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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.)

Macrophage Cell Activation with Acute Apical Abscess Contents Determined by Interleukin-1 Beta and Tumor Necrosis Factor Alpha Production

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Author(s):
Sousa, Ezilmara L. R. [1, 2] ; Martinho, Frederico C. [1, 3] ; Leite, Fabio R. M. [4] ; Nascimento, Gustavo G. [5] ; Gomes, Brenda P. F. A. [1]
Total Authors: 5
Affiliation:
[1] Univ Estadual Campinas, State Univ Campinas, Piracicaba Dent Sch, Dept Restorat Dent, Endodont Div, Piracicaba, SP - Brazil
[2] Univ Fed Pelotas, Pelotas Sch Dent, Dept Conservat Dent, Endodont Div, Pelotas, RS - Brazil
[3] UNESP, Sao Jose dos Campos Dent Sch, Dept Restorat Dent, Endodont Div, Sao Jose Dos Campos, SP - Brazil
[4] Univ Fed Pelotas, Dept Semiol & Clin, Periodont Div, Pelotas, RS - Brazil
[5] Univ Fed Pelotas, Pelotas Sch Dent, Pelotas, RS - Brazil
Total Affiliations: 5
Document type: Journal article
Source: JOURNAL OF ENDODONTICS; v. 40, n. 11, p. 1752-1757, NOV 2014.
Web of Science Citations: 6
Abstract

Introduction: This clinical study has investigated the antigenic activity of bacterial contents from exudates of acute apical abscesses (AAAs) and their paired root canal contents regarding the stimulation capacity by levels of interleukin (IL)-1 beta and tumor necrosis factor alpha (TNF-alpha) throughout the root canal treatment against macrophage cells. Methods: Paired samples of infected root canals and exudates of AAAs were collected from 10 subjects. Endodontic contents were sampled before (root canal sample {[}RCS] 1) and after chemomechanical preparation (RCS2) and after 30 days of intracanal medication with calcium hydroxide + chlorhexidine gel (Ca{[}OH](2) + CHX gel) (RCS3). Polymerase chain reaction (16S rDNA) was used for detection of the target bacteria, whereas limulus amebocyte lysate was used to measure endotoxin levels. Raw 264.7 macrophages were stimulated with AAA exudates from endodontic contents sampled in different moments of root canal treatment. Enzyme-linked immunosorbent assays were used to measure the levels of TNF-alpha and 11-1 beta. Results: Parvimonas micra, Porphyromonas endodontalis, Dialister pneumosintes, and Prevotella nigrescens were the most frequently detected species. Higher levels of endotoxins were found in samples from periapical exudates at RCS1 (P < .005). In fact, samples collected from periapical exudates showed a higher stimulation capacity at RCS1 (P < .05). A positive correlation was found between endotoxins from exudates with IL-1 beta (r = 0.97) and TNF-alpha (r = 0.88) production (P < .01). The significant reduction of endotoxins and bacterial species achieved by chemomechanical procedures (RCS2) resulted in a lower capacity of root canal contents to stimulate the cells compared with that at RCS1 (P < .05). The use of Ca(OH)(2) + CHX gel as an intracanal medication (RCS3) improved the removal of endotoxins and bacteria from infected root canals (P < .05) whose contents induced a lower stimulation capacity against macrophages cells at RCS1, RCS2, and RCS3 (P < .05). Conclusions: AAA exudates showed higher levels of endotoxins and showed a greater capacity of macrophage stimulation than the paired root canal samples. Moreover, the use of intracanal medication improved the removal of bacteria and endotoxins from infected root canals, which may have resulted in the reduction of the inflammatory potential of the root canal content. (AU)

FAPESP's process: 10/19136-1 - Microbiological and endotoxins analysis in primarily infected root canals with apical periodontitis and their antigenic potencial against macrophages to produce IL1-beta e TNF-alfa during endodontic treatment
Grantee:Brenda Paula Figueiredo de Almeida Gomes
Support Opportunities: Regular Research Grants
FAPESP's process: 10/17877-4 - Microbiological analysis and quantification of endotoxins and proinflammatory cytokines from primarily infected root canals with apical periodontitis
Grantee:Brenda Paula Figueiredo de Almeida Gomes
Support Opportunities: Regular Research Grants
FAPESP's process: 11/09047-4 - Investigation of microbial diversity from primary endodontic infection by clonal analysis and 16S rRNA sequencing
Grantee:Brenda Paula Figueiredo de Almeida Gomes
Support Opportunities: Regular Research Grants