title: Severity of gastritis determines glandular stomach carcinogenesis in Helicobacter pylori-infected Mongolian gerbils.
abstract: Helicobacter pylori (H. pylori) infection causes chronic gastritis and is also related to gastric carcinoma. The present study focused on severity of H. pylori-induced gastritis as a determinant of carcinogenesis. Seven-week-old male Mongolian gerbils were inoculated with H. pylori at experimental weeks 0, 12, or 18, then given N-methyl-N-nitorosourea (MNU) from weeks 20-40. At week 70, stomachs were then excised for histological examination 70, 58, or 52 weeks after H. pylori inoculation, respectively (Groups A, B, and C for long-, middle-, and short-term). The respective incidences of glandular stomach adenocarcinomas were 65.0% (13/20), 20.0% (2/10), and 23.0% (3/13) (P<0.05). Higher scores of infiltration of inflammatory cells, hyperplasia, intestinal metaplasia and mucosal bromodeoxyuridine (BrdU) labeling index in antrum and corpus mucosa, were seen in group A than B or C (P<0.05) and serum anti-H. pylori IgG titer and gastrin levels were also significantly higher, along with mRNA levels for mucosal interleukin-1beta (IL-1beta), tumor necrosis factor-alpha (TNF-alpha), cyclooxygenase-2 (COX-2), and inducible nitric oxide synthase (iNOS). The results demonstrated the term and severity of H. pylori infection to play important roles in gastric carcinogenesis, with essential involvement of chronic inflammation, especially increased rates of cell proliferation, in H. pylori-associated carcinogenesis.
authors.affiliation: Division of Oncological Pathology, Aichi Cancer Center Research Institute, 1-1 Kanokoden, Chikusa-ku, Nagoya, Aichi 464-8681, Japan.
authors.forename: Xueyuan
authors.initials: X
authors.lastname: Cao
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Tsukamoto
authors.forename: Koji
authors.initials: K
authors.lastname: Nozaki
authors.forename: Harunari
authors.initials: H
authors.lastname: Tanaka
authors.forename: Liyu
authors.initials: L
authors.lastname: Cao
authors.forename: Takeshi
authors.initials: T
authors.lastname: Toyoda
authors.forename: Shinji
authors.initials: S
authors.lastname: Takasu
authors.forename: Hisayo
authors.initials: H
authors.lastname: Ban
authors.forename: Toshiko
authors.initials: T
authors.lastname: Kumagai
authors.forename: Masae
authors.initials: M
authors.lastname: Tatematsu
mesh_terms: D000230:Adenocarcinoma / Q000378:metabolism / Q000382:microbiology*; D000818:Animals; D005753:Gastric Mucosa / Q000378:metabolism / Q000382:microbiology*; D005756:Gastritis / Q000150:complications* / Q000382:microbiology; D005849:Gerbillinae; D016481:Helicobacter Infections / Q000150:complications*; D016480:Helicobacter pylori; D053583:Interleukin-1beta / Q000378:metabolism; D008297:Male; D013274:Stomach Neoplasms / Q000382:microbiology*; D014409:Tumor Necrosis Factor-alpha / Q000378:metabolism
chemical_list: D053583:Interleukin-1beta; D014409:Tumor Necrosis Factor-alpha