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Licensed Unlicensed Requires Authentication Published by De Gruyter March 20, 2019

Detection of systemic inflammation in severely impaired chronic pain patients and effects of a multimodal pain rehabilitation program

Eva-Britt Hysing ORCID logo EMAIL logo , Lena Smith , Måns Thulin , Rolf Karlsten , Kristoffer Bothelius and Torsten Gordh

Abstract

Background and aims

Recent research indicates a previously unknown low-grade systemic or neurogenic inflammation in groups of chronic pain (CP) patients. Low-grade inflammation may have an important role in symptoms that have previously not been well depicted: widespread pain, tiredness and cognitive dysfunctions frequently seen in severely impaired CP patients. This study aimed to investigate the plasma inflammatory profile in a group of very complex CP patients at baseline and at a 1-year follow-up after participation in a cognitive behavior therapy (CBT)-based multimodal pain rehabilitation program (PRP).

Methods

Blood samples were collected from 52 well-characterized CP patients. Age- and sex-matched healthy blood donors served as controls. The samples were analyzed with a multiple Proximal Extension Analysis allowing a simultaneous analysis of 92 inflammation-related proteins consisting mainly of cytokines, chemokines and growth-factors. At follow-up, 1-year after participation in the RPR samples from 28 patients were analyzed. The results were confirmed by a multi-array technology that allows quantitative estimation.

Results

Clear signs of increased inflammatory activity were detected in the CP patients. Accepting a false discovery rate (FDR) of 5%, there were significant differences in 43/92 inflammatory biomarkers compared with the controls. In three biomarkers (CXCL5, SIRT2, AXIN1) the expression levels were elevated more than eight times. One year after the PRP, with the patients serving as their own controls, a significant decrease in overall inflammatory activity was found.

Conclusions

Our results indicate that the most impaired CP patients suffer from low-grade chronic systemic inflammation not described earlier with this level of detail. The results may have implications for a better understanding of the cluster of co-morbid symptoms described as the “sickness-syndrome” and the wide-spread pain seen in this group of patients. The decrease in inflammatory biomarkers noted at the follow-up after participation in the PRP may reflect the positive effects obtained on somatic and psycho-social mechanisms involved in the inflammatory process by a rehabilitation program. Besides the PRP, no major changes in medication or lifestyle factors were implemented during the same period. To our knowledge, this is the first study reporting that a PRP may induce inflammatory-reducing effects. Further studies are needed to verify the objective findings in CP patients and address the question of causality that remains to be solved.

Implications

The findings offer a new insight into the complicated biological processes underlying CP. It may have implications for the understanding of symptoms collectively described as the “sickness-syndrome” – frequently seen in this group of patients. The lowering of cytokines after the participation in a PRP indicate a new way to evaluate this treatment; by measuring inflammatory biomarkers.

Funding source: Swedish Research Council

Award Identifier / Grant number: P29797-1

Funding statement: The research project was supported by Uppsala University Hospital, Uppsala University and Uppsala Berzelii Technology Centre for Neurodiagnostics, with financing from the Swedish Governmental Agency for Innovation Systems (VINNOVA) and the Swedish Research Council (grant no. P29797-1).

  1. Authors’ statements

  2. Conflict of interest: The authors state no conflict of interest.

  3. Informed consent: All study participants provided written informed consent.

  4. Ethical improvement: The study was approved by the Regional Ethical Review Board in Uppsala, Sweden (Dnr 2010/182). The study was performed in accordance with the Declaration of Helsinki (1964 and later revisions).

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Received: 2018-11-20
Revised: 2019-01-30
Accepted: 2019-02-03
Published Online: 2019-03-20
Published in Print: 2019-04-24

©2019 Scandinavian Association for the Study of Pain. Published by Walter de Gruyter GmbH, Berlin/Boston. All rights reserved.

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