QUANTITATIVE-ANALYSIS AND IMMUNOHISTOCHEMICAL STUDIES ON SMALL-INTESTINAL MUCOSA OF FOOD-SENSITIVE ENTEROPATHY

Quantitative analysis and immunohistochemical studies of small intesti nal mucosa were performed to investigate the mechanism of mucosal dama ge in 10 patients with food-sensitive enteropathy. Jejunal biopsy spec imens were taken before and after treatment and after clinical relapse following a challenge test. The low villous height of untreated patie nts normalized after introduction of an elimination diet but declined again to subnormal level after a challenge test. Several other types o f cells were significantly increased in the untreated patients in comp arison to controls. These included HLA-DR(+) (DR(+)) CD4(+) cells in t he lamina propria and intraepithelial CD8(+) cells. Moreover, those ce ll patterns, such as increased DR(+) CD4(+) cells and CD8(+) cells, no rmalized with treatment but regressed to pretreatment levels when the patients were challenged. These findings suggest that activated CD4(+) cells in the lamina propria of the small intestinal mucosa, probably by releasing cytokines, may play an important role in contributing to mucosal damage in patients with food-sensitive enteropathy.