title: Gastric lesions and immune responses caused by long-term infection with Helicobacter heilmannii in C57BL/6 mice.
abstract: Helicobacter heilmannii is a gastric micro-organism that can induce gastritis and B-cell MALT (mucosa-associated lymphoid tissue) lymphoma in mice, in a host-dependent manner. The present study was designed to examine gastric lesions and immune responses caused by intragastric H. heilmannii infection of an inbred mouse strain, C57BL/6. Long-term infection led to the formation of gastric nodules and increased mucosal thickness of the stomach, due to gastric epithelial proliferation. Infection also induced the formation of lymphoid follicles in the corpus mucosa and submucosa. The follicular cells were mainly CD45R+ cells that did not produce immunoglobulin. However, scattered in the lamina propria and corpus submucosa, numerous IgA+ cells were found in infected mice, but not in control mice. RT-PCR results showed that H. heilmannii infection led to increased mRNA expression for IFN-gamma (a Th1 cytokine) and IL-10 (a Th2 cytokine) in the mouse stomach, suggesting that both Th1 and Th2 responses are associated with H. heilmannii infection. The mRNA of other cytokines and chemokines (IL-1beta, IL-12p40, TNF-alpha, MCP-1, KC and MIP-2) was also increased by infection.
authors.affiliation: Department of Laboratory Animal Medicine, College of Veterinary Medicine and School of Agricultural Biotechnology, Seoul National University, San 56-1, Sillim 9-dong, Gwanak-gu, Seoul 151-742, Republic of Korea.
authors.forename: Jong-Hwan
authors.initials: JH
authors.lastname: Park
authors.forename: S H
authors.initials: SH
authors.lastname: Seok
authors.forename: M W
authors.initials: MW
authors.lastname: Baek
authors.forename: H Y
authors.initials: HY
authors.lastname: Lee
authors.forename: D J
authors.initials: DJ
authors.lastname: Kim
authors.forename: Jae-Hak
authors.initials: JH
authors.lastname: Park
mesh_terms: D000818:Animals; D001402:B-Lymphocytes / Q000276:immunology; D016207:Cytokines / Q000096:biosynthesis; D005260:Female; D005756:Gastritis / Q000276:immunology* / Q000382:microbiology* / Q000473:pathology*; D016481:Helicobacter Infections / Q000276:immunology* / Q000473:pathology*; D018247:Helicobacter heilmannii; D006965:Hyperplasia / Q000382:microbiology / Q000473:pathology; D007070:Immunoglobulin A / Q000276:immunology; D007150:Immunohistochemistry; D051379:Mice; D008810:Mice, Inbred C57BL; D012333:RNA, Messenger / Q000032:analysis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D018417:Th1 Cells / Q000276:immunology; D018418:Th2 Cells / Q000276:immunology
chemical_list: D016207:Cytokines; D007070:Immunoglobulin A; D012333:RNA, Messenger