LH secretion and ovulation following exposure of Arctic charr to different temperature and photoperiod regimes : Responsiveness of females to a gonadotropin releasing hormone analogue and a dopamine antagonist
International audience The timing of ovulation and LH plasma levels were investigated in Arctic charr reared at 5 °C and 10 °C, exposed to the ambient photoperiod, or short or long-day photoperiod regimes during the prespawning period. The effectiveness of sGnRHa alone, or sGnRHa combined with a dop...
Published in: | General and Comparative Endocrinology |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | https://hal.inrae.fr/hal-02661344 https://doi.org/10.1016/j.ygcen.2009.03.005 |
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ftccsdartic:oai:HAL:hal-02661344v1 2023-05-15T14:29:56+02:00 LH secretion and ovulation following exposure of Arctic charr to different temperature and photoperiod regimes : Responsiveness of females to a gonadotropin releasing hormone analogue and a dopamine antagonist Gillet, Christian, Breton, Bernard Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL) Institut National de la Recherche Agronomique (INRA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry ) Station commune de Recherches en Ichtyophysiologie, Biodiversité et Environnement (SCRIBE) Institut National de la Recherche Agronomique (INRA) 2009 https://hal.inrae.fr/hal-02661344 https://doi.org/10.1016/j.ygcen.2009.03.005 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.ygcen.2009.03.005 hal-02661344 https://hal.inrae.fr/hal-02661344 doi:10.1016/j.ygcen.2009.03.005 PRODINRA: 32230 WOS: 000266320800012 ISSN: 0016-6480 EISSN: 1095-6840 General and Comparative Endocrinology https://hal.inrae.fr/hal-02661344 General and Comparative Endocrinology, Elsevier, 2009, 162 (2), pp.210-218. ⟨10.1016/j.ygcen.2009.03.005⟩ Arctic charr fish [SDV.MHEP.EM]Life Sciences [q-bio]/Human health and pathology/Endocrinology and metabolism info:eu-repo/semantics/article Journal articles 2009 ftccsdartic https://doi.org/10.1016/j.ygcen.2009.03.005 2021-08-07T23:01:32Z International audience The timing of ovulation and LH plasma levels were investigated in Arctic charr reared at 5 °C and 10 °C, exposed to the ambient photoperiod, or short or long-day photoperiod regimes during the prespawning period. The effectiveness of sGnRHa alone, or sGnRHa combined with a dopamine antagonist, in stimulating LH secretion and inducing ovulation was also investigated. With the natural photoperiod, ovulation occurred spontaneously at 5 °C, but was inhibited at 10 °C. A transition from 10 to 5 °C soon resulted in suppression of the inhibition. At 5 °C, the effectiveness of sGnRHa was similar to that of sGnRHa combined with pimozide in stimulating LH secretion and inducing ovulation. At 10 °C, sGnRHa + pimozide was more effective that sGnRHa alone in stimulating LH secretion and inducing a high rate of ovulation, suggesting that dopamine-induced inhibition of LH secretion could occur naturally in Arctic charr at 10 °C. Exposure of Arctic charr to a long day (LD) photoperiod regime in fall and winter did not completely inhibit ovulation, but markedly delayed it and prolonged the ensuing ovulation period. The LD photoperiod also reduced LH plasma levels in females while they were ovulating, but did not modify the responsiveness of the pituitary to GnRHa stimulation compared to a control group exposed to a short-day (SD) photoperiod. There was an interval of several weeks after a transition from LD to SD before LH secretion and ovulation were stimulated. Article in Journal/Newspaper Arctic charr Arctic Human health Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic General and Comparative Endocrinology 162 2 210 218 |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
Arctic charr fish [SDV.MHEP.EM]Life Sciences [q-bio]/Human health and pathology/Endocrinology and metabolism |
spellingShingle |
Arctic charr fish [SDV.MHEP.EM]Life Sciences [q-bio]/Human health and pathology/Endocrinology and metabolism Gillet, Christian, Breton, Bernard LH secretion and ovulation following exposure of Arctic charr to different temperature and photoperiod regimes : Responsiveness of females to a gonadotropin releasing hormone analogue and a dopamine antagonist |
topic_facet |
Arctic charr fish [SDV.MHEP.EM]Life Sciences [q-bio]/Human health and pathology/Endocrinology and metabolism |
description |
International audience The timing of ovulation and LH plasma levels were investigated in Arctic charr reared at 5 °C and 10 °C, exposed to the ambient photoperiod, or short or long-day photoperiod regimes during the prespawning period. The effectiveness of sGnRHa alone, or sGnRHa combined with a dopamine antagonist, in stimulating LH secretion and inducing ovulation was also investigated. With the natural photoperiod, ovulation occurred spontaneously at 5 °C, but was inhibited at 10 °C. A transition from 10 to 5 °C soon resulted in suppression of the inhibition. At 5 °C, the effectiveness of sGnRHa was similar to that of sGnRHa combined with pimozide in stimulating LH secretion and inducing ovulation. At 10 °C, sGnRHa + pimozide was more effective that sGnRHa alone in stimulating LH secretion and inducing a high rate of ovulation, suggesting that dopamine-induced inhibition of LH secretion could occur naturally in Arctic charr at 10 °C. Exposure of Arctic charr to a long day (LD) photoperiod regime in fall and winter did not completely inhibit ovulation, but markedly delayed it and prolonged the ensuing ovulation period. The LD photoperiod also reduced LH plasma levels in females while they were ovulating, but did not modify the responsiveness of the pituitary to GnRHa stimulation compared to a control group exposed to a short-day (SD) photoperiod. There was an interval of several weeks after a transition from LD to SD before LH secretion and ovulation were stimulated. |
author2 |
Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL) Institut National de la Recherche Agronomique (INRA)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry ) Station commune de Recherches en Ichtyophysiologie, Biodiversité et Environnement (SCRIBE) Institut National de la Recherche Agronomique (INRA) |
format |
Article in Journal/Newspaper |
author |
Gillet, Christian, Breton, Bernard |
author_facet |
Gillet, Christian, Breton, Bernard |
author_sort |
Gillet, Christian, |
title |
LH secretion and ovulation following exposure of Arctic charr to different temperature and photoperiod regimes : Responsiveness of females to a gonadotropin releasing hormone analogue and a dopamine antagonist |
title_short |
LH secretion and ovulation following exposure of Arctic charr to different temperature and photoperiod regimes : Responsiveness of females to a gonadotropin releasing hormone analogue and a dopamine antagonist |
title_full |
LH secretion and ovulation following exposure of Arctic charr to different temperature and photoperiod regimes : Responsiveness of females to a gonadotropin releasing hormone analogue and a dopamine antagonist |
title_fullStr |
LH secretion and ovulation following exposure of Arctic charr to different temperature and photoperiod regimes : Responsiveness of females to a gonadotropin releasing hormone analogue and a dopamine antagonist |
title_full_unstemmed |
LH secretion and ovulation following exposure of Arctic charr to different temperature and photoperiod regimes : Responsiveness of females to a gonadotropin releasing hormone analogue and a dopamine antagonist |
title_sort |
lh secretion and ovulation following exposure of arctic charr to different temperature and photoperiod regimes : responsiveness of females to a gonadotropin releasing hormone analogue and a dopamine antagonist |
publisher |
HAL CCSD |
publishDate |
2009 |
url |
https://hal.inrae.fr/hal-02661344 https://doi.org/10.1016/j.ygcen.2009.03.005 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic charr Arctic Human health |
genre_facet |
Arctic charr Arctic Human health |
op_source |
ISSN: 0016-6480 EISSN: 1095-6840 General and Comparative Endocrinology https://hal.inrae.fr/hal-02661344 General and Comparative Endocrinology, Elsevier, 2009, 162 (2), pp.210-218. ⟨10.1016/j.ygcen.2009.03.005⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.ygcen.2009.03.005 hal-02661344 https://hal.inrae.fr/hal-02661344 doi:10.1016/j.ygcen.2009.03.005 PRODINRA: 32230 WOS: 000266320800012 |
op_doi |
https://doi.org/10.1016/j.ygcen.2009.03.005 |
container_title |
General and Comparative Endocrinology |
container_volume |
162 |
container_issue |
2 |
container_start_page |
210 |
op_container_end_page |
218 |
_version_ |
1766303889326342144 |