Migratory state is not associated with differences in neural glucocorticoid or mineralocorticoid receptor expression in pine siskins

Although the endocrine system likely plays an important role in orchestrating the transition to a migratory state, the specific mechanisms by which this occurs remain poorly understood. Changes in glucocorticoid signaling are one proposed mechanism that may be important in migratory transitions. Alt...

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Autores principales:	Watts Heather E., Rittenhouse Jeffrey L., Sewall Kendra B., Bowers J. Michael
Formato:	article
Lenguaje:	EN
Publicado:	De Gruyter 2019
Materias:	avian birds corticosterone migration physiology Biology (General) QH301-705.5
Acceso en línea:	https://doaj.org/article/033d541b152540cc9c6a64bcab5154a8
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spelling	oai:doaj.org-article:033d541b152540cc9c6a64bcab5154a82021-12-02T19:11:09ZMigratory state is not associated with differences in neural glucocorticoid or mineralocorticoid receptor expression in pine siskins2084-883810.1515/ami-2019-0001https://doaj.org/article/033d541b152540cc9c6a64bcab5154a82019-12-01T00:00:00Zhttps://doi.org/10.1515/ami-2019-0001https://doaj.org/toc/2084-8838Although the endocrine system likely plays an important role in orchestrating the transition to a migratory state, the specific mechanisms by which this occurs remain poorly understood. Changes in glucocorticoid signaling are one proposed mechanism that may be important in migratory transitions. Although previous work has focused on the role of changes in circulating glucocorticoids, another potential mechanism is changes in the expression of its cognate receptors. Here, we test this hypothesis by comparing mRNA expression of the genes for the mineralocorticoid receptor (MR) and glucocorticoid receptor (GR) in two brain regions implicated in the regulation of migratory behavior (the hippocampus and hypothalamus) in pine siskins (Spinus pinus) sampled before or after the transition to a spring nomadic migratory state. Compared to pre-migratory birds, migratory birds had body conditions more indicative of physiological preparations for migration (e.g., larger body mass), and greater levels of nocturnal migratory restlessness. However, we found no differences between pre-migratory and migratory birds in the expression of GR or MR mRNA in either the hippocampus or hypothalamus. Thus, differences in expression of receptors for glucocorticoids do not appear to underly the observed differences in physiology and behavior across a migratory transition. Taken together with previous results showing no change in circulating corticosterone levels during this transition, our findings provide no evidence for a role of glucocorticoid signaling in the spring migratory transition of this species.Watts Heather E.Rittenhouse Jeffrey L.Sewall Kendra B.Bowers J. MichaelDe GruyterarticleavianbirdscorticosteronemigrationphysiologyBiology (General)QH301-705.5ENAnimal Migration, Vol 6, Iss 1, Pp 19-27 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	avian birds corticosterone migration physiology Biology (General) QH301-705.5
spellingShingle	avian birds corticosterone migration physiology Biology (General) QH301-705.5 Watts Heather E. Rittenhouse Jeffrey L. Sewall Kendra B. Bowers J. Michael Migratory state is not associated with differences in neural glucocorticoid or mineralocorticoid receptor expression in pine siskins
description	Although the endocrine system likely plays an important role in orchestrating the transition to a migratory state, the specific mechanisms by which this occurs remain poorly understood. Changes in glucocorticoid signaling are one proposed mechanism that may be important in migratory transitions. Although previous work has focused on the role of changes in circulating glucocorticoids, another potential mechanism is changes in the expression of its cognate receptors. Here, we test this hypothesis by comparing mRNA expression of the genes for the mineralocorticoid receptor (MR) and glucocorticoid receptor (GR) in two brain regions implicated in the regulation of migratory behavior (the hippocampus and hypothalamus) in pine siskins (Spinus pinus) sampled before or after the transition to a spring nomadic migratory state. Compared to pre-migratory birds, migratory birds had body conditions more indicative of physiological preparations for migration (e.g., larger body mass), and greater levels of nocturnal migratory restlessness. However, we found no differences between pre-migratory and migratory birds in the expression of GR or MR mRNA in either the hippocampus or hypothalamus. Thus, differences in expression of receptors for glucocorticoids do not appear to underly the observed differences in physiology and behavior across a migratory transition. Taken together with previous results showing no change in circulating corticosterone levels during this transition, our findings provide no evidence for a role of glucocorticoid signaling in the spring migratory transition of this species.
format	article
author	Watts Heather E. Rittenhouse Jeffrey L. Sewall Kendra B. Bowers J. Michael
author_facet	Watts Heather E. Rittenhouse Jeffrey L. Sewall Kendra B. Bowers J. Michael
author_sort	Watts Heather E.
title	Migratory state is not associated with differences in neural glucocorticoid or mineralocorticoid receptor expression in pine siskins
title_short	Migratory state is not associated with differences in neural glucocorticoid or mineralocorticoid receptor expression in pine siskins
title_full	Migratory state is not associated with differences in neural glucocorticoid or mineralocorticoid receptor expression in pine siskins
title_fullStr	Migratory state is not associated with differences in neural glucocorticoid or mineralocorticoid receptor expression in pine siskins
title_full_unstemmed	Migratory state is not associated with differences in neural glucocorticoid or mineralocorticoid receptor expression in pine siskins
title_sort	migratory state is not associated with differences in neural glucocorticoid or mineralocorticoid receptor expression in pine siskins
publisher	De Gruyter
publishDate	2019
url	https://doaj.org/article/033d541b152540cc9c6a64bcab5154a8
work_keys_str_mv	AT wattsheathere migratorystateisnotassociatedwithdifferencesinneuralglucocorticoidormineralocorticoidreceptorexpressioninpinesiskins AT rittenhousejeffreyl migratorystateisnotassociatedwithdifferencesinneuralglucocorticoidormineralocorticoidreceptorexpressioninpinesiskins AT sewallkendrab migratorystateisnotassociatedwithdifferencesinneuralglucocorticoidormineralocorticoidreceptorexpressioninpinesiskins AT bowersjmichael migratorystateisnotassociatedwithdifferencesinneuralglucocorticoidormineralocorticoidreceptorexpressioninpinesiskins
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Migratory state is not associated with differences in neural glucocorticoid or mineralocorticoid receptor expression in pine siskins

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