Studies on changes in lipid profiles of the rat gastric mucosa with stress ulcers.

Gastric mucosal lipid patterns were studied in normal and in restrained rats which developed mucosal erosions. Organic solvent extraction, silicic acid column, and thin-layer chromatography were employed to separate and gas-liquid chromatography and spectrophotometry to quantitize the individual lipid components. Chemical analysis revealed profound alterations in the mucosal lipid profiles of rats with gastric mucosal erosions. Cholesterol esters were markedly elevated, cholesterol, free fatty acids and phosphatidylethanolamine were markedly lower in the extracts of ulcerated tissue, and the titer of lysophospholipids was about eight times higher than in the controls. Lipid phosphorus was elevated in stressed rats. The amount of neutral glycolipids was similar for both groups, but tetra- and oligohexoside ceramides, which were present in the gastric mucosa of the control rats, were virtually absent from the ulcerated mucosa. In contrast to the alterations in lipid profile mentioned above, the total lipid weight per tissue preparation was very similar for the ulcerated and normal control groups.