Cited by 70Neuroendocrine regulation and behaviorHypothalamic control of reproductive hormonesNeuropeptides and Animal Physiology

Oxytocin in the medial preoptic area facilitates male sexual behavior in the rat

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Gil, Mario, Bhatt, Renu, Picotte, Katie B., Hull, Elaine M.·2011·Hormones and Behavior

Abstract

Oxytocin (OT) is a versatile neuropeptide that is involved in a variety of mammalian behaviors, and its role in reproductive function and behavior has been well established. The majority of pharmacological studies of the effects of OT on male sexual behavior have focused on the paraventricular nucleus (PVN), ventral tegmental area (VTA), hippocampus, and amygdala. Less attention has been given to the medial preoptic area (MPOA), a major integrative site for male sexual behavior. The present study investigated the effects of intra-MPOA administration of OT and (d(CH2)51, Tyr(Me)2, Thr4, Orn8, Tyr-NH29)-vasotocin, an OT antagonist (OTA), on copulation in the male rat. The relationship between OT receptor (OTR) binding levels in the MPOA and sexual efficiency was also explored. Microinjection of OT into the MPOA facilitated copulation in sexually experienced male rats, whereas similar injections of an OTA inhibited certain aspects of copulation but had no significant effect on locomotor activity in an open field. Contrary to expectation, sexually efficient males had lower levels of OTR binding in the rostral MPOA compared to inefficient animals. The present data suggest that OT activity in the MPOA is not necessary for the expression of male sexual behavior but is sufficient to facilitate copulatory behaviors and improve sexual efficiency in sexually experienced male rats. These data also suggest that OTR activity in the MPOA stimulates anogenital investigation, facilitates the initiation of copulation, and plays a role in the sensitization effect of the first ejaculation on subsequent ejaculations.

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Authors
Gil, M., Bhatt, R., Picotte, K. B., & Hull, E. M.
Affiliations
Florida State University (US)
Corresponding author
Gil, Mario
Venue
Hormones and Behavior
Publisher
Elsevier BV
Published
2011-04
Volume
59
Issue
4
Pages
435-443
ISSN
0018-506X (ISSN-L)
OpenAlex
W2159591827
Cited by
70
References
105
Citations by year
2025: 2 · 2024: 1 · 2023: 4 · 2022: 4 · 2021: 5 · 2020: 3 · 2019: 5 · 2018: 8 · 2017: 7 · 2016: 9 · 2015: 4 · 2014: 7 · 2013: 7 · 2012: 1
FWCI
7.42
Type
journal article
Language
en
Open access
Locations
  • Hormones and Behavior (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health
  • National Institute of Mental Health (R01MH040826, MH040826)
Topics
  • Social Sciences › Psychology › Social Psychology › Neuroendocrine regulation and behavior
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
Keywords
oxytocin, medial preoptic area, male sexual behavior, copulation, arginine vasotocin
MeSH terms
Analysis of Variance, Animals, Autoradiography, Copulation, Ejaculation, Male, Microinjections, Motor Activity, Oxytocin, Preoptic Area, Receptors, Oxytocin, Rats, Long-Evans, Rats

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