Autoreactive T cells specific for insulin B:11-23 recognize a low-affinity peptide register in human subjects with autoimmune diabetes
Previous studies in type 1 diabetes (T1D) in the nonobese diabetic mouse demonstrated that a crucial insulin epitope (B:9-23) is presented to diabetogenic CD4 T cells by IA(g7) in a weakly bound register. The importance of antigenic peptides with low-affinity HLA binding in human autoimmune disease...
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| Vydané v: | Proceedings of the National Academy of Sciences - PNAS Ročník 111; číslo 41; s. 14840 |
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| Hlavní autori: | , , , , , , , , |
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14.10.2014
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| Abstract | Previous studies in type 1 diabetes (T1D) in the nonobese diabetic mouse demonstrated that a crucial insulin epitope (B:9-23) is presented to diabetogenic CD4 T cells by IA(g7) in a weakly bound register. The importance of antigenic peptides with low-affinity HLA binding in human autoimmune disease remains less clear. The objective of this study was to investigate T-cell responses to a low-affinity self-epitope in subjects with T1D. HLA-DQ8 tetramers loaded with a modified insulin peptide designed to improve binding the low-affinity register were used to visualize T-cell responses following in vitro stimulation. Positive responses were only detectable in T1D patients. Because the immunogenic register of B:9-23 presented by DQ8 has not been conclusively demonstrated, T-cell assays using substituted peptides and DQ8 constructs engineered to express and present B:9-23 in fixed binding registers were used to determine the immunogenic register of this peptide. Tetramer-positive T-cell clones isolated from T1D subjects that responded to stimulation by B:11-23 peptide and denatured insulin protein were conclusively shown to recognize B:11-23 bound to HLA-DQ8 in the low-affinity register 3. These T cells also responded to homologous peptides derived from microbial antigens, suggesting that their initial priming could occur via molecular mimicry. These results are in accord with prior observations from the nonobese diabetic mouse model, suggesting a mechanism shared by mouse and man through which T cells that recognize a weakly bound peptide can circumvent tolerance mechanisms and play a role in the initiation of autoimmune diseases, such as T1D. |
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| AbstractList | Previous studies in type 1 diabetes (T1D) in the nonobese diabetic mouse demonstrated that a crucial insulin epitope (B:9-23) is presented to diabetogenic CD4 T cells by IA(g7) in a weakly bound register. The importance of antigenic peptides with low-affinity HLA binding in human autoimmune disease remains less clear. The objective of this study was to investigate T-cell responses to a low-affinity self-epitope in subjects with T1D. HLA-DQ8 tetramers loaded with a modified insulin peptide designed to improve binding the low-affinity register were used to visualize T-cell responses following in vitro stimulation. Positive responses were only detectable in T1D patients. Because the immunogenic register of B:9-23 presented by DQ8 has not been conclusively demonstrated, T-cell assays using substituted peptides and DQ8 constructs engineered to express and present B:9-23 in fixed binding registers were used to determine the immunogenic register of this peptide. Tetramer-positive T-cell clones isolated from T1D subjects that responded to stimulation by B:11-23 peptide and denatured insulin protein were conclusively shown to recognize B:11-23 bound to HLA-DQ8 in the low-affinity register 3. These T cells also responded to homologous peptides derived from microbial antigens, suggesting that their initial priming could occur via molecular mimicry. These results are in accord with prior observations from the nonobese diabetic mouse model, suggesting a mechanism shared by mouse and man through which T cells that recognize a weakly bound peptide can circumvent tolerance mechanisms and play a role in the initiation of autoimmune diseases, such as T1D.Previous studies in type 1 diabetes (T1D) in the nonobese diabetic mouse demonstrated that a crucial insulin epitope (B:9-23) is presented to diabetogenic CD4 T cells by IA(g7) in a weakly bound register. The importance of antigenic peptides with low-affinity HLA binding in human autoimmune disease remains less clear. The objective of this study was to investigate T-cell responses to a low-affinity self-epitope in subjects with T1D. HLA-DQ8 tetramers loaded with a modified insulin peptide designed to improve binding the low-affinity register were used to visualize T-cell responses following in vitro stimulation. Positive responses were only detectable in T1D patients. Because the immunogenic register of B:9-23 presented by DQ8 has not been conclusively demonstrated, T-cell assays using substituted peptides and DQ8 constructs engineered to express and present B:9-23 in fixed binding registers were used to determine the immunogenic register of this peptide. Tetramer-positive T-cell clones isolated from T1D subjects that responded to stimulation by B:11-23 peptide and denatured insulin protein were conclusively shown to recognize B:11-23 bound to HLA-DQ8 in the low-affinity register 3. These T cells also responded to homologous peptides derived from microbial antigens, suggesting that their initial priming could occur via molecular mimicry. These results are in accord with prior observations from the nonobese diabetic mouse model, suggesting a mechanism shared by mouse and man through which T cells that recognize a weakly bound peptide can circumvent tolerance mechanisms and play a role in the initiation of autoimmune diseases, such as T1D. Previous studies in type 1 diabetes (T1D) in the nonobese diabetic mouse demonstrated that a crucial insulin epitope (B:9-23) is presented to diabetogenic CD4 T cells by IA(g7) in a weakly bound register. The importance of antigenic peptides with low-affinity HLA binding in human autoimmune disease remains less clear. The objective of this study was to investigate T-cell responses to a low-affinity self-epitope in subjects with T1D. HLA-DQ8 tetramers loaded with a modified insulin peptide designed to improve binding the low-affinity register were used to visualize T-cell responses following in vitro stimulation. Positive responses were only detectable in T1D patients. Because the immunogenic register of B:9-23 presented by DQ8 has not been conclusively demonstrated, T-cell assays using substituted peptides and DQ8 constructs engineered to express and present B:9-23 in fixed binding registers were used to determine the immunogenic register of this peptide. Tetramer-positive T-cell clones isolated from T1D subjects that responded to stimulation by B:11-23 peptide and denatured insulin protein were conclusively shown to recognize B:11-23 bound to HLA-DQ8 in the low-affinity register 3. These T cells also responded to homologous peptides derived from microbial antigens, suggesting that their initial priming could occur via molecular mimicry. These results are in accord with prior observations from the nonobese diabetic mouse model, suggesting a mechanism shared by mouse and man through which T cells that recognize a weakly bound peptide can circumvent tolerance mechanisms and play a role in the initiation of autoimmune diseases, such as T1D. |
| Author | James, Eddie A Kwok, William W Kappler, John W Yang, Junbao Greenbaum, Carla J Torres-Chinn, Nadia Davidson, Howard W Sosinowski, Tomasz Chow, I-Ting |
| Author_xml | – sequence: 1 givenname: Junbao surname: Yang fullname: Yang, Junbao organization: Benaroya Research Institute, Seattle, WA 98101 – sequence: 2 givenname: I-Ting surname: Chow fullname: Chow, I-Ting organization: Benaroya Research Institute, Seattle, WA 98101 – sequence: 3 givenname: Tomasz surname: Sosinowski fullname: Sosinowski, Tomasz organization: Barbara Davis Center for Diabetes, University of Colorado, Aurora, CO 80045 – sequence: 4 givenname: Nadia surname: Torres-Chinn fullname: Torres-Chinn, Nadia organization: Benaroya Research Institute, Seattle, WA 98101 – sequence: 5 givenname: Carla J surname: Greenbaum fullname: Greenbaum, Carla J organization: Benaroya Research Institute, Seattle, WA 98101 – sequence: 6 givenname: Eddie A surname: James fullname: James, Eddie A organization: Benaroya Research Institute, Seattle, WA 98101 – sequence: 7 givenname: John W surname: Kappler fullname: Kappler, John W email: kapplerj@njhealth.org, bkwok@benaroyaresearch.org organization: Department of Biomedical Research and Howard Hughes Medical Institute, National Jewish Health, Denver, CO 80206; Department of Immunology and Microbiology, University of Colorado School of Medicine, Denver, CO 80045; and kapplerj@njhealth.org bkwok@benaroyaresearch.org – sequence: 8 givenname: Howard W surname: Davidson fullname: Davidson, Howard W organization: Barbara Davis Center for Diabetes, University of Colorado, Aurora, CO 80045; Howard Hughes Medical Institute, National Jewish Health, Denver, CO 80206; Department of Immunology and Microbiology, University of Colorado School of Medicine, Denver, CO 80045; and – sequence: 9 givenname: William W surname: Kwok fullname: Kwok, William W email: kapplerj@njhealth.org, bkwok@benaroyaresearch.org organization: Benaroya Research Institute, Seattle, WA 98101; Department of Medicine, University of Washington, Seattle, WA 98195 kapplerj@njhealth.org bkwok@benaroyaresearch.org |
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| SubjectTerms | Amino Acid Sequence Animals Case-Control Studies CD4-Positive T-Lymphocytes - immunology Cell Proliferation Cell Separation Clone Cells Diabetes Mellitus, Type 1 - immunology HLA-DQ Antigens Humans Insulin - chemistry Insulin - immunology Lymphocyte Activation - immunology Mice Molecular Sequence Data Peptides - chemistry Peptides - immunology |
| Title | Autoreactive T cells specific for insulin B:11-23 recognize a low-affinity peptide register in human subjects with autoimmune diabetes |
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