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No documento Volume 112 (páginas 29-33)

Os hormônios da tireóide desempenham um importante papel na regulação da foliculogênese ovariana. Um desbalanço na secreção dos

hormônios tireoidianos, seja por hipo

(hipotireoidismo) ou hiper (hipertireoidismo) secreção compromete a dinâmica folicular ovariana de modo reversível, ou seja, a função ovariana pode ser restabelecida a partir do equilíbrio da concentração sérica desses

hormônios (eutireóide). No entanto, os

mecanismos de ação dos hormônios T3 e T4 sobre a foliculogênese ovariana ainda não está bem esclarecido, principalmente no que tange as diferenças das atuações dos referidos hormônios por meio de vias genômicas e não genômicas. A compreensão do papel dos hormônios da

tireóide, poderá no futuro auxiliar no

desenvolvimento de meios de cultivo celular

eficazes para o desenvolvimento de folículos ovarianos in vitro.

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Tabela 1. Efeito dos hormônios tireoidianos (T3 e T4) sobre a foliculogênese ovariana in vitro.

* (conc): concentração; FSHrh: FSH recombinante humano; IGF-Irc: IGF-I

recombinante camundongo; CCOs: CCOs utilizados durante a MIV.

Espécie Estrutura ovariana Hormônios tireoidianos

(conc) Fator (es) associado (s) ao (s) hormônios tireoidianos (conc) Principais efeitos Referências

Caprina

Folículos primordiais e primários inclusos no córtex ovariano

T4 (20 ng/mL) FSHrh (10 ng/mL)

Insulina (10 µg/mL) Retardo na ativação de folículos primordiais Da Costa et al., 2015

Murina Folículo secundário isolado

(100-130 µm) T3 (1 nM)

FSHrh (10 ng/mL) Insulina bovina (5 µg/mL)

↑ diâmetro folicular

↑ expressão de RNAm Xiap (anti-apoptose) ↓ expressão de RNAm Bad (pro-apoptose)

Zhang et al., 2013

Murina Folículo secundário isolado

(150-180 µm) T3 (10-9 M)

FSHrh (10 ng/mL) Insulina bovina (5 µg/mL)

↑ diâmetro folicular

↑ expressão de RNAm e proteína GDG-9 ↑ expressão de RNAm FSHR

Kobayashi et al., 2009

Caprina (fetal)

Folículo secundário isolado (150-300 µm) T4 (1 µg/mL) - ↑ diâmetro folicular ↑ % folículos em crescimento ↑ formação de antro Amin et al., 2013 T4 (1 µg/mL) FSH (2 µg/mL) GH (1 mIU/mL) EGF (25 ng/mL) ↑ diâmetro folicular ↑ % folículos em crescimento ↑ formação de antro ↑ extrusão folicular

Ovina Folículo secundário isolado (150-250 µm) e (250-400 µm) T4 (1 µg/mL) - ↑ diâmetro folicular ↑ % folículos em crescimento ↑ extrusão folicular Arunakumari et al., 2007 T4 (1 µg/mL) FSH (2 µg/mL) ↑ diâmetro folicular ↑ % folículos em crescimento ↑ formação de antro ↑ extrusão folicular ↑ retomada da meiose

Ovina Folículo secundário isolado

(250-400 µm) T4 (1 µg/mL) FSH suíno (2 µg/mL) IGF-Irc (10 ng/mL) GH suíno (1 mIU/mL) ↑ diâmetro folicular ↑ % folículos em crescimento ↑ formação de antro ↑ extrusão folicular ↑ retomada da meiose ↑ embrião (2 células e mórula)

Arunakumari et al., 2010

Bovina CCOs† T3 (50 nM) FSH (0.5 µg/mL)

LH (5.0 µg/mL) ↑ blastocisto eclodido Costa et al., 2013

Bovina CCOs† T3 (50 ng/mL) T4 (50 ng/mL) E2 (1 µg/mL) FSH bovino (0.5 µg/mL) LH bovino (1 µg/mL) ↑ formação de blastocisto ↑ blastocisto eclodido ↑ número de células/blastocisto ↓ apoptose (blastocisto) Ashkar et al., 2010

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No documento Volume 112 (páginas 29-33)