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Oxytocin causes a sustained decrease in plasma levels of corticosterone in rats.

M Petersson1, A L Hulting, K Uvnäs-Moberg

  • 1Department of Molecular Medicine, Karolinska Hospital, Stockholm, Sweden. maria.petersson@fyfa.ki.se

Neuroscience Letters
|May 13, 1999
PubMed
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Oxytocin (OXT) has a dual effect on the HPA-axis in rats. Short-term, OXT increases ACTH and corticosterone; long-term, it inhibits corticosterone levels.

Area of Science:

  • Neuroendocrinology
  • Hormonal Regulation

Background:

  • The hypothalamic-pituitary-adrenal (HPA) axis is crucial for stress response.
  • Oxytocin (OXT) is a neuropeptide with diverse physiological roles.

Purpose of the Study:

  • To investigate the influence of oxytocin on ACTH and corticosterone plasma levels in rats.
  • To determine the short-term and long-term effects of OXT on HPA axis activity.

Main Methods:

  • Rats received single or repeated subcutaneous injections of OXT.
  • Plasma ACTH and corticosterone levels were measured.
  • HPA axis response to ACTH challenge and dexamethasone suppression was assessed.

Main Results:

  • A single OXT injection transiently increased ACTH and corticosterone.

Related Experiment Videos

  • Higher OXT doses (1 mg/kg) reduced corticosterone 6 hours post-injection.
  • Repeated OXT administration led to sustained corticosterone reduction.
  • OXT pretreatment did not alter corticosterone response to ACTH or dexamethasone.

    • Conclusions:

    • Oxytocin exhibits both stimulatory and inhibitory effects on the HPA axis.
    • These effects depend on the dosage, duration of administration, and time frame.
    • OXT modulates HPA axis activity in both short-term and long-term perspectives.