Chronic social stress: effects on limbic brain structures

• Published in: Physiology & behavior Vol. 79; no. 3; pp. 417 - 427
• Main Authors: Fuchs, Eberhard, Flügge, Gabriele
• Format: Journal Article
• Language: English
• Published: Cambridge Elsevier Inc 01.08.2003; New York, NY Elsevier
• Subjects: Amygdala; Amygdala - physiopathology; Animals; Biogenic Monoamines - physiology; Biological and medical sciences; Chronic Disease; Cingulate cortex; Disease Models, Animal; Dopamine; Fundamental and applied biological sciences. Psychology; Glucocorticoids; Hippocampus; Hippocampus - physiopathology; Hypothalamus; Hypothalamus - physiopathology; Limbic System - physiopathology; Neural Pathways - physiopathology; Neurogenesis; Noradrenaline; Personality. Affectivity; Psychology. Psychoanalysis. Psychiatry; Psychology. Psychophysiology; Serotonin; Social Environment; Stress; Stress, Psychological - physiopathology; Tupaiidae; Dopamine; Amygdala; Cingulate cortex; Serotonin; Glucocorticoids; Hypothalamus; Neurogenesis; Noradrenaline; Hippocampus; Human; Intraspecific relation; Hypothalamohypophysoadrenal axis; Central nervous system; Limbic system; Review; Catecholamine; Hydrocortisone; Glucocorticoid; Stress; Chronic; Social interaction; Adrenal hormone; Neurotransmitter; Norepinephrine; Brain (vertebrata)
• ISSN: 0031-9384; 1873-507X
• DOI: 10.1016/S0031-9384(03)00161-6

Different types of stressors are known to activate distinct neuronal circuits in the brain. Acute physiological stimuli that are life threatening and require immediate reactions lead to a rapid stimulation of brainstem and hypothalamus to activate efferent visceral pathways. In contrast, psychological stressors activate higher-order brain structures for further interpretations of the perceived endangerment. Common to the later multimodal stressors is that they need cortical processing and, depending on previous experience or ongoing activation, the information is assembled within limbic circuits connecting, e.g., the hippocampus, amygdala and prefrontal cortex to induce neuroendocrine and behavioral responses. In view of the fact that stressful life events often contribute to the etiology of psychopathologies such as depressive episodes, several animal models have been developed to study central nervous mechanisms that are induced by stress. The present review summarizes observations made in the tree shrew chronic psychosocial stress paradigm with particular focus on neurotransmitter systems and structural changes in limbic brain regions.