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Related Experiment Videos

Glycodelin: a pane in the implantation window.

M D Mueller1, J L Vigne, C Vaisse

  • 1Center for Reproductive Sciences, Department of Obstetrics, Gynecology and Reproductive Sciences, University of California, San Francisco School of Medicine, San Francisco, California, USA.

Seminars in Reproductive Medicine
|April 13, 2001
PubMed
Summary

Glycodelin, an endometrial protein, is crucial for human embryonic implantation. Its production by epithelial cells is stimulated by progestins and antiprogestins, but not estrogen, highlighting hormonal regulation in early pregnancy.

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Area of Science:

  • Reproductive biology
  • Endocrinology
  • Molecular genetics

Background:

  • Glycodelin is an endometrial protein implicated in the immunomodulatory processes of human embryonic nidation.
  • Understanding the hormonal regulation of glycodelin is essential for comprehending the mechanisms of successful embryo implantation.

Purpose of the Study:

  • To investigate the effects of ovarian hormones on glycodelin transcription, synthesis, and secretion by human epithelial cells.
  • To identify the regulatory elements within the human glycodelin gene promoter responsible for hormonal control.
  • To assess the role of relaxin in glycodelin production.

Main Methods:

  • Analysis of glycodelin transcription, synthesis, and secretion in human epithelial cells under various hormonal treatments (progestins, antiprogestins, estrogen).

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  • Identification and characterization of the 5' flanking region of the human glycodelin gene promoter.
  • In vitro studies to evaluate the effect of relaxin on glycodelin gene expression.

    • Main Results:

    • Glycodelin transcription, synthesis, and secretion were significantly stimulated by progestins and antiprogestins.
    • Estrogen did not show a stimulatory effect on glycodelin expression.
    • A 403-base-pair region in the 5' promoter of the human glycodelin gene was identified as crucial for progesterone receptor-mediated transcriptional activation.
    • Relaxin did not demonstrate any stimulatory effect on glycodelin gene expression in the in vitro models used.

    Conclusions:

    • Progestins and antiprogestins play a key role in regulating glycodelin expression in human epithelial cells, suggesting their importance in implantation.
    • Specific sequences within the glycodelin gene promoter mediate transcriptional activation by progesterone receptor-ligand complexes.
    • Contrary to previous suggestions, relaxin does not appear to directly stimulate glycodelin production in vitro.