Effect of diet on gastric mucosa cells in the European eel ( Anguilla anguilla L.). Histochemical and ultrastructural study

We studied the cytochemical features and the ultrastructural changes in cells of the gastric mucosa in European eel ( Anguilla anguilla L.) fed an experimental isocaloric diet that supplied half the optimum amount of protein, and increased carbohydrates. The superficial mucosa cells were identifiabl...

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Published in:Micron (Oxford, England : 1993) England : 1993), 1996-02, Vol.27 (1), p.25-34
Main Authors: Garrido, M.V. Ostos, Oller, C. González, Equisoain, M.A. Abaurrea
Format: Article
Language:English
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Summary:We studied the cytochemical features and the ultrastructural changes in cells of the gastric mucosa in European eel ( Anguilla anguilla L.) fed an experimental isocaloric diet that supplied half the optimum amount of protein, and increased carbohydrates. The superficial mucosa cells were identifiable by the shape and distribution of granules containing neutral mucosubstances, which were found together with acid sialomucin-like mocusubstances in the region near the pyloric sphincter. Gastric glands, consisting exclusively of oxynticopeptic cells, were found only in the gastric corpus. These cells, such as described in the literature, secreted hydrochloric acid and protein, and their luminal surface was characterized by elongated cytoplasmic prolongations, a well-developed tubulovesicular system, and numerous zymogen granules. In eels fed the experimental diet, the intercellular spaces were dilated, and ultrastructural modifications were seen in the lysosomal system. There were many large autolysosomes containing cellular structures in different degrees of degeneration, eg, secretory granules, components of the endomembranous system, and clumps of pigment. Oxynticopeptic cells contained large intracellular cavities, and a complex tubulovesicular network was seen throughout the cytoplasm.
ISSN:0968-4328
1878-4291
DOI:10.1016/0968-4328(95)00031-3