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TRAIL Death Receptor-4, Decoy Receptor-1 and Decoy Receptor-2 Expression on CD8+ T Cells Correlate with the Disease Severity in Patients with Rheumatoid Arthritis
BMC Musculoskeletal Disorders volume 11, Article number: 192 (2010)
Rheumatoid Arthritis (RA) is a chronic autoimmune inflammatory disorder. Although the pathogenesis of disease is unclear, it is well known that T cells play a major role in both development and perpetuation of RA through activating macrophages and B cells. Since the lack of TNF-Related Apoptosis Inducing Ligand (TRAIL) expression resulted in defective thymocyte apoptosis leading to an autoimmune disease, we explored evidence for alterations in TRAIL/TRAIL receptor expression on peripheral T lymphocytes in the molecular mechanism of RA development.
The expression of TRAIL/TRAIL receptors on T cells in 20 RA patients and 12 control individuals were analyzed using flow cytometry. The correlation of TRAIL and its receptor expression profile was compared with clinical RA parameters (RA activity scored as per DAS28) using Spearman Rho Analysis.
While no change was detected in the ratio of CD4+ to CD8+ T cells between controls and RA patient groups, upregulation of TRAIL and its receptors (both death and decoy) was detected on both CD4+ and CD8+ T cells in RA patients compared to control individuals. Death Receptor-4 (DR4) and the decoy receptors DcR1 and DcR2 on CD8+ T cells, but not on CD4+ T cells, were positively correlated with patients' DAS scores.
Our data suggest that TRAIL/TRAIL receptor expression profiles on T cells might be important in revelation of RA pathogenesis.
Rheumatoid arthritis (RA) is a chronic autoimmune disease, which affects the synovial membrane and eventually causes irreversible destruction of tendons, cartilage, and bone [1–3]. It has long been suspected that the inflammatory lesions result from an autoimmune response to joint-specific antigens primarily involving the cells of the immune system [4–7]. Although disease commences with T cells recognizing antigen, this recognition event also drives a chronic inflammatory process involving the activation of macrophages and B cells [8, 9]. The chronic inflammation is in turn perpetuated by activation of both CD4+ and CD8+ T cells .
Programmed cell death is an apoptotic mechanism by which damaged cells are removed from the body. Engagement of autoreactive T cells by self antigens within the thymus induces deletion of potentially harmful T cells. Defects in apoptosis lead to the persistence of T cells recognizing self antigens which can induce autoimmunity [11, 12]. Clonally expanded T cells that have served their functional purpose are also cleared from the system through activation induced cell death (AICD) involving cell surface FasL/Fas receptor interaction . Children with defective Fas-mediated T lymphocyte apoptosis exhibit a disorder known as autoimmune lymphoproliferative syndrome [14, 15]. Like FasL, TNF has also been involved in AICD , although unlike CD95, TNF initiates and exacerbates autoimmune diseases. A third member of TNF superfamily is the TNF Related Apoptosis Inducing Ligand (TRAIL) . In the immune system, TRAIL is expressed on the surface of activated T lymphocytes. Five different receptors interact with TRAIL: TRAIL Receptor-1 (TRAIL-R1/also referred to as DR4), TRAIL Receptor-2 (TRAIL-R2/DR5), TRAIL Receptor-3 (TRAIL-R3/DcR1), TRAIL Receptor-4 (TRAIL-R4/DcR2), and osteoprotegrin (OPG) [18, 19]. DR4 and DR5 are the genuine death receptors inducing apoptosis whereas DcR1 and DcR2 function as decoy receptors and physiologically block apoptosis [20, 21], which might thus contribute to the pathogenesis of autoimmunity [22, 23]. Like CD95L, TRAIL has been reported to be a potent inhibitor of autoimmune arthritis . Unlike TNF and FasL, TRAIL inhibits the activation and proliferation of lymphocytes in vivo, but does not delete them from the system.
It is apparent then that FasL, TNF and the TRAIL/TRAIL receptor system are involved in T cell activation and/or deletion . Accordingly, here we demonstrate the potential usage of TRAIL and the expression profile of its receptors on peripheral T cell subsets as markers to monitor the prognosis of patients with rheumatoid arthritis.
Clinical Assessment of Patients with Rheumatoid Arthritis
20 RA patients and 12 age-/sex-matched control individuals were enrolled in the study conducted at the Rheumatology Clinic of Akdeniz University Hospitals. RA patients were classified according to the American Rheumatism Association 1987 revised criteria. DAS28-3 scoring (including tender joint counts, swollen joint counts and erythrocyte sedimentation rate-ESR) was used for each RA patient to assess the severity of disease. RA patients previously not treated with disease modifying anti-rheumatic drugs (anti-TNF agents) were admitted to the study. These patients had the history of receiving either non-steroidal anti-inflammatory drugs (NSAIDs) or analgesics prior to analysis.
Collection and analysis of blood samples
Analysis of peripheral blood lymphocytes was performed by direct immunofluorescence flow cytometry using a Coulter EPICS ALTRA XL instrument. The following monoclonal antibodies (mAb) were used: Phycoerythrin (PE) anti-human DR4 (CD261, TRAIL-R1, Cat No: 12-6644-73, eBioscience Inc., San Diego, CA, USA), PE anti-human DR5 (CD262, TRAIL-R2, Cat No: 12-9908-73, eBioscience Inc., San Diego, CA, USA), PE anti-human DcR1 (CD263, TRAIL-R3, TRAILR3, LIT, TRID Cat No: 12-6238-73, eBioscience Inc., San Diego, CA, USA), PE anti-human DcR2 (CD264, TRAIL-R4, TRAILR4, TRUNDD, TNFRSF10 D Cat No: 12-6239-73, eBioscience Inc., San Diego, CA, USA), PE anti-human TRAIL (CD253 Cat No: 12-9927-73, eBioscience Inc., San Diego, CA, USA), Fluorescein isothiocyanate (FITC) anti-human CD4 (L3T4 Cat No: A07750, Beckman Coulter, Immunotech, Marseille, France), FITC anti-human CD8 (Cat No: IM0451U, Beckman Coulter, Immunotech, Marseille, France), PE Mouse IgG1 (κ Isotype Control Cat No: 12-4714-73, eBioscience Inc., San Diego, CA, USA), FITC Mouse IgG1 (κ Isotype Control Cat No: A07795, Beckman Coulter, Immunotech, Marseille, France) and FITC Mouse IgG2a (Isotype Control Cat No: 11-4724-73, eBioscience Inc., San Diego, CA, USA).
Flow Cytometry Procedure
Reaction conditions for FC were as follows: 50 μl of each sample was diluted with 50 μl PBS solution (phosphate buffered saline; 0.01 M sodium phosphate, 0.145 M sodium chloride, Ph 7.2), and stained using 10 μl of either FITC (Fluorescein isothiocyanate) conjugated mouse monoclonal antihuman CD4 antibody or FITC conjugated mouse monoclonal antihuman CD8 antibody. PE (Phycoerythrin) conjugated mouse monoclonal antihuman TRAIL or its receptor antibodies were added subsequently to each tube. Both the activation status of T cells (CD4+CD25+) and the amount of regulatory T cells (CD4+CD25+FoxP3+) present were revealed using CD25 ECD (Beckman Coulter, 6607112) and APC-anti-human Foxp3 (eBioscience, 17-4776-73) antibodies. Tubes were incubated in the dark at room temperature for 20 minutes. Erythrocytes were eliminated from PBL using ammonium chloride lysing solution. After two washes with PBS, the cells were resuspended and analyzed by flow cytometry. A calibration based on lymphocyte gating was performed on EPICS Altra XL system using CD45 fluorescence and side scatter parameters prior to analysis. The peripheral blood samples were analyzed within 6 hours so that the gate could still be drawn around lymphocytes. Isotype matched antibodies were included to control for non-specific binding. All results were analyzed using Expo32 Altra software (Beckman-Coulter, Fullerton, CA).
Written informed consent relating to the Declaration of Helsinki was obtained from all patients. The study was approved by Akdeniz University Local Committee on Ethics.
The statistical package for the Social Sciences 13.0 software for Windows (SPSS Inc., Chicago, Ill) and GraphPad Prism version 5 (La Jolla, CA, USA) were used to plot the data and perform statistical analyses. In addition, SmartDraw Health Science Edition (San Diego, CA, USA) was used as a graphics software package. Normality tests were conducted using a Shapiro-Wilk method. T cell subsets (CD4+ and CD8+ T cells) in both groups displayed a normal distribution. Thus, a nonparametric unpaired student's T test was used to evaluate CD4+/CD8+ T cell ratios. On the other hand, a Gaussian distribution was not observed between normal versus RA patients when analyzing TRAIL and TRAIL receptor expression profiles. For this reason, Mann-Whitney U test was used to compare CD4+ versus CD8+ T cell associated TRAIL marker expression in patients. All correlation analyses used Spearman's Rho tests.
Flow Cytometric Analysis of Peripheral Blood T Lymphocytes
Given the heterogeneous nature of rheumatoid arthritis, and evidence for variation in the ratio of CD4+/CD8+ T cells changes in autoimmune diseases such as Systemic Lupus Erythematosus (SLE) [26–28], we first characterized the composition of peripheral blood T cell subsets in RA patients using flow cytometry. Nonparametric unpaired student's T test was used to detect possible differences in the two T cell subsets between normal versus RA patients. As shown in Figure 1, no difference was detected in the ratio of CD4+ (p = 0.63) to CD8+ (p = 0.22) T cells between the two groups. We conclude that, unlike Systemic Lupus Erythematosus, disease status does not alter the ratio of CD4+ to CD8+ T cell subsets in RA.
Membrane bound TRAIL and its receptor expression profile on peripheral CD4+ T lymphocytes in RA patients versus control individuals
During the development of RA, CD4+ T cells initiate and regulate several cell-mediated immune processes that cause synovial inflammation and joint destruction in response to activation by antigen presentation. We next examined the CD4 + T lymphocyte associated cell-surface expression profile of TRAIL and its receptors isolated from either healthy volunteers or RA patients using flow cytometry. The Mann-Whitney U test was used to compare the two groups. As shown in Figure 2A, CD4 + T cells obtained from RA patients exhibited higher levels of expression of TRAIL and its death/decoy receptors compared to cells from control individuals (p < 0.05). Representative flow cytometric analyses of CD4 + T cells isolated from a healthy individual and an RA patient are shown in Figure 2B, while Figure 2C indicates the relative increase in marker expression levels. These data show a 35-fold increase in DcR1 expression with a 10-15-fold increase in the other markers.
Using a Spearman Rho correlation test to evaluate correlations between expression of TRAIL and TRAIL receptors on CD4+ T cells in RA patients, we found increased DR4 expression was correlated with an increase in both DR5 and TRAIL (Table 1). In addition, DcR1 and DcR2 expression showed strong correlation (p < 0.01).
CD8+ T cell associated TRAIL and its receptor expression profile in RA
We next investigated the expression of TRAIL and its receptors on CD8 + T cells of RA patients and compared with healthy controls, similar to CD4 + T cells, we found significant differences between the two groups as shown in Figure 3A (p < 0.05). Representative FC data from a patient and control are shown in Figure 3B, with Figure 3C indicating the relative increase in CD8+ T cell associated TRAIL and its receptor expression. In this case increased DcR1 expression (about 66 fold) was the most marked. A correlation between CD8+ T cell associated TRAIL and receptor expression was investigated using Spearmen Rho Correlation analysis. As shown in Table 2, a correlation among the death and the decoy receptors as well as with TRAIL death ligand expression was observed.
A non-parametric Mann-Whitney U test was administered to investigate statistical differences in expression levels between CD4+ and CD8+ T cell associated TRAIL and its receptors in patients with RA. Our results indicated that expression levels of TRAIL and its receptors were higher on CD8+ T cells (Figure 3A) than on CD4+ T cells (Figure 2A).
CD8+ T cell associated DR4, DcR1 and DcR2 expression levels correlated with DAS28 scores in RA patients
Finally we investigated evidence for a correlation between TRAIL and its receptor expression profile and the severity of disease in RA patients. Interestingly only CD8+ T cell associated (Figure 4) but not CD4+ T cell associated (data not shown) DR4, DcR1 and DcR2 expression levels correlated with DAS28 scores in RA patients.
T cell activation status of newly diagnosed RA patients
CD25 is one commonly used marker for recently activated T cells . In order to document the activation status of T cells in RA patients; another set of flow cytometry assay was conducted. As shown in Table 3, the percentage of CD4+CD25+ T cells was statistically higher in RA patients compared to control individuals. However, as shown before both activated and regulatory T cells (Treg) can express CD25 marker on the cell surface . To distinguish these two, FoxP3 staining was employed as described in Materials and Methods. No difference was noted in the amount of Treg (CD4+CD25+ FoxP3+) between RA and control patients (Table 3).
It has previously been reported that negative selection of T cells in the thymus is controlled by TRAIL . For example, mice deficient in TRAIL had a severe defect in thymic deletion of T cells and were hypersensitive to collagen-induced arthritis . Evidence for functional consequences of TRAIL over-expression in autoimmune diseases including rheumatoid arthritis has emerged from gene therapy studies . Although TRAIL is not cytotoxic to normal cells , hyperplastic human RA synovial fibroblasts in culture and RA-activated rabbit synovial tissue in vivo were sensitive to adenoviral delivery of human TRAIL . The effect of TRAIL expression on blood lymphocytes was reported to be different (killing versus suppression) than that observed with RA synovial cells. These studies suggested that TRAIL can inhibit the activation and proliferation of lymphocytes in vivo, but does not necessarily delete them from the system .
The TRAIL/TRAIL receptor system has recently been implicated as a disease activation marker in cancer. High DcR2 expression levels in patients with prostate cancer (PCa) indicate a poorer prognosis, with this marker strongly correlated with high Gleason Scores, Prostate Specific Antigen (PSA) recurrence and decreased survival in PCa patients . In patients with invasive ductal carcinoma, however, high levels of DR4 expression are positively correlated with tumor grade and with poor prognosis . Two recent studies have linked high levels of endogenous TRAIL expression to increased cell death in human pancreatic tissue, supporting the idea that TRAIL might be implicated in the development of autoimmune diseases such as Type 1 Diabetes [38, 39]. Despite this information, there is no information concerning the profile of the TRAIL/TRAIL receptor system in the development of RA.
We analyzed peripheral blood lymphocytes of 20 RA patients and 12 control individuals by flow cytometry to detect their TRAIL/TRAIL receptor profile. T cell lymphocytes of healthy control individuals expressed low levels of TRAIL and TRAIL receptors on the cell surface. While this is in accordance with a study conducted by Lu et al. , Hasegawa et al. have shown that only DcR2 expression but no other TRAIL receptor expression was detectable on CD8+ T cells . Differences between these studies including ours could be attributed to differences in monoclonal antibodies used. Nevertheless, both CD4+ and CD8+ T lymphocytes of RA patients displayed higher levels of TRAIL and its receptors on the cell surface compared to healthy control individuals. Since PCa patients can be separated from patients with benign prostate hyperplasia by the amount of TRAIL/TRAIL receptor present in prostate tissue  our observations suggest that it might be useful to monitor TRAIL/TRAIL receptor expression in peripheral blood lymphocytes in RA patients at diagnosis and during the course of their disease. The most dramatic change in the amount of TRAIL/TRAIL receptor present on peripheral blood lymphocytes of RA patients was the increased DcR1 expression seen in both CD4+ and CD8+ T cells. Recently, elevated expression of DcR1 was detected in antigen specific T cells of patients with multiple sclerosis (MS) . These antigen specific T cell clones were also resistant to TRAIL mediated apoptosis. One interpretation of these data is that antigen specific T cell clones increase their survival following DcR1 upregulation.
Based on our flow cytometry analysis, RA patients displayed higher levels of activated T cells compared to healthy controls. This finding is in accordance with previous studies demonstrating the presence of higher levels of CD4+CD25+ peripheral blood lymphocytes in RA patients compared to healthy individuals [43, 44]. However we did not observe any change in the level of CD4+CD25+ FoxP3+ T cells between RA and control groups. In accordance with previous studies, no relationship was found between disease activity and CD4+CD25+ or CD4+CD25+ FoxP3+ T cells in RA patients . Whether any subtle increase in TRAIL or TRAIL receptor expression observed on CD4+ T cells in RA patients is simply a consequence of T cell activation remains to be clarified.
Clinical evaluation of RA patients involves RA activity scoring (DAS28). Intriguingly, only the CD8+ T cell associated DR4, DcR1 and DcR2 expression levels correlated with DAS28 scores in patients with RA, implying that altered TRAIL receptor profiles on CD8+ T cell subsets rather than on CD4+ T cells is more important in terms of disease severity.
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The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2474/11/192/prepub
This work is supported by the grant from Akdeniz University Scientific Research Project Administration Division and Health Science Institute (2008.03.0122.001).
The authors declare that they have no competing interests.
AB, CA and BY carried out all the assays, ET, NB and VY provided clinical data, RMG and CAA were responsible with flow cytometry procedures, HB acted as scientific consultant, SS coordinated and supervised the study. All the authors read and approved the final manuscript.
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Bisgin, A., Terzioglu, E., Aydin, C. et al. TRAIL Death Receptor-4, Decoy Receptor-1 and Decoy Receptor-2 Expression on CD8+ T Cells Correlate with the Disease Severity in Patients with Rheumatoid Arthritis. BMC Musculoskelet Disord 11, 192 (2010) doi:10.1186/1471-2474-11-192
- Rheumatoid Arthritis
- Systemic Lupus Erythematosus
- Rheumatoid Arthritis Patient
- DAS28 Score
- Rheumatoid Arthritis Synovial Fibroblast