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Metabolite availability as a window to view the early embryo microenvironment in vivo.

Authors
  • Hu, Kailun1
  • Yu, Yang1
  • 1 Department of Obstetrics and Gynecology, Peking University Third Hospital, Reproductive Medical Center, Beijing, People's Republic of China. , (China)
Type
Published Article
Journal
Molecular Reproduction and Development
Publisher
Wiley (John Wiley & Sons)
Publication Date
Oct 01, 2017
Volume
84
Issue
10
Pages
1027–1038
Identifiers
DOI: 10.1002/mrd.22868
PMID: 28722155
Source
Medline
Keywords
License
Unknown

Abstract

A preimplantation embryo exists independent of blood supply, and relies on energy sources from its in vivo environment (e.g., oviduct and uterine fluid) to sustain its development. The embryos can survive in this aqueous environment because it contains amino acids, proteins, lactate, pyruvate, oxygen, glucose, antioxidants, ions, growth factors, hormones, and phospholipids-albeit the concentration of each component varies by species, stage of the estrous cycle, and anatomical location. The dynamic nature of this environment sustains early development from the one-cell zygote to blastocyst, and is reciprocally influenced by the embryo at each embryonic stage. Focusing on embryo metabolism allowed us to identify how the local environment was deliberately selected to meet the dynamic needs of the preimplantation embryo, and helped reveal approaches to improve the in vitro culture of human embryos for improved implantation rates and pregnancy outcome.

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