Aquisição da dependência de gonadotrofinas pelos folículos antrais iniciais e os desafios para promover o seu crescimento in vitro
DOI:
https://doi.org/10.1590/1809-6891v25e-75908EResumo
Esta revisão tem como objetivo discutir os principais fatores envolvidos no desenvolvimento de folículos antrais iniciais até a dependência de gonadotrofinas. Essa fase folicular é caracterizada por intensa proliferação de células da granulosa, formação de uma cavidade preenchida por líquido, diferenciação morfológica das células do cumulus, células da granulosa murais e recrutamento de células da teca. A interação entre oócito, células da granulosa e da teca é determinante para o crescimento folicular e produção hormonal. Fatores de crescimento produzidos pelo oócito, fator de crescimento e diferenciação-9 (GDF-9) e proteína morfogenética óssea-15 (BMP-15), regulam a proliferação e diferenciação de células da granulosa, e o desenvolvimento da cavidade antral, bem como estimulam a produção de receptores do hormônio folículo estimulante (FSH) nas células da granulosa. Em resposta ao FSH, as células da granulosa secretam o peptídeo natriurético tipo C (CNP), que atua através de seu receptor para aumentar a produção de monofosfato de guanosina cíclico (GMPc) e consequentemente o desenvolvimento folicular. As células da granulosa também produzem o fator de crescimento semelhante à insulina 1 (IGF-1) e aumentam a atividade da enzima aromatase, o que resulta em maior sensibilidade às gonadotrofinas e esteroidogênese folicular. A ausência de sinalização do IGF-1 causa cessação do crescimento folicular no início do estágio antral. Muitos outros fatores locais estão envolvidos na regulação do desenvolvimento folicular. Por tanto essa revisão traz dados relevantes para uma melhor compreensão dos mecanismos envolvidos no controle do crescimento de folículos antrais iniciais, enfatizando o papel dos fatores endócrinos e parácrinos, a interação oócito-células da granulosa e os processos de atresia folicular. Os desafios para o estabelecimento de sistemas de cultivo eficientes para o crescimento in vitro de folículos antrais iniciais também são discutidos.
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Este trabalho está licenciado sob uma licença Creative Commons Attribution 4.0 International License.
Autores que publicam nesta revista concordam com os seguintes termos:
- Autores mantém os direitos autorais e concedem à revista o direito de primeira publicação, com o trabalho simultaneamente licenciado sob a Licença Creative Commons Attribution que permite o compartilhamento do trabalho com reconhecimento da autoria e publicação inicial nesta revista.
- Autores têm autorização para assumir contratos adicionais separadamente, para distribuição não-exclusiva da versão do trabalho publicada nesta revista (ex.: publicar em repositório institucional ou como capítulo de livro), com reconhecimento de autoria e publicação inicial nesta revista.
- Autores têm permissão e são estimulados a publicar e distribuir seu trabalho online (ex.: em repositórios institucionais ou na sua página pessoal) a qualquer ponto antes ou durante o processo editorial, já que isso pode gerar alterações produtivas, bem como aumentar o impacto e a citação do trabalho publicado (Veja O Efeito do Acesso Livre).
