As the lecture of Predisent of the 50th Spring Meeting of the Japanese Electrophoresis Society, covered the own group's research field during the past about 20 years periods. Basic aspect and clinical significance of pepsinogens were reviewed. Contents of the lecture were the cellular localization of pepsinogen granules in the one cell, the activation mechanism of it, the entire human pepsinogen A and C genes, and the nucleotide sequence of all the exon and the 5'-and 3'-flanking regions. Topics of isozymes of human pepsinogen A (I), the schema of pepsinogen-producing mechanisms from mRNA, and electrophoretic pattern of pepsinogen A (I) from human gastric mucosa using agargel, were included. On the other hand, as for the clinical significance of pepsinogens, the first case report of pepsinogen producing gastric carcinoma with high pepsinogen II levels in both serum and ascites, and pepsinogen I and II immunohistochemical staining in gastric carcinoma tissues using the monoclonal antibodies, were presented. Finally, the clinical application of the serum pepsinogen levels in the research of Helicobacter pylori infection, gastric cancer development in the course of carcinogenesis from atrophic gastritis to gastric cancer in the population level, gastric cancer screening using serum pepsinogen test kits, which were commercially available now in Japan, and the significance of low serum pepsinogen levels to detect stomach cancer associated with extentive chronic gastritis, which was a precancerous condition of gastric cancer, were discussed.
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