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Prematuration Culture with Phosphodiesterase Inhibitors After Vitrification May Induce Recovery of Mitochondrial Activity in Vitrified Mouse Immature Oocytes.
Biopreservation and Biobanking 2018 August
This study investigates the possible causes for low development of blastocysts in vitrified immature oocytes by evaluating the changes of mitochondrial membrane potential and reactive oxygen species (ROS) production and finds a recovery mechanism for these conditions in vitrified immature oocytes. To recover from the cryoinjury, we cultured vitrified immature oocytes in milrinone containing medium for 1, 3, and 5 hours and then extended the culture for oocyte maturation. There was no difference in in vitro maturation and fertilization rate between fresh and vitrified/warmed oocytes. However, the development rate of blastocysts in vitrified/warmed oocytes was significantly lower than that in fresh oocytes (p < 0.05). The development rate of blastocysts was recovered if these oocytes were cultured for 3 hours in milrinone. Vitrified/warmed oocytes incubated in milrinone for 0 and 1 hour showed a significantly higher level of ROS (p < 0.05) and a significantly lower mitochondrial membrane potential (p < 0.05) than fresh oocytes. However, there was no significant difference (p > 0.05) between vitrified oocytes incubated in milrinone for 3 hours and fresh oocytes in terms of ROS level and mitochondrial membrane potential. In conclusion, alteration of highly polarized mitochondria distribution in vitrified oocytes may have an effect on mitochondrial activity, including ROS production during fertilization and further development. Preincubation in milrinone before in vitro maturation of immature vitrified/warmed oocytes may help the redistribution of highly polarized mitochondrial inner membrane potential and in reducing ROS and enhance the further embryonic development after fertilization.
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