title: Helicobacter bilis sp. nov., a novel Helicobacter species isolated from bile, livers, and intestines of aged, inbred mice.
abstract: A fusiform bacterium with 3 to 14 multiple bipolar sheathed flagella and periplasmic fibers wrapped around the cell was isolated from the liver, bile, and lower intestine of aged, inbred mice. The bacteria grew at 37 and 42 degrees C under microaerophilic conditions, rapidly hydrolyzed urea, were catalase and oxidase positive, reduced nitrate to nitrite, did not hydrolyze indoxyl acetate or hippurate, and were resistant to both cephalothin and nalidixic acid but sensitive to metronidazole. On the basis of 16S rRNA gene sequence analysis, the organism was classified as a novel helicobacter, Helicobacter bilis. This new helicobacter, like Helicobacter hepaticus, colonizes the bile, liver, and intestine of mice. Although the organism is associated with multifocal chronic hepatitis, further studies are required to ascertain whether H. bilis is responsible for causing chronic hepatitis and/or hepatocellular tumors in mice.
authors.affiliation: Division of Comparative Medicine, Massachusetts Institute of Technology Cambridge 02139.
authors.forename: J G
authors.initials: JG
authors.lastname: Fox
authors.forename: L L
authors.initials: LL
authors.lastname: Yan
authors.forename: F E
authors.initials: FE
authors.lastname: Dewhirst
authors.forename: B J
authors.initials: BJ
authors.lastname: Paster
authors.forename: B
authors.initials: B
authors.lastname: Shames
authors.forename: J C
authors.initials: JC
authors.lastname: Murphy
authors.forename: A
authors.initials: A
authors.lastname: Hayward
authors.forename: J C
authors.initials: JC
authors.lastname: Belcher
authors.forename: E N
authors.initials: EN
authors.lastname: Mendes
mesh_terms: D000375:Aging; D000818:Animals; D001483:Base Sequence; D001646:Bile / Q000382:microbiology; D017931:DNA Primers / Q000235:genetics; D004269:DNA, Bacterial / Q000235:genetics; D005260:Female; D016998:Helicobacter / Q000235:genetics / Q000302:isolation & purification* / Q000648:ultrastructure; D006520:Hepatitis, Animal / Q000382:microbiology; D007422:Intestines / Q000382:microbiology; D008099:Liver / Q000382:microbiology; D008297:Male; D051379:Mice / Q000382:microbiology*; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D008808:Mice, Inbred CBA; D008811:Mice, Inbred DBA; D008854:Microscopy, Electron; D008969:Molecular Sequence Data; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D012329:RNA, Bacterial / Q000235:genetics; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D013045:Species Specificity
chemical_list: D017931:DNA Primers; D004269:DNA, Bacterial; D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S