Abstract
Suppression of 11-hydroxycorticosteroids (11-OHCS) release with dexamethasone (0.5 mg) has been investigated in 52 patients with endogenous depression and also in normals and in patients with other mental diseases. The suppression was considerably less in depressives (-19 +/- 5%) than in control groups (approx. -60%). The dexamethasone test indices were normalized during remission. The elucidate mechanisms of the dexamethasone inhibiting effect, the influence of tryptophan, DOPA and benzodiazepines on the 11-OHCS level and the degree of its suppression with dexamethasone have been studied. The data indicate a dual effect of serotonin on the regulation of the adrenal function: it stimulates CRF secretion and increases the inhibiting effect of corticosteroids on CRF release. It is suggested that during depression the negative feedback is disturbed in the system - brain monoamines-glucocorticoids. The possible role of this impairment in depression pathogenesis is considered.
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