Histochemical distribution of mucosubstances in the gastric mucosae of Chinese meishan pigs.
1992
Kannan Y. | Maeda M. | Nanjo I. | Kanda J. | Mitsuishi N.
Gastric mucosae obtained immediately post-mortem from male Chinese Meishan pig of various ages were studied morphologically and histochemically. On morphological ground, the thickness of the gastric mucosae increased rapidly up to 90 days of age and then reached the value in adult pig at about 180 days of age. Histochemically, the presence of neutral mucosubstance and two types of acid mucosubstance, sulfomucin and sialomucin, were demonstrated in the gastric mucosal epithelium. In the cardiac gland region, neutral mucosubstance started to be accumulated at 7 days of age in the surface epithelium. The mucosubstance content remained at a high level between 30 and 120 days of age, and diminished slightly thereafter. Sulfomucin was abundantly contained in the surface epithelium at all ages examined, whereas sialomucin could hardly be detected. In the surface epithelium of the fundic gland region, neutral mucosubstance and sialomucin were progressively accumulated as the age of the animal advanced, and the contents of both these mucosubstances remained at relatively high levels during the period from 60 to 420 days of age. However, sulfomucin was moderately present only at 1 day of age in the surface epithelium. The distribution patterns of neutral mucosubstance and sialomucin in the surface epithelium of the pyloric gland region were similar to those of the fundic gland region. Moreover, in the pyloric gland region sulformucin was demonstrable mainly in the deep foveolar epithelium. In all three regions, the gastric galnds were well developed by at least 30 days of age, and the glandular epithelium contained distinctly neutral and acid mucosubstances after 60 days of age.
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