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Huang Q, Zhu J. Regulatory T cell-based therapy in type 1 diabetes: Latest breakthroughs and evidence. Int Immunopharmacol 2024; 140:112724. [PMID: 39098233 DOI: 10.1016/j.intimp.2024.112724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2024] [Revised: 07/10/2024] [Accepted: 07/16/2024] [Indexed: 08/06/2024]
Abstract
Autoimmune diseases (ADs) are among the most significant health complications, with their incidence rising in recent years. Type 1 diabetes (T1D), an AD, targets the insulin-producing β cells in the pancreas, leading to chronic insulin deficiency in genetically susceptible individuals. Regulatory immune cells, particularly T-cells (Tregs), have been shown to play a crucial role in the pathogenesis of diabetes by modulating immune responses. In diabetic patients, Tregs often exhibit diminished effectiveness due to various factors, such as instability in forkhead box P3 (Foxp3) expression or abnormal production of the proinflammatory cytokine interferon-gamma (IFN-γ) by autoreactive T-cells. Consequently, Tregs represent a potential therapeutic target for diabetes treatment. Building on the successful clinical outcomes of chimeric antigen receptor (CAR) T-cell therapy in cancer treatment, particularly in leukemias, the concept of designing and utilizing CAR Tregs for ADs has emerged. This review summarizes the findings on Treg targeting in T1D and discusses the benefits and limitations of this treatment approach for patients suffering from T1D.
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Affiliation(s)
- Qiongxiao Huang
- Center for Reproductive Medicine, Department of Reproductive Endocrinology, Zhejiang Provincial People's Hospital (Affiliated People's Hospital, Hangzhou Medical College), Hangzhou, Zhejiang 310014, China
| | - Jing Zhu
- Center for Reproductive Medicine, Department of Reproductive Endocrinology, Zhejiang Provincial People's Hospital (Affiliated People's Hospital, Hangzhou Medical College), Hangzhou, Zhejiang 310014, China.
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2
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Zhang X, Dong Y, Liu D, Yang L, Xu J, Wang Q. Antigen-specific immunotherapies in type 1 diabetes. J Trace Elem Med Biol 2022; 73:127040. [PMID: 35868165 DOI: 10.1016/j.jtemb.2022.127040] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Revised: 06/18/2022] [Accepted: 07/14/2022] [Indexed: 11/16/2022]
Abstract
Type 1 diabetes mellitus (T1DM) is an autoimmune disease caused by the destruction of pancreatic beta cells, in which immune system disorder plays an important role. Finding a cure for T1DM and restoring beta cell function has been a long-standing goal. Research has shown that immune regulation with pancreatic islet auto-antigens may be the most specific and safe treatment for T1DM. Immunological intervention using diabetogenic auto-antigens as a target can help identify T1DM in high-risk individuals by early screening of autoantibodies (AAbs) before the loss of pancreatic islet function and thus achieve primary prevention of T1DM. However, induction of self-tolerance in patients with pre-diabetes can also slow down the attack of autoimmunity, and achieve secondary prevention. Antigen-based immune therapy opens up new avenues for the prevention and treatment of T1DM. The zinc transporter 8 (ZnT8) protein, presents in the serum of pre-diabetic and diabetic patients, is immunogenic and can cause T1D autoimmune responses. ZnT8 has become a potential target of humoral autoimmunity; it is of great significance for the early diagnosis of T1D. ZnT8-specific CD8+ T cells can be detected in most T1DM patients, and play a key role in the progression of T1D. As an immunotherapy target, it can improve the dysfunction of beta cells in T1DM and provide new ideas for the treatment of T1D. In this review, we summarize research surrounding antigen-specific immunotherapies (ASI) over the past 10 years and the ZnT8 antigen as an autoimmune target to induce self-tolerance for T1DM.
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Affiliation(s)
- Xuejiao Zhang
- Department of Endocrinology, China-Japan Union Hospital of Jilin University, Changchun 130000, China
| | - Ying Dong
- Department of Radiation Oncology, Jilin Cancer Hospital, Changchun 130000, China
| | - Dianyuan Liu
- Department of Endocrinology, China-Japan Union Hospital of Jilin University, Changchun 130000, China
| | - Liu Yang
- Department of Endocrinology, China-Japan Union Hospital of Jilin University, Changchun 130000, China
| | - Jiayi Xu
- School of Public Health, Jilin University, Changchun 130000, China
| | - Qing Wang
- Department of Endocrinology, China-Japan Union Hospital of Jilin University, Changchun 130000, China.
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Okamura T, Hamaguchi M, Tominaga H, Kitagawa N, Hashimoto Y, Majima S, Senmaru T, Okada H, Ushigome E, Nakanishi N, Shichino S, Fukui M. Characterization of Peripheral Blood TCR in Patients with Type 1 Diabetes Mellitus by BD RhapsodyTM VDJ CDR3 Assay. Cells 2022; 11:cells11101623. [PMID: 35626661 PMCID: PMC9139223 DOI: 10.3390/cells11101623] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 05/04/2022] [Accepted: 05/10/2022] [Indexed: 02/05/2023] Open
Abstract
The sequence of complementarity-determining region 3 of the T-cell receptor (TCR) varies widely due to the insertion of random bases during V-(D)-J recombination. In this study, we used single-cell VDJ sequencing using the latest technology, BD Rhapsody, to identify the TCR sequences of autoreactive T-cells characteristic of Japanese type 1 diabetes mellitus (T1DM) and to clarify the pairing of TCR of peripheral blood mononuclear cells from four patients with T1DM at the single-cell level. The expression levels of the TCR alpha variable (TRAV) 17 and TRAV21 in T1DM patients were higher than those in healthy Japanese subjects. Furthermore, the Shannon index of CD8+ T cells and FOXP3+ cells in T1DM patients was lower than that of healthy subjects. The gene expression of PRF1, GZMH, ITGB2, NKG7, CTSW, and CST7 was increased, while the expression of CD4, CD7, CD5, HLA-A, CD27, and IL-32 was decreased in the CD8+ T cells of T1DM patients. The upregulated gene expression was IL4R and TNFRSF4 in FOXP3+ cells of T1DM patients. Overall, these findings demonstrate that TCR diversity and gene expression of CD8+ and FOXP3+ cells are different in patients with T1DM and healthy subjects.
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Affiliation(s)
- Takuro Okamura
- Department of Endocrinology and Metabolism, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (T.O.); (M.H.); (H.T.); (N.K.); (Y.H.); (S.M.); (T.S.); (H.O.); (E.U.); (N.N.)
| | - Masahide Hamaguchi
- Department of Endocrinology and Metabolism, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (T.O.); (M.H.); (H.T.); (N.K.); (Y.H.); (S.M.); (T.S.); (H.O.); (E.U.); (N.N.)
| | - Hiroyuki Tominaga
- Department of Endocrinology and Metabolism, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (T.O.); (M.H.); (H.T.); (N.K.); (Y.H.); (S.M.); (T.S.); (H.O.); (E.U.); (N.N.)
| | - Noriyuki Kitagawa
- Department of Endocrinology and Metabolism, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (T.O.); (M.H.); (H.T.); (N.K.); (Y.H.); (S.M.); (T.S.); (H.O.); (E.U.); (N.N.)
| | - Yoshitaka Hashimoto
- Department of Endocrinology and Metabolism, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (T.O.); (M.H.); (H.T.); (N.K.); (Y.H.); (S.M.); (T.S.); (H.O.); (E.U.); (N.N.)
| | - Saori Majima
- Department of Endocrinology and Metabolism, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (T.O.); (M.H.); (H.T.); (N.K.); (Y.H.); (S.M.); (T.S.); (H.O.); (E.U.); (N.N.)
| | - Takafumi Senmaru
- Department of Endocrinology and Metabolism, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (T.O.); (M.H.); (H.T.); (N.K.); (Y.H.); (S.M.); (T.S.); (H.O.); (E.U.); (N.N.)
| | - Hiroshi Okada
- Department of Endocrinology and Metabolism, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (T.O.); (M.H.); (H.T.); (N.K.); (Y.H.); (S.M.); (T.S.); (H.O.); (E.U.); (N.N.)
| | - Emi Ushigome
- Department of Endocrinology and Metabolism, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (T.O.); (M.H.); (H.T.); (N.K.); (Y.H.); (S.M.); (T.S.); (H.O.); (E.U.); (N.N.)
| | - Naoko Nakanishi
- Department of Endocrinology and Metabolism, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (T.O.); (M.H.); (H.T.); (N.K.); (Y.H.); (S.M.); (T.S.); (H.O.); (E.U.); (N.N.)
| | - Shigeyuki Shichino
- Division of Molecular Regulation of Inflammatory and Immune Diseases, Research Institute of Biomedical Sciences, Tokyo University of Science, Chiba 278-0022, Japan;
| | - Michiaki Fukui
- Department of Endocrinology and Metabolism, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto 602-8566, Japan; (T.O.); (M.H.); (H.T.); (N.K.); (Y.H.); (S.M.); (T.S.); (H.O.); (E.U.); (N.N.)
- Correspondence: ; Tel.: +81-75-251-5505
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Jing Y, Kong Y, McGinty J, Blahnik-Fagan G, Lee T, Orozco-Figueroa S, Bettini ML, James EA, Bettini M. T-Cell Receptor/HLA Humanized Mice Reveal Reduced Tolerance and Increased Immunogenicity of Posttranslationally Modified GAD65 Epitope. Diabetes 2022; 71:1012-1022. [PMID: 35179565 PMCID: PMC9044133 DOI: 10.2337/db21-0993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2021] [Accepted: 02/15/2022] [Indexed: 11/13/2022]
Abstract
Accumulating evidence supports a critical role for posttranslationally modified (PTM) islet neoantigens in type 1 diabetes. However, our understanding regarding thymic development and peripheral activation of PTM autoantigen-reactive T cells is still limited. Using HLA-DR4 humanized mice, we observed that deamidation of GAD65115-127 generates a more immunogenic epitope that recruits T cells with promiscuous recognition of both the deamidated and native epitopes and reduced frequency of regulatory T cells. Using humanized HLA/T-cell receptor (TCR) mice, we observed that TCRs reactive to the native or deamidated GAD65115-127 led to efficient development of CD4+ effector T cells; however, regulatory T-cell development was reduced in mice expressing the PTM-reactive TCR, which was partially restored with exogenous PTM peptide. Upon priming, both the native-specific and the deamidated-specific T cells accumulated in pancreatic islets, suggesting that both specificities can recognize endogenous GAD65 and contribute to anti-β-cell responses. Collectively, our observations in polyclonal and single TCR systems suggest that while effector T-cell responses can exhibit cross-reactivity between native and deamidated GAD65 epitopes, regulatory T-cell development is reduced in response to the deamidated epitope, pointing to regulatory T-cell development as a key mechanism for loss of tolerance to PTM antigenic targets.
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Affiliation(s)
- Yi Jing
- Division of Microbiology and Immunology, Department of Pathology, University of Utah, Salt Lake City, UT
- Section of Diabetes and Endocrinology, Department of Pediatrics, Baylor College of Medicine, Texas Children’s Hospital, Houston, TX
| | - Yuelin Kong
- Section of Diabetes and Endocrinology, Department of Pediatrics, Baylor College of Medicine, Texas Children’s Hospital, Houston, TX
| | - John McGinty
- Benaroya Research Institute at Virginia Mason, Seattle, WA
| | | | - Thomas Lee
- Section of Diabetes and Endocrinology, Department of Pediatrics, Baylor College of Medicine, Texas Children’s Hospital, Houston, TX
| | - Stephanie Orozco-Figueroa
- Division of Microbiology and Immunology, Department of Pathology, University of Utah, Salt Lake City, UT
| | - Matthew L. Bettini
- Division of Microbiology and Immunology, Department of Pathology, University of Utah, Salt Lake City, UT
- Section of Diabetes and Endocrinology, Department of Pediatrics, Baylor College of Medicine, Texas Children’s Hospital, Houston, TX
| | - Eddie A. James
- Benaroya Research Institute at Virginia Mason, Seattle, WA
| | - Maria Bettini
- Division of Microbiology and Immunology, Department of Pathology, University of Utah, Salt Lake City, UT
- Section of Diabetes and Endocrinology, Department of Pediatrics, Baylor College of Medicine, Texas Children’s Hospital, Houston, TX
- Corresponding author: Maria Bettini,
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Yang J, Wen X, Xu H, Torres-Chinn N, Speake C, Greenbaum CJ, Nepom GT, Kwok WW. Antigen-Specific T Cell Analysis Reveals That Active Immune Responses to β Cell Antigens Are Focused on a Unique Set of Epitopes. THE JOURNAL OF IMMUNOLOGY 2017; 199:91-96. [PMID: 28550202 DOI: 10.4049/jimmunol.1601570] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Accepted: 04/29/2017] [Indexed: 11/19/2022]
Abstract
CD38 is an activation marker that is present on recently activated T cells, but absent on resting memory T cells. In this study, we show that CD45RO+CD38+ β cell Ag-specific CD4+ T cells were present at higher frequencies in type 1 diabetes subjects compared with those in healthy subjects. These results imply an ongoing β cell immunity years after onset of diabetes and suggest these activated T cells have an active role in the disease process. The Ag specificities of these activated T cells were determined by a novel CD154 T cell epitope mapping assay. Although each patient usually had a unique set of epitopes recognized by these T cells, two epitopes, DR0401-restricted modified preproinsulin peptide 78-90K88S and zinc transport 8 266-285, were repeatedly identified in multiple subjects. Identifying these T cells and their specific antigenic epitopes might provide immunotherapeutic targets for personalized therapies.
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Affiliation(s)
- Junbao Yang
- Benaroya Research Institute at Virginia Mason, Seattle, WA 98101; and
| | - Xiaomin Wen
- Benaroya Research Institute at Virginia Mason, Seattle, WA 98101; and
| | - Hengyu Xu
- Benaroya Research Institute at Virginia Mason, Seattle, WA 98101; and
| | | | - Cate Speake
- Benaroya Research Institute at Virginia Mason, Seattle, WA 98101; and
| | - Carla J Greenbaum
- Benaroya Research Institute at Virginia Mason, Seattle, WA 98101; and
| | - Gerald T Nepom
- Benaroya Research Institute at Virginia Mason, Seattle, WA 98101; and
| | - William W Kwok
- Benaroya Research Institute at Virginia Mason, Seattle, WA 98101; and .,Department of Medicine, University of Washington, Seattle, WA 98109
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Dastagir SR, Postigo-Fernandez J, Xu C, Stoeckle JH, Firdessa-Fite R, Creusot RJ. Efficient Presentation of Multiple Endogenous Epitopes to Both CD4 + and CD8 + Diabetogenic T Cells for Tolerance. MOLECULAR THERAPY-METHODS & CLINICAL DEVELOPMENT 2016; 4:27-38. [PMID: 28344989 PMCID: PMC5363322 DOI: 10.1016/j.omtm.2016.12.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/01/2016] [Accepted: 12/13/2016] [Indexed: 10/28/2022]
Abstract
Antigen-specific immunotherapy of type 1 diabetes, typically via delivery of a single native β cell antigen, has had little clinical benefit to date. With increasing evidence that diabetogenic T cells react against multiple β cell antigens, including previously unappreciated neo-antigens that can be emulated by mimotopes, a shift from protein- to epitope-based therapy is warranted. To this end, we aimed to achieve efficient co-presentation of multiple major epitopes targeting both CD4+ and CD8+ diabetogenic T cells. We have compared native epitopes versus mimotopes as well as various targeting signals in an effort to optimize recognition by both types of T cells in vitro. Optimal engagement of all T cells was achieved with segregation of CD8 and CD4 epitopes, the latter containing mimotopes and driven by endosome-targeting signals, after delivery into either dendritic or stromal cells. The CD4+ T cell responses elicited by the endogenously delivered epitopes were comparable with high concentrations of soluble peptide and included functional regulatory T cells. This work has important implications for the improvement of antigen-specific therapies using an epitope-based approach to restore tolerance in type 1 diabetes and in a variety of other diseases requiring concomitant targeting of CD4+ and CD8+ T cells.
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Affiliation(s)
- Shamael R Dastagir
- Columbia Center for Translational Immunology and Department of Medicine, Columbia University Medical Center, New York, NY 10032, USA
| | - Jorge Postigo-Fernandez
- Columbia Center for Translational Immunology and Department of Medicine, Columbia University Medical Center, New York, NY 10032, USA
| | - Chunliang Xu
- Columbia Center for Translational Immunology and Department of Medicine, Columbia University Medical Center, New York, NY 10032, USA
| | - James H Stoeckle
- Columbia Center for Translational Immunology and Department of Medicine, Columbia University Medical Center, New York, NY 10032, USA
| | - Rebuma Firdessa-Fite
- Columbia Center for Translational Immunology and Department of Medicine, Columbia University Medical Center, New York, NY 10032, USA
| | - Rémi J Creusot
- Columbia Center for Translational Immunology and Department of Medicine, Columbia University Medical Center, New York, NY 10032, USA
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Liu X, Zhang S, Li X, Zheng P, Hu F, Zhou Z. Vaccination with a co-expression DNA plasmid containing GAD65 fragment gene and IL-10 gene induces regulatory CD4(+) T cells that prevent experimental autoimmune diabetes. Diabetes Metab Res Rev 2016; 32:522-33. [PMID: 26797873 DOI: 10.1002/dmrr.2780] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Revised: 12/11/2015] [Accepted: 01/15/2016] [Indexed: 01/26/2023]
Abstract
BACKGROUND The non-obese diabetic (NOD) mouse is a commonly used animal model for studying type 1 diabetes (T1D). The aims of our study were to explore the diabetes-preventive effect in NOD mice and the potential mechanisms of an optimized co-expression DNA vaccine containing GAD65 fragment gene with the IL-10 gene (SGAD65190-315 /IL-10). METHODS Female NOD mice at the age of 3-4 weeks old were randomly divided into two groups and received intra-muscular injection of either blank pBudCE4.l vector (n = 34) or pBudCE4.l carrying the SGAD65190-315 /IL-10 (n = 32). The incidence of diabetes was monitored up to 30 weeks of age. The severity of insulitis, apoptosis rate of β cells and relevant mechanisms were examined. RESULTS Administration with SGAD65190-315 /IL-10 blocked the onset of autoimmune diabetes in NOD mice, significantly suppressed islet inflammation, inhibited the apoptosis of islet β cells, induced immune tolerance to autoantigen GAD65 and proinsulin and shifted the Th1/Th2 balance towards Th2. More importantly, the frequencies of CD4(+) CD25(+) Foxp3(+) regulatory T cells (Tregs) in the spleen and pancreatic lymph nodes in vaccine-immunized mice were significantly increased, and these Tregs were GAD65-reactive. In addition, Treg depletion by anti-CD25 mAb administration abolished the protective effects of SGAD65190-315 /IL-10 on diabetes and insulitis. Moreover, depletion of CD4(+) CD25(+) T cells using magnetic-activated cell sorting impaired the protective effect of SGAD65190-315 /IL-10 vaccination on adoptive transfer of diabetes. CONCLUSIONS Our data suggested that SGAD65190-315 /IL-10 DNA vaccine had protective effects on T1D by upregulating autoantigen-reactive Tregs. Our findings may provide a novel preventive therapy for T1D. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Xinyuan Liu
- Department of Metabolism and Endocrinology, Second Xiangya Hospital, Central South University, Key Laboratory of Diabetes Immunology, Ministry of Education, National Clinical Research Center for Metabolic Diseases, Changsha, Hunan, China, 410011
| | - Song Zhang
- Department of Metabolism and Endocrinology, Second Xiangya Hospital, Central South University, Key Laboratory of Diabetes Immunology, Ministry of Education, National Clinical Research Center for Metabolic Diseases, Changsha, Hunan, China, 410011
| | - Xia Li
- Department of Metabolism and Endocrinology, Second Xiangya Hospital, Central South University, Key Laboratory of Diabetes Immunology, Ministry of Education, National Clinical Research Center for Metabolic Diseases, Changsha, Hunan, China, 410011
| | - Peilin Zheng
- Department of Metabolism and Endocrinology, Second Xiangya Hospital, Central South University, Key Laboratory of Diabetes Immunology, Ministry of Education, National Clinical Research Center for Metabolic Diseases, Changsha, Hunan, China, 410011
| | - Fang Hu
- Department of Metabolism and Endocrinology, Second Xiangya Hospital, Central South University, Key Laboratory of Diabetes Immunology, Ministry of Education, National Clinical Research Center for Metabolic Diseases, Changsha, Hunan, China, 410011
| | - Zhiguang Zhou
- Department of Metabolism and Endocrinology, Second Xiangya Hospital, Central South University, Key Laboratory of Diabetes Immunology, Ministry of Education, National Clinical Research Center for Metabolic Diseases, Changsha, Hunan, China, 410011
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Akbarpour M, Goudy KS, Cantore A, Russo F, Sanvito F, Naldini L, Annoni A, Roncarolo MG. Insulin B chain 9-23 gene transfer to hepatocytes protects from type 1 diabetes by inducing Ag-specific FoxP3+ Tregs. Sci Transl Med 2016; 7:289ra81. [PMID: 26019217 DOI: 10.1126/scitranslmed.aaa3032] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Antigen (Ag)-specific tolerance in type 1 diabetes (T1D) in human has not been achieved yet. Targeting lentiviral vector (LV)-mediated gene expression to hepatocytes induces active tolerance toward the encoded Ag. The insulin B chain 9-23 (InsB9-23) is an immunodominant T cell epitope in nonobese diabetic (NOD) mice. To determine whether auto-Ag gene transfer to hepatocytes induces tolerance and control of T1D, NOD mice were treated with integrase-competent LVs (ICLVs) that selectively target the expression of InsB9-23 to hepatocytes. ICLV treatment induced InsB9-23-specific effector T cells but also FoxP3(+) regulatory T cells (Tregs), which halted islet immune cell infiltration, and protected from T1D. Moreover, ICLV treatment combined with a single suboptimal dose of anti-CD3 monoclonal antibody (mAb) is effective in T1D reversal. Splenocytes from LV.InsB9-23-treated mice, but not from LV.OVA (ovalbumin)-treated control mice, stopped diabetes development, demonstrating that protection is Ag-specific. Depletion of CD4(+)CD25(+)FoxP3(+) T cells led to diabetes progression, indicating that Ag-specific FoxP3(+) Tregs mediate protection. Integrase-defective LVs (IDLVs).InsB9-23, which alleviate the concerns for insertional mutagenesis and support transient transgene expression in hepatocytes, were also efficient in protecting from T1D. These data demonstrate that hepatocyte-targeted auto-Ag gene expression prevents and resolves T1D and that stable integration of the transgene is not required for this protection. Gene transfer to hepatocytes can be used to induce Ag-specific tolerance in autoimmune diseases.
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Affiliation(s)
- Mahzad Akbarpour
- San Raffaele Telethon Institute for Gene Therapy, Division of Regenerative Medicine, Stem Cells and Gene Therapy, IRCCS San Raffaele Scientific Institute, Milan 20132, Italy. Vita-Salute San Raffaele University, Milan 20132, Italy
| | - Kevin S Goudy
- San Raffaele Telethon Institute for Gene Therapy, Division of Regenerative Medicine, Stem Cells and Gene Therapy, IRCCS San Raffaele Scientific Institute, Milan 20132, Italy
| | - Alessio Cantore
- San Raffaele Telethon Institute for Gene Therapy, Division of Regenerative Medicine, Stem Cells and Gene Therapy, IRCCS San Raffaele Scientific Institute, Milan 20132, Italy
| | - Fabio Russo
- San Raffaele Telethon Institute for Gene Therapy, Division of Regenerative Medicine, Stem Cells and Gene Therapy, IRCCS San Raffaele Scientific Institute, Milan 20132, Italy
| | - Francesca Sanvito
- Pathology Unit, Department of Oncology, IRCCS San Raffaele Scientific Institute, Milan 20132, Italy
| | - Luigi Naldini
- San Raffaele Telethon Institute for Gene Therapy, Division of Regenerative Medicine, Stem Cells and Gene Therapy, IRCCS San Raffaele Scientific Institute, Milan 20132, Italy. Vita-Salute San Raffaele University, Milan 20132, Italy
| | - Andrea Annoni
- San Raffaele Telethon Institute for Gene Therapy, Division of Regenerative Medicine, Stem Cells and Gene Therapy, IRCCS San Raffaele Scientific Institute, Milan 20132, Italy
| | - Maria Grazia Roncarolo
- San Raffaele Telethon Institute for Gene Therapy, Division of Regenerative Medicine, Stem Cells and Gene Therapy, IRCCS San Raffaele Scientific Institute, Milan 20132, Italy. Vita-Salute San Raffaele University, Milan 20132, Italy. Department of Pediatrics, Stanford School of Medicine, Stanford, CA 94305, USA.
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Wan X, Zaghouani H. Antigen-specific therapy against type 1 diabetes: mechanisms and perspectives. Immunotherapy 2014; 6:155-64. [PMID: 24491089 DOI: 10.2217/imt.13.172] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Type 1 diabetes (T1D) is an immune-mediated disease that occurs when the insulin-producing β‑cells of the pancreatic islets are destroyed by an inflammatory process perpetuated by cells of the immune system. The logical approach to suppress T1D is to inactivate or eliminate the lymphocytes responsible for inducing inflammation and targeting the β‑cells. Antigen-specific approaches have been devised and were able to target inflammatory lymphocytes and induce apoptosis or block trafficking to pancreatic islets. Lack of costimulation, expansion of Tregs and bystander suppression are likely mechanisms by which antigen-specific treatments modulate pathogenic T cells. This strategy, however, while prevents the onset of T1D, could not overcome overt T1D, perhaps because of collateral damage to the islet vascular network. Recent developments indicate that donor endothelial stem cell precursors can repair the islets' vascular niche and assist antigen-specific therapy against overt T1D.
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Affiliation(s)
- Xiaoxiao Wan
- Department of Pathology & Immunology. Washington University School of Medicine, St Louis, MO 63110, USA
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10
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Abstract
This paper reviews the presentation of peptides by major histocompatibility complex (MHC) class II molecules in the autoimmune diabetes of the nonobese diabetic (NOD) mouse. Islets of Langerhans contain antigen-presenting cells that capture the proteins and peptides of the beta cells' secretory granules. Peptides bound to I-A(g7), the unique MHC class II molecule of NOD mice, are presented in islets and in pancreatic lymph nodes. The various beta cell-derived peptides interact with selected CD4 T cells to cause inflammation and beta cell demise. Many autoreactive T cells are found in NOD mice, but not all have a major role in the initiation of the autoimmune process. I emphasize here the evidence pointing to insulin autoreactivity as a seminal component in the diabetogenic process.
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Affiliation(s)
- Emil R Unanue
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, Missouri 63110;
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11
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Samten B. CD52 as both a marker and an effector molecule of T cells with regulatory action: Identification of novel regulatory T cells. Cell Mol Immunol 2013; 10:456-8. [PMID: 24037183 DOI: 10.1038/cmi.2013.38] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2013] [Accepted: 07/14/2013] [Indexed: 11/09/2022] Open
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Babad J, Geliebter A, DiLorenzo TP. T-cell autoantigens in the non-obese diabetic mouse model of autoimmune diabetes. Immunology 2010; 131:459-65. [PMID: 21039471 DOI: 10.1111/j.1365-2567.2010.03362.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The non-obese diabetic (NOD) mouse model of autoimmune (type 1) diabetes has contributed greatly to our understanding of disease pathogenesis and has facilitated the development and testing of therapeutic strategies to combat the disease. Although the model is a valuable immunological tool in its own right, it reaches its fullest potential in areas where its findings translate to the human disease. Perhaps the foremost example of this is the field of T-cell antigen discovery, from which diverse benefits can be derived, including the development of antigen-specific disease interventions. The majority of NOD T-cell antigens are also targets of T-cell autoimmunity in patients with type 1 diabetes, and several of these are currently being evaluated in clinical trials. Here we review the journeys of these antigens from bench to bedside. We also discuss several recently identified NOD T-cell autoantigens whose translational potential warrants further investigation.
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Affiliation(s)
- Jeffrey Babad
- Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, NY 10461, USA
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Lin M, Stoica-Nazarov C, Surls J, Kehl M, Bona C, Olsen C, Brumeanu TD, Casares S. Reversal of type 1 diabetes by a new MHC II-peptide chimera: “Single-epitope-mediated suppression” to stabilize a polyclonal autoimmune T-cell process. Eur J Immunol 2010; 40:2277-88. [DOI: 10.1002/eji.200940094] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Stadinski B, Kappler J, Eisenbarth GS. Molecular targeting of islet autoantigens. Immunity 2010; 32:446-56. [PMID: 20412755 DOI: 10.1016/j.immuni.2010.04.008] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2010] [Revised: 04/02/2010] [Accepted: 04/05/2010] [Indexed: 12/11/2022]
Abstract
Type 1 diabetes of man and animal models results from immune-mediated specific beta cell destruction. Multiple islet antigens are targets of autoimmunity and most of these are not beta cell specific. Immune responses to insulin appear to be essential for the development of diabetes of the NOD mouse. In this review, we will emphasize the unusual manner in which selected autoantigenic peptides (particularly the recently discovered target of BDC2.5 T cells [chromagranin A]) are presented and recognized by autoreactive CD4(+) T cell receptors. We hypothesize that "unusual" structural interactions of specific trimolecular complexes (MHC class II, peptide, and T cell receptors) are fundamental to the escape from the thymus of autoreactive T cells able to cause type 1 diabetes.
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Öling V, Geubtner K, Ilonen J, Reijonen H. A low antigen dose selectively promotes expansion of high-avidity autoreactive T cells with distinct phenotypic characteristics: A study of human autoreactive CD4+T cells specific for GAD65. Autoimmunity 2010; 43:573-82. [DOI: 10.3109/08916930903540424] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Chen C, Liu CP. Regulatory function of a novel population of mouse autoantigen-specific Foxp3 regulatory T cells depends on IFN-gamma, NO, and contact with target cells. PLoS One 2009; 4:e7863. [PMID: 19924236 PMCID: PMC2773411 DOI: 10.1371/journal.pone.0007863] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2009] [Accepted: 10/22/2009] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Both naturally arising Foxp3(+) and antigen-induced Foxp3(-) regulatory T cells (Treg) play a critical role in regulating immune responses, as well as in preventing autoimmune diseases and graft rejection. It is known that antigen-specific Treg are more potent than polyclonal Treg in suppressing pathogenic immune responses that cause autoimmunity and inflammation. However, difficulty in identifying and isolating a sufficient number of antigen-specific Treg has limited their use in research to elucidate the mechanisms underlying their regulatory function and their potential role in therapy. METHODOLOGY/PRINCIPAL FINDINGS Using a novel class II MHC tetramer, we have isolated a population of CD4(+) Foxp3(-) T cells specific for the autoantigen glutamic acid decarboxylase p286-300 peptide (NR286 T cells) from diabetes-resistant non-obese resistant (NOR) mice. These Foxp3(-) NR286 T cells functioned as Treg that were able to suppress target T cell proliferation in vitro and inhibit type 1 diabetes in animals. Unexpected results from mechanistic studies in vitro showed that their regulatory function was dependent on not only IFN-gamma and nitric oxide, but also on cell contact with target cells. In addition, separating NR286 Treg from target T cells in transwell assays abolished both production of NO and suppression of target T cells, regardless of whether IFN-gamma was produced in cell cultures. Therefore, production of NO, not IFN-gamma, was cell contact dependent, suggesting that NO may function downstream of IFN-gamma in mediating regulatory function of NR286 Treg. CONCLUSIONS/SIGNIFICANCE These studies identified a unique population of autoantigen-specific Foxp3(-) Treg that can exert their regulatory function dependent on not only IFN-gamma and NO but also cell contact with target cells.
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Affiliation(s)
- Cyndi Chen
- Department of Immunology, Beckman Research Institute, City of Hope, Duarte, California, United States of America
| | - Chih-Pin Liu
- Department of Immunology, Beckman Research Institute, City of Hope, Duarte, California, United States of America
- Department of Diabetes, Endocrinology, and Metabolism, Beckman Research Institute, City of Hope, Duarte, California, United States of America
- * E-mail:
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Glutamic acid decarboxylase-derived epitopes with specific domains expand CD4(+)CD25(+) regulatory T cells. PLoS One 2009; 4:e7034. [PMID: 19759824 PMCID: PMC2736381 DOI: 10.1371/journal.pone.0007034] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2009] [Accepted: 08/11/2009] [Indexed: 01/24/2023] Open
Abstract
Background CD4+CD25+ regulatory T cell (Treg)-based immunotherapy is considered a promising regimen for controlling the progression of autoimmune diabetes. In this study, we tested the hypothesis that the therapeutic effects of Tregs in response to the antigenic epitope stimulation depend on the structural properties of the epitopes used. Methodology/Principal Findings Splenic lymphocytes from nonobese diabetic (NOD) mice were stimulated with different glutamic acid decarboxylase (GAD)-derived epitopes for 7–10 days and the frequency and function of Tregs was analyzed. We found that, although all expanded Tregs showed suppressive functions in vitro, only p524 (GAD524–538)-expanded CD4+CD25+ T cells inhibited diabetes development in the co-transfer models, while p509 (GAD509–528)- or p530 (GAD530–543)-expanded CD4+CD25+ T cells had no such effects. Using computer-guided molecular modeling and docking methods, the differences in structural characteristics of these epitopes and the interaction mode (including binding energy and identified domains in the epitopes) between the above-mentioned epitopes and MHC class II I-Ag7 were analyzed. The theoretical results showed that the epitope p524, which induced protective Tregs, possessed negative surface-electrostatic potential and bound two chains of MHC class II I-Ag7, while the epitopes p509 and p530 which had no such ability exhibited positive surface-electrostatic potential and bound one chain of I-Ag7. Furthermore, p524 bound to I-Ag7 more stably than p509 and p530. Of importance, we hypothesized and subsequently confirmed experimentally that the epitope (GAD570–585, p570), which displayed similar characteristics to p524, was a protective epitope by showing that p570-expanded CD4+CD25+ T cells suppressed the onset of diabetes in NOD mice. Conclusions/Significance These data suggest that molecular modeling-based structural analysis of epitopes may be an instrumental tool for prediction of protective epitopes to expand functional Tregs.
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Abstract
Type 1 diabetes (T1D) is a T cell-mediated autoimmune disease in which the insulin producing beta cells are destroyed. Antigen-based immunotherapy provides an approach to selectively tolerize pathogenic beta cell-specific T cells, while leaving the remainder of the immune system intact. In this article, we discuss our group's experience in defining the parameters that impact the efficacy of beta cell antigen "vaccination" for the prevention and treatment of T1D.
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Induction of anti-whole GAD65 reactivity in vivo results in disease suppression in type 1 diabetes. J Autoimmun 2009; 32:104-9. [DOI: 10.1016/j.jaut.2009.01.001] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2008] [Revised: 12/16/2008] [Accepted: 01/02/2009] [Indexed: 11/19/2022]
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Stenard F, Nguyen C, Cox K, Kambham N, Umetsu DT, Krams SM, Esquivel CO, Martinez OM. Decreases in circulating CD4+CD25hiFOXP3+ cells and increases in intragraft FOXP3+ cells accompany allograft rejection in pediatric liver allograft recipients. Pediatr Transplant 2009; 13:70-80. [PMID: 18331536 DOI: 10.1111/j.1399-3046.2008.00917.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
We examined CD4(+)CD25(hi)FOXP3(+) cells Treg in children following liver transplantation and determined the relationship between Treg cell levels in the blood and in the graft. Peripheral blood was obtained from pediatric liver transplant patients at sequential time points: pre-transplant, one month, 3-4 months, 6-7 months, and 11-12 months post-transplant. PBMC were isolated, labeled for CD4, CD25 and FOXP3 expression and analyzed by flow cytometry for CD4(+)CD25(hi)FOXP3(+) cells. Sorted CD4(+)CD25(hi) cells were assessed for functional activity. Pretransplant blood levels of CD4(+)CD25(hi)FOXP3(+) Treg cells were not significantly different from post-transplant blood levels of CD4(+)CD25(hi)FOXP3(+) Treg cells. However, the blood levels of CD4(+)CD25(hi)FOXP3(+) Treg cells were significantly decreased during acute rejection compared with levels when graft function was stable. Immunohistochemistry revealed that FOXP3(+) cells were increased in the portal region of livers with histopathologic evidence of acute graft rejection compared with livers without evidence of rejection and were localized primarily within the inflammatory infiltrate. These data indicate that Treg cells are found at the site of allograft rejection and may play a role in regulation of alloreactivity. Moreover, monitoring peripheral CD4(+)CD25(hi)FOXP3(+) Treg cell levels may be useful in improving the post-transplant management of pediatric liver allograft recipients.
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Affiliation(s)
- Fabien Stenard
- Division of Transplantation, Department of Surgery, Stanford University School of Medicine, Stanford, CA 94305-5492, USA
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Buenafe AC, Sherwood C, Moes N, Jones RE. Recombinase-activating gene 1-associated expression of the myelin basic protein 1-11-specific transgenic T-cell receptor in H-2b mice. J Neurosci Res 2008; 87:42-9. [PMID: 18752298 DOI: 10.1002/jnr.21839] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
We pursued a breeding strategy intended to generate disease-resistant mice with exclusive expression of the H-2(u)-restricted myelin basic protein (MBP) 1-11 peptide-specific transgenic (Tg) T-cell receptor (TCR) on the T-cell-deficient RAG1KO (H-2(b)) background. Utilizing specific screening assays for the offspring, analyses of the F1 intercross and subsequent crosses revealed that the TgTCR-associated clonotypic marker detected by the 3H12 mAb could be found only in association with the H-2(b) homozygous background in offspring possessing a functional rag1 gene. Moreover, expression of the MBP-specific TgTCR could not be found in H-2(b) homozygous offspring that were RAG1 deficient (rag1(-/-)). PCR analysis of genomic DNA from these 3H12-negative offspring verified the presence of the TCR transgenes. Thus, the presence of a functional rag1 gene was required for the expression of the MBP-specific TgTCR on the H-2(b) background. Given the role for RAG1, the results have important implications for T-cell repertoire development.
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Affiliation(s)
- Abigail C Buenafe
- Department of Neurology, Oregon Health and Science University, Portland, Oregon 97239, USA.
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Abstract
OBJECTIVE It is well established that the primary mediators of beta-cell destruction in type 1 diabetes are T-cells. Nevertheless, the molecular basis for recognition of beta-cell-specific epitopes by pathogenic T-cells remains ill defined; we seek to further explore this issue. RESEARCH DESIGN AND METHODS To determine the properties of beta-cell-specific T-cell receptors (TCRs), we characterized the fine specificity, functional and relative binding avidity/affinity, and diabetogenicity of a panel of GAD65-specific CD4(+) T-cell clones established from unimmunized 4- and 14-week-old NOD female mice. RESULTS The majority of GAD65-specific CD4(+) T-cells isolated from 4- and 14-week-old NOD female mice were specific for peptides spanning amino acids 217-236 (p217) and 290-309 (p290). Surprisingly, 31% of the T-cell clones prepared from 14-week-old but not younger NOD mice were stimulated with both p217 and p290. These promiscuous T-cell clones recognized the two epitopes when naturally processed and presented, and this dual specificity was mediated by a single TCR. Furthermore, promiscuous T-cell clones demonstrated increased functional avidity and relative TCR binding affinity, which correlated with enhanced islet infiltration on adoptive transfer compared with that of monospecific T-cell clones. CONCLUSIONS These results indicate that promiscuous recognition contributes to the development of GAD65-specific CD4(+) T-cell clones in NOD mice. Furthermore, these findings suggest that T-cell promiscuity reflects a novel form of T-cell avidity maturation.
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Affiliation(s)
- Li Li
- Department of Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
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Wang B, Tisch R. Parameters influencing antigen-specific immunotherapy for type 1 diabetes. Immunol Res 2008; 41:175-87. [DOI: 10.1007/s12026-008-8020-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Burton AR, Vincent E, Arnold PY, Lennon GP, Smeltzer M, Li CS, Haskins K, Hutton J, Tisch RM, Sercarz EE, Santamaria P, Workman CJ, Vignali DAA. On the pathogenicity of autoantigen-specific T-cell receptors. Diabetes 2008; 57:1321-30. [PMID: 18299317 DOI: 10.2337/db07-1129] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE Type 1 diabetes is mediated by T-cell entry into pancreatic islets and destruction of insulin-producing beta-cells. The relative contribution of T-cells specific for different autoantigens is largely unknown because relatively few have been assessed in vivo. RESEARCH DESIGN AND METHODS We generated mice possessing a monoclonal population of T-cells expressing 1 of 17 T-cell receptors (TCR) specific for either known autoantigens (GAD65, insulinoma-associated protein 2 (IA2), IA2beta/phogrin, and insulin), unknown islet antigens, or control antigens on a NOD.scid background using retroviral-mediated stem cell gene transfer and 2A-linked multicistronic retroviral vectors (referred to herein as retrogenic [Rg] mice). The TCR Rg approach provides a mechanism by which T-cells with broad phenotypic differences can be directly compared. RESULTS Neither GAD- nor IA2-specific TCRs mediated T-cell islet infiltration or diabetes even though T-cells developed in these Rg mice and responded to their cognate epitope. IA2beta/phogrin and insulin-specific Rg T-cells produced variable levels of insulitis, with one TCR producing delayed diabetes. Three TCRs specific for unknown islet antigens produced a hierarchy of insulitogenic and diabetogenic potential (BDC-2.5 > NY4.1 > BDC-6.9), while a fourth (BDC-10.1) mediated dramatically accelerated disease, with all mice diabetic by day 33, well before full T-cell reconstitution (days 42-56). Remarkably, as few as 1,000 BDC-10.1 Rg T-cells caused rapid diabetes following adoptive transfer into NOD.scid mice. CONCLUSIONS; Our data show that relatively few autoantigen-specific TCRs can mediate islet infiltration and beta-cell destruction on their own and that autoreactivity does not necessarily imply pathogenicity.
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Affiliation(s)
- Amanda R Burton
- Department of Immunology, St. Jude Children's Research Hospital, 332 N. Lauderdale, Memphis, TN 38105-2794, USA
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Gebe JA, Unrath KA, Yue BB, Miyake T, Falk BA, Nepom GT. Autoreactive human T-cell receptor initiates insulitis and impaired glucose tolerance in HLA DR4 transgenic mice. J Autoimmun 2007; 30:197-206. [PMID: 17949947 DOI: 10.1016/j.jaut.2007.08.001] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2007] [Revised: 08/21/2007] [Accepted: 08/22/2007] [Indexed: 02/09/2023]
Abstract
A human T-cell receptor (TcR) derived from an autoreactive T-cell specific for GAD65, from a subject at high risk for autoimmune diabetes, was introduced into HLA-DR4 transgenic mice. The source of TcR was a CD4(+) T(H)1(+) T-cell clone which responded to an immunodominant epitope of the human islet protein GAD65, an epitope shared with both GAD65 and GAD67 in the mouse. The resulting HLA-DR4/GAD-TcR transgenic mice on a Rag2(o/o)/I-Ab(o/o)/B6 background exhibited a CD4(+) infiltrate into pancreatic islets that correlated with a loss of insulin in infiltrated islets. These mice also exhibited a subclinical impaired tolerance to exogenously fed glucose as assayed by an intraperitoneal glucose tolerance test. T cells containing the GAD65/67 (555-567) responsive TcR undergo strong negative selection as evidenced by a 10-fold lower thymocyte cellularity compared to non-TcR transgenic mice, and clonotype peripheral T cells represented approximately 1% of CD4(+) T cells in Rag2 sufficient mice. Upon in vitro stimulation, GAD65/67 555-567 responsive T cells secrete interferon-gamma, minimal interleukin (IL)-2 and tumor necrosis factor-alpha, and no IL-4, IL-5, IL-10, or IL-17, consistent with a T(H)1 profile. These data demonstrate that CD4(+) T cells specific for a naturally processed epitope within GAD can specifically home to pancreatic islets and lead to impaired islet beta-cell function in diabetes-associated HLA-DR4 transgenic mice on the relatively non-autoimmune C57BL/6 background. The relatively slow progression and patchy insulitis are reminiscent of the chronic pre-clinical phase similar to a majority of human at-risk subjects, and models these indolent features of human T1D.
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Affiliation(s)
- John A Gebe
- Department of Diabetes, Benaroya Research Institute, 1201 Ninth Avenue, Seattle, WA 98101, USA.
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Blancou P, Mallone R, Martinuzzi E, Sévère S, Pogu S, Novelli G, Bruno G, Charbonnel B, Dolz M, Chaillous L, van Endert P, Bach JM. Immunization of HLA Class I Transgenic Mice Identifies Autoantigenic Epitopes Eliciting Dominant Responses in Type 1 Diabetes Patients. THE JOURNAL OF IMMUNOLOGY 2007; 178:7458-66. [PMID: 17513797 DOI: 10.4049/jimmunol.178.11.7458] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Type 1 diabetes (T1D) results from the autoimmune destruction of pancreatic beta cells. CD8(+) T cells have recently been assigned a major role in beta cell injury. Consequently, the identification of autoreactive CD8(+) T cells in humans remains essential for development of therapeutic strategies and of assays to identify aggressive cells. However, this identification is laborious and limited by quantities of human blood samples available. We propose a rapid and reliable method to identify autoantigen-derived epitopes recognized by human CD8(+) T lymphocytes in T1D patients. Human histocompatibility leukocyte Ags-A*0201 (HLA-A*0201) transgenic mice were immunized with plasmids encoding the T1D-associated autoantigens: 65 kDa glutamic acid decarboxylase (GAD) or insulinoma-associated protein 2 (IA-2). Candidate epitopes for T1D were selected from peptide libraries by testing the CD8(+) reactivity of vaccinated mice. All of the nine-candidate epitopes (five for GAD and four for IA-2) identified by our experimental approach were specifically recognized by CD8(+) T cells from newly diagnosed T1D patients (n = 19) but not from CD8(+) T cells of healthy controls (n = 20). Among these, GAD(114-123), GAD(536-545) and IA-2(805-813) were recognized by 53%, 25%, and 42% of T1D patients, respectively.
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Affiliation(s)
- Philippe Blancou
- Immuno-Endocrinology Unité Mixte de Recherche 707, Institut National de la Recherche Agronomique/Ecole Nationale Vétérinaire de Nantes/Université, Nantes, France
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Di Lorenzo TP, Peakman M, Roep BO. Translational mini-review series on type 1 diabetes: Systematic analysis of T cell epitopes in autoimmune diabetes. Clin Exp Immunol 2007; 148:1-16. [PMID: 17349009 PMCID: PMC1868845 DOI: 10.1111/j.1365-2249.2006.03244.x] [Citation(s) in RCA: 218] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
T cell epitopes represent the molecular code words through which the adaptive immune system communicates. In the context of a T cell-mediated autoimmune disease such as type 1 diabetes, CD4 and CD8 T cell recognition of islet autoantigenic epitopes is a key step in the autoimmune cascade. Epitope recognition takes place during the generation of tolerance, during its loss as the disease process is initiated, and during epitope spreading as islet cell damage is perpetuated. Epitope recognition is also a potentially critical element in therapeutic interventions such as antigen-specific immunotherapy. T cell epitope discovery, therefore, is an important component of type 1 diabetes research, in both human and murine models. With this in mind, in this review we present a comprehensive guide to epitopes that have been identified as T cell targets in autoimmune diabetes. Targets of both CD4 and CD8 T cells are listed for human type 1 diabetes, for humanized [human leucocyte antigen (HLA)-transgenic] mouse models, and for the major spontaneous disease model, the non-obese diabetic (NOD) mouse. Importantly, for each epitope we provide an analysis of the relative stringency with which it has been identified, including whether recognition is spontaneous or induced and whether there is evidence that the epitope is generated from the native protein by natural antigen processing. This analysis provides an important resource for investigating diabetes pathogenesis, for developing antigen-specific therapies, and for developing strategies for T cell monitoring during disease development and therapeutic intervention.
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Affiliation(s)
- T P Di Lorenzo
- Department of Microbiology and Immunology, Albert Einstein College of Medicine, Bronx, NY, USA.
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Gebe JA, Falk B, Unrath K, Nepom GT. Autoreactive T cells in a partially humanized murine model of T1D. Ann N Y Acad Sci 2007; 1103:69-76. [PMID: 17376837 DOI: 10.1196/annals.1394.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Glutamic acid decarboxylase (GAD65) and insulin are implicated as target antigens in the pathogenesis of human diabetes through correlative measurements of humoral and cellular reactivity to them in diabetics and at-risk diabetic individuals. Recently, an age-dependent loss of tolerance to one of several naturally processed epitopes of GAD65 (555-567) has been observed to precede diabetes in diabetes-prone mice transgenic for diabetes-correlated human class II genes. Extended studies in these mice (RIP-B7/DR0404) now show that tolerance is maintained to another DR4-restricted naturally processed region within GAD65. While tolerance is lost to GAD65 (555-567) in B7/DR0404 mice prior to diabetes, these mice remain T cell-tolerant to GAD65 (273-286). Prediabetes loss of tolerance to GAD65 (555-567) has now been shown to correlate with an impaired response to exogenous glucose in an intraperitoneal (i.p.) glucose tolerance test. In addition, these mice exhibit a T cell response to insulin A(6-21) at the hyperglycemic state. Investigating a possible cause-and-effect relationship between T cell reactivity to GAD65 and diabetes pathogenesis, GAD65 (555-567) T cell receptor (TcR) transgenic mice have been generated and future work is aimed at understanding the importance of T cell GAD65 reactivity and its role in diabetes progression.
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Affiliation(s)
- John A Gebe
- Department of Immunology, Benaroya Research Institute at Virginia Mason, 1201 9th Ave. Seattle, WA 98101, USA.
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Gebe JA, Unrath KA, Falk BA, Ito K, Wen L, Daniels TL, Lernmark A, Nepom GT. Age-dependent loss of tolerance to an immunodominant epitope of glutamic acid decarboxylase in diabetic-prone RIP-B7/DR4 mice. Clin Immunol 2006; 121:294-304. [PMID: 16979383 PMCID: PMC1850983 DOI: 10.1016/j.clim.2006.08.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2006] [Revised: 08/03/2006] [Accepted: 08/04/2006] [Indexed: 10/24/2022]
Abstract
We have identified for the first time an age-dependent spontaneous loss of tolerance to two self-antigenic epitopes derived from putative diabetes-associated antigens glutamic acid decarboxylase (GAD65) and glial fibrillary acidic protein (GFAP) in RIP-B7/DRB1*0404 HLA transgenic mice. Diabetic and older non-diabetic mice exhibited a proliferative response to an immunodominant epitope from GAD65 (555-567) and also from GFAP (240-252) but not from an immunogenic epitope from diabetes-associated islet-specific glucose-6-phosphatase catalytic subunit-related protein. The response to both of these self-antigens is not observed in young mice but is observed in older non-diabetic mice and is accompanied by histological evidence of insulitis in the absence of overt diabetes. Islet infiltrates in older non-diabetic mice and diabetic mice contain CD4(+)/FoxP3(+) cells and suggest the presence of a regulatory mechanism prior and during diabetic disease. Diabetes penetrance in RIP-B7/DR0404 mice is 23% with a mean onset age of 40 weeks and is similar to that reported for RIP-B7/DR0401 mice. A gender preference is observed in that 38% of female mice become diabetic compared to 8% of male mice.
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Affiliation(s)
- John A Gebe
- Department of Immunology, Benaroya Research Institute at Virginia Mason, 1201 9th Avenue, Seattle WA 98101, USA.
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Abstract
T1DM (Type I diabetes mellitus) results from selective destruction of the insulin-producing beta-cells of the pancreas by the immune system, and is characterized by hyperglycaemia and vascular complications arising from suboptimal control of blood glucose levels. The discovery of animal models of T1DM in the late 1970s and early 1980s, particularly the NOD (non-obese diabetic) mouse and the BB (BioBreeding) diabetes-prone rat, had a fundamental impact on our ability to understand the genetics, aetiology and pathogenesis of this disease. NOD and BB diabetes-prone rats spontaneously develop a form of diabetes that closely resembles the human counterpart. Early studies of these animals quickly led to the realization that T1DM is caused by autoreactive T-lymphocytes and revealed that the development of T1DM is controlled by numerous polymorphic genetic elements that are scattered throughout the genome. The development of transgenic and gene-targeting technologies during the 1980s allowed the generation of models of T1DM of reduced genetic and pathogenic complexity, and a more detailed understanding of the immunogenetics of T1DM. In this review, we summarize the contribution of studies in animal models of T1DM to our current understanding of four fundamental aspects of T1DM: (i) the nature of genetic elements affording T1DM susceptibility or resistance; (ii) the mechanisms underlying the development and recruitment of pathogenic autoreactive T-cells; (iii) the identity of islet antigens that contribute to the initiation and/or progression of islet inflammation and beta-cell destruction; and (iv) the design of avenues for therapeutic intervention that are rooted in the knowledge gained from studies of animal models. Development of new animal models will ensure continued progress in these four areas.
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Affiliation(s)
- Yang Yang
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, University of Calgary, 3330 Hospital Drive N.W., Calgary, Alberta, Canada T2N 4N1
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Abstract
Naturally occurring, CD4+ CD25+ regulatory T cells that are exported from the thymus early in life play an important role in controlling organ-specific autoimmune diseases, but they may not be critical for suppressing systemic autoimmunity in lupus. On the other hand, lupus-prone subjects appear to be deficient in generation of adaptive T-regulatory cells that can be induced by various means. We review autoantigen-specific therapeutic approaches that induce such regulatory T cells. Of particular interest are TGF-ss producing CD4+ CD25+ and CD8+ regulatory T cells that are induced by low dose tolerance therapy of lupus-prone mice with nucleosomal histone peptide epitopes, administered subcutaneously in subnanomolar doses. These regulatory T cells are not only efficient in suppressing autoantigen recognition and autoantibody production, but they also inhibit migration/accumulation of pathogenic autoimmune cells in the target organ, such as the kidneys of mice prone to develop lupus nephritis. We discuss why and under what conditions such therapeutic approaches would be beneficial in lupus patients and lupus-prone subjects.
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Affiliation(s)
- Hee-Kap Kang
- Division of Rheumatology, Departments of Medicine and Microbiology-Immunology, Northwestern University Feinberg School of Medicine, Chicago, Illinois 60611, USA
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33
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Jasinski JM, Yu L, Nakayama M, Li MM, Lipes MA, Eisenbarth GS, Liu E. Transgenic insulin (B:9-23) T-cell receptor mice develop autoimmune diabetes dependent upon RAG genotype, H-2g7 homozygosity, and insulin 2 gene knockout. Diabetes 2006; 55:1978-84. [PMID: 16804066 DOI: 10.2337/db06-0058] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
A series of recent studies in humans and the NOD mouse model have highlighted the central role that autoimmunity directed against insulin, in particular the insulin B chain 9-23 peptide, may play in the pathogenesis of type 1 diabetes. Both pathogenic and protective T-cell clones recognizing the B:9-23 peptide have been produced. This report describes the successful creation of BDC12-4.1 T-cell receptor (TCR) transgenic mice with spontaneous insulitis in F1 mice (FVB x NOD) and spontaneous diabetes in NOD.RAG(-/-) (backcross 1 generation). Disease progression is heterogeneous and is modified by a series of genetic factors including heterozygosity (H-2(g7)/H-2(q)) versus homozygosity for H-2(g7), the presence of additional T-/B-cell receptor-rearranged genes (RAG(+) versus RAG(-/-)), and the insulin 2 gene knockout (the insulin gene expressed in the NOD thymus). Despite lymphopenia, 40% of H-2(g7/g7) BDC12-4.1 TCR(+) RAG(-/-) Ins2(-/-) mice are diabetic by 10 weeks of age. As few as 13,500 transgenic T-cells from a diabetic TCR(+) RAG(-/-) mouse can transfer diabetes to an NOD.scid mouse. The current study demonstrates that the BDC12-4.1 TCR is sufficient to cause diabetes at NOD backcross 1, bypassing polygenic inhibition of insulitis and diabetogenesis.
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MESH Headings
- Adoptive Transfer
- Animals
- CD4-Positive T-Lymphocytes/immunology
- CD8-Positive T-Lymphocytes/immunology
- Crosses, Genetic
- Diabetes Mellitus/genetics
- Diabetes Mellitus/immunology
- Diabetes Mellitus, Type 1/genetics
- Female
- Genes, RAG-1
- Heterozygote
- Insulin/genetics
- Interferon-gamma/blood
- Male
- Mice
- Mice, Inbred NOD
- Mice, Knockout
- Mice, Transgenic
- Receptors, Antigen, T-Cell/deficiency
- Receptors, Antigen, T-Cell/genetics
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Affiliation(s)
- Jean M Jasinski
- Barbara Davis Center for Childhood Diabetes, University of Colorado Health Sciences Center, P.O. Box 6511, MS B140, Aurora, CO 80045-6511, USA
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34
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Du W, Wong FS, Li MO, Peng J, Qi H, Flavell RA, Sherwin R, Wen L. TGF-beta signaling is required for the function of insulin-reactive T regulatory cells. J Clin Invest 2006; 116:1360-70. [PMID: 16670772 PMCID: PMC1451206 DOI: 10.1172/jci27030] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2005] [Accepted: 01/24/2006] [Indexed: 01/09/2023] Open
Abstract
We have previously isolated insulin-reactive Tregs from diabetic NOD mice designated 2H6, from which TCR transgenic mice were generated. The T cells from these 2H6 transgenic mice recognize insulin but have suppressive properties in vitro. They protect NOD mice in vivo from spontaneous development of diabetes and adoptive transfer of disease caused by polyclonal diabetogenic spleen cells as well as the highly diabetogenic monoclonal BDC2.5 TCR transgenic T cells that recognize an islet granule antigen. Using cells from both NOD and BDC2.5 mice that express a dominant-negative TGF-beta receptor type II (TGF-betaDNRII), we show that 2H6 T cells protected from disease by producing TGF-beta and that the ability of the target diabetogenic T cells to respond to TGF-beta was crucial. We further demonstrate that TGF-beta signaling in 2H6 cells was important for their protective properties, as 2H6 cells were unable to protect from adoptive transfer-induced diabetes if they were unable to respond to TGF-beta. Thus, our data demonstrate that insulin-specific regulatory cells protect from diabetes by virtue of their production of TGF-beta1 that acts in an autocrine manner to maintain their regulatory function and acts in a paracrine manner on the target cells.
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Affiliation(s)
- Wei Du
- Section of Endocrinology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Cellular and Molecular Medicine, School of Medical Sciences, University of Bristol, Bristol, United Kingdom.
Section of Immunobiology and Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, Connecticut, USA
| | - F. Susan Wong
- Section of Endocrinology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Cellular and Molecular Medicine, School of Medical Sciences, University of Bristol, Bristol, United Kingdom.
Section of Immunobiology and Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Ming O. Li
- Section of Endocrinology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Cellular and Molecular Medicine, School of Medical Sciences, University of Bristol, Bristol, United Kingdom.
Section of Immunobiology and Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Jian Peng
- Section of Endocrinology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Cellular and Molecular Medicine, School of Medical Sciences, University of Bristol, Bristol, United Kingdom.
Section of Immunobiology and Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Hao Qi
- Section of Endocrinology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Cellular and Molecular Medicine, School of Medical Sciences, University of Bristol, Bristol, United Kingdom.
Section of Immunobiology and Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Richard A. Flavell
- Section of Endocrinology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Cellular and Molecular Medicine, School of Medical Sciences, University of Bristol, Bristol, United Kingdom.
Section of Immunobiology and Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Robert Sherwin
- Section of Endocrinology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Cellular and Molecular Medicine, School of Medical Sciences, University of Bristol, Bristol, United Kingdom.
Section of Immunobiology and Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, Connecticut, USA
| | - Li Wen
- Section of Endocrinology, Yale University School of Medicine, New Haven, Connecticut, USA.
Department of Cellular and Molecular Medicine, School of Medical Sciences, University of Bristol, Bristol, United Kingdom.
Section of Immunobiology and Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, Connecticut, USA
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35
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Jaeckel E, Kretschmer K, Apostolou I, von Boehmer H. Instruction of Treg commitment in peripheral T cells is suited to reverse autoimmunity. Semin Immunol 2006; 18:89-92. [PMID: 16473523 DOI: 10.1016/j.smim.2006.01.011] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
In order to exploit regulatory T cells in a clinical setting it is desirable to be able to generate such cells by a variety of antigens that elicit unwanted immune responses. This goal has been achieved by targeting antigen to dendritic cells under subimmunogenic conditions which results in the conversion of naïve Foxp3 negative T cells into Foxp3-expressing regulatory T cells that are indistinguishable from what has been referred to as natural Treg. Such cells have the ability to interfere with immunity at early as well as late stages of the immune response during which effector cells have already been formed. This suggests that Treg cannot only be exploited to prevent immune responses but also to interfere with already established immunity.
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Affiliation(s)
- Elmar Jaeckel
- Harvard Medical School, Dana-Farber Cancer Institute, 44 Binney Street, Boston, MA 02115, USA
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36
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Kawachi I, Maldonado J, Strader C, Gilfillan S. MR1-restricted V alpha 19i mucosal-associated invariant T cells are innate T cells in the gut lamina propria that provide a rapid and diverse cytokine response. THE JOURNAL OF IMMUNOLOGY 2006; 176:1618-27. [PMID: 16424191 DOI: 10.4049/jimmunol.176.3.1618] [Citation(s) in RCA: 141] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Mucosal-associated invariant T (MAIT) cells reside primarily in the gut lamina propria and require commensal flora for selection/expansion. They are restricted by the highly conserved MHC class I-related molecule MR1 and, like most NK T cells, express an invariant TCRalpha chain. Although they probably contribute to gut immunity, MAIT cells have not been functionally characterized because they are so rare. To create a model in which they are more abundant, we generated transgenic mice expressing only the TCRalpha chain (Valpha19i) that defines MAIT cells. By directly comparing Valpha19i transgenic mice on MR1+/+ and MR1-/- backgrounds, we were able to distinguish and characterize a population of Valpha19i T cells dependent on MR1 for development. MR1-restricted Valpha19i transgenic T cells recapitulate what is known about MAIT cell development. Furthermore, a relatively high proportion of transgenic MAIT cells express NK1.1, and most have a cell surface phenotype similar to that of Valpha14i NK T cells. Finally, MR1-restricted Valpha19i T cells secrete IFN-gamma, IL-4, IL-5, and IL-10 following TCR ligation, and we provide evidence for what may be two functionally distinct MAIT cell populations. These data strongly support the idea that MAIT cells contribute to the innate immune response in the gut mucosa.
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MESH Headings
- Animals
- Cells, Cultured
- Cytokines/biosynthesis
- Cytokines/metabolism
- Gene Rearrangement, alpha-Chain T-Cell Antigen Receptor
- Histocompatibility Antigens Class I/genetics
- Histocompatibility Antigens Class I/immunology
- Immunity, Innate
- Immunophenotyping
- Intestinal Mucosa/cytology
- Intestinal Mucosa/immunology
- Intestinal Mucosa/metabolism
- Killer Cells, Natural/immunology
- Killer Cells, Natural/metabolism
- Ligands
- Mice
- Mice, Transgenic
- Minor Histocompatibility Antigens
- Receptors, Antigen, T-Cell, alpha-beta/biosynthesis
- Receptors, Antigen, T-Cell, alpha-beta/genetics
- Receptors, Antigen, T-Cell, alpha-beta/metabolism
- T-Lymphocyte Subsets/immunology
- T-Lymphocyte Subsets/metabolism
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Affiliation(s)
- Izumi Kawachi
- Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA
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37
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Dai YD, Jensen KP, Lehuen A, Masteller EL, Bluestone JA, Wilson DB, Sercarz EE. A peptide of glutamic acid decarboxylase 65 can recruit and expand a diabetogenic T cell clone, BDC2.5, in the pancreas. THE JOURNAL OF IMMUNOLOGY 2005; 175:3621-7. [PMID: 16148106 DOI: 10.4049/jimmunol.175.6.3621] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Self peptide-MHC ligands create and maintain the mature T cell repertoire by positive selection in the thymus and by homeostatic proliferation in the periphery. A low affinity/avidity interaction among T cells, self peptides, and MHC molecules has been suggested for these events, but it remains unknown whether or how this self-interaction is involved in tolerance and/or autoimmunity. Several lines of evidence implicate the glutamic acid decarboxylase 65 (GAD-65) peptide, p524-543, as a specific, possibly low affinity, stimulus for the spontaneously arising, diabetogenic T cell clone BDC2.5. Interestingly, BDC2.5 T cells, which normally are unresponsive to p524-543 stimulation, react to the peptide when provided with splenic APC obtained from mice immunized with the same peptide, p524-543, but not, for example, with hen egg white lysozyme. Immunization with p524-543 increases the susceptibility of the NOD mice to type 1 diabetes induced by the adoptive transfer of BDC2.5 T cells. In addition, very few CFSE-labeled BDC2.5 T cells divide in the recipient's pancreas after transfer into a transgenic mouse that overexpresses GAD-65 in B cells, whereas they divide vigorously in the pancreas of normal NOD recipients. A special relationship between the BDC2.5 clone and the GAD-65 molecule is further demonstrated by generation of a double-transgenic mouse line carrying both the BDC2.5 TCR and GAD-65 transgenes, in which a significant reduction of BDC2.5 cells in the pancreas has been observed, presumably due to tolerance induction. These data suggest that unique and/or altered processing of self Ags may play an essential role in the development and expansion of autoreactive T cells.
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Affiliation(s)
- Yang D Dai
- Division of Immune Regulation, Torrey Pines Institute for Molecular Studies, San Diego, CA 92121, USA
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38
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Abstract
Recognition of a peptide-MHC complex by the T cell receptor (TCR) is a key interaction that initiates T lymphocyte activation or silencing during an immune response. Fluorochrome-labeled recombinant MHC class II-peptide reagents function as soluble mimetics of this interaction, bind to their specific TCR, and allow for detection of antigen-specific CD4+ T cells. These reagents are now under scrutiny for "immune staging" of patients at risk of type 1 diabetes, in an effort to diagnose islet autoimmunity early enough to block immune-mediated beta cell destruction. Several issues are currently being addressed to improve the performance of these T cell assays: enrichment steps for better sensitivity, multiplexing of several islet epitopes, simultaneous monitoring of CD4+ and CD8+ responses, detection of low avidity T cells, combination of quantitative (number of positive cells) and qualitative (cytokine secretion, naive/memory phenotype) readouts. CD4+ T cells are key effectors of autoimmunity, and these MHC class II peptide reagents, through their signaling properties, might also provide therapeutics to block the autoimmune process at its onset, analogous to the use of OKT3gammao1(AlaAla) anti-CD3 antibody but in an antigen-specific fashion. The aim of such therapeutics is to potentiate different physiological control mechanisms to restore immune tolerance. Mechanisms initiated by this pathway may be capable of triggering elimination of pathogenic T cells through antigen-specific apoptosis and anergy, combined with the induction of regulatory T cells with broad suppressive function.
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Affiliation(s)
- Roberto Mallone
- Benaroya Research Institute at Virginia Mason and Department of Immunology
University of Washington School of MedicineUS
| | - Gerald T. Nepom
- Benaroya Research Institute at Virginia Mason and Department of Immunology
University of Washington School of MedicineUS
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39
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Michaels MA, Kang HK, Kaliyaperumal A, Satyaraj E, Shi Y, Datta SK. A Defect in Deletion of Nucleosome-Specific Autoimmune T Cells in Lupus-Prone Thymus: Role of Thymic Dendritic Cells. THE JOURNAL OF IMMUNOLOGY 2005; 175:5857-65. [PMID: 16237078 DOI: 10.4049/jimmunol.175.9.5857] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
To study central tolerance to the major product of ongoing apoptosis in the thymus, we made new lines of transgenic (Tg) mice expressing TCR of a pathogenic autoantibody-inducing Th cell that was specific for nucleosomes and its histone peptide H4(71-94). In the lupus-prone (SWR x NZB)F1 (SNF1) thymus, introduction of the lupus TCR transgene caused no deletion, but marked down-regulation of the Tg TCR and up-regulation of endogenous TCRs. Paradoxically, autoimmune disease was suppressed in the alphabetaTCR Tg SNF1 mice with induction of highly potent regulatory T cells in the periphery. By contrast, in the MHC-matched, normal (SWR x B10. D2)F1 (SBF1), or in the normal SWR backgrounds, marked deletion of transgenic thymocytes occurred. Thymic lymphoid cells of the normal or lupus-prone mice were equally susceptible to deletion by anti-CD3 Ab or irradiation. However, in the steady state, spontaneous presentation of naturally processed peptides related to the nucleosomal autoepitope was markedly greater by thymic dendritic cells (DC) from normal mice than that from lupus mice. Unmanipulated thymic DC of SNF1 mice expressed lesser amounts of MHC class II and costimulatory molecules than their normal counterparts. These results indicate that apoptotic nucleosomal autoepitopes are naturally processed and presented to developing thymocytes, and a relative deficiency in the natural display of nucleosomal autoepitopes by thymic DC occurs in lupus-prone SNF1 mice.
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Affiliation(s)
- Marissa A Michaels
- Division of Rheumatology, Department of Medicine, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
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40
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Masteller EL, Warner MR, Tang Q, Tarbell KV, McDevitt H, Bluestone JA. Expansion of functional endogenous antigen-specific CD4+CD25+ regulatory T cells from nonobese diabetic mice. THE JOURNAL OF IMMUNOLOGY 2005; 175:3053-9. [PMID: 16116193 DOI: 10.4049/jimmunol.175.5.3053] [Citation(s) in RCA: 202] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
CD4+CD25+Foxp3+ regulatory T cells (T(reg)) are critical for controlling autoimmunity. Evidence suggests that T(reg) development, peripheral maintenance, and suppressive function are dependent on Ag specificity. However, there is little direct evidence that the T(reg) responsible for controlling autoimmunity in NOD mice or other natural settings are Ag specific. In fact, some investigators have argued that polyclonal Ag-nonspecific T(reg) are efficient regulators of immunity. Thus, the goal of this study was to identify, expand, and characterize islet Ag-specific T(reg) in NOD mice. Ag-specific T(reg) from NOD mice were efficiently expanded in vitro using IL-2 and beads coated with recombinant islet peptide mimic-MHC class II and anti-CD28 mAb. The expanded Ag-specific T(reg) expressed prototypic surface markers and cytokines. Although activated in an Ag-specific fashion, the expanded T(reg) were capable of bystander suppression both in vitro and in vivo. Importantly, the islet peptide mimic-specific T(reg) were more efficient than polyclonal T(reg) in suppressing autoimmune diabetes. These results provide a direct demonstration of the presence of autoantigen-specific T(reg) in the natural setting that can be applied as therapeutics for organ-specific autoimmunity.
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Affiliation(s)
- Emma L Masteller
- Diabetes Center, Department of Medicine, University of California, San Francisco, CA 94143-0540, USA
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41
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Abstract
Autoimmunity is a complex process that likely results from the summation of multiple defective tolerance mechanisms. The NOD mouse strain is an excellent model of autoimmune disease and an important tool for dissecting tolerance mechanisms. The strength of this mouse strain is that it develops spontaneous autoimmune diabetes, which shares many similarities to autoimmune or type 1a diabetes (T1D) in human subjects, including the presence of pancreas-specific autoantibodies, autoreactive CD4+ and CD8+ T cells, and genetic linkage to disease syntenic to that found in humans. During the past ten years, investigators have used a wide variety of tools to study these mice, including immunological reagents and transgenic and knockout strains; these tools have tremendously enhanced the study of the fundamental disease mechanisms. In addition, investigators have recently developed a number of therapeutic interventions in this animal model that have now been translated into human therapies. In this review, we summarize many of the important features of disease development and progression in the NOD strain, emphasizing the role of central and peripheral tolerance mechanisms that affect diabetes in these mice. The information gained from this highly relevant model of human disease will lead to potential therapies that may alter the development of the disease and its progression in patients with T1D.
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Affiliation(s)
- Mark S Anderson
- Diabetes Center, University of California, San Francisco, California 94143, USA.
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42
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Ranheim EA, Tarbell KV, Krogsgaard M, Mallet-Designe V, Teyton L, McDevitt HO, Weissman IL. Selection of aberrant class II restricted CD8+ T cells in NOD mice expressing a glutamic acid decarboxylase (GAD)65-specific T cell receptor transgene. Autoimmunity 2005; 37:555-67. [PMID: 15763918 DOI: 10.1080/08916930400020545] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
We previously described the generation of non-obese diabetic (NOD) mice expressing a transgenic T cell receptor (TCR) specific for peptide epitope 286-300 of the diabetes related self antigen, glutamic acid decarboxylase (GAD)65 in the context of I-A(g7) class II MHC, that are paradoxically protected from diabetes. In this report, we examine the atypical CD8+ cells in these mice. Unlike typical class II restricted TCR transgenic mice, GAD286 mice have normal numbers of CD8+ cells, half of which express high levels of the transgenic TCR. These MHC mismatched CD8+ cells persist in the periphery and proliferate to GAD286-300 peptide in vitro and in vivo in a class II restricted fashion. Interestingly, the CD8+ tetramer(-) T cells that are expressing endogenous TCR can delay diabetes induction in a transfer model, as we previously showed for CD4+ tetramer+ T cells in these mice. The MHC mismatched CD8+ cells appear to be positively selected in an atypical fashion, in that they do not upregulate CD69 or reexpress CD44, and they escape negative selection. We find that production of these CD8+ cells is not dependent on NOD thymus or high affinity of the TCR, but is dependent on the atypical TCR transgenic thymic environment.
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MESH Headings
- Animals
- Autoantigens/genetics
- Autoantigens/immunology
- CD8-Positive T-Lymphocytes/immunology
- Clonal Deletion/immunology
- Diabetes Mellitus, Type 1/genetics
- Diabetes Mellitus, Type 1/immunology
- Epitopes, T-Lymphocyte/genetics
- Epitopes, T-Lymphocyte/immunology
- Glutamate Decarboxylase/genetics
- Glutamate Decarboxylase/immunology
- Histocompatibility Antigens Class II/immunology
- Mice
- Mice, Inbred NOD
- Mice, Transgenic
- Receptors, Antigen, T-Cell/genetics
- Receptors, Antigen, T-Cell/immunology
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Affiliation(s)
- Erik A Ranheim
- Department of Pathology, University of Wisconsin, Madison, WI 53792, USA.
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43
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Sharma RB, Alegria JD, Talor MV, Rose NR, Caturegli P, Burek CL. Iodine and IFN-γ Synergistically Enhance Intercellular Adhesion Molecule 1 Expression on NOD.H2h4 Mouse Thyrocytes. THE JOURNAL OF IMMUNOLOGY 2005; 174:7740-5. [PMID: 15944276 DOI: 10.4049/jimmunol.174.12.7740] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
NOD.H2(h4) mice spontaneously develop autoimmune lymphocytic thyroiditis that mimics human Hashimoto's thyroiditis, a disease where iodine, IFN-gamma, and adhesion molecules have all been implicated in the pathogenesis. To study how iodine and IFN-gamma modulate the expression of ICAM-1, we analyzed NOD.H2(h4) thyrocytes in baseline conditions (day 0) and at several time points following supplementation of iodine in the drinking water. On day 0, a small percentage ( approximately 10%) of thyrocytes constitutively expressed ICAM-1. The expression gradually increased to 13, 25, and 41% on days 7, 14 and 28, respectively, returning to baseline (9%) on day 35. The initial ICAM-1 kinetics was paralleled by thyroidal infiltration of CD45(+) hemopoietic cells, which increased from an average of 4% on day 0 to an average of 13, 21, and 24% on days 14, 28, and 35, respectively. To distinguish whether the observed ICAM-1 increase was a direct effect of iodine or a consequence of the immune infiltrate, we treated mouse primary thyrocyte cultures with 0.01 mM sodium iodine and showed a 3-fold increased ICAM-1 expression. To assess interaction between IFN-gamma and iodine, we analyzed CD45 and ICAM-1expression on thyrocytes from NOD.H2(h4) wild-type and NOD.H2(h4) thyr-IFN-gamma transgenic littermates. Strikingly, IFN-gamma interacted synergistically with iodine to enhance ICAM-1 expression on thyrocytes. These findings suggest that iodine and IFN-gamma cooperate to promote thyroidal expression of ICAM-1 in this mouse model of thyroiditis, highlighting the complex interplay present in the pathogenesis of Hashimoto's thyroiditis.
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MESH Headings
- Adjuvants, Immunologic/administration & dosage
- Adjuvants, Immunologic/metabolism
- Adjuvants, Immunologic/pharmacology
- Administration, Oral
- Animals
- Cells, Cultured
- Disease Models, Animal
- Drug Synergism
- Female
- Housing, Animal
- Intercellular Adhesion Molecule-1/biosynthesis
- Interferon-gamma/genetics
- Interferon-gamma/metabolism
- Interferon-gamma/physiology
- Male
- Mice
- Mice, Inbred A
- Mice, Inbred BALB C
- Mice, Inbred C57BL
- Mice, Inbred NOD
- Mice, Transgenic
- Sodium Iodide/administration & dosage
- Sodium Iodide/antagonists & inhibitors
- Sodium Iodide/metabolism
- Species Specificity
- Thyroid Gland/cytology
- Thyroid Gland/drug effects
- Thyroid Gland/immunology
- Thyroid Gland/metabolism
- Thyroiditis, Autoimmune/genetics
- Thyroiditis, Autoimmune/immunology
- Thyroiditis, Autoimmune/therapy
- Up-Regulation/drug effects
- Up-Regulation/genetics
- Up-Regulation/immunology
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Affiliation(s)
- Rajni B Sharma
- Department of Pathology, School of Medicine, Johns Hopkins Medical Institutions, Baltimore, MD 21205, USA
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44
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Abstract
Regulatory T cells are now recognized as important mediators of self-tolerance and may mediate responses to immune therapy. The mechanisms of action of these cells are diverse, and some studies suggest that there may be defects in regulatory cells in patients with type 1 diabetes. These cells may be expanded by immune therapy, suggesting the possible development of adoptive immune therapy to transfer regulation with the cells.
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Affiliation(s)
- Brygida C Bisikirska
- Division of Endocrinology, Naomi Berrie Diabetes Center, Department of Medicine, College of Physicians and Surgeons, Columbia University, Room 10-105, 630 W. 168th Street, New York, NY 10032, USA
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45
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Abstract
CD4(+)CD25(+) T-cells can be used to interfere with spontaneous autoimmune diseases such as type 1 diabetes. However, their low frequency and often unknown specificity represent major obstacles to their therapeutic use. Here we have explored the fact that ectopic expression of the transcription factor Foxp3 can confer a suppressor phenotype to naive CD4(+) T-cells. We found that retroviral transduction of polyclonal CD4 T-cells with FoxP3 was not effective in interfering with established type 1 diabetes. Thus, more subtle and more organ-specific regulation might be required to prevent type 1 diabetes, as well as to avoid systemic immunosuppression. However, a single injection of 10(5) FoxP3-transduced T-cells with specificity for islet antigen stabilized and reversed disease in mice with recent-onset diabetes. By comparing FoxP3-transduced T-cells with various antigen specificities, it became clear that the in vivo effect correlated with specific homing to and activation in pancreatic lymph nodes and not with in vitro suppressor activity or cytokine production. Our results complement recent results on in vitro-amplified antigen-specific T-cells in ameliorating type 1 diabetes and suggest that FoxP3 transduction of expanded T-cells might achieve the same goal.
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Affiliation(s)
- Elmar Jaeckel
- Hannover Medical School, Department of Gastroenterology, Hepatology and Endocrinology, Carl Neuberg Str. 1, 30625 Hannover, Germany.
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46
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You S, Chen C, Lee WH, Brusko T, Atkinson M, Liu CP. Presence of diabetes-inhibiting, glutamic acid decarboxylase-specific, IL-10-dependent, regulatory T cells in naive nonobese diabetic mice. THE JOURNAL OF IMMUNOLOGY 2005; 173:6777-85. [PMID: 15557171 DOI: 10.4049/jimmunol.173.11.6777] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Immunization of NOD mice with autoantigens such as glutamic acid decarboxylase (GAD) 221-235 peptide (p221) can induce Ag-specific CD4(+) T regulatory (Tr) cells. However, it is unclear whether these Tr cells acquire their regulatory capacity due to immunization or whether they are constitutively harbored in unimmunized naive mice. To address this question, we used an I-Ag7 tetramer to isolate p221-specific T cells from naive NOD mice (N221(+) cells) after peptide-specific in vitro expansion. The N221(+) T cells produced IFN-gamma and IL-10, but very little IL-4, in response to p221 stimulation. These T cells could function as regulatory cells and inhibit in vitro proliferation of diabetogenic BDC2.5 cells. This suppressive activity was cell contact-independent and was abrogated by Abs to IL-10 or IL-10R. Interestingly, IL-2 produced by other T cells present in the cell culture induced unactivated N221(+) T cells to exhibit regulatory activities involving production of IL-10. In vivo, N221(+) cells inhibited diabetes development when cotransferred with NOD splenocytes into NOD/scid recipients. Together, these results demonstrate that p221-specific IL-10-dependent Tr cells, including Tr type 1 cells, are present in naive NOD mice. The use of spontaneously arising populations of GAD peptide-specific Tr cells may represent a promising immunotherapeutic approach for preventing type 1 diabetes.
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Affiliation(s)
- Sylvaine You
- Division of Immunology, Beckman Research Institute, City of Hope, Duarte, CA 91010, USA
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47
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McDevitt H. Specific antigen vaccination to treat autoimmune disease. Proc Natl Acad Sci U S A 2004; 101 Suppl 2:14627-30. [PMID: 15466699 PMCID: PMC521997 DOI: 10.1073/pnas.0405235101] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Specific antigen vaccination by administration of the target antigen in aqueous solution has resulted in significant decreases of disease severity in animal models of experimental allergic encephalomyelitis, type I diabetes, and several forms of antigen-induced arthritis, even if administered after the initiation of symptoms. However, in experimental autoimmune encephalomyelitis (EAE) and type I diabetes in nonobese diabetic (NOD) mice, repeated administration of peptide fragments of target antigens in incomplete Freund's adjuvant has resulted in severe anaphylactic reactions. Although these methods of administration are known to potentiate CD4 T helper 2 (Th2) responses, which is the goal of specific antigen vaccination, the risk of anaphylaxis raises a red flag concerning use of this therapy for diseases such as type I diabetes, where the survival time after onset is quite long. It is clear that specific antigen vaccination is effective in preventing several animal models of autoimmune disease, and in treating these diseases once the symptoms are overt. However, the risks of this therapy require serious consideration of alternative methods for down-regulation of the autoimmune process.
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MESH Headings
- Animals
- Autoantigens
- Autoimmune Diseases/immunology
- Autoimmune Diseases/therapy
- Diabetes Mellitus, Type 1/immunology
- Diabetes Mellitus, Type 1/therapy
- Disease Models, Animal
- Encephalomyelitis, Autoimmune, Experimental/immunology
- Encephalomyelitis, Autoimmune, Experimental/therapy
- Genes, T-Cell Receptor
- Glutamate Decarboxylase/immunology
- Immunotherapy/adverse effects
- Immunotherapy/methods
- Isoenzymes/immunology
- Mice
- Mice, Inbred NOD
- Mice, Transgenic
- Vaccines/therapeutic use
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Affiliation(s)
- Hugh McDevitt
- Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA 94305-5204, USA.
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Irie J, Shimada A, Oikawa Y, Shigihara T, Saruta T. N-acetyl-cysteine accelerates transfer of diabetes into non-obese diabetic scid mice. Diabetologia 2004; 47:1803-9. [PMID: 15502923 DOI: 10.1007/s00125-004-1529-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/19/2004] [Accepted: 07/18/2004] [Indexed: 10/26/2022]
Abstract
AIMS/HYPOTHESIS Type 1 diabetes mellitus is caused by autoimmune pancreatic beta cell destruction, and the destructive process involves several molecular mechanisms including oxygen-reactive species. A cysteine derivative, N-acetyl-cysteine, is widely used as an antioxidant, but the role of N-acetyl-cysteine in the protection of pancreatic beta cells in type 1 diabetes remains unclear. The aim of this study was to clarify the effect of N-acetyl-cysteine on beta cells using an adoptive transfer system in a murine model of type 1 diabetes. METHODS Splenocytes from diabetic female non-obese diabetic mice were transferred into female non-obese diabetic scid/ scid recipients to induce diabetes. Just after transfer, N-acetyl-cysteine was administered to non-obese diabetic scid recipients. Two weeks after transfer, the pancreas of the recipients was examined histologically, and cytokine mRNA expression in the pancreas was analysed. In vitro, CD4-positive splenocytes from diabetic donor mice were stimulated with anti-CD3 and anti-CD28 antibodies with or without N-acetyl-cysteine. RESULTS Treatment with N-acetyl-cysteine significantly accelerated the transfer of diabetes into non-obese diabetic scid recipients. Treatment with N-acetyl-cysteine accelerated the infiltration of mononuclear cells accompanied by CD8-positive cells into the intra-islet region of the recipient's pancreas, and enhanced interferon-gamma mRNA expression in the pancreas. In vitro, treatment with N-acetyl-cysteine enhanced interferon-gamma and interleukin-2 production by CD4-positive splenocytes of the diabetic donor mice. CONCLUSIONS/INTERPRETATION N-acetyl-cysteine accelerates the transfer of diabetes into non-obese diabetic scid mice and this effect is accompanied by the promotion of local infiltration and T-helper cell type 1 responses.
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Affiliation(s)
- J Irie
- Keio University School of Medicine, Tokyo, Japan
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49
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Arnold PY, Burton AR, Vignali DAA. Diabetes incidence is unaltered in glutamate decarboxylase 65-specific TCR retrogenic nonobese diabetic mice: generation by retroviral-mediated stem cell gene transfer. THE JOURNAL OF IMMUNOLOGY 2004; 173:3103-11. [PMID: 15322170 DOI: 10.4049/jimmunol.173.5.3103] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
TCR transgenic mice are valuable tools for dissecting the role of autoantigen-specific T cells in the pathogenesis of type 1 diabetes but are time-consuming to generate and backcross onto congenic strains. To circumvent these limitations, we developed a new approach to rapidly generate mice expressing TCR using retroviral-mediated stem cell gene transfer and a novel picornavirus-like 2A peptide to link the TCR alpha- and beta-chains in a single retroviral vector. We refer to these as retrogenic (Rg) mice to avoid confusion with conventional transgenic mice. Our approach was validated by demonstrating that Rg nonobese diabetic (NOD)-scid mice expressing the diabetogenic TCRs, BDC2.5 and 4.1, generate clonotype-positive T cells and develop diabetes. We then expressed three TCR specific for either glutamate decarboxylase (GAD) 206-220 or GAD 524-538 or for hen egg lysozyme 11-25 as a control in NOD, NOD-scid, and B6.H2(g7) mice. Although T cells from these TCR Rg mice responded to their respective Ag in vitro, the GAD-specific T cells exhibited a naive, resting phenotype in vivo. However, T cells from Rg mice challenged with Ag in vivo became activated and developed into memory cells. Neither of the GAD-reactive TCR accelerated or protected mice from diabetes, nor did activated T cells transfer or protect against diabetes in NOD-scid recipients, suggesting that GAD may not be a primary target for diabetogenic T cells. Generation of autoantigen-specific TCR Rg mice represents a powerful approach for the analysis of a wide variety of autoantigens.
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Affiliation(s)
- Paula Y Arnold
- Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA
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50
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Kim SK, Tarbell KV, Sanna M, Vadeboncoeur M, Warganich T, Lee M, Davis M, McDevitt HO. Prevention of type I diabetes transfer by glutamic acid decarboxylase 65 peptide 206-220-specific T cells. Proc Natl Acad Sci U S A 2004; 101:14204-9. [PMID: 15381770 PMCID: PMC521137 DOI: 10.1073/pnas.0405500101] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Glutamic acid decarboxylase (GAD) 65 is one of the major pancreatic antigens targeted by self-reactive T cells in type I diabetes mellitus. T cells specific for GAD65 are among the first to enter inflamed islets and may be important for the initiation of autoimmune diabetes. However, we previously reported that nonobese diabetic (NOD) mice transgenic for a T cell antigen receptor (TCR) specific for one of the immunodominant epitopes of GAD65, peptide 286-300 (G286), are protected from insulitis and diabetes. To examine whether other GAD65-reactive T cells share this phenotype, we have generated TCR transgenic NOD mice for a second immunodominant epitope of GAD65, peptide 206-220 (G206). As in G286 mice, G206 mice do not develop islet inflammation or diabetes. When adoptively transferred along with diabetogenic T cells, activated G206 T cells significantly delayed the onset of diabetes in NOD.scid recipients. Both G206 and G286 T cells produce immunoregulatory cytokines IFN-gamma and IL-10 at low levels when activated by cognate antigens. These data suggest that GAD65-specific T cells may play a protective role in diabetes pathogenesis by regulating pathogenic T cell responses. A better understanding of the functions of autoreactive T cells in type I diabetes will be necessary for choosing desirable targets for immunotherapy.
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MESH Headings
- Amino Acid Sequence
- Animals
- CD4 Antigens/immunology
- Cells, Cultured
- Diabetes Mellitus, Type 1/enzymology
- Diabetes Mellitus, Type 1/genetics
- Diabetes Mellitus, Type 1/immunology
- Diabetes Mellitus, Type 1/prevention & control
- Epitopes, T-Lymphocyte/immunology
- Epitopes, T-Lymphocyte/metabolism
- Female
- Genetic Predisposition to Disease
- Glucose/analysis
- Glutamate Decarboxylase/immunology
- Glutamate Decarboxylase/metabolism
- Immunotherapy, Adoptive/methods
- Interferon-gamma/biosynthesis
- Interleukin-10/biosynthesis
- Lymphocyte Activation/immunology
- Mice
- Mice, Inbred NOD
- Mice, Transgenic
- Peptide Fragments/immunology
- Receptors, Antigen, T-Cell/deficiency
- Receptors, Antigen, T-Cell/genetics
- Receptors, Antigen, T-Cell/immunology
- T-Lymphocytes/cytology
- T-Lymphocytes/enzymology
- T-Lymphocytes/immunology
- T-Lymphocytes/metabolism
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Affiliation(s)
- Seon-Kyeong Kim
- Department of Microbiology and Immunology, Stanford University School of Medicine, 299 Campus Drive, Stanford, CA 94305, USA
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