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Coexpression of Interleukin-8 and Inducible Nitric Oxide Synthase in Gastric Mucosa Infected with cagA+ Helicobacter pylori

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Abstract

The cagA-positive Helicobacter pylori strains are thought to be able to induce interleukin-8 expression and to be associated with gastroduodenal diseases. Inducible nitric oxide synthase (iNOS) may be involved in inflammatory pathogenesis. Our aim was to investigate the interrelationships between cagA and the expression of interleukin-8 and iNOS messenger RNAs, and with the type and degree of inflammation in gastric mucosa. In biopsies from 108 Chinese patients, the cagA, 16S rRNA, interleukin-8, and iNOS mRNAs were analyzed using reverse-transcription polymerase chain reaction. Specimens infected with cagA-positive strains had significantly more severe infiltration by mononuclear and polymorphonuclear leukocytes and more frequently expressed interleukin-8 and iNOS mRNAs than those infected with cagA-negative strains. iNOS and interleukin-8 mRNAs were significantly more frequently expressed together in the specimens with moderate or severe inflammation than in those with normal mucosa or mild inflammation. Our data suggest that interleukin-8 and excess nitric oxide play important roles in the pathogenesis of H. pylori-associated gastroduodenal diseases.

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Li, CQ., Pignatelli, B. & Ohshima, H. Coexpression of Interleukin-8 and Inducible Nitric Oxide Synthase in Gastric Mucosa Infected with cagA+ Helicobacter pylori. Dig Dis Sci 45, 55–62 (2000). https://doi.org/10.1023/A:1005453125433

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