The glucocorticoid receptor: pivot of depression and of antidepressant treatment?
Hyperactivity of the hypothalamus-pituitary-adrenal (HPA) axis and increased levels of glucocorticoid hormones in patients with depression have mostly been ascribed to impaired feedback regulation of the HPA axis, possibly caused by altered function of the receptor for glucocorticoid hormones, the glucocorticoid receptor (GR). Antidepressants, in turn, ameliorate many of the neurobiological disturbances in depression, including HPA axis hyperactivity, and thereby alleviate depressive symptoms. There is strong evidence for the notion that antidepressants exert these effects by modulating the GR. Such modulations, however, can be manifold and range from regulation of receptor expression to post-translational modifications, which may result in differences in GR nuclear translocation and GR-dependent gene transcription. The idea that the therapeutic action of antidepressants is mediated, at least in part, by restoring GR function, is consistent with studies showing that decreased GR function contributes to HPA axis hyperactivity and to the development of depressive symptoms. Conversely, excessive glucocorticoid signalling, which requires an active GR, is associated with functional impairments in the depressed brain, especially in the hippocampus, where it results in reduced neurogenesis and impaired neuroplasticity. In this review, we will focus on the GR as a key player in the precipitation, development and resolution of depression. We will discuss potential explanations for the apparent controversy between glucocorticoid resistance and the detrimental effects of excessive glucocorticoid signalling. We will review some of the evidence for modulation of the GR by antidepressants and we will provide further insight into how antidepressants may regulate the GR to overcome depressive symptoms.
Anacker
Christoph
C
King's College London, Institute of Psychiatry, Centre for the Cellular Basis of Behaviour (CCBB), Department of Psychological Medicine, Section of Perinatal Psychiatry & Stress, Psychiatry and Immunology (SPI-lab), 125 Coldharbour Lane, London SE5 9NU, UK. Christoph.Anacker@kcl.ac.uk
Zunszain
Patricia A
PA
Carvalho
Livia A
LA
Pariante
Carmine M
CM
D000818:Animals; D000928:Antidepressive Agents / Q000494:pharmacology / Q000627:therapeutic use*; D003863:Depression / Q000188:drug therapy* / Q000235:genetics; D006801:Humans; D008954:Models, Biological; D058990:Molecular Targeted Therapy; D011965:Receptors, Glucocorticoid / Q000037:antagonists & inhibitors / Q000235:genetics / Q000502:physiology*; D015398:Signal Transduction / Q000235:genetics; D013315:Stress, Psychological / Q000150:complications / Q000235:genetics
D000928:Antidepressive Agents; D011965:Receptors, Glucocorticoid
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