Distribution and change in number of gonadotropin-releasing hormone-1 neurons following activation of the photoneuroendocrine system in the chick, Gallus gallus

Cell and Tissue Research
W J Kuenzel, Christopher D Golden

Abstract

The photoneuroendocrine system (PNES) of chicks was activated by transferring birds to a long photoperiod and by giving them a diet supplemented with sulfamethazine (SMZ), a compound that augments the effect of long-day photostimulation. We wished to determine (1) the number of gonadotropin-releasing hormone-1 (GnRH-1) neurons in each identified nucleus (n.) in the subpallium and diencephalon and the major terminal fields (TFs) of GnRH-1 neurons, and (2) the effect of SMZ on the immunoreactive expression of GnRH-1 in perikarya. Four groups of birds were exposed to one of two light treatments, viz., light:dark (LD) cycles of LD20:4 or LD8:16, and given one of two rations, viz., control or one supplemented with SMZ (n=5/treatment). After 3 days, chicks were anesthetized, and their brains were prepared for immunocytochemistry with an antibody identifying GnRH-1 neurons. Seven areas or nuclei contained GnRH-1 neurons: paramedial septal n., preoptic periventricular n./periventricular hypothalamic n., bed n. of the pallial commissure (NCPa), parvocellular lateral and medial septal n., lateral septum near the ventral horn of the lateral ventricle, parvocellular lateral anterior thalamic n., and displaced thalamic neurons. Six TFs of G...Continue Reading

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Citations

Mar 8, 2013·Acta histochemica·Orn-anong ChaiyachetYupaporn Chaiseha
May 12, 2009·Brain Research Bulletin·Gemma GrahamTimothy Boswell
Mar 21, 2007·General and Comparative Endocrinology·Alistair Dawson, Peter J Sharp
Mar 29, 2007·Journal of Neuroendocrinology·A ThayananuphatM E El Halawani
Sep 30, 2014·The Journal of Comparative Neurology·Rajamani SelvamWayne J Kuenzel
Jun 16, 2009·General and Comparative Endocrinology·Hongyan LiWayne J Kuenzel
Dec 9, 2014·General and Comparative Endocrinology·Seong W Kang, Wayne J Kuenzel

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