title: Esophageal intraepithelial invasion of Helicobacter pylori correlates with atypical hyperplasia.
abstract: Helicobacter pylori (H. pylori), a common pathogen residing in the gastrointestinal tract, has been well characterized in stomach cancer,while its correlation with esophageal cancer remains poorly understood. In this study, we aim to assess the relationship between esophageal intraepithelial H. pylori invasion and inflammation as well as atypical hyperplasia in esophageal squamous epithelial tissues. Esophageal squamous cell carcinoma (ESCC) tissue samples from 196 individuals from both southern and northern esophageal carcinoma high-risk areas in China were examined (125 from northern high-risk areas, 71 from southern high-risk area), while additional 30 samples were collected adjacent to the esophageal squamous cell carcinoma (A-ESCC). H. pylori infection was identified by Giemsa staining, immuno-histochemical staining, and H. pylori 16S rRNA-based PCR. A significant increase of H. pylori infection was found in tumor tissues (including ESCC and A-ESCC samples) compared to that of non-tumor tissues (p < 0.05). The positive rate of H. pylori 16S rRNA in ESCC, A-ESCC, and normal groups were 62.5, 74.1, and 26.7%, respectively. The PCR results showed that the positive incidence of the H. pylori virulence factor CagA gene in tumor (ESCC and A-ESCC) and normal groups was 54.9 and 20%, respectively (p < 0.05). To explore the possible causes of CagA+ H. pylori infection leading to carcinogenesis, we found that CagA+ H. pylori filtrate induced DNA strand breaks in esophageal epithelial NE3 cells, suggesting that H. pylori infection may be an original cause leading to atypical hyperplasia of esophageal squamous epithelial tissues and contributed to pathological carcinogenesis of ESCC.
authors.affiliation: Key Immunopathology Laboratory of Guangdong Province, Institute of Clinical Pathology & Department of Pathology, Shantou University Medical College, Shantou, Guangdong, China; Shaanxi Provincial People's Hospital, The Third Affiliated Hospital, Medical College of Xi'an Jiaotong University, Xi'an, China.
authors.forename: Wen-sheng
authors.initials: WS
authors.lastname: Li
authors.forename: Dong-ping
authors.initials: DP
authors.lastname: Tian
authors.forename: Xiao-ying
authors.initials: XY
authors.lastname: Guan
authors.forename: Hailong
authors.initials: H
authors.lastname: Yun
authors.forename: Hong-tao
authors.initials: HT
authors.lastname: Wang
authors.forename: Yinping
authors.initials: Y
authors.lastname: Xiao
authors.forename: Chao
authors.initials: C
authors.lastname: Bi
authors.forename: Songmin
authors.initials: S
authors.lastname: Ying
authors.forename: Min
authors.initials: M
authors.lastname: Su
mesh_terms: D000942:Antigens, Bacterial / Q000378:metabolism; D001426:Bacterial Proteins / Q000378:metabolism; D002278:Carcinoma in Situ / Q000382:microbiology* / Q000473:pathology; D002294:Carcinoma, Squamous Cell / Q000382:microbiology* / Q000473:pathology; D016022:Case-Control Studies; D002478:Cells, Cultured; D004279:DNA, Viral / Q000235:genetics; D004938:Esophageal Neoplasms / Q000382:microbiology* / Q000473:pathology; D005500:Follow-Up Studies; D042822:Genomic Instability; D016481:Helicobacter Infections / Q000382:microbiology* / Q000473:pathology; D016480:Helicobacter pylori / Q000235:genetics / Q000302:isolation & purification / Q000472:pathogenicity*; D006801:Humans; D006965:Hyperplasia; D007124:Immunoenzyme Techniques; D007249:Inflammation / Q000209:etiology / Q000473:pathology; D009361:Neoplasm Invasiveness; D016133:Polymerase Chain Reaction; D011379:Prognosis; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012307:Risk Factors
chemical_list: D000942:Antigens, Bacterial; D001426:Bacterial Proteins; D004279:DNA, Viral; D012336:RNA, Ribosomal, 16S; C080866:cagA protein, Helicobacter pylori
keywords: CagA; DNA damage response; Helicobacter pylori; esophageal squamous cell carcinoma; genomic instability