Seasonal variations in plasma cortisol, testosterone, progesterone and leukocyte profiles in a wild population of tuco-tucos

Studies addressing seasonal changes in hormone levels are important in order to understand the interplays between ecology and physiology. In this study, we evaluated seasonal variations in cortisol, testosterone, and progesterone plasma levels in males and females of the subterranean rodent Ctenomys...

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Detalles Bibliográficos
Autores principales: Vera, F., Zenuto, R.R., Antenucci, C.D.
Formato: JOUR
Lenguaje:English
Materias:
Cortisol
Free-living
HPA axis
Progesterone
Seasonal variation
Testosterone
developmental biology
hormone
physiological response
plasma
reproduction
rodent
seasonal variation
wild population
Animalia
Ctenomyidae
Ctenomys talarum
Mammalia
Rodentia
Acceso en línea:http://hdl.handle.net/20.500.12110/paper_09528369_v289_n2_p111_Vera
Aporte de:
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id todo:paper_09528369_v289_n2_p111_Vera
record_format dspace
spelling todo:paper_09528369_v289_n2_p111_Vera2023-10-03T15:50:48Z Seasonal variations in plasma cortisol, testosterone, progesterone and leukocyte profiles in a wild population of tuco-tucos Vera, F. Zenuto, R.R. Antenucci, C.D. Cortisol Free-living HPA axis Progesterone Seasonal variation Testosterone developmental biology hormone physiological response plasma reproduction rodent seasonal variation wild population Animalia Ctenomyidae Ctenomys talarum Mammalia Rodentia Studies addressing seasonal changes in hormone levels are important in order to understand the interplays between ecology and physiology. In this study, we evaluated seasonal variations in cortisol, testosterone, and progesterone plasma levels in males and females of the subterranean rodent Ctenomys talarum. For the case of females, we also aimed to evaluate their capacity to increase their plasma cortisol concentrations in response to capture and restraint during reproductive and non-reproductive seasons. In addition, we registered concomitant seasonal variations in the neutrophil to lymphocyte ratio (N:L) aimed to discriminate between basal and stress-induced seasonal changes in cortisol levels in both males and females. Both basal and stressed-induced cortisol levels were significantly higher in reproductive than non-reproductive females. For the case of males, cortisol levels were also higher during the reproductive season, though values were two- to threefold lower than in females. The N:L ratios attained low values, typical of unstressed animals, in both males and females, indicating that the animals were not facing acute or chronic stressors at the moment of their capture. Testosterone levels in males were significantly elevated in relation to other mammals reaching up to 486ngmL-1, with significantly higher levels during the reproductive season (mean: 209.45 ± 177.76ngmL-1) and a remarkable inter-individual variation. On the other hand, progesterone levels in females captured during reproductive and non-reproductive seasons were not significantly different. This study shows that seasonal modulation in testosterone and also in baseline and stress-induced cortisol levels occurs in tuco-tucos associated with reproduction. © 2012 The Zoological Society of London. JOUR English info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_09528369_v289_n2_p111_Vera
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
language English
orig_language_str_mv English
topic Cortisol
Free-living
HPA axis
Progesterone
Seasonal variation
Testosterone
developmental biology
hormone
physiological response
plasma
reproduction
rodent
seasonal variation
wild population
Animalia
Ctenomyidae
Ctenomys talarum
Mammalia
Rodentia
spellingShingle Cortisol
Free-living
HPA axis
Progesterone
Seasonal variation
Testosterone
developmental biology
hormone
physiological response
plasma
reproduction
rodent
seasonal variation
wild population
Animalia
Ctenomyidae
Ctenomys talarum
Mammalia
Rodentia
Vera, F.
Zenuto, R.R.
Antenucci, C.D.
Seasonal variations in plasma cortisol, testosterone, progesterone and leukocyte profiles in a wild population of tuco-tucos
topic_facet Cortisol
Free-living
HPA axis
Progesterone
Seasonal variation
Testosterone
developmental biology
hormone
physiological response
plasma
reproduction
rodent
seasonal variation
wild population
Animalia
Ctenomyidae
Ctenomys talarum
Mammalia
Rodentia
description Studies addressing seasonal changes in hormone levels are important in order to understand the interplays between ecology and physiology. In this study, we evaluated seasonal variations in cortisol, testosterone, and progesterone plasma levels in males and females of the subterranean rodent Ctenomys talarum. For the case of females, we also aimed to evaluate their capacity to increase their plasma cortisol concentrations in response to capture and restraint during reproductive and non-reproductive seasons. In addition, we registered concomitant seasonal variations in the neutrophil to lymphocyte ratio (N:L) aimed to discriminate between basal and stress-induced seasonal changes in cortisol levels in both males and females. Both basal and stressed-induced cortisol levels were significantly higher in reproductive than non-reproductive females. For the case of males, cortisol levels were also higher during the reproductive season, though values were two- to threefold lower than in females. The N:L ratios attained low values, typical of unstressed animals, in both males and females, indicating that the animals were not facing acute or chronic stressors at the moment of their capture. Testosterone levels in males were significantly elevated in relation to other mammals reaching up to 486ngmL-1, with significantly higher levels during the reproductive season (mean: 209.45 ± 177.76ngmL-1) and a remarkable inter-individual variation. On the other hand, progesterone levels in females captured during reproductive and non-reproductive seasons were not significantly different. This study shows that seasonal modulation in testosterone and also in baseline and stress-induced cortisol levels occurs in tuco-tucos associated with reproduction. © 2012 The Zoological Society of London.
format JOUR
author Vera, F.
Zenuto, R.R.
Antenucci, C.D.
author_facet Vera, F.
Zenuto, R.R.
Antenucci, C.D.
author_sort Vera, F.
title Seasonal variations in plasma cortisol, testosterone, progesterone and leukocyte profiles in a wild population of tuco-tucos
title_short Seasonal variations in plasma cortisol, testosterone, progesterone and leukocyte profiles in a wild population of tuco-tucos
title_full Seasonal variations in plasma cortisol, testosterone, progesterone and leukocyte profiles in a wild population of tuco-tucos
title_fullStr Seasonal variations in plasma cortisol, testosterone, progesterone and leukocyte profiles in a wild population of tuco-tucos
title_full_unstemmed Seasonal variations in plasma cortisol, testosterone, progesterone and leukocyte profiles in a wild population of tuco-tucos
title_sort seasonal variations in plasma cortisol, testosterone, progesterone and leukocyte profiles in a wild population of tuco-tucos
url http://hdl.handle.net/20.500.12110/paper_09528369_v289_n2_p111_Vera
work_keys_str_mv AT veraf seasonalvariationsinplasmacortisoltestosteroneprogesteroneandleukocyteprofilesinawildpopulationoftucotucos
AT zenutorr seasonalvariationsinplasmacortisoltestosteroneprogesteroneandleukocyteprofilesinawildpopulationoftucotucos
AT antenuccicd seasonalvariationsinplasmacortisoltestosteroneprogesteroneandleukocyteprofilesinawildpopulationoftucotucos
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