Cited by 133Neuroendocrine regulation and behaviorStress Responses and CortisolNeuropeptides and Animal Physiology

Interaction between oestrogen and oxytocin on hypothalamic-pituitary-adrenal axis activity

Ochedalski, T., Subburaju, S., Wynn, P. C., Aguilera, G.·2007·Journal of Neuroendocrinology

Abstract

In addition to its role in reproduction, oxytocin has central actions modulating behavioural and hypothalamic-pituitary-adrenal (HPA) axis responses during late pregnancy and lactation. The hypothesis that ovarian hormones modulate the effects of oxytocin on HPA axis activity was studied in 7-day ovariectomised rats receiving oestradiol with or without progesterone replacement and intracerebroventricular (i.c.v) minipump infusion of oxytocin (100 ng/h). In an initial experiment, i.c.v. oxytocin had no effect on basal or restraint-stimulated plasma adrenocorticotrophic hormone (ACTH) and corticosterone concentrations or hypothalamic corticotrophin-releasing factor (CRF) mRNA expression with low oestradiol replacement alone but it had a stimulatory effect in the presence of low oestradiol and progesterone. To investigate further whether oestradiol modulates central actions of oxytocin, rats received low dioestrous (low), pro-oestrous (medium) or pregnancy (high) oestradiol replacement levels, yielding plasma concentrations of < 5, 17.3 +/- 4.5 and 258 +/- 32 pg/ml, respectively, with or without i.c.v. oxytocin. Oestradiol caused dose-dependent increases in basal plasma ACTH and corticosterone concentrations but decreased the ACTH response to restraint stress. In parallel to the changes in basal plasma ACTH, high oestrogen increased basal CRF hnRNA, CRF mRNA in the paraventricular nucleus and pro-opiomelanocortin (POMC) mRNA in the pituitary gland, while decreasing restraint stress-stimulated levels. Intracerebroventricular administration of oxytocin reduced basal and stress-stimulated plasma ACTH, hypothalamic CRF hnRNA (30 min), CRF mRNA and pituitary POMC mRNA (4 h) levels parallel to the increases induced by elevating plasma oestradiol. The present study demonstrates the converse effects of oestradiol on basal and restraint stress-stimulated basal HPA axis activity, and that the ability of central oxytocin to inhibit HPA axis activity depends on the levels of circulating oestradiol.

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Crossref · 10.1111/j.1365-2826.2006.01525.x

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Authors
Ochedalski, T., Subburaju, S., Wynn, P. C., & Aguilera, G.
Affiliations
  • National Institutes of Health (US)
  • The University of Sydney (AU)
Corresponding author
Aguilera, G.
Venue
Journal of Neuroendocrinology
Publisher
Wiley
Published
2007-01-08
Volume
19
Issue
3
Pages
189-197
ISSN
  • 0953-8194 (ISSN-L)
  • 1365-2826
OpenAlex
W2114431169
Cited by
133
References
64
Citations by year
2026: 1 · 2025: 5 · 2024: 8 · 2023: 8 · 2022: 5 · 2021: 10 · 2020: 7 · 2019: 3 · 2018: 10 · 2017: 6 · 2016: 3 · 2015: 9 · 2014: 6 · 2013: 9 · 2012: 5
FWCI
13.27
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Neuroendocrinology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Social Sciences › Psychology › Social Psychology › Neuroendocrine regulation and behavior
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
Keywords
oxytocin, estradiol, hypothalamic-pituitary-adrenal axis, ACTH, corticosterone, corticotropin-releasing factor, proopiomelanocortin, restraint stress, progesterone, ovariectomy, paraventricular nucleus, pregnancy, lactation, ovarian hormones
MeSH terms
Adrenocorticotropic Hormone, Analysis of Variance, Animals, Corticosterone, Corticotropin-Releasing Hormone, Dose-Response Relationship, Drug, Estradiol, Female, Hypothalamo-Hypophyseal System, Injections, Intraventricular, Oxytocin, Pituitary-Adrenal System, Progesterone, RNA, Messenger, Stress, Psychological, Rats, Sprague-Dawley, Statistics, Nonparametric, Rats

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