Researchers Identify Immune Cell Defects Linked to Celiac Development

Celiac disease may begin with an unexpectedly weak immune response rather than an overactive one, according to new research that challenges long-standing views about autoimmune disorders.

Scientists from the Snow Centre for Immune Health found that people with celiac disease have subtle but consistent differences in how key immune cells function, suggesting that autoimmune risk may be rooted in underlying immune defects long before symptoms appear.

Published in Immunology & Cell Biology, the study focused on CD4 helper T cells, a type of immune cell responsible for coordinating immune responses, fighting infections, and supporting antibody production. Researchers used an advanced technique called the Cyton2 Cell Timer model to track how these cells behaved after receiving a brief activation signal.

Unlike traditional laboratory tests that continuously stimulate immune cells, this approach allowed scientists to observe how well the cells maintained their activity once the initial signal was removed. The method provided a clearer picture of the cells' natural "momentum" and resilience.

Surprisingly, immune cells from people with celiac disease were not more active than normal. Instead, they showed weaker responses. The researchers found that CD4 helper T cells produced lower levels of interleukin-2, an important immune signaling molecule, entered cell division more slowly, and were less likely to survive.

These differences were observed regardless of whether participants had recently been diagnosed or were successfully managing the condition with a gluten-free diet. The pattern was also consistent across both men and women, suggesting the changes may be linked to underlying genetic risk rather than ongoing inflammation or dietary factors.

Although the study focused on celiac disease, scientists say similar immune patterns may exist in other autoimmune conditions. In the future, combining genetic information with detailed immune-function testing could help identify people at risk earlier and potentially allow intervention before disease develops.

REFERENCE: Farchione, A. J., et al. (2026). Functional immune profiling reveals CD4 + T cell dysregulation in coeliac disease. Immunology and Cell Biology. DOI: 10.1111/imcb.70132. https://onlinelibrary.wiley.com/doi/10.1111/imcb.70132