Lipids of human gastric mucosa: effect of Helicobacter pylori infection and nonalcoholic cirrhosis.

BACKGROUND/AIMS: Gastric mucosa phospholipids play an important protective role against exogenous and endogenous toxic agents. Recently, we described a significant alteration of phospholipid profile in patients with chronic atrophic gastritis without Helicobacter pylori infection. The aim of the present study was to assess the phospholipid composition of gastric biopsy specimens in 41 subjects with chronic gastritis in relation to H. pylori infection (no. 26) and nonalcoholic cirrhosis (no. 18).

METHODS

Phospholipids were extracted from homogenate mucosal samples using Folch's method, purified, and separated by thin-layer chromatography, while bound fatty acids were analyzed by gas liquid chromatography.

RESULTS

The amounts of five gastric phospholipid classes, their rank order, and percent distribution of the principal ones (phosphatidylcholine [PC] 58%, phosphatidylethanolamine [PE] 26%, and phosphatidylinositol 11% vs. values of 49, 19, and 14, respectively, in the earlier study) were confirmed in chronic gastritis without H. pylori infection. H. pylori infection induced a dramatic reduction (about 30%) in the absolute amount of total phospholipids (24.2 micrograms/mg protein versus 35.1 of the H. pylori-negative group; P < 0.01), PC and PE being the most affected (-36% and -26%, respectively), while bound fatty acids remained unchanged. There was no difference in cirrhotic vs. noncirrhotic subjects.

CONCLUSIONS

(1) The development of gastritis is characterized by an alteration of the lipid mucosal pattern that can change with the different etiologies, the most dramatic variations being observed in the presence of H. pylori infection; and (2) cirrhosis does not affect further the alteration in the phospholipid profile of the antral mucosa caused by chronic gastritis.