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Relationship between mucosal levels of interleukin 8 and toxinogenicity of Helicobacter pylori

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Abstract

Aim of study: To investigate if an association exists between in-vivo mucosal levels of IL-8 and bacterial expression of cytotoxin and cagA gene of H. pylori.

Methods: Seventy-two dyspeptic patients referred for endoscopy were studied, including 36 patients with peptic ulcer (PU) and 36 with non-ulcer dyspepsia (NUD). Biopsies were taken for histology, H. pylori culture and measurement of IL-8 by ELISA. To test the ability of H. pylori to produce cytotoxin (VacA), broth culture supernatants were assayed on Vero cells and vacuolation measured. PCR was used to detect the cagA gene of H. pylori.

Results: H. pylori was isolated in 52 of 72 patients studied. Among the 52 strains, 25 (49%) were VacA+ve/cagA+ve; 12 (23%) were VacA−ve/cagA−ve; the remaining 15 strains (28%) were either VacA+ve/cagA−ve or VacA−ve/cagA+ve. IL-8 levels (median (interquartile) pg/mg) in patients infected with VacA+ve (1.5 (0.64, 2.84)) or cagA+ve strains (1.25 (0.72, 2.34) were significantly higher than in those with VacA−ve (0.76 (0.4, 1.0)) or cagA−ve strains (0.5 (0.4, 1.5); p<0.05). The neutrophil infiltration score was also higher in patients infected with VacA+ve or cagA+ve strains than in those infected with VacA−ve or cagA−ve strains (p<0.05).

Conclusion: VacA+ve/cagA+ve strains were associated with an enhanced production of mucosal IL-8 in vivo and correlated with a stronger infiltration of neutrophils. Enhanced mucosal production of IL-8 and its role in neutrophil chemotaxis and activation could be important in H. pylori-induced gastroduodenal inflammation and in the development of peptic ulcer disease.

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Authors and Affiliations

  1. Department of Gastroenterology, University of Glasgow NHS Trust, Glasgow, UK

    Q. B. Zhang, G. Etolhi, J. B. Dawodu & R. I. Russell

  2. Department of Bacteriology, University of Glasgow NHS Trust, Glasgow, UK

    Q. B. Zhang & C. G. Gemmell

  3. Department of Pathology, Royal Infirmary, University of Glasgow NHS Trust, Glasgow, UK

    A. Husain

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  1. Q. B. Zhang
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  2. G. Etolhi
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  5. C. G. Gemmell
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Zhang, Q.B., Etolhi, G., Dawodu, J.B. et al. Relationship between mucosal levels of interleukin 8 and toxinogenicity of Helicobacter pylori . Inflammopharmacol 6, 109–117 (1998). https://doi.org/10.1007/s10787-998-0028-y

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  • DOI: https://doi.org/10.1007/s10787-998-0028-y

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