The Journal of infectious diseases · 2008
Levels of interleukin-18 are markedly increased in Helicobacter pylori-infected gastric mucosa among patients with specific IL18 genotypes.
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Sakai Kyoko, Kita Masakazu, Sawai Naoki, Shiomi Satoshi, Sumida Yoshio, Kanemasa Kazuyuki, Mitsufuji Shoji, Imanishi Jiro, Yamaoka Yoshio
Аннотация
BACKGROUND: The cellular immune response in gastric mucosa infected with Helicobacter pylori is proposed to be predominantly of the T helper cell type 1 type.
METHODS: Interleukin (IL)-18, IL-12, and interferon (IFN)-gamma levels were measured in gastric mucosal biopsy specimens by reverse-transcription polymerase chain reaction (PCR) and by enzyme-linked immunosorbent assay; IL18 polymorphisms were determined by PCR.
RESULTS: Biopsy specimens from 128 patients (56 with nonulcer dyspepsia, 28 with gastric ulcers, 28 with duodenal ulcers, and 16 with gastric cancer) were examined; 96 patients had H. pylori infection. IL-18 levels were markedly up-regulated in mucosa infected with H. pylori (P < .001), whereas IL-12 and IFN-gamma levels were independent of H. pylori status. IL-18 levels correlated with IFN-gamma levels only in infected patients (R = 0.31 to R = 0.51). IL-18 levels were the determining factor for monocyte infiltration in H. pylori-infected mucosa (P < .001). H. pylori-infected patients displaying IL18 -607C/C and -137G/G had higher IL-18 levels than did those with other genotypes and were more likely to experience treatment failure.
CONCLUSION: H. pylori infection induces IL-18 in the gastric mucosa. H. pylori-infected patients with IL18 -607C/C and -137G/G have higher IL-18 levels, which causes severe gastric inflammation. IL18 genotype might be a marker for predicting the effects of eradication therapy.
METHODS: Interleukin (IL)-18, IL-12, and interferon (IFN)-gamma levels were measured in gastric mucosal biopsy specimens by reverse-transcription polymerase chain reaction (PCR) and by enzyme-linked immunosorbent assay; IL18 polymorphisms were determined by PCR.
RESULTS: Biopsy specimens from 128 patients (56 with nonulcer dyspepsia, 28 with gastric ulcers, 28 with duodenal ulcers, and 16 with gastric cancer) were examined; 96 patients had H. pylori infection. IL-18 levels were markedly up-regulated in mucosa infected with H. pylori (P < .001), whereas IL-12 and IFN-gamma levels were independent of H. pylori status. IL-18 levels correlated with IFN-gamma levels only in infected patients (R = 0.31 to R = 0.51). IL-18 levels were the determining factor for monocyte infiltration in H. pylori-infected mucosa (P < .001). H. pylori-infected patients displaying IL18 -607C/C and -137G/G had higher IL-18 levels than did those with other genotypes and were more likely to experience treatment failure.
CONCLUSION: H. pylori infection induces IL-18 in the gastric mucosa. H. pylori-infected patients with IL18 -607C/C and -137G/G have higher IL-18 levels, which causes severe gastric inflammation. IL18 genotype might be a marker for predicting the effects of eradication therapy.
Предметные рубрики MeSH
AdultAgedAged, 80 and overAnti-Bacterial AgentsDuodenal UlcerDyspepsiaFemaleGastric MucosaGenetic MarkersGenetic Predisposition to DiseaseGenotypeHelicobacter InfectionsHelicobacter pyloriHumansInterferon-gammaInterleukin-12Interleukin-18MaleMiddle AgedPolymorphism, GeneticStomach NeoplasmsStomach Ulcer