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Journal of Immunology Research
Volume 2018, Article ID 5954897, 9 pages
https://doi.org/10.1155/2018/5954897
Research Article

Influence of Biological Therapeutics, Cytokines, and Disease Activity on Depression in Rheumatoid Arthritis

1Medical Psychology Unit, Department of Clinical Neurosciences and Mental Health, Faculty of Medicine, University of Porto, Porto, Portugal
2I3S Instituto de Investigação e Inovação em Saúde, Porto, Portugal
3Department of Microbiology and Molecular Biology, Brigham Young University, Provo, UT, USA
4Laboratorio Nobre, Faculty of Medicine, University of Porto, Porto, Portugal
5Rheumatology Department, Hospital of São João EPE, Porto, Portugal
6Departamento de Psicologia Aplicada (DPA), Universidade do Minho, Braga, Minho, Portugal

Correspondence should be addressed to Margarida Figueiredo-Braga; tp.pu.dem@bfmm

Received 24 February 2018; Revised 21 April 2018; Accepted 10 June 2018; Published 17 July 2018

Academic Editor: Fabiano Carvalho

Copyright © 2018 Margarida Figueiredo-Braga et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Purpose. Rheumatoid arthritis (RA) is an often debilitating autoinflammatory disease. Patients with rheumatoid arthritis are often troubled by co-occurring depression or other psychological manifestations. RA patients have a variety of treatment options available, including biologicals that inhibit cytokines or immune cells. If these cytokines influence the psychological symptoms, then the use of cytokine inhibitors should modulate these symptoms. Methods. A cohort of 209 individuals was recruited. This group included 82 RA patients, 22 healthy subjects, 32 depressed control subjects, and 73 subjects with systemic lupus erythematosus. Of the RA patients, 51% were on a biological therapeutic. ELISA was used to measure cytokine levels. A variety of psychological assessments were used to evaluate depression, anxiety, sleep, fatigue, and relationship status. Clinical values were obtained from medical records. Results. IL-10 concentration was associated with depressive symptoms in the RA patients, healthy controls, and the lupus patients. In the patients with primary depression, depressive symptoms were associated with IL-6 and TNF-alpha. In RA patients, Tocilizumab use was associated with decreased depressive symptoms. 14 RA patients who were not using biologicals began using them by a one-month follow-up. In these patients, there was no significant change to any value except for fatigue. Conclusions. A variety of both biological and social factors influences depressive symptoms in RA. IL-10 and IL-6 are likely to be involved, since IL-10 concentration was associated with depression and Tocilizumab decreased depressive symptoms in the RA patients. The roles of these cytokines are different in RA and lupus, as high IL-10 in RA is associated with increased depressive symptoms, but high IL-10 in the lupus patients is associated with decreased depression. IL-6 was also associated with depressive symptoms in the patients with primary depression. These results strongly indicate that disease activity, including cytokine levels, has a strong impact on depressive symptoms.