Dynamic variations in plasma corticosteroid-binding globulin and basal HPA activity following acute stress in adult rats

被引:60
作者
Tannenbaum, B
Rowe, W
Sharma, S
Diorio, J
Steverman, A
Walker, M
Meaney, MJ
机构
[1] MCGILL UNIV, RES CTR,DEV NEUROENDOCRINOL LAB, DEPT PSYCHIAT & NEUROL,DOUGLAS HOSP, MONTREAL, PQ H4H 1R3, CANADA
[2] MCGILL UNIV, DEPT NEUROSURG, MONTREAL, PQ H4H 1R3, CANADA
关键词
corticosteroid-binding globulin (CBG); stress; glucocorticoids; rats; pituitary transcortin;
D O I
10.1046/j.1365-2826.1997.t01-1-00550.x
中图分类号
R5 [内科学];
学科分类号
1002 ; 100201 ;
摘要
We report on dynamic changes in plasma corticosteroid-binding globulin (CBG) binding and basal hypothalamic-pituitary-adrenal (HPA) activity following acute stress in adult rats. Plasma CBG binding was significantly reduced at 24 and 48 h following a single 60 min period of restraint. Basal levels of plasma ACTH and total corticosterone (B) during the light phase of the cycle were elevated at 24 h following restraint. These effects occurred only when animals were stressed in the light phase of the cycle; animals exposed to restraint stress during the dark phase of the cycle showed no change in plasma CBG binding or in basal HPA activity. Pituitary intracellular transcortin, which is derived from circulating CBG, was also decreased by restaint stress. The decrease in CBG binding was also associated with a significant increase in resting-state free B levels. Together, these effects produced a substantially (i.e. similar to 10-fold) increased 'basal' glucocorticoid signal 24 h following acute stress. These data suggest that the increase in the circulating glucocorticoid signal associated with acute stress endures well beyond the period of increased total B levels.
引用
收藏
页码:163 / 168
页数:6
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