title: Effect of different concentrations of recombinant leukemia inhibitory factor on different development stage of mouse embryo in vitro.
abstract: OBJECTIVE
  To assess the influence of different concentrations of recombinant human leukemia inhibitory factor (LIF) on the in vitro development of mouse embryos.
  
  
  METHODS
  The 2- to 4-cell embryos of CB6F1 mice were cultured in the human tubal fluid (HTF) media containing different concentrations of LIF. Mouse embryos were divided into seven groups: (1) HTF; (2) 1500 IU/ml LIF; (3) 1000 IU/ml LIF; (4) 750 IU/ml LIF; (5) 500 IU/ml LIF; (6) 250 IU/ml LIF; (7) 125 IU/ml LIF. The embryonic numbers of different stages including 5-8 cell, 9-16 cell, morula, blastocyst, and hatching blastocyst were recorded.
  
  
  RESULTS
  The percentage of early embryo stage (2-cell embryos to 6- to 16-cell stages) in all groups were nonsignificantly different. There were higher formation rates of preimplantation embryos (morula to hatching blastocyst) in groups 2, 3, 4, and 5 than in groups 1, 6 and 7.
  
  
  CONCLUSIONS
  LIF has positive effects on preimplantation embryo development and has nonsignificant influence on the early embryo development. The lowest concentration of LIF which could provide the optimal embryo development is 500 IU/ml.
authors.affiliation: Department of Obstetrics and Gynecology, China Medical College Hospital, Taichung, Taiwan.
authors.forename: H D
authors.initials: HD
authors.lastname: Tsai
authors.forename: C C
authors.initials: CC
authors.lastname: Chang
authors.forename: Y Y
authors.initials: YY
authors.lastname: Hsieh
authors.forename: L W
authors.initials: LW
authors.lastname: Hsu
authors.forename: S C
authors.initials: SC
authors.lastname: Chang
authors.forename: H Y
authors.initials: HY
authors.lastname: Lo
mesh_terms: D000818:Animals; D001755:Blastocyst / Q000187:drug effects; D002478:Cells, Cultured; D004305:Dose-Response Relationship, Drug; D004622:Embryo, Mammalian / Q000187:drug effects* / Q000196:embryology; D005260:Female; D006131:Growth Inhibitors / Q000494:pharmacology*; D006801:Humans; D015850:Interleukin-6; D053605:Leukemia Inhibitory Factor; D008222:Lymphokines / Q000494:pharmacology*; D051379:Mice; D009028:Morula / Q000187:drug effects; D011994:Recombinant Proteins / Q000494:pharmacology
chemical_list: D006131:Growth Inhibitors; D015850:Interleukin-6; C507837:LIF protein, human; D053605:Leukemia Inhibitory Factor; C507838:Lif protein, mouse; D008222:Lymphokines; D011994:Recombinant Proteins