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Cytochalasin B treatment of mouse oocytes during intracytoplasmic sperm injection (ICSI) increases embryo survival without impairment of development

  • Li-li Hu (a1), Xing-hui Shen (a1), Zhong Zheng (a1), Zhen-dong Wang (a2), Zhong-hua Liu (a2), Lian-hong Jin (a3) and Lei Lei (a3)...


Intracytoplasmic sperm injection (ICSI) is a technique commonly used in clinical and research settings. In mouse oocytes, conventional ICSI has a poor survival rate caused by a high level of lysis. Cytochalasin B (CB) is a toxic microfilament-inhibiting agent that is known to relax the cytoskeleton and enhance the flexibility of oocytes. CB has been used widely in nuclear transfer experiments to improve the success rate of the micromanipulation, however information describing the use of CB in ICSI is limited. Here, we demonstrated that the addition of 5 μg/ml CB to the manipulation medium of ICSI procedure significantly improved the survival rate of the ICSI embryos (80.74% vs. 89.50%, p < 0.05), and that there was no harm for the in vitro or in vivo development. The birth rates and birth weights were not significantly different between the CB-treated and -untreated groups. Interestingly, the microfilaments of the ICSI embryos were almost undetectable immediately after CB treatment; however, they gradually re-appeared and had fully recovered to the normal level 2 h later. Moreover, CB did not disturb spindle rotation, second polar body formation or pronuclei migration, and had no effect on the microtubules. We thus conclude that ICSI manipulation in CB-containing medium results in significantly improved survival rate of mouse ICSI embryos, and that short-term treatment with CB during ICSI manipulation does not have adverse effects on the development of ICSI embryos.


Corresponding author

All correspondence to: Lian-hong Jin or Lei Lei. Department of Histology and Embryology, Harbin Medical University, 194 Xuefu Road, Nangang District, Harbin 150081, China. Tel: +86 451 86674518. Fax: +86 451 87503325. E-mail: or


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Cytochalasin B treatment of mouse oocytes during intracytoplasmic sperm injection (ICSI) increases embryo survival without impairment of development

  • Li-li Hu (a1), Xing-hui Shen (a1), Zhong Zheng (a1), Zhen-dong Wang (a2), Zhong-hua Liu (a2), Lian-hong Jin (a3) and Lei Lei (a3)...


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