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- W4200093463 abstract "The development of an adequate blood vessel network is crucial for the accomplishment of ovarian follicle growth and ovulation, which is necessary to support the proliferative and endocrine functions of the follicular cells. Although the Vascular Endothelial Growth Factor (VEGF) through gonadotropins guides ovarian angiogenesis, the role exerted by the switch on of Progesterone (P4) during the periovulatory phase remains to be clarified. The present research aimed to investigate in vivo VEGF-mediated mechanisms by inducing the development of periovulatory follicles using a pharmacologically validated synchronization treatment carried out in presence or absence of P4 receptor antagonist RU486. Spatio-temporal expression profiles of VEGF, FLT1, and FLK1 receptors and the two major MAPK/ERKs and PI3K/AKT downstream pathways were analyzed on granulosa and on theca compartment. For the first time, the results demonstrated that in vivo administration of P4 antagonist RU486 inhibits follicular VEGF receptors' signaling mainly acting on the theca layer by downregulating the activation of ERKs and AKTs. Under the effect of RU486, periovulatory follicles' microarchitecture did not move towards the periovulatory stage. The present evidence provides new insights on P4 in vivo biological effects in driving vascular and tissue remodeling during the periovulatory phase." @default.
- W4200093463 created "2021-12-31" @default.
- W4200093463 creator A5007088211 @default.
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- W4200093463 creator A5091332504 @default.
- W4200093463 date "2021-12-16" @default.
- W4200093463 modified "2023-10-07" @default.
- W4200093463 title "Effects of P4 Antagonist RU486 on VEGF and Its Receptors’ Signaling during the In Vivo Transition from the Preovulatory to Periovulatory Phase of Ovarian Follicles" @default.
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