Abstract

AbstractAdult male rats were treated daily with scopolamine (10 mg/kg) for two weeks and the ACTH response to acute physostigmine (0.1 mg/kg) challenge was evaluated. Although physostigmine produced a significant increase in A CTH concentrations in all animals, repeated scopolamine administration did not alter basal ACTH concentrations or the ACTH response to physostigmine. The results are discussed in relation to dysregulation of the hypothalamic‐pituitary adrenal (HPA) axis and rapid eye movement (REM) sleep in depression, as mediated by differential adaptive responses of central cholinergic systems. Depression 1:101–104 (1993). © 1993 Wiley‐Liss, Inc.

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