title: Gamma interferon positively modulates Actinobacillus actinomycetemcomitans-specific RANKL+ CD4+ Th-cell-mediated alveolar bone destruction in vivo.
abstract: Recent studies have shown the biological and clinical significance of signaling pathways of osteogenic cytokines RANKL-RANK/OPG in controlling osteoclastogenesis associated with bone pathologies, including rheumatoid arthritis, osteoporosis, and other osteolytic disorders. In contrast to the inhibitory effect of gamma interferon (IFN-gamma) on RANKL-mediated osteoclastogenesis reported recently, alternative new evidence is demonstrated via studies of experimental periodontitis using humanized NOD/SCID and diabetic NOD mice and clinical human T-cell isolates from diseased periodontal tissues, where the presence of increasing IFN-gamma is clearly associated with (i) enhanced Actinobacillus actinomycetemcomitans-specific RANKL-expressing CD4(+) Th cell-mediated alveolar bone loss during the progression of periodontal disease and (ii) a concomitant and significantly increased coexpression of IFN-gamma in RANKL(+) CD4(+) Th cells. Therefore, there are more complex networks in regulating RANKL-RANK/OPG signaling pathways for osteoclastogenesis in vivo than have been suggested to date.
authors.affiliation: Lab. of Molecular Microbial Immunity, Eastman Dental Center, University of Rochester Medical Centre, Box 683, 625 Elmwood Ave., Rochester, NY 14620, USA. andy_teng@urmc.rochester.edu
authors.forename: Yen-Tung A
authors.initials: YT
authors.lastname: Teng
authors.forename: Deeqa
authors.initials: D
authors.lastname: Mahamed
authors.forename: Bhagirath
authors.initials: B
authors.lastname: Singh
mesh_terms: D000328:Adult; D016976:Aggregatibacter actinomycetemcomitans / Q000472:pathogenicity*; D016301:Alveolar Bone Loss / Q000209:etiology*; D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D002352:Carrier Proteins / Q000032:analysis / Q000502:physiology*; D005260:Female; D006801:Humans; D007371:Interferon-gamma / Q000502:physiology*; D008297:Male; D008562:Membrane Glycoproteins / Q000032:analysis / Q000502:physiology*; D051379:Mice; D008807:Mice, Inbred BALB C; D053245:RANK Ligand; D053246:Receptor Activator of Nuclear Factor-kappa B; D015398:Signal Transduction
chemical_list: D002352:Carrier Proteins; D008562:Membrane Glycoproteins; D053245:RANK Ligand; D053246:Receptor Activator of Nuclear Factor-kappa B; C505686:TNFRSF11A protein, human; C505688:TNFSF11 protein, human; C505687:Tnfrsf11a protein, mouse; C505689:Tnfsf11 protein, mouse; D007371:Interferon-gamma