title: Molecular characterization of Treponema denticola infection-induced bone and soft tissue transcriptional profiles.
abstract: Treponema denticola is associated with subgingival biofilms in adult periodontitis and with acute necrotizing ulcerative gingivitis. However, the molecular mechanisms by which T. denticola impacts periodontal inflammation and alveolar bone resorption remain unclear. Here, we examined changes in the host transcriptional profiles during a T. denticola infection using a murine calvarial model of inflammation and bone resorption. T. denticola was injected into the subcutaneous soft tissue over the calvaria of BALB/c mice for 3 days, after which the soft tissues and the calvarial bones were excised. RNA was isolated and analysed for transcript profiling using Murine GeneChip arrays. Following T. denticola infection, 2905 and 1234 genes in the infected calvarial bones and soft tissues, respectively, were differentially expressed (P <or= 0.05). Biological pathways significantly impacted by T. denticola infection in calvarial bone and calvarial tissue included leukocyte transendothelial migration, cell adhesion (immune system) molecules, cell cycle, extracellular matrix-receptor interaction, focal adhesion, B-cell receptor signaling and transforming growth factor-beta signaling pathways resulting in proinflammatory, chemotactic effects, and T-cell stimulation. In conclusion, localized T. denticola infection differentially induces transcription of a broad array of host genes, the profiles of which differed between inflamed calvarial bone and soft tissues.
authors.affiliation: Center for Oral Health Research, College of Dentistry, University of Kentucky, Lexington, KY, USA.
authors.forename: V
authors.initials: V
authors.lastname: Bakthavatchalu
authors.forename: A
authors.initials: A
authors.lastname: Meka
authors.forename: S
authors.initials: S
authors.lastname: Sathishkumar
authors.forename: M C
authors.initials: MC
authors.lastname: Lopez
authors.forename: R K
authors.initials: RK
authors.lastname: Verma
authors.forename: S M
authors.initials: SM
authors.lastname: Wallet
authors.forename: I
authors.initials: I
authors.lastname: Bhattacharyya
authors.forename: B F
authors.initials: BF
authors.lastname: Boyce
authors.forename: J J
authors.initials: JJ
authors.lastname: Mans
authors.forename: R J
authors.initials: RJ
authors.lastname: Lamont
authors.forename: H V
authors.initials: HV
authors.lastname: Baker
authors.forename: J L
authors.initials: JL
authors.lastname: Ebersole
authors.forename: L
authors.initials: L
authors.lastname: Kesavalu
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial / Q000097:blood; D001862:Bone Resorption / Q000235:genetics* / Q000276:immunology / Q000382:microbiology*; D016207:Cytokines / Q000096:biosynthesis* / Q000235:genetics; D004847:Epithelial Cells / Q000382:microbiology; D005260:Female; D020869:Gene Expression Profiling; D054884:Host-Pathogen Interactions; D018836:Inflammation Mediators / Q000378:metabolism*; D051379:Mice; D008807:Mice, Inbred BALB C; D020411:Oligonucleotide Array Sequence Analysis; D010011:Osteocytes / Q000382:microbiology; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012886:Skull; D015533:Transcriptional Activation; D048373:Treponema denticola / Q000502:physiology*; D014211:Treponemal Infections / Q000235:genetics* / Q000276:immunology
chemical_list: D000907:Antibodies, Bacterial; D016207:Cytokines; D018836:Inflammation Mediators