PubMed · 13060550
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H KLEIN, J B KIRSNER, H FORD, W L PALMER. 1953. Prolonged post-medication anacidity.. https://pubmed.ncbi.nlm.nih.gov/13060550/
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Development of noninvasive methods for the diagnosis of Helicobacter pylori infection is an important problem. We investigated the possibility of detecting the bacterium in gastric juice. Noninvasive methods (bacteriological and urease test) for detection of H. pylori in gastric aspiration biopsy specimens are proposed.
The gastric juice of Helicobacter pylori-infected individuals contains substantially higher levels of phospholipase A2 (PLA2) than that of individuals who are not infected. We present a new theory for how this H. pylori-induced PLA2 activity in gastric juice may play a major role in the development of peptic ulcer disease. When activated at neutral pH (pH 6.5-7.0), PLA2 may damage the surfactant-like, phospholipid-rich layer which constitutes an important part of the mucus barrier. Pepsin and other proteases, activated at low pH (pH 1.0-3.5), may then denature and cleave PLA2-exposed proteins. Peptic ulcers therefore tend to develop in regions exposed to changing luminal pH, such as the duodenal bulb when acid production is high or normal, or in the stomach when acid secretion is low.