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• W2277571516 abstract "Celiac disease (CD) is an HLA-associated disorder characterized by a harmful T cell response to dietary gluten. It is not understood why most individuals who carry CD-associated HLA molecules, such as HLA-DQ2.5, do not develop CD despite continuous gluten exposure. In this study, we have used tetramers of HLA-DQ2.5 bound with immunodominant gluten epitopes to explore whether HLA-DQ2.5(+) healthy individuals mount a specific CD4(+) T cell response to gluten. We found that gluten tetramer-binding memory cells were rare in blood of healthy individuals. These cells showed lower tetramer-binding intensity and no signs of biased TCR usage compared with gluten tetramer-binding memory T cells from patients. After sorting and in vitro expansion, only 18% of the tetramer-binding memory cells from healthy subjects versus 79% in CD patients were gluten-reactive upon tetramer restaining. Further, T cell clones of tetramer-sorted memory cells of healthy individuals showed lower gluten-specific proliferative responses compared with those of CD patients, indicating that tetramer-binding memory cells in healthy control subjects may be cross-reactive T cells. In duodenal biopsy specimens of healthy control subjects, CD4(+) T cells were determined not to be gluten reactive. Finally, gluten tetramer-binding cells of healthy individuals did not coexpress regulatory T cell markers (Foxp3(+) CD25(+)) and cultured T cell clones did not express a cytokine profile that indicated immune-dampening properties. The results demonstrate that healthy HLA-DQ2.5(+) individuals do not mount a T cell response to immunodominant gluten epitopes of CD." @default.
• W2277571516 created "2016-06-24" @default.
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• W2277571516 date "2016-03-15" @default.
• W2277571516 modified "2023-10-18" @default.
• W2277571516 title "Healthy HLA-DQ2.5+ Subjects Lack Regulatory and Memory T Cells Specific for Immunodominant Gluten Epitopes of Celiac Disease" @default.
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• W2277571516 doi "https://doi.org/10.4049/jimmunol.1501152" @default.
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