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

  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},
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… 
Rhythm‐Dependent Light Induction of the c‐fos Gene in the Turkey Hypothalamus
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
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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Thyroid hormone and seasonal regulation of reproduction
Circadian clocks and the measurement of daylength in seasonal reproduction
Identification of Dopamine, Gonadotrophin‐Releasing Hormone‐I, and Vasoactive Intestinal Peptide Neurones Activated by Electrical Stimulation to the Medial Preoptic Area of the Turkey Hypothalamus: A Potential Reproductive Neuroendocrine Circuit
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Light-induced hormone conversion of T4 to T3 regulates photoperiodic response of gonads in birds
It is demonstrated that light-induced Dio2 expression in the MBH may be involved in the photoperiodic response of gonads in Japanese quail.
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.
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.


Electrical stimulation of the hypothalamus and luteinizing hormone secretion in Japanese quail.
Experiments were undertaken to localize those hypothalamic areas in the male quail where electrical stimulation would increase LH secretion, finding the relative increase in LH level was greatest in sexually immature quail and least in photostimulated castrated birds, although the highest absolute levels were seen in the castrated quail.
Induction of rapid testicular growth in Japanese quail by phasic electrical stimulation of the hypothalamic photosensitive area
It is concluded that in photoperiodic birds the principal factor which determines the magnitude of gonadal responses is not the intensity of the stimulus but its timing (circadian phase).
A photoperiodic response in gonadectomized Japanese quail exposed to a single long day.
Gonadectomized male Japanese quail maintained on short daylengths (8 h light:16 h darkness) showed a reliable and repeatable response, in terms of increased gonadotrophin secretion, to a single long
Electrophysiological recordings from oxytocinergic neurones during suckling in the unanaesthetized lactating rat.
It is established that the high frequency burst of electrical activity displayed by magnocellular neurones some 10-12s before milk ejection is responsible for oxytocin release under normal physiological circumstances.
Sites and action spectra for encephalic photoreception in the Japanese quail.
The data indicate that there are photoreceptive sites in and near the basal hypothalamus that, when illuminated directly, are capable of responding to a broad range of visible wavelengths.
Photoperiodism in quail: testicular growth and maintenance under skeleton photoperiods.
Testicular growth was induced in quail which were exposed to a skeleton photoperiod that included a pulse of light given during the dark period (night-interruption) that affected the degree of testicular development and gonadotrophin secretion.
Sexual differentiation of the photoperiodic response in Japanese quail.
Plasma levels of LH are generally higher in male than in female quail, and this dimorphism was found to persist in quail which had been through a breeding cycle and then gonadectomized, and the photoperiodic response system is sexually differentiated.
Disappearance rates of endogenous luteinizing hormone and chorionic gonadotropin in man.
Assessment of the rates of disappearance of endogenous LH and HCG from serum following complete surgical hypophysectomy and removal of the placenta found that the disappearance rates appear to follow a double exponential curve although there may be a possible additional exponential.
An investigation of the extraretinal photoreceptors mediating photoperiodic induction in the Japanese quail (Coturnix coturnix japonica)
  • PhD thesis,
  • 1984