indexed: 02/07/2023]
Abstract
Therapeutic cells encapsulated in immunobarrier devices have promise for treatment of a variety of human diseases without immunosuppression. The absence of sufficient oxygen supply to maintain viability and function of encapsulated tissue has been the most critical impediment to progress. Within the framework of oxygen supply limitations, we review the major issues related to development of these devices, primarily in the context of encapsulated islets of Langerhans for treating diabetes, including device designs and materials, supply of tissue, protection from immune rejection, and maintenance of cell viability and function. We describe various defensive measures investigated to enhance survival of transplanted tissue, and we review the diverse approaches to enhancement of oxygen transport to encapsulated tissue, including manipulation of diffusion distances and oxygen permeability of materials, induction of neovascularization with angiogenic factors and vascularizing membranes, and methods for increasing the oxygen concentration adjacent to encapsulated tissue so as to exceed that in the microvasculature. Recent developments, particularly in this latter area, suggest that the field is ready for clinical trials of encapsulated therapeutic cells to treat diabetes.
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Kuehn C, Lakey JRT, Lamb MW, Vermette P. Young porcine endocrine pancreatic islets cultured in fibrin show improved resistance toward hydrogen peroxide. Islets 2013; 5:207-15. [PMID: 24262980 PMCID: PMC4010573 DOI: 10.4161/isl.26989] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
AIM To study the protective effect of a fibrin scaffold toward embedded young porcine endocrine pancreatic islets from hydrogen peroxide within the context of islet encapsulation in transplantation. METHODS After isolation and in vitro maturation, groups of 200 young porcine islet equivalents (IEQ) were embedded in a 200 µL fibrin gel and exposed to 2 concentrations (10 and 100 µM) of hydrogen peroxide (H2O2) to investigate the ability of fibrin to protect islets against apoptotic stimuli. As a control, young porcine islets were seeded in tissue culture polystyrene (TCPS) well plates and exposed to the same H2O2 concentrations. Islet integrity, viability and function were then investigated. RESULTS Morphologically, the integrity of islets embedded in fibrin gels was better preserved compared with that of islets cultured in TCPS plates, when exposed to H2O2. Immunofluorescence staining showed that insulin and glucagon expression was higher in islets cultured in fibrin. Overall, H2O2 incubation led to decreased insulin and glucagon expression. A TUNEL assay revealed elevated numbers of apoptotic cells for islets cultured in TCPS plates when compared with those embedded in fibrin. Islets cultured in TCPS plates and exposed to H2O2 had diminished ability to secrete insulin in response to glucose stimulation, whereas islets embedded in fibrin maintained their glucose responsiveness. Insulin trapped in fibrin was extracted and quantified, revealing insulin in the extract. CONCLUSIONS/INTERPRETATION Fibrin has a protective effect on young porcine endocrine pancreatic islets exposed to hydrogen peroxide.
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Affiliation(s)
- Carina Kuehn
- Laboratoire de bio-ingénierie et de biophysique de l’Université de Sherbrooke; Department of Chemical and Biotechnological Engineering; Université de Sherbrooke; Sherbrooke, Québec, Canada
- Research Centre on Aging; Institut universitaire de gériatrie de Sherbrooke; Sherbrooke, Québec, Canada
| | - Jonathan RT Lakey
- Department of Surgery and Biomedical Engineering; University of California, Irvine; Irvine, CA USA
| | - Morgan W Lamb
- Department of Surgery and Biomedical Engineering; University of California, Irvine; Irvine, CA USA
| | - Patrick Vermette
- Laboratoire de bio-ingénierie et de biophysique de l’Université de Sherbrooke; Department of Chemical and Biotechnological Engineering; Université de Sherbrooke; Sherbrooke, Québec, Canada
- Research Centre on Aging; Institut universitaire de gériatrie de Sherbrooke; Sherbrooke, Québec, Canada
- Correspondence to: Patrick Vermette,
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Fabiilli ML, Wilson CG, Padilla F, Martín-Saavedra FM, Fowlkes JB, Franceschi RT. Acoustic droplet-hydrogel composites for spatial and temporal control of growth factor delivery and scaffold stiffness. Acta Biomater 2013; 9:7399-409. [PMID: 23535233 DOI: 10.1016/j.actbio.2013.03.027] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2012] [Revised: 01/29/2013] [Accepted: 03/13/2013] [Indexed: 10/27/2022]
Abstract
Wound healing is regulated by temporally and spatially restricted patterns of growth factor signaling, but there are few delivery vehicles capable of the "on-demand" release necessary for recapitulating these patterns. Recently we described a perfluorocarbon double emulsion that selectively releases a protein payload upon exposure to ultrasound through a process known as acoustic droplet vaporization (ADV). In this study, we describe a delivery system composed of fibrin hydrogels doped with growth factor-loaded double emulsion for applications in tissue regeneration. Release of immunoreactive basic fibroblast growth factor (bFGF) from the composites increased up to 5-fold following ADV and delayed release was achieved by delaying exposure to ultrasound. Releasates of ultrasound-treated materials significantly increased the proliferation of endothelial cells compared to sham controls, indicating that the released bFGF was bioactive. ADV also triggered changes in the ultrastructure and mechanical properties of the fibrin as bubble formation and consolidation of the fibrin in ultrasound-treated composites were accompanied by up to a 22-fold increase in shear stiffness. ADV did not reduce the viability of cells suspended in composite scaffolds. These results demonstrate that an acoustic droplet-hydrogel composite could have broad utility in promoting wound healing through on-demand control of growth factor release and/or scaffold architecture.
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Multilineage differentiation of human-derived dermal fibroblasts transfected with genes coated on PLGA nanoparticles plus growth factors. Biomaterials 2013; 34:582-97. [DOI: 10.1016/j.biomaterials.2012.10.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2012] [Accepted: 10/01/2012] [Indexed: 01/04/2023]
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