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Takenaka SI, Kaieda S, Kawayama T, Matsuoka M, Kaku Y, Kinoshita T, Sakazaki Y, Okamoto M, Tominaga M, Kanesaki K, Chiba A, Miyake S, Ida H, Hoshino T. IL-38: A new factor in rheumatoid arthritis. Biochem Biophys Rep 2015; 4:386-391. [PMID: 29124228 PMCID: PMC5669445 DOI: 10.1016/j.bbrep.2015.10.015] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2015] [Revised: 10/16/2015] [Accepted: 10/29/2015] [Indexed: 11/18/2022] Open
Abstract
The newly characterized cytokine IL-38 (IL-1F10) belongs to the IL-1 family of cytokines. Previous work has demonstrated that IL-38 inhibited Candida albicans-induced IL-17 production from peripheral blood mononuclear cells. However, it is still unclear whether IL-38 is an inflammatory or an anti-inflammatory cytokine. We generated anti-human IL-38 monoclonal antibodies in order to perform immunohistochemical staining and an enzyme-linked immunosorbent assay. While human recombinant IL-38 protein was not cleaved by recombinant caspase-1, chymase, or PR3 in vitro, overexpression of IL-38 cDNA produced a soluble form of IL-38 protein. Furthermore, immunohistochemical analysis showed that synovial tissues obtained from RA patients strongly expressed IL-38 protein. To investigate the biological role of IL-38, C57BL/6 IL-38 gene-deficient (−/−) mice were used in an autoantibody-induced rheumatoid arthritis (RA) mouse model. As compared with control mice, IL-38 (−/−) mice showed greater disease severity, accompanied by higher IL-1β and IL-6 gene expression in the joints. Therefore, IL-38 acts as an inhibitor of the pathogenesis of autoantibody-induced arthritis in mice and may have a role in the development or progression of RA in humans. The soluble form of IL-38 is detected in the sera obtained from of RA patients. IL-38 protein was highly expressed in the synovial lining of RA synovium. IL-38 expression was up-regulated during arthritis in mice at the mRNA level. IL-38 may attenuate joint inflammation by inhibiting the IL-1 induced inflammation.
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Affiliation(s)
- Shin-ichi Takenaka
- Department of Medicine, Division of Respirology, Neurology and Rheumatology, Kurume University School of Medicine, Kurume 830-0011, Japan
| | - Shinjiro Kaieda
- Department of Medicine, Division of Respirology, Neurology and Rheumatology, Kurume University School of Medicine, Kurume 830-0011, Japan
| | - Tomotaka Kawayama
- Department of Medicine, Division of Respirology, Neurology and Rheumatology, Kurume University School of Medicine, Kurume 830-0011, Japan
| | - Masanobu Matsuoka
- Department of Medicine, Division of Respirology, Neurology and Rheumatology, Kurume University School of Medicine, Kurume 830-0011, Japan
| | - Yoichiro Kaku
- Department of Medicine, Division of Respirology, Neurology and Rheumatology, Kurume University School of Medicine, Kurume 830-0011, Japan
| | - Takashi Kinoshita
- Department of Medicine, Division of Respirology, Neurology and Rheumatology, Kurume University School of Medicine, Kurume 830-0011, Japan
| | - Yuki Sakazaki
- Department of Medicine, Division of Respirology, Neurology and Rheumatology, Kurume University School of Medicine, Kurume 830-0011, Japan
| | - Masaki Okamoto
- Department of Medicine, Division of Respirology, Neurology and Rheumatology, Kurume University School of Medicine, Kurume 830-0011, Japan
| | - Masaki Tominaga
- Department of Medicine, Division of Respirology, Neurology and Rheumatology, Kurume University School of Medicine, Kurume 830-0011, Japan
| | | | - Asako Chiba
- Department of Immunology, Juntendo University School of Medicine, Tokyo 113-8421, Japan
| | - Sachiko Miyake
- Department of Immunology, Juntendo University School of Medicine, Tokyo 113-8421, Japan
| | - Hiroaki Ida
- Department of Medicine, Division of Respirology, Neurology and Rheumatology, Kurume University School of Medicine, Kurume 830-0011, Japan
| | - Tomoaki Hoshino
- Department of Medicine, Division of Respirology, Neurology and Rheumatology, Kurume University School of Medicine, Kurume 830-0011, Japan
- CIP, NCI-Frederick, NIH, Frederick, MD 21702, United States
- Corresponding author at: Department of Medicine, Division of Respirology, Neurology and Rheumatology, Kurume University School of Medicine, Kurume 830-0011, Japan.Department of Medicine, Division of Respirology, Neurology and Rheumatology, Kurume University School of MedicineKurume830-0011Japan
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Suetomo M, Kawayama T, Kinoshita T, Takenaka S, Matsuoka M, Matsunaga K, Hoshino T. COPD assessment tests scores are associated with exacerbated chronic obstructive pulmonary disease in Japanese patients. Respir Investig 2014; 52:288-95. [PMID: 25169844 DOI: 10.1016/j.resinv.2014.04.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2014] [Revised: 04/03/2014] [Accepted: 04/30/2014] [Indexed: 10/25/2022]
Abstract
BACKGROUND Guidelines recommend chronic obstructive pulmonary disease (COPD) assessment tests (CATs) for evaluation of symptoms and management risks. To investigate whether CAT can predict moderate or severe exacerbations in Japanese COPD patients, a single-blinded prospective study was performed. METHODS A 123 Japanese COPD patients were classified into high-CAT (n=64) and low-CAT (n=59) groups. The frequencies and periods of moderate or severe exacerbation and hospitalization were compared between the two groups. Multivariate logistic regression analysis was performed to investigate whether CAT could predict exacerbations. A receiver operating characteristic (ROC) curve analysis was employed to find an appropriate CAT score for exacerbation. RESULTS The high-CAT group was significantly older, had a lower body mass index, and had a lower airflow obstruction as compared to the low CAT group. The frequency of moderate or severe exacerbation (1.3±1.3 events per patient per year, p<0.0001) and hospitalizations (0.2±0.4, p=0.0202) in the high-CAT group was significantly higher than in the low-CAT group (0.4±0.7 and 0.0±0.1, respectively). Multivariate logistic regression analysis showed that both high CAT score and low airflow obstruction were independently predictive of frequent moderate or severe COPD exacerbation. ROC analysis showed that the best cut-off CAT score for moderate or severe COPD exacerbation was 8 points. CONCLUSION Our present results indicate that COPD Japanese patients showing high CAT scores have a poor prognosis, and that the CAT score is able to predict exacerbation in Japanese COPD.
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Affiliation(s)
- Masashi Suetomo
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine, Kurume University School of Medicine, 67 Asahimachi, Kurume 830-0011, Japan; Respiratory Medicine, Chikugo City Hospital, 917-1 Izumi, Chikugo 833-0041, Japan.
| | - Tomotaka Kawayama
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine, Kurume University School of Medicine, 67 Asahimachi, Kurume 830-0011, Japan.
| | - Takashi Kinoshita
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine, Kurume University School of Medicine, 67 Asahimachi, Kurume 830-0011, Japan.
| | - Shinichi Takenaka
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine, Kurume University School of Medicine, 67 Asahimachi, Kurume 830-0011, Japan.
| | - Masanobu Matsuoka
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine, Kurume University School of Medicine, 67 Asahimachi, Kurume 830-0011, Japan.
| | - Kazuko Matsunaga
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine, Kurume University School of Medicine, 67 Asahimachi, Kurume 830-0011, Japan.
| | - Tomoaki Hoshino
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine, Kurume University School of Medicine, 67 Asahimachi, Kurume 830-0011, Japan.
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Takenaka SI, Kawayama T, Imaoka H, Sakazaki Y, Oda H, Kaku Y, Matsuoka M, Okamoto M, Kato S, Yamada K, Hoshino T. The progression of comorbidity in IL-18 transgenic chronic obstructive pulmonary disease mice model. Biochem Biophys Res Commun 2014; 445:597-601. [DOI: 10.1016/j.bbrc.2014.02.052] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2014] [Accepted: 02/11/2014] [Indexed: 01/30/2023]
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Kaku Y, Imaoka H, Morimatsu Y, Komohara Y, Ohnishi K, Oda H, Takenaka S, Matsuoka M, Kawayama T, Takeya M, Hoshino T. Overexpression of CD163, CD204 and CD206 on alveolar macrophages in the lungs of patients with severe chronic obstructive pulmonary disease. PLoS One 2014; 9:e87400. [PMID: 24498098 PMCID: PMC3907529 DOI: 10.1371/journal.pone.0087400] [Citation(s) in RCA: 109] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2013] [Accepted: 12/22/2013] [Indexed: 12/14/2022] Open
Abstract
We have previously reported that the lungs of patients with very severe chronic obstructive pulmonary disease (COPD) contain significantly higher numbers of alveolar macrophages than those of non-smokers or smokers. M1 and M2 macrophages represent pro- and anti-inflammatory populations, respectively. However, the roles of M1 and M2 alveolar macrophages in COPD remain unclear. Immunohistochemical techniques were used to examine CD163, CD204 and CD206, as M2 markers, expressed on alveolar macrophages in the lungs of patients with mild to very severe COPD (Global Initiative for Chronic Obstructive Lung Disease (GOLD) stage I (mild) n = 11, II (moderate) n = 9, III (severe) n = 2, and IV (very severe) n = 16). Fifteen smokers and 10 non-smokers were also examined for comparison. There were significantly higher numbers of alveolar macrophages in COPD patients than in smokers and non-smokers. The numbers and percentages of CD163(+), CD204(+) or CD206(+) alveolar macrophages in patients with COPD at GOLD stages III and IV were significantly higher than in those at GOLD stages I and II, and those in smokers and non-smokers. In patients with COPD, there was a significant negative correlation between the number of CD163(+), CD204(+) or CD206(+) alveolar macrophages and the predicted forced expiratory volume in one second. Overexpression of CD163, CD204 and CD206 on lung alveolar macrophages may be involved in the pathogenesis of COPD.
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MESH Headings
- Aged
- Antigens, CD/genetics
- Antigens, CD/metabolism
- Antigens, Differentiation, Myelomonocytic/genetics
- Antigens, Differentiation, Myelomonocytic/metabolism
- Female
- Humans
- Lectins, C-Type/genetics
- Lectins, C-Type/metabolism
- Lung/pathology
- Macrophages, Alveolar/metabolism
- Macrophages, Alveolar/pathology
- Male
- Mannose Receptor
- Mannose-Binding Lectins/genetics
- Mannose-Binding Lectins/metabolism
- Matrix Metalloproteinase 9/genetics
- Matrix Metalloproteinase 9/metabolism
- Middle Aged
- Pulmonary Alveoli/metabolism
- Pulmonary Alveoli/pathology
- Pulmonary Disease, Chronic Obstructive/genetics
- Pulmonary Disease, Chronic Obstructive/metabolism
- Pulmonary Disease, Chronic Obstructive/pathology
- Receptors, Cell Surface/genetics
- Receptors, Cell Surface/metabolism
- Scavenger Receptors, Class A/genetics
- Scavenger Receptors, Class A/metabolism
- Severity of Illness Index
- Smoking/genetics
- Smoking/metabolism
- Smoking/pathology
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Affiliation(s)
- Yoichiro Kaku
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine 1, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Haruki Imaoka
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine 1, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Yoshitaka Morimatsu
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine 1, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Yoshihiro Komohara
- Department of Cell Pathology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Koji Ohnishi
- Department of Cell Pathology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Hanako Oda
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine 1, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Shinichi Takenaka
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine 1, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Masanobu Matsuoka
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine 1, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Tomotaka Kawayama
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine 1, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Motohiro Takeya
- Department of Cell Pathology, Graduate School of Medical Sciences, Kumamoto University, Kumamoto, Japan
| | - Tomoaki Hoshino
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine 1, Kurume University School of Medicine, Kurume, Fukuoka, Japan
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Imaoka H, Takenaka SI, Kawayama T, Oda H, Kaku Y, Matsuoka M, Sakazaki Y, O'Byrne PM, Hoshino T. Increased serum levels of soluble IL-18 receptor complex in patients with allergic asthma. Allergol Int 2013; 62:513-515. [PMID: 23963474 DOI: 10.2332/allergolint.13-le-0548] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Affiliation(s)
- Haruki Imaoka
- Division of Respirology, Neurology, and Rheumatology, The First Department of Medicine, Kurume University School of Medicine, Fukuoka, Japan
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Sawada M, Kawayama T, Imaoka H, Sakazaki Y, Oda H, Takenaka SI, Kaku Y, Azuma K, Tajiri M, Edakuni N, Okamoto M, Kato S, Hoshino T. IL-18 induces airway hyperresponsiveness and pulmonary inflammation via CD4+ T cell and IL-13. PLoS One 2013; 8:e54623. [PMID: 23382928 PMCID: PMC3558507 DOI: 10.1371/journal.pone.0054623] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2012] [Accepted: 12/13/2012] [Indexed: 11/19/2022] Open
Abstract
IL-18 plays a key role in the pathogenesis of pulmonary inflammatory diseases including pulmonary infection, pulmonary fibrosis, lung injury and chronic obstructive pulmonary disease (COPD). However, it is unknown whether IL-18 plays any role in the pathogenesis of asthma. We hypothesized that overexpression of mature IL-18 protein in the lungs may exacerbate disease activities of asthma. We established lung-specific IL-18 transgenic mice on a Balb/c genetic background. Female mice sensitized– and challenged– with antigen (ovalbumin) were used as a mouse asthma model. Pulmonary inflammation and emphysema were not observed in the lungs of naïve transgenic mice. However, airway hyperresponsiveness and airway inflammatory cells accompanied with CD4+ T cells, CD8+ T cells, eosinophils, neutrophils, and macrophages were significantly increased in ovalbumin-sensitized and challenged transgenic mice, as compared to wild type Balb/c mice. We also demonstrate that IL-18 induces IFN-γ, IL-13, and eotaxin in the lungs of ovalbumin-sensitized and challenged transgenic mice along with an increase in IL-13 producing CD4+ T cells. Treatment with anti-CD4 monoclonal antibody or deletion of the IL-13 gene improves ovalbumin-induced airway hyperresponsiveness and reduces airway inflammatory cells in transgenic mice. Overexpressing the IL-18 protein in the lungs induces type 1 and type 2 cytokines and airway inflammation, and results in increasing airway hyperresponsiveness via CD4+ T cells and IL-13 in asthma.
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Affiliation(s)
- Masanori Sawada
- Division of Respirology, Neurology and Rheumatology, Department of Medicine 1, Kurume University School of Medicine, Fukuoka, Japan
| | - Tomotaka Kawayama
- Division of Respirology, Neurology and Rheumatology, Department of Medicine 1, Kurume University School of Medicine, Fukuoka, Japan
| | - Haruki Imaoka
- Division of Respirology, Neurology and Rheumatology, Department of Medicine 1, Kurume University School of Medicine, Fukuoka, Japan
| | - Yuki Sakazaki
- Division of Respirology, Neurology and Rheumatology, Department of Medicine 1, Kurume University School of Medicine, Fukuoka, Japan
| | - Hanako Oda
- Division of Respirology, Neurology and Rheumatology, Department of Medicine 1, Kurume University School of Medicine, Fukuoka, Japan
| | - Shin-ichi Takenaka
- Division of Respirology, Neurology and Rheumatology, Department of Medicine 1, Kurume University School of Medicine, Fukuoka, Japan
| | - Yoichiro Kaku
- Division of Respirology, Neurology and Rheumatology, Department of Medicine 1, Kurume University School of Medicine, Fukuoka, Japan
| | - Koichi Azuma
- Division of Respirology, Neurology and Rheumatology, Department of Medicine 1, Kurume University School of Medicine, Fukuoka, Japan
| | - Morihiro Tajiri
- Division of Respirology, Neurology and Rheumatology, Department of Medicine 1, Kurume University School of Medicine, Fukuoka, Japan
| | - Nobutaka Edakuni
- Division of Respirology, Neurology and Rheumatology, Department of Medicine 1, Kurume University School of Medicine, Fukuoka, Japan
| | - Masaki Okamoto
- Division of Respirology, Neurology and Rheumatology, Department of Medicine 1, Kurume University School of Medicine, Fukuoka, Japan
| | - Seiya Kato
- Division of Pathology and Cell Biology, Graduate School and Faculty of Medicine, University of the Ryukyus, Okinawa, Japan
| | - Tomoaki Hoshino
- Division of Respirology, Neurology and Rheumatology, Department of Medicine 1, Kurume University School of Medicine, Fukuoka, Japan
- * E-mail:
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Sakazaki Y, Hoshino T, Takei S, Sawada M, Oda H, Takenaka SI, Imaoka H, Matsunaga K, Ota T, Abe Y, Miki I, Fujimoto K, Kawayama T, Kato S, Aizawa H. Overexpression of chitinase 3-like 1/YKL-40 in lung-specific IL-18-transgenic mice, smokers and COPD. PLoS One 2011; 6:e24177. [PMID: 21915293 PMCID: PMC3168485 DOI: 10.1371/journal.pone.0024177] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2011] [Accepted: 08/02/2011] [Indexed: 11/19/2022] Open
Abstract
We analyzed the lung mRNA expression profiles of a murine model of COPD developed using a lung-specific IL-18-transgenic mouse. In this transgenic mouse, the expression of 608 genes was found to vary more than 2-fold in comparison with control WT mice, and was clustered into 4 groups. The expression of 140 genes was constitutively increased at all ages, 215 genes increased gradually with aging, 171 genes decreased gradually with aging, and 82 genes decreased temporarily at 9 weeks of age. Interestingly, the levels of mRNA for the chitinase-related genes chitinase 3-like 1 (Chi3l1), Chi3l3, and acidic mammalian chitinase (AMCase) were significantly higher in the lungs of transgenic mice than in control mice. The level of Chi3l1 protein increased significantly with aging in the lungs and sera of IL-18 transgenic, but not WT mice. Previous studies have suggested Chi3l3 and AMCase are IL-13-driven chitinase-like proteins. However, IL-13 gene deletion did not reduce the level of Chi3l1 protein in the lungs of IL-18 transgenic mice. Based on our murine model gene expression data, we analyzed the protein level of YKL-40, the human homolog of Chi3l1, in sera of smokers and COPD patients. Sixteen COPD patients had undergone high resolution computed tomography (HRCT) examination. Emphysema was assessed by using a density mask with a cutoff of -950 Hounsfield units to calculate the low-attenuation area percentage (LAA%). We observed significantly higher serum levels in samples from 28 smokers and 45 COPD patients compared to 30 non-smokers. In COPD patients, there was a significant negative correlation between serum level of YKL-40 and %FEV(1). Moreover, there was a significant positive correlation between the serum levels of YKL-40 and LAA% in COPD patients. Thus our results suggest that chitinase-related genes may play an important role in establishing pulmonary inflammation and emphysematous changes in smokers and COPD patients.
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Affiliation(s)
- Yuki Sakazaki
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Tomoaki Hoshino
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Satoko Takei
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Masanori Sawada
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Hanako Oda
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Shin-ichi Takenaka
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Haruki Imaoka
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Kazuko Matsunaga
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Toshio Ota
- Drug Discovery Research Laboratories, Kyowa Hakko Kirin Co., Ltd., Shizuoka, Japan
| | - Yuzuru Abe
- Drug Discovery Research Laboratories, Kyowa Hakko Kirin Co., Ltd., Shizuoka, Japan
| | - Ichiro Miki
- Drug Discovery Research Laboratories, Kyowa Hakko Kirin Co., Ltd., Shizuoka, Japan
| | - Kiminori Fujimoto
- Department of Radiology and Center for Diagnostic Imaging, Department of Medicine, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Tomotaka Kawayama
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine, Kurume University School of Medicine, Kurume, Fukuoka, Japan
| | - Seiya Kato
- Division of Pathology and Cell Biology, Graduate School and Faculty of Medicine, University of the Ryukyus, Nishihara, Okinawa, Japan
| | - Hisamichi Aizawa
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine, Kurume University School of Medicine, Kurume, Fukuoka, Japan
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Takei S, Hoshino T, Matsunaga K, Sakazaki Y, Sawada M, Oda H, Takenaka SI, Imaoka H, Kinoshita T, Honda S, Ida H, Fukuda TA, Aizawa H. Soluble interleukin-18 receptor complex is a novel biomarker in rheumatoid arthritis. Arthritis Res Ther 2011; 13:R52. [PMID: 21435242 PMCID: PMC3132041 DOI: 10.1186/ar3295] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2010] [Revised: 02/23/2011] [Accepted: 03/24/2011] [Indexed: 12/25/2022] Open
Abstract
Introduction There has been no report in the literature of a soluble form of interleukin (IL)-18 receptor α (IL-18Rα). In this study, we evaluated the levels and characteristics of soluble IL-18Rα (sIL-18Rα) in the sera of patients with rheumatoid arthritis (RA) and compared these results to control populations. Methods The sIL-18Rα complex was isolated from pooled human blood serum using an anti-IL-18Rα monoclonal antibody affinity column. The purified sIL-18Rα was then examined using Western blot analysis and used in experiments to evaluate the effects on an IL-18-responsive natural killer (NK) human cell line, NK0. An enzyme-linked immunosorbent assay was developed, and sera from 145 patients with RA, 6 patients with adult-onset Still's disease, 31 patients with osteoarthritis (OA), 39 patients with systemic lupus erythematosus (SLE) and 67 controls were tested, along with levels of immunoglobulin M, rheumatoid factor, anticyclic citrullinated peptide antibody, IL-18, IL-13 and interferon (IFN)-γ. Area under the receiver operating characteristic curve (ROC-AUC) analysis was used to evaluate the diagnostic utility of the sIL-18Rα complex. Results The isolated sIL-18Rα complex can be associated with IL-18 and the soluble form of the IL-18Rβ chain. The sIL-18Rα complex bound to the surface to the NK0 cell line, antagonized the stimulatory effects of IL-18 and IL-2 on the NK0 cell line and inhibited IFN-γ production by the cells. The serum levels of sIL-18Rα complex in RA (186.0 ± 33.5 ng/mL, n = 145) and adult-onset Still's disease (98.2 ± 8.9 ng/mL, n = 6) were significantly (P < 0.001) higher than those in the healthy controls (52.3 ± 8.5 ng/mL, n = 67), OA (38.6 ± 5.4 ng/mL, n = 31), SLE (44.6 ± 3.2 ng/mL, n = 39). The serum level of sIL-18Rα complex was not significantly different between RA and adult-onset Still's disease patients. The serum levels of IL-18, IL-13 and IFN-γ in the RA patients were significantly (P < 0.01) higher than in OA and SLE patients as well as healthy controls. ROC-AUC analysis of the serum concentration of sIL-18Rα indicated that it was significantly diagnostic of RA. Moreover, a tumor necrosis factor inhibitor, etanercept, significantly (P < 0.0001) decreased levels of sIL-18Rα in the sera of 29 RA patients 6 months after treatment. Conclusions The sIL-18Rα complex could be a potentially useful biomarker for the diagnosis of RA.
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Affiliation(s)
- Satoko Takei
- Division of Respirology, Neurology, and Rheumatology, Department of Medicine, Kurume University School of Medicine, 67 Asahi-machi, Kurume, Fukuoka 830-0011, Japan
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