Gut‐associated lymphoid tissue and 1,2‐dimethylhydrazine intestinal tumors in the rat: An histological and immunoenzymatic study

The association between chemically‐induced intestinal carcinoma and gut lymphoid patches was studied in 20 male Sprague‐Dawley rats 7 months after the first of 16 weekly injections of 1,2 dimethylhydrazine (DMH). The lymphoid patches of DMH‐treated rats and of 14 untreated control animals were systematically studied histologically on sections of “swiss‐rolled” whole intestine. It was found that 78% of the small‐intestine carcinomas and 73% of the colorectal carcinomas were associated with intestinal lymphoid patches. Furthermore, misplaced and often atypical glandular crypts were often found in the parafollicular or interfollicular areas of lymphoid patches, in treated as well as in control animals. These glands could be the origin of the lymphoid‐patch‐associated carcinoma. Immunohistological staining with monoclonal antibodies (MAbs) against T‐lymphocyte antigens or anti‐IgM serum labelling B lymphocytes clearly localized early carcinoma and atypical glands in the T‐dependent, interfollicular and parafollicular area of lymphoid follicles. An MAb directed against la‐antigen stained some well‐differentiated carcinomas and some atypical glands found in control rats. On the other hand, lymphoid patches, when not invaded by a carcinoma, were not modified in their number, size, morphology or cellular composition in DMH‐treated rats as compared to control animals.

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