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The primate placenta and human chorionic gonadotropin

W E Merz1

  • 1Department of Biochemistry II, University of Heidelberg, Germany.

Experimental and Clinical Endocrinology
|January 1, 1994
PubMed
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Human chorionic gonadotropin (hCG) is vital for early pregnancy. Its synthesis regulation, initiation, and down-regulation remain unclear, with potential roles for gonadoliberin, GABA, and autoregulation.

Area of Science:

  • Reproductive Biology
  • Endocrinology
  • Molecular Endocrinology

Background:

  • The primate placenta synthesizes peptide and proteohormones crucial for fetal development and maternal-fetal exchange.
  • Human chorionic gonadotropin (hCG), a bioactive glycoprotein hormone, is essential for maintaining pregnancy in the first trimester.
  • hCG is expressed by syncytiotrophoblasts in early human pregnancy and its production in cell culture indicates differentiation.

Purpose of the Study:

  • To elucidate the mechanisms controlling the initiation, maintenance, and down-regulation of human chorionic gonadotropin (hCG) synthesis during gestation.
  • To investigate the role of potential regulatory substances like gonadoliberin and gamma-aminobutyric acid in hCG biosynthesis.
  • To explore the involvement of LH/hCG receptors and the impact of glycosylation on hCG function and regulation.

Related Experiment Videos

Main Methods:

  • Analysis of hCG synthesis in placental tissue and cell cultures.
  • Investigation of the role of gonadoliberin and gamma-aminobutyric acid.
  • Characterization of LH/hCG receptor forms in first-trimester placenta and term placenta.
  • Experimental deglycosylation of hCG to assess conformational changes and functional properties.
  • Assessment of the impact of cAMP on hCG biosynthesis and glycosylation.

Main Results:

  • The precise control mechanisms for initiating and maintaining hCG synthesis, and its down-regulation at the end of the first trimester, are not fully understood.
  • Gonadoliberin and gamma-aminobutyric acid appear to play significant roles in hCG biosynthesis, analogous to central nervous system gonadotropin regulation.
  • Full-length LH/hCG receptors (80 kD) in term placenta suggest autoregulation, while truncated forms (50 kD) in early placenta and choriocarcinoma cells may impair hCG's negative feedback.
  • hCG glycosylation influences folding, stability, and receptor interaction; deglycosylation can induce antagonistic properties.
  • cAMP increases transcription and mRNA stability, enhances N-glycosylation capacity, and coordinates hCG biosynthesis, including post-translational modifications.

Conclusions:

  • The regulation of human chorionic gonadotropin (hCG) biosynthesis is complex, involving intrinsic placental stimulators, autoregulation via LH/hCG receptors, and post-translational modifications like glycosylation.
  • Understanding these regulatory pathways is crucial for comprehending pregnancy maintenance and potential therapeutic interventions.
  • cAMP plays a central role in coordinating hCG production, from gene expression to post-translational processing, highlighting its significance in placental function.