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Center for Experimental Medicine, Institute of Medical Science, University of Tokyo, Tokyo, Japan
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Abstract |
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Introduction |
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TopAbstractIntroductionMaterials and MethodsResultsDiscussionReferences |
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1% of all people worldwide, irrespective of race. The disease is autoimmune in nature and characterized by chronic inflammation of the synovial tissues in multiple joints that leads to joint destruction, but the etiopathogenesis has not been elucidated completely (1). Various disease models for RA have been developed, and collagen-induced arthritis (CIA) is one of the well-established models (2). CIA can be induced in susceptible rodents by intradermal injections of homologous or heterologous native type II collagen (IIC), a major component of cartilage Ags. Susceptibility for the disease is dependent on MHC class II haplotypes, and only mice with H-2q and H-2r haplotypes respond to immunization with IIC and develop arthritis (3). Recently, however, it is reported that CIA can also be induced on C57BL/6 (H-2b) mice by repeated administration with IIC intradermally (4, 5, 6). The development of CIA is dependent on both cellular and humoral immune responses to IIC (6), and various cytokines are thought to play crucial roles in the pathogenesis through the activation of immune system (6, 7).
A T cell-derived proinflammatory cytokine, IL-17 is produced by TCR
/
+CD4-CD8- thymocytes, as well as activated CD4+ and CD4+CD45RO+ memory T cells (8). The producer cells of IL-17 also express TNF-, but not Th1 or Th2 cytokines, in mice (9). IL-17 has pleiotropic activities, including induction of TNF-, IL-1, IL-6, IL-8, G-CSF, and monocyte chemoattractant protein-1 on various types of cells (8).
Involvement of IL-17 in the development of RA is suggested, because IL-17 is found in the synovial fluid of RA patients (10) and is produced by T cell clones established from RA patients (11). Actually, the incidence of arthritis reduced partially by the administration of an extracellular domain of IL-17R-Fc fusion protein (IL-17R:Fc), which inhibits IL-17-IL-17R binding, in the elicitation phase during CIA (12). The precise role for IL-17 in the pathogenesis of RA, however, still remains to be elucidated.
In this study, using IL-17-/- mice, we assessed the role of IL-17 in the development of CIA. The incidence of CIA was markedly suppressed in IL-17-/- mice, and a crucial role for IL-17 was suggested in activating collagen-specific T and B cells during CIA.
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Materials and Methods |
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IL-17-/- mice were generated, as described previously, using E14.1 ES cells (13). For CIA induction, IL-17-/- mice on (129/Sv x C57BL/B6)F1 hybrid background were used, and the IL-17+/+ littermates were used as the controls. These mice were kept under specific pathogen-free conditions in an environmentally controlled clean room in the Center for Experimental Medicine, Institute of Medical Science, University of Tokyo. The experiments were conducted according to the institutional ethical guidelines for animal experiments and the safety guideline for gene manipulation experiments.
Collagen-induced arthritis
CIA in mice on 129 x B6 F1 hybrid background was performed, as described elsewhere (5). Briefly, mice were immunized with 100 µl of 1 mg/ml chicken IIC (Sigma-Aldrich, St. Louis, MO) emulsified with CFA intradermally at several sites into the base of the tail. CFA was prepared by the mixture of 100 mg heat-killed Mycobacterium tuberculosis (H37Ra; Difco Laboratories, Detroit, MI) and 20 ml IFA (Difco). At 21 days after the first immunization, mice were again challenged with collagen/CFA nearby the primary injection site intradermally.
Clinical and histological assessment of arthritis
Development of arthritis by macroscopic evaluation was determined, as described elsewhere (14). At 60 days after the first immunization during CIA, limbs were fixed with 10% neutral Formalin and were decalcified with 5% formic acid. They were embedded in paraffin, and 5-µm slices were prepared. Sections were stained with H&E.
T cell culture
For IIC-specific T cell proliferative response, inguinal lymph nodes (LNs) were harvested from mice at 1 wk after the primary immunization with IIC/CFA. Single cell suspension was prepared, and LN cells (3 x 105 cells/well on 96-well flat-bottom plate) were cultured in the absence or presence of 50 µg/ml denatured chicken IIC for 72 h, followed by incorporation of [3H]thymidine (0.25 µCi/ml) (Amersham, Chalfont St. Giles, Buckinghamshire, U.K.) for 6 h. Then cells were harvested with a Micro 96 cell harvester (Skatron, Lier, Norway), and radioactivity was measured with Micro Beta (Pharmacia Biotech, Piscataway, NJ).
Detection of cytokine by ELISA
IL-17 levels were measured by ELISA, as described previously (13). Monoclonal rat anti-mouse IL-17 and polyclonal biotinylated goat anti-mouse IL-17 Abs (DAKO, Carpenteria, CA) were used as a capture and detection Ab, respectively. HRP-avidin was obtained from BD PharMingen (San Diego, CA), and a tetramethylbenzidine One-Step Substrate System was obtained from DAKO. rIL-17 as a standard reagent was obtained from Sigma-Aldrich. To measure IL-4 and IFN-
levels, BD OptiEIA ELISA Sets were purchased from BD PharMingen.
Measurement of collagen-specific Ig titers
Sixty days after the first and second immunizations with IIC/CFA, serum was collected. A total of 10 µg/ml IIC in PBS was coated on Falcon 3912 Micro Test III Flexible Assay Plates (BD Biosciences, Oxnard, CA) at 4°C overnight. After washing with PBS, serially diluted serum samples were applied and incubated at room temperature for 1 h. Then the wells were washed with PBS + 0.05% Tween 20, followed by the addition of alkaline phosphatase-conjugated goat anti-mouse IgG1, IgG2a, IgG2b, and IgG3 (Zymed, San Francisco, CA). Alkaline phosphatase activity was measured using Substrate Phosphatase SIGMA104 (Sigma-Aldrich) as the substrate. Results are expressed by the absorbancy at 415 nm.
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Results |
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To assess the role of IL-17 in the development of arthritis, the effect of IL-17 deficiency on the development of CIA was examined. As shown in Fig. 1A, the incidence of the disease in IL-17-/- mice was markedly suppressed compared with that in IL-17+/+ mice. Likewise, the severity score in IL-17-/- mice was also milder than that in IL-17+/+ mice (Fig. 1B). A histological analysis of the joints of IL-17+/+ mice immunized with IIC showed typical features of arthritis, which was characterized by marked synovial and periarticular inflammation with extensive polymorphonuclear cell infiltration, synovial hyperplasia, and bone erosion (Fig. 2, C and E). The articular bone and cartilage were invaded with granulation tissues forming a pannus, and degenerative products of the bone structure were found in the articular cavity. In contrast, the joint pathology of IL-17-/- mice revealed much milder inflammation with profoundly reduced cell infiltration, and synovial hyperplasia and bone erosion were also suppressed, indicating both inflammatory and destructive features of the joints were suppressed in IL-17-/- mice (Fig. 2, D and F). These results indicate that IL-17 is involved in the development of CIA.
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Because Ab levels against IIC correlate well with the development of arthritis (15), we examined the development of IIC-specific Abs in IL-17-/- mice. Sera were collected 60 days after the first immunization with chicken IIC/CFA, and IIC-specific Ab levels were measured by ELISA. Collagen-specific IgG2a levels in sera from IL-17-/- mice were significantly lower than those from IL-17+/+ mice, whereas the levels of other IgG subclass Abs were not different between IL-17+/+ and IL-17-/- mice (Fig. 3). These results indicate that IL-17 is involved in collagen-specific Ab production during CIA.
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To elucidate the role of IL-17 in T cell function, we examined T cell response in IL-17-/- mice. A T cell Ag-recalling assay against IIC was conducted 1 wk after the first immunization with chicken IIC/CFA. Proliferative response against IIC of LN cells from IL-17-/- mice was significantly reduced compared with that from IL-17+/+ mice (Fig. 4A), showing that IL-17-deficient T cells are sensitized incompletely. During the incubation, a significant amount of IL-17 was secreted in the supernatants of IL-17+/+ LN cell cultures, but no production was detected in IL-17-/- LN cell cultures (Fig. 4B). IFN- production after stimulation with IIC was markedly reduced in IL-17-/- LN cell culture, while IL-4 production was almost undetectable both in the IL-17+/+ LN cell culture and IL-17-/- T cell culture (Fig. 4B). These results indicate that IL-17 plays an important role in the Ag-specific T cell activation during priming phase of CIA.
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Discussion |
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, a major Th1 cytokine, has been considered to play rather beneficial roles (16, 17, 18). In contrast, inflammatory cytokines, TNF- and GM-CSF, which are also produced by CD4+ T cells (9), are suggested to have an important role in the RA pathogenesis. Indeed, the development of CIA in TNF--/- mice (C57BL/6 background) was milder than that of wild-type mice, and markedly suppressed in GM-CSF-/- mice (backcrossed to C57BL/6 for 11 generations) (6). Because both TNF- and GM-CSF are produced by various cell types including fibroblasts, the suppressive effect of CIA may not solely be a result of their production by CD4+ T cells. However, in a recent study, it was reported that IL-17 is produced by CD4+ T cells that are coexpressing TNF- and/or GM-CSF, but not by Th1 and Th2 cells (9). Thus, a certain T cell subset, coexpressing IL-17, TNF-, and/or GM-CSF rather than Th1-producing IFN-, may have an important role in the pathogenesis of RA. Although it was believed that contact hypersensitivity response (CHS) is mediated by IFN--producing Tc1 and Th1 cells (19), we showed that CHS was normal in IFN--/- mice (20), while it was markedly suppressed in IL-17-/- mice (13), indicating that CHS as well as CIA are mediated by CD4+ T cells producing IL-17, but not IFN-. Moreover, experimental autoimmune encephalomyelitis (EAE) is also considered to be an IFN--producing Th1 cell-mediated inflammatory autoimmune disease. However, many investigators have shown that IFN--/- and IFN-R-/- mice are highly susceptible to EAE compared with control mice, indicating that IFN--producing Th1 cells are required for the protection of this disease (21, 22, 23, 24). In contrast, IL-17 mRNA was increased in multiple sclerosis, suggesting that IL-17 is involved in the pathogenesis of multiple sclerosis (25, 26). In fact, in our unpublished observation, EAE in IL-17-/- mice was significantly suppressed (Y. Komiyama, S. Nakae, and Y. Iwakura, in preparation). Thus, IL-17-producing T cells rather than IFN--producing Th1 cells play critical roles in the pathogenesis of T cell-dependent autoimmune disease. Recently, it was reported that the administration of IL-17R:Fc fusion protein to DBA/1 mice after secondary immunization with IIC/CFA suppresses the disease by blocking the IL-17/IL-17R binding, suggesting that IL-17 plays an important role in the inflammatory phase (12). In the present study, we have shown that IL-17 is involved in autoantigen-specific T cell priming and expansion (Fig. 4), although the roles of IL-17 in the inflammatory phase are not known in this experiment. Taken together, these observations indicate that IL-17 plays important roles not only in the induction of local inflammation of joints, but also in autoantigen-specific T cell activation in the priming phase.
As mentioned above, IL-17 is required for autoantigen- and allergen-specific T cell priming and Ab production (Figs. 3 and 4) (13). Yao et al. (27) also reported that T cell proliferation and IL-2 production induced by PHA, Con A, and anti-TCR mAb were inhibited by soluble IL-17R, indicating that IL-17 is involved in T cell activation. To elucidate the molecular mechanism of T cell activation, we analyzed compartmentalization of T cell subset in lymphoid tissues and DC functions in IL-17-/- mice, and found they are normal (13). Microarchitecture and germinal center formation of the spleen and LNs were also normal in IL-17-/- mice before and after IIC immunization (data not shown). Thus, the precise molecular mechanism of T cell activation by IL-17 still remains to be elucidated.
It was reported that C57BL/6 mice produce IgG2c instead of IgG2a, while 129/Sv mice produce IgG2a (5, 28). Although it was suggested that collagen-specific IgG2a contributes to the development of CIA (29), C57BL/6 mice and (C57BL/6 x 129/Sv)F1 mice, but not 129/Sv mice, developed CIA under our experimental conditions (5). Thus, IgGs other than IgG2a might also contribute to the development of arthritis.
We showed that collagen-specific IgG2a levels in sera of collagen-immunized IL-17-/- mice were significantly reduced compared with those of wild-type mice (Fig. 3). However, because secondary anti-IgG2a Ab that we used may cross-react with IgG2c, although the efficiency for IgG2c should be much reduced (28), the IgG2a fraction may contain a small fraction of IgG2c in addition to IgG2a.
In summary, IL-17 plays a critical role in the development of CIA. These findings may provide a clue to develop novel therapeutics.
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Acknowledgments |
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Footnotes |
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2 Current address: Department of Pathology, Stanford University School of Medicine, 269 Campus Drive CCSR 3255, Stanford, CA 94305-5176.
3 Address correspondence and reprint requests to Dr. Yoichiro Iwakura, Center for Experimental Medicine, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Minato-ku, Tokyo 108-8639, Japan. E-mail address: iwakura{at}ims.u-tokyo.ac.jp
4 Abbreviations used in this paper: RA, rheumatoid arthritis; CHS, contact hypersensitivity response; CIA, collagen-induced arthritis; EAE, experimental autoimmune encephalomyelitis; IIC, type II collagen; LN, lymph node.
Received for publication February 13, 2003. Accepted for publication September 26, 2003.
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References |
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J. Lee, E. K. Reinke, A. L. Zozulya, M. Sandor, and Z. Fabry Mycobacterium bovis Bacille Calmette-Guerin Infection in the CNS Suppresses Experimental Autoimmune Encephalomyelitis and Th17 Responses in an IFN-{gamma}-Independent Manner J. Immunol., November 1, 2008; 181(9): 6201 - 6212. [Abstract] [Full Text] [PDF]
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 K. Koyama, H. Kagamu, S. Miura, T. Hiura, T. Miyabayashi, R. Itoh, H. Kuriyama, H. Tanaka, J. Tanaka, H. Yoshizawa, et al. Reciprocal CD4+ T-Cell Balance of Effector CD62Llow CD4+ and CD62LhighCD25+ CD4+ Regulatory T Cells in Small Cell Lung Cancer Reflects Disease Stage Clin. Cancer Res., November 1, 2008; 14(21): 6770 - 6779. [Abstract] [Full Text] [PDF]
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 A. Webb, A. Johnson, M. Fortunato, A. Platt, T. Crabbe, M. I. Christie, G. F. Watt, S. G. Ward, and L. A. Jopling Evidence for PI-3K-dependent migration of Th17-polarized cells in response to CCR2 and CCR6 agonists J. Leukoc. Biol., October 1, 2008; 84(4): 1202 - 1212. [Abstract] [Full Text] [PDF]
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A. G. Rowan, J. M. Fletcher, E. J. Ryan, B. Moran, J. E. Hegarty, C. O'Farrelly, and K. H. G. Mills Hepatitis C Virus-Specific Th17 Cells Are Suppressed by Virus-Induced TGF-{beta} J. Immunol., October 1, 2008; 181(7): 4485 - 4494. [Abstract] [Full Text] [PDF]
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F. Al-Salleeh and T. M. Petro Promoter Analysis Reveals Critical Roles for SMAD-3 and ATF-2 in Expression of IL-23 p19 in Macrophages J. Immunol., October 1, 2008; 181(7): 4523 - 4533. [Abstract] [Full Text] [PDF]
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W Niedbala, B Cai, X Wei, A Patakas, B P Leung, I B McInnes, and F Y Liew Interleukin 27 attenuates collagen-induced arthritis Ann Rheum Dis, October 1, 2008; 67(10): 1474 - 1479. [Abstract] [Full Text] [PDF]
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K. M. Dhodapkar, S. Barbuto, P. Matthews, A. Kukreja, A. Mazumder, D. Vesole, S. Jagannath, and M. V. Dhodapkar Dendritic cells mediate the induction of polyfunctional human IL17-producing cells (Th17-1 cells) enriched in the bone marrow of patients with myeloma Blood, October 1, 2008; 112(7): 2878 - 2885. [Abstract] [Full Text] [PDF]
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Q. Lai Kwan Lam, O. King Hung Ko, B.-J. Zheng, and L. Lu Local BAFF gene silencing suppresses Th17-cell generation and ameliorates autoimmune arthritis PNAS, September 30, 2008; 105(39): 14993 - 14998. [Abstract] [Full Text] [PDF]
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 I. Sonderegger, G. Iezzi, R. Maier, N. Schmitz, M. Kurrer, and M. Kopf GM-CSF mediates autoimmunity by enhancing IL-6-dependent Th17 cell development and survival J. Exp. Med., September 29, 2008; 205(10): 2281 - 2294. [Abstract] [Full Text] [PDF]
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H Yamada, Y Nakashima, K Okazaki, T Mawatari, J-I Fukushi, N Kaibara, A Hori, Y Iwamoto, and Y Yoshikai Th1 but not Th17 cells predominate in the joints of patients with rheumatoid arthritis Ann Rheum Dis, September 1, 2008; 67(9): 1299 - 1304. [Abstract] [Full Text] [PDF]
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I. Kochetkova, T. Trunkle, G. Callis, and D. W. Pascual Vaccination without Autoantigen Protects against Collagen II-Induced Arthritis via Immune Deviation and Regulatory T Cells J. Immunol., August 15, 2008; 181(4): 2741 - 2752. [Abstract] [Full Text] [PDF]
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J. F. Wright, F. Bennett, B. Li, J. Brooks, D. P. Luxenberg, M. J. Whitters, K. N. Tomkinson, L. J. Fitz, N. M. Wolfman, M. Collins, et al. The Human IL-17F/IL-17A Heterodimeric Cytokine Signals through the IL-17RA/IL-17RC Receptor Complex J. Immunol., August 15, 2008; 181(4): 2799 - 2805. [Abstract] [Full Text] [PDF]
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D. Xu, H.-R. Jiang, P. Kewin, Y. Li, R. Mu, A. R. Fraser, N. Pitman, M. Kurowska-Stolarska, A. N. J. McKenzie, I. B. McInnes, et al. IL-33 exacerbates antigen-induced arthritis by activating mast cells PNAS, August 5, 2008; 105(31): 10913 - 10918. [Abstract] [Full Text] [PDF]
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N. Takahashi, I. Vanlaere, R. de Rycke, A. Cauwels, L. A.B Joosten, E. Lubberts, W. B. van den Berg, and C. Libert IL-17 produced by Paneth cells drives TNF-induced shock J. Exp. Med., August 4, 2008; 205(8): 1755 - 1761. [Abstract] [Full Text] [PDF]
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E. Smith, M. A. Stark, A. Zarbock, T. L. Burcin, A. C. Bruce, D. Vaswani, P. Foley, and K. Ley IL-17A Inhibits the Expansion of IL-17A-Producing T Cells in Mice through "Short-Loop" Inhibition via IL-17 Receptor J. Immunol., July 15, 2008; 181(2): 1357 - 1364. [Abstract] [Full Text] [PDF]
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Y. Zhang, G. Xu, L. Zhang, A. I. Roberts, and Y. Shi Th17 Cells Undergo Fas-Mediated Activation-Induced Cell Death Independent of IFN-{gamma} J. Immunol., July 1, 2008; 181(1): 190 - 196. [Abstract] [Full Text] [PDF]
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P. D. Doodes, Y. Cao, K. M. Hamel, Y. Wang, B. Farkas, Y. Iwakura, and A. Finnegan Development of Proteoglycan-Induced Arthritis Is Independent of IL-17 J. Immunol., July 1, 2008; 181(1): 329 - 337. [Abstract] [Full Text] [PDF]
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T. Khayrullina, J.-H. Yen, H. Jing, and D. Ganea In Vitro Differentiation of Dendritic Cells in the Presence of Prostaglandin E2 Alters the IL-12/IL-23 Balance and Promotes Differentiation of Th17 Cells J. Immunol., July 1, 2008; 181(1): 721 - 735. [Abstract] [Full Text] [PDF]
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C. A. Cox, G. Shi, H. Yin, B. P. Vistica, E. F. Wawrousek, C.-C. Chan, and I. Gery Both Th1 and Th17 Are Immunopathogenic but Differ in Other Key Biological Activities J. Immunol., June 1, 2008; 180(11): 7414 - 7422. [Abstract] [Full Text] [PDF]
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V. Paunovic, H. P. Carroll, K. Vandenbroeck, and M. Gadina Signalling, inflammation and arthritis: Crossed signals: the role of interleukin (IL)-12, -17, -23 and -27 in autoimmunity Rheumatology, June 1, 2008; 47(6): 771 - 776. [Abstract] [Full Text] [PDF]
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X. O. Yang, S. H. Chang, H. Park, R. Nurieva, B. Shah, L. Acero, Y.-H. Wang, K. S. Schluns, R. R. Broaddus, Z. Zhu, et al. Regulation of inflammatory responses by IL-17F J. Exp. Med., May 12, 2008; 205(5): 1063 - 1075. [Abstract] [Full Text] [PDF]
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L. I. Rutitzky, L. Bazzone, M. G. Shainheit, B. Joyce-Shaikh, D. J. Cua, and M. J. Stadecker IL-23 Is Required for the Development of Severe Egg-Induced Immunopathology in Schistosomiasis and for Lesional Expression of IL-17 J. Immunol., February 15, 2008; 180(4): 2486 - 2495. [Abstract] [Full Text] [PDF]
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 T. Kokubu, D. R. Haudenschild, T. A. Moseley, L. Rose, and A. H. Reddi Immunolocalization of IL-17A, IL-17B, and Their Receptors in Chondrocytes During Fracture Healing J. Histochem. Cytochem., February 1, 2008; 56(2): 89 - 95. [Abstract] [Full Text] [PDF]
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T. Yoshimura, K.-H. Sonoda, Y. Miyazaki, Y. Iwakura, T. Ishibashi, A. Yoshimura, and H. Yoshida Differential roles for IFN-{gamma} and IL-17 in experimental autoimmune uveoretinitis Int. Immunol., February 1, 2008; 20(2): 209 - 214. [Abstract] [Full Text] [PDF]
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K. S. Weber, M. J. Miller, and P. M. Allen Th17 Cells Exhibit a Distinct Calcium Profile from Th1 and Th2 Cells and Have Th1-Like Motility and NF-AT Nuclear Localization J. Immunol., February 1, 2008; 180(3): 1442 - 1450. [Abstract] [Full Text] [PDF]
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T. J. Scriba, B. Kalsdorf, D.-A. Abrahams, F. Isaacs, J. Hofmeister, G. Black, H. Y. Hassan, R. J. Wilkinson, G. Walzl, S. J. Gelderbloem, et al. Distinct, Specific IL-17- and IL-22-Producing CD4+ T Cell Subsets Contribute to the Human Anti-Mycobacterial Immune Response J. Immunol., February 1, 2008; 180(3): 1962 - 1970. [Abstract] [Full Text] [PDF]
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Y. Cao, P. D. Doodes, T. T. Glant, and A. Finnegan IL-27 Induces a Th1 Immune Response and Susceptibility to Experimental Arthritis J. Immunol., January 15, 2008; 180(2): 922 - 930. [Abstract] [Full Text] [PDF]
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H. W. Lim, J. Lee, P. Hillsamer, and C. H. Kim Human Th17 Cells Share Major Trafficking Receptors with Both Polarized Effector T Cells and FOXP3+ Regulatory T Cells J. Immunol., January 1, 2008; 180(1): 122 - 129. [Abstract] [Full Text] [PDF]
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S. Zrioual, M.-L. Toh, A. Tournadre, Y. Zhou, M.-A. Cazalis, A. Pachot, V. Miossec, and P. Miossec IL-17RA and IL-17RC Receptors Are Essential for IL-17A-Induced ELR+ CXC Chemokine Expression in Synoviocytes and Are Overexpressed in Rheumatoid Blood J. Immunol., January 1, 2008; 180(1): 655 - 663. [Abstract] [Full Text] [PDF]
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 J. S. Tzartos, M. A. Friese, M. J. Craner, J. Palace, J. Newcombe, M. M. Esiri, and L. Fugger Interleukin-17 Production in Central Nervous System-Infiltrating T Cells and Glial Cells Is Associated with Active Disease in Multiple Sclerosis Am. J. Pathol., January 1, 2008; 172(1): 146 - 155. [Abstract] [Full Text] [PDF]
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L. C. Zaba, I. Cardinale, P. Gilleaudeau, M. Sullivan-Whalen, M. Suarez-Farinas, J. Fuentes-Duculan, I. Novitskaya, A. Khatcherian, M. J. Bluth, M. A. Lowes, et al. Amelioration of epidermal hyperplasia by TNF inhibition is associated with reduced Th17 responses J. Exp. Med., December 24, 2007; 204(13): 3183 - 3194. [Abstract] [Full Text] [PDF]
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D. Noguchi, D. Wakita, M. Tajima, S. Ashino, Y. Iwakura, Y. Zhang, K. Chamoto, H. Kitamura, and T. Nishimura Blocking of IL-6 signaling pathway prevents CD4+ T cell-mediated colitis in a Th17-independent manner Int. Immunol., December 1, 2007; 19(12): 1431 - 1440. [Abstract] [Full Text] [PDF]
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X. Chen, S. Vodanovic-Jankovic, B. Johnson, M. Keller, R. Komorowski, and W. R. Drobyski Absence of regulatory T-cell control of TH1 and TH17 cells is responsible for the autoimmune-mediated pathology in chronic graft-versus-host disease Blood, November 15, 2007; 110(10): 3804 - 3813. [Abstract] [Full Text] [PDF]
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A. Habicht, S. Dada, M. Jurewicz, B. T. Fife, H. Yagita, M. Azuma, M. H. Sayegh, and I. Guleria A Link between PDL1 and T Regulatory Cells in Fetomaternal Tolerance J. Immunol., October 15, 2007; 179(8): 5211 - 5219. [Abstract] [Full Text] [PDF]
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C. L. Roark, J. D. French, M. A. Taylor, A. M. Bendele, W. K. Born, and R. L. O'Brien Exacerbation of Collagen-Induced Arthritis by Oligoclonal, IL-17-Producing {gamma}{delta} T Cells J. Immunol., October 15, 2007; 179(8): 5576 - 5583. [Abstract] [Full Text] [PDF]
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S. Kohyama, S. Ohno, A. Isoda, O. Moriya, M. L. Belladonna, H. Hayashi, Y. Iwakura, T. Yoshimoto, T. Akatsuka, and M. Matsui IL-23 Enhances Host Defense against Vaccinia Virus Infection Via a Mechanism Partly Involving IL-17 J. Immunol., September 15, 2007; 179(6): 3917 - 3925. [Abstract] [Full Text] [PDF]
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D. C. Fitzgerald, B. Ciric, T. Touil, H. Harle, J. Grammatikopolou, J. D. Sarma, B. Gran, G.-X. Zhang, and A. Rostami Suppressive Effect of IL-27 on Encephalitogenic Th17 Cells and the Effector Phase of Experimental Autoimmune Encephalomyelitis J. Immunol., September 1, 2007; 179(5): 3268 - 3275. [Abstract] [Full Text] [PDF]
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M. Nishihara, H. Ogura, N. Ueda, M. Tsuruoka, C. Kitabayashi, F. Tsuji, H. Aono, K. Ishihara, E. Huseby, U. A. K. Betz, et al. IL-6-gp130-STAT3 in T cells directs the development of IL-17+ Th with a minimum effect on that of Treg in the steady state Int. Immunol., June 1, 2007; 19(6): 695 - 702. [Abstract] [Full Text] [PDF]
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W. Wang, M. Milani, N. Ostlie, D. Okita, R. K. Agarwal, R. Caspi, and B. M. Conti-Fine C57BL/6 Mice Genetically Deficient in IL-12/IL-23 and IFN-{gamma} Are Susceptible to Experimental Autoimmune Myasthenia Gravis, Suggesting a Pathogenic Role of Non-Th1 Cells J. Immunol., June 1, 2007; 178(11): 7072 - 7080. [Abstract] [Full Text] [PDF]
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 J. F. Wright, Y. Guo, A. Quazi, D. P. Luxenberg, F. Bennett, J. F. Ross, Y. Qiu, M. J. Whitters, K. N. Tomkinson, K. Dunussi-Joannopoulos, et al. Identification of an Interleukin 17F/17A Heterodimer in Activated Human CD4+ T Cells J. Biol. Chem., May 4, 2007; 282(18): 13447 - 13455. [Abstract] [Full Text] [PDF]
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S. Nakae, Y. Iwakura, H. Suto, and S. J. Galli Phenotypic differences between Th1 and Th17 cells and negative regulation of Th1 cell differentiation by IL-17 J. Leukoc. Biol., May 1, 2007; 81(5): 1258 - 1268. [Abstract] [Full Text] [PDF]
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A. Maitra, F. Shen, W. Hanel, K. Mossman, J. Tocker, D. Swart, and S. L. Gaffen Distinct functional motifs within the IL-17 receptor regulate signal transduction and target gene expression PNAS, May 1, 2007; 104(18): 7506 - 7511. [Abstract] [Full Text] [PDF]
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J. J. Yu, M. J. Ruddy, G. C. Wong, C. Sfintescu, P. J. Baker, J. B. Smith, R. T. Evans, and S. L. Gaffen An essential role for IL-17 in preventing pathogen-initiated bone destruction: recruitment of neutrophils to inflamed bone requires IL-17 receptor-dependent signals Blood, May 1, 2007; 109(9): 3794 - 3802. [Abstract] [Full Text] [PDF]
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K. Coppieters, P. Dewint, K. Van Beneden, P. Jacques, S. Seeuws, G. Verbruggen, D. Deforce, and D. Elewaut NKT cells: manipulable managers of joint inflammation Rheumatology, April 1, 2007; 46(4): 565 - 571. [Abstract] [Full Text] [PDF]
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M. Umemura, A. Yahagi, S. Hamada, M. D. Begum, H. Watanabe, K. Kawakami, T. Suda, K. Sudo, S. Nakae, Y. Iwakura, et al. IL-17-Mediated Regulation of Innate and Acquired Immune Response against Pulmonary Mycobacterium bovis Bacille Calmette-Guerin Infection J. Immunol., March 15, 2007; 178(6): 3786 - 3796. [Abstract] [Full Text] [PDF]
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(n = 13) and IL-17-/- mice, • (n = 12). Data obtained from two independent experiments were combined and shown. Average and SD are indicated. *, p < 0.005 vs IL-17+/+ mice by 
2 test. 
, p < 0.01, and 
, p < 0.05 vs IL-17+/+ mice by Mann-Whitney U test.
