Relation between clinical presentation, Helicobacter pylori density, interleukin 1beta and 8 production, and cagA status.


BACKGROUND It is not known whether cagA+ Helicobacter pylori in duodenal ulcer (DU) have enhanced virulence compared with non-DU cagA+ H pylori. AIMS To investigate the relation between presentation, H pylori density, interleukin 1beta (IL-1beta) and IL-8 production, and cagA status. METHODS Fifty DU and 50 gastritis patients with cagA+ H pylori and 11 with cagA- infections were studied. Bacterial density and cytokine production were assessed using the same biopsies. Cytokine production was also measured from supernatants of medium following coculture of H pylori with MKN-45 cells. RESULTS There was no relation between H pylori density and cagA status. There was a dose dependent relation between mucosal cytokine levels and density of cagA+ H pylori. H pylori density increased to a threshold, followed by a rapid increase in cytokines and then a plateau. IL-1beta and IL-8 levels in the antrum were greater in DU than in gastritis; in the corpus the cytokine level/H pylori differed irrespective of similar H pylori densities. However, cytokine production was similar in vitro, independent of presentation or biopsy site, suggesting that host factors are critical determinants of the inflammatory response. Mucosal IL-8 and IL-1beta levels were low with cagA- and cagA+, cagE- H pylori infections. CONCLUSIONS The increase in antral IL-1beta and IL-8 production and inflammation in DU is related to increased numbers of bacteria and not to an increase in cytokine production per cagA+ isolate. There was no evidence of enhanced virulence of H pylori from DU compared with cagA+ non-DU H pylori.

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@article{Yamaoka1999RelationBC, title={Relation between clinical presentation, Helicobacter pylori density, interleukin 1beta and 8 production, and cagA status.}, author={Yoshio Yamaoka and Tetsuya Kodama and Masakazu Kita and Jiro Imanishi and Kenji Kashima and David Graham}, journal={Gut}, year={1999}, volume={45 6}, pages={804-11} }