title: [Effects of modification of the nutritional components in potassium simplex optimized medium on preimplantation development and cleavage of mouse embryos in vitro].
abstract: OBJECTIVE
  To solve the problem known as 2-cell block in in vitro culture of preimplantation embryos, modification of the nutritional components in potassium simplex optimized medium (KSOM) was attempted and the preimplantation development and cleavage of mouse embryos in such medium observed.
  
  
  METHODS
  One-cell mouse embryos collected from the oviduct of the superovulated mice were cultured in microdrops of different culture media for 5 days [144 h after human chorionic gonadotrophin (hCG) injection], and the percentages of embryos developed to pre-blastocyst, unhatched blastocyst, partially hatched blastocyst and completely hatched blastocyst were recorded at deferent time points (96, 120 and 144 h post-hCG) and total cell number of blastocysts at 120 h post-hCG counted. With these indices as the evaluation criteria, we evaluated the modifications of the concentrations of glucose (0.2, 5.56 mmol/l), bovine serum albumin (BSA, 1 and 4 mg/ml), and amino acids (1/2X NEAA and EAA, or not) in KSOM for their effect on the development of Kunming mouse zygotes in vitro.
  
  
  RESULTS
  Increasing the concentration of glucose and BSA was not shown to have significant effects on the rate of blastocyst formation at 120 h post-hCG or the total cell counts in KSOM without amino acids. After supplementation of the medium with amino acids, the rate of partially and completely hatched blastocyts was significantly increased in KSOM or KSOM supplemented with high concentrations of glucose and BSA (KSOMGB). Glucose at the high concentration of 5.56 mmol/L did not inhibit the development of mouse zygotes to hatched blastocysts cultured in KSOM supplemented with amino acids.
  
  
  CONCLUSIONS
  Increasing the concentration of glucose and BSA and amino acids in KSOM can promote the preimplantation development of mouse zygotes in in vitro culture.
authors.affiliation: Department of Histology and Embryology, Southern Medical University, Guangzhou 510515, China.
authors.forename: Wu-Jian
authors.initials: WJ
authors.lastname: Huang
authors.forename: Jin
authors.initials: J
authors.lastname: Yuan
authors.forename: Xing
authors.initials: X
authors.lastname: Deng
authors.forename: Jing
authors.initials: J
authors.lastname: An
mesh_terms: D000596:Amino Acids / Q000494:pharmacology*; D000818:Animals; D006063:Chorionic Gonadotropin / Q000494:pharmacology; D003470:Culture Media / Q000494:pharmacology*; D004622:Embryo, Mammalian; D047108:Embryonic Development / Q000187:drug effects*; D005260:Female; D008297:Male; D051379:Mice; D009924:Organ Culture Techniques; D011188:Potassium / Q000494:pharmacology; D012710:Serum Albumin, Bovine / Q000494:pharmacology
chemical_list: D000596:Amino Acids; D006063:Chorionic Gonadotropin; D003470:Culture Media; D012710:Serum Albumin, Bovine; D011188:Potassium