Ontogeny of gonadotrophin-inhibitory hormone in the cichlid fish Cichlasoma dimerus

RFamide peptides are expressed in the early stages of development in most vertebrates. Gonadotrophin-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. Because only 3 reports have evaluated...

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Detalles Bibliográficos
Publicado: 2018
Materias:
development
fish
GH
GnIH
GnRH
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09538194_v30_n6_p_DiYorio
http://hdl.handle.net/20.500.12110/paper_09538194_v30_n6_p_DiYorio
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_09538194_v30_n6_p_DiYorio
record_format dspace
spelling paper:paper_09538194_v30_n6_p_DiYorio2023-06-08T15:55:33Z Ontogeny of gonadotrophin-inhibitory hormone in the cichlid fish Cichlasoma dimerus development fish GH GnIH GnRH RFamide peptides are expressed in the early stages of development in most vertebrates. Gonadotrophin-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. Because only 3 reports have evaluated GnIH during development, the present study aimed to characterise the ontogeny of GnIH in the fish model Cichlasoma dimerus. We detected the presence of 2 GnIH-immunoreactive (-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 neurones increased in both nuclei, whereas their size increased only in the NOR from hatchling to juvenile stages. These changes occurred from the moment that larvae started feeding exogenously and during development and differentiation of gonadal primordia. We showed by double-label immunofluorescence that only GnIH-IR neurones in the NOR co-expressed gonadotrophin-releasing hormone 3 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 tectum, suggesting that GnIH acts as a neuromodulator of photoreception and the integration of different sensory modalities. Furthermore, there were GnIH-IR fibres in the pituitary from 14 dph, which were in close association with somatotrophs. Moreover, GnIH-IR fibres were observed in the saccus vasculosus from 30 dph, suggesting a potential role of GnIH in the modulation of its function. Finally, we found that gnih was expressed from 1 dph, and that the pattern of variation of its transcript levels was in accordance with that of cell number. The results of the present study comprise a starting point for the study of new GnIH roles during development. © 2018 British Society for Neuroendocrinology 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09538194_v30_n6_p_DiYorio http://hdl.handle.net/20.500.12110/paper_09538194_v30_n6_p_DiYorio
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic development
fish
GH
GnIH
GnRH
spellingShingle development
fish
GH
GnIH
GnRH
Ontogeny of gonadotrophin-inhibitory hormone in the cichlid fish Cichlasoma dimerus
topic_facet development
fish
GH
GnIH
GnRH
description RFamide peptides are expressed in the early stages of development in most vertebrates. Gonadotrophin-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. Because only 3 reports have evaluated GnIH during development, the present study aimed to characterise the ontogeny of GnIH in the fish model Cichlasoma dimerus. We detected the presence of 2 GnIH-immunoreactive (-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 neurones increased in both nuclei, whereas their size increased only in the NOR from hatchling to juvenile stages. These changes occurred from the moment that larvae started feeding exogenously and during development and differentiation of gonadal primordia. We showed by double-label immunofluorescence that only GnIH-IR neurones in the NOR co-expressed gonadotrophin-releasing hormone 3 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 tectum, suggesting that GnIH acts as a neuromodulator of photoreception and the integration of different sensory modalities. Furthermore, there were GnIH-IR fibres in the pituitary from 14 dph, which were in close association with somatotrophs. Moreover, GnIH-IR fibres were observed in the saccus vasculosus from 30 dph, suggesting a potential role of GnIH in the modulation of its function. Finally, we found that gnih was expressed from 1 dph, and that the pattern of variation of its transcript levels was in accordance with that of cell number. The results of the present study comprise a starting point for the study of new GnIH roles during development. © 2018 British Society for Neuroendocrinology
title Ontogeny of gonadotrophin-inhibitory hormone in the cichlid fish Cichlasoma dimerus
title_short Ontogeny of gonadotrophin-inhibitory hormone in the cichlid fish Cichlasoma dimerus
title_full Ontogeny of gonadotrophin-inhibitory hormone in the cichlid fish Cichlasoma dimerus
title_fullStr Ontogeny of gonadotrophin-inhibitory hormone in the cichlid fish Cichlasoma dimerus
title_full_unstemmed Ontogeny of gonadotrophin-inhibitory hormone in the cichlid fish Cichlasoma dimerus
title_sort ontogeny of gonadotrophin-inhibitory hormone in the cichlid fish cichlasoma dimerus
publishDate 2018
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_09538194_v30_n6_p_DiYorio
http://hdl.handle.net/20.500.12110/paper_09538194_v30_n6_p_DiYorio
_version_ 1768545198945599488

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