MODULATORY ACTION OF HELICOBACTER-PYLORI ON HISTAMINE-RELEASE FROM MAST-CELLS AND BASOPHILS IN-VITRO

D.A. Lutton, K.B. Bamford, B. Oloughlin, Madeleine Ennis

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Helicobacter pylori 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 H. pylori preparations on histamine release from rat peritoneal mast cells and human basophils. Eleven clinical isolates of H. pylori were prepared in different ways: as whole washed bacteria, washed sonicated bacteria, and formalin-killed bacteria, and as outer-membrane 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, N-formyl Met-Leu-Phe). The degree of inhibition ranged from 48 % to 97 %. These results indicate that H. pylori exerts an inhibitory effect on cells of the immune system that contributes to its persistence within the gastric mucosa.
Original languageEnglish
Pages (from-to)386-393
Number of pages8
JournalJournal of Medical Microbiology
Volume42
Publication statusPublished - 1995

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