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The gastric mucosal adhesiveness of Z-103 in rats with acetic acid ulcer was studied macroscopically, histologically, and biochemically. From macroscopical observations, when Z-103 was orally administered to an acetic acid ulcer model, there was adhesion of Zn to the normal mucosa as well as the ulcerous site under both the fasting condition and after feeding. It was also proven that the strength and duration of adhesiveness were increased dose-dependently under fasting conditions. In addition, histological localization of Zn was noted from the covering epithelial cell layer to the gastric lamina propria mucosae in the normal tissue and in the most superficial ulcerous layer and the granulous layer of the ulcerous site. Measurement of the gastric tissue Zn content after oral administration of 100 mg/kg of Zn showed that the Zn content was significantly increased for 6 hr at the normal site and for 24 hr at the ulcerous site. On the other hand, although ZnSO4 and ZnSO4+carnosine combination macroscopically produced generally the same level of adhesiveness as Z-103, when the gastric tissue Zn content for Z-103 and ZnSO4 were compared, the Zn content of ZnSO4 was lower than that for Z-103 at both the normal and ulcerous site. In summary, Z-103 shows a long-term adhesive and permeable action on the gastric mucosa in acetic acid ulcer rats, and it has a comparable high affinity at the ulcerous site.

The gastric mucosal adhesiveness of Z-103 in rats with chronic ulcer.