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ZJUS-B
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology)  2014, Vol. 15 Issue (5): 500-506    DOI: 10.1631/jzus.B1300171
Articles     
Expression of three essential antioxidants of Helicobacter pylori in clinical isolates
Yan-yan Shi, Mo Chen, Yue-xia Zhang, Jing Zhang, Shi-gang Ding
Department of Gastroenterology, Peking University Third Hospital, Beijing 100191, China
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Abstract  Objective: Helicobacter pylori maintains long-term persistence in the host and combats oxidative stress via many antioxidant proteins, which are expected to be relevant to bacterial-associated gastric diseases. We aimed to investigate the expression of three essential antioxidants in H. pylori strains isolated from patients with different clinical outcomes. Methods: Forty H. pylori strains were isolated from endoscopic biopsy specimens of gastric mucosa from 13 patients with gastric cancer, 13 with peptic ulcer, and 14 with gastritis. The expression of thioredoxin 1 (Trx1), arginase (RocF), and alkyl hydroperoxide reductase (AhpC) in H. pylori was measured by real-time PCR. Comparisons among multiple sample sets were analyzed using a one-way ANOVA test. Pearson’s correlation test was used to assess relationships among multiple continuous variables. Results: Trx1 expression of H. pylori in gastric cancer and peptic ulcer tissues was higher than that in tissues with gastritis. RocF expression of H. pylori in gastric cancer tissues was higher than that in tissues exhibiting peptic ulcer and gastritis. However, we did not find any differences in AhpC expression in samples from patients with different clinical outcomes. The expression of Trx1 and RocF had a positive, linear correlation. The expression of Trx1 and AhpC had a positive correlation without a linear trend. We found no correlation between the expression of RocF and AhpC. Conclusions: Our observations indicate that the expression of Trx1 and RocF in H. pylori might be related to gastric carcinogenesis. In H. pylori, the expression of members of the antioxidant system may be correlated and relevant to gastric cancer.

Key words： Antioxidant      Gastric cancer      Helicobacter pylori      Oxidative stress     
Received: 23 June 2013      Published: 05 May 2014
CLC:  R735.2  
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Yan-yan Shi
Jing Zhang
Mo Chen
Yue-xia Zhang
Shi-gang Ding
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Yan-yan Shi, Mo Chen, Yue-xia Zhang, Jing Zhang, Shi-gang Ding. Expression of three essential antioxidants of Helicobacter pylori in clinical isolates. Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2014, 15(5): 500-506.

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http://www.zjujournals.com/xueshu/zjus-b/10.1631/jzus.B1300171     OR     http://www.zjujournals.com/xueshu/zjus-b/Y2014/V15/I5/500

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