Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Changes in Ovarian and Placental 20α-hydroxysteroid Dehydrogenase Activity during the Pregnancy in the Rat

  • Seong, H.H. (Division of Animal Biotechnology National Livestock Research Institute, RDA) ;
  • Min, K.S. (Graduate School of Bio. & Information Technology, Hankyong National University) ;
  • Kang, M.H. (Dept. of Food and Nutrition, Hoseo University) ;
  • Yoon, J.T. (Graduate School of Bio. & Information Technology, Hankyong National University) ;
  • Jin, H.J. (National Livestock Research Institute, RDA) ;
  • Chung, H.J. (National Livestock Research Institute, RDA) ;
  • Chang, W.K. (National Livestock Research Institute, RDA) ;
  • Yun, S.G. (National Livestock Research Institute, RDA) ;
  • Shiota, Kunio (Department of Veterinary Biochemistry, The University of Tokyo)
  • Received : 2002.09.02
  • Accepted : 2002.12.31
  • Published : 2003.03.01
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Abstract

The enzyme $20{\alpha}$-hydroxysteroid dehydrogenase ($20{\alpha}$-HSD) catabolizes progesterone to $20{\alpha}$-dihydroprogesterone ($20{\alpha}$-OHP), and is appeared in rat corpora luteal and placenta. A polled samples of 10-15 placental and ovarian tissues collected from each individual rat were subjected to measurement of $20{\alpha}$-HSD activity. A $20{\alpha}$-HSD activity in the cytosol fraction was based on the generation of NADPH. In this study, it is designed to study cytosolic $20{\alpha}$-HSD activity in rat ovarian and placenta during pregnancy, and its relationship to embryonic mortality. It was found that from days 5 to 18 of pregnancy the $20{\alpha}$-HSD activities steady by decreased but at parturition time rapidly increased in ovary. On the other hand, placental cytosolic $20{\alpha}$-HSD activities were high detected from days 8 to 10 of pregnancy, not detectable from days 11 to 20 of pregnancy, but again very high at the time of parturition. Analysis of DEAE column chromatography revealed that two different types of $20{\alpha}$-HSD (HSD-1 and HSD-2) were found with similar activity in the placental cytosol on day 10 of pregnancy. The number of fetuses on day 10 of pregnancy was 15.4 and decreased significantly to 12.9 on day 12. The results suggested that expression of $20{\alpha}$-HSD in the placental tissues seems to be related the number of fetal survived in the specific time (days 11 and 12) which spontaneous fetal loss occurs.

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References

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