ABSTRACT
Objetivo: A relação da osteoporose com pós-menopausa é controversa, mas pode ser um fator de risco para doença periodontal. Assim o objetivo deste projeto foi avaliar a influência da deficiência de estrógeno nos tecidos periodontais de ratas ovariectomizadas com peridontite induzida. Material e método: Quarenta ratas com 8 semanas de vida foram divididas aleatoriamente em 4 grupos: 1) Grupo controle; 2) Grupo ligadura; 3) Grupo ovariectomia; 4) Grupo ovariectomia e ligadura; sendo que todos os animais receberam dieta padrão e água à vontade. Aos 70 dias de vida os animais foram anestesiados e foi realizada a indução da doença periodontal, sendo após este procedimento aos 79 dias de vida, as ratas também foram submetidas à anestesia e à cirurgia de ovariectomia. Aos 100 dias de vida, as ratas foram sacrificadas sendo retiradas as hemimandíbulas esquerda e direita de cada rata para análises histomorfométrica e radiográfica, bem como amostras do tecido gengival para avaliar os tecidos periodontais. Resultados: Os resultados demonstraram que na análise radiográfica e histomorfométrica do osso alveolar dos primeiros molares inferiores nos grupos onde foi feita a indução da doença periodontal por ligadura, houve maior perda óssea alveolar significativamente (p<0.05). Em relação às concentrações de citocinas, os grupos que foram ovariectomizadas apresentaram concentrações maiores estatisticamente significante em relação aos demais (p<0.05). Conclusão: Assim pode-se concluir que a deficiência de estrógeno poderia contribuir para uma evolução mais rápida da perda óssea alveolar em ratas ovarietomizadas.
Aim: The relation of osteoporosis on the post-menopause is controversial; however, it can be a risk factor for the periodontal disease. Therefore, the aim of this study was to evaluate the influence of the estrogen deficiency on the periodontal tissues of female ovariectomized rat with induced periodontitis. Materials and methods: Forty rats with 8 weeks of life were randomly divided into 4 groups: 1) Control group; 2) Ligature group; 3) Ovariectomized group; 4) Ovariectomized and ligature group; that being that all the animals were treated in a standard diet and water available all time. When reaching 70 days of life, the animals were anesthetized and a periodontal disease induction was carried, after this procedure, when reaching 79 days of life, the rats were also submitted to anesthesia and went through the ovariectomy surgery. When reaching 100 days of life, the female rats were sacrificed, at when the left and right hemimandible of each rat were taken for radiographic and histomorphometric analysis, as the samples of the gingival tissue to evaluate the periodontal tissue. Results: The results highlighted that the radiographic and histomorphometric analysis of the lower alveolar bone first molars of the groups in which the induction of the periodontal disease by ligature, there was higher alveolar bone loss significantly (p<0.05). When it comes to the relation of the cytokine concentration, the groups that were ovariectomized presented significant higher concentration when compared to the others (p<0.05). Conclusion: In this way, we could conclude that the estrogen deficiency could contribute to the quicker evolution of the alveolar bone loss on female ovariectomized rats.
ABSTRACT
Aim: Few studies have been reported a correlation between periodontal disease and erectile dysfunction in men. The aim of the present study was to evaluate the sexual behaviour of adult male rats with experimental periodontitis. Materials and Methods: Fourteen male rats were divided into the following two groups: non-ligature, control (n = 7) and experimental with ligature (n = 7). The latter group had a ligature placed around each lower first molar for the development of experimental periodontitis. After 29 days of induction of periodontitis, the sexual behaviour of the male rats was recorded between 20:00-21:00, with lighting provided by a dim light. Initially, the males were placed in an observation cage for an adaption period of 900 seconds. After this time, a sexually receptive female was introduced into the cage with the male. On the thirtieth day the rats were sacrificed and samples of hemimandible were collected for radiographic analysis. Results: The rats in the ligature group showed a decrease (p < 0.05) in the intrusion frequency compared with the control group and ejaculation was not observed in the ligature group during the maximum recording time. It was confirmed that periodontitis was induced in the group with ligature due to the greater distance from the cementoenamel junction to the alveolar crest in the radiographic analysis (p <0.01). Conclusion: Experimental periodontitis may contribute to a reduction in the sexual behaviour of male rats.
ABSTRACT
OBJETIVO: Avaliar o desenvolvimento folicular em ratas Wistar com obesidade induzida por dieta de cafeteria (DCAF) submetidas à administração de losartan (LOS), um antagonista do receptor AT1 da Angiotensina II. MÉTODOS: Aos 21 dias de vida, as ratas foram separadas aleatoriamente em dois grupos: controle (CTL), que recebeu ração padrão, e cafeteria (CAF), que recebeu a DCAF, altamente palatável e calórica. Aos 70 dias de vida, início da idade reprodutiva, animais do grupo CAF foram subdivididos em dois grupos (n=15/grupo): CAF, que recebeu água, e CAF+LOS, que recebeu 30 mg/kg de peso corporal (PC) de LOS por gavagem durante 30 dias. O grupo CTL também recebeu água por gavagem. Aos 100 dias de vida foi realizada a eutanásia dos animais e o PC e das gorduras retroperitoneal, perigonadal e subcutânea foi avaliado. Os ovários direitos foram retirados para contagem do número dos diferentes tipos de folículos ovarianos. As concentrações plasmáticas dos hormônios folículo-estimulantes (FSH), luteinizante (LH), prolactina (PRL) e progesterona foram avaliadas. Os resultados foram expressos como média±erro padrão da média. Para análise estatística, foi utilizado one-way ANOVA, seguido pelo pós-teste de Newman-Keuls (p<0,05). RESULTADOS: O PC e das gorduras, assim como o número de folículos antrais, foi elevado no grupo CAF em relação ao CTL. Todavia, as concentrações de FSH e LH foram mais baixas entre os animais CAF. A administração de LOS reduziu o PC e das gorduras retroperitoneal e subcutânea, bem como o número de folículos antrais. O tratamento com LOS atenuou a redução das concentrações de FSH e de LH. As concentrações de progesterona e PRL foram semelhantes entre os grupos estudados. CONCLUSÃO: O uso de LOS pode favorecer o desenvolvimento folicular em fêmeas obesas e pode possibilitar sua utilização como fármaco coadjuvante no tratamento da infertilidade associada à obesidade. .
PURPOSE: To evaluate the follicular development of female Wistar rats with obesity induced by the cafeteria diet, submitted to the administration of losartan (LOS), an antagonist of the AT1 receptor of Angiotensin II. METHODS: At weaning (21 days of age), female Wistar rats were randomly divided, into two groups: control (CTL) that received standard chow and cafeteria (CAF) that received a cafeteria diet, a highly palatable and highly caloric diet. At 70 days of age, at the beginning of the reproductive age, animals of the CAF group were subdivided into two groups (n=15/group): CAF, that received water, and CAF+LOS, that received LOS for 30 days. The CTL group also received water by gavage. At 100 days of age, the animals were euthanized and body weight (BW) as well as the retroperitoneal, perigonadal and subcutaneous fat weights were analyzed. The right ovaries were isolated for counting the number of primary, secondary, antral and mature follicles. Plasma levels of FSH, LH, prolactin and progesterone hormones were analyzed. The results were expressed as mean±standard error of the mean. Data were analyzed statistically by one-way ANOVA followed by the Newman-Keuls post-test (p<0.05). RESULTS: BW and fat weight, as well as the number of antral follicles, were higher in the CAF group compared to the CTL group. However, FSH and LH levels were lower in CAF animals compared to CTL animals. LOS administration attenuated the reduction of FSH and LH levels. Progesterone and PRL levels were similar among groups. CONCLUSION: LOS could improve follicular development in obese females and could be used as an adjunctive drug in the treatment of infertility associated with obesity. .