Phospholipases A2 in gastric juice of Helicobacter pylori--positive and negative individuals.
Gastric juice is known to have phospholipase A2 catalytic activity. Helicobacter pylori (H. pylori) has been reported to produce phospholipase A2, which is believed to hydrolyse the protective layer of gastric mucosal phospholipids and to promote mucosal damage. The current study aimed at identifying secretory phospholipase A2 subtypes (pancreatic group I phospholipase A2 and synovial-type group II phospholipase A2) in gastric juice and their relation to the presence of H. pylori in gastric mucosal biopsies in the same individuals. Gastric juice was collected from 29 individuals during gastroscopy. Biopsies were taken from the antrum and body of the stomach to determine the H. pylori status. We found catalytically active phospholipase A2 and both group I and group II phospholipases A2 in the gastric juice samples. The catalytic activity and the mass concentrations of group I and group II phospholipases A2 correlated significantly with the pH value in gastric juice. The gastric juice of H. pylori positive individuals did not contain higher amounts of phospholipases A2 than the juice of H. pylori negative individuals. Rather, the mass concentration of group II phospholipase A2 in gastric juice seemed to be somewhat lower in individuals with H. pylori infection than in uninfected individuals. The results of the current study show that both group I and group II phospholipases A2 are present in gastric juice. The main sources of phospholipases A2 in gastric juice are probably other than H. pylori.
Huhtinen
H T
HT
Department of Surgery, University of Turku, Finland.
Grönroos
J M
JM
Haapamäki
M M
MM
Nevalainen
T J
TJ
D000328:Adult; D000368:Aged; D002384:Catalysis; D005260:Female; D005750:Gastric Juice / Q000201:enzymology*; D016481:Helicobacter Infections / Q000201:enzymology* / Q000382:microbiology; D016480:Helicobacter pylori / Q000302:isolation & purification*; D006801:Humans; D006863:Hydrogen-Ion Concentration; D008297:Male; D008875:Middle Aged; D010741:Phospholipases A / Q000378:metabolism*; D054467:Phospholipases A2
D010741:Phospholipases A; D054467:Phospholipases A2