A influência do fumo sobre a morfologia ovariana de camundongos Swiss

• Autor(a) principal: Oliveira, Larissa Paixão Lucas de
• Data de Publicação: 2011
• 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/1/12733
• topic: Swiss mice; Estrous cycle; Cigarette smoke; Ovarian morphology; Camundongo Swiss; Ciclo estral; Fumaça de cigarro; Morfologia ovariana; CNPQ::CIENCIAS BIOLOGICAS::FISIOLOGIA::FISIOLOGIA DE ORGAOS E SISTEMAS::FISIOLOGIA ENDOCRINA

Nowadays greater number of Brazilian young women are smokers, and it is troubling because in their reproductive prime are the fastest growing population of smokers. Despite the fact that cigarette smoke is a well established health hazard, and systemic diseases are already well recognized, the potential deleterious effects on ovaries must be more investigated. Therefore, the aim of this study was to evaluate the effects of exposure to cigarette smoke on the estrous cycle and ovarian morphology. To this end, female Swiss mice were used, whose protocols were previously provided for the timing of three pubertal events and determination of the estrous cycle phases in this strain. Weanlings were examined daily and the date of vaginal opening was recorded. Daily vaginal lavages were begun on the day of vaginal opening and continued for the duration of the study. The onset of first cornification and cyclicity were measured. Animals were then observed for a total of 12 weeks. The ovarian effects of smoke exposure from cigarette 3R4F were studied in female Swiss mice (35 days old) for 15 day - 15E group. The control group (15C) stead in absence of smoke. At the end of this time, part of the animals in each group was sacrificed and right ovaries were collected. The others remained under observation for 30 days without exposure to smoke (45Ex group). The vaginal smear was determined throughout the experimental period. Ovaries were weighed and fixed for standard histology. The protocol provided a vaginal opening at 33,6±0,24 days old, the onset of first cornification at 39,4±2,58 days of age and the onset of cyclicity at 39,5±1,19 days old, concomitant with the appearance of first estrus. Furthermore, the estrous cycles were equal to 5 days in length. The less predominant smear type was diestrus. The length of estrous cycles increased significantly in mice exposed to cigarette smoke and estrus smear was more frequent. The number and diameter of large follicles were higher in 15E, while the corpora lutea was less frequent. The 45Ex group showed a decreasing trend of the ovarian weight, number of small follicles, the number and mean diameter of follicles, corpora lutea and the increase of atretic follicles. Comparison between controls and exposed animals throughout the time, showed a reduction in mean diameter of medium and large follicles. The protocols provided in this unit are indispensable for experimental research involving the reproductive system and the influence of the estrous cycle on non-reproductive functions in Swiss mice. The findings show that exposure to cigarette smoke results in alteration of the estrous cycle, ovarian weight and predict time dependent morphological changes that are signals of the end of reproductive life