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Letter

Cytokines in the colon of a patient with Behçet's disease

Jasper H Kappen1, Willem A Dik2, Gemma M Dingjan2, Paul L van Daele12, Herbert Hooijkaas2, P Martin van Hagen12 and Jan A van Laar12*

Author Affiliations

1 Department of Internal Medicine, Clinical Immunology Section, Erasmus MC, University Medical Center, room D419, 's Gravendijkwal 230, 3055CE, Rotterdam, The Netherlands

2 Department of Immunology, Erasmus MC, University Medical Center, room D419, 's Gravendijkwal 230, 3055CE, Rotterdam, The Netherlands

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Arthritis Research & Therapy 2009, 11:412  doi:10.1186/ar2784


See related research article by Cañete et al., http://arthritis-research.com/content/11/1/R17 and related editorial by van Laar et al., http://arthritis-research.com/content/11/2/109


The electronic version of this article is the complete one and can be found online at: http://arthritis-research.com/content/11/4/412


Published:27 August 2009

© 2009 BioMed Central Ltd

Letter

We read with interest the article by Cañete and colleagues [1] in a recent issue of Arthritis Research & Therapy, in which they describe cytokine patterns of inflamed joints from patients with Behçet's disease (BD). The authors show that neutrophils and T lymphocytes are involved in a Th1-skewed inflammatory pattern expressed by elevations of interferon-gamma (IFN-γ), tumor necrosis factor-alpha (TNF-α), and interleukin-2 (IL-2). Also, increased levels of IL-4, IL-10, and IL-17 were observed. We would like to add to these observations our data showing a similar cytokine profile in the colon of a patient with BD.

A 37-year-old BD patient with severe colitis failed to respond to traditional immunosuppressive treatment. Steroids were contraindicated because of a previous retinal serosal ablation, probably induced by prednisone. TNF blockage initially successfully reduced the severity of the colitis, but relapses occurred. Variation of different TNF blockers (etanercept, infliximab, and adalimumab) could not permanently resolve the intestinal complaints. Antibodies against infliximab or adalimumab were not detected. Eventually, high-dose infliximab (10 mg/kg) and intravenous immunoglobulins (IVIGs) led to disease regression facilitating a hemicolectomy. Thereafter, the patient's condition improved significantly and IVIGs were terminated while TNF blockage was continued.

Cytokines were evaluated in the resected colon by analyzing mRNA expression levels of cytokine genes as previously described [2]. Because of the extensive prior treatment, the patient served as an internal control. Intestinal inflammation was patchy, and the observed difference between healthy and diseased tissues was confirmed microscopically. The mRNA expression of cytokines in diseased colon is presented relative to that of healthy colon and can be seen as a reflection of intramural cytokines (Figure 1). Like Cañete and colleagues, we observed a Th1- and Th17-skewed pattern (elevated IFN-γ and TNF-α and elevated IL-17A, respectively). We could not demonstrate elevation of IL-10, possibly because our patient was intensively treated and the colon environment is not sterile.

thumbnailFigure 1. Relative mRNA expression of cytokine genes in affected colonic tissue of a patient with Behçet's disease. Diseased colonic tissue and healthy colonic tissue from the same patient were analyzed. IFN-γ, interferon-gamma; IL, interleukin; TNF, tumor necrosis factor.

The immunopathology of BD remains fascinating and highly relevant to the development of future immune-directed therapy. Since the successful introduction of TNF blockers, it became apparent that Th1-cytokines might be key players in the immunopathology of BD, emphasizing the importance of cytokine studies [3,4]. Cañete and colleagues [1] have highlighted the importance of tissue evaluation in cytokine studies. In this light, our data add to their observations that, in colonic tissue of a BD patient, IFN-γ, TNF-α, and IL-17A appear to be key cytokines, even in a treated patient.

Abbreviations

BD: Behçet's disease; IFN-γ: interferon-gamma; IL: interleukin; IVIG: intravenous immunoglobulin; TNF: tumor necrosis factor.

Competing interests

The authors declare that they have no competing interests.

References

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    Arthritis Res Ther 2009, 11:R17. PubMed Abstract | BioMed Central Full Text | PubMed Central Full Text OpenURL

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    Blood 2007, 110:388-392. PubMed Abstract | Publisher Full Text OpenURL

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  4. van Laar JA, Missotten T, van Daele PL, Jamnitski A, Baarsma GS, van Hagen PM: Adalimumab: a new modality for Behçet's disease?

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