1
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Ajima K, Tsuda N, Takaki T, Furusako S, Matsumoto S, Shinohara K, Yamashita Y, Amano S, Oyama C, Shimoda M. A porcine islet-encapsulation device that enables long-term discordant xenotransplantation in immunocompetent diabetic mice. CELL REPORTS METHODS 2023; 3:100370. [PMID: 36814843 PMCID: PMC9939365 DOI: 10.1016/j.crmeth.2022.100370] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 08/29/2022] [Accepted: 11/23/2022] [Indexed: 12/24/2022]
Abstract
Islet transplantation is an effective treatment for type 1 diabetes (T1D). However, a shortage of donors and the need for immunosuppressants are major issues. The ideal solution is to develop a source of insulin-secreting cells and an immunoprotective method. No bioartificial pancreas (BAP) devices currently meet all of the functions of long-term glycemic control, islet survival, immunoprotection, discordant xenotransplantation feasibility, and biocompatibility. We developed a device in which porcine islets were encapsulated in a highly stable and permeable hydrogel and a biocompatible immunoisolation membrane. Discordant xenotransplantation of the device into diabetic mice improved glycemic control for more than 200 days. Glycemic control was also improved in new diabetic mice "relay-transplanted" with the device after its retrieval. The easily retrieved devices exhibited almost no adhesion or fibrosis and showed sustained insulin secretion even after the two xenotransplantations. This device has the potential to be a useful BAP for T1D.
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Affiliation(s)
- Kumiko Ajima
- Pancreatic Islet Cell Transplantation Project, Research Institute National Center for Global Health and Medicine, 1-21-1 Toyama Shinjuku-ku, Tokyo 162-8655, Japan
| | - Naoto Tsuda
- Biomaterials Business Division, Mochida Pharmaceutical Co., Ltd., 722 Uenohara, Jimba, Gotemba, Shizuoka 412-8524, Japan
| | - Tadashi Takaki
- Pancreatic Islet Cell Transplantation Project, Research Institute National Center for Global Health and Medicine, 1-21-1 Toyama Shinjuku-ku, Tokyo 162-8655, Japan
- Department of Cell Growth and Differentiation, Center for iPS Cell Research and Application, Kyoto University, 53 Kawahara-cho, Shogoin, Sakyo-ku, Kyoto 606-8507, Japan
- Takeda-CiRA Joint Program (T-CiRA), 2-26-1 Muraoka-higashi, Fujisawa-shi, Kanagawa 251-8555, Japan
| | - Shoji Furusako
- Biomaterials Business Division, Mochida Pharmaceutical Co., Ltd., 1-7 Yotsuya, Shinjuku-ku, Tokyo 160-8515, Japan
| | - Shigeki Matsumoto
- Biomaterials Business Division, Mochida Pharmaceutical Co., Ltd., 722 Uenohara, Jimba, Gotemba, Shizuoka 412-8524, Japan
| | - Koya Shinohara
- Pancreatic Islet Cell Transplantation Project, Research Institute National Center for Global Health and Medicine, 1-21-1 Toyama Shinjuku-ku, Tokyo 162-8655, Japan
| | - Yzumi Yamashita
- Pancreatic Islet Cell Transplantation Project, Research Institute National Center for Global Health and Medicine, 1-21-1 Toyama Shinjuku-ku, Tokyo 162-8655, Japan
| | - Sayaka Amano
- Pancreatic Islet Cell Transplantation Project, Research Institute National Center for Global Health and Medicine, 1-21-1 Toyama Shinjuku-ku, Tokyo 162-8655, Japan
| | - Chinatsu Oyama
- Communal Laboratory, Research Institute National Center for Global Health and Medicine, 1-21-1 Toyama, Shinjuku-ku, Tokyo 162-8655, Japan
| | - Masayuki Shimoda
- Pancreatic Islet Cell Transplantation Project, Research Institute National Center for Global Health and Medicine, 1-21-1 Toyama Shinjuku-ku, Tokyo 162-8655, Japan
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2
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Denner J. Xenotransplantation of pig islet cells: Potential adverse impact of virus infections on their functionality and insulin production. Xenotransplantation 2022; 30:e12789. [PMID: 36495163 DOI: 10.1111/xen.12789] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2022] [Revised: 09/09/2022] [Accepted: 10/26/2022] [Indexed: 12/14/2022]
Affiliation(s)
- Joachim Denner
- Institute of Virology Free University Berlin Berlin Germany
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3
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Li Y, Wang H, Chen H, Liao Y, Gou S, Yan Q, Zhuang Z, Li H, Wang J, Suo Y, Lan T, Liu Y, Zhao Y, Zou Q, Nie T, Hui X, Lai L, Wu D, Fan N. Generation of a genetically modified pig model with CREBRF R457Q variant. FASEB J 2022; 36:e22611. [PMID: 36250915 DOI: 10.1096/fj.202201117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2022] [Accepted: 10/03/2022] [Indexed: 11/11/2022]
Abstract
Obesity is among the strongest risk factors for type 2 diabetes (T2D). The CREBRF missense allele rs373863828 (p. Arg457Gln, p. R457Q) is associated with increased body mass index but reduced risk of T2D in people of Pacific ancestry. To investigate the functional consequences of the CREBRF variant, we introduced the corresponding human mutation R457Q into the porcine genome. The CREBRFR457Q pigs displayed dramatically increased fat deposition, which was mainly distributed in subcutaneous adipose tissue other than visceral adipose tissue. The CREBRFR457Q variant promoted preadipocyte differentiation. The increased differentiation capacity of precursor adipocytes conferred pigs the unique histological phenotype that adipocytes had a smaller size but a greater number in subcutaneous adipose tissue (SAT) of CREBRFR457Q variant pigs. In addition, in SAT of CREBRFR457Q pigs, the contents of the peroxidative metabolites 4-hydroxy-nonenal and malondialdehyde were significantly decreased, while the activity of antioxidant enzymes, such as glutathione peroxidase, superoxide dismutase, and catalase, was increased, which was in accordance with the declined level of the reactive oxygen species (ROS) in CREBRFR457Q pigs. Together, these data supported a causal role of the CREBRFR457Q variant in the pathogenesis of obesity, partly via adipocyte hyperplasia, and further suggested that reduced oxidative stress in adipose tissue may mediate the relative metabolic protection afforded by this variant despite the related obesity.
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Affiliation(s)
- Yingying Li
- CAS Key Laboratory of Regenerative Biology, GIBH-HKU Guangdong-Hong Kong Stem Cell and Regenerative Medicine Research Centre, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, China.,University of Chinese Academy of Sciences, Beijing, China.,Sanya Institute of Swine Resource, Hainan Provincial Research Centre of Laboratory Animals, Sanya, China.,Research Unit of Generation of Large Animal Disease Models, Chinese Academy of Medical Sciences (2019RU015), Guangzhou, China.,Bioland Laboratory (Guangzhou Regenerative Medicine and Health Guangdong Laboratory), Guangzhou, China
| | - Hai Wang
- CAS Key Laboratory of Regenerative Biology, GIBH-HKU Guangdong-Hong Kong Stem Cell and Regenerative Medicine Research Centre, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, China.,Sanya Institute of Swine Resource, Hainan Provincial Research Centre of Laboratory Animals, Sanya, China.,Research Unit of Generation of Large Animal Disease Models, Chinese Academy of Medical Sciences (2019RU015), Guangzhou, China.,Bioland Laboratory (Guangzhou Regenerative Medicine and Health Guangdong Laboratory), Guangzhou, China
| | - Huangyao Chen
- CAS Key Laboratory of Regenerative Biology, GIBH-HKU Guangdong-Hong Kong Stem Cell and Regenerative Medicine Research Centre, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, China.,Sanya Institute of Swine Resource, Hainan Provincial Research Centre of Laboratory Animals, Sanya, China.,Research Unit of Generation of Large Animal Disease Models, Chinese Academy of Medical Sciences (2019RU015), Guangzhou, China.,Bioland Laboratory (Guangzhou Regenerative Medicine and Health Guangdong Laboratory), Guangzhou, China
| | - Yuan Liao
- CAS Key Laboratory of Regenerative Biology, GIBH-HKU Guangdong-Hong Kong Stem Cell and Regenerative Medicine Research Centre, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, China.,Institute of Physical Science and Information Technology, Anhui University, Hefei, China
| | - Shixue Gou
- CAS Key Laboratory of Regenerative Biology, GIBH-HKU Guangdong-Hong Kong Stem Cell and Regenerative Medicine Research Centre, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, China.,Sanya Institute of Swine Resource, Hainan Provincial Research Centre of Laboratory Animals, Sanya, China.,Research Unit of Generation of Large Animal Disease Models, Chinese Academy of Medical Sciences (2019RU015), Guangzhou, China.,Bioland Laboratory (Guangzhou Regenerative Medicine and Health Guangdong Laboratory), Guangzhou, China
| | - Quanmei Yan
- CAS Key Laboratory of Regenerative Biology, GIBH-HKU Guangdong-Hong Kong Stem Cell and Regenerative Medicine Research Centre, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, China
| | - Zhenpeng Zhuang
- CAS Key Laboratory of Regenerative Biology, GIBH-HKU Guangdong-Hong Kong Stem Cell and Regenerative Medicine Research Centre, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, China.,Sanya Institute of Swine Resource, Hainan Provincial Research Centre of Laboratory Animals, Sanya, China.,Research Unit of Generation of Large Animal Disease Models, Chinese Academy of Medical Sciences (2019RU015), Guangzhou, China.,Bioland Laboratory (Guangzhou Regenerative Medicine and Health Guangdong Laboratory), Guangzhou, China
| | - Hao Li
- CAS Key Laboratory of Regenerative Biology, GIBH-HKU Guangdong-Hong Kong Stem Cell and Regenerative Medicine Research Centre, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, China.,Sanya Institute of Swine Resource, Hainan Provincial Research Centre of Laboratory Animals, Sanya, China.,Research Unit of Generation of Large Animal Disease Models, Chinese Academy of Medical Sciences (2019RU015), Guangzhou, China.,Bioland Laboratory (Guangzhou Regenerative Medicine and Health Guangdong Laboratory), Guangzhou, China
| | - Jiaowei Wang
- CAS Key Laboratory of Regenerative Biology, GIBH-HKU Guangdong-Hong Kong Stem Cell and Regenerative Medicine Research Centre, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, China.,Sanya Institute of Swine Resource, Hainan Provincial Research Centre of Laboratory Animals, Sanya, China.,Research Unit of Generation of Large Animal Disease Models, Chinese Academy of Medical Sciences (2019RU015), Guangzhou, China.,Bioland Laboratory (Guangzhou Regenerative Medicine and Health Guangdong Laboratory), Guangzhou, China
| | - Yangyang Suo
- CAS Key Laboratory of Regenerative Biology, GIBH-HKU Guangdong-Hong Kong Stem Cell and Regenerative Medicine Research Centre, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, China.,Sanya Institute of Swine Resource, Hainan Provincial Research Centre of Laboratory Animals, Sanya, China.,Research Unit of Generation of Large Animal Disease Models, Chinese Academy of Medical Sciences (2019RU015), Guangzhou, China.,Bioland Laboratory (Guangzhou Regenerative Medicine and Health Guangdong Laboratory), Guangzhou, China
| | - Ting Lan
- CAS Key Laboratory of Regenerative Biology, GIBH-HKU Guangdong-Hong Kong Stem Cell and Regenerative Medicine Research Centre, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, China.,Sanya Institute of Swine Resource, Hainan Provincial Research Centre of Laboratory Animals, Sanya, China.,Research Unit of Generation of Large Animal Disease Models, Chinese Academy of Medical Sciences (2019RU015), Guangzhou, China.,Bioland Laboratory (Guangzhou Regenerative Medicine and Health Guangdong Laboratory), Guangzhou, China
| | - Yang Liu
- CAS Key Laboratory of Regenerative Biology, GIBH-HKU Guangdong-Hong Kong Stem Cell and Regenerative Medicine Research Centre, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, China.,Sanya Institute of Swine Resource, Hainan Provincial Research Centre of Laboratory Animals, Sanya, China.,Research Unit of Generation of Large Animal Disease Models, Chinese Academy of Medical Sciences (2019RU015), Guangzhou, China.,Bioland Laboratory (Guangzhou Regenerative Medicine and Health Guangdong Laboratory), Guangzhou, China
| | - Yu Zhao
- CAS Key Laboratory of Regenerative Biology, GIBH-HKU Guangdong-Hong Kong Stem Cell and Regenerative Medicine Research Centre, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, China.,Sanya Institute of Swine Resource, Hainan Provincial Research Centre of Laboratory Animals, Sanya, China.,Research Unit of Generation of Large Animal Disease Models, Chinese Academy of Medical Sciences (2019RU015), Guangzhou, China.,Bioland Laboratory (Guangzhou Regenerative Medicine and Health Guangdong Laboratory), Guangzhou, China
| | - Qingjian Zou
- Guangdong Provincial Key Laboratory of Large Animal Models for Biomedicine, Wuyi University, Jiangmen, China
| | - Tao Nie
- CAS Key Laboratory of Regenerative Biology, GIBH-HKU Guangdong-Hong Kong Stem Cell and Regenerative Medicine Research Centre, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, China
| | - Xiaoyan Hui
- School of Biomedical Sciences, the Chinese University of Hong Kong, Hong Kong SAR
| | - Liangxue Lai
- CAS Key Laboratory of Regenerative Biology, GIBH-HKU Guangdong-Hong Kong Stem Cell and Regenerative Medicine Research Centre, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, China.,Sanya Institute of Swine Resource, Hainan Provincial Research Centre of Laboratory Animals, Sanya, China.,Research Unit of Generation of Large Animal Disease Models, Chinese Academy of Medical Sciences (2019RU015), Guangzhou, China.,Bioland Laboratory (Guangzhou Regenerative Medicine and Health Guangdong Laboratory), Guangzhou, China.,Guangdong Provincial Key Laboratory of Large Animal Models for Biomedicine, Wuyi University, Jiangmen, China
| | - Donghai Wu
- CAS Key Laboratory of Regenerative Biology, GIBH-HKU Guangdong-Hong Kong Stem Cell and Regenerative Medicine Research Centre, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, China.,Bioland Laboratory (Guangzhou Regenerative Medicine and Health Guangdong Laboratory), Guangzhou, China
| | - Nana Fan
- CAS Key Laboratory of Regenerative Biology, GIBH-HKU Guangdong-Hong Kong Stem Cell and Regenerative Medicine Research Centre, Guangzhou Institutes of Biomedicine and Health, Chinese Academy of Sciences, Guangzhou, China.,Sanya Institute of Swine Resource, Hainan Provincial Research Centre of Laboratory Animals, Sanya, China.,Research Unit of Generation of Large Animal Disease Models, Chinese Academy of Medical Sciences (2019RU015), Guangzhou, China.,Bioland Laboratory (Guangzhou Regenerative Medicine and Health Guangdong Laboratory), Guangzhou, China
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4
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Chen C, Rawat D, Samikannu B, Bender M, Preissner KT, Linn T. Platelet glycoprotein VI-dependent thrombus stabilization is essential for the intraportal engraftment of pancreatic islets. Am J Transplant 2021; 21:2079-2089. [PMID: 33099857 DOI: 10.1111/ajt.16375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2020] [Revised: 09/15/2020] [Accepted: 10/09/2020] [Indexed: 01/25/2023]
Abstract
Platelet activation and thrombus formation have been implicated to be detrimental for intraportal pancreatic islet transplants. The platelet-specific collagen receptor glycoprotein VI (GPVI) plays a key role in thrombosis through cellular activation and the subsequent release of secondary mediators. In aggregometry and in a microfluidic dynamic assay system modeling flow in the portal vein, pancreatic islets promoted platelet aggregation and triggered thrombus formation, respectively. While platelet GPVI deficiency did not affect the initiation of these events, it was found to destabilize platelet aggregates and thrombi in this process. Interestingly, while no major difference was detected in early thrombus formation after intraportal islet transplantation, genetic GPVI deficiency or acute anti-GPVI treatment led to an inferior graft survival and function in both syngeneic mouse islet transplantation and xenogeneic human islet transplantation models. These results demonstrate that platelet GPVI signaling is indispensable in stable thrombus formation induced by pancreatic islets. GPVI deficiency resulted in thrombus destabilization and inferior islet engraftment indicating that thrombus formation is necessary for a successful intraportal islet transplantation in which platelets are active modulators.
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Affiliation(s)
- Chunguang Chen
- Clinical Research Unit, Centre of Internal Medicine, Justus Liebig University, Giessen, Germany.,Paul Langerhans Institute Dresden (PLID) of the Helmholtz Zentrum München at the University Clinic Carl Gustav Carus of Technische Universität Dresden, Helmholtz Zentrum München, Neuherberg, Germany
| | - Divya Rawat
- Clinical Research Unit, Centre of Internal Medicine, Justus Liebig University, Giessen, Germany
| | - Balaji Samikannu
- Clinical Research Unit, Centre of Internal Medicine, Justus Liebig University, Giessen, Germany.,Cell and Developmental Biology, Weill Cornell Medicine Qatar, Doha, Qatar
| | - Markus Bender
- Institute of Experimental Biomedicine - Chair I, University Hospital and Rudolf Virchow Center, Würzburg, Germany
| | - Klaus T Preissner
- Department of Biochemistry, Medical Faculty, Justus-Liebig-University, Giessen, Germany
| | - Thomas Linn
- Clinical Research Unit, Centre of Internal Medicine, Justus Liebig University, Giessen, Germany
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5
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Shinohara K, Chujo D, Tamura-Nakano M, Kurokawa T, Matsumoto S, Shimoda M. High-quality porcine islets isolated from aged miniature pigs. Xenotransplantation 2021; 28:e12675. [PMID: 33543796 DOI: 10.1111/xen.12675] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2020] [Revised: 12/11/2020] [Accepted: 01/11/2021] [Indexed: 01/13/2023]
Affiliation(s)
- Koya Shinohara
- Islet Cell Transplantation Project, Diabetes Research Center, Research Institute of National Center for Global Health and Medicine, Tokyo, Japan
| | - Daisuke Chujo
- Islet Cell Transplantation Project, Diabetes Research Center, Research Institute of National Center for Global Health and Medicine, Tokyo, Japan.,Center for Clinical Research, Toyama University Hospital, Toyama, Japan
| | - Miwa Tamura-Nakano
- Communal Laboratory, Research Institute of National Center for Global Health and Medicine, Tokyo, Japan
| | | | - Shinichi Matsumoto
- Research and Development Center, Otsuka Pharmaceutical Factory Inc., Naruto, Japan
| | - Masayuki Shimoda
- Islet Cell Transplantation Project, Diabetes Research Center, Research Institute of National Center for Global Health and Medicine, Tokyo, Japan
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6
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Porcine models for studying complications and organ crosstalk in diabetes mellitus. Cell Tissue Res 2020; 380:341-378. [PMID: 31932949 DOI: 10.1007/s00441-019-03158-9] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Accepted: 11/28/2019] [Indexed: 02/06/2023]
Abstract
The worldwide prevalence of diabetes mellitus and obesity is rapidly increasing not only in adults but also in children and adolescents. Diabetes is associated with macrovascular complications increasing the risk for cardiovascular disease and stroke, as well as microvascular complications leading to diabetic nephropathy, retinopathy and neuropathy. Animal models are essential for studying disease mechanisms and for developing and testing diagnostic procedures and therapeutic strategies. Rodent models are most widely used but have limitations in translational research. Porcine models have the potential to bridge the gap between basic studies and clinical trials in human patients. This article provides an overview of concepts for the development of porcine models for diabetes and obesity research, with a focus on genetically engineered models. Diabetes-associated ocular, cardiovascular and renal alterations observed in diabetic pig models are summarized and their similarities with complications in diabetic patients are discussed. Systematic multi-organ biobanking of porcine models of diabetes and obesity and molecular profiling of representative tissue samples on different levels, e.g., on the transcriptome, proteome, or metabolome level, is proposed as a strategy for discovering tissue-specific pathomechanisms and their molecular key drivers using systems biology tools. This is exemplified by a recent study providing multi-omics insights into functional changes of the liver in a transgenic pig model for insulin-deficient diabetes mellitus. Collectively, these approaches will provide a better understanding of organ crosstalk in diabetes mellitus and eventually reveal new molecular targets for the prevention, early diagnosis and treatment of diabetes mellitus and its associated complications.
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7
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Zou X, Ouyang H, Yu T, Chen X, Pang D, Tang X, Chen C. Preparation of a new type 2 diabetic miniature pig model via the CRISPR/Cas9 system. Cell Death Dis 2019; 10:823. [PMID: 31659151 PMCID: PMC6817862 DOI: 10.1038/s41419-019-2056-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2019] [Revised: 09/24/2019] [Accepted: 10/11/2019] [Indexed: 12/25/2022]
Abstract
Diabetes has become one of the major noninfectious diseases that seriously endanger public health. The formation of islet amyloid polypeptide (IAPP) affects the normal physiological functions of the body, such as glucose metabolism and lipid metabolism. The mature human IAPP protein (hIAPP) has a strong tendency to misfold and is considered to be one of the major causes of amyloid changes in islets. Deposition of hIAPP is considered to be one of the leading causes of type 2 diabetes mellitus (T2DM). Miniature pigs are experimental animal models that are well suited for research on gene function and human diabetes. In our study, we obtained IAPP gene-humanized miniature pigs via the CRISPR/Cas9 system and somatic cell nuclear transfer (SCNT) technology. The hIAPP pigs can be used to further study the pathogenesis and related complications of T2DM and to lay a solid foundation for the prevention and treatment of T2DM.
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Affiliation(s)
- Xiaodong Zou
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, Changchun, Jilin Province, People's Republic of China
| | - Hongsheng Ouyang
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, Changchun, Jilin Province, People's Republic of China
| | - Tingting Yu
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, Changchun, Jilin Province, People's Republic of China
| | - Xue Chen
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, Changchun, Jilin Province, People's Republic of China
| | - Daxin Pang
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, Changchun, Jilin Province, People's Republic of China
| | - Xiaochun Tang
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, Changchun, Jilin Province, People's Republic of China
| | - Chengzhen Chen
- Jilin Provincial Key Laboratory of Animal Embryo Engineering, College of Animal Sciences, Jilin University, Changchun, Jilin Province, People's Republic of China.
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8
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Numerical investigation of selective withdrawal in a pancreatic cell islet encapsulation apparatus. Comput Chem Eng 2018. [DOI: 10.1016/j.compchemeng.2018.09.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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9
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Smith KE, Purvis WG, Davis MA, Min CG, Cooksey AM, Weber CS, Jandova J, Price ND, Molano DS, Stanton JB, Kelly AC, Steyn LV, Lynch RM, Limesand SW, Alexander M, Lakey JRT, Seeberger K, Korbutt GS, Mueller KR, Hering BJ, McCarthy FM, Papas KK. In vitro characterization of neonatal, juvenile, and adult porcine islet oxygen demand, β-cell function, and transcriptomes. Xenotransplantation 2018; 25:e12432. [PMID: 30052287 DOI: 10.1111/xen.12432] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Revised: 04/20/2018] [Accepted: 05/24/2018] [Indexed: 12/19/2022]
Abstract
BACKGROUND There is currently a shortage of human donor pancreata which limits the broad application of islet transplantation as a treatment for type 1 diabetes. Porcine islets have demonstrated potential as an alternative source, but a study evaluating islets from different donor ages under unified protocols has yet to be conducted. METHODS Neonatal porcine islets (NPI; 1-3 days), juvenile porcine islets (JPI; 18-21 days), and adult porcine islets (API; 2+ years) were compared in vitro, including assessments of oxygen consumption rate, membrane integrity determined by FDA/PI staining, β-cell proliferation, dynamic glucose-stimulated insulin secretion, and RNA sequencing. RESULTS Oxygen consumption rate normalized to DNA was not significantly different between ages. Membrane integrity was age dependent, and API had the highest percentage of intact cells. API also had the highest glucose-stimulated insulin secretion response during a dynamic insulin secretion assay and had 50-fold higher total insulin content compared to NPI and JPI. NPI and JPI had similar glucose responsiveness, β-cell percentage, and β-cell proliferation rate. Transcriptome analysis was consistent with physiological assessments. API transcriptomes were enriched for cellular metabolic and insulin secretory pathways, while NPI exhibited higher expression of genes associated with proliferation. CONCLUSIONS The oxygen demand, membrane integrity, β-cell function and proliferation, and transcriptomes of islets from API, JPI, and NPI provide a comprehensive physiological comparison for future studies. These assessments will inform the optimal application of each age of porcine islet to expand the availability of islet transplantation.
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Affiliation(s)
- Kate E Smith
- Department of Physiological Sciences, University of Arizona, Tucson, AZ, USA.,Department of Surgery, University of Arizona, Tucson, AZ, USA
| | | | - Melissa A Davis
- School of Animal and Comparative Biomedical Sciences, University of Arizona, Tucson, AZ, USA
| | - Catherine G Min
- Department of Physiological Sciences, University of Arizona, Tucson, AZ, USA.,Department of Surgery, University of Arizona, Tucson, AZ, USA
| | - Amanda M Cooksey
- School of Animal and Comparative Biomedical Sciences, University of Arizona, Tucson, AZ, USA
| | - Craig S Weber
- Department of Physiology, University of Arizona, Tucson, AZ, USA
| | - Jana Jandova
- School of Animal and Comparative Biomedical Sciences, University of Arizona, Tucson, AZ, USA
| | | | - Diana S Molano
- Department of Surgery, University of Arizona, Tucson, AZ, USA
| | | | - Amy C Kelly
- School of Animal and Comparative Biomedical Sciences, University of Arizona, Tucson, AZ, USA
| | - Leah V Steyn
- Department of Surgery, University of Arizona, Tucson, AZ, USA
| | - Ronald M Lynch
- Department of Physiology, University of Arizona, Tucson, AZ, USA
| | - Sean W Limesand
- School of Animal and Comparative Biomedical Sciences, University of Arizona, Tucson, AZ, USA
| | - Michael Alexander
- Department of Surgery, University of California-Irvine, Orange, CA, USA
| | | | - Karen Seeberger
- Department of Surgery, Alberta Diabetes Institute, University of Alberta, Edmonton, AL, Canada
| | - Gregory S Korbutt
- Department of Surgery, Alberta Diabetes Institute, University of Alberta, Edmonton, AL, Canada
| | - Kate R Mueller
- Schulze Diabetes Institute, Department of Surgery, University of Minnesota, Minneapolis, MN, USA
| | - Bernhard J Hering
- Schulze Diabetes Institute, Department of Surgery, University of Minnesota, Minneapolis, MN, USA
| | - Fiona M McCarthy
- School of Animal and Comparative Biomedical Sciences, University of Arizona, Tucson, AZ, USA
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10
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Huang HH, Harrington S, Stehno-Bittel L. The Flaws and Future of Islet Volume Measurements. Cell Transplant 2018; 27:1017-1026. [PMID: 29954219 PMCID: PMC6158542 DOI: 10.1177/0963689718779898] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Revised: 03/09/2018] [Accepted: 04/01/2018] [Indexed: 11/17/2022] Open
Abstract
When working with isolated islet preparations, measuring the volume of tissue is not a trivial matter. Islets come in a large range of sizes and are often contaminated with exocrine tissue. Many factors complicate the procedure, and yet knowledge of the islet volume is essential for predicting the success of an islet transplant or comparing experimental groups in the laboratory. In 1990, Ricordi presented the islet equivalency (IEQ), defined as one IEQ equaling a single spherical islet of 150 μm in diameter. The method for estimating IEQ was developed by visualizing islets in a microscope, estimating their diameter in 50 μm categories and calculating a total volume for the preparation. Shortly after its introduction, the IEQ was adopted as the standard method for islet volume measurements. It has helped to advance research in the field by providing a useful tool improving the reproducibility of islet research and eventually the success of clinical islet transplants. However, the accuracy of the IEQ method has been questioned for years and many alternatives have been proposed, but none have been able to replace the widespread use of the IEQ. This article reviews the history of the IEQ, and discusses the benefits and failings of the measurement. A thorough evaluation of alternatives for estimating islet volume is provided along with the steps needed to uniformly move to an improved method of islet volume estimation. The lessons learned from islet researchers may serve as a guide for other fields of regenerative medicine as cell clusters become a more attractive therapeutic option.
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Affiliation(s)
- Han-Hung Huang
- Angelo State University, Texas Tech University System, San Angelo, TX, USA
| | | | - Lisa Stehno-Bittel
- Likarda, LLC, Kansas City, MO, USA
- University of Kansas Medical Center, Kansas City, KS, USA
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11
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Weegman BP, Taylor MJ, Baicu SC, Mueller K, O'brien TD, Wilson J, Papas KK. Plasticity and Aggregation of Juvenile Porcine Islets in Modified Culture: Preliminary Observations. Cell Transplant 2018; 25:1763-1775. [PMID: 27109912 DOI: 10.3727/096368916x691475] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Diabetes is a major health problem worldwide, and there is substantial interest in developing xenogeneic islet transplantation as a potential treatment. The potential to relieve the demand on an inadequate supply of human pancreata is dependent upon the efficiency of techniques for isolating and culturing islets from the source pancreata. Porcine islets are favored for xenotransplantation, but mature pigs (>2 years) present logistic and economic challenges, and young pigs (3-6 months) have not yet proven to be an adequate source. In this study, islets were isolated from 20 juvenile porcine pancreata (~3 months; 25 kg Yorkshire pigs) immediately following procurement or after 24 h of hypothermic machine perfusion (HMP) preservation. The resulting islet preparations were characterized using a battery of tests during culture in silicone rubber membrane flasks. Islet biology assessment included oxygen consumption, insulin secretion, histopathology, and in vivo function. Islet yields were highest from HMP-preserved pancreata (2,242 ± 449 IEQ/g). All preparations comprised a high proportion (>90%) of small islets (<100 μm), and purity was on average 63 ± 6%. Morphologically, islets appeared as clusters on day 0, loosely disaggregated structures at day 1, and transitioned to aggregated structures comprising both exocrine and endocrine cells by day 6. Histopathology confirmed both insulin and glucagon staining in cultures and grafts excised after transplantation in mice. Nuclear staining (Ki-67) confirmed mitotic activity consistent with the observed plasticity of these structures. Metabolic integrity was demonstrated by oxygen consumption rates = 175 ± 16 nmol/min/mg DNA, and physiological function was intact by glucose stimulation after 6-8 days in culture. In vivo function was confirmed with blood glucose control achieved in nearly 50% (8/17) of transplants. Preparation and culture of juvenile porcine islets as a source for islet transplantation require specialized conditions. These immature islets undergo plasticity in culture and form fully functional multicellular structures. Further development of this method for culturing immature porcine islets is expected to generate small pancreatic tissue-derived organoids termed "pancreatites," as a therapeutic product from juvenile pigs for xenotransplantation and diabetes research.
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Affiliation(s)
- Bradley P Weegman
- Department of Radiology, Center for Magnetic Resonance Research, University of Minnesota, Minneapolis, MN, USA.,Sylvatica Biotech, LLC, N. Charleston, SC, USA
| | - Michael J Taylor
- Sylvatica Biotech, LLC, N. Charleston, SC, USA.,Tissue Testing Technologies, LLC, N. Charleston, SC, USA.,Department of Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA, USA
| | - Simona C Baicu
- Tissue Testing Technologies, LLC, N. Charleston, SC, USA.,LifePoint, Inc., Charleston, SC, USA
| | - Kate Mueller
- Department of Surgery, University of Minnesota, Minneapolis, MN, USA
| | - Timothy D O'brien
- Veterinary Population Medicine Department, University of Minnesota, St. Paul, MN, USA
| | - John Wilson
- Wilson Wolf Manufacturing, New Brighton, MN, USA
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12
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Zhu H, Zhang X, He Y, Yu L, Lü Y, Pan K, Wang B, Chen G. [Research progress on the donor cell sources of pancreatic islet transplantation for treatment of diabetes mellitus]. ZHONGGUO XIU FU CHONG JIAN WAI KE ZA ZHI = ZHONGGUO XIUFU CHONGJIAN WAIKE ZAZHI = CHINESE JOURNAL OF REPARATIVE AND RECONSTRUCTIVE SURGERY 2018; 32:104-111. [PMID: 29806374 PMCID: PMC8414200 DOI: 10.7507/1002-1892.201707049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Revised: 12/13/2017] [Indexed: 11/03/2022]
Abstract
Objective To summarize the research progress on the source and selection of donor cells in the field of islet replacement therapy for diabetes mellitus. Methods Domestic and abroad literature concerning islet replacement therapy for diabetes mellitus, as well as donor source and donor selection was reviewed and analyzed thoroughly. Results The shortage of donor supply is still a major obstacle for the widely clinical application of pancreatic islet transplantation (PIT). Currently, in addition to the progress on the allogeneic/autologous donor islet supply, some remarkable achievements have been also attained in the application of xenogeneic islet (from pig donor), as well as islet like cells derived from stem cells and islet cell line, potentially enlarging the source of implantable cells. Conclusion Adequate and suitable donor cell supply is an essential prerequisite for widely clinical application of PIT therapy for type 1 diabetes mellitus (T1DM). Further perfection of organ donation system, together with development of immune-tolerance induction, gene and bioengineering technology etc. will possibly solve the problem of donor cell shortage and provide a basis for clinical application of cellular replacement therapy for T1DM.
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Affiliation(s)
- Haitao Zhu
- Department of Pediatrics (No. 3 Ward), Northwest Women's and Children's Hospital, Xi'an Shaanxi, 710061, P.R.China;Department of Hepatobiliary Surgery, the First Affiliated Hospital, Medical School of Xi'an Jiaotong University, Xi'an Shaanxi, 710061, P.R.China
| | - Xiaoge Zhang
- Department of Pediatrics (No. 3 Ward), Northwest Women's and Children's Hospital, Xi'an Shaanxi, 710061, P.R.China
| | - Yayi He
- Department of Endocrinology, the First Affiliated Hospital, Medical School of Xi'an Jiaotong University, Xi'an Shaanxi, 710061, P.R.China
| | - Liang Yu
- Department of Hepatobiliary Surgery, the First Affiliated Hospital, Medical School of Xi'an Jiaotong University, Xi'an Shaanxi, 710061, P.R.China
| | - Yi Lü
- Department of Hepatobiliary Surgery, the First Affiliated Hospital, Medical School of Xi'an Jiaotong University, Xi'an Shaanxi, 710061, P.R.China;Research Institute of Advanced Surgical Technology and Engineering, Xi'an Jiaotong University, Xi'an Shaanxi, 710061, P.R.China
| | - Kaili Pan
- Department of Pediatrics (No. 2 Ward), Northwest Women's and Children's Hospital, Xi'an Shaanxi, 710061, P.R.China
| | - Bo Wang
- Department of Hepatobiliary Surgery, the First Affiliated Hospital, Medical School of Xi'an Jiaotong University, Xi'an Shaanxi, 710061, P.R.China;Department of Endocrinology, the First Affiliated Hospital, Medical School of Xi'an Jiaotong University, Xi'an Shaanxi, 710061,
| | - Guoqiang Chen
- Department of Pediatrics (No. 3 Ward), Northwest Women's and Children's Hospital, Xi'an Shaanxi, 710061,
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13
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14
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Steffen A, Kiss T, Schmid J, Schubert U, Heinke S, Lehmann S, Bornstein S, Ludwig B, Ludwig S. Production of high-quality islets from goettingen minipigs: Choice of organ preservation solution, donor pool, and optimal cold ischemia time. Xenotransplantation 2017; 24. [PMID: 28130838 DOI: 10.1111/xen.12284] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2016] [Revised: 11/04/2016] [Accepted: 12/07/2016] [Indexed: 12/16/2022]
Abstract
BACKGROUND The transplantation of porcine islets into man might soon become reality for patients with type 1 diabetes mellitus. Therefore, porcine islets of high quality and quantity, and a scalable isolation process with strict quality control will be an unconditional prerequisite to enable the best possible transplantation graft. In this study, we provide a comparative study evaluating islet isolation outcome and in vitro survival based upon donor age, organ preservation solution (OPS), and cold ischemia time (CIT). METHODS Goettingen minipigs of younger age (1 year) and retired breeder animals (3.5 years) were studied. Pancreata were harvested according to the standards of human organ retrieval including in situ cold perfusion with either Custodiol® -HTK or Belzer® UW solution. Pancreatic tissue was characterized by quantification of apoptotic cells. Islet isolations were performed according to a modified Ricordi method, and isolation outcome was assessed by determining islet particle numbers (IP), islet equivalents (IEQ), and isolation factor (IF). Isolated islets were cultured for 24 and 48 h for the assessment of in vitro survival. RESULTS Islet viability was significantly higher in Custodiol® -HTK preserved pancreas organs compared to Belzer® UW. Furthermore, organs harvested from retired breeder preserved in Custodiol® -HTK resulted in stable islet isolation yields even after prolonged CIT and showed superior survival rates of islets in vitro compared to the Belzer® UW group. Younger porcine donor organs resulted generally in lower islet yield and survival rates. CONCLUSIONS In summary, Custodiol® -HTK solution should be preferred over Belzer® UW solution for the preservation of pancreata from porcine origin. Custodiol® -HTK allows for maintaining islet viability and promotes reproducible isolation outcome and survival even after longer CIT. The usage of retired breeder animals over young animals for islet isolation is highly advisable to yield high quality and quantity.
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Affiliation(s)
- Anja Steffen
- Department of Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany.,Paul Langerhans Institute Dresden of Helmholtz Centre Munich at University Clinic Carl Gustav Carus of TU Dresden Faculty of Medicine, Technische Universität Dresden, DZD-German Centre for Diabetes Research, Dresden, Germany
| | - Thomas Kiss
- Department of Anesthesiology and Intensive Care Medicine, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Janine Schmid
- Department of Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Undine Schubert
- Department of Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Sophie Heinke
- Department of Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Susann Lehmann
- Department of Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
| | - Stefan Bornstein
- Department of Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany.,Paul Langerhans Institute Dresden of Helmholtz Centre Munich at University Clinic Carl Gustav Carus of TU Dresden Faculty of Medicine, Technische Universität Dresden, DZD-German Centre for Diabetes Research, Dresden, Germany.,Center for Regenerative Therapies, Technische Universität Dresden, Dresden, Germany.,Diabetes and Nutritional Sciences, Rayne Institute, King's College London, London, UK
| | - Barbara Ludwig
- Department of Medicine III, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany.,Paul Langerhans Institute Dresden of Helmholtz Centre Munich at University Clinic Carl Gustav Carus of TU Dresden Faculty of Medicine, Technische Universität Dresden, DZD-German Centre for Diabetes Research, Dresden, Germany.,Center for Regenerative Therapies, Technische Universität Dresden, Dresden, Germany
| | - Stefan Ludwig
- Department of Visceral-, Thoracic- and Vascular Surgery, University Hospital Carl Gustav Carus, Technische Universität Dresden, Dresden, Germany
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Zhu HT, Lu L, Liu XY, Yu L, Lyu Y, Wang B. Treatment of diabetes with encapsulated pig islets: an update on current developments. J Zhejiang Univ Sci B 2016; 16:329-43. [PMID: 25990050 DOI: 10.1631/jzus.b1400310] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
The potential use of allogeneic islet transplantation in curing type 1 diabetes mellitus has been adequately demonstrated, but its large-scale application is limited by the short supply of donor islets and the need for sustained and heavy immunosuppressive therapy. Encapsulation of pig islets was therefore suggested with a view to providing a possible alternative source of islet grafts and avoiding chronic immunosuppression and associated adverse or toxic effects. Nevertheless, several vital elements should be taken into account before this therapy becomes a clinical reality, including cell sources, encapsulation approaches, and implantation sites. This paper provides a comprehensive review of xenotransplantation of encapsulated pig islets for the treatment of type 1 diabetes mellitus, including current research findings and suggestions for future studies.
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Affiliation(s)
- Hai-tao Zhu
- Heart Center, Northwest Women's and Children's Hospital, Xi'an 710061, China; Department of Hepatobiliary Surgery, the First Affiliated Hospital, Medical College, Xi'an Jiaotong University, Xi'an 710061, China; Department of Hand Surgery, China-Japan Union Hospital, Norman Bethune Health Science Center, Jilin University, Changchun 130033, China; Institute of Advanced Surgical Technology and Engineering, Xi'an Jiaotong University, Xi'an 710061, China
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Pancreatic Islets: Methods for Isolation and Purification of Juvenile and Adult Pig Islets. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2016; 938:35-55. [PMID: 27586421 DOI: 10.1007/978-3-319-39824-2_4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The current situation of organ transplantation is mainly determined by the disbalance between the number of available organs and the number of patients on the waiting list. This obvious dilemma might be solved by the transplantation of porcine organs into human patients. The metabolic similarities which exist between both species made pancreatic islets of Langerhans to that donor tissue which will be most likely transplanted in human recipients. Nevertheless, the successful isolation of significant yields of viable porcine islets is extremely difficult and requires extensive experiences in the field. This review is focussing on the technical challenges, pitfalls and particularities that are associated with the isolation of islets from juvenile and adult pigs considering donor variables that can affect porcine islet isolation outcome.
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17
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Zhu H, Yu L, He Y, Lyu Y, Wang B. Microencapsulated Pig Islet Xenotransplantation as an Alternative Treatment of Diabetes. TISSUE ENGINEERING PART B-REVIEWS 2015; 21:474-89. [PMID: 26028249 DOI: 10.1089/ten.teb.2014.0499] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Haitao Zhu
- Department of Hepatobiliary Surgery, First Affiliated Hospital, Medical College, Xi'an Jiaotong University, Xi'an, China
- Heart Center, Northwest Women's and Children's Hospital, Xi'an, China
| | - Liang Yu
- Department of Hepatobiliary Surgery, First Affiliated Hospital, Medical College, Xi'an Jiaotong University, Xi'an, China
| | - Yayi He
- Department of Endocrinology, First Affiliated Hospital, Medical College, Xi'an Jiaotong University, Xi'an, China
| | - Yi Lyu
- Department of Hepatobiliary Surgery, First Affiliated Hospital, Medical College, Xi'an Jiaotong University, Xi'an, China
- Institute of Advanced Surgical Technology and Engineering, Xi'an Jiaotong University, Xi'an, China
| | - Bo Wang
- Department of Hepatobiliary Surgery, First Affiliated Hospital, Medical College, Xi'an Jiaotong University, Xi'an, China
- Institute of Advanced Surgical Technology and Engineering, Xi'an Jiaotong University, Xi'an, China
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18
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Zhu HT, Yu L, Lyu Y, Wang B. Optimal pig donor selection in islet xenotransplantation: current status and future perspectives. J Zhejiang Univ Sci B 2015; 15:681-91. [PMID: 25091986 DOI: 10.1631/jzus.b1400120] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Islet transplantation is an attractive treatment of type 1 diabetes mellitus. Xenotransplantation, using the pig as a donor, offers the possibility of an unlimited supply of islet grafts. Published studies demonstrated that pig islets could function in diabetic primates for a long time (>6 months). However, pig-islet xenotransplantation must overcome the selection of an optimal pig donor to obtain an adequate supply of islets with high-quality, to reduce xeno-antigenicity of islet and prolong xenograft survival, and to translate experimental findings into clinical application. This review discusses the suitable pig donor for islet xenotransplantation in terms of pig age, strain, structure/function of islet, and genetically modified pig.
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Affiliation(s)
- Hai-tao Zhu
- Department of Hepatobiliary Surgery, the First Affiliated Hospital, Medical College, Xi'an Jiaotong University, Xi'an 710061, China
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19
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Taylor MJ, Baicu SC. Nonenzymatic Cryogenic Isolation of Therapeutic Cells: Novel Approach for Enzyme-Free Isolation of Pancreatic Islets Using In Situ Cryopreservation of Islets and Concurrent Selective Freeze Destruction of Acinar Tissue. Cell Transplant 2014; 23:1365-79. [DOI: 10.3727/096368913x672055] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Cell-based therapies, which all involve processes for procurement and reimplantation of living cells, currently rely upon expensive, inconsistent, and even toxic enzyme digestion processes. A prime example is the preparation of isolated pancreatic islets for the treatment of type 1 diabetes by transplantation. To avoid the inherent pitfalls of these enzymatic methods, we have conceptualized an alternative approach based on the hypothesis that cryobiological techniques can be used for differential freeze destruction of the pancreas (Px) to release islets that are selectively cryopreserved in situ. Pancreata were procured from juvenile pigs using approved procedures. The concept of cryoisolation is based on differential processing of the pancreas in five stages: 1) infiltrating islets in situ preferentially with a cryoprotectant (CPA) cocktail via antegrade perfusion of the major arteries; 2) retrograde ductal infusion of water to distend the acinar; 3) freezing the entire Px solid to lt; −160°C for storage in liquid nitrogen; 4) mechanically crushing and pulverizing the frozen Px into small fragments; 5) thawing the frozen fragments, filtering, and washing to remove the CPA. Finally, the filtered effluent (cryoisolate) was stained with dithizone for identification of intact islets and with Syto 13/PI for fluorescence viability testing and glucose-stimulated insulin release assessment. As predicted, the cryoisolate contained small fragments of residual tissue comprising an amorphous mass of acinar tissue with largely intact and viable (>90%) embedded islets. Islets were typically larger (range 50–500 μm diameter) than their counterparts isolated from juvenile pigs using conventional enzyme digestion techniques. Functionally, the islets from replicate cryoisolates responded to a glucose challenge with a mean stimulation index = 3.3 ± 0.7. An enzyme-free method of islet isolation relying on in situ cryopreservation of islets with simultaneous freeze destruction of acinar tissue is feasible and proposed as a new and novel method that avoids the problems associated with conventional collagenase digestion methods.
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Affiliation(s)
- Michael J. Taylor
- Cell and Tissue Systems, Inc., N. Charleston, SC, USA
- Carnegie Mellon University, Pittsburgh, PA, USA
| | - Simona C. Baicu
- Cell and Tissue Systems, Inc., N. Charleston, SC, USA
- Ocular and Tissue Recovery Operations, LifePoint, Inc., Charleston, SC, USA
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20
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Nagaraju S, Bottino R, Wijkstrom M, Trucco M, Cooper DKC. Islet xenotransplantation: what is the optimal age of the islet-source pig? Xenotransplantation 2014; 22:7-19. [DOI: 10.1111/xen.12130] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2014] [Accepted: 06/26/2014] [Indexed: 12/24/2022]
Affiliation(s)
- Santosh Nagaraju
- Thomas E. Starzl Transplantation Institute; University of Pittsburgh Medical Center; Pittsburgh PA USA
| | - Rita Bottino
- Division of Immunogenetics; Department of Pediatrics; Children's Hospital of Pittsburgh; University of Pittsburgh Medical Center; Pittsburgh PA USA
| | - Martin Wijkstrom
- Thomas E. Starzl Transplantation Institute; University of Pittsburgh Medical Center; Pittsburgh PA USA
| | - Massimo Trucco
- Division of Immunogenetics; Department of Pediatrics; Children's Hospital of Pittsburgh; University of Pittsburgh Medical Center; Pittsburgh PA USA
| | - David K. C. Cooper
- Thomas E. Starzl Transplantation Institute; University of Pittsburgh Medical Center; Pittsburgh PA USA
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Zhu HT, Wang WL, Yu L, Wang B. Pig-islet xenotransplantation: recent progress and current perspectives. Front Surg 2014; 1:7. [PMID: 25593932 PMCID: PMC4287008 DOI: 10.3389/fsurg.2014.00007] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Accepted: 03/07/2014] [Indexed: 01/23/2023] Open
Abstract
Islet xenotransplantation is one prospective treatment to bridge the gap between available human cells and needs of patients with diabetes. Pig represents an ideal candidate for obtaining such available cells. However, potential clinical application of pig islet still faces obstacles including inadequate yield of high-quality functional islets and xenorejection of the transplants. Adequate amounts of available islets can be obtained by selection of a suitable pathogen-free source herd and the development of isolation and purification method. Several studies demonstrated the feasibility of successful preclinical pig-islet xenotransplantation and provided insights and possible mechanisms of xenogeneic immune recognition and rejection. Particularly promising is the achievement of long-term insulin independence in diabetic models by means of distinct islet products and novel immunotherapeutic strategies. Nonetheless, further efforts are needed to obtain much more safety and efficacy data to translate these findings into clinic.
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Affiliation(s)
- Hai-Tao Zhu
- Department of Hepatobiliary Surgery, First Affiliated Hospital, Medical College, Xi’an Jiaotong University, Xi’an, China
| | - Wan-Li Wang
- Department of Hepatobiliary Surgery, First Affiliated Hospital, Medical College, Xi’an Jiaotong University, Xi’an, China
| | - Liang Yu
- Department of Hepatobiliary Surgery, First Affiliated Hospital, Medical College, Xi’an Jiaotong University, Xi’an, China
| | - Bo Wang
- Department of Hepatobiliary Surgery, First Affiliated Hospital, Medical College, Xi’an Jiaotong University, Xi’an, China
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Vakhshiteh F, Allaudin ZN, Mohd Lila MAB, Hani H. Size-related assessment on viability and insulin secretion of caprine islets in vitro. Xenotransplantation 2013; 20:82-8. [PMID: 23406308 DOI: 10.1111/xen.12023] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Accepted: 01/07/2013] [Indexed: 12/11/2022]
Abstract
BACKGROUND The successful isolation, purification, and culture of caprine islets has recently been reported. The present study shows arange of size distribution in caprine islet diameter from 50 to 250 μm, in which 80% of the total islet yield was comprised of small islets. METHODS Caprine islets were isolated and purified. Islets were handpicked and the diameter of the islets was recorded using light microscopy. Viablility of the islets was analyzed by confocal microscopy. Insulin secretion assay was carried out and analyzed by ELISA. RESULTS When tested at 48 h after isolation, these small islets were 29.3% more viable compared to the large-sized islets. Large islets showed a high ratio (P < 0.01) of central core necrosis (29.5% ± 1.92) whilst no significant core death was observed in small islets (2.33% ± 0.59). The annexin assay demonstrated 5.21% ± 0.97 and 7.34% ± 0.78 apoptotic death for small and large islets, respectively. During static incubation, small islets released 2.89-fold (1.39 ± 0.2 ng/IE) higher insulin level under low glucose induction (3.3 mm) and simultaneously 2.92-fold (2.95 ± 0.33 ng/IE) more insulin under high glucose condition (16.7 mm) in comparison to large islets at the same islet equivalents (P < 0.05). CONCLUSION The present findings evidenced the superior quality of smaller caprine islets compared to larger ones under an optimized basal maintenance condition. As it is equally important to preserve the quality of larger caprine islets, this work warrants further investigation on special culture conditions to support these islets.
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Affiliation(s)
- Faezeh Vakhshiteh
- Institute of Bioscience, Universiti Putra Malaysia, 43300 Serdang, Selangor, Malaysia
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23
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Vériter S, Aouassar N, Beaurin G, Goebbels RM, Gianello P, Dufrane D. Improvement of pig islet function by in vivo pancreatic tissue remodeling: a "human-like" pig islet structure with streptozotocin treatment. Cell Transplant 2012; 22:2161-73. [PMID: 23051152 DOI: 10.3727/096368912x657864] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Pig islets demonstrate significantly lower insulin secretion after glucose stimulation than human islets (stimulation index of ∼12 vs. 2 for glucose 1 and 15 mM, respectively) due to a major difference in β- and α-cell composition in islets (60% and 25% in humans and 90% and 8% in pigs, respectively). This leads to a lower rise in 3',5'-cyclic adenosine monophosphate (cAMP) in pig β-cells. Since glucagon is the major hormonal effector of cAMP in β-cells, we modified pig islet structure in vivo to increase the proportion of α-cells per islet and to improve insulin secretion. Selected doses (0, 30, 50, 75, and 100 mg/kg) of streptozotocin (STZ) were intravenously injected in 32 young pigs to assess pancreatic (insulin and glucagon) hormone levels, islet remodeling (histomorphometry for α- and β-cell proportions), and insulin and glucagon secretion in isolated islets. Endocrine structure and hormonal content of pig islets were compared with those of human islets. The dose of STZ was significantly correlated with reductions in pancreatic insulin content (p< 0.05, r(2) = 0.77) and the proportion of β-cells (p < 0.05, r(2) = 0.88). A maximum of 50 mg/kg STZ was required for optimal structure remodeling, with an increased proportion of α-cells per islet (26% vs. 48% α-cells per islet for STZ <50 mg/kg vs. >75 mg/kg; p < 0.05) without β-cell dysfunction. Three months after STZ treatment (30/50 mg/kg STZ), pig islets were isolated and compared with isolated control islets (0 mg/kg STZ). Isolated islets from STZ-treated (30/50 mg/kg) pigs had a higher proportion of α-cells than those from control animals (32.0% vs. 9.6%, respectively, p < 0.05). After in vitro stimulation, isolated islets from STZ-treated pigs demonstrated significantly higher glucagon content (65.4 vs. 21.0 ng/ml, p < 0.05) and insulin release (144 µU/ml) than nontreated islets (59 µU/ml, p < 0.05), respectively. Low-dose STZ (<50 mg/kg) can modify the structure of pig islets in vivo and improve insulin secretion after isolation.
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Affiliation(s)
- Sophie Vériter
- Pôle de Chirurgie Expérimentale et Transplantation, Laboratory of Experimental Surgery, Université Catholique de Louvain, Secteur des Sciences de la Santé, Brussels, Belgium
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Dufrane D, Gianello P. Pig islet for xenotransplantation in human: structural and physiological compatibility for human clinical application. Transplant Rev (Orlando) 2012; 26:183-8. [DOI: 10.1016/j.trre.2011.07.004] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2011] [Revised: 04/28/2011] [Accepted: 07/05/2011] [Indexed: 11/25/2022]
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Abstract
Pig islet xenotransplantation is effective in treating diabetes. Nowadays, the research of islet xenotransplantation is still in the research phase, and its clinical use is mainly restricted by the shortage of functional islets and graft rejection. In recent years, several studies have demonstrated the feasibility of successful preclinical pig islet xenotransplantation. Moreover, promising results concerning prolonged insulin independence were achieved with the improvement of islet isolation technologies, application of novel immunotherapeutic strategies, and the development of transplantation surgery. This review aims to elucidate the advances in the separation and preparation of transplanted pig islet, immunological rejection and treatments, potential safety problems, and clinical studies.
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Kinasiewicz J, Antosiak-Iwańska M, Sabat M. Histomorphometrical analysis of porcine islets of Langerhans. Transplant Proc 2012; 43:3105-6. [PMID: 21996237 DOI: 10.1016/j.transproceed.2011.08.022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Xenotransplantation of pig islets of Langerhans may be an efficient method for treatment of type I diabetic patients. Considering the shortage of human pancreas donors, pigs offer readily available islet source. Unfortunately, their morphologic characteristics makes isolation of pig islets of Langerhans extremely difficult. The selection of a suitable donor may favorably affect the success of isolation. Therefore, we examined pig breeds and weights for their influence histomorphometric features of Langerhans islets. Pancreatic tissue biopsy specimens were obtained from Polish Large White pigs (n=5), Polish Landrace pigs (n=8), Pietrain pigs (n=4), and marked-weight pigs of 100 kg (n=8) or more than 200 kg (n=10). Biopsy specimens were fixed and stored in 4% formaldehyde. Tissue sections were stained with polyclonal guinea pig anti-insulin antibody. The number of islets per 1 cm2 was counted in each section. Mean diameters and areas of the islets were measured to calculate the percentage volume density. Differences were observed among the groups of pigs weighing 200 kg and 100 kg in islet mean diameter and area. The number of islets/cm2 was higher among Pietrain than Polish Landrace pigs (425.45±111.7 versus 315.33±36.59 islet/cm2, P<.05). Furthermore, Pietrain pigs showed the largest volume density (1.44%). Histological analysis revealed that Pietrain pigs of 100 kg and market-weight pigs of 200 kg were the best donors for islets of Langerhans.
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Affiliation(s)
- J Kinasiewicz
- Nałęcz Institute of Biocybernetics and Biomedical Engineering, Polish Academy of Sciences, Warsaw, Poland.
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Mohanasundaram D, Drogemuller C, Brealey J, Jessup CF, Milner C, Murgia C, Lang CJ, Milton A, Zalewski PD, Russ GR, Coates PT. Ultrastructural analysis, zinc transporters, glucose transporters and hormones expression in New world primate (Callithrix jacchus) and human pancreatic islets. Gen Comp Endocrinol 2011; 174:71-9. [PMID: 21821034 DOI: 10.1016/j.ygcen.2011.07.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2010] [Revised: 07/12/2011] [Accepted: 07/21/2011] [Indexed: 11/25/2022]
Abstract
The New world primates (NWP) Callithrix jacchus separated from man approximately 50 million years ago and is a potential alternative small non-human primate model for diabetes research. Ultrastructure, and gene expression of pancreatic islets and the recently described diabetes auto antigenic zinc transporters families in human, NWP and pig pancreas were studied. Morphologically NWP islets were larger than pig islets and similar in size to human islets. NWP islets alpha cells had high dense core surrounded by a limiting membrane, beta cells by the mixed morphology of the granule core, and delta cells by moderate opaque core. Antibody staining for insulin, glucagon, somatostatin and Glucagon-like peptide-1 (GLP-1) showed that the distribution pattern of the different cell types within islets was comparable to pig and human islets. In all three species protein expression of zinc transporter ZnT8 was detected in most of the insulin producing beta cells whereas Zip14 expression was widely expressed in alpha and beta cells. In both human and NWP little or no expression of Glut2 was observed compared to Glut1 and glucokinase at the protein level, however the messenger RNA level of Glut2 was greater than Glut1 and glucokinase. In contrast all three glucose transporters were expressed in pig islets at the protein level. The expression of Zip14 in islets is reported for the first time. In conclusion NWP pancreatic islets express comparable islet cell types and distribution to humans and pigs. Importantly, marmosets have a similar glucose transporter profile to humans, making this non-endangered primate species a useful animal model for pancreatic biology.
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Affiliation(s)
- Daisy Mohanasundaram
- Central Northern Adelaide Renal and Transplantation Services, South Australian and Northern Territory Islet Program and Australian Islet Consortium, Royal Adelaide Hospital, Adelaide, Australia
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Islet surface PEGylation attenuate the instant blood-mediated inflammatory reaction in intrahepatic islet transplantation. Macromol Res 2011. [DOI: 10.1007/s13233-011-0904-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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The influence of porcine pancreas digestion parameters and islet histomorphology on islet isolation outcome. Pol J Vet Sci 2011; 14:227-30. [DOI: 10.2478/v10181-011-0034-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The influence of porcine pancreas digestion parameters and islet histomorphology on islet isolation outcomeTransplantation of the pig islets of Langerhans is considered as the future treatment for patients suffering from type Idiabetes mellitus. Despite the adaptation of modified Ricordi method and highly purified collagenase, the results of pancreas digestions are precarious. Selection of proper donor and optimal digestion procedure are fundamental. The aim of this study was to assess the impact of pancreas procuring parameters on pig islets yield. The pancreata were harvested from 69 market sows weighting over 150 kg. After intraductal injection of cold collagenase solution pancreata were transported in UW solution or under conditions of two layer method (TLM). In laboratory pancreata were digested at 37°C according to Ricordi isolation method or stationary in the bottle. The particular parameters of isolation procedure were considered as substantial. Pig weight, volume of infused collagenase solution, TLM application and pancreas dividing before digestion positively affected islet yield. Additionally, the influence of pancreatic islet tissue histomorphology on isolation outcome was studied. Proper donor selection as well as adequate digestion parameters could improve pig islet recovery during islet isolation.
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Alginate macroencapsulation of pig islets allows correction of streptozotocin-induced diabetes in primates up to 6 months without immunosuppression. Transplantation 2011; 90:1054-62. [PMID: 20975626 DOI: 10.1097/tp.0b013e3181f6e267] [Citation(s) in RCA: 157] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND This study assessed the capacity of alginate-encapsulated islets to reverse diabetes in a pig-to-primate model. METHODS Adult pig islets were encapsulated in microcapsules implanted under the kidney capsule (n=4) or in a subcutaneous macrodevice (n=5) in diabetic primates. Fasting blood glucose (FBG), insulin, porcine C-peptide, glycosylated hemoglobin (HbA1C), and cellular and humoral responses were followed. RESULTS Nonencapsulated pig islets were rejected within 7 days. A transient decrease of FBG was observed only during the 2 weeks after microencapsulated pig islet implantation under the kidney capsule. After subcutaneous transplantation of a macrodevice, diabetes was corrected up to a maximum of 6 months in five animals: FBG less than 107 mg/dL and HbA1C at 8% ± 1.4%. Two of the five animals received a new macrodevice between 25 and 35 weeks after the first graft dysfunction (HbA1C ≥ 13), and diabetes was controlled for an additional 18 weeks in these animals. Although a strong humoral response was elicited after transplantation of encapsulated islets, a total impermeability of alginate 3% wt/vol to IgG was demonstrated before and up to 20 weeks after transplantation of the subcutaneous macrodevice. CONCLUSIONS Pig islets encapsulated in a subcutaneous macrodevice can control diabetes up to 6 months without immunosuppression.
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Hilling DE, Rijkelijkhuizen JK, Marang-van de Mheen PJ, Töns A, Terpstra OT, Bouwman E. Morphological changes of porcine islets of Langerhans after collagenase and HBSS infusion of the pancreas. Xenotransplantation 2010; 17:413-7. [DOI: 10.1111/j.1399-3089.2010.00619.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Rijkelijkhuizen JKRA, Töns A, Terpstra OT, Bouwman E. Transplantation of Long-term Cultured Porcine Islets in the Rat: Prolonged Graft Survival and Recipient Growth on Reduced Immunosuppression. Cell Transplant 2010; 19:387-98. [DOI: 10.3727/096368909x484257] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
To evaluate whether further improvement in porcine islet xenotransplantation is feasible, a number of questions were addressed. Earlier we showed significant improvement in the nude mouse of the porcine islets by selection through long-term culture. Now these islets were tested in the stringent pig-to-rat model. Islets were isolated from adult pigs, cultured for 1.5–3 weeks and transplanted to rats. Possible rejection mechanisms were assessed by interference of the cellular response with cyclosporine A (CsA), blocking macrophages with gadolinium chloride (GdCl), and suppressing the humoral response with cyclophosphamide. Modifications in graft size and condition were analyzed. Untreated control recipients showed primary nonfunction (PNF). CsA treatment could fully overcome PNF and resulted in graft survival from 10 to over 134 days. Rejection was the main cause of function loss. Although rejection could not be prevented by intensifying the induction therapy, increased maintenance immunosuppression effectively blocked rejection, albeit at the expense of toxicity. Blocking the humoral response was ineffective; all grafts showed PNF. In contrast, depletion of macrophages fully prevented PNF. Combination of GdCl and CsA gave no additional effect, and grafts were rejected between 57 and 162 days. Generally, graft survivals were similar to those reported in the literature; however, long-term cultured islets required much less maintenance immunosuppression. Cessation of graft function was not always due to rejection; in some cases “islet exhaustion” was found, possibly caused by discrepancy between the graft size and the rapidly growing recipient. Neither the presence of damaged islet tissue in the graft nor the size of the graft exerted any influence on graft survival. On rejection, no real infiltration of the graft was seen; destruction gradually processed from the outside. The good functional capability of the cultured islets was illustrated by disappearance of the clinical symptoms and increase in body weight, which almost doubled in the long-term survivors.
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Affiliation(s)
| | - Annemiek Töns
- Department of Surgery, Leiden University Medical Centre, Leiden, The Netherlands
| | - Onno T. Terpstra
- Department of Surgery, Leiden University Medical Centre, Leiden, The Netherlands
| | - Eelco Bouwman
- Department of Surgery, Leiden University Medical Centre, Leiden, The Netherlands
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Taylor MJ, Baicu S, Greene E, Vazquez A, Brassil J. Islet isolation from juvenile porcine pancreas after 24-h hypothermic machine perfusion preservation. Cell Transplant 2010; 19:613-28. [PMID: 20149300 DOI: 10.3727/096368910x486316] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
Pancreas procurement for islet isolation and transplantation is limited by concerns for the detrimental effects of postmortem ischemia. Hypothermic machine perfusion (HMP) preservation technology has had a major impact in circumventing ischemic injury in clinical kidney transplantation and is applied here to the preservation and procurement of viable islets after hypothermic perfusion preservation of porcine pancreata because pigs are now considered the donor species of choice for xenogeneic islet transplantation. Pancreases were surgically removed from young (<6 months) domestic Yorkshire pigs (25-32 kg), either before or after 30 min of warm ischemia time (WIT), and cannulated for perfusion. Each pancreas was assigned to one of six preservation treatment groups: fresh controls-processed immediately (cold ischemia <1 h) (G1, n = 7); static cold storage-flushed with cold UW-Viaspan and stored in UW-Viaspan at 2-4 degrees C for 24 h with no prior WIT (G2, n = 9); HMP perfused on a LifePort(R) machine at 4-6 degrees C and low pressure (10 mmHg) for 24 h with either KPS1 solution (G3, n = 7) or Unisol-UHK (G4, n = 7). Additional treatment groups to evaluate the effects of prior warm ischemia examined islet isolation after 30 min WIT in situ without (G5, n = 6) or with subsequent 24-h HMP with KPS1 (G6, n = 7). The pancreas was intraductally distended with Liberase PI enzyme and normothermically digested. The isolated islets were purified by a continuous density-gradient centrifugation. Perfusion-induced glandular edema was G3 = 138 +/- 19%, G4 = 160 +/- 16%, and G6 = 127 +/- 22%. Islet yield (IEQ/g of pancreas) varied between the groups: G1 = 1,425 +/- 610, G2 = 1,002 +/- 262, G3 = 2,242 +/- 449 (p < 0.05 vs. G2), G4 = 1,901 +/- 420 (p < 0.05 vs. G2), G5 = 1,756 +/- 329, and G6 = 1,396 +/- 243. Islet stimulation indices were equivalent between the groups and similar to controls (G1). Insulin content (ng/IE) was different between the treatment groups with the highest insulin content in islets harvested from HMP pancreata. Dithizone staining for islets consistently showed more uniform digestion of the perfused organs, with greater separation of the tissue, less entrapped islets, and higher islet yield and purity. The salutary effects of HMP for 24 h were also manifest after 30-min prior warm ischemia. We conclude that 24 h of HMP is well tolerated, leading to moderate edema but no loss of function of the harvested islets. The edema appears to aid in enzymatic digestion, producing a greater yield and purity of islets compared with pancreas subjected to 24 h of static cold storage.
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YEOM HJ, SHIN KJ, KIM JS, KIM SJ, LEE S, PAUL S, HAN JW, AHN C, SEONG JK, CHUNG J, HWANG SY. Porcine aortic endothelial cell genes responsive to selected inflammatory stimulators. J Vet Med Sci 2010; 71:1499-508. [PMID: 19959902 DOI: 10.1292/jvms.001499] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Use of porcine tissues has been suggested as a promising solution for severe shortage of transplantable human organs. The immediate hurdle for xenotransplantation is acute immune/inflammatory vascular rejection of the transplant. Because endothelial cells play a key role in the initiation and the amplification of inflammation, alteration of gene expression in human endothelial cells, by various inflammatory stimulators has been studied extensively. However, transcriptional changes induced by human and other inflammatory stimulators in porcine endothelial cells have thus far not been studied. In this study, we treated porcine endothelial cells with human tumor necrosis factor (TNF)-alpha, porcine interferon (IFN)-gamma, H(2)O(2) and lypopolysaccharide (LPS) and profiled transcriptional change at 1 hr, 6 hr and 24 hr, using pig oligonucleotide 13K microarray. We found that mRNA species such as chemokine (C-X-C motif) ligand 6 (CXCL6) and Cathepsin S were significantly induced in porcine endothelial cells, as was previously reported with human endothelial cell. We also found that mRNA species including secreted frizzled-related protein 2 (SFRP2), radical S-adenosyl methionine domain containing 2 (RSAD2), structure specific recognition protein 1 (SSRP1) also were highly overexpressed in porcine endothelial cells. This result shows clues to understand underlying mechanisms of xenotransplantation rejection and the highly responsive porcine genes may serve as novel targets to be regulated for improving the function of grafted porcine donor organs.
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Affiliation(s)
- Hye-Jung YEOM
- Department of Biochemistry, Hanyang University & GenoCheck Co. Ltd, Ansan, Gyeonggi, South Korea
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Abstract
PURPOSE OF REVIEW Allogeneic islet transplantation faces difficulties because organ shortage is recurrent; several pancreas donors are often needed to treat one diabetic recipient; and the intrahepatic site of islet implantation may not be the most appropriate one. Another source of insulin-producing cells, therefore, would be of major interest, and pigs represent a possible and serious source for obtaining such cells. RECENT FINDINGS Pig islet grafts may appear difficult because of the species barrier, but recent studies demonstrate that pig islets may function in diabetic primates for at least 6 months. SUMMARY Pig islet xenotransplantation, however, must still overcome the selection of a suitable pig donor to translate preclinical findings into clinical applications. This review summarizes the actual acquired knowledge of pig islet transplantation in primates to select the 'ideal' pig donor.
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Dufrane D, Maillart JF, Aouassar N, Goebbels RM, Guiot Y, Gianello P. Native pancreatic alpha-cell adaptation in streptozotocin-induced diabetic primates: importance for pig islet xenotransplantation. Xenotransplantation 2009; 16:152-63. [PMID: 19566655 DOI: 10.1111/j.1399-3089.2009.00530.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Metabolic compatibility between donor and recipient species is an important matter for pig islet xenotransplantation. Glucagon is a key hormone for the function of pig islets as well as control of hypoglycemia in the recipients of the islets. Because a discrepancy exists in the composition of glucagon cells of pig and human/primate islets, the present study was designed to determine the role of native recipient glucagon cells in the treatment of diabetes by islet transplantation in a "pig-to-primate" model. METHODS Streptozotocin-treated (50 mg/kg) monkeys (n = 12, follow-up of 6 to 231 days) were compared with non-diabetic animals (n = 5; follow-up, 180 days). Metabolic [fasting and intravenous glucose tolerance tests (IVGTTs) for serum levels of glucose, insulin, glucagon] and morphologic (endocrine volume density and cell mass for insulin and glucagon) were compared between non-diabetic and diabetic animals. Six additional diabetic primates were given transplants of 15 000 adult pig islet equivalents without immunosuppression to monitor glucose, glucagon, insulin, and porcine C-peptide levels until 48 h after transplantation. RESULTS Elevated fasting blood glucose, pathologic IVGTT, destruction of 95% of beta-cell mass, and glycosylated hemoglobin (>13%) were assessed in diabetic monkeys. The serum glucagon levels and glucagon cell mass correlated significantly with diabetes time course of diabetes (R = 0.940, p = 0.005; R = 0.663, p = 0.019, respectively). A mean increase of 89% in glucagon cell mass was observed for primates suffering from diabetes >53 days. No response of glucagon secretion was observed for diabetic animals during IVGTT, because no increase of serum insulin levels followed glucose loading. Blood glucose levels dropped after pig islet xenografts in diabetic primates. This reduction was maintained by an insulin level >20 microU/ml over the period of time of xenograft function (porcine C-peptide >0.1 ng/ml). A total restoration of native primate glucagon sensitivity to insulin was found after pig islets xenotransplantation as revealed by a reduction of 80% of the glucagon level. When graft dysfunction (>24 h post-transplantation), the insulin level dropped and glucagon levels rose again (>50 pg/ml). CONCLUSIONS Native glucagon cells provide morphologic and functional plasticity to diabetes. Adult pig islet xenotransplantation can restore the sensitivity of primate glucagon to insulin but cannot protect the diabetic recipient against hypoglycemia.
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Affiliation(s)
- Denis Dufrane
- Faculté de Médecine, Laboratory of Experimental Surgery, Université catholique de Louvain, CHEX 5570, Avenue Hippocrate 55, Brussels, Belgium.
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Functional Improvement of Pig Islet With Exocrine Encapsulation. Transplant Proc 2009; 41:323-5. [DOI: 10.1016/j.transproceed.2008.10.077] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2008] [Revised: 08/29/2008] [Accepted: 10/20/2008] [Indexed: 11/21/2022]
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Affiliation(s)
- Sangeetha Prabhakaran
- Department of Surgery, Diabetes Institute for Immunology and Transplantation, University of Minnesota, Minneapolis, MN 55455, USA
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Abstract
Allogeneic islet transplantation faces difficulties because (1) organ shortage is recurrent; (2) several pancreas donors are often needed to treat one diabetic recipient; and (3) the intrahepatic site of islet implantation may not be the most appropriate site. Another source of insulin-producing cells, therefore, would be of major interest, and pigs represent a possible and serious source for obtaining such cells. Pig islet grafts may seem difficult because of the species barrier, but recent reports demonstrate that pig islets may function in primates for at least 6 months. Pig islet xenotransplantation, however, must still overcome several hurdles before becoming clinically applicable. The actual consensus is to produce more preclinical data in the pig-to-primate model as a necessary requirement to envisage any pig-to-human transplantation of islets; therefore, a summary of the actual acquired knowledge of pig islet transplantation in primates seemed useful and is summarized in this overview.
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Ozaki KI, Monnai M, Onoma M, Muramatsu H, Yogo K, Watanabe T, Oda Y, Katagiri K, Arakawa H, Itoh Z, Omura S, Takanashi H. Effects of mitemcinal (GM-611), an orally active erythromycin-derived prokinetic agent, on delayed gastric emptying and postprandial glucose in a new minipig model of diabetes. J Diabetes Complications 2008; 22:339-47. [PMID: 18413164 DOI: 10.1016/j.jdiacomp.2007.03.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2006] [Revised: 02/28/2007] [Accepted: 03/26/2007] [Indexed: 01/31/2023]
Abstract
AIMS This study was conducted to evaluate the suitability of a new minipig model for investigating aspects of diabetes such as delayed gastric emptying and glucose metabolism abnormalities, and to test the effects of mitemcinal (GM-611), an orally active erythromycin-derived motilin receptor agonist, on gastric emptying and postprandial glucose in normal and diabetic minipigs. METHODS AND RESULTS Intravenous injection of 300 mg/kg streptozotocin (STZ) to 5-week-old minipigs induced moderate hyperglycemia (about 200 mg/dl) for >80 weeks without insulin treatment. Decreased insulin production (P<.05), increased area under the glucose curve (P<.05), and slower glucose disappearance (P<.05) were demonstrated, and there was no severe inhibition of body weight gain, liver failure, or renal failure. Gastric emptying was significantly delayed in diabetic minipigs (P<.05) at 80 weeks, but not at 40 weeks, post-STZ. Oral administration of mitemcinal (5 mg/kg) at 80 weeks accelerated gastric emptying and induced a similar postprandial glucose profile in normal and diabetic minipigs with delayed gastric emptying. CONCLUSIONS The new diabetic minipig model showed suitability for investigating diabetes, gastric emptying, and plasma glucose excursions. Since delayed gastric emptying and irregular plasma glucose excursions are characteristic of diabetic gastroparesis, the accelerating and regulating effects of mitemcinal on this model add to the existing evidence that mitemcinal is likely to be useful for treating diabetic gastroparesis.
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Affiliation(s)
- Ken-ichi Ozaki
- Fuji-Gotemba Research Laboratories, Chugai Pharmaceutical Co., Ltd., Gotemba, Shizuoka 412-8513, Japan
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Arefanian H, Tredget EB, Rajotte RV, Korbutt GS, Gill RG, Rayat GR. Combination of anti-CD4 with anti-LFA-1 and anti-CD154 monoclonal antibodies promotes long-term survival and function of neonatal porcine islet xenografts in spontaneously diabetic NOD mice. Cell Transplant 2008; 16:787-98. [PMID: 18087999 DOI: 10.3727/000000007783465244] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Type 1 diabetes mellitus (T1DM) is caused by the autoimmune destruction of pancreatic islet beta-cells, which are required for the production of insulin. Islet transplantation has been shown to be an effective treatment option for TIDM; however, the current shortage of human islet donors limits the application of this treatment to patients with brittle T1DM. Xenotransplantation of pig islets is a potential solution to the shortage of human donor islets provided xenograft rejection is prevented. We demonstrated that a short-term administration of a combination of anti-LFA-1 and anti-CD154 monoclonal antibodies (mAbs) was highly effective in preventing rejection of neonatal porcine islet (NPI) xenografts in non-autoimmune-prone B6 mice. However, the efficacy of this therapy in preventing rejection of NPI xenografts in autoimmune-prone nonobese diabetic (NOD) mice is not known. Given that the current application of islet transplantation is for the treatment of T1DM, we set out to determine whether a combination of anti-LFA-1 and anti-CD154 mAbs could promote long-term survival of NPI xenografts in NOD mice. Short-term administration of a combination of anti-LFA-1 and anti-CD154 mAbs, which we found highly effective in preventing rejection of NPI xenografts in B6 mice, failed to promote long-term survival of NPI xenografts in NOD mice. However, addition of anti-CD4 mAb to short-term treatment of a combination of anti-LFA-1 and anti-CD154 mAbs resulted in xenograft function in 9/12 animals and long-term graft (>100 days) survival in 2/12 mice. Immunohistochemical analysis of islet grafts from these mice identified numerous insulin-producing beta-cells. Moreover, the anti-porcine antibody as well as autoreactive antibody responses in these mice was reduced similar to those observed in naive nontransplanted mice. These data demonstrate that simultaneous targeting of LFA-1, CD154, and CD4 molecules can be effective in inducing long-term islet xenograft survival and function in autoimmune-prone NOD mice.
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Affiliation(s)
- Hossein Arefanian
- Surgical-Medical Research Institute, Department of Surgery, University of Alberta, Edmonton, Alberta, Canada
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Dufrane D, Nenquin M, Henquin JC. Nutrient control of insulin secretion in perifused adult pig islets. DIABETES & METABOLISM 2007; 33:430-8. [PMID: 17584514 DOI: 10.1016/j.diabet.2007.05.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2007] [Revised: 04/24/2007] [Accepted: 05/03/2007] [Indexed: 12/25/2022]
Abstract
OBJECTIVES Xenotransplantation of pig islets is a potential solution to the shortage of human islets, but our knowledge of how these islets secrete insulin in response to nutrients is still fragmentary. This was the question addressed in the present study. METHODS After 24 h culture adult pig islets were perifused to characterize the dynamics of insulin secretion. Some responses were compared to those in human islets. RESULTS Increasing glucose from 1 to 15 mM weakly (approximately 2x) stimulated insulin secretion, which was potentiated (approximately 12x) by the cAMP-producing agent, forskolin. The effect of glucose was concentration-dependent (threshold at 3-5 mM and maximum at approximately 10 mM). The pattern of secretion was biphasic with a small first phase and an ascending second phase, and a paradoxical increase when the glucose concentration was abruptly lowered. Diazoxide abolished glucose-induced insulin secretion and tolbutamide reversed the inhibition. Glucose also increased secretion when islets were depolarized with tolbutamide or KCl. Insulin secretion was increased by leucine+glutamine, arginine, alanine or a mixture of amino acids, but their effect was significant only in the presence of forskolin. Upon stimulation by glucose alone, human islets secreted approximately 10x more insulin than pig islets, and the kinetics was characterized by a large first phase, a flat second phase, and rapid reversibility. CONCLUSIONS Compared with human islets, in vitro insulin secretion by adult pig islets is characterized by a different kinetics and a major quantitative deficiency that can be corrected by cAMP.
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Affiliation(s)
- D Dufrane
- Unit of Endocrinology and Metabolism, University of Louvain Faculty of Medicine, UCL 55.30, avenue Hippocrate 55, 1200 Brussels, Belgium
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Kim JH, Kim HI, Lee KW, Yu JE, Kim SH, Park HS, Park CG, Ihm SH, Ha J, Kim SJ, Lee HK, Ahn C, Park KS. Influence of strain and age differences on the yields of porcine islet isolation: extremely high islet yields from SPF CMS miniature pigs. Xenotransplantation 2007; 14:60-6. [PMID: 17214705 DOI: 10.1111/j.1399-3089.2006.00364.x] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Porcine pancreas is a potential source of material for islet xenotransplantation. However, the difficulty in isolating islets, because of their fragility and the variability of isolation outcome in donor age and breed, represents a major obstacle to porcine islet xenotransplantation. In this study, we compared the islet isolation yield of specific pathogen-free (SPF) Chicago Medical School (CMS) miniature pigs with that of another miniature pig breed and market pigs from a local slaughterhouse. METHODS Nine adult CMS miniature (ACM) pigs (>12 months), six young CMS miniature (YCM) pigs (6-7 months), four adult Prestige World Genetics (PWG) miniature (APM) pigs (>12 months), and 13 adult market (AM) pigs from a local slaughterhouse were used for islet isolation. RESULTS The islet yield per gram of pancreas from ACM pigs (9589 +/- 2823 IEQ/g) was significantly higher than that from APM pigs (1752 +/- 874 IEQ/g, P < 0.05), AM pigs (1931 +/- 947 IEQ/g, P < 0.05), or YCM pigs (3460 +/- 1985 IEQ/g, P < 0.05). Isolated islets from ACM pigs were significantly larger than those from AM pigs or YCM pigs. The in vitro and in vivo function of isolated islets showed no difference among experimental groups. The pancreases of ACM pigs contained higher mean islet volume density percentages and larger size of islets than those of AM or APM pigs. CONCLUSIONS We isolated extremely high yields of well-functioning islets from ACM pigs bred under SPF conditions. SPF CMS miniature pigs should be one of the best porcine islet donors for clinical porcine islet xenotransplantation.
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Affiliation(s)
- Jae Hyeon Kim
- Department of Internal Medicine, Seoul National University Boramae Hospital, Seoul, Korea
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Bottino R, Balamurugan AN, Smetanka C, Bertera S, He J, Rood PPM, Cooper DKC, Trucco M. Isolation outcome and functional characteristics of young and adult pig pancreatic islets for transplantation studies. Xenotransplantation 2007; 14:74-82. [PMID: 17214707 DOI: 10.1111/j.1399-3089.2006.00374.x] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
INTRODUCTION Pig islets have been proposed as an alternative to human islets for clinical use, but their use is limited by rejection. The availability of genetically modified pigs devoid of alpha1,3-galactosyltransferase might provide islets more suitable for xenotransplantation. To limit the costs involved in the logistics and health care of pigs for clinical xenotransplantation, we have studied whether younger, rather than older, pigs that are typically preferred can be used as islet donors. METHODS We utilized pancreases from Yorkshire and White Landrace wild-type pigs and alpha1,3-galactosyltransferase gene-knockout pigs of three main different age and size groups: (i) <6 months, (ii) 6 to 12 months, and (iii) >2 yr of age, inclusive of retired breeders. We compared isolation yield and in vitro and in vivo function of islet cells obtained from these groups. RESULTS Islets from adult pigs (>2 yr) offered not only higher islet yields, but retained the ability to preserve intact morphology during the isolation process and culture, in association with high functional properties after transplantation. Following isolation, islet cells from young (<6 m) and young-adult (6 to 12 m) pigs dissociated into small aggregates and single cells, and exhibited inferior functional properties than adult islets both in vitro and in vivo. CONCLUSIONS These data support the conclusion that, in view of the large number of islets needed to maintain normoglycemia after xenotransplantation, organ-source pigs need to reach adult age (>2 yr) before being considered optimal islet donors, in spite of the higher costs involved.
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Affiliation(s)
- Rita Bottino
- Division of Immunogenetics, Department of Pediatrics, Children's Hospital of Pittsburgh, Rangos Research Center, Pittsburgh, PA 15213, USA.
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Rood PPM, Bottino R, Balamurugan AN, Smetanka C, Ayares D, Groth CG, Murase N, Cooper DKC, Trucco M. Reduction of Early Graft Loss After Intraportal Porcine Islet Transplantation in Monkeys. Transplantation 2007; 83:202-10. [PMID: 17264817 DOI: 10.1097/01.tp.0000250680.36942.c6] [Citation(s) in RCA: 70] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND Pig islets constitute a possible resolution to the shortage of human islets for transplantation. After intraportal infusion of porcine islets in primates, many islets are lost through what has been termed the instant blood-mediated inflammatory reaction (IBMIR). We report on our experience with IBMIR. METHODS Ten monkeys underwent intraportal porcine islet transplantation. Immunosuppressive therapy was with conventional agents (n=3) or based on costimulation blockade (n=7). Treatment specific for IBMIR was administered in eight monkeys; two additional monkeys received no such therapy (group 1). Cobra venom factor completely inhibited complement activity in four (group 2) and dextran sulfate provided anticoagulation in four (group 3). Islet graft function was monitored by following blood glucose, insulin requirement, and porcine C-peptide values. RESULTS In monkeys that received neither cobra venom factor nor dextran sulfate (group 1), there was rapid destruction of islets indicated by severe hypoglycemia and the need for dextrose infusion; C-peptide levels were initially low and further reduction occurred within the first five days. In both groups 2 and 3, there was significantly less destruction of islets and some reversal of diabetes. However, when 40,000 IEQ/kg were infused, normoglycemia was lost within five days, but when 80,000 IEQ/kg were infused in one case, normoglycemia was more persistent. We observed that even when C-peptide levels were in the normal range for healthy nondiabetic pigs, these were not sufficient to maintain normoglycemia in the monkeys. CONCLUSIONS Although pretransplantation complement depletion or anticoagulation reduces porcine islet xenograft loss significantly, neither alone is sufficient to prevent IBMIR.
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Affiliation(s)
- Pleunie P M Rood
- Division of Immunogenetics, Department of Pediatrics, Children's Hospital of Pittsburgh, Pittsburgh, Pennsylvania, USA
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Dufrane D, D'hoore W, Goebbels RM, Saliez A, Guiot Y, Gianello P. Parameters favouring successful adult pig islet isolations for xenotransplantation in pig-to-primate models. Xenotransplantation 2006; 13:204-14. [PMID: 16756563 DOI: 10.1111/j.1399-3089.2006.00275.x] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND In the near future, adult porcine islets of Langerhans appear as an unlimited source of insulin-producing cells which could play a major role for treating diabetes mellitus. There is, however, an obvious lack of pre-clinical results and data in the pig-to-primate model. One of the main hurdles of this model is certainly related to the difficulty of reproducing regularly successful porcine islet isolation. This experimental work was designed to provide guidelines applicable in pig pancreas procurement and islet isolation for successful islet xenotransplantation into primates. METHODS Pancreases were harvested from adult Belgium Landrace pigs (n = 79) in a single centre. The impact on islet yield of (1) pancreas procurement (blood exsanguination and warm ischaemia time (WIT)), (2) cold storage solutions (classic UW and modified UW (without hydroxyethyl starch and inverse K+/Na+ concentration)), (3) a dynamic or static method of pancreas digestion, and (4) the endotoxin content and enzymatic activity from five different batches of Liberase PI was studied. In addition, pancreatic biopsies (n = 18), performed before isolation, were retrospectively analyzed to study the impact of histomorphometry on porcine islet yield. Finally, two diabetic cynomolgus monkeys were transplanted without immunosuppression with 15,000 pig islet equivalents/kg body weight of recipient to assess in vivo the function of freshly isolated islets. Univariate and multivariate analyses were performed. RESULTS By multiple linear regression, the most significant variables that significantly improved islet yield were, firstly, the presence of <30 EU (endotoxin units) of endotoxin in Liberase batches, followed by a WIT under 10 min and the use of blood exsanguination before pancreas harvesting (P < 0.005). In contrast, isolation method (dynamic vs. static) and the solution used for storage (short-term) (UW vs. modified UW) did not significantly influence islet yield. The correlation of retrospective histomorphometry analysis of native pancreas and extemporaneous biopsy before isolation clearly determined a positive relationship between isolated islet number and the number of islets/cm2 (r = 0.708, P < 0.01) or with the percentage of large islets (r = 0.680, P < 0.01) found in pancreas biopsies. Pig pancreases containing more than 82 islets/cm2 and more than 42% of large islets (>100 microm) thus enabled more than 120,000 islet equivalents to be obtained in 90% of the cases, which is an ideal amount of islets to transplant into a primate of 4 to 5 kg. In vivo, a reduction of blood glucose (<200 mg/dl), associated with porcine C-peptide production, was observed in two primates after transplantation with adult pig islets. At day 7 post-transplantation, however, loss of islet function was associated with graft destruction and immune reaction. CONCLUSIONS Morphological screening of the pig pancreas before isolation, optimal blood exsanguination, WIT <10 min, and an endotoxin content <30 EU/mg in Liberase PI batches determine successful pig islet isolation for xenotransplantation in primates.
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Affiliation(s)
- Denis Dufrane
- Laboratory of Experimental Surgery, Université Catholique de Louvain, Faculty of Medicine, Brussels, Belgium
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Balamurugan AN, Chang Y, Bertera S, Sands A, Shankar V, Trucco M, Bottino R. Suitability of human juvenile pancreatic islets for clinical use. Diabetologia 2006; 49:1845-54. [PMID: 16783471 DOI: 10.1007/s00125-006-0318-0] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/06/2006] [Accepted: 04/20/2006] [Indexed: 01/07/2023]
Abstract
AIMS/HYPOTHESIS The limited availability of deceased donor pancreases suitable for pancreas and islet transplantation calls for a broader utilisation of donor tissue for transplantation purposes. Young donors, representing, fortunately, a minor but significant pool of individuals, have been largely under-employed, mainly because of anatomical and functional incompatibilities with potential recipients. For islet transplantation, the isolation of pancreatic islets from young donors rarely occurs, because of technical problems. As a result of the peculiar characteristics of young donor pancreases, the standard isolation procedure does not allow efficient separation of the islets from the surrounding exocrine tissue, and favours the generation of mantled islets. Nonetheless, young donor islets offer high qualitative and clinically appealing characteristics. SUBJECTS AND METHODS We standardised a modified methodology to obtain purified and mantle-free human islets from young donors. This method principally involves efficient delivery of isolation enzyme with reduced mechanical disruption of the pancreas combined with additional filtration steps. RESULTS We were able to obtain purified and mantle-free human islets from donors as young as 6 months of age with good morphological and functional properties. The good qualitative characteristics of the islets, evidenced in vitro, were proven in vivo, as they were qualitatively superior to islets of older donors in transplantation studies. CONCLUSIONS/INTERPRETATION This study justifies the utilisation of islets derived from young donors for islet transplantation.
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Affiliation(s)
- A N Balamurugan
- Thomas E. Starzl Transplantation Institute, Department of Surgery, University of Pittsburgh, Pittsburgh, PA, USA
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Dufrane D, Goebbels RM, Saliez A, Guiot Y, Gianello P. Six-month survival of microencapsulated pig islets and alginate biocompatibility in primates: proof of concept. Transplantation 2006; 81:1345-53. [PMID: 16699465 DOI: 10.1097/01.tp.0000208610.75997.20] [Citation(s) in RCA: 147] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND Pig islets xenotransplantation remains associated with a strong humoral and cellular xenogeneic immune responses. The aim of this study was to assess the long-term biocompatibility of alginate encapsulated pig islets after transplantation in primates. METHODS Adult pig islets encapsulated in alginate under optimal conditions (n=7) or not (n=5) were transplanted under the kidney capsule of nondiabetic Cynomolgus maccacus. Additional primates received empty capsules (n=1) and nonencapsulated pig islets (n=2) as controls. Capsule integrity, cellular overgrowth, pig islet survival, porcine C-peptide and anti-pig IgM/IgG antibodies were examined up to 6 months after implantation. RESULTS Nonencapsulated islets and islets encapsulated in nonoptimal capsules were rapidly destroyed. In seven primates receiving perfectly encapsulated pig islets, part of the islets survived up to 6 months after implantation without immunosuppression. Porcine C-peptide was detected after 1 month in 71% of the animals. The majority of grafts (86%) were intact and completely free of cellular overgrowth or capsule fibrosis. Explanted capsules, after 135 (n=2/2) and 180 (n=2/3) days, demonstrated residual insulin content and responses to glucose challenge (stimulation index of 2.2). Partial islet survival was obtained despite an elicited anti-pig IgG humoral response. CONCLUSIONS Optimal alginate encapsulation significantly prolonged adult pig islet survival into primates for up to 6 months, even in the presence of antibody response.
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Affiliation(s)
- Denis Dufrane
- Laboratory of Experimental Surgery, Université catholique de Louvain, Faculté de Médecine, and Department of Pathology, Cliniques Universitaires Saint-Luc, Brussels, Belgium
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MacGregor RR, Williams SJ, Tong PY, Kover K, Moore WV, Stehno-Bittel L. Small rat islets are superior to large islets in in vitro function and in transplantation outcomes. Am J Physiol Endocrinol Metab 2006; 290:E771-9. [PMID: 16303846 DOI: 10.1152/ajpendo.00097.2005] [Citation(s) in RCA: 136] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Barriers to the use of islet transplantation as a practical treatment for diabetes include the limited number of available donor pancreata. This project was designed to determine whether the size of the islet could influence the success rate of islet transplantations in rats. Islets from adult rats were divided into two groups containing small (diameter <125 microm) or large (diameter >150 microm) islets. An average pancreas yielded three times more small islets than large. Smaller islets were approximately 20% more viable, with large islets containing a scattered pattern of necrotic and apoptotic cells or central core cell death. Small islets in culture consumed twice as much oxygen as large islets when normalized for the same islet equivalents. In static incubation, small islets released three times more insulin under basal conditions than did large islets. During exposure to high glucose conditions, the small islets released four times more insulin than the same islet equivalencies of large islets, and five times more insulin was released by the small islets in response to glucose and depolarization with K+. Most importantly, the small islets were far superior to large islets when transplanted into diabetic animals. When marginal islet equivalencies were used for renal subcapsular transplantation, large islets failed to produce euglycemia in any recipient rats, whereas small islets were successful 80% of the time. The results indicate that small islets are superior to large islets in in vitro testing and for transplantation into the kidney capsule of diabetic rats.
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Affiliation(s)
- R R MacGregor
- Dept. of Physical Therapy and Rehabilitation Sciences, Univ. of Kansas Medical Center, 3901 Rainbow Blvd., Kansas City, KS 66160, USA
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Dufrane D, van Steenberghe M, Guiot Y, Goebbels RM, Saliez A, Gianello P. Streptozotocin-induced diabetes in large animals (pigs/primates): role of GLUT2 transporter and beta-cell plasticity. Transplantation 2006; 81:36-45. [PMID: 16421474 DOI: 10.1097/01.tp.0000189712.74495.82] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
BACKGROUND To induce irreversible diabetes in large animals, the efficiency of streptozotocin (STZ) was evaluated in pigs, primates and compared to the gold standard model in rats. METHODS Low (50 mg/kg) and high (150 mg/kg) doses of STZ were tested. Hepatic/renal function, glucose metabolism (intravenous glucose tolerance tests, fasting blood glucose) and histomorphometry were evaluated prior to, 1, and 4 weeks after STZ treatment. RESULTS In rats and primates, expressing a high level of GLUT2 expression on beta cells, a dose of 50 mg/kg STZ induced irreversible diabetes (due to the 97% destruction of beta cell mass) without provoking liver or renal failure. In pigs, despite the use of high STZ dose, partial correction of hyperglycaemia was observed four weeks after STZ injection (decreased fasting blood glucose and intravenous glucose tolerance tests; increased insulin production). The correction of hyperglycaemia was associated with significant hypertrophy of immature pig beta-cell clusters (+30%, P<0.05), whereas no hypertrophy was observed in rats/primates. CONCLUSION These results demonstrated that STZ might be used to induce irreversible diabetes in rats and primates. In contrast, the low STZ sensitivity in pigs related to a low expression of GLUT2, higher number of immature beta cells and compensatory beta-cell hypertrophy, renders STZ-induced diabetes inappropriate for studying islet allografts in swine.
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Affiliation(s)
- Denis Dufrane
- Laboratory of Experimental Surgery, Université catholique de Louvain, Faculté de Médecine, Brussels, Belgium
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