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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Signaling transduction analysis in gingival epithelial cells after infection with Aggregatibacter actinomycetemcomitans

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Author(s):
Umeda, J. E. [1] ; Demuth, D. R. [2] ; Ando, E. S. [1] ; Faveri, M. [3] ; Mayer, M. P. A. [1]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Inst Biomed Sci, Dept Microbiol, BR-05508900 Sao Paulo - Brazil
[2] Univ Louisville, Sch Dent, Louisville, KY 40292 - USA
[3] Univ Guarulhos, Dent Res Div, Dept Periodontol, Guarulhos - Brazil
Total Affiliations: 3
Document type: Journal article
Source: Molecular Oral Microbiology; v. 27, n. 1, p. 23-33, FEB 2012.
Web of Science Citations: 13
Abstract

Periodontal diseases result from the interaction of bacterial pathogens with the hosts gingival tissue. Gingival epithelial cells are constantly challenged by microbial cells and respond by altering their transcription profiles, inducing the production of inflammatory mediators. Different transcription profiles are induced by oral bacteria and little is known about how the gingival epithelium responds after interaction with the periodontopathogenic organism Aggregatibacter actinomycetemcomitans. In the present study, we examined the transcription of genes involved in signaling transduction pathways in gingival epithelial cells exposed to viable A.actinomycetemcomitans. Immortalized gingival epithelial cells (OBA-9) were infected with A.actinomycetemcomitans JP2 for 24 h and the transcription profile of genes encoding human signal transduction pathways was determined. Functional analysis of inflammatory mediators positively transcribed was performed by ELISA in culture supernatant and in gingival tissues. Fifteen of 84 genes on the array were over-expressed (P < 0.01) after 24 h of infection with viable A.actinomycetemcomitans. Over-expressed genes included those implicated in tissue remodeling and bone resorption, such as CSF2, genes encoding components of the LDL pathway, nuclear factor-?B-dependent genes and other cytokines. The ELISA data confirmed that granulocytemacrophage colony-stimulating factor/colony-stimulating factor 2, tumor necrosis factor-a and intercellular adhesion molecule-1 were highly expressed by infected gingival cells when compared with control non-infected cells, and presented higher concentrations in tissues from patients with aggressive and chronic periodontitis than in tissues from healthy controls. The induction in epithelial cells of factors such as the pro-inflammatory cytokine CSF2, which is involved in osteoclastogenesis, may help to explain the outcomes of A.actinomycetemcomitans infection. (AU)

FAPESP's process: 03/08598-0 - Virulence factors of A. actinomycetemcomitans: role in disease, expression regulation, diversity and immune response
Grantee:Marcia Pinto Alves Mayer
Support Opportunities: Research Projects - Thematic Grants