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Toxoplasma Gondii Glycoprotein 130 Hypermorphs to IL-6 Mediates The IL-6 Mediates the Susceptibility of Glycoprotein 130 Hypermorphs to Toxoplasma gondii This information is current as Jonathan S. Silver, Jason S. Stumhofer, Sara Passos, of September 29, 2021. Matthias Ernst and Christopher A. Hunter J Immunol 2011; 187:350-360; Prepublished online 23 May 2011; doi: 10.4049/jimmunol.1004144 http://www.jimmunol.org/content/187/1/350 Downloaded from Supplementary http://www.jimmunol.org/content/suppl/2011/05/23/jimmunol.100414 Material 4.DC1 http://www.jimmunol.org/ References This article cites 65 articles, 30 of which you can access for free at: http://www.jimmunol.org/content/187/1/350.full#ref-list-1 Why The JI? Submit online. • Rapid Reviews! 30 days* from submission to initial decision by guest on September 29, 2021 • No Triage! Every submission reviewed by practicing scientists • Fast Publication! 4 weeks from acceptance to publication *average Subscription Information about subscribing to The Journal of Immunology is online at: http://jimmunol.org/subscription Permissions Submit copyright permission requests at: http://www.aai.org/About/Publications/JI/copyright.html Email Alerts Receive free email-alerts when new articles cite this article. Sign up at: http://jimmunol.org/alerts The Journal of Immunology is published twice each month by The American Association of Immunologists, Inc., 1451 Rockville Pike, Suite 650, Rockville, MD 20852 Copyright © 2011 by The American Association of Immunologists, Inc. All rights reserved. Print ISSN: 0022-1767 Online ISSN: 1550-6606. The Journal of Immunology IL-6 Mediates the Susceptibility of Glycoprotein 130 Hypermorphs to Toxoplasma gondii Jonathan S. Silver,* Jason S. Stumhofer,* Sara Passos,*,1 Matthias Ernst,† and Christopher A. Hunter* IL-6 and IL-27 are closely related cytokines that play critical but distinct roles during infection with Toxoplasma gondii. Thus, IL-6 is required for the development of protective immunity to this pathogen, whereas IL-27 is required to limit infection-induced pathology. Paradoxically, these factors both signal through gp130, but little is known about how the signals downstream of gp130 are integrated to coordinate the immune response to infection. To better understand these events, gp130 Y757F mice that have a mutation in gp130 at the binding site for suppressor of cytokine signaling 3, a critical negative regulator of gp130 signaling, were infected with T. gondii. These mutant mice were acutely susceptible to this challenge, characterized by an early defect in the production of IL-12 and IFN-g and increased parasite burdens. Consistent with the reduced IL-12 levels, IL-6, but not other Downloaded from gp130 cytokines, was a potent antagonist of IL-12 production by gp130 Y757F macrophages and dendritic cells in vitro. Moreover, in gp130 Y757F mice, blocking IL-6 in vivo, or administration of rIL-12, during infection restored IFN-g production and pro- tective immunity. Collectively, these studies highlight that a failure to abbreviate IL-6–mediated gp130 signaling results in a pro- found anti-inflammatory signal that blocks the generation of protective immunity to T. gondii. The Journal of Immunology, 2011, 187: 350–360. http://www.jimmunol.org/ he transmembrane protein gp130 is a signal-transducing prominent regulators of STAT signaling. These proteins are in- component of the receptors used by several closely re- duced in response to several cytokines that use the STAT-signaling T lated cytokines that include IL-6 and IL-27, as well as IL- pathway, and among the SOCS family members, SOCS3 plays 11, oncostatin M, LIF, cardiotrophin-like cytokine, cytokine-like a critical role in specifically limiting gp130-mediated signaling. factor 1, and ciliary neurotrophic factor (1). Binding of IL-6/ This inhibitory effect has been associated with the ability of gp130 family members to their specific receptor a-chains allows SOCS3 to bind to gp130 at the tyrosine residue in position 757 as for high-affinity interactions with gp130 and activation of JAKs well as its ability to act as a ubiquitin ligase, targeting the asso- (JAK1, JAK2, and Tyk2), which ultimately results in recruitment ciated receptor complex for degradation (3–7). of STAT1 and STAT3. Following phosphorylation, the STATs The significance of SOCS3 in limiting gp130 signaling is il- by guest on September 29, 2021 dimerize and translocate to the nucleus where they can act as lustrated by the work of two groups that generated gp130 mutant transcription factors. There are several mechanisms in place that mice: gp130 Y757F mice have a mutation in the binding site of limit gp130-mediated Jak/STAT signaling; these include dissoci- SOCS3, whereas gp130 Y759F mice express the human gp130 ation of JAKs from the receptor, endocytosis of the receptor receptor with a similar mutation (8, 9). In both cases, activation complex, and nuclear export and dephosphorylation of activated of STAT3 is sustained in response to stimulation with gp130- STAT molecules (2). However, members of the suppressor of signaling cytokines, which leads to aberrant pathology. For ex- cytokine signaling (SOCS) family are regarded as the most ample, the gp130 Y757F mice develop gastric adenoma and he- matopoietic defects, driven by IL-11 and IL-6, respectively (10, 10–13). In contrast, gp130 Y759F mice develop an autoimmune *Department of Pathobiology, School of Veterinary Medicine, University of Penn- arthritis driven by STAT3-mediated overproduction of IL-7 (14, sylvania, Philadelphia, PA 19104; and †Ludwig Institute for Cancer Research, Mel- bourne, Victoria, Australia 3052 15). Consistent with the phenotype of the gp130 mutant mice, 1Current address: Servic¸o de Imunologia Hospital Universita´rio, Salvador, Bahia, multiple studies have highlighted the role of this receptor and Brazil. its corresponding cytokines in mediating the inflammation asso- Received for publication December 23, 2010. Accepted for publication April 16, ciated with cancer and autoimmunity (16–18). However, despite 2011. the body of work highlighting the importance of regulated This work was supported by Ludwig Institute for Cancer Research, the state of gp130-mediated signaling in inflammation associated with cancer Pennsylvania, National Institutes of Health Grant AI42334, and National Institutes and autoimmunity, very little is understood about how control of Health Grant AI 084882. J.S. Silver is supported by National Institutes of Health T32 Training Grant AI007532, the state of Pennsylvania, and the Penn Center for of gp130-mediated signaling impacts infection-induced inflam- Molecular Studies in Digestive and Liver Diseases. mation. Address correspondence and reprint requests to Dr. Christopher A. Hunter, Depart- Toxoplasma gondii is an obligate intracellular parasite that is an ment of Pathobiology, School of Veterinary Medicine, Hill Pavilion, Room 313, 380 important opportunistic infection in immunocompromised indi- South University Avenue, University of Pennsylvania, Philadelphia, PA 19104-6008. E-mail address: [email protected] viduals, especially those with defects in T cell function (19, 20). The online version of this article contains supplemental material. Challenge with this organism induces a highly polarized Th1 re- Abbreviations used in this article: BFA, brefeldin A; DC, dendritic cell; KO, knock- sponse characterized by production of IL-12 by macrophages, out; MHC II, MHC class II; PEC, peritoneal exudate cell; SHP2, Src homology neutrophils, and dendritic cells (DCs), which leads to IFN-g region 2 domain-containing phosphatase 2; SOCS, suppressor of cytokine signaling; production by NK cells as well as CD4+ and CD8+ T cells (21, STAg, soluble toxoplasma Ag; WT, wild-type. 22). IFN-g is the major mediator of resistance to T. gondii and Copyright Ó 2011 by The American Association of Immunologists, Inc. 0022-1767/11/$16.00 induces a variety of antimicrobial mechanisms that allow the host www.jimmunol.org/cgi/doi/10.4049/jimmunol.1004144 The Journal of Immunology 351 to control this infection (23). Relevant to this work, the cytokines Preparation of bone marrow-derived macrophages and IL-6 and IL-27, which both signal through gp130, have important isolation of primary DC roles during experimental toxoplasmosis. Thus, mice deficient in Bone marrow from naive WT and gp130 Y757F littermates was harvested, IL-6 develop high cyst burdens and succumb to a severe en- and single-cell suspensions were cultured at a density of 4 3 105 cells/petri cephalitis associated with a failure to control parasite replication dish for 7 d. DMEM was supplemented with HEPES, penicillin, strepto- (24, 25). In addition, mice that lack gp130 specifically in astro- mycin, sodium pyruvate, and cell-free supernatant from cultures of L929 cytes are more susceptible to infection because of uncontrolled fibroblasts. Media and L929 supernatant were replenished at day 4. For isolation of primary DC, spleens and lymph nodes were pooled from parasite replication, resulting in pathology in the brain (26). Thus, two to three 6- to 8-wk-old naive WT and gp130 Y757F mice. Single-cell IL-6 and gp130 are essential for the development of a protective suspensions were lysed in 0.86% NH4Cl and run on Lympholyte gradients immune response that allows the host to control parasite replica- to enrich for live cells. Remaining cell suspensions were then used to + tion. In contrast, mice that lack WSX-1, the a-chain of the purify CD11c DCs using a MACS column (Milltenyi Biotec, Bergisch Gladbach, Germany) according to the manufacturer’s protocol. A total of IL-27R, control this parasite effectively but develop lethal T cell- 7.5 3 104 purified DCs were cultured per well in 200 ml complete RPMI mediated immunopathology, indicating that IL-27 plays a critical 1640 medium on a 96-well plate and activated with LPS (100 ng/ml), role in limiting infection-induced inflammation and pathology (27, IFN-g (100 U/ml), IL-6 (50 ng/ml), or IL-27 (100 ng/ml; Amgen, Thou- 28). Taken together, these studies highlight the diverse signals sand Oaks, CA) for 24 h before harvesting supernatants for ELISA.
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