Colonic IgA producing cells and macrophages are reduced in recurrent and non-recurrent Clostridium difficile associated diarrhoea

Journal of Clinical Pathology
S S JohalY R Mahida

Abstract

In Clostridium difficile associated diarrhoea (CDAD), histological changes in the colonic mucosa range from minimal inflammation to pseudomembranous colitis (PMC). The disease also recurs in a considerable proportion of patients. To investigate mucosal immune system cells in colonic biopsies of patients with CDAD. Colonic biopsies were obtained from 12 control patients with diarrhoea, six patients with CDAD and minimal inflammation, and 10 patients with CDAD with pseudomembranous colitis (samples obtained from areas with and without inflammatory exudate). Immunohistochemical studies were performed using antibodies to T cells (CD3), macrophages (CD68), B/plasma cells (CD79alpha), and to IgA, IgM, and IgG. Labelled cells in lamina propria were quantified. In contrast to T cells, there were significant reductions in B/plasma cell and macrophage counts in all biopsies from patients with CDAD compared with controls (p<0.001). Studies using anti-immunoglobulin antibodies showed significant reductions in IgA producing cells in CDAD biopsies (p<0.05), with the greatest reduction in samples from patients with PMC. In contrast, there was a significant increase (p<0.05) in IgG producing cells in CDAD biopsies. Only patients with PMC relap...Continue Reading

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