Effect of elevated temperature on estrogenic induction of vitellogenesis and zonagenesis in juvenile Atlantic salmon (Salmo salar)

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Author(s)
Anderson, Kelli
King, Harry
Pankhurst, Ned
Ruff, Nicole
Pankhurst, Patricia
Elizur, Abigail
Year published
2012
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Fertility and embryo survival rates are often low in eggs from thermally challenged Tasmanian Atlantic salmon, partly due to a reduction in plasma 17߭estradiol (E2) levels. We used juvenile Atlantic salmon to assess whether hepatic tissue remains responsive to stimulation by E2 at the higher temperatures sometimes encountered by Tasmanian salmon during summer. E2 administration stimulated vitellogenin (Vtg) and estrogen receptor alpha transcription at 14àand 22ì although induction of Vtg occurred more rapidly at 22î Consequently, plasma Vtg levels increased and reached a plateau more quickly at 22î Zona pellucida (Zp) B and ...
View more >Fertility and embryo survival rates are often low in eggs from thermally challenged Tasmanian Atlantic salmon, partly due to a reduction in plasma 17߭estradiol (E2) levels. We used juvenile Atlantic salmon to assess whether hepatic tissue remains responsive to stimulation by E2 at the higher temperatures sometimes encountered by Tasmanian salmon during summer. E2 administration stimulated vitellogenin (Vtg) and estrogen receptor alpha transcription at 14àand 22ì although induction of Vtg occurred more rapidly at 22î Consequently, plasma Vtg levels increased and reached a plateau more quickly at 22î Zona pellucida (Zp) B and C transcription was significantly lower in E2-treated fish at 22àrelative to 14î This shows that the Vtg gene is E2-responsive at high temperature unlike Zp B and C genes that displayed traits of thermal inhibition. Therefore, estrogen replacement therapy in adult salmon may offset some, but not all thermal inhibition of reproductive function.
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View more >Fertility and embryo survival rates are often low in eggs from thermally challenged Tasmanian Atlantic salmon, partly due to a reduction in plasma 17߭estradiol (E2) levels. We used juvenile Atlantic salmon to assess whether hepatic tissue remains responsive to stimulation by E2 at the higher temperatures sometimes encountered by Tasmanian salmon during summer. E2 administration stimulated vitellogenin (Vtg) and estrogen receptor alpha transcription at 14àand 22ì although induction of Vtg occurred more rapidly at 22î Consequently, plasma Vtg levels increased and reached a plateau more quickly at 22î Zona pellucida (Zp) B and C transcription was significantly lower in E2-treated fish at 22àrelative to 14î This shows that the Vtg gene is E2-responsive at high temperature unlike Zp B and C genes that displayed traits of thermal inhibition. Therefore, estrogen replacement therapy in adult salmon may offset some, but not all thermal inhibition of reproductive function.
View less >
Journal Title
Marine and Freshwater Behaviour and Physiology
Volume
45
Issue
1
Copyright Statement
© 2012 Taylor & Francis. This is an electronic version of an article published in Marine and Freshwater Behaviour and Physiology, Volume 45, Issue 1, 2012, Pages 1-15. Marine and Freshwater Behaviour and Physiology is available online at: http://www.informaworld.com with the open URL of your article.
Subject
Biological sciences
Ecological physiology