title: Frequent and preferential infection of Treponema denticola, Streptococcus mitis, and Streptococcus anginosus in esophageal cancers.
abstract: Multiple cancers frequently occur in the upper digestive tract. One possible explanation is that specific bacterial infection stimulates the normal epithelium to initiate inflammation and/or promotes carcinogenesis. This study was undertaken to determine which bacterial species is predominantly associated with esophageal cancer. We examined the bacterial diversity in this type of cancer and in the saliva from healthy people by using a culture-independent molecular method. Here we report the preferential and frequent infection of the oral periodontopathic spirochete Treponema denticola (T. denticola), Streptococcus mitis (S. mitis), and Streptococus anginosus (S. anginosus) in esophageal cancer from different regions of the world, and we also describe the induction of inflammatory cytokines by infection of S. anginosus and S. mitis. Our present data suggest that these three bacteria could have significant roles in the carcinogenic process of many cases of esophageal cancer by causing inflammation and by promoting the carcinogenic process, and that eradication of these three bacteria may decrease the risk of recurrence.
authors.affiliation: Genetics Division, National Cancer Center Research Institute and Department of Surgery, National Cancer Center Hospital, Chuo-ku, Tokyo 104-0045, Japan.
authors.forename: Michihiro
authors.initials: M
authors.lastname: Narikiyo
authors.forename: Chikako
authors.initials: C
authors.lastname: Tanabe
authors.forename: Yukishige
authors.initials: Y
authors.lastname: Yamada
authors.forename: Hiroyasu
authors.initials: H
authors.lastname: Igaki
authors.forename: Yuji
authors.initials: Y
authors.lastname: Tachimori
authors.forename: Hoichi
authors.initials: H
authors.lastname: Kato
authors.forename: Manabu
authors.initials: M
authors.lastname: Muto
authors.forename: Ruggero
authors.initials: R
authors.lastname: Montesano
authors.forename: Hiromi
authors.initials: H
authors.lastname: Sakamoto
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Nakajima
authors.forename: Hiroki
authors.initials: H
authors.lastname: Sasaki
mesh_terms: D015152:Blotting, Northern; D002277:Carcinoma / Q000209:etiology / Q000382:microbiology* / Q000503:physiopathology; D003430:Cross-Sectional Studies; D016207:Cytokines / Q000032:analysis; D004938:Esophageal Neoplasms / Q000209:etiology / Q000382:microbiology* / Q000503:physiopathology; D006801:Humans; D007249:Inflammation; D016133:Polymerase Chain Reaction; D012463:Saliva / Q000382:microbiology; D013290:Streptococcal Infections / Q000150:complications*; D034366:Streptococcus anginosus / Q000302:isolation & purification / Q000472:pathogenicity*; D034361:Streptococcus mitis / Q000302:isolation & purification / Q000472:pathogenicity*; D014208:Treponema / Q000302:isolation & purification / Q000472:pathogenicity*; D014211:Treponemal Infections / Q000150:complications*
chemical_list: D016207:Cytokines