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Significant decrease in parathyroid hormone-related protein concentrations in amniotic fluid with labour at term but

M D Mitchell1, C Hunter, D J Dudley

  • 1Department of Pharmacology and Clinical Pharmacology, University of Auckland, New Zealand.

Reproduction, Fertility, and Development
|January 1, 1996
PubMed
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Amniotic fluid parathyroid hormone-related protein (PTHrP) decreases during term labor, potentially due to reduced amnion production. This suggests different regulatory mechanisms for term versus preterm labor.

Area of Science:

  • Reproductive Endocrinology
  • Maternal-Fetal Medicine
  • Biochemistry

Background:

  • Parathyroid hormone-related protein (PTHrP) is present in amniotic fluid.
  • The role of PTHrP in labor and parturition is not fully understood.
  • Intrauterine tissue production of PTHrP requires investigation.

Purpose of the Study:

  • To determine if amniotic fluid PTHrP concentrations change during labor.
  • To identify intrauterine cells responsible for PTHrP production.
  • To explore potential differences in mechanisms controlling term and preterm labor.

Main Methods:

  • Amniotic fluid was collected from women in various stages of term and preterm labor, and from controls.
  • Amnion, chorion, and decidual cells were cultured and treated with interleukin-1 beta (IL-1 beta).

Related Experiment Videos

  • PTHrP levels in amniotic fluid and cell culture media were measured using an immunoradiometric assay.

    • Main Results:

    • Amniotic fluid PTHrP concentrations significantly decreased during term labor.
    • Preterm labor did not show significant changes in amniotic fluid PTHrP, though a trend for reduction was noted.
    • Amnion and chorion cells produced PTHrP, with production increasing after IL-1 beta stimulation; decidual cells did not produce detectable PTHrP.

    Conclusions:

    • Term labor is associated with reduced amniotic fluid PTHrP, possibly reflecting decreased amnion production.
    • Reduced PTHrP may play a role in the mechanisms of parturition.
    • Term and preterm labor appear to be regulated by distinct mechanisms.