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Oocyte maturation in medaka is induced by the maturation-inducing hormone (MIH) via its membrane receptor. The most likely candidates for the membrane receptor are membrane progestin receptors (mPRs). In order to characterize the mPRα subtype of medaka, a human cell line expressing the mPRα gene of medaka was established and its steroid binding property was assessed. The α subtype exhibited high binding affinity for 17,20β-DHP, the MIH in medaka. Treatment with a morpholino antisense oligonucleotide to mPRα blocked oocyte maturation in vivo. These results suggest that the medaka mPRα protein acts as an intermediary during MIH-induced oocyte maturation in medaka in a manner similar to that described previously for fish species.

biomedical research

&lt;b&gt;Characterization of membrane progestin receptor α (mPRα) of the medaka and role in the induction of oocyte &lt;/b&gt;&lt;b&gt;maturation &lt;/b&gt;