Your browser doesn't support javascript.
loading
Show: 20 | 50 | 100
Results 1 - 3 de 3
Filter
Add filters








Year range
1.
Article in Portuguese | LILACS, BBO | ID: lil-614366

ABSTRACT

Objetivo: Induzir a carcinogênese na mucosa lingual de ratos Wistar através do óxido de nitroquinolina (4NQO), relacionando as alterações clínicas e microscópicas desenvolvidas com o tempo de exposição ao carcinógeno. Método: Foram utilizados 20 ratos que foram distribuídos entre o grupo experimental (15 animais) e controle (5 animais). No grupo experimental os animais foram alocados em 3 subgrupos, nos quais 5 animais receberam o 4NQO por 2 meses (A1), 5 por 3 meses (A2) e o restante por 4 meses (A3), o que tornou possível a detecção das diferentes fases da carcinogênese. Os dados foram apresentados por meio da estatística descritiva e foram utilizados os testes de Kruskal-Wallis e de Mann-Whitney. O programa estatístico utilizado foi o SPSS (Statistical Package for the Social Sciences) na versão 13 e a margem de erro utilizada foi de 5,0%. Resultados: Tanto o modelo animal escolhido, como o carcinógeno químico utilizado foram satisfatórios para produção da carcinogênese oral similar a que ocorre em humanos. As alterações clínicas foram mais acentuadas nos animais que receberam as aplicações tópicas do 4NQO durante 4 meses, sendo possível visualizar desde uma leucoplasia a regiões eritroleucoplásicas. As alterações histopatológicas observadas no epitélio oral foram compatíveis com o diagnóstico de displasia epitelial leve, moderada, severa, carcinoma in situ ou carcinoma invasivo. Conclusão: A severidade das lesões teve relação direta com o tempo de exposição ao 4NQO.


Objective: To induce carcinogenesis on the lingual mucosa of Wistar rats by the administration of nitroquinoline oxide (4NQO), relating the clinical and microscopic alterations developed during the time of exposure to the carcinogenic agent. Methods: Twenty rats were allocated to either an experimental (15 animals) or a control (5 animals) group. In the experimental group, the animals were divided into 3 subgroups in which 5 animals received 4NQO during 2 months (A1), 5 during 3 months (A2), and 5 during 4 months (A3), making it possible to detect the different phases of carcinogenesis. Data were presented as descriptive statistics using the Kruskal-Wallis and Mann-Whitney tests in the SPSS (Statistical Package for the Social Sciences) software, version 13.0. The significance level was set at 5.0%. Results: Both the animal model and the carcinogenic agent used in the study were satisfactory for inducing similar oral carcinogenesis to the one occurring in humans. The clinical alterations were more accentuated in the animals that received the topical applications of 4NQO during 4 months, ranging from leukoplakia to erythroleukoplakias regions. The histopathological alterations observed in the oral epithelium were compatible with the diagnosis of mild, moderate and severe epithelial dysplasia, in situ carcinoma or invasive carcinoma. Conclusion: The severity of the lesions had a direct relationship with the exposure time to 4NQO.


Subject(s)
Animals , Rats , Carcinoma, Squamous Cell , Carcinoma in Situ , Biomarkers, Tumor/administration & dosage , Mouth Mucosa , Rats, Wistar , Statistics, Nonparametric
2.
Pesqui. bras. odontopediatria clín. integr ; 11(1): 13-20, jul. 2011. ilus, tab, graf
Article in Portuguese | LILACS, BBO | ID: biblio-874392

ABSTRACT

Objetivo: Induzir a carcinogênese na mucosa lingual de ratos Wistar através do óxido de nitroquinolina (4NQO), relacionando as alterações clínicas e microscópicas desenvolvidas com o tempo de exposição ao carcinógeno. Método: Foram utilizados 20 ratos que foram distribuídos entre o grupo experimental (15 animais) e controle (5 animais). No grupo experimental os animais foram alocados em 3 subgrupos, nos quais 5 animais receberam o 4NQO por 2 meses (A1), 5 por 3 meses (A2) e o restante por 4 meses (A3), o que tornou possível a detecção das diferentes fases da carcinogênese. Os dados foram apresentados por meio da estatística descritiva e foram utilizados os testes de Kruskal-Wallis e de Mann-Whitney. O programa estatístico utilizado foi o SPSS (Statistical Package for the Social Sciences) na versão 13 e a margem de erro utilizada foi de 5,0%. Resultados: Tanto o modelo animal escolhido, como o carcinógeno químico utilizado foram satisfatórios para produção da carcinogênese oral similar a que ocorre em humanos. As alterações clínicas foram mais acentuadas nos animais que receberam as aplicações tópicas do 4NQO durante 4 meses, sendo possível visualizar desde uma leucoplasia a regiões eritroleucoplásicas. As alterações histopatológicas observadas no epitélio oral foram compatíveis com o diagnóstico de displasia epitelial leve, moderada, severa, carcinoma in situ ou carcinoma invasivo. Conclusão: A severidade das lesões teve relação direta com o tempo de exposição ao 4NQO.


Objective: To induce carcinogenesis on the lingual mucosa of Wistar rats by the administration of nitroquinoline oxide (4NQO), relating the clinical and microscopic alterations developed during the time of exposure to the carcinogenic agent. Methods: Twenty rats were allocated to either an experimental (15 animals) or a control (5 animals) group. In the experimental group, the animals were divided into 3 subgroups in which 5 animals received 4NQO during 2 months (A1), 5 during 3 months (A2), and 5 during 4 months (A3), making it possible to detect the different phases of carcinogenesis. Data were presented as descriptive statistics using the Kruskal-Wallis and Mann-Whitney tests in the SPSS (Statistical Package for the Social Sciences) software, version 13.0. The significance level was set at 5.0%. Results: Both the animal model and the carcinogenic agent used in the study were satisfactory for inducing similar oral carcinogenesis to the one occurring in humans. The clinical alterations were more accentuated in the animals that received the topical applications of 4NQO during 4 months, ranging from leukoplakia to erythroleukoplakias regions. The histopathological alterations observed in the oral epithelium were compatible with the diagnosis of mild, moderate and severe epithelial dysplasia, in situ carcinoma or invasive carcinoma. Conclusion: The severity of the lesions had a direct relationship with the exposure time to 4NQO.


Subject(s)
Animals , Rats , Carcinoma, Squamous Cell , Carcinoma in Situ , Biomarkers, Tumor/administration & dosage , Mouth Mucosa , Rats, Wistar , Statistics, Nonparametric
3.
Int. j. morphol ; 27(3): 899-903, sept. 2009. ilus
Article in English | LILACS | ID: lil-598954

ABSTRACT

The TMJ has been to the Dental community a key point in the search of knowledge, being it part of the temporomandibular joint complex and of the estomatognathic system which are in charge of the mastication, speech, swallowing, as well as participation in breathing and taste perception. For the majority of the women in serious state of depression, which do not respond psychotherapeutic treatment, pharmacological treatment it's applied. The antidepressants serotonin selective reuptake inhibitors (SSRIs) are the most recommended in these cases. The teratogenic effect of the SSRIs is considered controversial, studies done with women who used these drugs during the pregnancy showed that the respiratory and central nervous systems are the most affected, was also recorded a deficit of body growth and the decrease of the encephalon and skull measures. In the present study, our goal was to assess whether the administration of Fluoxetine during the pregnancy modified the embryology and morphology of the TMJ of rats. For that, 16 Wistar female rats from the Nutrition Department of the UFPE vivarium were selected; 8 for the control group, which received daily 0.9 percent of saline in subcutaneous dose of 10ml/g, with schedules previously established after daily weighing and 8 for the experimental one that were treated with fluoxetine hydrochloride with the dose of 10mg/Kg in a volume 10ml/g of weight, were injected subcutaneously with the same standards established for the control group. It was observed, with this dose that the embryological development of the TMJ, especially of the mandibular condyle, does not present any difference between the degree of maturation of the tissue that forms the TMJ, especially of the condyle between the treated and control groups.


La ATM ha sido para la comunidad odontológica un punto clave en la búsqueda del conocimiento, dado que forma parte del complejo articular temporomandibular y del sistema estomatognático, los cuales se encargan de la masticación, fonación y deglución, así como la participación en la respiración y de la percepción gustativa. Para la mayoría de las mujeres con cuadros graves de depresión, que no responden al tratamiento psicoterapéutico, el tratamiento farmacológico es aplicado. Los antidepresivos del grupo de los Inhibidores Selectivos de Recaptación de Serotonina (ISRSs) son los más comúnmente recomendados en estos casos. El efecto teratogénico de los ISRSs es considerado controversial. Estudios realizados en mujeres que utilizaron estas drogas durante la gestación mostraron que los sistemas respiratorios y nervioso central son los más afectados, también fue constatado un déficit de crecimiento corporal, encefálico y disminución de las medidas craneales. En el presente estudio, nuestro objetivo fue evaluar si la administración de fluoxetina durante la gestación modifica la embriología y la morfología de la ATM de ratas de laboratorio. Para este fin, 16 ratas Wistar del bioterio de nutrición de la UFPE fueron seleccionadas: 8 para el grupo de control, las cuales recibieron diariamente solución fisiológica a 0,9 por ciento en aplicaciones subcutáneas en la dosis de 10ml/g, en horarios previamente establecidos después de pesaje diario y 8 para el experimental, las que fueron tratadas con clorhidrato de fluoxetina en la dosis de 10mg/kg, en un volumen de 10ml/g, inyectados por vía subcutánea en los mismos estándares establecidos para el grupo de control. Se observó, que con esta dosis el desarrollo embriológico de la ATM, especialmente del cóndilo mandibular, no presentó ninguna diferencia entre el grado de maduración de los tejidos que forman la ATM, especialmente del cóndilo, entre los grupos tratado y grupo control.


Subject(s)
Animals , Male , Female , Pregnancy , Infant, Newborn , Infant , Temporomandibular Joint , Temporomandibular Joint/metabolism , Embryonic Development , Selective Serotonin Reuptake Inhibitors/metabolism , Selective Serotonin Reuptake Inhibitors/therapeutic use , Depression/metabolism , Depression/drug therapy , Fluoxetine/adverse effects , Fluoxetine/pharmacology , Fluoxetine/therapeutic use , Rats, Wistar/embryology
SELECTION OF CITATIONS
SEARCH DETAIL