Gastric epithelial cell CXC chemokine secretion following Helicobacter pylori infection in vitro.
OBJECTIVE
Helicobacter pylori infection of the stomach is commonly associated with infiltration of neutrophils. Gastric epithelial cells are recognized as central mediators of tissue responses to this organism. The aim of the present study was to ascertain patterns of production of three neutrophil chemoattractant chemokines following infection of gastric epithelial cells with H. pylori in vitro.


METHODS
Two gastric cancer-derived epithelial cell lines were infected with H. pylori organisms of previously defined cagE and cagA status for periods of up to 24 h. The production of three chemokines (interleukin [IL]-8, epithelial neutrophil activating protein [ENA]-78 and growth-related oncogene [GRO]-alpha) over this time was measured in culture supernatants using immunoassays.


RESULTS
Both IL-8 and GRO-alpha were produced by both AGS and KATO-III cells in response to H. pylori infection, and in a cag PAI-dependent manner. ENA-78, however, was not increased following H. pylori infection.


CONCLUSIONS
GRO-alpha is expressed by epithelial cells following H. pylori infection along with IL-8. Both may contribute to neutrophilic infiltration present in gastric mucosa associated with H. pylori infection. In contrast, H. pylori infection does not lead to an increased synthesis of ENA-78, suggesting that this may not be as important in vivo.
School of Biotechnology, University of New South Wales, Sydney, Australia.
Daniel
D
Sieveking
Hazel M
HM
Mitchell
Andrew S
AS
Day
D000704:Analysis of Variance; D002460:Cell Line; D054360:Chemokine CXCL1; D054365:Chemokine CXCL5; D019743:Chemokines, CXC / Q000378:metabolism*; D004797:Enzyme-Linked Immunosorbent Assay; D005753:Gastric Mucosa / Q000378:metabolism* / Q000382:microbiology; D016481:Helicobacter Infections / Q000378:metabolism*; D016480:Helicobacter pylori; D006801:Humans; D066298:In Vitro Techniques; D036341:Intercellular Signaling Peptides and Proteins / Q000378:metabolism*; D016209:Interleukin-8 / Q000378:metabolism*; D014407:Tumor Cells, Cultured
C475829:CXCL1 protein, human; C486263:CXCL5 protein, human; D054360:Chemokine CXCL1; D054365:Chemokine CXCL5; D019743:Chemokines, CXC; D036341:Intercellular Signaling Peptides and Proteins; D016209:Interleukin-8