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Front Neuroendocrinol. 2019 Oct 22:100800. doi: 10.1016/j.yfrne.2019.100800. [Epub ahead of print]

Inflammation and the Dimensions of Depression: A Review.

Author information

1
Department of Biobehavioral Health, The Pennsylvania State University, University Park, PA, USA. Electronic address: mum366@psu.edu.
2
Department of Psychiatry, Pennsylvania State College of Medicine, Penn State Milton S. Hershey Medical Center, Hershey, PA, USA. Electronic address: esaunders@hmc.psu.edu.
3
Department of Biobehavioral Health, The Pennsylvania State University, University Park, PA, USA; Center for Healthy Aging, The Pennsylvania State University, University Park, Pennsylvania, PA, USA; College of Nursing, The Pennsylvania State University, University Park, Pennsylvania, USA. Electronic address: cge2@psu.edu.

Abstract

Patients with depressive disorders show a wide range of clinical manifestations including cognitive and neurovegetative symptoms. Importantly, these symptoms can differ in terms of biological etiology, and deconstructing depression into specific symptoms may provide valuable insight into the underlying neurobiology. Little research has examined inflammation in the context of depressive dimensions. Here we conduct a narrative review of the existing literature (21 studies) to elucidate whether the depression-inflammation link is symptom specific. Overall, there is evidence that an association exists between neurovegetative symptoms of depression and inflammation, independent of cognitive symptoms. The same cannot be said of cognitive symptoms and inflammation. There is also some evidence of gender differences in the directionality of the relationship between depression and inflammation. Potential explanations for these findings, limitations of the existing literature and recommendations for future research design are discussed.

KEYWORDS:

C-reactive protein; anhedonia; cognitive symptom; cytokine; depressive symptom; fatigue; mood; neurovegetative symptom; somatic symptom

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