Summary:
This study explores an emerging discovery on the causation of coeliac disease, being that it may partly arise from differences in how the immune system is programmed before gluten is ever encountered. The discovery is on naïve T cells, which are immune cells that have not yet responded to any antigen. The behaviour of these cells can reveal early, genetically driven problems that might make some people more likely to develop coeliac disease. The study tests whether any baseline differences exist and whether they could contribute to the abnormal immune responses seen once gluten is introduced. Coeliac disease is an intestinal immune disorder triggered when gluten peptides activate other cells. This study uses a laboratory method that gives naïve T cells a very strong, short burst of stimulation and then suddenly takes that stimulation away. The idea is to see how much momentum the cells keep after the signal stops. In simple terms, it checks whether the cells keep dividing, stay alive and turn their activation markers on or off after that brief push. Because the experiment keeps IL‑2 (interleukin‑2, a chemical signal that T cells use to talk to each other) levels the same for all samples, any differences in behaviour come from the cells themselves, not from the environment. This allows the study to compare naïve T cells from people with coeliac disease and healthy people to see whether the coeliac group already shows unusual behaviour before ever seeing gluten. The results show that naïve T cells from people with coeliac disease do not respond as strongly to the activation burst. They divide less, die more easily, make less IL‑2 and stay switched on for longer than healthy cells. The is measured by a marker called CD69, which normally turns off after activation but does so more slowly in coeliac disease. These differences appear both in people who have just been diagnosed and in those who have been on a gluten‑free diet for a long time. This means the abnormalities are built into the cells rather than caused by current inflammation. These findings suggest that people with coeliac disease may have inherited differences in how their naïve T cells behave at baseline, and these differences could make their immune system more likely to react abnormally once gluten is encountered.
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Abstract:
T cells integrate signals from antigen and costimulatory receptors to calibrate response magnitude and quality, with genetically encoded programs shaping activation thresholds for immune tolerance and feedback regulation. Coeliac disease (CeD) is an autoimmune disorder with well-defined genetic risk and immune dysregulation triggered by dietary gluten. However, how genetic risk translates into cell-intrinsic functional variation, particularly within the naïve T-cell compartment, remains poorly defined. Here, we developed the T cell momentum assay, a quantitative functional profiling platform combining standardized T-cell activation with defined stimulus withdrawal to measure proliferation, survival and activation dynamics over time. Integrated with the Cyton2 mathematical model, this approach infers cellular fate programs from population-level dynamics, enabling high-resolution analysis of intrinsic T-cell behavior. Applying this assay to naïve T cells from individuals with CeD and healthy donors (HDs), we identified disease-associated abnormalities predominantly in CD4+ T cells, including hypoproliferation, reduced IL-2 secretion, impaired survival and delayed downregulation of CD69, indicating prolonged activation and impaired feedback regulation. Distinct early alterations in CD8+ T cells were also observed. These abnormalities were present in both newly diagnosed individuals and those on a gluten-free diet, supporting a cell-intrinsic phenotype not solely attributable to active inflammation and is consistent with altered baseline immune function. Together, our findings reveal previously unrecognized alterations in naïve T-cell programming in CeD, linking inherited immune variation to functional dysregulation beyond antigen-specific responses. More broadly, the momentum assay offers a scalable, model-informed framework to detect subtle early T cell dysregulation and functionally stratify immune variation across autoimmune diseases.
Article Publication Date: 17/05/2026
DOI: 10.1111/imcb.70132
