The role of Helicobacter pylori urease in the pathogenesis of gastritis and peptic ulceration.
Level 5 - mechanism / opinion, no new human data
Mechanistic review and biochemical description without original human clinical or epidemiological data
PubMed 8730260 · doi:10.1046/j.1365-2036.1996.22164006.x
What was done
This paper summarizes the structural biology, genetics, and pathogenic mechanisms of Helicobacter pylori urease based on existing biochemical and microbiological evidence.
What was found
The abstract reports no quantitative clinical trial or observational outcome metrics. It details that H. pylori urease is a 550 kDa multimeric, nickel-containing enzyme composed of six UreA (26.5 kDa) and six UreB (60.3 kDa) subunits encoded by a seven-gene cluster (ureA–ureH). Mechanistically, urease catalyzes urea hydrolysis into ammonia and carbonic acid, allowing acid neutralization, bacterial protein synthesis, immune evasion via enzyme shedding, and host tissue injury through direct ammonia toxicity and leukocyte/neutrophil activation.
Why it matters
It outlines how urease acts as both a survival factor against gastric acidity and a key virulence factor driving the pathogenesis of gastritis and peptic ulcer disease.
Limits
The abstract contains no empirical clinical trial, patient cohort, or quantitative experimental data, functioning entirely as a descriptive mechanistic overview. In vivo human correlations and strain-specific differences are not reported.
Cited by
- supports Helicobacter pylori is present in 80% of the population and releases alkaline ammonia to make its environment more alkaline.