Jinglei Wang,1 Dehong Qiao,2 Yunzhu Wang,3 Rui Xiong,1 Xinyi Ding,1 Wei Zhang,3 Tingting Wang,1 Kai Tang1 

1Department of Gastroenterology, Zhejiang Rongjun Hospital, Jiaxing, People’s Republic of China; 2Minimally Invasive Diagnosis and Treatment Center, Zhejiang Rongjun Hospital, Jiaxing, People’s Republic of China; 3Endoscopy Center, Zhejiang Rongjun Hospital, Jiaxing, People’s Republic of China

Correspondence: Kai Tang, Department of Gastroenterology, Zhejiang Rongjun Hospital, Jiaxing, People’s Republic of China, +86 15858363565, Email 15858363565@sohu.com

Purpose: Helicobacter pylori (Hp)-related gastropathies are accompanied by alterations in gastric secretion function, but the effects of infection of different Hp strains on gastric function are not yet well-elucidated. Our cross-sectional clinical study aim to research the effects of infection with different Hp types on gastric function.
Patients and Methods: We analyzed 525 patients’ serum cytotoxin-associated protein gene A (CagA), vacuolating cytotoxin-associated protein gene A (VacA), urease (Ure), Gastrin-17 (G-17), Pepsinogen I (PGI), Pepsinogen II (PGII) and PGI/PGII ratio (PGR).
Results: The PGII levels (8.19 ± 5.44 vs 5.98 ± 10.75, P = 0.013) were higher in the Hp infected group than in the uninfected, while the PGR levels (16.81 ± 8.22 vs 23.23 ± 8.36, P < 0.001) were lower. The PGR levels were higher in the uninfected group (23.23 ± 8.36, P < 0.001) than in Hp-I (16.47 ± 7.45) and Hp-II infected groups (17.39 ± 8.98). In the uninfected group, the G-17 level was positively correlated with the levels of PGI (Pearson coefficient = 0.177, P = 0.001), PGII (Pearson coefficient = 0.140, P = 0.008) and age (Pearson coefficient = 0.121, P = 0.022), negatively with the PGR levels (Pearson coefficient = − 0.201, P < 0.001). In the Hp-I (Pearson coefficient = − 0.003, P = 0.975) and Hp-II (Pearson coefficient = 0.018, P = 0.161) infected groups, the G-17 levels were not correlated with age.
Conclusion: Hp-I with CagA and/or VacA positive and Hp-II without cytotoxicity can reduce gastric secretion function regardless of age and sex. Gastric function in patients with Hp eradication was similar to that in those without Hp infection. G-17 rises physiologically with age, but infection with Hp will affect it.

Keywords: Helicobacter pylori, Pepsinogen I, Pepsinogen II, Gastrin-17, cytotoxin-associated protein gene A, vacuolating cytotoxin-associated protein gene A