Clinical and Experimental Reproductive Medicine

The Korean Society for Reproductive Medicine (대한생식의학회)
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Lifetime changes of the oocyte pool: Contributing factors with a focus on ovulatory inflammation

  • Park, Chan Jin (Department of Comparative Biosciences, College of Veterinary Medicine, University of Illinois Urbana-Champaign) ;
  • Oh, Ji-Eun (Department of Comparative Biosciences, College of Veterinary Medicine, University of Illinois Urbana-Champaign) ;
  • Feng, Jianan (Department of Comparative Biosciences, College of Veterinary Medicine, University of Illinois Urbana-Champaign) ;
  • Cho, Yoon Min (Department of Comparative Biosciences, College of Veterinary Medicine, University of Illinois Urbana-Champaign) ;
  • Qiao, Huanyu (Department of Comparative Biosciences, College of Veterinary Medicine, University of Illinois Urbana-Champaign) ;
  • Ko, CheMyong (Department of Comparative Biosciences, College of Veterinary Medicine, University of Illinois Urbana-Champaign)
  • Received : 2021.09.03
  • Accepted : 2022.02.11
  • Published : 2022.03.31
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Abstract

In mammalian species, females are born with a number of oocytes exceeding what they release via ovulation. In humans, an average girl is born with over a thousand times more oocytes than she will ovulate in her lifetime. The reason for having such an excessive number of oocytes in a neonatal female ovary is currently unknown. However, it is well established that the oocyte number decreases throughout the entire lifetime until the ovary loses them all. In this review, data published in the past 80 years were used to assess the current knowledge regarding the changing number of oocytes in humans and mice, as well as the reported factors that contribute to the decline of oocyte numbers. Briefly, a collective estimation indicates that an average girl is born with approximately 600,000 oocytes, which is 2,000 times more than the number of oocytes that she will ovulate in her lifetime. The oocyte number begins to decrease immediately after birth and is reduced to half of the initial number by puberty and almost zero by age 50 years. Multiple factors that are either intrinsic or extrinsic to the ovary contribute to the decline of the oocyte number. The inflammation caused by the ovulatory luteinizing hormone surge is discussed as a potential contributing factor to the decline of the oocyte pool during the reproductive lifespan.

Keywords

Acknowledgement

This study was supported by NIH HD094296 (CK), R00 HD082375 (HQ), and NSF SBIR 2052603 (CP).

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