Immune response and alveolar bone resorption in a mouse model of Treponema denticola infection.
Treponema denticola is considered to be an agent strongly associated with periodontal disease. The lack of an animal infection model has hampered the understanding of T. denticola pathogenesis and the host's immune response to infection. In this study, we have established an oral infection model in mice, demonstrating that infection by oral inoculation is feasible. The presence of T. denticola in the oral cavities of the animals was confirmed by PCR. Mice given T. denticola developed a specific immune response to the bacterium. The antibodies generated from the infection were mainly of the immunoglobulin G1 subclass, indicating a Th2-tilted response. The antibodies recognized 11 T. denticola proteins, of which a 62-kDa and a 53-kDa protein were deemed immunodominant. The two proteins were identified, respectively, as dentilisin and the major outer sheath protein by mass spectrometry. Splenocytes cultured from the infected mice no longer produced interleukin-10 and produced markedly reduced levels of gamma interferon relative to those produced by naïve splenocytes upon stimulation with T. denticola. Mandibles of infected mice showed significantly greater bone resorption (P < 0.01) than those of mock-infected controls.
Lee
Song F
SF
Department of Applied Oral Sciences, Faculty of Dentistry, Dalhousie University, Halifax, Nova Scotia, Canada B3H 3J5. Song.Lee@Dal.Ca
Andrian
Elisoa
E
Rowland
Elden
E
Marquez
Ignacio Christian
IC
D016301:Alveolar Bone Loss / Q000276:immunology* / Q000382:microbiology*; D000595:Amino Acid Sequence; D000818:Animals; D000907:Antibodies, Bacterial / Q000276:immunology; D001426:Bacterial Proteins / Q000737:chemistry / Q000276:immunology; D002918:Chymotrypsin / Q000737:chemistry / Q000276:immunology; D004195:Disease Models, Animal; D005260:Female; D051379:Mice; D008810:Mice, Inbred C57BL; D009059:Mouth Diseases / Q000276:immunology / Q000382:microbiology; D010447:Peptide Hydrolases; D018272:Porins / Q000737:chemistry / Q000276:immunology; D048373:Treponema denticola / Q000276:immunology*; D014211:Treponemal Infections / Q000276:immunology* / Q000382:microbiology*
D000907:Antibodies, Bacterial; D001426:Bacterial Proteins; D018272:Porins; C099361:major outer sheath protein, Treponema; D010447:Peptide Hydrolases; C102570:dentilisin; D002918:Chymotrypsin