Stress-Induced Changes in Cerebral Metabolites, Hippocampal Volume, and Cell Proliferation are Prevented by Antidepressant Treatment with Tianeptine

• Published in: Proceedings of the National Academy of Sciences - PNAS Vol. 98; no. 22; pp. 12796 - 12801
• Main Authors: Czéh, Boldizsár, Michaelis, Thomas, Watanabe, Takashi, Frahm, Jens, de Biurrun, Gabriel, van Kampen, Marja, Bartolomucci, Alessandro, Fuchs, Eberhard
• Format: Journal Article
• Language: English
• Published: United States National Academy of Sciences 23.10.2001; National Acad Sciences; The National Academy of Sciences
• Subjects: Animals; Antidepressants; Antidepressive Agents, Tricyclic - therapeutic use; Behavioral neuroscience; Biological Sciences; Biology; Brain; Brain - drug effects; Brain - metabolism; Cell Division - drug effects; Cell growth; Cellular metabolism; Dentate gyrus; Depression - drug therapy; Depression - metabolism; Depression - pathology; Hippocampus; Hippocampus - drug effects; Hippocampus - pathology; Hypothalamo-Hypophyseal System - drug effects; Hypothalamo-Hypophyseal System - physiology; Male; Metabolites; Neurogenesis; Neurology; Neurons; Pituitary-Adrenal System - drug effects; Pituitary-Adrenal System - physiology; Stress; Stress, Psychological - drug therapy; Stress, Psychological - metabolism; Stress, Psychological - pathology; Thiazepines - therapeutic use; tianeptine; Tupaia; Tupaia belangeri
• ISSN: 0027-8424; 1091-6490
• DOI: 10.1073/pnas.211427898

Stress-induced structural remodeling in the adult hippocampus, involving debranching and shortening of dendrites and suppression of neurogenesis, provides a cellular basis for understanding the impairment of neural plasticity in the human hippocampus in depressive illness. Accordingly, reversal of structural remodeling may be a desirable goal for antidepressant therapy. The present study investigated the effect of tianeptine, a modified tricyclic antidepressant, in the chronic psychosocial stress model of adult male tree shrews (Tupaia belangeri), a model with high validity for research on the pathophysiology of major depression. Animals were subjected to a 7-day period of psychosocial stress to elicit stress-induced endocrine and central nervous alterations before the onset of daily oral administration of tianeptine (50 mg/kg). The psychosocial stress continued throughout the treatment period of 28 days. Brain metabolite concentrations were determined in vivo by proton magnetic resonance spectroscopy, cell proliferation in the dentate gyrus was quantified by using BrdUrd immunohistochemistry, and hippocampal volume was measured post mortem. Chronic psychosocial stress significantly decreased in vivo concentrations of N-acetyl-aspartate (-13%), creatine and phosphocreatine (-15%), and choline-containing compounds (-13%). The proliferation rate of the granule precursor cells in the dentate gyrus was reduced (-33%). These stress effects were prevented by the simultaneous administration of tianeptine yielding normal values. In stressed animals treated with tianeptine, hippocampal volume increased above the small decrease produced by stress alone. These findings provide a cellular and neurochemical basis for evaluating antidepressant treatments with regard to possible reversal of structural changes in brain that have been reported in depressive disorders.