Beta-2-microglobulin and Helicobacter pylori infection in uraemic dialysed patients.

Chronic gastritis in patients with chronic renal failure may have different causes and mechanisms. Recent observations suggest that severe gastritis often found in uraemic patients might be related to Helicobacter pylori (HP) infection. In chronic gastritis HP has been found in the mucus and on the epithelial cell surface of gastric foveolas. Significant infiltration of the subepithelial gastric layer by polymorphonuclear leucocytes has been described. Moreover, beta-2-microglobulin deposits have been found by immunohistochemical methods in the subepithelial layer of gastric mucosa of uraemic dialysed patients with active chronic gastritis and HP infection. Similar findings have also been demonstrated in gastric biopsies from patients with HP positive active chronic gastritis and normal renal function. Since HP infection is associated with significant leucocyte infiltration, it is hypothesized that the inflammatory process causes the release of beta-2-M from the surface of the leucocytes and its subsequent deposition at gastric level.