Evidence for a daily rhythmicity in the acute release of luteinizing hormone in response to electrical stimulation in the Japanese quail

@article{Konishi2004EvidenceFA,
  title={Evidence for a daily rhythmicity in the acute release of luteinizing hormone in response to electrical stimulation in the Japanese quail},
  author={Hidehiko Konishi and Russell G. Foster and Brian Keith Follett},
  journal={Journal of Comparative Physiology A},
  year={2004},
  volume={161},
  pages={315-319}
}
SummaryThis study was undertaken to examine the effect of electrical stimulation of the hypothalamus at different times of day on luteinizing hormone (LH) secretion in male castrated quail on short days (8L∶16D). The posterior hypothalamus was stimulated with square-wave pulses of 80 μA for 2 min through chronically-implanted platinum microelectrodes. Stimulation was carried out on each quail at 4 (treatment A), 10 (B), or 14 h (C) after dawn. Plasma LH levels were increased markedly within 2… 
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24 Citations
Background Citations
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Methods Citations
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24 Citations

Citation Type

Citation Type

Rhythm‐Dependent Light Induction of the c‐fos Gene in the Turkey Hypothalamus
TLDR
Novel data is provided showing that the PMM in the caudal hypothalamus is involved in the neuronally mediated, light‐induced initiation of reproductive activity in the turkey hen.
Photoperiodic activation of Fos-like immunoreactive protein in neurones within the tuberal hypothalamus of Japanese quail
TLDR
The evidence supports the view that the neurones being activated are involved in a specific fashion in the avian photoperiodic response, with fos-like immunoreactive cells being maximal two days after the quail had been exposed to the single long day and when LH secretion was at its maximum.
Gonadotrophin‐Releasing Hormone Neurones in a Photoperiodic Songbird Express Fos and Egr‐1 Protein After a Single Long Day
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Results obtained suggest that photostimulation stimulates new protein synthesis in GnRH neurones on a relatively rapid time scale, and is consistent with the hypothesis that males may be more sensitive to photic cues.
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TLDR
This study is the first to show that activation of DAergic cells in the ML is associated with the activation of GnRH‐I and VIP neurones and the release of LH and PRL, and to establish that the reproductive neuroendocrine system was activated.
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TLDR
It is demonstrated that light-induced Dio2 expression in the MBH may be involved in the photoperiodic response of gonads in Japanese quail.
Dopamine-melatonin neurons in the avian hypothalamus controlling seasonal reproduction
Molecular mechanism of the photoperiodic response of gonads in birds and mammals.
  • T. Yoshimura
  • Biology
    Comparative biochemistry and physiology. Part A, Molecular & integrative physiology
  • 2006
Molecular and Neuroendocrine Mechanisms of Avian Seasonal Reproduction.
TLDR
Functional genomic analysis has revealed that long day (LD)-induced thyrotropin from the pars tuberalis of the pituitary gland causes local thyroid hormone (TH) activation within the mediobasal hypothalamus, and this local bioactive TH appears to regulate seasonal gonadotropin-releasing hormone (GnRH) secretion through morphological changes in neuro-glial interactions.
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References

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TLDR
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