1887

Abstract

Surmmary

is important in the aetiology of peptic ulceration. Despite inducing an inflammatory response in the mucosa, the organism persists, suggesting that it has efficient protective mechanisms. Some bacterial and viral products modulate histamine secretion from inflammatory cells. Therefore, this study examined the modulatory effects of preparations on histamine release from rat peritoneal mast cells and human basophils. Eleven clinical isolates of were prepared in different ways: As whole washed bacteria, washed sonicated bacteria, and formalin-killed bacteria, and as outermembrane and lipopolysaccharide (LPS) extracts. Histamine release from mast cells or basophils was not elicited by any of these bacterial preparations alone. However, when mixed with various secretory stimulants, the bacterial preparations caused inhibition of histamine release from rat mast cells (calcium ionophore A23187, compound 48/80, concanavalin A, anti-rat IgE) and human basophils (A23187, -formyl Met-Leu-Phe). The degree of inhibition ranged from 48% to 97%. These results indicate that exerts an inhibitory effect on cells of the immune system that contributes to its persistence within the gastric mucosa.

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1995-06-01
2024-06-19
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