Plasma-binding globulins and acute stress response. |
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Authors: | C W Breuner S E Lynn G E Julian J M Cornelius B J Heidinger O P Love R S Sprague H Wada B A Whitman |
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Institution: | Integrative Biology, University of Texas at Austin, USA. creagh@montana.edu |
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Abstract: | Within studies of acute stress physiology an increase in glucocorticoid secretion is thought to be the primary mediator of tissue response to stress. Corticosteroid-binding globulin may regulate tissue availability of steroids, but has not been considered a dynamic component of the acute stress response. Here, we examined CBG level over the common 60-minute time frame in an acute capture and handling protocol to investigate whether CBG capacity is dynamic or static over short stressors. Using a comparative approach, we measured CBG response to capture and handling stress in nine species of birds, representing five orders and nine families. CBG capacity significantly declined within 30 - 60 minutes of capture in five of the nine species examined. This decline may serve to significantly increase the level of corticosterone reaching tissues during acute stress. |
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