Expressão do interferon-γ em biópsias gengivais de pacientes com periodontite crônica severa

• Autor(a) principal: Beiler, Tatiane Flôr Coelho de Souza Breves
• Data de Publicação: 2014
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/14164
• topic: Interferon-γ; Chronic periodontitis; Gingival biopsies; Gingival crevicular fluid; Immunohistochemistry; Interferon-γ; Periodontite crônica; Biópsias gengivais; Fluido gengival; Imuno-histoquímica; CNPQ::CIENCIAS DA SAUDE::ODONTOLOGIA

The aim of this study was to analyze the expression of interferon-gamma (INF-γ) in gingival biopsies from shallow and deep sites in patients with severe chronic periodontitis. The secondary objective was to correlate the expression of INF-γ in the gingival crevicular fluid (GCF) with sites where the gingival biopsies were collected. Biopsies from 22 patients with chronic generalized or localized severe periodontitis (mean age 45.5 ± SD 8.9 years), 22 deep and 18 shallow sites were collected. The control group consisted of 14 patients clinically healthy (mean age 39.35 ± SD 16.5 years). In total, 54 biopsies were collected from 36 patients. The GCF samples were collected from some of the same sites where biopsies were performed, totaling 12 deep sites, 8 shallow sites and 4 control sites. Clinical evaluation parameters including probing pocket depth (PPD), clinical attachment level (CAL), visible plaque index (VPI) and gingival bleeding index (GBI) were used. The tissue was removed with a 2 mm of diameter punch, in the surgery area (control group) or in the subgingival scaling with or without surgical access (test group) and stored in an Eppendorff with 1 ml of 10% formaldehyde for subsequent morphological and immunohistochemical analysis. The intensity of staining was evaluated semi - quantitatively in the epithelial cells, plasma cells, macrophages, fibroblasts and endothelial cells, considering strong staining (score 2), weak staining (score 1) or absence of staining (score 0). The Kruskal-Wallis test was used to compare the expression of INF-γ in epithelial and connective tissues between the three groups (shallow and deep sites of periodontitis and control sites). We observed a trend for a similar pattern of staining in the shallow and deep sites, with a predominance of weak staining in deep sites. In control sites the staining of the epithelium was predominant. However, we could not demonstrate statistically significant differences between the expression of INF-γ in epithelial and connective tissues in the groups that were analyzed. The Spearman correlation analysis showed a strong correlation between the immunohistochemical expression of INF-γ in the epithelium with macrophages, fibroblasts and endothelial cells (r ≥ 0.6 and p ≤ 0.01). There was no correlation with the expression of INF-γ in the epithelial and connective tissues with the clinical data and with the GCF. We conclude that there were no differences in the expression of INF-γ in gingival biopsies in shallow and deep sites of pacients with periodontitis compared to healthy subjects, which may be attributed to the biphasic character of INF-γ. The low detection of INF-γ in the GCF, within the limitations of the study, may suggest that the GCF may not be the election method for detection of INF-γ.