کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5901693 1568926 2011 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cortisol and corticosterone exhibit different seasonal variation and responses to acute stress and captivity in tuco-tucos (Ctenomys talarum)
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی علوم غدد
پیش نمایش صفحه اول مقاله
Cortisol and corticosterone exhibit different seasonal variation and responses to acute stress and captivity in tuco-tucos (Ctenomys talarum)
چکیده انگلیسی

In this work we aimed to evaluate variations in plasma glucocorticoids (GCs, cortisol and corticosterone) levels throughout an annual cycle in free-living male tuco-tucos (Ctenomys talarum) and compare their responses to acute and chronic stressors (trapping, manipulation, immobilization, confinement in a novel environment, transference to captivity). In addition, we used leukocyte profiles to allow discrimination between basal and stress-induced seasonal changes in GC concentrations. Our results showed that cortisol and corticosterone are differently affected by environmental stimuli in C. talarum. Both hormones showed different patterns of variation in the field and responses to captivity. Moreover, only cortisol was responsive to acute stressors. Leukocyte profiles indicated that animals were unstressed in the field and therefore, that we were able to measure basal, stress-independent, fluctuations in GC levels. GC concentrations were low in comparison to values frequently reported for other mammals. Our results suggest differentiated physiological roles for cortisol and corticosterone in our study species and further emphazise the complexity of GC physiology in wild mammals.

Research highlights► Contrasting responses to acute stress of cortisol and corticosterone. ► Contrasting seasonal variation patterns of cortisol and corticosterone. ► Contrasting responses to captivity of cortisol and corticosterone. ► Use of leukocyte profiles to discriminate between basal and stress-induced variation in GCs.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: General and Comparative Endocrinology - Volume 170, Issue 3, 1 February 2011, Pages 550-557
نویسندگان
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