Cited by 72Neuroendocrine regulation and behaviorHypothalamic control of reproductive hormonesRegulation of Appetite and Obesity

The regulation of oxytocin receptor binding in the ventromedial hypothalaimic nucleus by testosterone and its metabolites

JOHNSON, ALLAN E., COIRINI, HECTOR, INSEL, THOMAS R., McEWEN, BRUCE S.·1991·Endocrinology

Abstract

Oxytocin (OT) receptor binding in the ventromedial hypothalamic nucleus is regulated by testosterone (T) in male rats. However, T is metabolized in the brain, and many of the central effects of T are mediated by its metabolites. The experiments reported here were designed to determine whether T affects OT receptor binding directly or through the action of its metabolites 17 beta-estradiol and 5 alpha-dihydrotestosterone. Adult male rats were either sham operated or castrated and treated 1 week later with T propionate (TP), 17 beta-estradiol benzoate (EB), dihydrotestosterone benzoate (DHTB), DHTB plus EB, or oil. OT receptor binding was assessed autoradiographically using [125I]d(CH2)5[Tyr(Me)2,Thr4,Tyr-NH2(9)]OVT. In addition, seminal vesicle weights were measured as an index of androgenic activity. These experiments showed that TP and DHTB plus EB increased OT receptor binding in the ventromedial hypothalamic nucleus to the levels in intact males. Treatment with EB alone partially reinstated binding to the levels in intact males, while DHTB treatment was without effect. Castrated males treated with either TP or DHTB had seminal vesicle weights comparable to those of gonadally intact males and greater than those of animals in all other steroid conditions, indicating that sufficient levels of circulating steroids were attained in these groups. These data suggest that the induction of hypothalamic OT receptor binding by T is the result of the combined actions of estradiol and dihydrotestosterone. However, the mechanism underlying this interaction is unknown.

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Crossref · 10.1210/endo-128-2-891

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  • Androgens and progesterone modulate oxytocin and oxytocin receptor expression, while estrogens seem to have the greatest impact on the oxytocin system.

    “While androgens and progesterone modulate Oxt and Oxtr expression (72–75), it is the estrogens that seem to have the greatest impact on the Oxt system (68, 70, 74, 76–78).”

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Authors
JOHNSON, A. E., COIRINI, H., INSEL, T. R., & McEWEN, B. S.
Affiliations
National Institute of Mental Health (US)
Venue
Endocrinology
Published
1991-02
Volume
128
Issue
2
Pages
891-896
ISSN
  • 0013-7227 (ISSN-L)
  • 1945-7170
OpenAlex
W1965616857
Cited by
71
References
23
Citations by year
2025: 2 · 2023: 1 · 2022: 1 · 2021: 6 · 2019: 1 · 2018: 3 · 2017: 3 · 2016: 1 · 2015: 3 · 2014: 1 · 2013: 6 · 2012: 3
FWCI
8.01
Type
journal article
Language
en
Open access
closed
Locations
  • Endocrinology (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute of Neurological Disorders and Stroke (R01NS007080, NS 07080)
Topics
  • Social Sciences › Psychology › Social Psychology › Neuroendocrine regulation and behavior
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
Keywords
oxytocin receptor, ventromedial hypothalamus, testosterone, estradiol, dihydrotestosterone, androgen-estrogen interaction, castration, seminal vesicle weight, androgenic activity, male rats
MeSH terms
Animals, Autoradiography, Estradiol, Male, Orchiectomy, Oxytocin, Receptors, Cell Surface, Seminal Vesicles, Dihydrotestosterone, Testosterone, Ventromedial Hypothalamic Nucleus, Rats

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