Local and systemic inflammatory profile of Wistar rats with multiple endodontics infections

Author(s)

Renata Oliveira Samuel

• Document type: Doctoral Thesis
• Press: Araçatuba. 2016-05-12.
• Institution: Universidade Estadual Paulista (Unesp). Faculdade de Odontologia. Araçatuba
• Defense date: 2016-03-11
• Advisor: Luciano Tavares Angelo Cintra

Abstract

The aim of this work will contribute to understanding of the mechanisms that involve the relationship between infections of endodontic origin and state of bodily homeostasis. Thus, we propose to investigate the profile of local inflammatory induced apical periodontitis and correlate with changes in the profile systemic model with a onlyl or multiple endodontic infections. It were used 30 Wistar rats divided into three groups of 10 animals each: healthy rats; 1AP - rats with only endodontic infection; 4AP rats with multiple endodontic infections. After 30 days, blood was collected by cardiac puncture for complete blood count (RBCs, packed cell volume, hemoglobin, mean corpuscular volume, mean corpuscular hemoglobin concentration, leukocytes, neutrophil, lymphocyte, monocyte, eosinophil, basophil and platelets), serum quantification of proinflammatory cytokines (IL-17, IL-23, IL-6, TNF-α, IFN-γ) by ELISA and nitric oxide. After blood collection, the animals were killed, the jaws were processed for light microscopy in HE staining and immunohistochemical staining of inflammatory mediators above. The results of the different analyzes and the correlation between the local and systemic findings were analyzed by statistical tests specific to each case (p<0,05). Histological analysis confirmed the presence of apical periodontitis in 1AP and 4AP, with moderate inflammatory infiltrate. Furthermore, it was observed increase of all above mediators in lesions when compared to healthy tissue (p <0.05). In serum analysis, 4AP showed lymphocytes, leukocytes, TNF-α, IL-6, IL-17 and IL-23 increase when compared to healthy rats (p <0.05). Furthermore, there was a decrease of NO in 4AP and 1AP when compared to healthy rats (p <0.05). IFN-γ level was not different between the groups (p>0.05). It is concluded that the presence of apical periodontitis in multiple teeth can lead to significant alterations from increased serum lymphocytes, leukocytes and pro-inflammatory cytokines TNF-α, IL-6, IL- 17 and IL-23. Furthermore, apical periodontitis in only or multiple teeth leads to decrease of serum levels of NO. (AU)

• FAPESP's process: 13/23358-8 - Local and systemic inflammatory profile of rats wistar with multiple endodontics infections
• Grantee: Renata Oliveira Samuel
• Support Opportunities: Scholarships in Brazil - Doctorate