NDLI: The effect of acute stress and long-term corticosteroid administration on plasma metabolites in an urban and desert songbird.

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The effect of acute stress and long-term corticosteroid administration on plasma metabolites in an urban and desert songbird.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Davies, Scott Rodriguez, Natalie S. Sweazea, Karen L. Deviche, Pierre
Spatial Coverage	Arizona
Description	Country affiliation: United States Author Affiliation: Davies S ( School of Life Sciences, Arizona State University, Tempe, AZ 85287, USA. scott.davies@asu.edu)
Abstract	In response to stressful stimuli, animals activate the hypothalamic-pituitary-adrenal axis, which can result in transition to the 'emergency life history stage.' A key adaptive characteristic of this life history stage is the mobilization of energy stores. However, few data are available on the metabolic response to acute stress in wild-caught, free-ranging birds. We quantified the effect of acute capture and restraint stress on plasma glucose, free fatty acid, and uric acid in free-ranging Abert's towhees Melozone aberti. Furthermore, birds were caught from urban and desert localities of Phoenix, Arizona, to investigate potential effects of urban versus desert habitats on the corticosterone (CORT) and metabolic response to acute stress. Complementing work on free-ranging birds, captive towhees received CORT-filled Silastic capsules to investigate the response of urban and desert conspecifics to long-term CORT administration. We quantified the effect of CORT administration on baseline plasma glucose and uric acid, liver and pectoralis muscle glycogen stores, kidney phosphoenolpyruvate carboxykinase (PEPCK-C, a key gluconeogenic enzyme), and body mass. Acute stress increased plasma CORT and glucose and decreased plasma uric acid but had no effect on plasma free fatty acid. There was no difference between urban and desert localities in body mass, fat scores, and the response to acute stress. CORT administration decreased body mass but had no effect on glucose and uric acid, pectoral muscle glycogen, or kidney PEPCK-C. However, liver glycogen of CORT-treated urban birds increased compared with corresponding controls, whereas glycogen decreased in CORT-treated desert birds. This study suggests that Abert's towhees principally mobilize glucose during acute stress but urban and desert towhees do not differ in their CORT and metabolic response to acute stress or long-term CORT administration.
File Format	HTM / HTML
ISSN	15222152
Issue Number	1
Volume Number	86
e-ISSN	15375293
Journal	Physiological and Biochemical Zoology
Language	English
Publisher	University of Chicago Press
Publisher Date	2013-01-01
Publisher Place	United States
Access Restriction	Subscribed
Subject Keyword	Discipline Physiology Discipline Biochemistry Discipline Zoology Adrenal Cortex Hormones Administration & Dosage Blood Glucose Metabolism Fatty Acids, Nonesterified Blood Glycogen Songbirds Physiology Uric Acid Animals Arizona Desert Climate Environment Liver Male Pectoralis Muscles Random Allocation Stress, Physiological Journal Article Research Support, Non-u.s. Gov't Research Support, U.s. Gov't, Non-p.h.s.
Content Type	Text
Resource Type	Article
Subject	Physiology Biochemistry Animal Science and Zoology

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