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Abstract
Solid organ transplantation is a life-saving treatment for people with end-stage organ disease. Immune-mediated transplant rejection is a common complication that decreases allograft survival. Although immunosuppression is required to prevent rejection, it also increases the risk of infection. Some infections, such as cytomegalovirus and BK virus, can promote inflammatory gene expression that can further tip the balance toward rejection. BK virus and other infections can induce damage that resembles the clinical pathology of rejection, and this complicates accurate diagnosis. Moreover, T cells specific for viral infection can lead to rejection through heterologous immunity to donor antigen directly mediated by antiviral cells. Thus, viral infections and allograft rejection interact in multiple ways that are important to maintain immunologic homeostasis in solid organ transplant recipients. Better insight into this dynamic interplay will help promote long-term transplant survival.
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Affiliation(s)
- Lauren E Higdon
- Department of Medicine/Nephrology, Stanford University, Palo Alto, CA
| | - Jane C Tan
- Department of Medicine/Nephrology, Stanford University, Palo Alto, CA
| | - Jonathan S Maltzman
- Department of Medicine/Nephrology, Stanford University, Palo Alto, CA
- Geriatric Research Education and Clinical Center, VA Palo Alto Health Care System, Palo Alto, CA
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2
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Farshbafnadi M, Razi S, Rezaei N. Transplantation. Clin Immunol 2023. [DOI: 10.1016/b978-0-12-818006-8.00008-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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3
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The Molecular Microscope Diagnostic System: Assessment of Rejection and Injury in Heart Transplant Biopsies. Transplantation 2023; 107:27-44. [PMID: 36508644 DOI: 10.1097/tp.0000000000004323] [Citation(s) in RCA: 18] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
This review describes the development of the Molecular Microscope Diagnostic System (MMDx) for heart transplant endomyocardial biopsies (EMBs). MMDx-Heart uses microarrays to measure biopsy-based gene expression and ensembles of machine learning algorithms to interpret the results and compare each new biopsy to a large reference set of earlier biopsies. MMDx assesses T cell-mediated rejection (TCMR), antibody-mediated rejection (AMR), recent parenchymal injury, and atrophy-fibrosis, continually "learning" from new biopsies. Rejection-associated transcripts mapped in kidney transplants and experimental systems were used to identify TCMR, AMR, and recent injury-induced inflammation. Rejection and injury emerged as gradients of intensity, rather than binary classes. AMR was one-third donor-specific antibody (DSA)-negative, and many EMBs first considered to have no rejection displayed minor AMR-like changes, with increased probability of DSA positivity and subtle inflammation. Rejection-associated transcript-based algorithms now classify EMBs as "Normal," "Minor AMR changes," "AMR," "possible AMR," "TCMR," "possible TCMR," and "recent injury." Additionally, MMDx uses injury-associated transcript sets to assess the degree of parenchymal injury and atrophy-fibrosis in every biopsy and study the effect of rejection on the parenchyma. TCMR directly injures the parenchyma whereas AMR usually induces microcirculation stress but relatively little initial parenchymal damage, although slowly inducing parenchymal atrophy-fibrosis. Function (left ventricular ejection fraction) and short-term risk of failure are strongly determined by parenchymal injury. These discoveries can guide molecular diagnostic applications, either as a central MMDx system or adapted to other platforms. MMDx can also help calibrate noninvasive blood-based biomarkers to avoid unnecessary biopsies and monitor response to therapy.
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4
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Halloran PF, Einecke G, Sikosana MLN, Madill-Thomsen K. The Biology and Molecular Basis of Organ Transplant Rejection. Handb Exp Pharmacol 2022; 272:1-26. [PMID: 35091823 DOI: 10.1007/164_2021_557] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Allograft rejection is defined as tissue injury in a transplanted allogeneic organ produced by the effector mechanisms of the adaptive alloimmune response. Effector T lymphocytes and IgG alloantibodies cause two different types of rejection that can occur either individually or simultaneously: T cell-mediated rejection (TCMR) and antibody-mediated rejection (ABMR). In TCMR, cognate effector T cells infiltrate the graft and orchestrate an interstitial inflammatory response in the kidney interstitium in which effector T cells engage antigen-presenting myeloid cells, activating the T cells, antigen-presenting cells, and macrophages. The result is intense expression of IFNG and IFNG-induced molecules, expression of effector T cell molecules and macrophage molecules and checkpoints, and deterioration of parenchymal function. The diagnostic lesions of TCMR follow, i.e. interstitial inflammation, parenchymal deterioration, and intimal arteritis. In ABMR, HLA IgG alloantibodies produced by plasma cells bind to the donor antigens on graft microcirculation, leading to complement activation, margination, and activation of NK cells and neutrophils and monocytes, and endothelial injury, sometimes with intimal arteritis. TCMR becomes infrequent after 5-10 years post-transplant, probably reflecting adaptive mechanisms such as checkpoints, but ABMR can present even decades post-transplant. Some rejection is triggered by inadequate immunosuppression and non-adherence, challenging the clinician to target effective immunosuppression even decades post-transplant.
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Affiliation(s)
- Philip F Halloran
- Division of Nephrology, Department of Medicine, University of Alberta, Edmonton, AB, Canada.
| | - Gunilla Einecke
- Department of Nephrology and Hypertension, Hannover Medical School, Hannover, Germany
| | - Majid L N Sikosana
- Division of Nephrology, Department of Medicine, University of Alberta, Edmonton, AB, Canada
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5
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Heterologous Immunity of Virus-Specific T Cells Leading to Alloreactivity: Possible Implications for Solid Organ Transplantation. Viruses 2021; 13:v13122359. [PMID: 34960628 PMCID: PMC8706157 DOI: 10.3390/v13122359] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2021] [Revised: 11/19/2021] [Accepted: 11/22/2021] [Indexed: 12/18/2022] Open
Abstract
Exposure of the adaptive immune system to a pathogen can result in the activation and expansion of T cells capable of recognizing not only the specific antigen but also different unrelated antigens, a process which is commonly referred to as heterologous immunity. While such cross-reactivity is favourable in amplifying protective immune responses to pathogens, induction of T cell-mediated heterologous immune responses to allo-antigens in the setting of solid organ transplantation can potentially lead to allograft rejection. In this review, we provide an overview of murine and human studies investigating the incidence and functional properties of virus-specific memory T cells cross-reacting with allo-antigens and discuss their potential relevance in the context of solid organ transplantation.
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6
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Mangare C, Tischer-Zimmermann S, Bonifacius A, Riese SB, Dragon AC, Blasczyk R, Maecker-Kolhoff B, Eiz-Vesper B. Variances in Antiviral Memory T-Cell Repertoire of CD45RA- and CD62L-Depleted Lymphocyte Products Reflect the Need of Individual T-Cell Selection Strategies to Reduce the Risk of GvHD while Preserving Antiviral Immunity in Adoptive T-Cell Therapy. Transfus Med Hemother 2021; 49:30-43. [DOI: 10.1159/000516284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 04/01/2021] [Indexed: 11/19/2022] Open
Abstract
<b><i>Introduction:</i></b> Viral infections and reactivations still remain a cause of morbidity and mortality after hematopoietic stem cell transplantation due to immunodeficiency and immunosuppression. Transfer of unmanipulated donor-derived lymphocytes (DLI) represents a promising strategy for improving cellular immunity but carries the risk of graft versus host disease (GvHD). Depleting alloreactive naïve T cells (T<sub>N</sub>) from DLIs was implemented to reduce the risk of GvHD induction while preserving antiviral memory T-cell activity. Here, we compared two T<sub>N</sub> depletion strategies via CD45RA and CD62L expression and investigated the presence of antiviral memory T cells against human adenovirus (AdV) and Epstein-Barr virus (EBV) in the depleted fractions in relation to their functional and immunophenotypic characteristics. <b><i>Methods:</i></b> T-cell responses against ppEBV_EBNA1, ppEBV_Consensus and ppAdV_Hexon within T<sub>N</sub>-depleted (CD45RA<sup>−</sup>/CD62L<sup>−</sup>) and T<sub>N</sub>-enriched (CD45RA<sup>+</sup>/CD62L<sup>+</sup>) fractions were quantified by interferon-gamma (IFN-γ) ELISpot assay after short- and long-term <i>in vitro</i> stimulation. T-cell frequencies and immunophenotypic composition were assessed in all fractions by flow cytometry. Moreover, alloimmune T-cell responses were evaluated by mixed lymphocyte reaction. <b><i>Results:</i></b> According to differences in the phenotype composition, antigen-specific T-cell responses in CD45RA<sup>−</sup> fraction were up to 2 times higher than those in the CD62L<sup>−</sup> fraction, with the highest increase (up to 4-fold) observed after 7 days for ppEBV_EBNA1-specific T cells. The CD4<sup>+</sup> effector memory T cells (T<sub>EM</sub>) were mainly responsible for EBV_EBNA1- and AdV_Hexon-specific T-cell responses, whereas the main functionally active T cells against ppEBV_Consensus were CD8<sup>+</sup> central memory T cells (T<sub>CM</sub>) and T<sub>EM</sub>. Moreover, comparison of both depletion strategies indicated that alloreactivity in CD45RA<sup>−</sup> was lower than that in CD62L<sup>−</sup> fraction. <b><i>Conclusion:</i></b> Taken together, our results indicate that CD45RA depletion is a more suitable strategy for generating T<sub>N</sub>-depleted products consisting of memory T cells against ppEBV_EBNA1 and ppAdV_Hexon than CD62L in terms of depletion effectiveness, T-cell functionality and alloreactivity. To maximally exploit the beneficial effects mediated by antiviral memory T cells in T<sub>N</sub>-depleted products, depletion methods should be selected individually according to phenotype composition and CD4/CD8 antigen restriction. T<sub>N</sub>-depleted DLIs may improve the clinical outcome in terms of infections, GvHD, and disease relapse if selection of pathogen-specific donor T cells is not available.
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7
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Abstract
Immunologic memory is the ability of adaptive immune system to quickly and specifically recognize previously encountered antigens and initiate an effector response. Alloreactive memory cells can mount rapid and robust responses to the transplanted organ resulting in allograft injury. Thus preexisting humoral or cellular memory alloresponses are typically associated with poor graft outcomes in experimental and clinical transplantation. While both B and T lymphocytes exhibit memory responses, this review discusses recent updates on the biology of memory T cells and their relevance to the field of transplantation. Three major areas of focus are the emergence and characterization of tissue resident memory T cells, manipulation of T cell metabolic pathways, and the latest promising approaches to targeting detrimental T cell memory in the settings of organ transplantation.
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8
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Karahan GE, Claas FHJ, Heidt S. Pre-existing Alloreactive T and B Cells and Their Possible Relevance for Pre-transplant Risk Estimation in Kidney Transplant Recipients. Front Med (Lausanne) 2020; 7:340. [PMID: 32793610 PMCID: PMC7385137 DOI: 10.3389/fmed.2020.00340] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Accepted: 06/08/2020] [Indexed: 12/25/2022] Open
Abstract
In allogeneic transplantation, genetic disparities between patient and donor may lead to cellular and humoral immune responses mediated by both naïve and memory alloreactive cells of the adaptive immune system. This review will focus on alloreactive T and B cells with emphasis on the memory compartment, their role in relation to kidney rejection, and in vitro assays to detect these alloreactive cells. Finally, the potential additional value of utilizing donor-specific memory T and B cell assays supplementary to current routine pre-transplant risk assessment of kidney transplant recipients will be discussed.
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Affiliation(s)
- Gonca E Karahan
- Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, Leiden, Netherlands
| | - Frans H J Claas
- Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, Leiden, Netherlands
| | - Sebastiaan Heidt
- Department of Immunohematology and Blood Transfusion, Leiden University Medical Center, Leiden, Netherlands
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9
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Hughes AD, Zhao D, Dai H, Abou-Daya KI, Tieu R, Rammal R, Williams AL, Landsittel DP, Shlomchik WD, Morelli AE, Oberbarnscheidt MH, Lakkis FG. Cross-dressed dendritic cells sustain effector T cell responses in islet and kidney allografts. J Clin Invest 2020; 130:287-294. [PMID: 31763998 DOI: 10.1172/jci125773] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2018] [Accepted: 09/25/2019] [Indexed: 01/01/2023] Open
Abstract
Activation of host T cells that mediate allograft rejection is a 2-step process. The first occurs in secondary lymphoid organs where T cells encounter alloantigens presented by host DCs and differentiate to effectors. Antigen presentation at these sites occurs principally via transfer of intact, donor MHC-peptide complexes from graft cells to host DCs (cross-dressing) or by uptake and processing of donor antigens into allopeptides bound to self-MHC molecules (indirect presentation). The second step takes place in the graft, where effector T cells reengage with host DCs before causing rejection. How host DCs present alloantigens to T cells in the graft is not known. Using mouse islet and kidney transplantation models, imaging cytometry, and 2-photon intravital microscopy, we demonstrate extensive cross-dressing of intragraft host DCs with donor MHC-peptide complexes that occurred early after transplantation, whereas host DCs presenting donor antigen via the indirect pathway were rare. Cross-dressed DCs stably engaged TCR-transgenic effector CD8+ T cells that recognized donor antigen and were sufficient for sustaining acute rejection. In the chronic kidney rejection model, cross-dressing declined over time but was still conspicuous 8 weeks after transplantation. We conclude that cross-dressing of host DCs with donor MHC molecules is a major antigen presentation pathway driving effector T cell responses within allografts.
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Affiliation(s)
- Andrew D Hughes
- Thomas E. Starzl Transplantation Institute.,Physician Scientist Training Program, and
| | - Daqiang Zhao
- Thomas E. Starzl Transplantation Institute.,Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA.,Department of Organ Transplantation, Renmin Hospital, Wuhan University, Wuhan, China
| | - Hehua Dai
- Thomas E. Starzl Transplantation Institute.,Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Khodor I Abou-Daya
- Thomas E. Starzl Transplantation Institute.,Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Roger Tieu
- Thomas E. Starzl Transplantation Institute.,Medical Scientist Training Program, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Rayan Rammal
- Division of Anatomic Pathology, Department of Pathology, American University of Beirut, Beirut, Lebanon
| | - Amanda L Williams
- Thomas E. Starzl Transplantation Institute.,Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Douglas P Landsittel
- Thomas E. Starzl Transplantation Institute.,Department of Biomedical Informatics
| | - Warren D Shlomchik
- Thomas E. Starzl Transplantation Institute.,Department of Medicine, and.,Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Adrian E Morelli
- Thomas E. Starzl Transplantation Institute.,Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA.,Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Martin H Oberbarnscheidt
- Thomas E. Starzl Transplantation Institute.,Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA.,Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Fadi G Lakkis
- Thomas E. Starzl Transplantation Institute.,Department of Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA.,Medical Scientist Training Program, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA.,Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
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10
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Podestà MA, Binder C, Sellberg F, DeWolf S, Shonts B, Ho SH, Obradovic A, Waffarn E, Danzl N, Berglund D, Sykes M. Siplizumab selectively depletes effector memory T cells and promotes a relative expansion of alloreactive regulatory T cells in vitro. Am J Transplant 2020; 20:88-100. [PMID: 31319439 PMCID: PMC6940533 DOI: 10.1111/ajt.15533] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2018] [Revised: 07/02/2019] [Accepted: 07/10/2019] [Indexed: 01/25/2023]
Abstract
Siplizumab, a humanized anti-CD2 monoclonal antibody, has been used in conditioning regimens for hematopoietic cell transplantation and tolerance induction with combined kidney-bone marrow transplantation. Siplizumab-based tolerance induction regimens deplete T cells globally while enriching regulatory T cells (Tregs) early posttransplantation. Siplizumab inhibits allogeneic mixed-lymphocyte reactions (MLRs) in vitro. We compared the impact of siplizumab on Tregs versus other T cell subsets in HLA-mismatched allogeneic MLRs using PBMCs. Siplizumab predominantly reduced the percentage of CD4+ and CD8+ effector memory T cells, which express higher CD2 levels than naïve T cells or resting Tregs. Conversely, siplizumab enriched proliferating CD45RA- FoxP3HI cells in MLRs. FoxP3 expression was stable over time in siplizumab-containing cultures, consistent with enrichment for bona fide Tregs. Consistently, high-throughput TCRβ CDR3 sequencing of sorted unstimulated and proliferating T cells in MLRs revealed selective expansion of donor-reactive Tregs along with depletion of donor-reactive CD4+ effector/memory T cells in siplizumab-containing MLRs. These results indicate that siplizumab may have immunomodulatory functions that may contribute to its success in tolerance-inducing regimens. Our studies also confirm that naïve in addition to effector/memory T cells contribute to the allogeneic MLR and mandate further investigation of the impact of siplizumab on alloreactive naïve T cells.
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Affiliation(s)
- Manuel Alfredo Podestà
- Columbia Center for Translational Immunology, Department of Medicine, Columbia University Medical Center, NY, USA.,Current affiliations: Università degli Studi di Milano, Milan, Italy and Istituto di Ricerche Farmacologiche Mario Negri IRCCS, Bergamo, Italy
| | - Christian Binder
- ITB-Med AB, Sonja Kovalevskys gata 4, 113 66 Stockholm, Sweden,Department of Immunology, Genetics and Pathology, Section of Clinical Immunology, Uppsala University, Uppsala, Sweden
| | - Felix Sellberg
- ITB-Med AB, Sonja Kovalevskys gata 4, 113 66 Stockholm, Sweden,Department of Immunology, Genetics and Pathology, Section of Clinical Immunology, Uppsala University, Uppsala, Sweden
| | - Susan DeWolf
- Columbia Center for Translational Immunology, Department of Medicine, Columbia University Medical Center, NY, USA
| | - Brittany Shonts
- Columbia Center for Translational Immunology, Department of Medicine, Columbia University Medical Center, NY, USA
| | - Siu-Hong Ho
- Columbia Center for Translational Immunology, Department of Medicine, Columbia University Medical Center, NY, USA
| | - Aleksandar Obradovic
- Columbia Center for Translational Immunology, Department of Medicine, Columbia University Medical Center, NY, USA
| | - Elizabeth Waffarn
- Columbia Center for Translational Immunology, Department of Medicine, Columbia University Medical Center, NY, USA
| | - Nichole Danzl
- Columbia Center for Translational Immunology, Department of Medicine, Columbia University Medical Center, NY, USA
| | - David Berglund
- ITB-Med AB, Sonja Kovalevskys gata 4, 113 66 Stockholm, Sweden,Department of Immunology, Genetics and Pathology, Section of Clinical Immunology, Uppsala University, Uppsala, Sweden
| | - Megan Sykes
- Columbia Center for Translational Immunology, Department of Medicine, Columbia University Medical Center, NY, USA.,Department of Microbiology & Immunology, Columbia University Medical Center, NY, USA and Department of Surgery, Columbia University Medical Center, NY, USA
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11
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Ensor CR, Goehring KC, Iasella CJ, Moore CA, Lendermon EA, McDyer JF, Morrell MR, Sciortino CM, Venkataramanan R, Wiland AM. Belatacept for maintenance immunosuppression in cardiothoracic transplantation: The potential frontier. Clin Transplant 2018; 32:e13363. [PMID: 30058177 DOI: 10.1111/ctr.13363] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Revised: 07/21/2018] [Accepted: 07/23/2018] [Indexed: 01/18/2023]
Abstract
Current immunosuppressive regimens with calcineurin inhibitors have improved the management of patients after transplantation. However, their adverse effects are linked to increased morbidity and limit the long-term survival of heart and lung transplant recipients. Belatacept, a costimulation inhibitor interfering with the interaction between CD28 on T cells and the B7 ligands on antigen presenting cells, has shown success and is currently approved for use in renal transplant recipients. Furthermore, it lacks many of the cardiovascular, metabolic, neurologic, and renal adverse of effects of calcineurin inhibitors that have the largest impact on long-term survival in cardiothoracic transplant. Additionally, it requires no therapeutic drug monitoring and is only administered once a month. Limitations to belatacept use have been observed that must be considered when comparing immunosuppression options. Despite this, maintenance immunosuppression with belatacept has the potential to improve outcomes in cardiothoracic transplant recipients, as it has with kidney transplant recipients. However, no large clinical trials investigating belatacept for maintenance immunosuppression in heart and lung transplant recipients exist. There is a large need for focused research of belatacept in cardiothoracic transplantation. Belatacept is a viable treatment option for maintenance immunosuppression, and it is reasonable to pursue more evidence in cardiothoracic transplant recipients.
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Affiliation(s)
- Christopher R Ensor
- Division of Pulmonary Allergy, and Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
| | | | - Carlo J Iasella
- Department of Pharmacy and Therapeutics, University of Pittsburgh School of Pharmacy, Pittsburgh, Pennsylvania
| | - Cody A Moore
- Department of Pharmacy and Therapeutics, University of Pittsburgh School of Pharmacy, Pittsburgh, Pennsylvania
| | - Elizabeth A Lendermon
- Division of Pulmonary Allergy, and Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
| | - John F McDyer
- Division of Pulmonary Allergy, and Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
| | - Matthew R Morrell
- Division of Pulmonary Allergy, and Critical Care Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
| | - Christopher M Sciortino
- Department of Cardiothoracic Surgery, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
| | - Raman Venkataramanan
- Department of Pharmaceutical Sciences, University of Pittsburgh School of Pharmacy, Pittsburgh, Pennsylvania
| | - Anne M Wiland
- Norvartis Pharmaceuticals Corporation, Baltimore, Maryland
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12
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Rowntree LC, Nguyen THO, Halim H, Purcell AW, Rossjohn J, Gras S, Kotsimbos TC, Mifsud NA. Inability To Detect Cross-Reactive Memory T Cells Challenges the Frequency of Heterologous Immunity among Common Viruses. THE JOURNAL OF IMMUNOLOGY 2018; 200:3993-4003. [DOI: 10.4049/jimmunol.1800010] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Accepted: 04/17/2018] [Indexed: 01/08/2023]
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13
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Infectious pathogens may trigger specific allo-HLA reactivity via multiple mechanisms. Immunogenetics 2017; 69:631-641. [PMID: 28718002 PMCID: PMC5537314 DOI: 10.1007/s00251-017-0989-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Accepted: 04/18/2017] [Indexed: 12/21/2022]
Abstract
Transplant recipients can be sensitized against allo-HLA antigens by previous transplantation, blood transfusion, or pregnancy. While there is growing awareness that multiple components of the immune system can act as effectors of the alloresponse, the role of infectious pathogen exposure in triggering sensitization and allograft rejection has remained a matter of much debate. Here, we describe that exposure to pathogens may enhance the immune response to allogeneic HLA antigens via different pathways. The potential role of allo-HLA cross-reactivity of virus-specific memory T cells, activation of innate immunity leading to a more efficient induction of the adaptive alloimmune response by antigen-presenting cells, and bystander activation of existing memory B cell activation will be discussed in this review.
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14
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Massart A, Ghisdal L, Abramowicz M, Abramowicz D. Operational tolerance in kidney transplantation and associated biomarkers. Clin Exp Immunol 2017; 189:138-157. [PMID: 28449211 DOI: 10.1111/cei.12981] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/19/2017] [Indexed: 12/30/2022] Open
Abstract
In the 1960s, our predecessors won a historical battle against acute rejection and ensured that transplantation became a common life-saving treatment. In parallel with this success, or perhaps because of it, we lost the battle for long-lived transplants, being overwhelmed with chronic immune insults and the toxicities of immunosuppression. It is likely that current powerful treatments block acute rejection, but at the same time condemn the few circulating donor cells that would have been able to elicit immunoregulatory host responses towards the allograft. Under these conditions, spontaneously tolerant kidney recipients - i.e. patients who maintain allograft function in the absence of immunosuppression - are merely accidents; they are scarce, mysterious and precious. Several teams pursue the goal of finding a biomarker that would guide us towards the 'just right' level of immunosuppression that avoids rejection while leaving some space for donor immune cells. Some cellular assays are attractive because they are antigen-specific, and provide a comprehensive view of immune responses toward the graft. These seem to closely follow patient regulatory capacities. However, these tests are cumbersome, and require abundant cellular material from both donor and recipient. The latest newcomers, non-antigen-specific recipient blood transcriptomic biomarkers, offer the promise that a practicable and simple signature may be found that overcomes the complexity of a system in which an infinite number of individual cell combinations can lead possibly to graft acceptance. Biomarker studies are as much an objective - identifying tolerant patients, enabling tolerance trials - as a means to deciphering the underlying mechanisms of one of the most important current issues in transplantation.
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Affiliation(s)
- A Massart
- Department of Nephrology, Dialysis, and Transplantation, CUB Hôpital Erasme and Institute of Interdisciplinary Research in Molecular and Human Biology (IRIBHM), Université Libre de Bruxelles, Brussels, Belgium
| | - L Ghisdal
- Department of Nephrology, Centre Hospitalier EpiCURA, Baudour, Belgium
| | - M Abramowicz
- Department of Human Genetics, CUB Hôpital Erasme and Institute of Interdisciplinary Research in Molecular and Human Biology (IRIBHM), Université Libre de Bruxelles, Brussels, Belgium
| | - D Abramowicz
- Department of Nephrology, Universitair Ziekenhuis Antwerpen and Antwerp University, Antwerp, Belgium
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15
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Benichou G, Gonzalez B, Marino J, Ayasoufi K, Valujskikh A. Role of Memory T Cells in Allograft Rejection and Tolerance. Front Immunol 2017; 8:170. [PMID: 28293238 PMCID: PMC5328996 DOI: 10.3389/fimmu.2017.00170] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2016] [Accepted: 02/02/2017] [Indexed: 12/30/2022] Open
Abstract
Memory T cells are characterized by their low activation threshold, robust effector functions, and resistance to conventional immunosuppression and costimulation blockade. Unlike their naïve counterparts, memory T cells reside in and recirculate through peripheral non-lymphoid tissues. Alloreactive memory T cells are subdivided into different categories based on their origins, phenotypes, and functions. Recipients whose immune systems have been directly exposed to allogeneic major histocompatibility complex (MHC) molecules display high affinity alloreactive memory T cells. In the absence of any prior exposure to allogeneic MHC molecules, endogenous alloreactive memory T cells are regularly generated through microbial infections (heterologous immunity). Regardless of their origin, alloreactive memory T cells represent an essential element of the allograft rejection process and a major barrier to tolerance induction in clinical transplantation. This article describes the different subsets of alloreactive memory T cells involved in transplant rejection and examine their generation, functional properties, and mechanisms of action. In addition, we discuss strategies developed to target deleterious allospecific memory T cells in experimental animal models and clinical settings.
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Affiliation(s)
- Gilles Benichou
- Center for Transplantation Sciences, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Bruno Gonzalez
- Center for Transplantation Sciences, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Jose Marino
- Center for Transplantation Sciences, Department of Surgery, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Katayoun Ayasoufi
- Department of Immunology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Anna Valujskikh
- Department of Immunology, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
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16
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Herr F, Brunel M, Roders N, Durrbach A. Co-stimulation Blockade Plus T-Cell Depletion in Transplant Patients: Towards a Steroid- and Calcineurin Inhibitor-Free Future? Drugs 2016; 76:1589-1600. [DOI: 10.1007/s40265-016-0656-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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17
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Abstract
Direct allorecognition is the process by which donor-derived major histocompatibility complex (MHC)-peptide complexes, typically presented by donor-derived ‘passenger’ dendritic cells, are recognised directly by recipient T cells. In this review, we discuss the two principle theories which have been proposed to explain why individuals possess a high-precursor frequency of T cells with direct allospecificity and how self-restricted T cells recognise allogeneic MHC-peptide complexes. These theories, both of which are supported by functional and structural data, suggest that T cells recognising allogeneic MHC-peptide complexes focus either on the allopeptides bound to the allo-MHC molecules or the allo-MHC molecules themselves. We discuss how direct alloimmune responses may be sustained long term, the consequences of this for graft outcome and highlight novel strategies which are currently being investigated as a potential means of reducing rejection mediated through this pathway.
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Affiliation(s)
- Dominic A Boardman
- MRC Centre for Transplantation, King's College London, Guy's Hospital, London, SE1 9RT UK ; NIHR Biomedical Research Centre, Guy's & St Thomas' NHS Foundation Trust & King's College London, Guy's Hospital, London, SE1 9RT UK
| | - Jacinta Jacob
- MRC Centre for Transplantation, King's College London, Guy's Hospital, London, SE1 9RT UK
| | - Lesley A Smyth
- MRC Centre for Transplantation, King's College London, Guy's Hospital, London, SE1 9RT UK ; School of Health, Sport and Bioscience, Stratford Campus, University of East London, London, E15 4LZ UK
| | - Giovanna Lombardi
- MRC Centre for Transplantation, King's College London, Guy's Hospital, London, SE1 9RT UK ; NIHR Biomedical Research Centre, Guy's & St Thomas' NHS Foundation Trust & King's College London, Guy's Hospital, London, SE1 9RT UK
| | - Robert I Lechler
- MRC Centre for Transplantation, King's College London, Guy's Hospital, London, SE1 9RT UK ; NIHR Biomedical Research Centre, Guy's & St Thomas' NHS Foundation Trust & King's College London, Guy's Hospital, London, SE1 9RT UK
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18
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Luo L, Li Z, Luo G, Zhao Y, Yang J, Chen H. Role of Wnt3a expressed by dendritic cells in the activation of canonical Wnt signaling and generation of memory T cells during primary immune responses. Cell Immunol 2016; 310:99-107. [PMID: 27544306 DOI: 10.1016/j.cellimm.2016.08.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Revised: 08/12/2016] [Accepted: 08/13/2016] [Indexed: 11/17/2022]
Abstract
The presence of memory T cells (TMs) hinders transplant survival. Dendritic cells (DCs) induce the generation of TMs during primary immune responses. However, the specific mechanisms are unclear. In this study, we constructed a Wnt3a-expressing adenovirus and used small interfering RNA (siRNA) targeting Wnt3a to investigate the influence of Wnt3a expression in DCs on the generation of TMs during primary immune responses. Our results demonstrated that the Wnt3a expression levels in DCs influenced the generation of TMs after 5days in co-culture with naïve T cells through activation of the Wnt canonical pathway. Interleukin-7 secretion levels in supernatants of DC/TNs co-cultures showed a similar pattern of Wnt3a expression levels in DCs. These findings provide a better understanding of TMs generation mechanisms that might be useful to improve transplant outcomes.
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Affiliation(s)
- Lei Luo
- Department of Research and Education, Guizhou Province People's Hospital, Guiyang 550002, China
| | - Zhengyu Li
- Department of Thoracic Surgery, Guizhou Province People's Hospital, Guiyang 550002, China
| | - Guangheng Luo
- Department of Urology, Guizhou Province People's Hospital, Guiyang 550002, China
| | - Yingting Zhao
- Department of Research and Education, Guizhou Province People's Hospital, Guiyang 550002, China
| | - Jing Yang
- Department of Cardiology, Guizhou Province People's Hospital, Guiyang 550002, China
| | - Hui Chen
- Department of Research and Education, Guizhou Province People's Hospital, Guiyang 550002, China.
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19
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Heutinck KM, Yong SL, Tonneijck L, van den Heuvel H, van der Weerd NC, van der Pant KAMI, Bemelman FJ, Claas FHJ, Ten Berge IJM. Virus-Specific CD8(+) T Cells Cross-Reactive to Donor-Alloantigen Are Transiently Present in the Circulation of Kidney Transplant Recipients Infected With CMV and/or EBV. Am J Transplant 2016; 16:1480-91. [PMID: 26603974 DOI: 10.1111/ajt.13618] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2015] [Revised: 10/05/2015] [Accepted: 10/24/2015] [Indexed: 01/25/2023]
Abstract
T cells play a dual role in transplantation: They mediate transplant rejection and are crucial for virus control. Memory T cells generated in response to pathogens can cross-react to alloantigen, a phenomenon called heterologous immunity. Virus-specific CD8(+) T cells cross-reacting to donor-alloantigen might affect alloimmune responses and hamper tolerance induction following transplantation. Here, we longitudinally studied these cross-reactive cells in peripheral blood of 25 kidney transplant recipients with a cytomegalovirus and/or Epstein-Barr virus infection. Cross-reactive T cells were identified by flow cytometry as virus-specific T cells that proliferate in response to donor cells in a mixed-lymphocyte reaction. In 13 of 25 patients, we found cross-reactivity to donor cells for at least 1 viral epitope before (n = 7) and/or after transplantation (n = 8). Cross-reactive T cells were transiently present in the circulation, and their precursor frequency did not increase following transplantation or viral infection. Cross-reactive T cells expressed interferon-γ and CD107a in response to both alloantigen and viral peptide and resembled virus-specific T cells in phenotype and function. Their presence was not associated with impaired renal function, proteinuria, or rejection. In conclusion, virus-specific T cells that cross-react to donor-alloantigen are transiently detectable in the circulation of kidney transplant recipients.
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Affiliation(s)
- K M Heutinck
- Department of Experimental Immunology, Academic Medical Center, Amsterdam, The Netherlands.,Renal Transplant Unit, Department of Nephrology, Division of Internal Medicine, Academic Medical Center, Amsterdam, The Netherlands
| | - S L Yong
- Department of Experimental Immunology, Academic Medical Center, Amsterdam, The Netherlands.,Renal Transplant Unit, Department of Nephrology, Division of Internal Medicine, Academic Medical Center, Amsterdam, The Netherlands
| | - L Tonneijck
- Department of Experimental Immunology, Academic Medical Center, Amsterdam, The Netherlands
| | - H van den Heuvel
- Department of Immunohaematology and Blood Transfusion, Leiden University Medical Center, Leiden, The Netherlands
| | - N C van der Weerd
- Renal Transplant Unit, Department of Nephrology, Division of Internal Medicine, Academic Medical Center, Amsterdam, The Netherlands
| | - K A M I van der Pant
- Renal Transplant Unit, Department of Nephrology, Division of Internal Medicine, Academic Medical Center, Amsterdam, The Netherlands
| | - F J Bemelman
- Renal Transplant Unit, Department of Nephrology, Division of Internal Medicine, Academic Medical Center, Amsterdam, The Netherlands
| | - F H J Claas
- Department of Immunohaematology and Blood Transfusion, Leiden University Medical Center, Leiden, The Netherlands
| | - I J M Ten Berge
- Renal Transplant Unit, Department of Nephrology, Division of Internal Medicine, Academic Medical Center, Amsterdam, The Netherlands
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20
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D'Orsogna LJ, Nguyen THO, Claas FHJ, Witt C, Mifsud NA. Endogenous-peptide-dependent alloreactivity: new scientific insights and clinical implications. ACTA ACUST UNITED AC 2014; 81:399-407. [PMID: 23646948 DOI: 10.1111/tan.12115] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
T-cell alloreactivity is generated via immune responsiveness directed against allogeneic (allo) human leucocyte antigen (HLA) molecules. Whilst the alloresponse is of extraordinary potency and frequency, it has often been assumed to be less peptide-specific than conventional T-cell reactivity. Recently, several human studies have shown that both alloreactive CD8(+) and CD4(+) T cells exhibit exquisite allo-HLA and endogenous peptide specificity that has also underpinned tissue-specific allorecognition. In this review, we summarize former and recent scientific evidence in support of endogenous peptide (self-peptide)-dependence of T-cell alloreactivity. The clinical implications of these findings will be discussed in the context of both solid organ transplantation and haematopoietic stem cell transplantation (HSCT). Insights into the understanding of the molecular basis of T-cell allorecognition will probably translate into improved allograft survival outcomes, lower frequencies of graft vs host disease and could potentially be exploited for selective graft vs leukaemia effect to improve clinical outcomes following HSCT.
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Affiliation(s)
- L J D'Orsogna
- Pathology and Laboratory Medicine, University of Western Australia, Perth, Australia.
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21
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Abstract
Organ transplantation appears today to be the best alternative to replace the loss of vital organs induced by various diseases. Transplants can, however, also be rejected by the recipient. In this review, we provide an overview of the mechanisms and the cells/molecules involved in acute and chronic rejections. T cells and B cells mainly control the antigen-specific rejection and act either as effector, regulatory, or memory cells. On the other hand, nonspecific cells such as endothelial cells, NK cells, macrophages, or polymorphonuclear cells are also crucial actors of transplant rejection. Last, beyond cells, the high contribution of antibodies, chemokines, and complement molecules in graft rejection is discussed in this article. The understanding of the different components involved in graft rejection is essential as some of them are used in the clinic as biomarkers to detect and quantify the level of rejection.
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Affiliation(s)
- Aurélie Moreau
- INSERM UMR 1064, Center for Research in Transplantation and Immunology-ITUN, CHU de Nantes 44093, France
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22
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Abstract
PURPOSE OF REVIEW Memory T cells present a different set of challenges to transplant patients; they are needed for protection against invading pathogens, especially under conditions of immunosuppression. But their presence also threatens transplant survival, as some of them are alloreactive. Efforts to resolve this paradox will be critical in the induction of transplant tolerance. RECENT FINDINGS There has been significant progress made in the past few years in the areas of population diversity of memory T cells, metabolic control of their induction, and mechanisms and pathways involved in memory cell exhaustion. Multiple targets on memory T cells have been identified, some of which are under vigorous testing in various transplant models. SUMMARY Memory T cells are both friends and foes to transplant patients, and tolerance strategies should selectively target alloreactive memory T cells and leave other memory cells unaltered. This situation remains a major challenge in the clinic.
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23
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Lakkis FG, Lechler RI. Origin and biology of the allogeneic response. Cold Spring Harb Perspect Med 2013; 3:3/8/a014993. [PMID: 23906882 DOI: 10.1101/cshperspect.a014993] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The recognition by the immune system of nonself determinants on cells, tissues, or organs transplanted between genetically disparate members of the same species can lead to a potent allogeneic response that is responsible for rejection. We review here fundamental concepts that underlie the origins and biology of allorecognition in the mammalian immune system. We examine why and how T cells are alloreactive and discuss emerging evidence of allorecognition by innate immune cells. The nature of T cells (naïve vs. memory) and the alloantigen presentation pathways (direct, indirect, and semidirect) that initiate the allogeneic response are outlined.
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Affiliation(s)
- Fadi G Lakkis
- Thomas E. Starzl Transplantation Institute, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15238, USA.
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24
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Wang C, Yi T, Qin L, Maldonado RA, von Andrian UH, Kulkarni S, Tellides G, Pober JS. Rapamycin-treated human endothelial cells preferentially activate allogeneic regulatory T cells. J Clin Invest 2013; 123:1677-93. [PMID: 23478407 DOI: 10.1172/jci66204] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2012] [Accepted: 01/17/2013] [Indexed: 12/17/2022] Open
Abstract
Human graft endothelial cells (ECs) can act as antigen-presenting cells to initiate allograft rejection by host memory T cells. Rapamycin, an mTOR inhibitor used clinically to suppress T cell responses, also acts on DCs, rendering them tolerogenic. Here, we report the effects of rapamycin on EC alloimmunogenicity. Compared with mock-treated cells, rapamycin-pretreated human ECs (rapa-ECs) stimulated less proliferation and cytokine secretion from allogeneic CD4+ memory cells, an effect mimicked by shRNA knockdown of mTOR or raptor in ECs. The effects of rapamycin persisted for several days and were linked to upregulation of the inhibitory molecules PD-L1 and PD-L2 on rapa-ECs. Additionally, rapa-ECs produced lower levels of the inflammatory cytokine IL-6. CD4+ memory cells activated by allogeneic rapa-ECs became hyporesponsive to restimulation in an alloantigen-specific manner and contained higher percentages of suppressive CD4+CD25(hi)CD127(lo)FoxP3+ cells that did not produce effector cytokines. In a human-mouse chimeric model of allograft rejection, rapamycin pretreatment of human arterial allografts increased graft EC expression of PD-L1 and PD-L2 and reduced subsequent infiltration of allogeneic effector T cells into the artery intima and intimal expansion. Preoperative conditioning of allograft ECs with rapamycin could potentially reduce immune-mediated rejection.
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Affiliation(s)
- Chen Wang
- Department of Immunobiology, Yale University School of Medicine, New Haven, Connecticut 06520-8089, USA
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25
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Ortiz YM, Arias LF, Álvarez CM, García LF. Memory phenotype and polyfunctional T cells in kidney transplant patients. Transpl Immunol 2013; 28:127-37. [DOI: 10.1016/j.trim.2013.02.003] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2012] [Revised: 02/19/2013] [Accepted: 02/20/2013] [Indexed: 10/27/2022]
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26
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Cross-reactive anti-viral T cells increase prior to an episode of viral reactivation post human lung transplantation. PLoS One 2013; 8:e56042. [PMID: 23405250 PMCID: PMC3566045 DOI: 10.1371/journal.pone.0056042] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2012] [Accepted: 01/09/2013] [Indexed: 01/11/2023] Open
Abstract
Human Cytomegalovirus (CMV) reactivation continues to influence lung transplant outcomes. Cross-reactivity of anti-viral memory T cells against donor human leukocyte antigens (HLA) may be a contributing factor. We identified cross-reactive HLA-A*02:01-restricted CMV-specific cytotoxic T lymphocytes (CTL) co-recognizing the NLVPMVATV (NLV) epitope and HLA-B27. NLV-specific CD8+ T cells were expanded for 13 days from 14 HLA-A*02:01/CMV seropositive healthy donors and 11 lung transplant recipients (LTR) then assessed for the production of IFN-γ and CD107a expression in response to 19 cell lines expressing either single HLA-A or -B class I molecules. In one healthy individual, we observed functional and proliferative cross-reactivity in response to B*27:05 alloantigen, representing approximately 5% of the NLV-specific CTL population. Similar patterns were also observed in one LTR receiving a B27 allograft, revealing that the cross-reactive NLV-specific CTL gradually increased (days 13-193 post-transplant) before a CMV reactivation event (day 270) and reduced to basal levels following viral clearance (day 909). Lung function remained stable with no acute rejection episodes being reported up to 3 years post-transplant. Individualized immunological monitoring of cross-reactive anti-viral T cells will provide further insights into their effects on the allograft and an opportunity to predict sub-clinical CMV reactivation events and immunopathological complications.
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27
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Luo L, Sun Z, Cheng H, Luo G. Memory T-cell-specific therapeutics attenuate allograft rejection via mediation of alloreactivity in memory cells. Immunol Lett 2012; 148:53-8. [PMID: 22902239 DOI: 10.1016/j.imlet.2012.08.001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2012] [Revised: 07/30/2012] [Accepted: 08/01/2012] [Indexed: 02/01/2023]
Abstract
Many means in inbred rodent models promoted long-term graft survival or donor-specific tolerance, but less so in nonhuman primates, outbred rodents or human patients. A diverse repertoire of memory T cells, derived from heterologous immunity or prior to exposure to alloantigen, has been believed to be an important part of this barrier. Memory T cells have a unique capacity to generate effector functions quickly upon re-exposure to antigen, and this capacity is achieved by reduced activation thresholds, and expressed high level trafficking and adhesion molecules, which is likely responsible for their exhibiting differential susceptibility to immune therapeutics compared with naïve T cells. This review outlines recent progress on characteristics of memory T cells and focuses on these potential therapies targeting memory T cells which are likely to ameliorate allograft rejection by inducing transplant tolerance.
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Affiliation(s)
- Lei Luo
- Department of Research and Education, Guizhou Province People's Hospital, Guiyang, China
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28
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Sagoo P, Lombardi G, Lechler RI. Relevance of regulatory T cell promotion of donor-specific tolerance in solid organ transplantation. Front Immunol 2012; 3:184. [PMID: 22811678 PMCID: PMC3395995 DOI: 10.3389/fimmu.2012.00184] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2012] [Accepted: 06/14/2012] [Indexed: 01/29/2023] Open
Abstract
Current clinical strategies to control the alloimmune response after transplantation do not fully prevent induction of the immunological processes which lead to acute and chronic immune-mediated graft rejection, and as such the survival of a solid organ allograft is limited. Experimental research on naturally occurring CD4+CD25highFoxP3+ Regulatory T cells (Tregs) has indicated their potential to establish stable long-term graft acceptance, with the promise of providing a more effective therapy for transplant recipients. Current approaches for clinical use are based on the infusion of freshly isolated or ex vivo polyclonally expanded Tregs into graft recipients with an aim to redress the in vivo balance of T effector cells to Tregs. However mounting evidence suggests that regulation of donor-specific immunity may be central to achieving immunological tolerance. Therefore, the next stages in optimizing translation of Tregs to organ transplantation will be through the refinement and development of donor alloantigen-specific Treg therapy. The altering kinetics and intensity of alloantigen presentation pathways and alloimmune priming following transplantation may indeed influence the specificity of the Treg required and the timing or frequency at which it needs to be administered. Here we review and discuss the relevance of antigen-specific regulation of alloreactivity by Tregs in experimental and clinical studies of tolerance and explore the concept of delivering an optimal Treg for the induction and maintenance phases of achieving transplantation tolerance.
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Affiliation(s)
- Pervinder Sagoo
- Department Transplantation, Immunoregulation and Mucosal Biology, MRC Centre for Transplantation, King's College London London, UK
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29
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Kim BS. Strategies to Overcome Memory T Cells Mediatied Allograft Injury. KOREAN JOURNAL OF TRANSPLANTATION 2012. [DOI: 10.4285/jkstn.2012.26.2.69] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Affiliation(s)
- Beom Seok Kim
- Division of Nephrology, Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea
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30
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Krummey SM, Ford ML. Heterogeneity within T Cell Memory: Implications for Transplant Tolerance. Front Immunol 2012; 3:36. [PMID: 22566919 PMCID: PMC3342058 DOI: 10.3389/fimmu.2012.00036] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Accepted: 02/15/2012] [Indexed: 12/16/2022] Open
Abstract
Adaptive immunity in both mouse and man results in the generation of immunological memory. Memory T cells are both friend and foe to transplant recipients, as they are intimately involved and in many cases absolutely required for the maintenance of protective immunity in the face immunosuppression, yet from the evidence presented herein they clearly constitute a formidable barrier for the successful implementation of tolerance induction strategies in transplantation. This review describes the experimental evidence demonstrating the increased resistance of memory T cells to many distinct tolerance induction strategies, and outlines recent advances in our knowledge of the ways in which alloreactive memory T cells arise in previously untransplanted individuals. Understanding the impact of alloreactive memory T cell specificity, frequency, and quality might allow for better donor selection in order to minimize the donor-reactive memory T cell barrier in an individual transplant recipient, thus allowing stratification of relative risk of alloreactive memory T cell mediated rejection, and conversely increase the likelihood of successful establishment of tolerance. However, further research into the molecular and cellular pathways involved in alloreactive memory T cell-mediated rejection is required in order to design new strategies to overcome the memory T cell barrier, without critically impairing protective immunity.
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Affiliation(s)
- Scott M Krummey
- Department of Surgery, Emory Transplant Center, Emory University Atlanta, GA, USA
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31
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Participation of blood vessel cells in human adaptive immune responses. Trends Immunol 2011; 33:49-57. [PMID: 22030237 DOI: 10.1016/j.it.2011.09.006] [Citation(s) in RCA: 107] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2011] [Revised: 09/12/2011] [Accepted: 09/13/2011] [Indexed: 12/29/2022]
Abstract
Circulating T cells contact blood vessels either when they extravasate across the walls of microvessels into inflamed tissues or when they enter into the walls of larger vessels in inflammatory diseases such as atherosclerosis. The blood vessel wall is largely composed of three cell types: endothelial cells lining the entire vascular tree; pericytes supporting the endothelium of microvessels; and smooth muscle cells forming the bulk of large vessel walls. Each of these cell types interacts with and alters the behavior of infiltrating T cells in different ways, making these cells active participants in the processes of immune-mediated inflammation. In this review, we compare and contrast what is known about the nature of these interactions in humans.
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32
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Abstract
Transplant tolerance, which allows grafts--allogeneic cells, tissues, or organs--to be accepted without host immunosuppression, can be achieved in mice but not in primates. In this issue of Science Translational Medicine, Nadazdin et al. report that a high pretransplant frequency of graft-reactive memory T cells may inhibit the induction of transplant tolerance in nonhuman primates and lead to transplant rejection. Knowing the frequency of allograft-specific memory T cells in potential transplant recipients could aid clinical decision-making by guiding selection of the antigenic profile of the donor organ or by influencing the type of tolerance-induction protocol pursued.
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33
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Afzali B, Mitchell P, Scottà C, Canavan J, Edozie FC, Fazekasova H, Lord GM, John S, Barber LD, Hernandez-Fuentes MP, Lechler RI, Lombardi G. Relative resistance of human CD4(+) memory T cells to suppression by CD4(+) CD25(+) regulatory T cells. Am J Transplant 2011; 11:1734-42. [PMID: 21749646 PMCID: PMC3815568 DOI: 10.1111/j.1600-6143.2011.03635.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Successful expansion of functional CD4(+) CD25(+) regulatory T cells (T(reg)) ex vivo under good manufacturing practice conditions has made T(reg) -cell therapy in clinical transplant tolerance induction a feasible possibility. In animals, T(reg) cells home to both transplanted tissues and local lymph nodes and are optimally suppressive if active at both sites. Therefore, they have the opportunity to suppress both naïve and memory CD4(+) CD25(-) T cells (Tresp). Clinical transplantation commonly involves depleting therapy at induction (e.g. anti-CD25), which favors homeostatic expansion of memory T cells. Animal models suggest that T(reg) cells are less suppressive on memory, compared with naïve Tresp that mediate allograft rejection. As a result, in the context of human T(reg) -cell therapy, it is important to define the effectiveness of T(reg) cells in regulating naïve and memory Tresp. Therefore, we compared suppression of peripheral blood naïve and memory Tresp by fresh and ex vivo expanded T(reg) cells using proliferation, cytokine production and activation marker expression (CD154) as readouts. With all readouts, naïve human Tresp were more suppressible by approximately 30% than their memory counterparts. This suggests that T(reg) cells may be more efficacious if administered before or at the time of transplantation and that depleting therapy should be avoided in clinical trials of T(reg) cells.
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Affiliation(s)
- B. Afzali
- MRC Centre for Transplantation and National Institute for Health Research (NIHR) Comprehensive Biomedical Research Centre at Guy’s and St Thomas’ NHS Foundation Trust, London, UK
,Corresponding author: Behdad Afzali,
| | - P.J. Mitchell
- MRC Centre for Transplantation and National Institute for Health Research (NIHR) Comprehensive Biomedical Research Centre at Guy’s and St Thomas’ NHS Foundation Trust, London, UK
| | - C. Scottà
- MRC Centre for Transplantation and National Institute for Health Research (NIHR) Comprehensive Biomedical Research Centre at Guy’s and St Thomas’ NHS Foundation Trust, London, UK
| | - J. Canavan
- MRC Centre for Transplantation and National Institute for Health Research (NIHR) Comprehensive Biomedical Research Centre at Guy’s and St Thomas’ NHS Foundation Trust, London, UK
| | - F. C. Edozie
- MRC Centre for Transplantation and National Institute for Health Research (NIHR) Comprehensive Biomedical Research Centre at Guy’s and St Thomas’ NHS Foundation Trust, London, UK
| | - H. Fazekasova
- MRC Centre for Transplantation and National Institute for Health Research (NIHR) Comprehensive Biomedical Research Centre at Guy’s and St Thomas’ NHS Foundation Trust, London, UK
| | - G. M. Lord
- MRC Centre for Transplantation and National Institute for Health Research (NIHR) Comprehensive Biomedical Research Centre at Guy’s and St Thomas’ NHS Foundation Trust, London, UK
| | - S. John
- Department of Immunobiology, King’s College London, London, UK
| | - L. D. Barber
- Department of Hematology, King’s College London, London, UK
| | - M. P. Hernandez-Fuentes
- MRC Centre for Transplantation and National Institute for Health Research (NIHR) Comprehensive Biomedical Research Centre at Guy’s and St Thomas’ NHS Foundation Trust, London, UK
| | - R. I. Lechler
- MRC Centre for Transplantation and National Institute for Health Research (NIHR) Comprehensive Biomedical Research Centre at Guy’s and St Thomas’ NHS Foundation Trust, London, UK
| | - G. Lombardi
- MRC Centre for Transplantation and National Institute for Health Research (NIHR) Comprehensive Biomedical Research Centre at Guy’s and St Thomas’ NHS Foundation Trust, London, UK
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34
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Boor PPC, Metselaar HJ, Jonge SD, Mancham S, van der Laan LJW, Kwekkeboom J. Human plasmacytoid dendritic cells induce CD8⁺ LAG-3⁺ Foxp3⁺ CTLA-4⁺ regulatory T cells that suppress allo-reactive memory T cells. Eur J Immunol 2011; 41:1663-74. [PMID: 21469126 DOI: 10.1002/eji.201041229] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2010] [Revised: 01/28/2011] [Accepted: 03/08/2011] [Indexed: 12/14/2022]
Abstract
Allo-reactive memory T cells are a major barrier for induction of immunological tolerance to allografts in humans. Here, we report that stimulation of unfractionated human T cells with TLR-stimulated allogeneic plasmacytoid dendritic cells (pDCs) induces CD8(+) regulatory T cells (Tregs) that inhibit T-cell allo-responses, including those of memory T cells. CD3(+) T cells were primed for 7 days with allogeneic pDCs that had been pre-stimulated with TLR-7 or TLR-9 ligands. While the T cells proliferated and produced cytokines during the priming culture, they were profoundly hypo-responsive to re-stimulation with the same allo-antigen in a second culture. Moreover, T cells primed by pDCs exerted donor-specific suppression on allo-responses of both unfractionated and memory CD3(+) T cells. The regulatory capacity of pDC-primed T cells was confined to CD8(+) LAG-3(+) Foxp3(+) CTLA-4(+) T cells, which suppressed allogeneic T-cell responses through a CTLA-4-dependent mechanism. Induction of CD8(+) Tregs by pDCs could be partially prevented by 1-methyl tryptophan, an inhibitor of indoleamine 2,3-dioxygenase. In conclusion, stimulation of human T cells by TLR-stimulated allogeneic pDCs induces CD8(+) Tregs that inhibit allogeneic T-cell responses, including memory T cells. Donor-derived pDCs may be considered as an immunotherapeutic tool to prevent activation of the recipient allo-reactive (memory) T-cell repertoire after allogeneic transplantation.
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Affiliation(s)
- Patrick P C Boor
- Department of Gastroenterology and Hepatology, Erasmus MC - University Medical Center, Rotterdam, The Netherlands
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35
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Abstract
Solid organ transplantation is the standard treatment to improve both the quality of life and survival in patients with various end-stage organ diseases. The primary barrier against successful transplantation is recipient alloimmunity and the need to be maintained on immunosuppressive therapies with associated side effects. Despite such treatments in renal transplantation, after death with a functioning graft, chronic allograft dysfunction (CAD) is the most common cause of late allograft loss. Recipient recognition of donor histocompatibility antigens, via direct, indirect, and semidirect pathways, is critically dependent on the antigen-presenting cell (APC) and elicits effector responses dominated by recipient T cells. In allograft rejection, the engagement of recipient and donor cells results in recruitment of T-helper (Th) cells of the Th1 and Th17 lineage to the graft. In cases in which the alloresponse is dominated by regulatory T cells (Tregs), rejection can be prevented and the allograft tolerated with minimum or no immunosuppression. Here, we review the pathways of allorecognition that underlie CAD and the T-cell effector phenotypes elicited as part of the alloresponse. Future therapies including depletion of donor-reactive lymphocytes, costimulation blockade, negative vaccination using dendritic cell subtypes, and Treg therapy are inferred from an understanding of these mechanisms of allograft rejection.
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36
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Tapirdamaz Ö, Mancham S, van der Laan LJW, Kazemier G, Thielemans K, Metselaar HJ, Kwekkeboom J. Detailed kinetics of the direct allo-response in human liver transplant recipients: new insights from an optimized assay. PLoS One 2010; 5:e14452. [PMID: 21206923 PMCID: PMC3012075 DOI: 10.1371/journal.pone.0014452] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2010] [Accepted: 11/18/2010] [Indexed: 12/17/2022] Open
Abstract
Conventional assays for quantification of allo-reactive T-cell precursor frequencies (PF) are relatively insensitive. We present a robust assay for quantification of PF of T-cells with direct donor-specificity, and establish the kinetics of circulating donor-specific T cells after liver transplantation (LTx). B cells from donor splenocytes were differentiated into professional antigen-presenting cells by CD40-engagement (CD40-B cells). CFSE-labelled PBMC from LTx-recipients obtained before and at several time points after LTx, were stimulated with donor-derived or 3rd party CD40-B cells. PF of donor-specific T cells were calculated from CFSE-dilution patterns, and intracellular IFN-γ was determined after re-stimulation with CD40-B cells. Compared to splenocytes, stimulations with CD40-B cells resulted in 3 to 5-fold higher responding T-cell PF. Memory and naïve T-cell subsets responded equally to allogeneic CD40-B cell stimulation. Donor-specific CD4+ and CD8+ T-cell PF ranged from 0.5 to 19% (median: 5.2%). One week after LTx, PF of circulating donor-specific CD4+ and CD8+ T cells increased significantly, while only a minor increase in numbers of T cells reacting to 3rd party allo-antigens was observed. One year after LTx numbers of CD4+ and CD8+ T cells reacting to donor antigens, as well as those reacting to 3rd party allo-antigens, were slightly lower compared to pre-transplant values. Moreover, CD4+ and CD8+ T cells responding to donor-derived, as well as those reacting to 3rd party CD40-B cells, produced less IFN-γ. In conclusion, our alternative approach enables detection of allo-reactive human T cells at high frequencies, and after application we conclude that donor-specific T-cell PF increase immediately after LTx. However, no evidence for a specific loss of circulating T-cells recognizing donor allo-antigens via the direct pathway up to 1 year after LTx was obtained, underscoring the relative insensitiveness of previous assays.
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Affiliation(s)
- Özlem Tapirdamaz
- Department of Gastroenterology and Hepatology, Erasmus MC University Medical Center, Rotterdam, The Netherlands
| | - Shanta Mancham
- Department of Gastroenterology and Hepatology, Erasmus MC University Medical Center, Rotterdam, The Netherlands
| | | | - Geert Kazemier
- Department of Surgery, Erasmus MC University Medical Center, Rotterdam, The Netherlands
| | - Kris Thielemans
- Laboratory of Molecular and Cellular Therapy, Vrije Universiteit Brussel, Brussels, Belgium
| | - Herold J. Metselaar
- Department of Gastroenterology and Hepatology, Erasmus MC University Medical Center, Rotterdam, The Netherlands
| | - Jaap Kwekkeboom
- Department of Gastroenterology and Hepatology, Erasmus MC University Medical Center, Rotterdam, The Netherlands
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37
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Quantitative and Functional Diversity of Cross-Reactive EBV-Specific CD8+ T Cells in a Longitudinal Study Cohort of Lung Transplant Recipients. Transplantation 2010; 90:1439-49. [DOI: 10.1097/tp.0b013e3181ff4ff3] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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38
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Overcoming the memory barrier in tolerance induction: molecular mimicry and functional heterogeneity among pathogen-specific T-cell populations. Curr Opin Organ Transplant 2010; 15:405-10. [PMID: 20616729 DOI: 10.1097/mot.0b013e32833b7916] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
PURPOSE OF REVIEW This review highlights recent advances in our understanding of the frequency and nature of alloreactivity among memory T-cell populations, and discusses recent successes in experimentally targeting these populations in order to prolong graft survival. RECENT FINDINGS Recent studies suggest that not only is alloreactivity present within peripheral T-cell compartments of normal healthy individuals, but cross-reactivity between viral-specific T cells and allotropes may in fact be a very common occurrence. Furthermore, this cross-reactivity functions at the level of molecular mimicry of T-cell receptor recognition. Therapeutics that specifically target cell surface molecules or effector pathways used by memory T cells to mediate graft rejection will likely be required in order to attenuate the donor-reactive memory T-cell response during transplantation. SUMMARY A major challenge facing the field over the next decade is to define the heterogeneity that exists within memory T-cell populations that impacts graft survival. Understanding the functional and phenotypic differences that modify the memory T-cell barrier to tolerance induction might allow a strategy in which strength of immunosuppression could be tailored to fit the immunological history of a given transplant recipient in order to minimize nonimmune toxicities, maximize protective immunity, and prolong graft survival.
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39
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Golshayan D, Wyss JC, Buckland M, Hernandez-Fuentes M, Lechler RI. Differential role of naïve and memory CD4 T-cell subsets in primary alloresponses. Am J Transplant 2010; 10:1749-59. [PMID: 20659087 DOI: 10.1111/j.1600-6143.2010.03180.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: 01/25/2023]
Abstract
The T cell response to major histocompatibility complex (MHC) alloantigens occurs via two main pathways. The direct pathway involves the recognition of intact allogeneic MHC:peptide complexes on donor cells and provokes uniquely high frequencies of responsive T cells. The indirect response results from alloantigens being processed like any other protein antigen and presented as peptide by autologous antigen-presenting cells. The frequencies of T cells with indirect allospecificity are orders of magnitude lower and comparable to other peptide-specific responses. In this study, we explored the contributions of naïve and memory CD4(+) T cells to these two pathways. Using an adoptive transfer and skin transplantation model we found that naive and memory CD4(+) T cells, both naturally occurring and induced by sensitization with multiple third-party alloantigens, contributed equally to graft rejection when only the direct pathway was operative. In contrast, the indirect response was predominantly mediated by the naïve subset. Elimination of regulatory CD4(+)CD25(+) T cells enabled memory cells to reject grafts through the indirect pathway, but at a much slower tempo than for naïve cells. These findings have implications for better targeting of immunosuppression to inhibit immediate and later forms of alloimmunity.
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Affiliation(s)
- D Golshayan
- Department of Medicine, Centre Hospitalier Universitaire Vaudois, Lausanne University, Lausanne, Switzerland.
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40
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Brehm MA, Daniels KA, Priyadharshini B, Thornley TB, Greiner DL, Rossini AA, Welsh RM. Allografts stimulate cross-reactive virus-specific memory CD8 T cells with private specificity. Am J Transplant 2010; 10:1738-48. [PMID: 20659086 PMCID: PMC2911646 DOI: 10.1111/j.1600-6143.2010.03161.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Viral infections have been associated with the rejection of transplanted allografts in humans and mice, and the induction of tolerance to allogeneic tissues in mice is abrogated by an ongoing viral infection and inhibited in virus-immune mice. One proposed mechanism for this 'heterologous immunity' is the induction of alloreactive T cell responses that cross-react with virus-derived antigens. These cross-reactive CD8 T cells are generated during acute viral infection and survive into memory, but their ability to partake in the immune response to allografts in vivo is not known. We show here that cross-reactive, virus-specific memory CD8 T cells from mice infected with LCMV proliferated in response to allografts. CD8 T cells specific to several LCMV epitopes proliferated in response to alloantigens, with the magnitude and hierarchy of epitope-specific responses varying with the private specificities of the host memory T cell repertoire, as shown by adoptive transfer studies. Last, we show that purified LCMV-specific CD8 T cells rejected skin allografts in SCID mice. These findings therefore implicate a potential role for heterologous immunity in virus-induced allograft rejection.
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Affiliation(s)
- Michael A. Brehm
- Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01655, USA, Department of Medicine, and Program in Immunology and Virology, University of Massachusetts Medical School, Worcester, MA 01655, USA
| | - Keith A. Daniels
- Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01655, USA
| | - Bhavana Priyadharshini
- Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01655, USA
| | - Thomas B. Thornley
- Department of Medicine, and Program in Immunology and Virology, University of Massachusetts Medical School, Worcester, MA 01655, USA
| | - Dale L. Greiner
- Department of Medicine, and Program in Immunology and Virology, University of Massachusetts Medical School, Worcester, MA 01655, USA
| | - Aldo A. Rossini
- Department of Medicine, and Program in Immunology and Virology, University of Massachusetts Medical School, Worcester, MA 01655, USA
| | - Raymond M. Welsh
- Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01655, USA
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41
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D'Orsogna LJA, Roelen DL, Doxiadis IIN, Claas FHJ. Alloreactivity from human viral specific memory T-cells. Transpl Immunol 2010; 23:149-55. [PMID: 20600900 DOI: 10.1016/j.trim.2010.06.008] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2010] [Accepted: 06/17/2010] [Indexed: 10/19/2022]
Abstract
The mechanisms by which alloreactive memory T-cells are generated in non-sensitized individuals have begun to be elucidated. It is generally accepted that a very high level of crossreactivity is an essential feature of the T-cell receptor. Indeed it has recently been shown that alloreactivity from viral specific memory T-cells is far more common than predicted, 45% of viral specific T-cell clones were found to be allo-HLA crossreactive. In this overview the evidence for crossreactive alloresponses from human viral specific memory T-cells is discussed with special emphasis on the unexpected high frequency of these crossreactive responses, the peptide and tissue specificity of the responses, and the mechanistic insights gleaned from the elucidation of the crystal structure of an allo-HLA crossreactive viral specific TCR. The possible implications for clinical solid organ and bone marrow transplantation and tolerance induction will be discussed.
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Affiliation(s)
- L J A D'Orsogna
- Dept of Immunohematology and Blood Transfusion, Leiden University Medical Centre, The Netherlands.
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42
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Van Der Windt DJ, Smetanka C, Macedo C, He J, Lakomy R, Bottino R, Ekser B, Echeverri GJ, Metes D, Ijzermans JNM, Trucco M, Cooper DKC, Lakkis FG. Investigation of lymphocyte depletion and repopulation using alemtuzumab (Campath-1H) in cynomolgus monkeys. Am J Transplant 2010; 10:773-783. [PMID: 20420638 DOI: 10.1111/j.1600-6143.2010.03050.x] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
As the target CD52 molecule is expressed on erythrocytes of most nonhuman primate strains, using alemtuzumab in these species would cause massive hemolysis. Six cynomolgus monkeys of Indonesian origin, screened by agglutination assay for absence of CD52 on erythrocytes, were administered alemtuzumab in a cumulative dose to a maximum of 60 mg/kg. In two monkeys, mycophenolate mofetil (MMF) was added as maintenance therapy. Complete depletion of T and B lymphocytes (>99.5%) was achieved with 20 mg/kg alemtuzumab and was more profound than in monkeys treated with antithymocyte globulin (n = 5), as quantified by flow cytometry. Repopulation was suppressed by weekly injections of 10 mg/kg. Without MMF, repopulation of CD20(+)B cells and CD8(+)T cells was complete within 2 and 3 months, respectively, and repopulation of CD4(+)T cells was 67% after 1 year. MMF significantly delayed CD4(+)T-cell repopulation. Among repopulating CD4(+) and CD8(+) T cells, a phenotypic shift was observed from CD45RA(hi)CD62L(hi) naïve cells toward CD45RA(lo)CD62L(lo) effector memory cells. In lymph nodes, the depletion of naïve cells was more profound than of memory cells, which may have initiated a proliferation of memory cells. This model offers opportunities to investigate lymphocyte depletion/repopulation phenomena, as well as the efficacy of alemtuzumab in preclinical transplantation models.
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Affiliation(s)
- D J Van Der Windt
- Thomas E. Starzl Transplantation Institute, Department of Surgery, University of Pittsburgh, Pittsburgh, PA.,Department of Pediatrics, Division of Immunogenetics, Children's Hospital of Pittsburgh, Pittsburgh, PA.,Department of Surgery, Erasmus University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - C Smetanka
- Thomas E. Starzl Transplantation Institute, Department of Surgery, University of Pittsburgh, Pittsburgh, PA
| | - C Macedo
- Thomas E. Starzl Transplantation Institute, Department of Surgery, University of Pittsburgh, Pittsburgh, PA
| | - J He
- Department of Pediatrics, Division of Immunogenetics, Children's Hospital of Pittsburgh, Pittsburgh, PA
| | - R Lakomy
- Department of Pediatrics, Division of Immunogenetics, Children's Hospital of Pittsburgh, Pittsburgh, PA
| | - R Bottino
- Department of Pediatrics, Division of Immunogenetics, Children's Hospital of Pittsburgh, Pittsburgh, PA
| | - B Ekser
- Thomas E. Starzl Transplantation Institute, Department of Surgery, University of Pittsburgh, Pittsburgh, PA
| | - G J Echeverri
- Thomas E. Starzl Transplantation Institute, Department of Surgery, University of Pittsburgh, Pittsburgh, PA.,Transplantation Unit, Fundacion Valle del Lili, Cali, Colombia
| | - D Metes
- Thomas E. Starzl Transplantation Institute, Department of Surgery, University of Pittsburgh, Pittsburgh, PA.,Department of Immunology, University of Pittsburgh, Pittsburgh, PA
| | - J N M Ijzermans
- Department of Surgery, Erasmus University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - M Trucco
- Department of Pediatrics, Division of Immunogenetics, Children's Hospital of Pittsburgh, Pittsburgh, PA
| | - D K C Cooper
- Thomas E. Starzl Transplantation Institute, Department of Surgery, University of Pittsburgh, Pittsburgh, PA
| | - F G Lakkis
- Thomas E. Starzl Transplantation Institute, Department of Surgery, University of Pittsburgh, Pittsburgh, PA.,Department of Immunology, University of Pittsburgh, Pittsburgh, PA
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43
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Abstract
Besides correcting devastating pathophysiology, cardiac transplantation in infancy offers an incomparable model for exploring the structure and function of the immune system. Infants and young children have relatively few memory B cells and T cells. Hence, the response of the young to allotransplantation better represents a primary immune response and may be better suited to testing spontaneous tolerance. Those who undergo cardiac transplantation in infancy are also unique because they are often subjected to thymectomy and depletion of mature T cells. These subjects can have a dramatic contraction of T cell diversity, allowing the testing of how diversity contributes to function.
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Affiliation(s)
- Jeffrey L. Platt
- Departments of Surgery and Microbiology and Immunology, University of Michigan, Ann Arbor, MI
| | - Marilia Cascalho
- Departments of Surgery and Microbiology and Immunology, University of Michigan, Ann Arbor, MI
| | - Lori West
- Departments of Pediatrics, Surgery and Immunology, University of Alberta at Edmonton
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44
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Macedo C, Orkis EA, Popescu I, Elinoff BD, Zeevi A, Shapiro R, Lakkis FG, Metes D. Contribution of naïve and memory T-cell populations to the human alloimmune response. Am J Transplant 2009; 9:2057-66. [PMID: 19624567 DOI: 10.1111/j.1600-6143.2009.02742.x] [Citation(s) in RCA: 132] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
T-cell alloimmunity plays a dominant role in allograft rejection. The precise contribution of naïve and memory T cells to this response however remains unclear. To address this question, we established an ex vivo flow-cytometric assay that simultaneously measures proliferation, precursor frequency and effector molecule (IFNgamma, granzyme B/perforin) production of alloreactive T cells. By applying this assay to peripheral blood mononuclear cells from healthy volunteers, we demonstrate that the CD4+ and CD8+ populations mount similar proliferative responses and contain comparable frequencies of alloreactive precursors. Effector molecule expression, however, was significantly higher among CD8+ T cells. Analysis of sorted naïve and memory T cells showed that alloreactive precursors were equally present in both populations. The CD8+ effector and terminally differentiated effector memory subsets contained the highest proportion of granzyme B/perforin after allostimulation, suggesting that these cells present a significant threat to transplanted organs. Finally, we demonstrate that virus-specific lymphocytes contribute significantly to the alloresponse in certain responder-stimulator HLA combinations, underscoring the importance of T-cell cross-reactivity in alloimmunity. These results provide a quantitative assessment of the roles of naïve and memory T-cell subsets in the normal human alloimmune response and establish a platform for measuring T-cell alloreactivity pre- and posttransplantation.
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Affiliation(s)
- C Macedo
- Human Immunology Program, Thomas E. Starzl Transplantation Institute, University of Pittsburgh, Pittsburgh, PA, USA
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45
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Raedler H, Yang M, Lalli PN, Medof ME, Heeger PS. Primed CD8(+) T-cell responses to allogeneic endothelial cells are controlled by local complement activation. Am J Transplant 2009; 9:1784-95. [PMID: 19563342 DOI: 10.1111/j.1600-6143.2009.02723.x] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
CD8 T cells primed by transplantation recognize allogeneic class I MHC molecules expressed on graft vascular endothelium and contribute to allograft injury. We previously showed that immune cell-derived complement activation fragments are integral to T cell activation/expansion. Herein we tested the impact of local complement production/activation on T cell/endothelial cell (EC) interactions. We found that proinflammatory cytokines upregulated alternative pathway complement production by ECs, yielding C5a. We further found that ECs deficient in the cell surface C3/C5 convertase regulator decay accelerating factor (DAF, CD55) induced greater CD8 T-cell proliferation and more IFNgamma(+) and perforin(+) effector cells than wild-type (WT) ECs. Allogeneic C3(-/-) EC induced little or no CD8 responses. Abrogation of responses following C5a receptor (C5aR) blockade, or augmentation following addition of recombinant C5a demonstrated that the effects were mediated through T-cell-expressed-C5aR interactions. Analyses of in vivo CD8 cell responses to transplanted heart grafts deficient in EC DAF showed similar augmentation. The findings reveal that EC-derived complement triggers secondary CD8 T-cell differentiation and expansion and argue that targeting complement and/or C5aR could limit T-cell-mediated graft injury.
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Affiliation(s)
- H Raedler
- Department of Medicine, Recanati Transplant Institute, Mount Sinai School of Medicine, New York, NY, USA
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46
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D'Orsogna LJ, Amir AL, Zoet YM, van der Meer-Prins PMW, van der Slik AR, Kester MGD, Heemskerk MHM, Doxiadis IIN, Roelen DL, Claas FHJ. New tools to monitor the impact of viral infection on the alloreactive T-cell repertoire. ACTA ACUST UNITED AC 2009; 74:290-7. [PMID: 19624615 DOI: 10.1111/j.1399-0039.2009.01311.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Accumulating evidence suggests that alloreactive memory T-cells may be generated as a result of viral infection. So far, a suitable tool to define the individual human leukocyte antigen (HLA) cross-reactivity of virus-specific memory T-cells is not available. We therefore aimed to develop a novel system for the detection of cross-reactive alloresponses using single HLA antigen expressing cell lines (SALs) as stimulator. Herein, we generated Epstein-Barr Virus (EBV) EBNA3A specific CD8 memory T-cell clones (HLA-B*0801/FLRGRAYGL peptide restricted) and assayed for alloreactivity against a panel of SALs using interferon-gamma Elispot as readout. Generation of the T-cell clones was performed by single cell sorting based on staining with viral peptide/major histocompatibility complex-specific tetramer. Monoclonality of the T-cell clones was confirmed by T-cell receptor (TCR) polymerase chain reaction analysis. First, we confirmed the previously described alloreactivity of the EBV EBNA3A-specific T-cell clones against SAL-expressing HLA-B*4402. Further screening against the entire panel of SALs also showed additional cross-reactivity against SAL-expressing HLA-B*5501. Functionality of the cross-reactive T-cell clones was confirmed by chromium release assay using phytohemagglutinin blasts as targets. SALs are an effective tool to detect cross-reactivity of viral-specific CD8 memory T-cell clones against individual class I HLA molecules. This technique may have important implications for donor selection and monitoring of transplant recipients.
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Affiliation(s)
- L J D'Orsogna
- Department of Immunohematology and Blood Transfusion, Leiden University Medical Centre, Leiden, The Netherlands.
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47
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Zheng H, Matte-Martone C, Jain D, McNiff J, Shlomchik WD. Central memory CD8+ T cells induce graft-versus-host disease and mediate graft-versus-leukemia. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2009; 182:5938-48. [PMID: 19414745 PMCID: PMC9844260 DOI: 10.4049/jimmunol.0802212] [Citation(s) in RCA: 90] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
In allogeneic hemopoietic stem cell transplantation, mature donor alphabeta T cells in the allograft promote T cell reconstitution in the recipient and mediate the graft-vs-leukemia (GVL) effect. Unfortunately, donor T cells can attack nonmalignant host tissues and cause graft-vs-host disease (GVHD). It has previously been shown that effector memory T cells not primed to alloantigen do not cause GVHD yet transfer functional T cell memory and mediate GVL. Recently, central memory T cells (T(CM)) have also been reported to not cause GVHD. In contrast, in this study, we demonstrate that purified CD8(+) T(CM) not specifically primed to alloantigens mediate GVHD in the MHC-mismatched C57BL/6 (B6)-->BALB/c and the MHC-matched, multiple minor histocompatibility Ag-mismatched C3H.SW-->B6 strain pairings. CD8(+) T(CM) and naive T cells (T(N)) caused similar histological disease in liver, skin, and bowel. B6 CD8(+) T(CM) and T(N) similarly expanded in BALB/c recipients, and the majority of their progeny produced IFN-gamma upon restimulation. However, in both models, CD8(+) T(CM) induced milder clinical GVHD than did CD8(+) T(N). Nonetheless, CD8(+) T(CM) and T(N) were similarly potent mediators of GVL against a mouse model of chronic-phase chronic myelogenous leukemia. Thus, in contrast to what was previously thought, CD8(+) T(CM) are capable of inducing GVHD and are substantially different from T(EM) but only subtly so from T(N).
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Affiliation(s)
- Hong Zheng
- Penn State Milton S. Hershey Medical Center, Department of Medicine, Hershey, PA
| | - Catherine Matte-Martone
- Yale Cancer Center and Department of Immunobiology, Yale University School of Medicine, New Haven, CT
| | - Dhanpat Jain
- Department of Pathology, Yale University School of Medicine, New Haven, CT
| | - Jennifer McNiff
- Department of Dermatology, Yale University School of Medicine, New Haven, CT
| | - Warren D. Shlomchik
- Yale Cancer Center and Department of Immunobiology, Yale University School of Medicine, New Haven, CT,Correspondence: Warren D. Shlomchik, Yale Comprehensive Cancer Center, PO Box 208032, Yale University School of Medicine, New Haven, CT 06520-8032,
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48
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Abstract
Clinical and experimental evidences suggest that alloreactive memory T cells may be part of the normal T-cell repertoire and that such cells are detrimental to the survival of foreign organ allografts induced by the administration of conventional immunosuppression or experimental tolerance-inducing therapies. The potential mechanisms by which alloreactive memory T cell may form a barrier to the induction of tolerance will be discussed.
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Affiliation(s)
- Nick D Jones
- Nuffield Department of Surgery, Transplantation Research Immunology Group, University of Oxford, John Radcliffe Hospital, Oxford, United Kingdom
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49
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Abstract
In organ transplantation, blood borne cells and macromolecules (e.g., antibodies) of the host immune system are brought into direct contact with the endothelial cell lining of graft vessels. In this location, graft endothelial cells play several roles in allograft rejection, including the initiation of rejection responses by presentation of alloantigen to circulating T cells; the development of inflammation and thrombosis; and as targets of injury and agents of repair.
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50
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Abstract
In organ transplantation, blood borne cells and macromolecules (e.g., antibodies) of the host immune system are brought into direct contact with the endothelial cell lining of graft vessels. In this location, graft endothelial cells play several roles in allograft rejection, including the initiation of rejection responses by presentation of alloantigen to circulating T cells; the development of inflammation and thrombosis; and as targets of injury and agents of repair.
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