Cited by 56Hypothalamic control of reproductive hormonesCircadian rhythm and melatoninNeuropeptides and Animal Physiology

Changes in brain gonadotropin-releasing hormone- and vasoactive intestinal polypeptide-like immunoreactivity accompanying reestablishment of photosensitivity in male dark-eyed juncos (Junco hyemalis)

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Deviche, Pierre, Saldanha, Colin J., Silver, Rae·2000·General and Comparative Endocrinology

Abstract

In seasonally breeding, photoperiodic birds, the development of photorefractoriness is associated with decreased brain expression of gonadotropin-releasing hormone-like immunoreactivity (GnRH-li ir) and increased expression of vasoactive intestinal polypeptide-like immunoreactivity (VIP-li ir). Dissipation of photorefractoriness and reestablishment of photosensitivity are associated with increased GnRH-li ir brain production, but concurrent changes in VIP-li ir expression have not been investigated. To address this question, we compared the expression of VIP-li ir in the infundibulum (INF) of adult male dark-eyed juncos (Junco hyemalis) that were made photorefractory (PR) by prolonged exposure to long days with that of birds that were not photostimulated (PS), but had regained photosensitivity by exposure to short days for 5 (short-term-PS, ST-PS) or 13 (long-term-PS, LT-PS) consecutive months. Photosensitive males had smaller INF VIP-li ir cell bodies than PR males, but the numbers of INF VIP-li ir cells were independent of photoperiodic condition. Changes in infundibular VIP-li ir were correlated with changes in preoptic area (POA) GnRH-li expression. Specifically, photosensitive males had more and larger POA GnRH-li ir cells and more GnRH-li ir fibers in this region than PR males. Further, LT-PS males had more GnRH-li ir POA fibers and larger testes than ST-PS juncos. Thus, induction of photorefractoriness is associated with increased VIP and decreased GnRH brain expression whereas dissipation of photorefractoriness concurs with decreased VIP and increased GnRH brain expression. These results suggest a physiological role for VIP in the control of changes in GnRH expression as a function of the photosensitive condition.

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  1. Juss TS. Neuroendocrine and neural changes associated with the photoperiodic control of reproduction. In: Sharp PJ, editor. Avian Endocrinology. Bristol, UK: Society for Endocrinology; 1993. pp. 47–60. [Google Scholar]

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Authors
Deviche, P., Saldanha, C. J., & Silver, R.
Affiliations
  • University of Alaska Fairbanks (US)
  • University of California, Los Angeles (US)
  • Columbia University (US)
Corresponding author
Deviche, Pierre
Venue
General and Comparative Endocrinology
Publisher
Elsevier BV
Published
2000-01
Volume
117
Issue
1
Pages
8-19
ISSN
0016-6480 (ISSN-L)
OpenAlex
W2108672008
Cited by
56
References
56
Citations by year
2025: 1 · 2024: 1 · 2023: 1 · 2022: 1 · 2021: 1 · 2020: 2 · 2019: 2 · 2018: 3 · 2017: 2 · 2015: 3 · 2014: 3 · 2013: 2 · 2012: 1
FWCI
4.01
Type
journal article
Language
en
Open access
Locations
  • General and Comparative Endocrinology (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institute of Mental Health (R01MH029380)
Topics
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
Keywords
photorefractoriness, photoperiod, gonadotropin-releasing hormone, vasoactive intestinal peptide, dark-eyed junco, Junco hyemalis, infundibulum, preoptic area, seasonal reproduction, testicular volume
MeSH terms
Animals, Birds, Brain, Hypothalamus, Immunohistochemistry, Gonadotropin-Releasing Hormone, Light, Male, Pituitary Gland, Posterior, Preoptic Area, Reproduction, Seasons, Testis, Vasoactive Intestinal Peptide, Photoperiod

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