Abstract
Cytokines whose primary function is that of acting as signaling molecules of the immune system, have been implicated in the provocation or exacerbation of mood disorders such as depression. This position has been supported by several lines of evidence; (1) proinflammatory cytokines (interleukin-1β, interleukin-6, tumor necrosis factor-α) and bacterial endotoxins elicit sickness behaviors (e.g., fatigue, soporific effects) and symptoms of anxiety/depression that may be attenuated by chronic antidepressant treatment. Interleukin-2 (IL-2) induces less profound sickness, but elicits anhedonia, a key symptom of depression; (2) neuroendocrine and central neurotransmitter changes, reminiscent of those implicated in depression, may be elicited by some of these cytokines, and these effects are exacerbated by stressors; (3) severe depressive illness is accompanied by elevations of cytokine production or levels, although these effects are not necessarily attenuated with antidepressant medication; and (4) immunotherapy, using IL-2 or IFN-α, promote depressive symptoms that are attenuated by antidepressant treatment. It is proposed that chronic cytokine elevations engender neuroendocrine and brain neurotransmitter changes that are interpreted by the brain as being stressors, and contribute to the development of depression. Further, the effects of the cytokine treatments may act synergistically with stressors, and cytokines may provoke a sensitization effect so that the effects of later stressor experiences are exacerbated.
Keywords: cytokines, cortisol, corticotropin releasing hormone, depression, dopamine, hypothalamic-pituitary-adrenal axis, interleukin, norepinephrine, serotonin
Current Pharmaceutical Design
Title: Cytokines as a Precipitant of Depressive Illness: Animal and Human Studies
Volume: 11 Issue: 8
Author(s): Hymie Anisman, Zul Merali, Michael O. Poulter and Shawn Hayley
Affiliation:
Keywords: cytokines, cortisol, corticotropin releasing hormone, depression, dopamine, hypothalamic-pituitary-adrenal axis, interleukin, norepinephrine, serotonin
Abstract: Cytokines whose primary function is that of acting as signaling molecules of the immune system, have been implicated in the provocation or exacerbation of mood disorders such as depression. This position has been supported by several lines of evidence; (1) proinflammatory cytokines (interleukin-1β, interleukin-6, tumor necrosis factor-α) and bacterial endotoxins elicit sickness behaviors (e.g., fatigue, soporific effects) and symptoms of anxiety/depression that may be attenuated by chronic antidepressant treatment. Interleukin-2 (IL-2) induces less profound sickness, but elicits anhedonia, a key symptom of depression; (2) neuroendocrine and central neurotransmitter changes, reminiscent of those implicated in depression, may be elicited by some of these cytokines, and these effects are exacerbated by stressors; (3) severe depressive illness is accompanied by elevations of cytokine production or levels, although these effects are not necessarily attenuated with antidepressant medication; and (4) immunotherapy, using IL-2 or IFN-α, promote depressive symptoms that are attenuated by antidepressant treatment. It is proposed that chronic cytokine elevations engender neuroendocrine and brain neurotransmitter changes that are interpreted by the brain as being stressors, and contribute to the development of depression. Further, the effects of the cytokine treatments may act synergistically with stressors, and cytokines may provoke a sensitization effect so that the effects of later stressor experiences are exacerbated.
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Cite this article as:
Anisman Hymie, Merali Zul, Poulter O. Michael and Hayley Shawn, Cytokines as a Precipitant of Depressive Illness: Animal and Human Studies, Current Pharmaceutical Design 2005; 11 (8) . https://dx.doi.org/10.2174/1381612053381701
DOI https://dx.doi.org/10.2174/1381612053381701 |
Print ISSN 1381-6128 |
Publisher Name Bentham Science Publisher |
Online ISSN 1873-4286 |
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