Acute physiological stress down-regulates mRNA expressions of growth-related genes in Coho salmon

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DOIResolve DOI: http://doi.org/10.1371/journal.pone.0071421
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EditorSearch for: Fuentes, Juan
TypeArticle
Journal titlePLoS ONE
ISSN1932-6203
Volume8
Issue8
Article numbere71421
Pages17
SubjectFish physiology; Salmon; Gene expression; Hydrocortisone; Marine fish; Pituitary gland; Growth hormone; Blood plasma
AbstractGrowth and development in fish are regulated to a major extent by growth-related factors, such as liver-derived insulin-like growth factor (IGF) -1 in response to pituitary-secreted growth hormone (GH) binding to the GH receptor (GHR). Here, we report on the changes in the expressions of gh, ghr, and igf1 genes and the circulating levels of GH and IGF-1 proteins in juvenile coho salmon (Oncorhynchus kisutch) in response to handling as an acute physiological stressor. Plasma GH levels were not significantly different between stressed fish and prestressed control. Plasma IGF-1 concentrations in stressed fish 1.5 h post-stress were the same as in control fish, but levels in stressed fish decreased significantly 16 h post-stress. Real-time quantitative PCR (qPCR) analysis showed that ghr mRNA levels in pituitary, liver, and muscle decreased gradually in response to the stressor. After exposure to stress, hepatic igf1 expression transiently increased, whereas levels decreased 16 h post-stress. On the other hand, the pituitary gh mRNA level did not change in response to the stressor. These observations indicate that expression of gh, ghr, and igf1 responded differently to stress. Our results show that acute physiological stress can mainly down-regulate the expressions of growth-related genes in coho salmon in vivo. This study also suggests that a relationship between the neuroendocrine stress response and growth-related factors exists in fish.
Publication date
PublisherPLOS
LanguageEnglish
AffiliationNRC Institute for Marine Biosciences; National Research Council Canada
Peer reviewedYes
NPARC number23000449
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Record identifierc01f1aaf-d29d-48ff-b8d5-42aad7b01964
Record created2016-07-19
Record modified2016-07-19
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