title: An optimal host response to a bacterium may require the interaction of leukocytes and resident host cells.
abstract: Bacterial infection results in inflammatory responses that may lead to soft-tissue damage and bone resorption. However, the mechanisms by which different bacteria contribute to lesions of endodontic origin are not fully understood. This study examined the response to Streptococcus mutans and Porphyromonas endodontalis in two cell types that are involved in periapical pathology, mononuclear and osteoblastic cells. This was accomplished by measuring the induction of chemokines (monocyte chemoattractant protein-1, macrophage inflammatory protein-2) and proinflammatory cytokines (interleukin-1beta, tumor necrosis factor-alpha, interleukin-6, interferon-gamma). The results demonstrated that S. mutans more efficiently stimulate inflammatory cytokine production by mononuclear cells, whereas P. endodontalis is relatively more potent in activating osteoblastic cells. Moreover, optimal activation of osteoblastic cells by S. mutans requires soluble mediators produced by mononuclear cells, whereas P. endodontalis does not. These results suggest that the association of different bacteria with specific pathologic processes may be partially explained by their capacities to activate specific host cells.
authors.affiliation: Department of Endodontics, Boston University School of Dental Medicine, MA, USA.
authors.forename: Yanling
authors.initials: Y
authors.lastname: Jiang
authors.forename: Herbert
authors.initials: H
authors.lastname: Schilder
mesh_terms: D016475:3T3 Cells; D000818:Animals; D018929:Cell Culture Techniques; D018932:Chemokine CCL2 / Q000032:analysis; D054426:Chemokine CXCL2; D002630:Chemotactic Factors / Q000032:analysis; D002634:Chemotaxis, Leukocyte / Q000276:immunology; D017077:Culture Media, Conditioned; D018836:Inflammation Mediators / Q000032:analysis; D007371:Interferon-gamma / Q000032:analysis; D007375:Interleukin-1 / Q000032:analysis; D015850:Interleukin-6 / Q000032:analysis; D007963:Leukocytes, Mononuclear / Q000276:immunology*; D051379:Mice; D008810:Mice, Inbred C57BL; D008815:Mice, Inbred Strains; D015846:Monokines / Q000032:analysis; D010006:Osteoblasts / Q000276:immunology*; D017861:Porphyromonas / Q000276:immunology*; D013295:Streptococcus mutans / Q000276:immunology*; D014409:Tumor Necrosis Factor-alpha / Q000032:analysis
chemical_list: D018932:Chemokine CCL2; D054426:Chemokine CXCL2; D002630:Chemotactic Factors; D017077:Culture Media, Conditioned; D018836:Inflammation Mediators; D007375:Interleukin-1; D015850:Interleukin-6; D015846:Monokines; D014409:Tumor Necrosis Factor-alpha; D007371:Interferon-gamma