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J Reprod Dev. 2010 Jun;56(3):356-61. Epub 2010 Mar 24.

Developmental ability of porcine in vitro matured oocytes at the meiosis II stage after vitrification.

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  • 1Laboratory of Developmental Engineering, Department of Life Sciences, School of Agriculture, Meiji University, Kanagawa, Japan.


The aim of the present study was to investigate whether a combination of cytoplasmic lipid removal (delipation) and treatment by a microtubule stabilizer, paclitaxel, would lead to efficient cryopreservation of porcine in vitro matured (IVM) oocytes at the meiosis II (MII) stage. Vitrification and subsequent re-warming and culture of 109 untreated oocytes produced only 9 blastocysts (8.3%). On the other hand, the post-vitrification blastocyst rate was significantly improved (21/113, 18.6%, P<0.05) when oocytes were treated with 1 microM paclitaxel. Oocyte delipation also significantly increased the post-vitrification blastocyst rate compared with the untreated group (15/37, 40.5%, P<0.05). The delipation-and-paclitaxel group exhibited a significantly higher blastocyst rate (34/75, 45.3%, P<0.05) than the paclitaxel group, although it was not significantly higher than that for the delipation group. In transfer experiment, a total of 109 (18.6%) parthenogenetic blastocysts were obtained from 586 oocytes vitrified with the delipation-and-paclitaxel treatment. Transfer of 72 blastocysts to two recipients resulted in 14 (19.4%) somite stage fetuses. In conclusion, we demonstrated for the first time that by removing cytoplasmic lipid droplets from oocytes and performing a microtubule stabilization procedure, vitrified porcine IVM MII-stage oocytes could efficiently develop to the blastocyst stage while retaining the ability to develop into fetuses.

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