Effects of removal of necrotic blastomeres from mouse cryopreserved embryos on blastocyst formation and hatching.
To evaluate whether the developmental potential of embryos that were partially damaged after freezing and thawing can be improved by removal of necrotic blastomeres. Eight-cell mouse embryos were cryopreserved using 1,2-propanediol and sucrose as cryoprotectant with slow cooling procedure. After thawing, blastocyst formation and hatching of fully intact embryos were compared between no treatment and with laser-assisted hatching. For partially intact embryos, the effects of removal of necrotic blastomeres with micromanipulation were evaluated. Laser-assisted hatching of mouse cryopreserved fully intact embryos significantly increased blastocyst hatching (63.4% versus 48.3%, P<0.05), but had little effect on blastocyst formation (72.0% versus 70.1%, P>0.05). The removal of necrotic blastomeres from partially damaged mouse cryopreserved embryos with micromanipulation significantly increased blastocyst formation (52.9% versus 32.0%, P<0.05) and blastocyst hatching (41.2% versus 22.0%, P>0.05) compared with the control group. The developmental potential of partially damaged cryopreserved embryos can be improved by removal of necrotic blastomeres with micromanipulation.
Liu
Wei-Xin
WX
Department of Physiology, Sichuan University, Chengdu 610041, China. liuweixind@163.com
Zheng
Yu
Y
Luo
Meng-Jun
MJ
Huang
Ping
P
Yue
Li-Min
LM
Wang
Li
L
He
Ya-Ping
YP
Zhang
Jin-Hu
JH
D000818:Animals; D001755:Blastocyst / Q000502:physiology*; D001757:Blastomeres / Q000473:pathology / Q000502:physiology*; D015925:Cryopreservation / Q000662:veterinary*; D004622:Embryo, Mammalian / Q000166:cytology*; D005260:Female; D007834:Lasers; D051379:Mice; D009336:Necrosis