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Abstract Chronic periodontitis (CP) is characterized by gingival inflammation and bone destruction. It has been reported that interferon-gamma (IFN-γ) levels are high in CP patients; however, the IFN-γ receptor (IFN-γR) has not been studied in gingival tissue from these patients. Objective: To evaluate IFN-γ levels and IFN-γR expression in gingival tissue biopsies from chronic periodontitis patients compared with healthy subjects (HS). Material and Methods: Gingival tissues were obtained from all study subjects, CP (n = 18) and healthy subjects (HS) (n = 12). A tissue section of each study subject was embedded in paraffin blocks to determine the expression of IFN-γ R (IFN-γR1 and IFN-γR2) through immunohistochemistry. Another section of the tissue was homogenized and IFN-γ was measured by the ELISA technique. Results: No significant differences were found in the IFN-γR1 expression within the cell layers of the gingival tissue of the study groups. When analyzing the IFN-γR2 expression it was found that IFN-γR2 is strongly expressed in the endothelial cells of CP patients when compared to HS (p<0.05). IFN-γ concentrations in the gingival tissue were significantly higher in CP patients than in HS. No significant correlation between IFN-γ levels and the expression of IFN-γR1 and IFN-γR2 was found. However, a positive correlation between IFN-γ levels and clinical parameters [probing depth (PD) and clinical attachment level (CAL)] was found. Conclusion: The study of IFN-γR expression in gingival tissue samples from patients with CP showed an increase only in the IFN-γR2 chain in endothelial cells when compared to HS.

La prueba de micronúcleos (MN) en sangre periférica es rápida, sencilla, económica y sirve para detectar genotóxicos ambientales. Los MN son fragmentos de cromosomas o cromosomas completos que por alguna causa quedan fuera del núcleo en mitosis, pero que incrementan significativamente cuando los organismos que los presentan de manera espontánea se exponen a genotóxicos. Por lo tanto, el requisito para que una especie pueda ser utilizada para esta prueba es que presente eritrocitos micronucleados espontáneos (EMNe), con lo que estas especies pueden ser potenciales bioindicadores de genotóxicos micronucleogénicos, con sólo una gota de su sangre. En el presente articulo es mostramos 9 especies de felinos que como característica general presentan EMNe. Del total de especies de felinos, el gato ha sido previamente probado, con resultados positivos y ya que también el león, yaguaroundi, lince, jaguar, puma, tigre de bengala, ocelote y leopardo presentan EMNe, esta familia puede ser propuesta como un grupo potencialmente adecuado para estudios de toxicogenética. En otras palabras, cada una de estas especies puede llegar a ser un modelo potencial para determinar exposición a genotóxicos en nuestro entorno, de una manera sencilla y rápida.

Felines: an alternative in genetic toxicology studies? The micronuclei (MN) test carry out in peripheral blood is fast, simple, economic and it is used to detect genotoxic environmental agents. MN are fragments of chromosomes or complete chromosomes remaining in the cytoplasm after cell division, which increase when organisms are exposed to genotoxic agents. Therefore, species with the highest values of spontaneous micronucleated erythrocytes (MNE) are the most suitable to be potentials biomonitor of micronucleogenic agents, using a drop of blood. Nine species of Felines that present spontaneous MNE in peripheral blood are shown. From these species, the cat has been previously proven, with positive results and also lion (Panthera leo), yaguaroundi (Felis yagoaroundi), lynx (Lynx ruffus), jaguar (Panthera onca), puma (Puma concolor), tiger (Panthera tigris), ocelote (Felis padalis) and leopard (Panthera pardus) display spontaneous MNE, and with this characteristic this Family can be propose like a potential group to be used in toxicogenetic studies. Rev. Biol. Trop. 56 (2): 969-974. Epub 2008 June 30.

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