CD8+ T lymphocytes specific for glutamic acid decarboxylase 90–98 epitope mediate diabetes in NODSCID mouse
During the past decade, glutamic acid decarboxylase (GAD) has been considered a crucial β-cell autoantigen involved in type 1 diabetes in the NOD mouse and human. Recently, the etiological role of GAD has remained controversy. In the NOD mouse, some previous studies argued in favor of a regulatory r...
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Published in | Molecular immunology Vol. 44; no. 11; pp. 2950 - 2960 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier
01.04.2007
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Abstract | During the past decade, glutamic acid decarboxylase (GAD) has been considered a crucial β-cell autoantigen involved in type 1 diabetes in the NOD mouse and human. Recently, the etiological role of GAD has remained controversy. In the NOD mouse, some previous studies argued in favor of a regulatory role for GAD-specific CD4+ T cells, and no diabetogenic CD8+ T cells specific for GAD have been identified so far, discrediting the importance of GAD in β-cell injury. Here, we identified, in the NOD model, a relevant GAD CD8+ T cell epitope (GAD90–98) using immunization with a plasmid encoding GAD, a protocol relying on in vivo processing of peptides from the autoantigenic protein. In pancreatic lymph nodes of naïve female NOD mice, CD8+ T lymphocytes recognizing GAD90–98 peptide were detected during the initial phase of invasive insulitis (between 4 and 8 weeks of age), suggesting an important role for these cells in the first stage of the disease. GAD90–98 specific CD8+ lymphocytes lysed efficiently islet cells in vitro and transferred diabetes into NODSCID mice (100%). Finally, diabetes was accelerated greatly in 3-week-old female NOD mice injected i.p. with GAD90–98, strengthening the role of GAD-specific CTLs in diabetes pathogenesis. |
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AbstractList | During the past decade, glutamic acid decarboxylase (GAD) has been considered a crucial β-cell autoantigen involved in type 1 diabetes in the NOD mouse and human. Recently, the etiological role of GAD has remained controversy. In the NOD mouse, some previous studies argued in favor of a regulatory role for GAD-specific CD4+ T cells, and no diabetogenic CD8+ T cells specific for GAD have been identified so far, discrediting the importance of GAD in β-cell injury. Here, we identified, in the NOD model, a relevant GAD CD8+ T cell epitope (GAD90–98) using immunization with a plasmid encoding GAD, a protocol relying on in vivo processing of peptides from the autoantigenic protein. In pancreatic lymph nodes of naïve female NOD mice, CD8+ T lymphocytes recognizing GAD90–98 peptide were detected during the initial phase of invasive insulitis (between 4 and 8 weeks of age), suggesting an important role for these cells in the first stage of the disease. GAD90–98 specific CD8+ lymphocytes lysed efficiently islet cells in vitro and transferred diabetes into NODSCID mice (100%). Finally, diabetes was accelerated greatly in 3-week-old female NOD mice injected i.p. with GAD90–98, strengthening the role of GAD-specific CTLs in diabetes pathogenesis. |
Author | Bach, Jean-Marie Vu, Anh-Tuan Sévère, Sabine Gauvrit, Anne |
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Title | CD8+ T lymphocytes specific for glutamic acid decarboxylase 90–98 epitope mediate diabetes in NODSCID mouse |
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