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Expression and Localization of Heat Shock Protein 70 in Frozen-thawed IVF and Nuclear Transferred Bovine Embryos  

Chung, K.S. (Animal Resources Research Center, Konkuk Univ)
Choi, Y.J. (Animal Resources Research Center, Konkuk University)
Song, S.J. (Animal Resources Research Center, Konkuk University)
Do, J.T. (Animal Resources Research Center, Konkuk University)
Yoon, B.S. (Animal Resources Research Center, Konkuk University)
Kim, Y.J. (Animal Resources Research Center, Konkuk University)
Lee, H.T. (Animal Resources Research Center, Konkuk University)
Publication Information
Korean Journal of Animal Reproduction / v.26, no.4, 2002 , pp. 311-320 More about this Journal
Abstract
The objective of this study was to assess the developmental potential in vitro produced embryos frozen-thawed with the various containers, and also examined expression and localization of heat shock protein 70 at these embryos. For the vitrification, 2-cell, 8-cell and blastocyst stage embryos produced by in vitro fertilization (IVF) and nuclear transfer (NT) were exposed the ethylene glycol 5.5 M freezing solution (EC 5.5) for 30 sec, loaded on each containers such EM grid, straw and cryo-loop, and then immediately plunged into liquid nitrogen. Thawed embryos were serially diluted in sucrose solution, each for 1 min. and cultured in CRI-aa medium. Survival rates of the vitrification production were assessed by re-expanded, hatched blastocysts. There were no differences in the survival rates of IVF using EM grid and cryo-loop. However, survival rates by straw were relatively lower than other containers. The use of cryo-loop resulted in only survival of nuclear transferred embryos (43.7%). Also, there embryos after IVF or NT were analysed by semi-quantitive reverse transcription-polymerase chain reaction (RT- PCR) methods for hsp 70 mRNA expression. Results revealed the expression of hsp 70 mRNh were higher thawed embryos than control embryos. Immunocytochemistry used to localize the hsp 70 protein in embryos. Two and 8-cell embryos derived under control condition was evenly distributed in the cytoplasm but appeared as aggregates in some frozen-thawed embryos. However, in the control, blastocysts displayed aggregate signal while Hsp70 in frozen-thawed blastocysts appeared to be more uniform In distribution. Therefore, this result suggests that the exploiting Hsp 70 in the early embryos may be role for protection of stress condition for increase viability of embryos within IVF, NT and there frozen-thawed embryos.
Keywords
Vitrification; Nuclear transfer; Hsp 70; Immnocytochmistry; RT-PCR;
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