Cited by 91Hypothalamic control of reproductive hormonesSexual Differentiation and DisordersNeuroendocrine regulation and behavior

Actions of testosterone in prepubertal and postpubertal male hamsters: dissociation of effects on reproductive behavior and brain androgen receptor immunoreactivity

Meek, Leslie R., Romeo, Russell D., Novak, Colleen M., Sisk, Cheryl L.·1997·Hormones and Behavior

Abstract

This study was conducted to determine whether there is a increase in responsiveness to the activating effects of testosterone on male reproductive behavior during puberty in male golden hamsters and whether responsiveness to behavioral actions of testosterone is correlated with the ability of testosterone to upregulate brain androgen receptor immunoreactivity (AR-ir). Sexually naive male hamsters were castrated at 21 or 42 days of age and implanted subcutaneously with a pellet containing 0, 2.5, or 5 mg of testosterone. One week later, males were given a 10-min mating test with a receptive female. Animals were euthanized 1 hr after the behavioral test, and blood samples and brains were collected. Plasma testosterone levels were equivalent in prepubertal and adult males that had been administered the same dose of testosterone. However, adult males exhibited more mounts, intromissions, and ejaculations than prepubertal males, demonstrating that postpubertal males are more responsive than prepubertal males to the effects of testosterone on sexual behavior. In both age groups, testosterone increased the number of AR-ir cells per unit area in several brain regions involved in male sexual behavior, including the medial preoptic nucleus (MPN), medial amygdala, posteromedial bed nucleus of the stria terminalis, and magnocellular preoptic nucleus (MPNmag). Surprisingly, testosterone increased AR-ir in the latter three regions to a greater extent in prepubertal males than in adults. Thus, prepubertal males are more responsive to the effects of testosterone on AR-ir in these regions. In a separate experiment, a pubertal increase in the number of AR-ir cells per unit area was found in both the MPN and MPNmag of intact male hamsters. These results indicate that a testosterone-dependent increase in brain AR during puberty may be necessary, but is not sufficient, to induce an increase in behavioral responsiveness to testosterone.

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Crossref · 10.1006/hbeh.1997.1371

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  • Recent studies demonstrate that organizational changes occur during adolescence and may be critical for activational changes to take place.

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Authors
Meek, L. R., Romeo, R. D., Novak, C. M., & Sisk, C. L.
Affiliations
Michigan State University (US)
Corresponding author
Sisk, Cheryl L.
Venue
Hormones and Behavior
Publisher
Elsevier BV
Published
1997-02
Volume
31
Issue
1
Pages
75-88
ISSN
0018-506X (ISSN-L)
OpenAlex
W2035916440
Cited by
91
References
45
Citations by year
2025: 1 · 2024: 2 · 2021: 4 · 2020: 2 · 2018: 1 · 2017: 1 · 2016: 5 · 2015: 4 · 2014: 5 · 2013: 8 · 2012: 7
FWCI
2.70
Type
journal article
Language
en
Open access
closed
Locations
  • Hormones and Behavior (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Kementerian Pendidikan Nasional
  • National Institutes of Health (1k04hd000950-01)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (HD-26483, R01HD026483, HD-00950)
Topics
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Sexual Differentiation and Disorders
  • Social Sciences › Psychology › Social Psychology › Neuroendocrine regulation and behavior
Keywords
testosterone, puberty, male reproductive behavior, androgen receptor, prepubertal males, golden hamster, medial preoptic nucleus, magnocellular preoptic nucleus, medial amygdala, bed nucleus of the stria terminalis, castration, testosterone implants, sexual behavior
MeSH terms
Animals, Brain, Female, Cricetinae, Immunohistochemistry, Male, Receptors, Androgen, Sexual Behavior, Animal, Sexual Maturation, Testosterone

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