Elevated plasma corticosterone increases metabolic rate in a terrestrial salamander
| Autor: | Sarah E. DuRant, Corina L. Wack, Richard C. Feldhoff, Matthew B. Lovern, Sarah K. Woodley, William A. Hopkins |
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| Rok vydání: | 2012 |
| Předmět: |
Male
Amphibian endocrine system medicine.medical_specialty Physiology media_common.quotation_subject Urodela Biology Biochemistry Pheromones Courtship chemistry.chemical_compound Oxygen Consumption Corticosterone biology.animal Internal medicine Respiration polycyclic compounds medicine Animals Molecular Biology media_common Body Weight Metabolism Endocrinology chemistry Sex pheromone Basal metabolic rate Pheromone Basal Metabolism hormones hormone substitutes and hormone antagonists |
| Zdroj: | Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology. 161:153-158 |
| ISSN: | 1095-6433 |
| DOI: | 10.1016/j.cbpa.2011.10.017 |
| Popis: | article i nfo Plasma glucocorticoid hormones (GCs) increase intermediary metabolism, which may be reflected in whole- animal metabolic rate. Studies in fish, birds, and reptiles have shown that GCs may alter whole-animal energy expenditure, but results are conflicting and often involve GC levels that are not physiologically relevant. A previ- ous study in red-legged salamanders found that male courtship pheromone increased plasma corticosterone (CORT; the primary GC in amphibians) concentrations in males, which could elevate metabolic processes to sus- taincourtship behaviors. To understand the possible metabolic effect of elevated plasma CORT, we measured the effects of male courtship pheromone and exogenous application of CORT on oxygen consumption in male red- legged salamanders (Plethodon shermani). Exogenous application of CORT elevated plasma CORT to physiologi- cally relevant levels. Compared to treatment with male courtship pheromone and vehicle, treatment with CORT increased oxygen consumption rates for several hours after treatment, resulting in 12% more oxygen con- sumed (equivalent to 0.33 J) during our first 2 h sampling period.Contrary to our previous work, treatment with pheromone didnotincreaseplasmaCORT,perhaps because subjects usedinthisstudy werenotinbreeding con- dition. Pheromone application did not affect respiration rates. Our study is one of the few to evaluate the influ- ence of physiologically relevant elevations in CORT on whole-animal metabolism in vertebrates, and the first to show that elevated plasma CORT increases metabolism in an amphibian. |
| Databáze: | OpenAIRE |
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