Ontogeny of Gonadotropin-Inhibitory Hormone (GnIH) in the cichlid fish Cichlasoma dimerus

Journal of Neuroendocrinology
M P Di YorioP G Vissio

Abstract

RFamide peptides are expressed in the early stages of development in most vertebrates. Gonadotropin-inhibitory hormone (GnIH) belongs to the RFamide family, and its role in reproduction has been widely studied in adult vertebrates, ranging from fish to mammals. As only three reports evaluated GnIH during development, the aim of this study was to characterise the ontogeny of GnIH in a fish model, Cichlasoma dimerus. We detected the presence of two GnIH-immunoreactive (GnIH-ir) cell clusters with spatial and temporal differences. One cluster was observed by 3 days post-hatching (dph) in the nucleus olfacto-retinalis (NOR) and the other in the nucleus posterioris periventricularis by 14 dph. The number of GnIH-ir neurons increased in both nuclei, whereas their size increased only in the NOR from hatchling to juvenile stages. These changes occurred from the moment larvae started feeding exogenously and during development and differentiation of gonadal primordia. We showed by double-label immunofluorescence that only GnIH-ir neurons in the NOR co-expressed GnRH3 associated peptide. In addition, GnIH-ir fibre density increased in all brain regions from 5 dph. GnIH-ir fibres were also detected in the retina, optic tract and optic tect...Continue Reading

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Citations

Mar 7, 2019·Frontiers in Endocrinology·María P Di YorioPaula G Vissio
Jun 12, 2021·Molecular and Cellular Endocrinology·Mariela Faykoo-MartinezMelissa M Holmes
Jun 27, 2021·Fish Physiology and Biochemistry·Francisco Javier Toledo-SolísMiguel Angel Sáenz de Rodrigáñez
Oct 23, 2021·Frontiers in Neuroendocrinology·Paula G VissioJulieta E Sallemi

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