Entry into puberty is reflected in changes in hormone production but not in testicular receptor expression in Atlantic salmon (Salmo salar)
BACKGROUND: Puberty in male Atlantic salmon in aquaculture can start as early as after the first winter in seawater, stunts growth and entails welfare problems due to the maturation-associated loss of osmoregulation capacity in seawater. A better understanding of the regulation of puberty is the bas...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/388166 2023-12-03T10:19:28+01:00 Entry into puberty is reflected in changes in hormone production but not in testicular receptor expression in Atlantic salmon (Salmo salar) Schulz, Rüdiger W. Taranger, Geir Lasse Bogerd, Jan Nijenhuis, Wouter Norberg, Birgitta Male, Rune Andersson, Eva Sub Developmental Biology Developmental Biology 2019-12-01 image/pdf https://dspace.library.uu.nl/handle/1874/388166 en eng 1477-7827 https://dspace.library.uu.nl/handle/1874/388166 info:eu-repo/semantics/OpenAccess Photoperiod Puberty Spermatogenesis Gonadotropins Androgens Growth factors Hormone receptors Article 2019 ftunivutrecht 2023-11-08T23:16:05Z BACKGROUND: Puberty in male Atlantic salmon in aquaculture can start as early as after the first winter in seawater, stunts growth and entails welfare problems due to the maturation-associated loss of osmoregulation capacity in seawater. A better understanding of the regulation of puberty is the basis for developing improved cultivation approaches that avoid these problems. Our aim here was to identify morphological and molecular markers signaling the initiation of, and potential involvement in, testis maturation. METHODS: In the first experiment, we monitored for the first time in large Atlantic salmon males several reproductive parameters during 17 months including the first reproductive cycle. Since testicular growth accelerated after the Winter solstice, we focused in the second experiment on the 5 months following the winter solstice, exposing fish from February 1 onwards to the natural photoperiod (NL) or to continuous additional light (LL). RESULTS: In the first experiment, testis weight, plasma androgens and pituitary gonadotropin transcript levels increased with the appearance of type B spermatogonia in the testis, but testicular transcript levels for gonadotropin or androgen receptors did not change while being clearly detectable. In the second experiment, all males kept under NL had been recruited into puberty until June. However, recruitment into puberty was blocked in ~ 40% of the males exposed to LL. The first morphological sign of recruitment was an increased proliferation activity of single spermatogonia and Sertoli cells. Irrespective of the photoperiod, this early sign of testis maturation was accompanied by elevated pituitary gnrhr4 and fshb and testicular igf3 transcript levels as well as increased plasma androgen levels. The transition into puberty occurred again with stable testicular gonadotropin and androgen receptor transcript levels. CONCLUSIONS: The sensitivity to reproductive hormones is already established before puberty starts and up-regulation of testicular hormone receptor ... Article in Journal/Newspaper Atlantic salmon Salmo salar Utrecht University Repository |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Photoperiod Puberty Spermatogenesis Gonadotropins Androgens Growth factors Hormone receptors |
spellingShingle |
Photoperiod Puberty Spermatogenesis Gonadotropins Androgens Growth factors Hormone receptors Schulz, Rüdiger W. Taranger, Geir Lasse Bogerd, Jan Nijenhuis, Wouter Norberg, Birgitta Male, Rune Andersson, Eva Entry into puberty is reflected in changes in hormone production but not in testicular receptor expression in Atlantic salmon (Salmo salar) |
topic_facet |
Photoperiod Puberty Spermatogenesis Gonadotropins Androgens Growth factors Hormone receptors |
description |
BACKGROUND: Puberty in male Atlantic salmon in aquaculture can start as early as after the first winter in seawater, stunts growth and entails welfare problems due to the maturation-associated loss of osmoregulation capacity in seawater. A better understanding of the regulation of puberty is the basis for developing improved cultivation approaches that avoid these problems. Our aim here was to identify morphological and molecular markers signaling the initiation of, and potential involvement in, testis maturation. METHODS: In the first experiment, we monitored for the first time in large Atlantic salmon males several reproductive parameters during 17 months including the first reproductive cycle. Since testicular growth accelerated after the Winter solstice, we focused in the second experiment on the 5 months following the winter solstice, exposing fish from February 1 onwards to the natural photoperiod (NL) or to continuous additional light (LL). RESULTS: In the first experiment, testis weight, plasma androgens and pituitary gonadotropin transcript levels increased with the appearance of type B spermatogonia in the testis, but testicular transcript levels for gonadotropin or androgen receptors did not change while being clearly detectable. In the second experiment, all males kept under NL had been recruited into puberty until June. However, recruitment into puberty was blocked in ~ 40% of the males exposed to LL. The first morphological sign of recruitment was an increased proliferation activity of single spermatogonia and Sertoli cells. Irrespective of the photoperiod, this early sign of testis maturation was accompanied by elevated pituitary gnrhr4 and fshb and testicular igf3 transcript levels as well as increased plasma androgen levels. The transition into puberty occurred again with stable testicular gonadotropin and androgen receptor transcript levels. CONCLUSIONS: The sensitivity to reproductive hormones is already established before puberty starts and up-regulation of testicular hormone receptor ... |
author2 |
Sub Developmental Biology Developmental Biology |
format |
Article in Journal/Newspaper |
author |
Schulz, Rüdiger W. Taranger, Geir Lasse Bogerd, Jan Nijenhuis, Wouter Norberg, Birgitta Male, Rune Andersson, Eva |
author_facet |
Schulz, Rüdiger W. Taranger, Geir Lasse Bogerd, Jan Nijenhuis, Wouter Norberg, Birgitta Male, Rune Andersson, Eva |
author_sort |
Schulz, Rüdiger W. |
title |
Entry into puberty is reflected in changes in hormone production but not in testicular receptor expression in Atlantic salmon (Salmo salar) |
title_short |
Entry into puberty is reflected in changes in hormone production but not in testicular receptor expression in Atlantic salmon (Salmo salar) |
title_full |
Entry into puberty is reflected in changes in hormone production but not in testicular receptor expression in Atlantic salmon (Salmo salar) |
title_fullStr |
Entry into puberty is reflected in changes in hormone production but not in testicular receptor expression in Atlantic salmon (Salmo salar) |
title_full_unstemmed |
Entry into puberty is reflected in changes in hormone production but not in testicular receptor expression in Atlantic salmon (Salmo salar) |
title_sort |
entry into puberty is reflected in changes in hormone production but not in testicular receptor expression in atlantic salmon (salmo salar) |
publishDate |
2019 |
url |
https://dspace.library.uu.nl/handle/1874/388166 |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_relation |
1477-7827 https://dspace.library.uu.nl/handle/1874/388166 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1784266741683060736 |