Gonadotropin-inhibitory hormone (GnIH) in the amphibian brain and its relationship with the gonadotropin releasing hormone (GnRH) system: An overview

Arun G. Jadhao, Claudia Pinelli, Biagio D'Aniello, Kazuyoshi Tsutsui

    Research output: Contribution to journalArticle

    9 Citations (Scopus)

    Abstract

    It is well known that the hypothalamic neuropeptide gonadotropin-releasing hormone (GnRH) plays an important role as a primary factor regulating gonadotropin secretion in reproductive processes in vertebrates. The discovery of the presence of a gonadotropin-inhibitory hormone (GnIH) in the brains of birds has further contributed to our understanding of the reproduction control by the brain. GnIH plays a key role in inhibition of reproduction and acts on the pituitary gland and GnRH neurons via a novel G protein-coupled receptor (GPR147). GnIH decreases gonadotropin synthesis and release, thus inhibiting gonadal development and maintenance. The GnRH and GnIH neuronal peptidergic systems are well reported in mammals and birds, but limited information is available regarding their presence and localization in the brains of other vertebrate species, such as reptiles, amphibians and fishes. The aim of this review is to compile and update information on the localization of GnRH and GnIH neuronal systems, with a particular focus on amphibians, summarizing the neuroanatomical distribution of GnIH and GnRH and emphasizing the discovery of GnIH based on RFamide peptides and GnIH orthologous peptides found in other vertebrates and their functional significance.

    Original languageEnglish
    Pages (from-to)69-76
    Number of pages8
    JournalGeneral and Comparative Endocrinology
    Volume240
    DOIs
    Publication statusPublished - 2017 Jan 1

    Keywords

    • Gonadotropin-inhibitory hormone (GnIH)
    • Gonadotropin-releasing hormone (GnRH)
    • Neuropeptides
    • Pituitary
    • Reproduction
    • RFamide peptides

    ASJC Scopus subject areas

    • Endocrinology

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