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. 1998 Sep;43(3):322–326. doi: 10.1136/gut.43.3.322

The relation between gastric vitamin C concentrations, mucosal histology, and CagA seropositivity in the human stomach

Z Zhang 1, S Patchett 1, D Perrett 1, P Katelaris 1, P Domizio 1, M Farthing 1
PMCID: PMC1727232  PMID: 9863475

Abstract

Background—Vitamin C may be protective against gastric cancer though infection with Helicobacter pylori is associated with a reduction in intragastric concentrations of vitamin C. 
Aims—To examine the effects of H pylori infection, gastric juice pH, the severity and extent of gastric inflammation, and CagA antibody status of the individual on gastric juice and mucosal vitamin C concentrations. 
Patients—One hundred and fifteen patients undergoing routine gastroscopy for investigation of dyspepsia. 
Methods—High performance liquid chromatography was used to determine vitamin C concentrations. CagA antibody was detected by western blot analysis. 
Results—Gastric juice ascorbic acid concentration was significantly lower in patients infected with H pylori compared with those uninfected (19.3 µmol/l (interquartile range (IQR) 10.7-44.5) versus 66.9 µmol/l (IQR 24.4-94.2), p=0.003). The reduction in gastric juice ascorbic acid concentration was inversely related to the severity of gastritis (p=0.01). CagA positive patients had significantly lower gastric juice ascorbic acid concentrations than CagA negative ones (14.8 µmol/l (IQR 7.9-52.2) versus 39µmol/l (IQR 19.9-142.2), p=0.05). Decreased gastric juice dehydroascorbic acid concentrations were observed in patients with gastric atrophy and intestinal metaplasia. Mucosal ascorbic acid concentrations were also significantly lower in infected patients than uninfected patients (p=0.04). 
Conclusions—The reduction in gastric vitamin C concentrations is related to gastric juice pH, the severity and extent of gastritis, the presence of H pylori, and the CagA antibody status of the individual. These findings may have implications in H pylori associated carcinogenesis. 



Keywords: ascorbic acid; Helicobacter pylori; gastric juice; gastric mucosa; premalignancy

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Figure 1 .

Figure 1

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H pylori infection related to gastric juice ascorbic acid and DHA concentrations (Mann-Whitney U test). 


Figure 2 .

Figure 2

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CagA antibody status related to gastric juice ascorbic acid concentrations. (Mann-Whitney U test and Kruskal-Wallis one way ANOVA). 


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