Title CagL polymorphisms between East Asian and Western Helicobacter pylori are associated with different abilities to induce IL-8 secretion
Author Yun Hui Choi1†, Jing Lai1†, Myeong-A Kim1, Aeryun Kim1, Jinmoon Kim1, Hanfu Su2*, Linhu Ge2*, and Jeong-Heon Cha1,2*
Address 1Department of Oral Biology, Oral Science Research Center, Department of Applied Life Science, the Graduate School, BK21 FOUR Project, Yonsei University College of Dentistry, Seoul 03722, Republic of Korea, 2Affiliated Stomatology Hospital of Guangzhou Medical University, Guangzhou Key Laboratory of Basic and Applied Research of Oral Regenerative Medicine, Guangzhou, Guangdong 510182, P. R. China
Bibliography Journal of Microbiology, 59(8),763–770, 2021,
DOI 10.1007/s12275-021-1136-2
Key Words Helicobacter pylori, type IV secretion system, CagL, polymorphism
Abstract Helicobacter pylori colonizes human gastric mucosa. Its infection is associated with gastric diseases including gastric cancer. CagA is one of the most important toxins produced by H. pylori. It is related to gastric cancer which can be injected into host cells via a type IV secretion system (T4SS). CagL is a structural component of T4SS apparatus, which triggers host cell signaling pathway. It has been reported that CagL polymorphisms may influence the severity of disease development. To explore the contribution of CagL polymorphisms between East Asian and Western H. pylori in pathogenesis, cagL gene in G27 H. pylori was swapped by K74 cagL which is identical to East Asian CagL consensus sequence and by Western 26695 H. pylori, resulting in G27ΔcagL/cagLK74 and G27ΔcagL/cagL26695, respectively. Intriguingly, G27ΔcagL/ cagLK74 showed significantly less ability of IL-8 induction than G27ΔcagL/cagL26695 while displayed similar abilities of CagA phosphorylation, and cell elongation. Taken together, this study suggests that the CagL polymorphism may influence IL-8 induction, and K74 CagL has less ability to induce IL-8 secretion than G27 or 26695 CagL. Further research should address how the different capabilities of IL-8 induction between intraspecies-CagL are associated with the large differences of the incidence of gastric cancer between East Asian and Western countries.