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Fatigue in patients with inflammatory bowel disease is associated with distinct differences in immune parameters

Authors Vogelaar L, de Haar C, Aerts BRJ, Peppelenbosch MP, Timman R, Hanssen BE, van der Woude CJ

Received 5 October 2016

Accepted for publication 16 January 2017

Published 2 May 2017 Volume 2017:10 Pages 83—90


Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 3

Editor who approved publication: Professor Andreas M Kaiser

Lauran Vogelaar, 1,* Colin de Haar,2,* Bas RJ Aerts,1 Maikel P Peppelenbosch,1 Reinier Timman,3 Bettina E Hanssen,1 C Janneke van der Woude1

1Department of Gastroenterology and Hepatology, Erasmus MC, Rotterdam, 2Applied Tumor Immunology, Laboratory of Translational Immunology, UMC Utrecht, Utrecht, 3Department of Psychiatry, Section of Medical Psychology and Psychotherapy, Erasmus MC, Rotterdam, the Netherlands

*These authors contributed equally to this work

Background: Although it is well recognized that fatigue is an important problem in many of the quiescent inflammatory bowel disease (IBD) patients, it is unknown whether the immune status is different in fatigued versus non-fatigued patients. In this study, we contrasted various characteristics of the immune system in fatigued against non-fatigued patients with IBD in clinical remission.
Patients and methods: Patients with IBD in clinical remission were phenotyped according to the Montreal classification, and the checklist individual strength-fatigue (CIS-fatigue) was used to assess fatigue (CIS-fatigue ≥ 35). Flow cytometry on peripheral blood samples was used to investigate differences in leukocyte subsets. The expression of various cytokines was determined in stimulated whole blood and serum samples using enzyme-linked immunosorbent assay. Differences between fatigued and non-fatigued patients with IBD were assessed.
Results: In total, 55 patients were included in the fatigue group (FG) and 29 patients in the non-fatigue group (NFG). No differences in demographic and clinical characteristics were observed between the groups. Flow cytometry data showed a significantly lower percentage of monocytes (p = 0.011) and a higher percentage of memory T-cells (p = 0.005) and neutrophils (p = 0.033) in the FG compared with the NFG. Whole blood stimulation showed increased TNF-α (p = 0.022) and IFN-γ (p = 0.047) in the FG. The median serum level was significantly higher for IL-12 (p < 0.001) and IL-10 (p = 0.005) and lower for IL-6 (p = 0.002) in the FG compared with NFG.
Conclusion: Significant differences in immune profile between fatigued and non-fatigued patients with IBD in clinical remission were found, which point out to a chronically active and Th1-skewed immune system in patients with fatigue. Whether these immune differences are directly involved in the fatigue complaints via immune-to-brain communication pathways remains to be determined. As such, further exploration of the underlying immune effects associated with fatigue is warranted to determine potential treatment options.

Keywords: inflammatory bowel disease, fatigue, leukocyte subsets, cytokines

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