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Decreased Expression of Inhibitor of DNA-binding (Id) Proteins and Vascular Endothelial Growth Factor and Increased Apoptosis in Ovarian Aging

  • Park, Min Jung (Center for Reproductive Medicine, Good Moonhwa Hospital) ;
  • Park, Sea Hee (Center for Reproductive Medicine, Good Moonhwa Hospital) ;
  • Moon, Sung Eun (Department of Obstetrics and Gynecology, Good Moonhwa Hospital) ;
  • Koo, Ja Seong (Department of Obstetrics and Gynecology, Good Moonhwa Hospital) ;
  • Moon, Hwa Sook (Department of Obstetrics and Gynecology, Good Moonhwa Hospital) ;
  • Joo, Bo Sun (Center for Reproductive Medicine, Good Moonhwa Hospital)
  • Received : 2013.01.18
  • Accepted : 2013.03.05
  • Published : 2013.03.31

Abstract

This study examined the expression of inhibitor of DNA-binding (Id) proteins and vascular endothelial growth factor (VEGF) in the ovary according to female age using a mice model as the first step in investigating the potential role of Ids and VEGF in ovarian aging. C57BL inbred female mice of three age groups (6-9, 14-16, and 23-26 weeks) were injected with 5 IU pregnant mare's serum gonadotropin (PMSG) in order to synchronize the estrus cycle. After 48 h, ovarian expression of Ids and VEGF was analyzed by reverse transcriptase-polymerase chain reaction (RT-PCR), western blot and immunohistochemistry. Ovarian apoptosis was examined by ovarian expression of Bcl-2 and Bcl-xL. Expression of Id-1 and VEGF was decreased with advancing female age, but not Id-2, Id-3, and Id-4. In particular, their expressions were significantly decreased in aged mice of 23-26 weeks compared with the young mice of 6-9 weeks (p < 0.05). In contrast, ovarian apoptosis was greatly increased in the aged mice compared to the young mice. This result suggests that Id-1 may have an implicated role in ovarian aging by associating with VEGF.

Keywords

References

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