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. 1997 Sep;4(5):540–544. doi: 10.1128/cdli.4.5.540-544.1997

Reactivities of Lewis antigen monoclonal antibodies with the lipopolysaccharides of Helicobacter pylori strains isolated from patients with gastroduodenal diseases in Japan.

K Amano 1, S Hayashi 1, T Kubota 1, N Fujii 1, S Yokota 1
PMCID: PMC170591  PMID: 9302202

Abstract

We have examined the reactivity of monoclonal antibodies (MAbs) specific for Lewis antigens (Le(x), Le(y), Le(a), and Le(b)) with Helicobacter pylori lipopolysaccharides (LPS) by immunoblot analysis and enzyme-linked immunosorbent assay (ELISA). Sixty-eight strains of H. pylori were isolated from patients with chronic gastritis, gastric and duodenal ulcers, and gastric cancer in Japan. The cells were treated with proteinase K, and the resulting fractions were used as a source of LPS for the immunoassays. In the immunoblot analysis, 28 isolates (41%) and 29 isolates (42%) reacted with anti-Le(x) and anti-Le(y) MAbs, respectively, while 4 isolates (6%) and 7 isolates (10%) reacted with anti-Le(a) and anti-Le(b) MAbs. On the other hand, in ELISA, the number of isolates that reacted with anti-Le(x) MAbs fell significantly to 21 isolates (30%) but the number of isolates that reacted with the other anti-Lewis antigen MAbs remained relatively unchanged. These data show that the immunoblotting technique is more sensitive than the ELISA technique for the detection of immunocomplexes of anti-Le(x) MAbs and components of H. pylori LPS. Furthermore, human serum was found to react with the synthetic Lewis antigens regardless of the status of the individual's H. pylori infection. This means that humans may naturally possess antibodies against Lewis antigens in the absence of H. pylori infection.

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Selected References

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