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Microscopic pathology of duodenum in rats exposed to Fusarium graminearum, a fungus infecting small-grain cereals, was investigated. Intestinal haemorrhage was observed macroscopically in one of the rats. Light microscopy demonstrated detachments between the surface epithelium and the lamina propria and severe interstitial oedema in the lamina propria in the test group. Electron microscopy identified epithelial absorptive cells with highly expanded endoplasmic reticulum tubules, abundant cytoplasmic vesicles containing electron-lucent materials, swollen mitochondria with spongiform appearance, and prominent cellular swelling. Other observations included opening of junctional complexes between epithelial cells lining the duodenum, highly enlarged intercellular spaces in duodenal epithelium, and numerous eosinophilic granulocytes and mast cells in the lamina propria. These findings indicate that dietary F. graminearum causes epithelial cell and connective tissue damage in rat duodenum. This is the first histopathological study showing that F. graminearum ingestion is associated with duodenal damage.

Histopathological Effects of Dietary Fusarium Graminearum on Rat Duodenum