Expressão de marcadores de células-tronco mesenquimais em abscesso e granuloma periapical
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2019-05-07
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Universidade Federal de Goiás
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Introduction: The relationship between inflammation, the formation of periapical lesions and mesenchymal stem cells need further elucidation. Evidence for the characterization of mesenchymal stem cells in periapical abscesses and granulomas becomes opportune for a better understanding of the periapical lesion microenvironment formation. Objective: To evaluate the immunohistochemical expression of CD44, CD73, CD105 and CD45 markers of mesenchymal stem cells in periapical lesions of teeth with histopathological diagnosis of abscess and periapical granuloma by means of immunohistochemistry. Methodology: Samples of periapical lesions diagnosed as abscess (n = 10) and periapical granuloma (n = 10) were selected from teeth of patients attended at the Emergency Department of the Faculty of Dentistry of the Federal University of Goiás (FO / UFG) kept in blocks of paraffin on the bench of the Endodontic Science laboratory. The diagnostic confirmation of the samples was made from the analysis of the slides with hematoxylin and eosin staining. The immunohistochemical expression of the CD44, CD73 and CD105 positive markers and the CD45 negative marker was analyzed, and the presence or absence of positive cells was evidenced in the area examined. It was considered as immunohistochemical expression of mesenchymal stem cells when there was the expression of the three positive markers and no expression of the negative marker. The frequencies of the qualitative variables were obtained. Qualitative variables were assessed using the Chi-square test. Values of p <0.05 were considered significant. Results: Expression of mesenchymal stem cells was confirmed by positive expression of CD44, CD73 and CD105 markers and absence of CD45 marker expression. This occurred 40% (4/10) in cases of abscesses and in the group of granulomas in 20% (2/10) of the cases. Conclusions: Abscess and periapical granuloma presented immunohistochemical expression of mesenchymal stem cells. The cases of periapical abscesses presented a higher percentage of immunohistochemical expression for mesenchymal stem cells than those of periapical granumola.
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BARBOSA, M. G. Expressão de marcadores de células-tronco mesenquimais em abscesso e granuloma periapical. 2019. 45 f. Dissertação (Mestrado em Odontologia) - Universidade Federal de Goiás, Goiânia, 2019.