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Kogata S, Lo PC, Maeda A, Okamatsu C, Sato K, Yamamoto R, Haneda T, Yoneyama T, Toyama C, Eguchi H, Masahata K, Kamiyama M, Okuyama H, Miyagawa S. Suppression of macrophage-mediated xenogeneic rejection by the ectopic expression of human CD177. Transpl Immunol 2022; 74:101663. [PMID: 35835297 DOI: 10.1016/j.trim.2022.101663] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 07/01/2022] [Accepted: 07/03/2022] [Indexed: 10/17/2022]
Abstract
Cellular xenogeneic rejection by the innate immune system is a major immunological obstruction that needs to be overcome for the successful clinical use of xenografts. Our focus has been on macrophage-mediated xenogeneic rejection, since suppressing macrophage function has considerable potential for practical applications in the area of xenotransplantation. We report herein on an investigation of the suppressive effect of human CD177 (hCD177) against macrophage-mediated xenogeneic rejection. Wild type swine aortic endothelial cell (SEC) and an SEC transfectant with hCD177 (SEC/hCD177) were co-cultured with macrophages, and the degree of cytotoxicity was evaluated by WST-8 assays, and phagocytosis was examined using Calcein-AM labeling methods. The expression of anti/pro-inflammatory cytokines was evaluated by RT-qPCR and the phosphorylation of SHP-1 on macrophages in co-culture was evaluated by Western blotting. The result of cytotoxicity assays indicated that hCD177 suppressed M1 macrophage-mediated xenogeneic rejection (vs. SEC, p < 0.0001). Similarly, the result of phagocytosis assays indicated that hCD177 suppressed it (vs. SEC, p < 0.05). In addition, hCD177 significantly suppressed the expression of IL-1β, a pro-inflammatory cytokine, in M1 macrophages (vs. SEC, p < 0.01). Luciferase assays using THP1-Lucia NF-kB also showed a significant difference in NF-kB activation (vs. SEC, p < 0.001). In addition, hCD177 was found to induce the phosphorylation of SHP-1 in M1 macrophages (vs. SEC, p < 0.05). These findings indicate that hCD177 suppresses M1 macrophage-mediated xenogeneic rejection, at least in part via in the phosphorylation of SHP-1.
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Affiliation(s)
- Shuhei Kogata
- Department of Pediatric Surgery, Osaka University Graduate School of Medicine, Osaka, Japan; Division of Pediatric Surgery, Department of Surgery, Kindai University Faculty of Medicine, Osaka, Japan
| | - Pei-Chi Lo
- Department of Pediatric Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Akira Maeda
- Department of Pediatric Surgery, Osaka University Graduate School of Medicine, Osaka, Japan.
| | - Chizu Okamatsu
- Department of Pediatric Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Kazuki Sato
- Department of Pediatric Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Riho Yamamoto
- Department of Pediatric Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Tomoko Haneda
- Department of Pediatric Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Tomohisa Yoneyama
- Department of Pediatric Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Chiyoshi Toyama
- Department of Pediatric Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Hiroshi Eguchi
- Department of Pediatric Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Kazunori Masahata
- Department of Pediatric Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Masafumi Kamiyama
- Department of Pediatric Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Hiroomi Okuyama
- Department of Pediatric Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Shuji Miyagawa
- Department of Pediatric Surgery, Osaka University Graduate School of Medicine, Osaka, Japan; Meiji University International Institute for Bio-Resource Research, Kanagawa, Japan
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2
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Nelson ED, Larson E, Joo DJ, Mao S, Glorioso J, Abu Rmilah A, Zhou W, Jia Y, Mounajjed T, Shi M, Bois M, Wood A, Jin F, Whitworth K, Wells K, Spate A, Samuel M, Minshew A, Walters E, Rinaldo P, Lillegard J, Johnson A, Amiot B, Hickey R, Prather R, Platt JL, Nyberg SL. Limited Expansion of Human Hepatocytes in FAH/RAG2-Deficient Swine. Tissue Eng Part A 2021; 28:150-160. [PMID: 34309416 PMCID: PMC8892989 DOI: 10.1089/ten.tea.2021.0057] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
BACKGROUND The mammalian liver's regenerative ability has led researchers to engineer animals as incubators for expansion of human hepatocytes. The expansion properties of human hepatocytes in immunodeficient mice are well known. However, little has been reported about larger animals that are more scalable and practical for clinical purposes. Therefore, we engineered immunodeficient swine to support expansion of human hepatocytes and identify barriers to their clinical application. METHODS Immunodeficient swine were engineered by knockout of recombinase activating gene 2 (RAG2) and fumarylacetoacetate hydrolase (FAH). Immature human hepatocytes (ihHCs) were injected into fetal swine by intrauterine cell transplantation (IUCT) at day 40 of gestation. Human albumin was measured as a marker of engraftment. Cytotoxicity against ihHCs was measured in transplanted piglets and control swine. RESULTS Higher levels of human albumin were detected in cord blood of newborn FAH/RAG2-deficient (FR) pigs compared to immunocompetent controls (196.26 ng/dL vs 39.29 ng/dL, p = 0.008), indicating successful engraftment of ihHC after IUCT and adaptive immunity in the fetus. Although rare hepatocytes staining positively for human albumin were observed, levels of human albumin did not rise after birth but declined suggesting rejection of xenografted ihHCs. Cytotoxicity against ihHCs increased after birth 3.8% (95% CI: [2.1%, 5.4%], p < 0.001) and correlated inversely to declining levels of human albumin (p = 2.1 x 10-5, R2 = 0.17). Circulating numbers of T-cells and B-cells were negligible in FR pigs. However, circulating natural killer (NK) cells exerted cytotoxicity against ihHCs. NK cell activity was lower in immunodeficient piglets after IUCT than naive controls (30.4% vs 40.1% (p = 0.011, 95% CI for difference [2.7%, 16.7%]). CONCLUSION Immature human hepatocytes successfully engrafted in FR swine after IUCT. NK cells were a significant barrier to expansion of hepatocytes. New approaches are needed to overcome this hurdle and allow large scale expansion of human hepatocytes in immunodeficient swine.
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Affiliation(s)
- Erek David Nelson
- Mayo Clinic Minnesota, 4352, Surgery, 100 First St NW, Rochester, Rochester, Minnesota, United States, 55905-0002;
| | - Ellen Larson
- Mayo Clinic Minnesota, 4352, Surgery, Rochester, Minnesota, United States;
| | - Dong Jin Joo
- Mayo Clinic Minnesota, 4352, Surgery, Rochester, Minnesota, United States;
| | - Shennen Mao
- Mayo Clinic Minnesota, 4352, Surgery, Rochester, Minnesota, United States;
| | - Jaime Glorioso
- Mayo Clinic Minnesota, 4352, Surgery, Rochester, Minnesota, United States;
| | - Anan Abu Rmilah
- Mayo Clinic Minnesota, 4352, Surgery, Rochester, Minnesota, United States;
| | - Wei Zhou
- Mayo Clinic Minnesota, 4352, Surgery, Rochester, Minnesota, United States;
| | - Yao Jia
- Mayo Clinic Minnesota, 4352, Surgery, Rochester, Minnesota, United States;
| | - Taofic Mounajjed
- Mayo Clinic Minnesota, 4352, Laboratory Medicine and Pathology, Rochester, Minnesota, United States;
| | - Min Shi
- Mayo Clinic Minnesota, 4352, Laboratory Medicine and Pathology, Rochester, Minnesota, United States;
| | - Melanie Bois
- Mayo Clinic Minnesota, 4352, Laboratory Medicine and Pathology, Rochester, Minnesota, United States;
| | - Adam Wood
- Mayo Clinic Minnesota, 4352, Laboratory Medicine and Pathology, Rochester, Minnesota, United States;
| | - Fang Jin
- Mayo Clinic Minnesota, 4352, Immunology, Rochester, Minnesota, United States;
| | - Kristin Whitworth
- University of Missouri, 14716, National Swine Resource and Research Center, Division of Animal Sciences, Columbia, Missouri, United States;
| | - Kevin Wells
- University of Missouri, 14716, National Swine Resource and Research Center, Division of Animal Sciences, Columbia, Missouri, United States;
| | - Anna Spate
- University of Missouri, 14716, National Swine Resource and Research Center, Division of Animal Sciences, Columbia, Missouri, United States;
| | - Melissa Samuel
- University of Missouri, 14716, National Swine Resource and Research Center, Division of Animal Sciences, Columbia, Missouri, United States;
| | - Anna Minshew
- Mayo Clinic Minnesota, 4352, Surgery, Rochester, Minnesota, United States;
| | - Eric Walters
- University of Missouri, 14716, National Swine Resource and Research Center, Division of Animal Sciences, Columbia, Missouri, United States;
| | - Piero Rinaldo
- Mayo Clinic Minnesota, 4352, Laboratory Medicine and Pathology, Rochester, Minnesota, United States;
| | - Joeseph Lillegard
- Mayo Clinic Minnesota, 4352, Surgery, Rochester, Minnesota, United States;
| | - Aaron Johnson
- Mayo Clinic Minnesota, 4352, Immunology, Rochester, Minnesota, United States;
| | - Bruce Amiot
- Mayo Clinic Minnesota, 4352, Surgery, Rochester, Minnesota, United States;
| | - Raymond Hickey
- Mayo Clinic Minnesota, 4352, Surgery, Rochester, Minnesota, United States;
| | - Randall Prather
- University of Missouri, 14716, National Swine Resource and Research Center, Division of Animal Sciences, Columbia, Missouri, United States;
| | - Jeffrey L Platt
- University of Michigan Michigan Medicine, 21614, Surgery, Ann Arbor, Michigan, United States;
| | - Scott Lyle Nyberg
- Mayo Clinic Minnesota, 4352, Surgery, Rochester, Minnesota, United States;
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Yoon CH, Choi HJ, Kim MK. Corneal xenotransplantation: Where are we standing? Prog Retin Eye Res 2021; 80:100876. [PMID: 32755676 PMCID: PMC7396149 DOI: 10.1016/j.preteyeres.2020.100876] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 05/23/2020] [Accepted: 06/04/2020] [Indexed: 02/08/2023]
Abstract
The search for alternatives to allotransplants is driven by the shortage of corneal donors and is demanding because of the limitations of the alternatives. Indeed, current progress in genetically engineered (GE) pigs, the introduction of gene-editing technology by clustered regularly interspaced short palindromic repeats (CRISPR)-Cas9, and advanced immunosuppressants have made xenotransplantation a possible option for a human trial. Porcine corneal xenotransplantation is considered applicable because the eye is regarded as an immune-privileged site. Furthermore, recent non-human primate studies have shown long-term survival of porcine xenotransplants in keratoplasty. Herein, corneal immune privilege is briefly introduced, and xenogeneic reactions are compared with allogeneic reactions in corneal transplantation. This review describes the current knowledge on special issues of xenotransplantation, xenogeneic rejection mechanisms, current immunosuppressive regimens of corneal xenotransplantation, preclinical efficacy and safety data of corneal xenotransplantation, and updates of the regulatory framework to conduct a clinical trial on corneal xenotransplantation. We also discuss barriers that might prevent xenotransplantation from becoming common practice, such as ethical dilemmas, public concerns on xenotransplantation, and the possible risk of xenozoonosis. Given that the legal definition of decellularized porcine cornea (DPC) lies somewhere between a medical device and a xenotransplant, the preclinical efficacy and clinical trial data using DPC are included. The review finally provides perspectives on the current standpoint of corneal xenotransplantation in the fields of regenerative medicine.
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Affiliation(s)
- Chang Ho Yoon
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Republic of Korea; Laboratory of Ocular Regenerative Medicine and Immunology, Seoul Artificial Eye Center, Seoul National University Hospital Biomedical Research Institute, Seoul, Republic of Korea
| | - Hyuk Jin Choi
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Republic of Korea; Laboratory of Ocular Regenerative Medicine and Immunology, Seoul Artificial Eye Center, Seoul National University Hospital Biomedical Research Institute, Seoul, Republic of Korea; Department of Ophthalmology, Seoul National University Hospital Healthcare System Gangnam Center, Seoul, Republic of Korea
| | - Mee Kum Kim
- Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Republic of Korea; Laboratory of Ocular Regenerative Medicine and Immunology, Seoul Artificial Eye Center, Seoul National University Hospital Biomedical Research Institute, Seoul, Republic of Korea.
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4
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Daugs A, Lehmann N, Eroglu D, Meinke MC, Markhoff A, Bloch O. In VitroDetection System to Evaluate the Immunogenic Potential of Xenografts. Tissue Eng Part C Methods 2018; 24:280-288. [DOI: 10.1089/ten.tec.2017.0532] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Affiliation(s)
- Aila Daugs
- Auto Tissue Berlin GmbH, Berlin, Germany
| | | | | | - Martina C. Meinke
- Center of Experimental and Applied Cutaneous Physiology, Charité—Universitätsmedizin Berlin, Berlin, Germany
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Samy KP, Davis RP, Gao Q, Martin BM, Song M, Cano J, Farris AB, McDonald A, Gall EK, Dove CR, Leopardi FV, How T, Williams KD, Devi GR, Collins BH, Kirk AD. Early barriers to neonatal porcine islet engraftment in a dual transplant model. Am J Transplant 2018; 18:998-1006. [PMID: 29178588 PMCID: PMC5878697 DOI: 10.1111/ajt.14601] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 10/24/2017] [Accepted: 11/14/2017] [Indexed: 01/25/2023]
Abstract
Porcine islet xenografts have the potential to provide an inexhaustible source of islets for β cell replacement. Proof-of-concept has been established in nonhuman primates. However, significant barriers to xenoislet transplantation remain, including the poorly understood instant blood-mediated inflammatory reaction and a thorough understanding of early xeno-specific immune responses. A paucity of data exist comparing xeno-specific immune responses with alloislet (AI) responses in primates. We recently developed a dual islet transplant model, which enables direct histologic comparison of early engraftment immunobiology. In this study, we investigate early immune responses to neonatal porcine islet (NPI) xenografts compared with rhesus islet allografts at 1 hour, 24 hours, and 7 days. Within the first 24 hours after intraportal infusion, we identified greater apoptosis (caspase 3 activity and TUNEL [terminal deoxynucleotidyl transferase dUTP nick end labeling])-positive cells) of NPIs compared with AIs. Macrophage infiltration was significantly greater at 24 hours compared with 1 hour in both NPI (wild-type) and AIs. At 7 days, IgM and macrophages were highly specific for NPIs (α1,3-galactosyltransferase knockout) compared with AIs. These findings demonstrate an augmented macrophage and antibody response toward xenografts compared with allografts. These data may inform future immune or genetic manipulations required to improve xenoislet engraftment.
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Affiliation(s)
- KP Samy
- Department of Surgery, Duke University School of Medicine, Durham, NC 27710
| | - RP Davis
- Department of Surgery, Duke University School of Medicine, Durham, NC 27710
| | - Q Gao
- Department of Surgery, Duke University School of Medicine, Durham, NC 27710
| | - BM Martin
- Emory Transplant Center, Emory University School of Medicine, Atlanta, GA 30322
| | - M Song
- Department of Surgery, Duke University School of Medicine, Durham, NC 27710
| | - J Cano
- Emory Transplant Center, Emory University School of Medicine, Atlanta, GA 30322
| | - AB Farris
- Department of Pathology & Laboratory Medicine, Emory University School of Medicine, Atlanta, GA 30322
| | - A McDonald
- Department of Surgery, Duke University School of Medicine, Durham, NC 27710
| | - EK Gall
- Department of Surgery, Duke University School of Medicine, Durham, NC 27710
| | - CR Dove
- College of Agricultural and Environmental Sciences, University of Georgia, Athens, GA 30602
| | | | - T How
- Department of Surgery, Duke University School of Medicine, Durham, NC 27710
| | - KD Williams
- Department of Surgery, Duke University School of Medicine, Durham, NC 27710
| | - GR Devi
- Department of Surgery, Duke University School of Medicine, Durham, NC 27710
| | - BH Collins
- Department of Surgery, Duke University School of Medicine, Durham, NC 27710
| | - AD Kirk
- Department of Surgery, Duke University School of Medicine, Durham, NC 27710,Emory Transplant Center, Emory University School of Medicine, Atlanta, GA 30322
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6
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Carwardine D, Prager J, Neeves J, Muir EM, Uney J, Granger N, Wong LF. Transplantation of canine olfactory ensheathing cells producing chondroitinase ABC promotes chondroitin sulphate proteoglycan digestion and axonal sprouting following spinal cord injury. PLoS One 2017; 12:e0188967. [PMID: 29228020 PMCID: PMC5724818 DOI: 10.1371/journal.pone.0188967] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2017] [Accepted: 11/16/2017] [Indexed: 11/19/2022] Open
Abstract
Olfactory ensheathing cell (OEC) transplantation is a promising strategy for treating spinal cord injury (SCI), as has been demonstrated in experimental SCI models and naturally occurring SCI in dogs. However, the presence of chondroitin sulphate proteoglycans within the extracellular matrix of the glial scar can inhibit efficient axonal repair and limit the therapeutic potential of OECs. Here we have used lentiviral vectors to genetically modify canine OECs to continuously deliver mammalian chondroitinase ABC at the lesion site in order to degrade the inhibitory chondroitin sulphate proteoglycans in a rodent model of spinal cord injury. We demonstrate that these chondroitinase producing canine OECs survived at 4 weeks following transplantation into the spinal cord lesion and effectively digested chondroitin sulphate proteoglycans at the site of injury. There was evidence of sprouting within the corticospinal tract rostral to the lesion and an increase in the number of corticospinal axons caudal to the lesion, suggestive of axonal regeneration. Our results indicate that delivery of the chondroitinase enzyme can be achieved with the genetically modified OECs to increase axon growth following SCI. The combination of these two promising approaches is a potential strategy for promoting neural regeneration following SCI in veterinary practice and human patients.
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Affiliation(s)
- Darren Carwardine
- School of Veterinary Sciences, University of Bristol, Bristol, United Kingdom
| | - Jonathan Prager
- School of Veterinary Sciences, University of Bristol, Bristol, United Kingdom
| | - Jacob Neeves
- School of Veterinary Sciences, University of Bristol, Bristol, United Kingdom
| | - Elizabeth M. Muir
- Department of Physiology Development and Neuroscience, University of Cambridge, Cambridge, United Kingdom
| | - James Uney
- Bristol Medical School, University of Bristol, Bristol, United Kingdom
| | - Nicolas Granger
- School of Veterinary Sciences, University of Bristol, Bristol, United Kingdom
| | - Liang-Fong Wong
- Bristol Medical School, University of Bristol, Bristol, United Kingdom
- * E-mail:
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7
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Beshr G, Sikandar A, Jemiller EM, Klymiuk N, Hauck D, Wagner S, Wolf E, Koehnke J, Titz A. Photorhabdus luminescens lectin A (PllA): A new probe for detecting α-galactoside-terminating glycoconjugates. J Biol Chem 2017; 292:19935-19951. [PMID: 28972138 DOI: 10.1074/jbc.m117.812792] [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: 08/17/2017] [Revised: 09/25/2017] [Indexed: 11/06/2022] Open
Abstract
Lectins play important roles in infections by pathogenic bacteria, for example, in host colonization, persistence, and biofilm formation. The Gram-negative entomopathogenic bacterium Photorhabdus luminescens symbiotically lives in insect-infecting Heterorhabditis nematodes and kills the insect host upon invasion by the nematode. The P. luminescens genome harbors the gene plu2096, coding for a novel lectin that we named PllA. We analyzed the binding properties of purified PllA with a glycan array and a binding assay in solution. Both assays revealed a strict specificity of PllA for α-galactoside-terminating glycoconjugates. The crystal structures of apo PllA and complexes with three different ligands revealed the molecular basis for the strict specificity of this lectin. Furthermore, we found that a 90° twist in subunit orientation leads to a peculiar quaternary structure compared with that of its ortholog LecA from Pseudomonas aeruginosa We also investigated the utility of PllA as a probe for detecting α-galactosides. The α-Gal epitope is present on wild-type pig cells and is the main reason for hyperacute organ rejection in pig to primate xenotransplantation. We noted that PllA specifically recognizes this epitope on the glycan array and demonstrated that PllA can be used as a fluorescent probe to detect this epitope on primary porcine cells in vitro In summary, our biochemical and structural analyses of the P. luminescens lectin PllA have disclosed the structural basis for PllA's high specificity for α-galactoside-containing ligands, and we show that PllA can be used to visualize the α-Gal epitope on porcine tissues.
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Affiliation(s)
- Ghamdan Beshr
- From the Divisions of Chemical Biology of Carbohydrates and.,the Deutsches Zentrum für Infektionsforschung (DZIF), Standort Hannover-Braunschweig.,the Department of Pharmacy, Saarland University, 66123 Saarbrücken, and
| | - Asfandyar Sikandar
- the Department of Pharmacy, Saarland University, 66123 Saarbrücken, and.,Structural Biology of Biosynthetic Enzymes, Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), D-66123 Saarbrücken
| | - Eva-Maria Jemiller
- the Chair for Molecular Animal Breeding and Biotechnology, Gene Center and Department of Veterinary Sciences, Ludwig Maximilian University of Munich, 81377 Munich, Germany
| | - Nikolai Klymiuk
- the Chair for Molecular Animal Breeding and Biotechnology, Gene Center and Department of Veterinary Sciences, Ludwig Maximilian University of Munich, 81377 Munich, Germany
| | - Dirk Hauck
- From the Divisions of Chemical Biology of Carbohydrates and.,the Deutsches Zentrum für Infektionsforschung (DZIF), Standort Hannover-Braunschweig
| | - Stefanie Wagner
- From the Divisions of Chemical Biology of Carbohydrates and.,the Deutsches Zentrum für Infektionsforschung (DZIF), Standort Hannover-Braunschweig
| | - Eckhard Wolf
- the Chair for Molecular Animal Breeding and Biotechnology, Gene Center and Department of Veterinary Sciences, Ludwig Maximilian University of Munich, 81377 Munich, Germany
| | - Jesko Koehnke
- the Department of Pharmacy, Saarland University, 66123 Saarbrücken, and .,Structural Biology of Biosynthetic Enzymes, Helmholtz Institute for Pharmaceutical Research Saarland (HIPS), D-66123 Saarbrücken
| | - Alexander Titz
- From the Divisions of Chemical Biology of Carbohydrates and .,the Deutsches Zentrum für Infektionsforschung (DZIF), Standort Hannover-Braunschweig.,the Department of Pharmacy, Saarland University, 66123 Saarbrücken, and
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8
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Born WK, Huang Y, Zeng W, Torres RM, O'Brien RL. A Special Connection between γδ T Cells and Natural Antibodies? Arch Immunol Ther Exp (Warsz) 2016; 64:455-462. [PMID: 27235134 PMCID: PMC5507014 DOI: 10.1007/s00005-016-0403-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Accepted: 04/04/2016] [Indexed: 12/15/2022]
Abstract
Natural antibodies (NAbs) play an important role in early host defense, autophagy and tissue remodeling, and in immune regulation. They arise spontaneously (without specific immunization), and are already present at birth. NAbs are produced by B1 B cells, MZ B cells and other B cell types. They include all major Ig subclasses but IgM antibodies are prevalent, especially early in development. NAbs may be poly-specific, recognize particular auto-antigens, or detect neo-determinants such as those exposed during apoptosis or generated by oxidation. NAbs do not require cognate T cell help but depend on soluble mediators produced by T cells. Our recent studies suggest that γδ T cells may have a special relationship with NAbs, and play a prominent role in their regulation, in part through the fine-tuning of IL-4 levels. The spontaneously activated state of these cells likely enables their cytokine production and other functions in the absence of external stimulation. Ontogenetically, the earlier arising γδ T cells are better positioned than αβ T cells to shape the developing repertoire of NAbs. Intriguingly, ligand specificities of NAbs and γδ T cell receptors appear to be overlapping, perhaps allowing γδ cognate help for certain NAb specificities. Via NAbs, γδ T cells could exert a regulatory influence on numerous processes in health and disease.
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Affiliation(s)
- Willi K Born
- Department of Biomedical Research, National Jewish Health, 1400 Jackson Str., Denver, CO, 80206, USA.
- Department of Immunology and Microbiology, University of Colorado Health Sciences Center, Aurora, CO, USA.
| | - Yafei Huang
- Joint Laboratory for Stem Cell Engineering and Technology Transfer, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, People's Republic of China
| | - Wanjiang Zeng
- Department of Obstetrics and Gynecology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430030, China
| | - Raul M Torres
- Department of Immunology and Microbiology, University of Colorado Health Sciences Center, Aurora, CO, USA
| | - Rebecca L O'Brien
- Department of Biomedical Research, National Jewish Health, 1400 Jackson Str., Denver, CO, 80206, USA
- Department of Immunology and Microbiology, University of Colorado Health Sciences Center, Aurora, CO, USA
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9
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Herklotz M, Hanke J, Hänsel S, Drichel J, Marx M, Maitz MF, Werner C. Biomaterials trigger endothelial cell activation when co-incubated with human whole blood. Biomaterials 2016; 104:258-68. [PMID: 27472163 DOI: 10.1016/j.biomaterials.2016.07.022] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Revised: 07/11/2016] [Accepted: 07/16/2016] [Indexed: 12/25/2022]
Abstract
Endothelial cell activation resulting from biomaterial contact or biomaterial-induced blood activation may in turn also affect hemostasis and inflammatory processes in the blood. Current in vitro hemocompatibility assays typically ignore these modulating effects of the endothelium. This study describes a co-incubation system of human whole blood, biomaterial and endothelial cells (ECs) that was developed to overcome this limitation. First, human endothelial cells were characterized in terms of their expression of coagulation- and inflammation-relevant markers in response to various activators. Subsequently, their capacity to regulate hemostasis as well as complement and granulocyte activation was monitored in a hemocompatibility assay. After blood contact, quiescent ECs exhibited anticoagulant and anti-inflammatory properties. When they were co-incubated with surfaces exhibiting pro-coagulant or pro-inflammatory characteristics, the ECs down-regulated coagulation but not complement or leukocyte activation. Analysis of intracellular levels of the endothelial activation markers E-selectin and tissue factor showed that co-incubation with model surfaces and blood significantly increased the activation state of ECs. Finally, the coagulation- and inflammation-modulating properties of the ECs were tested after blood/biomaterial exposure. Pre-activation of ECs by biomaterials in the blood induced a pro-coagulant and pro-inflammatory state of the ECs, wherein the pro-coagulant response was higher for biomaterial/blood pre-activated ECs than for TNF-α-pre-activated cells. This work provides evidence that biomaterials, even without directly contacting the endothelium, affect the endothelial activation state with and have consequences for plasmatic and cellular reactions in the blood.
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Affiliation(s)
- Manuela Herklotz
- Leibniz Institute of Polymer Research Dresden, Max Bergmann Center of Biomaterials Dresden, Germany
| | - Jasmin Hanke
- Leibniz Institute of Polymer Research Dresden, Max Bergmann Center of Biomaterials Dresden, Germany
| | - Stefanie Hänsel
- Leibniz Institute of Polymer Research Dresden, Max Bergmann Center of Biomaterials Dresden, Germany
| | - Juliane Drichel
- Leibniz Institute of Polymer Research Dresden, Max Bergmann Center of Biomaterials Dresden, Germany
| | - Monique Marx
- Leibniz Institute of Polymer Research Dresden, Max Bergmann Center of Biomaterials Dresden, Germany
| | - Manfred F Maitz
- Leibniz Institute of Polymer Research Dresden, Max Bergmann Center of Biomaterials Dresden, Germany.
| | - Carsten Werner
- Leibniz Institute of Polymer Research Dresden, Max Bergmann Center of Biomaterials Dresden, Germany
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10
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Francipane MG, Lagasse E. Towards Organs on Demand: Breakthroughs and Challenges in Models of Organogenesis. CURRENT PATHOBIOLOGY REPORTS 2016; 4:77-85. [PMID: 28979828 DOI: 10.1007/s40139-016-0111-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
In recent years, functional three-dimensional (3D) tissue generation in vitro has been significantly advanced by tissue-engineering methods, achieving better reproduction of complex native organs compared to conventional culture systems. This review will discuss traditional 3D cell culture techniques as well as newly developed technology platforms. These recent techniques provide new possibilities in the creation of human body parts and provide more accurate predictions of tissue response to drug and chemical challenges. Given the rapid advancement in the human induced pluripotent stem cell (iPSC) field, these platforms also hold great promise in the development of patient-specific, transplantable tissues and organs on demand.
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Affiliation(s)
- Maria Giovanna Francipane
- McGowan Institute for Regenerative Medicine, Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA
- Ri.MED Foundation, 90133 Palermo, Italy
| | - Eric Lagasse
- McGowan Institute for Regenerative Medicine, Department of Pathology, University of Pittsburgh School of Medicine, Pittsburgh, PA 15219, USA
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Abdolghafoorian H, Farnia P, Sajadi Nia RS, Bahrami A, Dorudinia A, Ghanavi J. Effect of Heart Valve Decellularization on Xenograft Rejection. EXP CLIN TRANSPLANT 2016; 15:329-336. [PMID: 27210227 DOI: 10.6002/ect.2015.0321] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
OBJECTIVES Endothelial cells harbor many antigenic determinants that may be targets for the immune system. The aim of this study was to determine the immunologic effects of decellularization, using 3 different methods, on xenograft rejection. MATERIALS AND METHODS In a sterile plate containing phosphate-buffered saline, fresh sheep aortic heart valves were decellularized using 3 different enzymatic methods: with 900 μg/mL of collagenase at 40°C (method A), with 450 μg/mL of collagenase at 4°C (method B), and with 900 μg/mL of collagenase at 4°C (method C). Intact and decellularized valves were implanted subdermally into inbred male albino rabbits and extracted after 21 days (extra valve pieces were also extracted after 60 days, as control samples, for assessing chronic rejection). Valves were histologically analyzed for inflammatory cell infiltration. Subendothelial structure integrity was determined using surface electron microscope. RESULTS No inflammatory cell infiltration was seen around the decellularized valve with method A, and no subendothelial structure change was observed by surface electron microscope. Infiltration of immune cells involved in rejection was not seen around valves decellularized with method B, although the subendothelial structure was relatively preserved and valve stiffness was increased. With method C, we observed a foreign body-type reaction around the intact valve and the decellularized valve. CONCLUSIONS Method A is considered the optimal method of decellularization in our study, as this method significantly reduced the immune response to xenograft tissue, while maintaining subendothelial tissue.
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Affiliation(s)
- Hamed Abdolghafoorian
- From the Shahid Beheshti University of Medical Sciences, Tehran, Iran and the Experimental Medicine and Tissue Engineering Center at Masih Daneshvari Hospital, Tehran, Iran
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Martin BM, Samy KP, Lowe MC, Thompson PW, Cano J, Farris AB, Song M, Dove CR, Leopardi FV, Strobert EA, Jenkins JB, Collins BH, Larsen CP, Kirk AD. Dual islet transplantation modeling of the instant blood-mediated inflammatory reaction. Am J Transplant 2015; 15:1241-52. [PMID: 25702898 PMCID: PMC4631614 DOI: 10.1111/ajt.13098] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2014] [Accepted: 11/10/2014] [Indexed: 01/25/2023]
Abstract
Islet xenotransplantation is a potential treatment for diabetes without the limitations of tissue availability. Although successful experimentally, early islet loss remains substantial and attributed to an instant blood-mediated inflammatory reaction (IBMIR). This syndrome of islet destruction has been incompletely defined and characterization in pig-to-primate models has been hampered by logistical and statistical limitations of large animal studies. To further investigate IBMIR, we developed a novel in vivo dual islet transplant model to precisely characterize IBMIR as proof-of-concept that this model can serve to properly control experiments comparing modified xenoislet preparations. WT and α1,3-galactosyltransferase knockout (GTKO) neonatal porcine islets were studied in nonimmunosuppressed rhesus macaques. Inert polyethylene microspheres served as a control for the effects of portal embolization. Digital analysis of immunohistochemistry targeting IBMIR mediators was performed at 1 and 24 h after intraportal islet infusion. Early findings observed in transplanted islets include complement and antibody deposition, and infiltration by neutrophils, macrophages and platelets. Insulin, complement, antibody, neutrophils, macrophages and platelets were similar between GTKO and WT islets, with increasing macrophage infiltration at 24 h in both phenotypes. This model provides an objective and internally controlled study of distinct islet preparations and documents the temporal histology of IBMIR.
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Affiliation(s)
- BM Martin
- Emory Transplant Center, Emory University School of Medicine, Atlanta, GA 30322
| | - KP Samy
- Department of Surgery, Duke University School of Medicine, Durham, NC 27710
| | - MC Lowe
- Emory Transplant Center, Emory University School of Medicine, Atlanta, GA 30322
| | - PW Thompson
- Emory Transplant Center, Emory University School of Medicine, Atlanta, GA 30322
| | - J Cano
- Emory Transplant Center, Emory University School of Medicine, Atlanta, GA 30322
| | - AB Farris
- Department of Pathology & Laboratory Medicine, Emory University School of Medicine, Atlanta, GA 30322
| | - M Song
- Emory Transplant Center, Emory University School of Medicine, Atlanta, GA 30322
| | - CR Dove
- Department of Animal and Dairy Science, College of Agricultural and Environmental Sciences, University of Georgia, Athens, GA 30602
| | - FV Leopardi
- Emory Transplant Center, Emory University School of Medicine, Atlanta, GA 30322
| | - EA Strobert
- Yerkes National Primate Research Center, Atlanta, GA 30329
| | - JB Jenkins
- Yerkes National Primate Research Center, Atlanta, GA 30329
| | - BH Collins
- Department of Surgery, Duke University School of Medicine, Durham, NC 27710
| | - CP Larsen
- Emory Transplant Center, Emory University School of Medicine, Atlanta, GA 30322
| | - AD Kirk
- Emory Transplant Center, Emory University School of Medicine, Atlanta, GA 30322,Department of Surgery, Duke University School of Medicine, Durham, NC 27710
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Choi HJ, Lee JJ, Kim DH, Kim MK, Lee HJ, Ko AY, Kang HJ, Park C, Wee WR. Blockade of CD40-CD154 costimulatory pathway promotes long-term survival of full-thickness porcine corneal grafts in nonhuman primates: clinically applicable xenocorneal transplantation. Am J Transplant 2015; 15:628-41. [PMID: 25676390 DOI: 10.1111/ajt.13057] [Citation(s) in RCA: 56] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Revised: 10/10/2014] [Accepted: 10/11/2014] [Indexed: 01/25/2023]
Abstract
The porcine cornea may be a good solution for the shortage of human donor corneas because its size and refractive properties are comparable to those of the human cornea. However, antigenic differences need to be overcome to apply xenocorneal transplantation in actual clinical practice. We aimed to investigate the feasibility of full-thickness porcine corneas as human corneal substitutes using a CD40-CD154 costimulatory pathway blocking strategy in a clinically applicable pig-to-nonhuman primate corneal transplantation model. As a result, the mean survival time of the xenocorneal grafts in recipients who received anti-CD154 antibody-based immunosuppressants (POD318 (n = 4); >933, >243, 318 and >192) was significantly longer than that in controls (POD28 (n = 3); 21, 28 and 29; p = 0.010, log-rank test). Administration of anti-CD154 antibodies markedly reduced inflammatory cellular infiltrations (predominantly CD8 T cells and macrophages) into the xenocorneal grafts and almost completely blocked xenoantigen-triggered increases in Th1-associated cytokines, chemokines and C3a in the aqueous humor. Moreover, systemic expansion of memory T cells was effectively controlled and responses of anti-Gal/donor pig-specific antibodies were considerably diminished by programmed injection of anti-CD154 antibodies. Consequently, porcine corneas might be promising human corneal substitutes when the transplantation is accompanied by potent immunosuppression such as a CD40-CD154 costimulatory pathway blockade.
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Affiliation(s)
- H J Choi
- Department of Ophthalmology, Seoul National University Hospital Healthcare System Gangnam Center, Seoul, Republic of Korea; Department of Ophthalmology, Seoul National University College of Medicine, Seoul, Republic of Korea; Laboratory of Ocular Regenerative Medicine and Immunology, Seoul Artificial Eye Center, Seoul National University Hospital Biomedical Research Institute, Seoul, Republic of Korea; Translational Xenotransplantation Research Center, Seoul National University College of Medicine and Seoul National University Hospital Biomedical Research Institute, Seoul, Republic of Korea
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Harris DG, Quinn KJ, Dahi S, Burdorf L, Azimzadeh AM, Pierson RN. Lung xenotransplantation: recent progress and current status. Xenotransplantation 2014; 21:496-506. [PMID: 25040467 DOI: 10.1111/xen.12116] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2014] [Accepted: 05/05/2014] [Indexed: 12/22/2022]
Abstract
Xenotransplantation has undergone important progress in controlling initial hyperacute rejection in many preclinical models, with some cell, tissue, and organ xenografts advancing toward clinical trials. However, acute injury, driven primarily by innate immune and inflammatory responses, continues to limit results in lung xenograft models. The purpose of this article is to review the current status of lung xenotransplantation--including the seemingly unique challenges posed by this organ-and summarize proven and emerging means of overcoming acute lung xenograft injury.
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Affiliation(s)
- Donald G Harris
- Department of Surgery, University of Maryland School of Medicine, Baltimore, MD, USA; Center for Vascular and Inflammatory Diseases, University of Maryland School of Medicine, Baltimore, MD, USA
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Kim SE, Choi GH, Shim KM, Choi SH, Lee SM, Kang SS. Evaluation of biocompatibility of α-1,3 galactosyltransferase knockout pig bone graft in a rat calvarial defect model. J Biomed Res 2014. [DOI: 10.12729/jbr.2014.15.2.086] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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16
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Meier RPH, Seebach JD, Morel P, Mahou R, Borot S, Giovannoni L, Parnaud G, Montanari E, Bosco D, Wandrey C, Berney T, Bühler LH, Muller YD. Survival of free and encapsulated human and rat islet xenografts transplanted into the mouse bone marrow. PLoS One 2014; 9:e91268. [PMID: 24625569 PMCID: PMC3953382 DOI: 10.1371/journal.pone.0091268] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Accepted: 02/10/2014] [Indexed: 01/19/2023] Open
Abstract
Bone marrow was recently proposed as an alternative and potentially immune-privileged site for pancreatic islet transplantation. The aim of the present study was to assess the survival and rejection mechanisms of free and encapsulated xenogeneic islets transplanted into the medullary cavity of the femur, or under the kidney capsule of streptozotocin-induced diabetic C57BL/6 mice. The median survival of free rat islets transplanted into the bone marrow or under the kidney capsule was 9 and 14 days, respectively, whereas that of free human islets was shorter, 7 days (bone marrow) and 10 days (kidney capsule). Infiltrating CD8+ T cells and redistributed CD4+ T cells, and macrophages were detected around the transplanted islets in bone sections. Recipient mouse splenocytes proliferated in response to donor rat stimulator cells. One month after transplantation under both kidney capsule or into bone marrow, encapsulated rat islets had induced a similar degree of fibrotic reaction and still contained insulin positive cells. In conclusion, we successfully established a small animal model for xenogeneic islet transplantation into the bone marrow. The rejection of xenogeneic islets was associated with local and systemic T cell responses and macrophage recruitment. Although there was no evidence for immune-privilege, the bone marrow may represent a feasible site for encapsulated xenogeneic islet transplantation.
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Affiliation(s)
- Raphael P. H. Meier
- Cell Isolation and Transplantation Center, Department of Surgery, Geneva University Hospitals and University of Geneva, Geneva, Switzerland
| | - Jörg D. Seebach
- Division of Clinical Immunology and Allergology, Department of Internal Medicine, University Hospital and Medical Faculty, Geneva, Switzerland
| | - Philippe Morel
- Cell Isolation and Transplantation Center, Department of Surgery, Geneva University Hospitals and University of Geneva, Geneva, Switzerland
| | - Redouan Mahou
- Institut d’Ingénierie Biologique et Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Sophie Borot
- Cell Isolation and Transplantation Center, Department of Surgery, Geneva University Hospitals and University of Geneva, Geneva, Switzerland
| | - Laurianne Giovannoni
- Cell Isolation and Transplantation Center, Department of Surgery, Geneva University Hospitals and University of Geneva, Geneva, Switzerland
| | - Geraldine Parnaud
- Cell Isolation and Transplantation Center, Department of Surgery, Geneva University Hospitals and University of Geneva, Geneva, Switzerland
| | - Elisa Montanari
- Cell Isolation and Transplantation Center, Department of Surgery, Geneva University Hospitals and University of Geneva, Geneva, Switzerland
| | - Domenico Bosco
- Cell Isolation and Transplantation Center, Department of Surgery, Geneva University Hospitals and University of Geneva, Geneva, Switzerland
| | - Christine Wandrey
- Institut d’Ingénierie Biologique et Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
| | - Thierry Berney
- Cell Isolation and Transplantation Center, Department of Surgery, Geneva University Hospitals and University of Geneva, Geneva, Switzerland
| | - Leo H. Bühler
- Cell Isolation and Transplantation Center, Department of Surgery, Geneva University Hospitals and University of Geneva, Geneva, Switzerland
| | - Yannick D. Muller
- Cell Isolation and Transplantation Center, Department of Surgery, Geneva University Hospitals and University of Geneva, Geneva, Switzerland
- Division of Clinical Immunology and Allergology, Department of Internal Medicine, University Hospital and Medical Faculty, Geneva, Switzerland
- * E-mail:
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17
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Kalscheuer H, Onoe T, Dahmani A, Li HW, Hölzl M, Yamada K, Sykes M. Xenograft tolerance and immune function of human T cells developing in pig thymus xenografts. THE JOURNAL OF IMMUNOLOGY 2014; 192:3442-50. [PMID: 24591363 DOI: 10.4049/jimmunol.1302886] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Transplantation of xenogeneic thymus tissue allows xenograft tolerance induction in the highly disparate pig-to-mouse model. Fetal swine thymus (SW THY) can support the generation of a diverse human T cell repertoire that is tolerant of the pig in vitro. We demonstrate that SW THY generates all human T cell subsets, including regulatory T cells (Tregs), in similar numbers as fetal human thymus (HU THY) grafts in immunodeficient mice receiving the same human CD34(+) cells. Peripheral T cells are specifically tolerant to the mouse and to the human and porcine donors, with robust responses to nondonor human and pig Ags. Specific tolerance is observed to pig skin grafts sharing the THY donor MHC. SW THY-generated peripheral Tregs show similar function, but include lower percentages of naive-type Tregs compared with HU THY-generated Tregs. Tregs contribute to donor-pig specific tolerance. Peripheral human T cells generated in SW THY exhibit reduced proportions of CD8(+) T cells and reduced lymphopenia-driven proliferation and memory-type conversion, accelerated decay of memory-type cells, and reduced responses to protein Ags. Thus, SW thymus transplantation is a powerful xenotolerance approach for human T cells. However, immune function may be further enhanced by strategies to permit positive selection by autologous HLA molecules.
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Affiliation(s)
- Hannes Kalscheuer
- Transplantation Biology Research Center, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA 02114
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18
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Cowan PJ, Cooper DKC, d'Apice AJF. Kidney xenotransplantation. Kidney Int 2014; 85:265-75. [PMID: 24088952 PMCID: PMC3946635 DOI: 10.1038/ki.2013.381] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2013] [Revised: 07/12/2013] [Accepted: 07/17/2013] [Indexed: 12/14/2022]
Abstract
Xenotransplantation using pigs as donors offers the possibility of eliminating the chronic shortage of donor kidneys, but there are several obstacles to be overcome before this goal can be achieved. Preclinical studies have shown that, while porcine renal xenografts are broadly compatible physiologically, they provoke a complex rejection process involving preformed and elicited antibodies, heightened innate immune cell reactivity, dysregulated coagulation, and a strong T cell-mediated adaptive response. Furthermore, the susceptibility of the xenograft to proinflammatory and procoagulant stimuli is probably increased by cross-species molecular defects in regulatory pathways. To balance these disadvantages, xenotransplantation has at its disposal a unique tool to address particular rejection mechanisms and incompatibilities: genetic modification of the donor. This review focuses on the pathophysiology of porcine renal xenograft rejection, and on the significant genetic, pharmacological, and technical progress that has been made to prolong xenograft survival.
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Affiliation(s)
- Peter J Cowan
- 1] Immunology Research Centre, St Vincent's Hospital, Melbourne, Victoria, Australia [2] Department of Medicine, University of Melbourne, Melbourne, Victoria, Australia
| | - David K C Cooper
- Thomas E. Starzl Transplantation Institute, University of Pittsburgh Medical Center, Pittsburgh, Pennsylvania, USA
| | - Anthony J F d'Apice
- 1] Immunology Research Centre, St Vincent's Hospital, Melbourne, Victoria, Australia [2] Department of Medicine, University of Melbourne, Melbourne, Victoria, Australia
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Autoantibodies targeting neurotransmitter biosynthetic enzymes in attention-deficit/hyperactivity disorder (ADHD). Eur Child Adolesc Psychiatry 2014; 23:115-7. [PMID: 23712861 PMCID: PMC3918119 DOI: 10.1007/s00787-013-0429-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2013] [Accepted: 05/15/2013] [Indexed: 11/07/2022]
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Glycocalyx engineering reveals a Siglec-based mechanism for NK cell immunoevasion. Nat Chem Biol 2013; 10:69-75. [PMID: 24292068 PMCID: PMC3893890 DOI: 10.1038/nchembio.1388] [Citation(s) in RCA: 328] [Impact Index Per Article: 29.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Accepted: 10/01/2013] [Indexed: 12/21/2022]
Abstract
The increase of cell surface sialic acid is a characteristic shared by many tumor types. A correlation between hypersialylation and immunoprotection has been observed, but few hypotheses have provided a mechanistic understanding of this immunosuppressive phenomenon. Here, we show that increasing sialylated glycans on cancer cells inhibits human natural killer (NK) cell activation through the recruitment of sialic acid-binding immunoglobulin-like lectin 7 (Siglec-7). Key to these findings was the use of glycopolymers end-functionalized with phospholipids, which enable the introduction of synthetically defined glycans onto cancer cell surfaces. Remodeling the sialylation status of cancer cells affected the susceptibility to NK cell cytotoxicity via Siglec-7 engagement in a variety of tumor types. These results support a model in which hypersialylation offers a selective advantage to tumor cells under pressure from NK immunosurveillance by increasing Siglec ligands. We also exploited this finding to protect allogeneic and xenogeneic primary cells from NK-mediated killing, suggesting the potential of Siglecs as therapeutic targets in cell transplant therapy.
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21
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Abraham R, Verfaillie CM. Neural differentiation and support of neuroregeneration of non-neural adult stem cells. PROGRESS IN BRAIN RESEARCH 2013. [PMID: 23186708 DOI: 10.1016/b978-0-444-59544-7.00002-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Although it is well established that neural stem cells (NSCs) or neural stem/progenitor cells differentiated from pluripotent stem cells can generate neurons, astrocytes, and oligodendrocytes, a number of other cell populations are also being considered for therapy of central nervous system disorders. Here, we describe the potential of (stem) cells from other postnatal tissues, including bone marrow, (umbilical cord) blood, fat tissue, or dental pulp, which themselves do not (robustly) generate neural progeny. However, these non-neuroectoderm derived cell populations appear to capable of inducing endogenous neurogenesis and angiogenesis. As these "trophic" effects are also, at least partly, responsible for some of the beneficial effects seen when NSC are grafted in the brain, these non-neuroectodermal cells may exert beneficial effects when used to treat neurodegenerative disorders.
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Affiliation(s)
- Rojin Abraham
- Stem Cell Institute, KU Leuven, Onderwijs & Navorsing V, Leuven, Belgium
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Han W, Zhou J, Li X, Wang J, Li J, Zhang Z, Yang Z, Wang D, Tao K, Dou K. RNA interference of GGTA1 physiological and immune functions in immortalized porcine aortic endothelial cells. J Surg Res 2013; 185:410-8. [DOI: 10.1016/j.jss.2013.05.080] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2013] [Revised: 04/27/2013] [Accepted: 05/22/2013] [Indexed: 10/26/2022]
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Abstract
Lung transplantation may be the only intervention that can prolong survival and improve quality of life for those individuals with advanced lung disease who are acceptable candidates for the procedure. However, these candidates may be extremely ill and require ventilator and/or circulatory support as a bridge to transplantation, and lung transplantation recipients are at risk of numerous post-transplant complications that include surgical complications, primary graft dysfunction, acute rejection, opportunistic infection, and chronic lung allograft dysfunction (CLAD), which may be caused by chronic rejection. Many advances in pre- and post-transplant management have led to improved outcomes over the past decade. These include the creation of sound guidelines for candidate selection, improved surgical techniques, advances in donor lung preservation, an improving ability to suppress and treat allograft rejection, the development of prophylaxis protocols to decrease the incidence of opportunistic infection, more effective therapies for treating infectious complications, and the development of novel therapies to treat and manage CLAD. A major obstacle to prolonged survival beyond the early post-operative time period is the development of bronchiolitis obliterans syndrome (BOS), which is the most common form of CLAD. This manuscript discusses recent and evolving advances in the field of lung transplantation.
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Khalpey Z, Yacoub MH, Smolenski RT. Nucleotide metabolic mismatches in mammalian hearts: implications for transplantation. Ann R Coll Surg Engl 2013. [PMID: 23317713 PMCID: PMC3964664 DOI: 10.1308/003588413x13511609955571] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Introduction Human donor organ shortages have led surgeons and scientists to explore the use of animals as alternative organ sources. Acute thrombovascular rejection (AVR) is the main hurdle in xenotransplantation. Disparities in nucleotide metabolism in the vessels of different species may contribute significantly to the microvascular component of AVR. Methods We evaluated the extent of nucleotide metabolism mismatch in selected organs and endothelial cells of different mammals with particular focus on the changes in activity of ecto-5’-nucleotidase (E5’N) elicited by exposure of porcine hearts or endothelial cells to human blood (ex vivo) or human plasma (in vitro). Results E5’N activity in the rat heart was significantly higher than in other species. We noted a significant difference (p<0.001) in E5’N activity between human and pig endothelial cell lines. Initial pig aortic endothelial E5’N activity decreased in vitro after a three-hour exposure to human and porcine plasma while remaining constant in controls. Ex vivo perfusion with fresh human blood for four hours resulted in a significant decrease of E5’N activity in both wild type and transgenic pig hearts overexpressing human decay accelerating factor (p<0.001). Conclusions This study provides evidence that mismatches in basal mammalian metabolic pathways and humoral immunity interact in a xenogeneic environment. Understanding the role of nucleotide metabolism and signalling in xenotransplantation may identify new targets for genetic modifications and may lead to the development of new therapies extending graft survival.
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Affiliation(s)
- Z Khalpey
- Division of Cardiothoracic Surgery, University of Arizona College of Medicine, 1,501 North Campbell Avenue, PO Box 245071, Tucson, AZ 85724-5071, USA.
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Puga Yung GL, Li Y, Borsig L, Millard AL, Karpova MB, Zhou D, Seebach JD. Complete absence of the αGal xenoantigen and isoglobotrihexosylceramide in α1,3galactosyltransferase knock-out pigs. Xenotransplantation 2012; 19:196-206. [PMID: 22702471 DOI: 10.1111/j.1399-3089.2012.00705.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND Anti-Galα1,3Galβ-R natural antibodies are responsible for hyperacute rejection in pig-to-primate xenotransplantation. Although the generation of pigs lacking the α1,3galactosyltransferase (GalT) has overcome hyperacute rejection, antibody-mediated rejection is still a problem. It is possible that other enzymes synthesize antigens similar to Galα1,3Gal epitopes that are recognized by xenoreactive antibodies. The glycosphingolipid isoglobotrihexosylceramide (iGb₃) represents such a candidate expressing an alternative Galα1,3Gal epitope. The present work determined whether the terminal Galα1,3Gal disaccharide is completely absent in Immerge pigs lacking the GalT using several different highly sensitive methods. METHODS The expression of Galα1,3Gal was evaluated using a panel of antibodies and lectins by flow cytometry and fluorescent microscopy; GalT activity was detected by an enzymatic assay; and ion trap mass spectroscopy of neutral cellular membranes extracted from aortic endothelial was used for the detection of sugar structures. Finally, the presence of iGb₃ synthase mRNA was tested by RT-PCR in pig thymus, spleen, lymph node, kidney, lung, and liver tissue samples. RESULTS Aortic endothelial cells derived from GalT knockout pigs expressed neither Galα1,3Gal nor iGb₃ on their surface, and GalT enzymatic activity was also absent. Lectin staining showed an increase in the blood group H-type sugar structures present in GalT knockout cells as compared to wild-type pig aortic endothelial cells (PAEC). Mass spectroscopic analysis did not reveal Galα1,3Gal in membranes of GalT knockout PAEC; iGb₃ was also totally absent, whereas a fucosylated form of iGb₃ was detected at low levels in both pig aortic endothelial cell extracts. Isoglobotrihexosylceramide 3 synthase mRNA was expressed in all pig tissues tested whether derived from wild-type or GalT knockout animals. CONCLUSIONS These results confirm unequivocally the absence of terminal Galα1,3Gal disaccharides in GalT knockout endothelial cells. Future work will have to focus on other mechanisms responsible for xenograft rejection, in particular non-Galα1,3Gal antibodies and cellular responses.
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Affiliation(s)
- Gisella L Puga Yung
- Division of Clinical Immunology and Allergology, Department of Internal Medicine, University Hospital and Medical Faculty Geneva, Geneva, Switzerland
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Kim DJ, Kim YJ, Kim WH, Kim SH. Xenograft Failure of Pulmonary Valved Conduit Cross-linked with Glutaraldehyde or Not Cross-linked in a Pig to Goat Implantation Model. THE KOREAN JOURNAL OF THORACIC AND CARDIOVASCULAR SURGERY 2012; 45:287-94. [PMID: 23130301 PMCID: PMC3487011 DOI: 10.5090/kjtcs.2012.45.5.287] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/23/2011] [Revised: 03/14/2012] [Accepted: 04/04/2012] [Indexed: 11/18/2022]
Abstract
Background Biologic valved grafts are important in cardiac surgery, and although several types of graft are currently available, most commercial xenografts tend to cause early disfiguration due to intimal proliferation and calcification. We studied the graft failure patterns on non-fixed and glutaraldehyde-fixed pulmonary xenograft in vivo animal experiment. Materials and Methods Pulmonary valved conduits were obtained from the right ventricular outflow tract of eleven miniature pigs. The grafts were subjected to 2 different preservation methods; with or without glutaraldehyde fixation: glutaraldehyde fixation (n=7) and non-glutaraldehyde fixation (n=4). The processed explanted pulmonary valved grafts of miniature pig were then transplanted into eleven goats. Calcium quantization was achieved in all of the explanted xenograft, hemodynamic, histopathologic and radiologic evaluations were performed in the graft which the transplantation period was over 300 days (n=7). Results Grafts treated with glutaraldehyde fixation had more calcification and conduit obstruction in mid-term period. Calcium deposition also appeared much higher in the glutaraldehyde treated graft compared to the non-glutaraldehyde treated graft (p<0.05). Conclusion The present study suggests that xenografts prepared using glutaraldehyde fixation alone appeared to have severe calcification compared to the findings of non-glutaraldehyde treated xenografts and to be managed with proper anticalcification treatment and novel preservation methods. This experiment gives the useful basic chemical, histologic data of xenograft failure model with calcification for further animal study.
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Affiliation(s)
- Dong Jin Kim
- Department of Thoracic and Cardiovascular Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Korea
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Abstract
Cellular studies are essential in the xenotransplantation field in order to investigate the cellular immune responses triggered by xenogeneic cells and identify the key molecules involved. A series of functional studies can be conducted with this purpose that include treatment with proinflammatory cytokines and xenogeneic cell-based assays that put together pig cells and human leukocytes such as monocytes, NK cells, and T cells. The choice of the pig cell type is critical to appropriately model the transplant setting of interest. Thus, pig endothelial cells are commonly used for studying the rejection process of vascularized organs. Treatment with cytokines allows studying the regulation of adhesion, costimulatory molecules, and receptors involved in triggering the immune response in an attempt to reproduce the more complex in vivo situation. The adhesion assays are used to determine the capacity of human leukocytes to adhere to porcine cells under various conditions. Furthermore, we describe coculture, costimulatory, and cytotoxicity assays for investigating the cellular and molecular mechanisms that take place during the xenogeneic immune response.
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Sommaggio R, Cohnen A, Watzl C, Costa C. Multiple receptors trigger human NK cell-mediated cytotoxicity against porcine chondrocytes. THE JOURNAL OF IMMUNOLOGY 2012; 188:2075-83. [PMID: 22287712 DOI: 10.4049/jimmunol.1100433] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Xenotransplantation of genetically engineered porcine chondrocytes may provide a therapeutic solution for the repair of cartilage defects of various types. However, the mechanisms underlying the humoral and cellular responses that lead to rejection of xenogeneic cartilage are not well understood. In this study, we investigated the interaction between human NK cells and isolated porcine costal chondrocytes (PCC). Our data show that freshly isolated NK cells adhere weakly to PCC. Consequently, PCC were highly resistant to cytolysis mediated by freshly isolated NK cells. However, the presence of human natural Abs in the coculture was often sufficient to trigger cytotoxicity against PCC. Furthermore, IL-2 stimulation of NK cells or activation of PCC with the proinflammatory cytokines TNF-α or IL-1α resulted in increased adhesion, which was paralleled by increased NK cell-mediated lysis of PCC. NK cell adhesion to PCC could be blocked by Abs against human LFA-1 and porcine VCAM-1. NKG2D and NKp44 were involved in triggering cytotoxicity against PCC, which expressed ligands for these activating NK cell receptors. Our data further suggest that NKp30 and NKp46 may contribute to the activation of NK cells by PCC under certain conditions. Finally, comparative studies confirmed that PCC are more resistant than porcine aortic endothelial cells to human NK cell-mediated lysis. Thus, the data demonstrate that human NK cells can kill pig chondrocytes and may therefore contribute to rejection of xenogeneic cartilage. In addition, we identify potential targets for intervention to prevent the NK cell response against pig xenografts.
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Affiliation(s)
- Roberta Sommaggio
- New Therapies of Genes and Transplants Group, Bellvitge Biomedical Research Institute, L'Hospitalet de Llobregat, Barcelona 08908, Spain
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Anderson AJ, Haus DL, Hooshmand MJ, Perez H, Sontag CJ, Cummings BJ. Achieving stable human stem cell engraftment and survival in the CNS: is the future of regenerative medicine immunodeficient? Regen Med 2011; 6:367-406. [PMID: 21548741 DOI: 10.2217/rme.11.22] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
There is potential for a variety of stem cell populations to mediate repair in the diseased or injured CNS; in some cases, this theoretical possibility has already transitioned to clinical safety testing. However, careful consideration of preclinical animal models is essential to provide an appropriate assessment of stem cell safety and efficacy, as well as the basic biological mechanisms of stem cell action. This article examines the lessons learned from early tissue, organ and hematopoietic grafting, the early assumptions of the stem cell and CNS fields with regard to immunoprivilege, and the history of success in stem cell transplantation into the CNS. Finally, we discuss strategies in the selection of animal models to maximize the predictive validity of preclinical safety and efficacy studies.
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Affiliation(s)
- Aileen J Anderson
- Sue & Bill Gross Stem Cell Center, 845 Health Science Road, UC Irvine, Irvine, CA 92697-1705, USA.
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de la Garza-Rodea AS, Verweij MC, Boersma H, van der Velde-van Dijke I, de Vries AAF, Hoeben RC, van Bekkum DW, Wiertz EJHJ, Knaän-Shanzer S. Exploitation of herpesvirus immune evasion strategies to modify the immunogenicity of human mesenchymal stem cell transplants. PLoS One 2011; 6:e14493. [PMID: 21253016 PMCID: PMC3017051 DOI: 10.1371/journal.pone.0014493] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2010] [Accepted: 12/06/2010] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND Mesenchymal stem cells (MSCs) are multipotent cells residing in the connective tissue of many organs and holding great potential for tissue repair. In culture, human MSCs (hMSCs) are capable of extensive proliferation without showing chromosomal aberrations. Large numbers of hMSCs can thus be acquired from small samples of easily obtainable tissues like fat and bone marrow. MSCs can contribute to regeneration indirectly by secretion of cytokines or directly by differentiation into specialized cell types. The latter mechanism requires their long-term acceptance by the recipient. Although MSCs do not elicit immune responses in vitro, animal studies have revealed that allogeneic and xenogeneic MSCs are rejected. METHODOLOGY/PRINCIPAL FINDINGS We aim to overcome MSC immune rejection through permanent down-regulation of major histocompatibility complex (MHC) class I proteins on the surface of these MHC class II-negative cells through the use of viral immune evasion proteins. Transduction of hMSCs with a retroviral vector encoding the human cytomegalovirus US11 protein resulted in strong inhibition of MHC class I surface expression. When transplanted into immunocompetent mice, persistence of the US11-expressing and HLA-ABC-negative hMSCs at levels resembling those found in immunodeficient (i.e., NOD/SCID) mice could be attained provided that recipients' natural killer (NK) cells were depleted prior to cell transplantation. CONCLUSIONS/SIGNIFICANCE Our findings demonstrate the potential utility of herpesviral immunoevasins to prevent rejection of xenogeneic MSCs. The observation that down-regulation of MHC class I surface expression renders hMSCs vulnerable to NK cell recognition and cytolysis implies that multiple viral immune evasion proteins are likely required to make hMSCs non-immunogenic and thereby universally transplantable.
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Affiliation(s)
| | - Marieke C. Verweij
- Department of Medical Microbiology, Leiden University Medical Center, Leiden, The Netherlands
| | - Hester Boersma
- Department of Molecular Cell Biology, Leiden University Medical Center, Leiden, The Netherlands
| | | | - Antoine A. F. de Vries
- Department of Molecular Cell Biology, Leiden University Medical Center, Leiden, The Netherlands
| | - Rob C. Hoeben
- Department of Molecular Cell Biology, Leiden University Medical Center, Leiden, The Netherlands
| | - Dirk W. van Bekkum
- Department of Molecular Cell Biology, Leiden University Medical Center, Leiden, The Netherlands
| | - Emmanuel J. H. J. Wiertz
- Department of Medical Microbiology, Leiden University Medical Center, Leiden, The Netherlands
- Department of Medical Microbiology, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Shoshan Knaän-Shanzer
- Department of Molecular Cell Biology, Leiden University Medical Center, Leiden, The Netherlands
- * E-mail:
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Gock H, Nottle M, Lew AM, d'Apice AJ, Cowan P. Genetic modification of pigs for solid organ xenotransplantation. Transplant Rev (Orlando) 2011; 25:9-20. [DOI: 10.1016/j.trre.2010.10.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2010] [Revised: 08/13/2010] [Accepted: 10/01/2010] [Indexed: 10/18/2022]
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Oh JY, Kim MK, Lee HJ, Ko JH, Kim Y, Park CS, Kang HJ, Park CG, Kim SJ, Lee JH, Wee WR. Complement depletion with cobra venom factor delays acute cell-mediated rejection in pig-to-mouse corneal xenotransplantation. Xenotransplantation 2010; 17:140-6. [PMID: 20522246 DOI: 10.1111/j.1399-3089.2010.00574.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND We have demonstrated earlier that porcine corneal xenografts underwent an acute cell-mediated rejection in mice despite the absence of T cells. In the present study, we investigated the effect of complement depletion by cobra venom factor (CVF) on the corneal xenograft rejection in a pig-to-mouse model. METHODS Porcine corneas were orthotopically transplanted into C57BL/6 (B6) and severe combined immunodeficiency (SCID) mice. For complement depletion, 25 microg of CVF (1 g/kg bodyweight) was injected intraperitoneally on the day before and 1, 3, 5, and 7 days after transplantation. Graft survival was clinically assessed by slit lamp biomicroscopy and the median survival time (MST) was calculated. The grafts were histologically evaluated serially after transplantation using antibodies against CD4, CD8, NK1.1, and F4/80. RESULTS The CVF treatment significantly prolonged the porcine corneal xenograft survival in both B6 (MST 9.4 vs. 15.5 days; P = 0.0011) and SCID mice (MST 16.4 vs. 20.5 days; P = 0.0474). Histologically, whereas macrophages and CD4(+) T cells were progressively infiltrated into porcine corneal grafts in CVF-untreated B6 mice, the infiltration by both cells was markedly delayed and decreased in the xenografts in CVF-treated B6 mice. Likewise, macrophage infiltration, which was prominent in rejected porcine xenografts in SCID mice, was also reduced in CVF-treated SCID mice. CONCLUSIONS Our results suggest that complement depletion by CVF delayed, although did not prevent, an acute cell-mediated rejection in a pig-to-mouse corneal xenotransplantation.
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Affiliation(s)
- Joo Youn Oh
- Seoul Artificial Eye Center, Seoul National University Hospital Clinical Research Institute, Seoul National University College of Medicine, Seoul, Korea
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Current world literature. Curr Opin Organ Transplant 2010; 15:254-61. [PMID: 20351662 DOI: 10.1097/mot.0b013e328337a8db] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Schneider MKJ, Seebach JD. Xenotransplantation literature update: May-October, 2009. Xenotransplantation 2010; 16:555-62. [PMID: 20042055 DOI: 10.1111/j.1399-3089.2009.00561.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Pierson RN, Dorling A, Ayares D, Rees MA, Seebach JD, Fishman JA, Hering BJ, Cooper DKC. Current status of xenotransplantation and prospects for clinical application. Xenotransplantation 2009; 16:263-80. [PMID: 19796067 PMCID: PMC2866107 DOI: 10.1111/j.1399-3089.2009.00534.x] [Citation(s) in RCA: 100] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Xenotransplantation is one promising approach to bridge the gap between available human cells, tissues, and organs and the needs of patients with diabetes or end-stage organ failure. Based on recent progress using genetically modified source pigs, improving results with conventional and experimental immunosuppression, and expanded understanding of residual physiologic hurdles, xenotransplantation appears likely to be evaluated in clinical trials in the near future for some select applications. This review offers a comprehensive overview of known mechanisms of xenograft injury, a contemporary assessment of preclinical progress and residual barriers, and our opinions regarding where breakthroughs are likely to occur.
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Affiliation(s)
- Richard N Pierson
- Division of Cardiac Surgery, Department of Surgery, University of Maryland, Baltimore VAMC, Baltimore, MD 21201, USA.
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Abstract
In recent years the development of novel immunosuppressive strategies and new lines of engineered pigs have enabled improved xenograft survival in the clinically-relevant pig-to-primate models (especially in islet xenotransplantation). Furthermore, researchers have now developed appropriate biomolecular tools to address rapidly the remaining barriers and render organs from source pigs more "compatible" with man. Efficacy has been the main focus of the research conducted in the last few years. However, other fundamental issues, such as those regarding the physiology, the safety, the ethics and regulatory aspects of xenotransplantation, will need to be addressed satisfactorily prior to proceeding with clinical xenotransplantation trials.
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