title: Helicobacter pylori with the Intact dupA Cluster is more Virulent than the Strains with the Incomplete dupA Cluster.
abstract: The duodenal ulcer promoting gene (dupA), located in the plasticity region of Helicobacter pylori (H. pylori), is predicted to form a type IV secretory system (T4SS) with vir genes around dupA. In the study, we investigated the association between the dupA cluster status and the virulence of H. pylori in a littoral region of Northeast China. Two hundred and sixty-two H. pylori strains isolated from the chronic gastritis were examined to evaluate the dupA cluster status, cag PAI genes and vacA genotype using PCR and Western blot. Histopathologic evaluations of biopsy specimens were performed to analysis the association between the dupA cluster and the inflammatory response. IL-8 productions in gastric mucosa and from GES-1 cells co-cultured with H. pylori were measured, respectively, to analysis the association between the dupA cluster status and IL-8 production. We found that gastric mucosal inflammatory cell infiltration was significantly higher in patients with dupA-positive H. pylori, including H. pylori with complete dupA cluster (2.71 ± 0.79) and incomplete dupA cluster (2.09 ± 0.61) than in patients with dupA-negative strain (1.73 ± 0.60, p < 0.01), whereas no significant difference in the gastric mucosal atrophy was found according to the status of dupA cluster. Gastric mucosal IL-8 levels were higher in the complete dupA cluster group than in other groups (p < 0.01), and IL-8 production from GES-1 cells was also significantly higher in strains with a complete dupA cluster (1527.9 ± 180.0 pg/ml) than in those with an incomplete dupA cluster (1229.4 ± 75.3 pg/ml, p < 0.01) or those with dupA negative (1201.9 ± 92.3 pg/ml, p < 0.01). In conclusion, the complete dupA cluster in H. pylori is associated with inflammatory cell infiltration and IL-8 secretion, and H. pylori strain with a complete dupA cluster seems to be more virulent than other strains with the incomplete dupA cluster or dupA negative.
authors.affiliation: School of Medical Science and Laboratory Medicine, Jiangsu University, Zhenjiang, Jiangsu, 212013, People's Republic of China.
authors.forename: Ming-yi
authors.initials: MY
authors.lastname: Wang
authors.forename: Chen
authors.initials: C
authors.lastname: Shao
authors.forename: Jie
authors.initials: J
authors.lastname: Li
authors.forename: Ya-Chao
authors.initials: YC
authors.lastname: Yang
authors.forename: Shao-bo
authors.initials: SB
authors.lastname: Wang
authors.forename: Jun-ling
authors.initials: JL
authors.lastname: Hao
authors.forename: Chun-mei
authors.initials: CM
authors.lastname: Wu
authors.forename: Xiao-zhong
authors.initials: XZ
authors.lastname: Gao
authors.forename: Shi-he
authors.initials: SH
authors.lastname: Shao
mesh_terms: D000942:Antigens, Bacterial / Q000032:analysis / Q000235:genetics; D001426:Bacterial Proteins / Q000032:analysis / Q000235:genetics; D001706:Biopsy; D015153:Blotting, Western; D002460:Cell Line; D002681:China; D018920:Coculture Techniques; D016207:Cytokines / Q000378:metabolism; D004847:Epithelial Cells / Q000276:immunology / Q000382:microbiology; D005753:Gastric Mucosa / Q000473:pathology; D005756:Gastritis / Q000382:microbiology; D016481:Helicobacter Infections / Q000382:microbiology; D016480:Helicobacter pylori / Q000235:genetics / Q000302:isolation & purification / Q000472:pathogenicity*; D006651:Histocytochemistry; D006801:Humans; D005810:Multigene Family; D016133:Polymerase Chain Reaction; D014774:Virulence; D037521:Virulence Factors / Q000032:analysis / Q000172:deficiency / Q000235:genetics / Q000378:metabolism*
chemical_list: D000942:Antigens, Bacterial; D001426:Bacterial Proteins; D016207:Cytokines; C528428:DupA protein, Helicobacter pylori; C074689:VacA protein, Helicobacter pylori; D037521:Virulence Factors; C080866:cagA protein, Helicobacter pylori
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