Gonadotropin-releasing hormone neurones innervate kisspeptin neurones in the female mouse brain

Imre Kalló, Barbara Vida, Zsuzsanna Bardóczi, Anett Szilvásy-Szabó, Fruzsina Rabi, Tamás Molnár, Imre Farkas, Alain Caraty, Jens Mikkelsen, Clive W. Coen, Erik Hrabovszky, Zsolt Liposits

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10 Citations (Scopus)

Abstract

Kisspeptin (KP) neurones in the rostral periventricular area of the third ventricle (RP3V) and arcuate nucleus (Arc) are important elements in the neuronal circuitry regulating gonadotropin-releasing hormone (GnRH) secretion. KP and co-synthesised neuropeptides/neurotransmitters act directly on GnRH perikarya and processes. GnRH neurones not only form the final output pathway regulating the reproductive functions of the anterior pituitary gland, but also provide neuronal input to sites within the hypothalamus. The current double-label immunohistochemical studies investigated whether GnRH-immunoreactive (IR) projections to the RP3V and/or Arc establish morphological connections with KP-IR neurones at these sites. To optimise visualisation of KP immunoreactivity in, respectively, the RP3V and Arc, ovariectomised (OVX) oestrogen-treated and OVX oil-treated female mice were studied. Confocal laser microscopic analysis of immunofluorescent specimens revealed GnRH-IR axon varicosities in apposition to approximately 25% of the KP-IR neurones in the RP3V and 50% of the KP-IR neurones in the Arc. At the ultrastructural level, GnRH-IR neurones were seen to establish asymmetric synaptic contacts, which usually reflect excitatory neurotransmission, with KP-IR neurones in both the RP3V and Arc. Together with previous data, these findings indicate reciprocal connectivity between both of the KP cell populations and the GnRH neuronal system. The functional significance of the GnRH-IR input to the two separate KP cell populations requires electrophysiological investigation.

Original languageEnglish
Pages (from-to)281-289
Number of pages9
JournalNeuroendocrinology
Volume98
Issue number4
DOIs
Publication statusPublished - Mar 2014

Keywords

  • Anteroventral periventricular nucleus
  • Arcuate nucleus
  • Asymmetric synapses
  • Oestrogen
  • Reciprocal innervation
  • Rostral periventricular area of the third ventricle

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology
  • Endocrine and Autonomic Systems
  • Cellular and Molecular Neuroscience

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    Kalló, I., Vida, B., Bardóczi, Z., Szilvásy-Szabó, A., Rabi, F., Molnár, T., Farkas, I., Caraty, A., Mikkelsen, J., Coen, C. W., Hrabovszky, E., & Liposits, Z. (2014). Gonadotropin-releasing hormone neurones innervate kisspeptin neurones in the female mouse brain. Neuroendocrinology, 98(4), 281-289. https://doi.org/10.1159/000355623