Development and Reproduction (한국발생생물학회지:발생과생식)

The Korean Society of Developmental Biology (한국발생생물학회)
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Adaptive Transition of Aquaporin 5 Expression and Localization during Preimplantation Embryo Development by In Vitro Culture

  • Park, Jae-Won (Division of Developmental Biology and Physiology, School of Biosciences and Chemistry, Institute for Basic Sciences, Sungshin University) ;
  • Shin, Yun Kyung (Aquaculture Management Division, Aquaculture Research Institute, NFRDI) ;
  • Choen, Yong-Pil (Division of Developmental Biology and Physiology, School of Biosciences and Chemistry, Institute for Basic Sciences, Sungshin University)
  • Received : 2014.07.21
  • Accepted : 2014.08.08
  • Published : 2014.09.30
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Abstract

Adaptive development of early stage embryo is well established and recently it is explored that the mammalian embryos also have adaptive ability to the stressful environment. However, the mechanisms are largely unknown. In this study, to evaluate the possible role of aquaporin in early embryo developmental adaptation, the expression of aquaporin (AQP) 5 gene which is detected during early development were examined by the environmental condition. To compare expression patterns between in vivo and in vitro, we conducted quantitative RT-PCR and analyzed localization of the AQP5 by whole mount immunofluorescence. At in vivo condition, Aqp5 expressed in oocyte and in all the stages of preimplantation embryo. It showed peak at 2-cell stage and decreased continuously until morula stage. At in vitro condition, Aqp5 expression pattern was similar with in vivo embryos. It expressed both at embryonic genome activation phase and second mid-preimplantation gene activation phase, but the fold changes were modified between in vivo embryos and in vitro embryos. During in vivo development, AQP5 was mainly localized in apical membrane of blastomeres of 4-cell and 8-cell stage embryos, and then it was localized in cytoplasm. However, the main localization area of AQP5 was dramatically shifted after 8-cell stage from cytoplasm to nucleus by in vitro development. Those results explore the modification of Aqp5 expression levels and location of its final products by in vitro culture. It suggests that expression of Aqp5 and the roles of AQP5 in homeostasis can be modulated by in vitro culture, and that early stage embryos can develop successfully by themselves adapting to their condition through modulation of the specific gene expression and localization.

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References

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