title: Effects of dimethyl sulfoxide on asymmetric division and cytokinesis in mouse oocytes.
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.
  
  
  CONCLUSIONS
  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.
authors: Dongjie
authors: D
authors: Zhou
authors: Xinghui
authors: X
authors: Shen
authors: Yanli
authors: Y
authors: Gu
authors: Na
authors: N
authors: Zhang
authors: Tong
authors: T
authors: Li
authors: Xi
authors: X
authors: Wu
authors: Department of Histology and Embryology, Harbin Medical University, Harbin, China. Leiys2002@yahoo.com.
authors: Lei
authors: L
authors: Lei
mesh_terms: D008841:Actin Cytoskeleton / Q000378:metabolism; D000818:Animals; D018797:Cell Cycle Proteins / Q000235:genetics; D002478:Cells, Cultured; D003451:Cryoprotective Agents / Q000494:pharmacology; D048749:Cytokinesis / Q000187:drug effects* / Q000235:genetics; D004121:Dimethyl Sulfoxide / Q000494:pharmacology*; D004622:Embryo, Mammalian / Q000166:cytology / Q000196:embryology / Q000378:metabolism; D019855:Ethylene Glycol / Q000494:pharmacology; D005260:Female; D018507:Gene Expression Regulation, Developmental; D005990:Glycerol / Q000494:pharmacology; D008297:Male; D008540:Meiosis / Q000187:drug effects* / Q000235:genetics; D051379:Mice; D008810:Mice, Inbred C57BL; D008811:Mice, Inbred DBA; D018613:Microscopy, Confocal; D008869:Microtubule-Associated Proteins / Q000235:genetics; D008870:Microtubules / Q000378:metabolism; D009865:Oocytes / Q000166:cytology / Q000187:drug effects* / Q000378:metabolism; D051076:Proto-Oncogene Proteins c-fyn / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction; D020554:Sperm Injections, Intracytoplasmic; D020764:cdc42 GTP-Binding Protein / Q000235:genetics
chemical_list: D018797:Cell Cycle Proteins; D003451:Cryoprotective Agents; C533103:Hec1 protein, mouse; D008869:Microtubule-Associated Proteins; C494960:Fyn protein, mouse; D051076:Proto-Oncogene Proteins c-fyn; D020764:cdc42 GTP-Binding Protein; D019855:Ethylene Glycol; D005990:Glycerol; D004121:Dimethyl Sulfoxide