Elevated plasma corticosterone increases metabolic rate in a terrestrial salamander

Wack, Corina L.; DuRant, Sarah E.; Hopkins, William A.; Lovern, Matthew B.; Feldhoff, Richard C.; Woodley, Sarah K.

doi:10.1016/j.cbpa.2011.10.017

Cited by 73 publications

(40 citation statements)

References 54 publications

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“…GC-receptor activation could result in lower upregulation of genes and proteins necessary for increases in Na þ absorption in the kidneys and urinary bladder, which are necessary to maintain osmotic balance [29,30]. In addition, acute experimental elevation of corticosterone in ectothermic vertebrates can cause increased metabolism [44,45], suggesting another mechanism that could increase evaporative water loss in cane toads. However, from our results, we cannot specifically identify how corticosterone affects the many potential regulatory processes (i.e.…”

Section: Discussionmentioning

confidence: 99%

Adrenocortical stress responses influence an invasive vertebrate's fitness in an extreme environment

et al. 2013

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Continued range expansion into physiologically challenging environments requires invasive species to maintain adaptive phenotypic performance. The adrenocortical stress response, governed in part by glucocorticoid hormones, influences physiological and behavioural responses of vertebrates to environmental stressors. However, any adaptive role of this response in invasive populations that are expanding into extreme environments is currently unclear. We experimentally manipulated the adrenocortical stress response of invasive cane toads (Rhinella marina) to investigate its effect on phenotypic performance and fitness at the species' range front in the Tanami Desert, Australia. Here, toads are vulnerable to overheating and dehydration during the annual hot -dry season and display elevated plasma corticosterone levels indicative of severe environmental stress. By comparing unmanipulated control toads with toads whose adrenocortical stress response was manipulated to increase acute physiological stress responsiveness, we found that control toads had significantly reduced daily evaporative water loss and higher survival relative to the experimental animals. The adrenocortical stress response hence appears essential in facilitating complex phenotypic performance and setting fitness trajectories of individuals from invasive species during range expansion.

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Section: Discussionmentioning

confidence: 99%

Adrenocortical stress responses influence an invasive vertebrate's fitness in an extreme environment

et al. 2013

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“…The relationship between CORT and energy metabolism is more complicated and the results are conflicting. Buttemer et al (1991) suggested that corticosterone has no effect on basal metabolic rate in birds while elevated plasma corticosterone increased the rate in a terrestrial salamander (Wack et al 2012). We also statistically analysed the relationship between stress-induced CORT release and the lipid concentration as well as other hormonal changes using Pearson correlation analysis.…”

Section: Discussionmentioning

confidence: 99%

Acute stress-induced changes in hormone and lipid levels in mouse plasma

Ahn¹,

Bae²,

Yun³

2016

Vet. Med.

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ABSTRACT:We evaluated the conventional acute stress model in mice and investigated the stress-induced changes in concentrations of plasma lipids and hormones such as corticosterone (CORT), insulin, glucagon, triiodothyronine (T 3 ), and thyroxine (T 4 ). Stress induction for 120 min using tape-immobilisation and restraint resulted in an increase in the plasma levels of CORT, insulin, glucose, total cholesterol (TC), and low density lipoprotein-cholesterol compared with unstressed mice. Stress also resulted in a decrease in the concentrations of T 3 , T 4 , triglycerides (TG), and high density lipoprotein-cholesterol. However, the amount of glucagon did not change. Moreover, the concentrations of T 3 , T 4 , TC, TG, and lipoprotein cholesterol were maintained at constant levels over the recovery periods after stress induction; however, CORT, glucose, and insulin concentrations decreased as a function of time. Statistical correlations between the parameters that changed in response to acute stress were also investigated. In contrast, stress induction for 30 or 60 min did not cause substantial changes in the lipid profiles, although there were fluctuations in the levels of some hormones. This study thus introduces an appropriate model for the study of the acute stress response of lipids and hormones and our data suggest that acute stress affects the levels of plasma lipids, especially cholesterol, in mice.

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“…Our results also show a negative relationship between SMR and CORT in R. jimi. The relation between CORT plasma levels and SMR has been controversial in the literature (Wikelski et al, 1999;Preest and Cree, 2008;Miles et al 2007;Wack et al 2012), although experimentally increased CORT plasma levels decreased SMR of both side-blotched lizards (Uta stansburiana) (Miles et al, 2007) and Coho salmon (Davis and Schreck, 1977). Although these results have been interpreted as adaptive because it might enhance survival during stressful episodes by minimizing energetic costs (Miles et al, 2007), the mechanisms involved on this relationship remain to be studied.…”

Section: Discussionmentioning

confidence: 99%

“…We also expected immune response to be more prominent during reproductive period and positively correlated to steroid plasma levels, when compared to dry season. Although, the effects of elevation of T and CORT plasma levels in SMR have been controversial in the literature (Buttemer and Astheimer, 2000;Wack et al 2012 for reviews), we expected steroid plasma levels to be positively correlated to standard metabolic rate and metabolic cost to immunological challenge. To test these hypotheses, we assessed steroid plasma levels (CORT and T-DHT), immune parameters (bacterial killing ability, edema response to …”

Section: )mentioning

confidence: 97%

“…Higher T and CORT plasma levels have been shown to increase (Buchanan et al 2001;DuRant et al 2008;Preest and Cree, 2008;Wack et al 2012), decreased (Wikelski et al 1999;Miles et al 2007) or display no effects on standard metabolic rates (SMR) (Wikelski et al 1999;Buttemer and Astheimer, 2000). Otherwise,, many studies have shown that immunological challenges increase rates of oxygen consumption (Ots et al 2001;Martin et al 2003).…”

Section: )mentioning

confidence: 99%

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Relação sazonal entre reprodução, energética e imunocompetência em sapos da Caatinga

Madelaire¹

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Elevated plasma corticosterone increases metabolic rate in a terrestrial salamander

Cited by 73 publications

References 54 publications

Adrenocortical stress responses influence an invasive vertebrate's fitness in an extreme environment

Adrenocortical stress responses influence an invasive vertebrate's fitness in an extreme environment

Acute stress-induced changes in hormone and lipid levels in mouse plasma

Relação sazonal entre reprodução, energética e imunocompetência em sapos da Caatinga

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