Changes in Transcript Levels of Gill Cortisol Receptor during Smoltification in Wild Masu Salmon, Oncorhynchus masou

Mizuno, Shinya; Ura, Kiyoe; Onodera, Yoshifumi; Fukada, Haruhisa; Misaka, Naoyuki; Hara, Akihiko; Adachi, Souichi; Yamauchi, Kazuyo

doi:10.2108/zsj.18.853

Cited by 28 publications

(11 citation statements)

References 37 publications

(41 reference statements)

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“…Taken together with an up-regulation of GR2 mRNA level during SW-FW transfer in this study, it is impossible to reach any conclusion on GR2 function at this point. The downregulation of GR1 presented in this study is in contrast to the FW-SW acclimatory role of GR1 suggested by the up-regulation of GR1 in gill during FW-SW acclimation in Atlantic salmon (Kiilerich et al 2007b, Nilsen et al 2008 and during the preparatory development of SW tolerance, smoltification (Mazurais et al 1998, Mizuno et al 2001, Kiilerich et al 2007b. Interestingly, the up-regulation of GR1 transcript level in the gill after SW-FW transfer presented in this study suggests a role for GR1 in FW-acclimation.…”

Section: Differential Functions Of the Gr Isoforms In Trout Osmoregulcontrasting

confidence: 76%

Implication of the mineralocorticoid axis in rainbow trout osmoregulation during salinity acclimation

Kiilerich¹,

Milla²,

Sturm³

et al. 2011

Journal of Endocrinology

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Cortisol and glucocorticoid receptors (GRs) play an important role in fish osmoregulation, whereas the involvement of the mineralocorticoid receptor (MR) and its putative ligand 11-deoxycorticosterone (DOC) is poorly investigated. In this study, we assessed the implication of DOC and MR in rainbow trout (Oncorhynchus mykiss) osmoregulation during hypo-and hypersaline acclimation in parallel with the cortisol-GR system. A RIA for DOC was developed to measure plasma DOC levels, and a MR-specific antibody was developed to localize MR protein in the gill, intestine, and kidney. This is the first study to report DOC plasma levels during salinity change and MR localization in fish osmoregulatory tissue. Corticosteroid receptor mRNA abundance was investigated in osmoregulatory tissue during salinity acclimation, and the effect of cortisol and DOC on ionic transporters gene expression was assayed using an in vitro gill incubation method. Differential tissue-, salinity-, and time-dependent changes in MR mRNA levels during both hyper-and hyposaline acclimations and the ubiquitous localization of MR in osmoregulatory tissue suggest a role for the MR in osmoregulation. Presumably, DOC does not act as ligand for MR in osmoregulation because there were no changes in plasma DOC levels during either freshwaterseawater (FW-SW) or SW-FW acclimation or any effect of DOC on gill ionic transporter mRNA levels in the gill. Taken together, these results suggest a role for MR, but not for DOC, in osmoregulation and confirm the importance of cortisol as a major endocrine regulator of trout osmoregulation.

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Section: Differential Functions Of the Gr Isoforms In Trout Osmoregulcontrasting

confidence: 76%

Implication of the mineralocorticoid axis in rainbow trout osmoregulation during salinity acclimation

Kiilerich¹,

Milla²,

Sturm³

et al. 2011

Journal of Endocrinology

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“…In anadromous salmon, circulating GH and cortisol usually show an increase during spring smoltification (30). The present study demonstrated that gill GH receptor mRNA levels could respond to exogenous hormonal signals in Biwa salmon, especially cortisol.…”

Section: Discussionsupporting

confidence: 53%

Lack of hormonal stimulation prevents the landlocked Biwa salmon (Oncorhynchus masousubspecies) from adapting to seawater

Nakajima

Shimura

Yamazaki

et al. 2014

American Journal of Physiology-Regulatory, Integrative and Comp

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“…The plasma cortisol levels of migrants in the cortisol 2 mg/ fish-treated 1+ smolts (Fig. 22) were similar to those levels of naturally occurring 1+ smolts (Nagae et al 1994;Mizuno et al 2001).…”

Section: -2a Cortisolsupporting

confidence: 57%

“…Plasma levels of cortisol and GH continually increase during the period of downstream migration Nagae et al 1994;McCormick 2001;Mizuno et al 2001;Zydlewski et al 2005). The involvement of cortisol and ovine GH (oGH) treatment on the occurrence of downstream swimming behavior in 1+ and 0+ masu salmon juveniles will be summarized in the following sections.…”

Section: Roles Of Thyroid Hormones Cortisol Growth Hormone and Envmentioning

confidence: 99%

Migratory Behaviors in Masu Salmon (Oncorhynchus masou) and the Influence of Endocrinological Factors

Munakata¹

2012

Aqua-BioSci. Monogr. (ABSM)

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Changes in Transcript Levels of Gill Cortisol Receptor during Smoltification in Wild Masu Salmon, Oncorhynchus masou

Cited by 28 publications

References 37 publications

Implication of the mineralocorticoid axis in rainbow trout osmoregulation during salinity acclimation

Implication of the mineralocorticoid axis in rainbow trout osmoregulation during salinity acclimation

Lack of hormonal stimulation prevents the landlocked Biwa salmon (Oncorhynchus masousubspecies) from adapting to seawater

Migratory Behaviors in Masu Salmon (Oncorhynchus masou) and the Influence of Endocrinological Factors

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