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Master's Dissertation
DOI
https://doi.org/10.11606/D.17.2017.tde-19072016-170123
Document
Author
Full name
Bruna Talita Gazeto Melo Jianini
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
Ribeirão Preto, 2015
Supervisor
Committee
Navarro, Paula Andrea de Albuquerque Salles (President)
Reis, Fernando Marcos dos
Silva, Ana Carolina Japur de Sá Rosa e
Title in Portuguese
O fluido peritoneal de mulheres inférteis com endometriose mínima/leve compromete o fuso meiótico de oócitos bovinos em metáfase II
Keywords in Portuguese
Endometriose mínima e leve
Fluido peritoneal
Fuso meiótico
Infertilidade feminina
Qualidade oocitária
Abstract in Portuguese
Os mecanismos etiopatogênicos da infertilidade relacionada à endometriose não estão bem elucidados, especialmente em mulheres com estágios iniciais da doença (mínima e leve), em que não são observadas alterações anatômicas expressivas na cavidade pélvica. Questionamos a possibilidade de haver alterações no microambiente peritoneal de mulheres inférteis com endometriose que poderiam afetar a aquisição da competência oocitária e dessa forma, comprometer a fertilidade natural dessas mulheres. Para ser competente, o oócito precisa estar maduro e ter um fuso meiótico morfologicamente normal e funcional, garantindo a fidelidade da segregação cromossômica durante as divisões da meiose. Nesse sentido, o objetivo do presente estudo foi comparar o potencial impacto de diferentes concentrações (1% e 10%) de fluido peritoneal (FP) de mulheres férteis sem endometriose e mulheres inférteis com endometriose mínima e leve (EI/II) sobre a integridade do fuso celular e alinhamento cromossômico de oócitos bovinos maturados in vitro. Realizou-se um estudo experimental, onde amostras de FP foram obtidas de 12 mulheres (6 mulheres férteis sem endometriose e 6 mulheres inférteis com endometriose mínima e leve) submetidas a videolaparoscopia, respectivamente, para realização de laqueadura tubária e investigação de infertilidade. Oócitos bovinos imaturos foram submetidos a maturação in vitro (MIV) na ausência de FP, na presença de 1% e 10% de FP de mulheres férteis sem endometriose e na presença de 1% e 10% de FP de mulheres inférteis com EI/II. Foram realizados 6 experimentos de MIV e cada amostra de FP foi utilizada em apenas um experimento. Os oócitos foram fixados, marcados por imunofluorescência e então analisados por microscopia confocal. A porcentagem de oócitos meioticamente normais foi significantemente maior nos oócitos submetidos a MIV na ausência de FP (88.46%) e na presença de 1% (78.57%) e 10% (84.62%) de FP de mulheres férteis sem endometriose do que aqueles oócitos submetidos a MIV na presença de 1% (62.50%) e 10% (56.25%) de FP de mulheres inférteis com EI/II. Além disso, no grupo endometriose, a porcentagem de oócitos meioticamente normais foi significantemente maior nos oócitos submetidos a MIV na presença de 1% (62.50%) do que na presença de 10% (56.25%) de FP, sugerindo um efeito dose-dependente do FP de mulheres com endometriose na ocorrência de danos meióticos oocitários. Demonstrou-se que o FP de mulheres inférteis com EI/II comprometeu a maturação nuclear oocitária durante a MIV, de modo dosedependente, promovendo anormalidades meióticas em oócitos em metáfase II. Nossos resultados contribuem para a compreensão dos mecanismos etiopatogênicos da infertilidade relacionada à EI/II e abrem perspectivas para o estudo de novas abordagens terapêuticas visando melhorar a fertilidade natural destas pacientes.
Title in English
Peritoneal fluid from infertile women with minimal/mild endometriosis compromises the meiotic spindle of metaphase II bovine oocytes
Keywords in English
Female infertility
Meiotic spindle
Minimal and mild endometriosis
Oocyte quality
Peritoneal fluid
Abstract in English
The etiopathogenic mechanisms of endometriosis-related infertility are not well elucidated, especially in women with early stages of the disease (minimal and mild endometriosis), where significant anatomical abnormalities in the pelvic cavity are not observed. We question if alterations in the peritoneal microenvironment of infertile women with endometriosis might affect oocyte competence acquisition and in this way, compromise the natural fertility in these women. To be competent, the oocyte must be mature and have a morphologically normal and functional meiotic spindle, which ensure the fidelity of chromosome segregation during the divisions of meiosis. Thus, the aim of the present study was to compare the potencial impact of different concentrations (1% and 10%) of peritoneal fluid (PF) from fertile women without endometriosis and infertile women with minimal and mild endometriosis (EI/II) on spindle integrity and chromosomes alignment of bovine oocytes in vitro matured (IVM). We performed an experimental study, where PF samples were obtained from 12 women (six fertile women without endometriosis and six infertile women with minimal and mild endometriosis) submitted to laparoscopy, respectively for tubal ligation and investigation of infertility. Immature bovine oocytes were submitted to IVM in the absence of PF, in the presence of 1% and 10% PF from fertile women without endometriosis and in the presence of 1% and 10% PF from infertile women with EI/II. We performed 6 experiments of IVM and each PF sample was used in only one experiment. The oocytes were fixed, immunofluorescence staining and then, analyzed by confocal microscopy. The percentage of meiotically normal oocytes was significantly higher for oocytes that underwent IVM in the absence of PF (88.46%) and in the presence of 1% (78.57%) and 10% (84.62%) PF from fertile women without endometriosis than for oocytes that underwent IVM in the presence of 1% (62.50%) and 10% (56.25%) PF from infertile women with EI/II. Furthermore, in the endometriosis group, the percentage of meiotically normal oocytes was significantly higher for oocytes that underwent IVM in the presence of 1% (62.50%) than in the presence of 10% (56.25%) PF, suggesting a dose-dependent effect of PF from women with endometriosis on the occurrence of meiotic oocyte damage. The study have demonstrated that PF from infertile women with EI/II compromised the oocyte nuclear maturation during the IVM, in a dosedependent manner, promoting meiotic abnormalities in metaphase II oocytes. Our results contribute to a better understanding of the etiopathogenic mechanisms of infertility related to EI/II and open perspectives in the design of new therapeutic approaches to improve the natural fertility of these infertile women
 
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Publishing Date
2017-04-03
 
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