Journal of Embryo Transfer (한국수정란이식학회지)

The Korean Society of Embryo Transfer (한국수정란이식학회)
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Toxicity Test of Sucrose and Trehalose Prior to Cryopreservation in Immature Bovine Oocytes

  • Park, Sang-Hyoun (College of Veterinary Medicine & Bio-Safety Research Institute, Chonbuk National University) ;
  • Yu, Il-Jeoung (College of Veterinary Medicine & Bio-Safety Research Institute, Chonbuk National University)
  • Published : 2008.12.31
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Abstract

The purpose of this study was to determine toxic effect of sucrose and trehalose prior to cryopreservation on nuclear maturation and embryonic development in immature bovine oocytes. All cryoprotectant was prepared in tissue culture medium 199-HEPES (TCM 199-HEPES) with 10% fetal bovine serum (FBS). Immature oocytes were exposed to 1.2M ethylene glycol (EG) and 0.1M sucrose or 1.2M EG and 0.1M trehalose for 3 min and then were exposed to 3.2 M EG and 0.25 M sucrose or 3.2 M EG and 0.25 M trehalose for 1 min. Oocytes treated with cryoprotectants were exposed to 0.25 M sucrose or 0.25 M trehalose for 5 min and then 0.1 M sucrose or 0.1 M trehalose for 5 min. Depending on type of sugar added to cryopreservation solution, oocytes were allocated to sucrose group and trehalose group, respectively. Oocytes exposed to TCM 199-HEPES with 10% FBS were considered as control. Oocytes were cultured in TCM 199 supplemented with 10% FBS, 5 ng/ml epidermal growth factor, 0.01 IU/ml luteinizing hormone, and $1\;{\mu}g/ml$ estradiol for 24 h in $39^{\circ}C$, 5% $CO_2$. Nuclear maturation was assessed by staining oocytes with 1% aceto-orcein. Oocytes were fertilized in vitro and were cultured in TCM 199 supplemented with 10% FBS, 5 mM sodium pyruvate, and antibiotics in $39^{\circ}C$, 5% $CO_2$. The rates of cleavage and blastocyst, and cell number in blastocyst were assessed. Metaphase II rates were not different among experimental groups regardless of type of sugar. The cleavage rate of trehalose group (73.3%) was significantly higher (p<0.05) than those of sucrose group (62.8%) and control group (60.8%). The blastocyst rate was significantly higher in trehalose group (p<0.05). Mean cell number in blastocyst were not different among experimental groups, although cell number of blastocyst in trehalose group was significantly higher on day 7 (p<0.05). In conclusion, sucrose and trehalose were not toxic to immature bovine oocytes prior to cryopreservation. In particular, trehalose was more effective on embryonic development.

Keywords

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