ArticleProceedings of the National Academy of Sciences of the United States of America2000
A M(r) 34,000 proinflammatory outer membrane protein (oipA) of Helicobacter pylori.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2000. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Cited by 204 papers, 2 of them syntheses that pooled it.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
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Who cites it
204 citing papers in PubMed, 2 syntheses or guidelines pooled it.
- Infiltration to infection: key virulence players of Helicobacter pylori pathogenicity.Infection · 2024Pooled it
- Association of presence/absence and on/off patterns of Helicobacter pylori oipA gene with peptic ulcer disease and gastric cancer risks: a meta-analysis.BMC infectious diseases · 2013Pooled it
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- Bacteria and Carcinogenesis and the Management of Cancer: A Narrative Review.Pathogens (Basel, Switzerland) · 2025Review
- Helicobacter pylori, microbiota and gastric cancer - principles of microorganism-driven carcinogenesis.Nature reviews. Gastroenterology & hepatology · 2025Review
- The Effect ofPathogens (Basel, Switzerland) · 2025Article
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- Study of the relationships among known virulence genes, coccoid transformation and cytotoxicity ofVirulence · 2024Article
- Influence of Cytokine Genetic Polymorphisms inGut and liver · 2024Article
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- Implications of lncRNAs inFrontiers in cellular and infection microbiology · 2024Review
- Effect of the switch status of Helicobacter pylori outer inflammatory protein A on gastric diseases.AMB Express · 2023Article
- Comparative genomics of two Vietnamese Helicobacter pylori strains, CHC155 from a non-cardia gastric cancer patient and VN1291 from a duodenal ulcer patient.Scientific reports · 2023Article
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- Pathogenomics of Helicobacter pylori.Current topics in microbiology and immunology · 2023Review
- Gastric Stem Cell Biology and Helicobacter pylori Infection.Current topics in microbiology and immunology · 2023Article
144 more citing papers are in PubMed but not listed here.
Corrections and comments
- Erratum issued
Authors and funding
3 authors.
Funding
Abstract
The complete genome sequence revealed a family of 32 outer membrane proteins (OMPs) in Helicobacter pylori. We examined the effect of four OMPs (HP0638, HP0796, HP1501, and babA2) on the production of the proinflammatory cytokine, IL-8. Mutants of the four OMPs, as well as cagE and galE from H. pylori from the U.S. and Japan, were constructed by inserting a chloramphenicol-resistant cassette into the gene. Twenty-two pairs of parental and mutant H. pylori strains, as well as 160 clinical isolates (80 from Japanese and 80 from U.S.), were cocultured with gastric cancer cell lines. IL-8 production in the supernatant and adhesion was assayed by ELISA. HP0796, HP1501, babA2, and galE gene knockouts had no significant effect on IL-8 production. Knockout of the HP0638 gene in 81% of cag-positive strains reduced IL-8 production approximately 50%. The three cag-positive strains in which IL-8 levels were unchanged by HP0638 knockout had five or seven CT dinucleotide repeats in the 5' region, resulting in a frame shift and truncation. Strains with naturally inactive HP0638 gene were all from the U.S.; Japanese strains were always "on" and thus, on average, may be more virulent. Although cag-negative isolates produced a limited IL-8 response, cag-negative strains that contained a functional HP0638 gene produced more than 3-fold greater IL-8 than cag-negative nonfunctional HP0638 strains. We hypothesize that functional HP0638 gene may be an important virulence factor in relation to the risk of clinically significant outcomes of H. pylori infection. We denote HP0638 gene as outer inflammatory protein (oipA).
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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.