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Related Experiment Videos

Chorionic gonadotropin secretion by human embryos in vitro.

D L Hay1, A Lopata

  • 1Department of Pathology, Royal Women's Hospital, Melbourne, Australia.

The Journal of Clinical Endocrinology and Metabolism
|December 1, 1988
PubMed
Summary

Human chorionic gonadotropin (hCG) production begins early in embryo development, specifically at the late blastocyst stage, and is amplified by serum. This marks a key event in early pregnancy following in vitro fertilization (IVF).

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Area of Science:

  • Reproductive biology
  • Developmental biology
  • Endocrinology

Background:

  • Embryos unsuitable for transfer or cryopreservation in IVF programs offer a unique model for studying early developmental events.
  • Human chorionic gonadotropin (hCG) is a critical hormone for establishing and maintaining early pregnancy.

Purpose of the Study:

  • To investigate the temporal relationship between early embryo development and human chorionic gonadotropin (hCG) secretion in vitro.
  • To determine the stage at which hCG production commences and how it is influenced by culture conditions.

Main Methods:

  • Culturing 38 human embryos unsuitable for standard IVF procedures for up to 14 days.
  • Monitoring hCG levels in the culture medium over time and correlating with observed embryo morphology and developmental stage.

Related Experiment Videos

  • Assessing the effect of serum supplementation on hCG secretion.

    • Main Results:

    • Significant hCG secretion was first detected by day 7 post-insemination in partially hatched blastocysts.
    • hCG levels increased approximately 50-fold after blastocyst attachment to the culture surface.
    • Serum addition amplified hCG secretion, while no significant free alpha or beta hCG was detected between days 6-12.

    Conclusions:

    • hCG production is initiated with the onset of cytotrophoblast differentiation, coinciding with the G1 phase in late blastocyst stage embryonic cells.
    • Embryo attachment and differentiation are critical for initiating hCG secretion, a key marker of early embryonic viability.