Review: Melatonin stimulates the synthesis and release of gonadotropin-inhibitory hormone in birds

Vishwajit S. Chowdhury, Takayoshi Ubuka, Kazuyoshi Tsutsui

研究成果: Contribution to journalShort survey査読

28 被引用数 (Scopus)

抄録

Gonadotropin-inhibitory hormone (GnIH), a neuropeptide that inhibits gonadotropin synthesis and release, was first identified in the quail hypothalamus. To understand the physiological role of GnIH, this review will demonstrate the mechanisms that regulate GnIH synthesis and release. Pinealectomy (Px) combined with orbital enucleation (Ex) decreased the synthesis of GnIH precursor mRNA and content of mature GnIH peptide in the diencephalon. Melatonin administration to Px plus Ex birds caused a dose-dependent increase in the synthesis of GnIH precursor mRNA and production of mature peptide. A melatonin receptor subtype, Mel1c, was expressed in GnIH-immunoreactive neurons, suggesting direct action of melatonin on GnIH neurons. Melatonin administration further increased GnIH release in a dose-dependent manner from hypothalamic explants in vitro. GnIH mRNA expression and GnIH release during the dark period were greater than those during the light period in explants from quail exposed to long-day photoperiods. Conversely, plasma luteinizing hormone (LH) concentration decreased during the dark period. This review summarizes that melatonin appears to act on GnIH neurons in stimulating not only GnIH synthesis but also its release, thus inhibiting plasma LH concentration in birds.

本文言語英語
ページ(範囲)175-178
ページ数4
ジャーナルGeneral and Comparative Endocrinology
181
1
DOI
出版ステータス出版済み - 1 5 2013

All Science Journal Classification (ASJC) codes

  • 動物科学および動物学
  • 内分泌学

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