Identical T-cell receptor beta chain rearrangements are present in T cells infiltrating the jejunal mucosa of untreated celiac patients.

he intestinal mucosal lesion in celiac disease is characterized by a predominant T-cell infiltration of both epithelium and lamina propria. However, a restricted use of T-cell receptors (TCR) in T lymphocytes infiltrating the jejunal mucosa of celiac patients has not been reported. Based on an immunohistochemical survey of jejunal biopsies from a cohort of untreated celiac patients, we demonstrated a small but significant increase of V?8.1/2+ T cells in the lamina propria, but not in the epithelium nor in the peripheral blood. Sequence analysis indicated the existence of a variable degree of clonality of V?8+ T cells in the celiac mucosa. More importantly, the recurrence of identical CDR3 regions in some patients was also observed. The altered distribution of V?8+ T cells and the presence of identical CDR3 regions in celiac patients, but not in controls was independently confirmed by CDR3 size analysis in a further cohort of patients. These findings suggest that disease-specific variations of the TCRBV8 repertoire are present in the small intestinal mucosa of untreated celiac patients.