1
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Dziarmaga R, Ke D, Sapir-Pichhadze R, Cardinal H, Phan V, Piccirillo CA, Mazer B, Foster BJ. Age- and sex-mediated differences in T lymphocyte populations of kidney transplant recipients. Pediatr Transplant 2022; 26:e14150. [PMID: 34569133 DOI: 10.1111/petr.14150] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 09/10/2021] [Accepted: 09/13/2021] [Indexed: 11/29/2022]
Abstract
BACKGROUND Graft failure rates increase through childhood and adolescence, decline in adulthood, and are higher in female than male kidney transplant recipients (KTR) until middle age. We aimed to describe age- and sex-related differences in T-cell subsets among KTR to determine which differences may help to explain the differences in kidney graft failure rates. METHODS Effector T (Teff)-cell and regulatory T (Treg)-cell phenotypes in PBMCs from healthy controls and KTR, who were at least 1 year post-transplant with stable graft function under immunosuppression, were analyzed by flow cytometry. The effects of age, sex, and status (KTR or control) were analyzed using linear regressions. RESULTS We enrolled 20 male and 21 female KTR and 20 male and 20 female controls between 3 and 29 years of age. CD3+ T-cell frequencies were not associated with age or sex but were higher in KTR than controls. There were no differences in CD4+ and CD8+ frequencies. Th1 (IFNγ+ IL-4- IL-17A-) and Th17 (IL-17A+) frequencies within the CD4+ T-cell population were higher at older ages. The frequencies of FOXP3 + Helios + Treg cells in CD4+ CD25+ CD127- T cells were lower in females than males and in KTR than controls. CONCLUSIONS Increasing frequencies of Th1 and Th17 cells with increasing age mirrors the increasing graft failure rates from childhood to young adulthood. Importantly, sex differences in frequencies of circulating Treg cells may suggest a role in the sex differences in graft failure rates.
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Affiliation(s)
- Robert Dziarmaga
- Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada.,Division of Experimental Medicine, McGill University, Montreal, Quebec, Canada
| | - Danbing Ke
- Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada
| | - Ruth Sapir-Pichhadze
- Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada.,Division of Nephrology and Multi-Organ Transplant Program, McGill University, Montreal, Quebec, Canada.,Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, Quebec, Canada
| | - Héloïse Cardinal
- Département de Médecine, Université de Montréal, Montreal, Quebec, Canada.,Centre de Recherche du Centre Hospitalier de l'Université de Montréal, Montreal, Quebec, Canada
| | - Véronique Phan
- Département de Pédiatrie, Université de Montréal, Montreal, Quebec, Canada.,Centre Hospitalier Universitaire Sainte-Justine, Montreal, Quebec, Canada
| | - Ciriaco A Piccirillo
- Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada.,Department of Microbiology and Immunology, McGill University, Montreal, Quebec, Canada
| | - Bruce Mazer
- Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada.,Division of Experimental Medicine, McGill University, Montreal, Quebec, Canada.,Department of Pediatrics, McGill University, Montreal, Quebec, Canada
| | - Bethany J Foster
- Research Institute of the McGill University Health Centre, Montreal, Quebec, Canada.,Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Montreal, Quebec, Canada.,Department of Pediatrics, McGill University, Montreal, Quebec, Canada
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2
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Leino AD, Pai MP. Maintenance Immunosuppression in Solid Organ Transplantation: Integrating Novel Pharmacodynamic Biomarkers to Inform Calcineurin Inhibitor Dose Selection. Clin Pharmacokinet 2020; 59:1317-1334. [PMID: 32720300 DOI: 10.1007/s40262-020-00923-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Calcineurin inhibitors, the primary immunosuppressive therapy used to prevent alloreactivity of transplanted organs, have a narrow therapeutic index. Currently, treatment is individualized based on clinical assessment of the risk of rejection or toxicity guided by trough concentration monitoring. Advances in immune monitoring have identified potential markers that may have value in understanding calcineurin inhibitor pharmacodynamics. Integration of these markers has the potential to complement therapeutic drug monitoring. Existing pharmacokinetic-pharmacodynamic (PK-PD) data is largely limited to correlation between the biomarker and trough concentrations at single time points. Immune related gene expression currently has the most evidence supporting PK-PD integration. Novel biomarker-based approaches to pharmacodynamic monitoring including development of enhanced PK-PD models are proposed to realize the full clinical benefit.
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Affiliation(s)
- Abbie D Leino
- Department of Clinical Pharmacy, College of Pharmacy, University of Michigan, 428 Church Street, Rm 3569, Ann Arbor, MI, 48109, USA
| | - Manjunath P Pai
- Department of Clinical Pharmacy, College of Pharmacy, University of Michigan, 428 Church Street, Rm 3569, Ann Arbor, MI, 48109, USA.
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3
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Long-Term Redistribution of Peripheral Lymphocyte Subpopulations after Switching from Calcineurin to mTOR Inhibitors in Kidney Transplant Recipients. J Clin Med 2020; 9:jcm9041088. [PMID: 32290462 PMCID: PMC7230655 DOI: 10.3390/jcm9041088] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 04/08/2020] [Accepted: 04/08/2020] [Indexed: 01/04/2023] Open
Abstract
Classical immunosuppression based on steroids, calcineurin inhibitors, and mycophenolate results in several unwanted effects and unsatisfactory long-term outcomes in kidney transplantation (KT). New immunosuppressors search for fewer adverse events and increased graft survival but may have a distinct impact on graft function and immunological biomarkers according to their mechanism of action. This prospective study evaluates the immunological effect of tacrolimus to serine/threonine protein kinase mechanistic target of rapamycin inhibitors (mTORi) conversion in 29 KT recipients compared with 16 controls maintained on tacrolimus. We evaluated renal function, human leukocyte antigen (HLA) antibodies and peripheral blood lymphocyte subsets at inclusion and at 3, 12, and 24 months later. Twenty immunophenotyped healthy subjects served as reference. Renal function remained stable in both groups with no significant change in proteinuria. Two patients in the mTORi group developed HLA donor-specific antibodies and none in the control group (7% vs. 0%, p = 0.53). Both groups showed a progressive increase in regulatory T cells, more prominent in patients converted to mTORi within the first 18 months post-KT (p < 0.001). All patients showed a decrease in naïve B cells (p < 0.001), excepting those converted to mTORi without receiving steroids (p = 0.31). Transitional B cells significantly decreased in mTORi patients (p < 0.001), independently of concomitant steroid treatment. Finally, CD56bright and CD94/NK group 2 member A receptor positive (NKG2A+) Natural Killer (NK) cell subsets increased in mTORi- compared to tacrolimus-treated patients (both p < 0.001). Patients switched to mTORi displayed a significant redistribution of peripheral blood lymphocyte subpopulations proposed to be associated with graft outcomes. The administration of steroids modified some of these changes.
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4
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Bentata Y. Tacrolimus: 20 years of use in adult kidney transplantation. What we should know about its nephrotoxicity. Artif Organs 2019; 44:140-152. [PMID: 31386765 DOI: 10.1111/aor.13551] [Citation(s) in RCA: 73] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2019] [Revised: 07/22/2019] [Accepted: 07/28/2019] [Indexed: 12/21/2022]
Abstract
Tacrolimus (or FK506), a calcineurin inhibitor (CNI) introduced in field of transplantation in the 1990s, is the cornerstone of most immunosuppressive regimens in solid organ transplantation. Its use has revolutionized the future of kidney transplantation (KT) and has been associated with better graft survival, a lower incidence of rejection, and improved drug tolerance with fewer side effects compared to cyclosporine. However, its monitoring remains complicated and underexposure increases the risk of rejection, whereas overexposure increases the risk of adverse effects, primarily nephrotoxicity, neurotoxicity, infections, malignancies, diabetes, and gastrointestinal complaints. Tacrolimus nephrotoxicity can be nonreversible and can lead to kidney graft loss, and its diagnosis is therefore best made with reference to the clinical context and after exclusion of other causes of graft dysfunction. Many factors contribute to its development including: systemic levels of tacrolimus; local renal exposure to tacrolimus; exposure to metabolites of tacrolimus; local susceptibility factors for CNI nephrotoxicity independent of systemic or local tacrolimus levels, such as the age of a kidney; local renal P-glycoprotein, local intestinal and hepatic cytochrome P450A3, and renin angiotensin system activation. The aim of this review is to describe the pharmacokinetics, pharmacodynamics, and mechanisms of acute and chronic tacrolimus nephrotoxicity in adult KT.
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Affiliation(s)
- Yassamine Bentata
- Nephrology and Kidney Transplantation Unit, University Hospital Mohammed VI, University Mohammed First, Oujda, Morocco.,Laboratory of Epidemiology, Clinical Research and Public Health, Medical School, University Mohammed First, Oujda, Morocco
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5
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Therapeutic Drug Monitoring of Tacrolimus-Personalized Therapy: Second Consensus Report. Ther Drug Monit 2019; 41:261-307. [DOI: 10.1097/ftd.0000000000000640] [Citation(s) in RCA: 227] [Impact Index Per Article: 45.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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6
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Brunet M, van Gelder T, Åsberg A, Haufroid V, Hesselink DA, Langman L, Lemaitre F, Marquet P, Seger C, Shipkova M, Vinks A, Wallemacq P, Wieland E, Woillard JB, Barten MJ, Budde K, Colom H, Dieterlen MT, Elens L, Johnson-Davis KL, Kunicki PK, MacPhee I, Masuda S, Mathew BS, Millán O, Mizuno T, Moes DJAR, Monchaud C, Noceti O, Pawinski T, Picard N, van Schaik R, Sommerer C, Vethe NT, de Winter B, Christians U, Bergan S. Therapeutic Drug Monitoring of Tacrolimus-Personalized Therapy: Second Consensus Report. Ther Drug Monit 2019. [DOI: 10.1097/ftd.0000000000000640
expr 845143713 + 809233716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
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7
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Grimbert P, Thaunat O. mTOR inhibitors and risk of chronic antibody-mediated rejection after kidney transplantation: where are we now? Transpl Int 2018; 30:647-657. [PMID: 28445619 DOI: 10.1111/tri.12975] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Revised: 02/13/2017] [Accepted: 04/21/2017] [Indexed: 12/28/2022]
Abstract
Antibody-mediated rejection (AMR) usually starts with generation of donor-specific anti-HLA antibodies (DSAs), arising from a B-cell response to antigen recognition. In vitro and preclinical data demonstrate that mammalian target of rapamycin (mTOR) inhibition attenuates the mTOR-mediated intracellular signaling pathway involved in AMR-related kidney damage. The limited available data from immunological studies in kidney transplant patients, however, have not shown such effects in vivo. In terms of clinical immunosuppression, the overriding influence on rates of de novo DSA (dnDSA) or AMR-regardless of the type of regimen-is patient adherence. To date, limited data from patients given mTOR inhibitor therapy with adequate concurrent immunosuppression, such as reduced-exposure calcineurin inhibitor (CNI) therapy, have not shown an adverse effect on the risk of dnDSA or AMR. Early switch to an mTOR inhibitor (<6-12 months post-transplant) in a CNI-free regimen, in contrast, can increase the risk of dnDSA, especially if adjunctive therapy is inadequate. Late conversion to CNI-free therapy with mTOR inhibition does not appear to affect the risk of dnDSA. More data, from prospective studies, are required to fully understand that association between use of mTOR inhibitors with different types of concomitant therapy and risk of dnDSA and AMR.
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Affiliation(s)
- Philippe Grimbert
- Unité INSERM 955 CHU Henri Mondor, Service de Néphrologie et Transplantation, Pôle Cancérologie-Immunité-Transplantation-Infectiologie (CITI), Université Paris-Est (UPEC), Paris, France.,Service de Transplantation, Néphrologie et Immunologie Clinique, INSERM U1111, Hospices Civils de Lyon, Hôpital Edouard Herriot, Université Lyon-I, Lyon, France
| | - Olivier Thaunat
- Unité INSERM 955 CHU Henri Mondor, Service de Néphrologie et Transplantation, Pôle Cancérologie-Immunité-Transplantation-Infectiologie (CITI), Université Paris-Est (UPEC), Paris, France.,Service de Transplantation, Néphrologie et Immunologie Clinique, INSERM U1111, Hospices Civils de Lyon, Hôpital Edouard Herriot, Université Lyon-I, Lyon, France
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8
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Amrouche K, Jamin C. Influence of drug molecules on regulatory B cells. Clin Immunol 2017; 184:1-10. [DOI: 10.1016/j.clim.2017.04.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Accepted: 04/27/2017] [Indexed: 02/07/2023]
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9
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Spatola R, Nadelstein B, Berdoulay A, English RV. The effects of topical aqueous sirolimus on tear production in normal dogs and dogs with refractory dry eye. Vet Ophthalmol 2017; 21:255-263. [DOI: 10.1111/vop.12503] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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10
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He X, Koenen HJ, Slaats JH, Joosten I. Stabilizing human regulatory T cells for tolerance inducing immunotherapy. Immunotherapy 2017; 9:735-751. [PMID: 28771099 DOI: 10.2217/imt-2017-0017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Many autoimmune diseases develop as a consequence of an altered balance between autoreactive immune cells and suppressive FOXP3+ Treg. Restoring this balance through amplification of Treg represents a promising strategy to treat disease. However, FOXP3+ Treg might become unstable especially under certain inflammatory conditions, and might transform into proinflammatory cytokine-producing cells. The issue of heterogeneity and instability of Treg has caused considerable debate in the field and has important implications for Treg-based immunotherapy. In this review, we discuss how Treg stability is defined and what the molecular mechanisms underlying the maintenance of FOXP3 expression and the regulation of Treg stability are. Also, we elaborate on current strategies used to stabilize human Treg for clinical purposes. This review focuses on human Treg, but considering that cell-intrinsic mechanisms to regulate Treg stability in mice and in humans might be similar, data derived from mice studies are also discussed in this paper.
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Affiliation(s)
- Xuehui He
- Laboratory of Medical Immunology, Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen, The Netherlands.,College of Computer Science, Qinghai Normal University, Xining, Qinghai, China
| | - Hans Jpm Koenen
- Laboratory of Medical Immunology, Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Jeroen Hr Slaats
- Laboratory of Medical Immunology, Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Irma Joosten
- Laboratory of Medical Immunology, Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen, The Netherlands
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11
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Utomo WK, de Vries M, Braat H, Bruno MJ, Parikh K, Comalada M, Peppelenbosch MP, van Goor H, Fuhler GM. Modulation of Human Peripheral Blood Mononuclear Cell Signaling by Medicinal Cannabinoids. Front Mol Neurosci 2017; 10:14. [PMID: 28174520 PMCID: PMC5258717 DOI: 10.3389/fnmol.2017.00014] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2016] [Accepted: 01/11/2017] [Indexed: 01/28/2023] Open
Abstract
Medical marijuana is increasingly prescribed as an analgesic for a growing number of indications, amongst which terminal cancer and multiple sclerosis. However, the mechanistic aspects and properties of cannabis remain remarkably poorly characterized. In this study we aimed to investigate the immune-cell modulatory properties of medical cannabis. Healthy volunteers were asked to ingest medical cannabis, and kinome profiling was used to generate comprehensive descriptions of the cannabis challenge on inflammatory signal transduction in the peripheral blood of these volunteers. Results were related to both short term and long term effects in patients experimentally treated with a medical marijuana preparation for suffering from abdominal pain as a result of chronic pancreatitis or other causes. The results reveal an immunosuppressive effect of cannabinoid preparations via deactivation of signaling through the pro-inflammatory p38 MAP kinase and mTOR pathways and a concomitant deactivation of the pro-mitogenic ERK pathway. However, long term cannabis exposure in two patients resulted in reversal of this effect. While these data provide a powerful mechanistic rationale for the clinical use of medical marijuana in inflammatory and oncological disease, caution may be advised with sustained use of such preparations.
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Affiliation(s)
- Wesley K Utomo
- Department of Gastroenterology and Hepatology, Erasmus MC, Erasmus University of Rotterdam Rotterdam, Netherlands
| | - Marjan de Vries
- Department of Surgery, Radboud University Medical Center Nijmegen, Netherlands
| | - Henri Braat
- Department of Gastroenterology and Hepatology, Erasmus MC, Erasmus University of Rotterdam Rotterdam, Netherlands
| | - Marco J Bruno
- Department of Gastroenterology and Hepatology, Erasmus MC, Erasmus University of Rotterdam Rotterdam, Netherlands
| | - Kaushal Parikh
- Department of Cell Biology, University Medical Center Groningen Groningen, Netherlands
| | | | - Maikel P Peppelenbosch
- Department of Gastroenterology and Hepatology, Erasmus MC, Erasmus University of Rotterdam Rotterdam, Netherlands
| | - Harry van Goor
- Department of Surgery, Radboud University Medical Center Nijmegen, Netherlands
| | - Gwenny M Fuhler
- Department of Gastroenterology and Hepatology, Erasmus MC, Erasmus University of Rotterdam Rotterdam, Netherlands
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12
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Tolerance in Kidney Transplantation: What Is on the B Side? Mediators Inflamm 2016; 2016:8491956. [PMID: 27956762 PMCID: PMC5121468 DOI: 10.1155/2016/8491956] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2016] [Accepted: 10/12/2016] [Indexed: 11/17/2022] Open
Abstract
Regulatory B cells (Breg) are in the spotlight for their role in immune homeostasis maintenance and tolerance achievement as in the last years the correlation with functional and increased Breg numbers in autoimmune diseases and transplantation has been extensively proven. Their study is, however, in its infancy with still little knowledge and consensus on their origin, phenotype, and mechanism of action. All this hampers the pursuit of an effective Breg induction method for therapeutic purposes. In this review we aim to summarize the studies on human Breg and their implication in kidney transplantation and to further discuss the issues surrounding therapeutic applications of this cell subset.
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13
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Wu Z, Xu Q, Qiu X, Jiao Z, Zhang M, Zhong M. FOXP3 rs3761548 polymorphism is associated with tacrolimus-induced acute nephrotoxicity in renal transplant patients. Eur J Clin Pharmacol 2016; 73:39-47. [DOI: 10.1007/s00228-016-2140-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Accepted: 09/27/2016] [Indexed: 11/29/2022]
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14
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Perdigoto AL, Chatenoud L, Bluestone JA, Herold KC. Inducing and Administering Tregs to Treat Human Disease. Front Immunol 2016; 6:654. [PMID: 26834735 PMCID: PMC4722090 DOI: 10.3389/fimmu.2015.00654] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Accepted: 12/21/2015] [Indexed: 12/17/2022] Open
Abstract
Regulatory T cells (Tregs) control unwanted immune responses, including those that mediate tolerance to self as well as to foreign antigens. Their mechanisms of action include direct and indirect effects on effector T cells and important functions in tissue repair and homeostasis. Tregs express a number of cell surface markers and transcriptional factors that have been instrumental in defining their origins and potentially their function. A number of immune therapies, such as rapamycin, IL-2, and anti-T cell antibodies, are able to induce Tregs and are being tested for their efficacy in diverse clinical settings with exciting preliminary results. However, a balance exists with the use of some, such as IL-2, that may have effects on unwanted populations as well as promoting expansion and survival of Tregs requiring careful selection of dose for clinical use. The use of cell surface markers has enabled investigators to isolate and expand ex vivo Tregs more than 500-fold routinely. Clinical trials have begun, administering these expanded Tregs to patients as a means of suppressing autoimmune and alloimmune responses and potentially inducing immune tolerance. Studies in the future are likely to build on these initial technical achievements and use combinations of agents to improve the survival and functional capacity of Tregs.
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Affiliation(s)
- Ana Luisa Perdigoto
- Department of Immunobiology, Yale University, New Haven, CT, USA; Department of Internal Medicine, Yale University, New Haven, CT, USA
| | - Lucienne Chatenoud
- Université Paris Descartes, Sorbonne Paris Cité, F-75475, Paris, France; INSERM U1151, CNRS UMR 8253, Hôpital Necker-Enfants Malades, Paris, France
| | - Jeffrey A Bluestone
- Diabetes Center, University of California San Francisco , San Francisco, CA , USA
| | - Kevan C Herold
- Department of Immunobiology, Yale University, New Haven, CT, USA; Department of Internal Medicine, Yale University, New Haven, CT, USA
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15
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Jungraithmayr W, Brüstle K, Weder W. Harnessing regulatory B cells to prevent experimental obliterative bronchiolitis. J Thorac Cardiovasc Surg 2015; 151:497-8. [PMID: 26520010 DOI: 10.1016/j.jtcvs.2015.09.074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/12/2015] [Accepted: 09/14/2015] [Indexed: 10/23/2022]
Affiliation(s)
| | - Karina Brüstle
- Division of Thoracic Surgery, University Hospital Zurich, Zurich, Switzerland
| | - Walter Weder
- Division of Thoracic Surgery, University Hospital Zurich, Zurich, Switzerland
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