As reported by MedicalXpress, Researchers have uncovered a surprising immune function in specialized intestinal cells that may reshape our understanding of gut health and autoimmune disorders. The study, published in Nature by the Clevers Group at the Hubrecht Institute, focuses on microfold cells (M cells), epithelial cells that help the small intestine defend against harmful microbes.
Traditionally, M cells were thought to simply transport antigens from the gut to immune cells. Most of this knowledge came from mouse models. However, using human intestinal organoids, scientists discovered that human M cells go further: they process antigens and present them directly to T helper cells, a role typically reserved for professional immune cells like dendritic cells. This function was absent in mouse M cells, marking a significant species difference.
The team identified ICAM2 as a key marker for tracking M-cell development and found that these cells share genetic traits with antigen-presenting immune cells, including expression of MHC-II. High-resolution imaging confirmed their structural features, such as reduced microvilli.
Crucially, the researchers demonstrated that human M cells can take up gluten, break it down, and present it to T cells, mimicking the early steps of celiac disease. This suggests M cells may play a pivotal role in triggering the condition, which affects millions worldwide.
Beyond celiac disease, these findings open new avenues for studying gut immunity, food sensitivities, and inflammatory disorders. Future research will explore how M cells behave in real tissue and whether targeting their functions could lead to novel diagnostics or therapies.
