[Biochemical research in depression (author's transl)].

Area of Science:

• Neuroendocrinology
• Biochemical Psychiatry
• Depression Research

Background:

• Previous biochemical depression research focused on biogenic amine metabolism, including the noradrenaline and serotonin hypotheses.
• These hypotheses postulated dysregulation in noradrenaline or serotonin at the receptor level in depression.
• Experimental results for biogenic amine and electrolytic changes in depression have been inconclusive.

Purpose of the Study:

• To explore disturbances in biogenic amine metabolism in the brain as a cause of depression.
• To investigate neuroendocrine markers associated with depression.
• To evaluate the diagnostic and etiological relevance of neuroendocrine dysregulations in depressive disorders.

Main Methods:

• Assessment of cortisol secretion patterns in endogenous depressive patients.
• Dexamethasone suppression test to evaluate cortisol suppression.
• Measurement of growth hormone secretion following insulin-induced hypoglycemia.
• Evaluation of thyrotropin secretion after thyrotropin-releasing hormone administration.

Main Results:

• Increased cortisol secretion was observed in endogenous depressive patients.
• Approximately 65% of patients exhibited blunted cortisol suppression after dexamethasone administration.
• Reduced growth hormone secretion was noted in some menopausal women with depression.
• Thyrotropin secretion was suppressed in 20-40% of endogenous depressive patients post-thyrotropin-releasing hormone injection.

Conclusions:

• Neuroendocrine research provides significant insights into the pathophysiology of depression.
• Altered cortisol secretion and response to dexamethasone are prominent findings in endogenous depression.
• Dysregulation in growth hormone and thyrotropin secretion further supports the role of neuroendocrine factors in depression.