摘要：In order to establish the measurement of gastric mucin secreted from cultured mucous cells, rat gastric mucin was purified from secreted mucus with Sepharose CL-4B column chromatography. Gastric mucin was measured by dot blot analysis using an enzyme-linked lectin (soybean agglutiin) assay in a good concentration-dependent manner. Surface epithelical cells were dispersed by limited digestion of a rat everted stomach and collected by density gradient centrifugation with Percoll. These cells were inoculated onto gelled collagen dishes, then cultured in a medium supplemented with 10% fetal calf serum under a 5% CO2 atomosphere in air. Changing the medium after a 2-d culture, the cells were cultured for another 3 d. During the culture, the numbers of cells each day were almost, equal, but mucin contents in the cells increased, and then dropped at day 5 after inoculation. At that time, the edge of the cell layer peelede off and the cells adhered to each other. Using 2-d cultured cells, the effects of some secretagogues on mucin secretion were investigated. Carbachol, secretin, CCK-8 and prostaglandin E2 (PGE2) strongly stimulated mucin secretion, and gastrin I weakly did. However, histamine offered no stimulation.
