Izumi Hiroki, Miyamoto Yuki, Mori Tatsufumi, Hashigami Yuka, Chiba Yasutaka, Teramura Takeshi, Hashimoto Shu, Fukuda Kanji, Morimoto Yoshiharu, Hosoi Yoshihiko
Department of Biology Oriented Science and Technology Kinki University Wakayama Japan.
IVF Namba Clinic Osaka Japan.
Reprod Med Biol. 2013 Jun 21;12(4):179-185. doi: 10.1007/s12522-013-0157-x. eCollection 2013 Oct.
Current approaches to in vitro maturation (IVM) may result in low efficiency and inadequate quality of the oocytes due to insufficient cytoplasmic maturation. Although positive effects of the cysteamine supplementation in IVM medium for oocyte nuclear maturation or male pronuclear formation have been confirmed, it is still controversial whether the cysteamine addition affects embryo development after IVM. We aimed here to confirm the effect of cysteamine addition into IVM medium for subsequent embryo development in vitro.
We administered the cysteamine to the IVM culture of rabbit immature oocytes at various concentrations and observed the developmental rate, speed to reach blastocyst stage and cell numbers at the blastocyst stage.
Cysteamine supplementation improved developmental rate to blastocyst stage of the IVM oocytes. On the other hand, addition of glutathione (GSH) inhibitor buthionine sulfoximine inhibited GSH accumulation in the oocytes and subsequent embryo development to the blastocyst stage.
Controlling the GSH quantity of IVM oocytes may be an important factor for success of embryo development, and it is quite probable that a cysteamine supplementation can contribute to an increase of GSH content in oocyte.
由于细胞质成熟不足,目前的体外成熟(IVM)方法可能导致卵母细胞效率低下和质量欠佳。尽管已证实向IVM培养基中添加半胱胺对卵母细胞核成熟或雄原核形成具有积极作用,但添加半胱胺是否会影响IVM后的胚胎发育仍存在争议。我们的目的是在此确认向IVM培养基中添加半胱胺对后续体外胚胎发育的影响。
我们以不同浓度将半胱胺应用于兔未成熟卵母细胞的IVM培养,并观察发育率、达到囊胚阶段的速度以及囊胚阶段的细胞数量。
添加半胱胺提高了IVM卵母细胞发育至囊胚阶段的比率。另一方面,添加谷胱甘肽(GSH)抑制剂丁硫氨酸亚砜胺可抑制卵母细胞中GSH的积累以及随后胚胎发育至囊胚阶段。
控制IVM卵母细胞的GSH量可能是胚胎发育成功的一个重要因素,并且补充半胱胺很可能有助于增加卵母细胞中的GSH含量。