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It is known that prostaglandin E2 (PGE2) plays a crucial role in the ovulation process. PGE2 mediates its actions through four subtypes of receptors designated EP1-EP4. However, the nature of the ovulation-promoting effect of PGE2 is not well understood. We have carried out this in vivo research utilizing a new selective EP4 receptor agonist (EP4A; APS-999 Na) to investigate its role in folliculogenesis aiming at more understanding of the biological mechanism of action of PGE2.

The selective prostaglandin EP4 agonist, APS-999 Na, induces follicular growth and maturation in the rat ovary