1. Effects of dimethyl sulfoxide on asymmetric division and cytokinesis in mouse oocytes
- Author
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Na Zhang, Lei Lei, Dongjie Zhou, Xing-Hui Shen, Yanli Gu, Xi Wu, and Tong Li
- Subjects
Glycerol ,Male ,Ethylene Glycol ,Cryoprotectant ,Cell Cycle Proteins ,Biology ,Proto-Oncogene Proteins c-fyn ,Microtubules ,Dimethyl sulfoxide (DMSO) ,Mice ,Polar body ,chemistry.chemical_compound ,Cryoprotective Agents ,Oocyte maturation ,medicine ,Animals ,Dimethyl Sulfoxide ,Sperm Injections, Intracytoplasmic ,cdc42 GTP-Binding Protein ,Spindle migration ,Cells, Cultured ,reproductive and urinary physiology ,Cytokinesis ,Microscopy, Confocal ,Reverse Transcriptase Polymerase Chain Reaction ,urogenital system ,Dimethyl sulfoxide ,Actin cap ,Gene Expression Regulation, Developmental ,Blastomere ,Embryo, Mammalian ,Oocyte ,Actin cytoskeleton ,Cell biology ,In vitro maturation ,Mice, Inbred C57BL ,Actin Cytoskeleton ,Meiosis ,medicine.anatomical_structure ,chemistry ,Cdc42 GTP-Binding Protein ,Mice, Inbred DBA ,Oocytes ,Asymmetric division ,Female ,Microtubule-Associated Proteins ,Research Article ,Developmental Biology - Abstract
Background: Dimethyl sulfoxide (DMSO) is used extensively as a permeable cryoprotectant and is a common solvent utilized for several water-insoluble substances. DMSO has various biological and pharmacological activities; however, the effect of DMSO on mouse oocyte meiotic maturation remains unknown. Results: In DMSO-treated oocytes, we observed abnormal MII oocytes that contained large polar bodies, including 2-cell–like MII oocytes, during in vitro maturation. Oocyte polarization did not occur, due to the absence of actin cap formation and spindle migration. These features are among the primary causes of abnormal symmetric division; however, analysis of the mRNA expression levels of genes related to asymmetric division revealed no significant difference in the expression of these factors between the 3% DMSO-treated group and the control group. After each “blastomere” of the 2-cell–like MII stage oocytes was injected by one sperm head respectively, the oocytes still possessed the ability to extrude the second polar body from each “blastomere” and to begin cleavage. However, MII oocytes with large polar bodies developed to the blastocyst stage after intracytoplasmic sperm injection (ICSI). Furthermore, other permeable cryoprotectants, such as ethylene glycol and glycerol, also caused asymmetric division failure. Conclusion: Permeable cryoprotectants, such as DMSO, ethylene glycol, and glycerol, affect asymmetric division. DMSO disrupts cytokinesis completion by inhibiting cortical reorganization and polarization. Oocytes that undergo symmetric division maintain the ability to begin cleavage after ICSI.
- Published
- 2014
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