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Helicobacter pylori induces an array of pro‐inflammatory cytokines in human gastric epithelial cells: Quantification of mRNA for interleukin‐8, ‐1α/β, granulocyte‐macrophage colony‐stimulating factor, monocyte chemoattractant protein‐1 and tumour necrosis factor‐α
Author(s) -
JUNG HYUN CHAE,
KIM JUNG MOGG,
SONG IN SUNG,
KIM CHUNG YONG
Publication year - 1997
Publication title -
journal of gastroenterology and hepatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.214
H-Index - 130
eISSN - 1440-1746
pISSN - 0815-9319
DOI - 10.1111/j.1440-1746.1997.tb00469.x
Subject(s) - monocyte , cytokine , interleukin 8 , biology , microbiology and biotechnology , tumor necrosis factor alpha , interleukin , helicobacter pylori , gastric mucosa , messenger rna , macrophage inflammatory protein , immunology , stomach , gene , biochemistry , genetics
Despite the fact that Helicobacter pylori is known to be non‐invasive, mucosal infiltration of inflammatory cells have been observed in the gastric mucosa. The exact pathogenesis of such an inflammatory reaction has not been well defined. We explored the repertoire of cytokine genes expressed in human gastric epithelial cells in response to coculture with H. pylori. After gastric epithelial cells, SNU‐5 and KATO III, were infected with H. pylori , expression of several cytokine genes was assessed using quantitative reverse transcription polymerase chain reaction. Interleukin (IL)‐8, ‐1α and ‐1β mRNA were expressed in both gastric epithelial cells throughout the entire infection period. In SNU‐5, IL‐1α and IL‐8 mRNA were expressed at 1 h, reached a peak level at 4 h and then decreased. Interleukin‐1β mRNA was expressed less frequently than IL‐1α or IL‐8 mRNA. In SNU‐5 cells, granulocyte‐macrophage colony‐stimulating factor (GM‐CSF), monocyte chemoattractant protein‐1 (MCP‐1), and tumour necrosis factor‐α (TNF‐α) mRNA were expressed at 9h, but was not expressed in KATO III. Gene expression paralleled the amount of IL‐8 protein measured by enzyme‐linked immunoabsorbent assay (ELISA). Interleukin‐8 mRNA expression was not observed in KATO III cells infected with Campylobacter fetus ssp. fetus, Campylobacter jejuni or Escherichia coli. IL‐8 mRNA expression was increased not only in gastric epithelial cells but also in non‐gastric cells infected with H. pylori. These results suggest that an inflammatory reaction induced by H. pylori may be initially triggered by an array of pro‐inflammatery cytokines expressed by infected gastric epithelial cells.