Cellular Physiology and Biochemistry (May 2016)

Effects of Vitrification on Outcomes of In VivoMature, In Vitro-Mature and Immature Human Oocytes

  • Wen-yan Song,
  • Zhao-feng Peng,
  • Xue-mei Chen,
  • Hai-xia Jin,
  • Gui-dong Yao,
  • Sen-lin Shi,
  • Hong-yi Yang,
  • Xiang-yang Zhang,
  • Ying-pu Sun

DOI
https://doi.org/10.1159/000445564
Journal volume & issue
Vol. 38, no. 5
pp. 2053 – 2062

Abstract

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Background/Aims: To observe the effects of vitrification on spindle, zona pellucida, embryonic aneuploidy and DNA injury in in vivo-maruted, in vitro-mature and immature human oocytes. Methods: Between January 2009 and February 2015, 223 immature oocytes from 450 infertile patients, and 31 in vivo-mature oocytes from 3 infertile couples were collected. Of the 223 immature oocytes, 113 were used for in vitro culture before vitrification. Some oocytes were randomly divided into in vivo-mature group (group A, n = 15), in vitro-mature group (group B, n = 88) and immature group (group C, n = 85), and then the oocytes with spindle in these three groups after freezing-thawing were selected to use for Polscope imaging, embryonic aneuploidy screening and embryo development evaluation. Other oocytes were randomly divided into group A (n = 16), group B (n = 25) and group C (n = 25) for detecting DNA injury. Results: After thawing, spindle occurrence rate, spindle Retardance value, and cleavage rate were significantly higher in groups A and B than in group C (all P P > 0.05). Zona pellucida density (ZPD) was significantly lower in group A than in groups B and C both before and after vitrification (all P P P > 0.05). Rate of comet cells was significantly lower in group A than in groups B and C (all P P Conclusion: In vivo- and in vitro-mature human oocytes are more suitable to vitrification than immature human oocytes. Spindle Retardance value has more predictive value for embryonic development potential than ZPD and ZPT.

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