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The oxytocin receptor system: structure, function, and regulation.

G Gimpl1, F Fahrenholz

  • 1Institut für Biochemie, Johannes Gutenberg Universität, Mainz, Germany. gimpl.mail@uni-mainz.de

Physiological Reviews
|March 29, 2001
PubMed
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Oxytocin (OT) is a crucial hormone in reproduction, influencing uterine contractions, milk ejection, and social behaviors. Its complex regulation by steroids remains incompletely understood, impacting reproductive functions.

Area of Science:

  • Neuroendocrinology
  • Reproductive Biology
  • Molecular Endocrinology

Background:

  • Oxytocin (OT) is a neurohypophysial peptide vital for reproduction across vertebrates.
  • Synthesized in hypothalamic neurons and peripheral tissues, OT acts via a G protein-coupled receptor.
  • Its function is significantly influenced by steroid hormones, though regulatory mechanisms are not fully elucidated.

Purpose of the Study:

  • To review the multifaceted roles of oxytocin in reproductive processes.
  • To highlight the steroid-dependent regulation of the oxytocin system.
  • To identify gaps in understanding the molecular mechanisms governing oxytocin's actions.

Main Methods:

  • Literature review of oxytocin's function in reproduction.
  • Analysis of oxytocin gene expression and receptor characteristics.

Related Experiment Videos

  • Examination of steroid hormone influence on the oxytocin system.

    • Main Results:

    • Oxytocin regulates uterine contractions, milk ejection, estrous cycle, and male reproductive functions.
    • OT receptors require Mg(2+) and cholesterol for high-affinity binding.
    • Steroid regulation of the OT system is profound but poorly understood at the molecular level.
    • OT plays roles beyond reproduction, including cardiovascular and social behaviors.

    Conclusions:

    • Oxytocin is a key reproductive hormone with diverse functions.
    • The steroid-dependent regulation of the oxytocin system is complex and requires further investigation.
    • Clarifying the molecular actions of steroids on the OT system is essential for understanding its physiological regulation.