Background. The diagnosis of IgG4-associated sclerosing disease, IgG4-associatied condition, is based on a comprehensive evaluation of characteristic clinical, radiographic, serologic, histological and immunohistochemical features. The histopathological is the main examination in the diagnosis of IgG4-associatied diseases. The purpose of the study was to evaluate the state of IgG4-positive plasma cells in the mucosa of the colon in patients with established morphological and endoscopic diagnosis of ulcerative colitis (UC) and Crohn’s disease (CD). Materials and methods. The study used biopsies material from 14 patients treated at the Institute of Gastroenterology, in the department intestine diseases, with established morphological and endoscope diagnosis of UC (8) and CD (6) in the acute stage. All patients had no evidence of autoimmune pancreatitis type I and II. Biopsy were fixed in 10.0% neutral formalin, dehydrated in alcohols of increasing concentration and embedded in paraffin for histological studies. Histological sections of 3–5 µm were colored with hematoxylin and eosin. There were used monoclonal IgG4 antibodies for immunohistochemical studies (Abcam, USA). Results. Our results show that with ulcerative colitis in 37.5 % of cases IgG4-positive plasma cells in the colon mucosa have not been identified. In 25 % of cases, sporadic IgG4-positive plasma cells were identified. In 37.5 % of cases, the groups of IgG4-positive plasma cells not exceeding 5 cells in one group were found. In Crohn’s disease, groups of IgG4-positive plasma cells were observed in all cases, in addition it should be noted that the group included 10 or more cells. Conclusions. It is shown that in UC, IgG4-positive plasma cells may be absent, solitary or gathered in small groups to 5 cells, and in CD, the groups consisting of 10 or more cells are observed.
IgG4-positive plasma cells; ulcerative colitis; Crohn’s disease
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