Cited by 10Circadian rhythm and melatoninNeuropeptides and Animal PhysiologyHypothalamic control of reproductive hormones

Testosterone-dependent and -independent mechanisms involved in the photoperiodic control of neuropeptide levels in the brain of the jerboa (Jaculus orientalis)

Oukouchoud, Rahma, Vivien-Roels, Berthe, Pévet, Paul, Lakhdar-Ghazal, Nouria·2003·Brain Research

Abstract

Vasoactive intestinal peptide (VIP) and neuropeptide Y (NPY) content in the suprachiasmatic nucleus have been shown to exhibit seasonal changes with an increase in late summer, the period of sexual quiescence in the jerboa (Jaculus orientalis). In this study, VIP content in the SCN and NPY and enkephaline (ENK) content in the geniculo-suprachiasmatic system have been assayed in wild-caught male jerboas (Jaculus orientalis) in order to determine whether these neuropeptides are controlled directly by photoperiod changes or indirectly by short photoperiod induced changes in circulating sex hormones levels. In agreement with previous studies seasonal variations occur in the VIP and NPY content in the SCN. Variations also occur in NPY content in the IGL with an increase in the period of sexual quiescence. In contrast, no seasonal changes are observed in Enk content in the IGL or the SCN. In short photoperiod conditions increases are observed in both VIP and NPY content in the SCN as well as NPY content in the IGL. Castration during the period of sexual activity (spring) or under long photoperiod which drastically reduces testosterone, also induced an increase in the levels of these neuropeptides. Testosterone implants which reproduce the sex hormonal status of the sexual activity period failed to prevent the short photoperiod-induced increase of VIP and NPY in the SCN and of NPY in the IGL. These results clearly show that the photoperiod modulates VIP and NPY in the geniculo-suprachiasmatic system both by testosterone-linked and testosterone-independent mechanisms.

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Crossref · 10.1016/s0006-8993(02)04213-0

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Authors
Oukouchoud, R., Vivien-Roels, B., Pévet, P., & Lakhdar-Ghazal, N.
Affiliations
  • Mohammed V University (MA)
  • Université de Strasbourg (FR)
Venue
Brain Research
Publisher
Elsevier BV
Published
2003-03
Volume
967
Issue
1-2
Pages
63-72
ISSN
0006-8993 (ISSN-L)
OpenAlex
W2028405012
Cited by
10
References
57
Citations by year
2023: 1 · 2021: 2 · 2020: 1 · 2017: 1 · 2013: 1 · 2012: 1
FWCI
0.24
Type
journal article
Language
en
Open access
closed
Locations
  • Brain Research (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
Keywords
photoperiod, testosterone, vasoactive intestinal peptide, neuropeptide Y, enkephalin, suprachiasmatic nucleus, seasonal variation, castration, testosterone implants, jerboa, Jaculus orientalis, sex hormones
MeSH terms
Animals, Brain, Male, Neuropeptides, Rodentia, Seasons, Suprachiasmatic Nucleus, Testosterone, Photoperiod

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