Local immune defence in relation to gastritis in Billroth-II-resected stomachs.

Biopsy specimens from Billroth-II-resected stomachs obtained endoscopically 28-32 years after the operation were subjected to an immunohistochemical study by two-colour immunofluorescence staining. The epithelial distribution of immunoglobulin A (IgA), secretory component (SC), lysozyme (Ly), and lactoferrin (Lf) was evaluated, and IgA-, IgM-, and IgG-producing cells were quantified in the lamina propria. Gastric body mucosa excised from resected stomachs obtained from patients with duodenal ulcer was used as control and showed considerably less extensive gastritis than the stump mucosa. Both specimen categories showed enhanced expression of epithelial IgA, SC, Ly, and Lf associated with severe gastritis, except for areas with intestinal metaplasia, which lacked Ly and Lf. The number of IgA-, IgM-, and IgG-producing cells was significantly increased with increasing degree of gastritis, particularly so for IgG cells on a relative basis. After partial gastrectomy, therefore, the stump mucosa generally responds with activation of local immune mechanisms; this response is principally similar to that seen in simple gastritis of comparable severity.