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Aiolos Overexpression in Systemic Lupus Erythematosus B Cell

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Aiolos Overexpression in Systemic Lupus Erythematosus B Cell Aiolos Overexpression in Systemic Lupus Erythematosus B Cell Subtypes and BAFF-Induced Memory B Cell Differentiation Are Reduced by CC-220 This information is current as Modulation of Cereblon Activity of September 27, 2021. Yumi Nakayama, Jolanta Kosek, Lori Capone, Eun Mi Hur, Peter H. Schafer and Garth E. Ringheim J Immunol 2017; 199:2388-2407; Prepublished online 28 August 2017; Downloaded from doi: 10.4049/jimmunol.1601725 http://www.jimmunol.org/content/199/7/2388 http://www.jimmunol.org/ Supplementary http://www.jimmunol.org/content/suppl/2017/08/26/jimmunol.160172 Material 5.DCSupplemental References This article cites 131 articles, 45 of which you can access for free at: http://www.jimmunol.org/content/199/7/2388.full#ref-list-1 Why The JI? Submit online. by guest on September 27, 2021 • Rapid Reviews! 30 days* from submission to initial decision • 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 Author Choice Freely available online through The Journal of Immunology Author Choice option 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 © 2017 by The American Association of Immunologists, Inc. All rights reserved. Print ISSN: 0022-1767 Online ISSN: 1550-6606. The Journal of Immunology Aiolos Overexpression in Systemic Lupus Erythematosus B Cell Subtypes and BAFF-Induced Memory B Cell Differentiation Are Reduced by CC-220 Modulation of Cereblon Activity Yumi Nakayama, Jolanta Kosek, Lori Capone, Eun Mi Hur, Peter H. Schafer, and Garth E. Ringheim BAFF is a B cell survival and maturation factor implicated in the pathogenesis of systemic lupus erythematosus (SLE). In this in vitro study, we describe that soluble BAFF in combination with IL-2 and IL-21 is a T cell contact-independent inducer of + human B cell proliferation, plasmablast differentiation, and IgG secretion from circulating CD27 memory and memory-like Downloaded from CD272IgD2 double-negative (DN) B cells, but not CD272IgD+ naive B cells. In contrast, soluble CD40L in combination with IL-2 and IL-21 induces these activities in both memory and naive B cells. Blood from healthy donors and SLE patients have similar circulating levels of IL-2, whereas SLE patients exhibit elevated BAFF and DN B cells and reduced IL-21. B cell differentiation transcription factors in memory, DN, and naive B cells in SLE show elevated levels of Aiolos, whereas Ikaros levels are unchanged. Treatment with CC-220, a modulator of the cullin ring ligase 4-cereblon E3 ubiquitin ligase complex, reduces Aiolos and Ikaros protein levels and BAFF- and CD40L-induced proliferation, plasmablast differentiation, and IgG secretion. The observation http://www.jimmunol.org/ that the soluble factors BAFF, IL-2, and IL-21 induce memory and DN B cell activation and differentiation has implications for extrafollicular plasmablast development within inflamed tissue. Inhibition of B cell plasmablast differentiation by reduction of Aiolos and Ikaros may have utility in the treatment of SLE, where elevated levels of BAFF and Aiolos may prime CD27+ memory and DN memory-like B cells to become Ab-producing plasmablasts in the presence of BAFF and proinflammatory cytokines. The Journal of Immunology, 2017, 199: 2388–2407. cells play a major role in the development of the immune In T cell–dependent driven processes, naive B cells in the extra- response to foreign pathogens by a complex network of follicular regions of secondary lymphoid organs bind Ags to the B activities including BCR Ag recognition, Ag presentation, BCR, and internalize and process these Ags for MHC class II by guest on September 27, 2021 cytokine secretion, and differentiation into Ab-producing plas- presentation to cognate Ag-recognizing TCRs that in turn induce mablasts and plasma cells. The development of B cells and Ag- CD40L expression on the T cell surface. Subsequent binding of induced maturation leading to Ab class selection and secretion CD40 on B cells to CD40L on T cell in the presence of continued has been well studied and is broadly characterized as T cell–de- Ag BCR stimulation can induce extrafollicular proliferation and pendent and –independent processes (1). In T cell–independent short-lived plasmablast differentiation or induce migration to Ab development, naive B cells are activated in the absence of germinal centers, where they can undergo a variety of fates in- T cells by Ags such as polysaccharides that crosslink BCRs or by cluding differentiation into memory cells, affinity maturation by activation of TLRs in the extrafollicular regions of secondary hypersomatic mutation, or differentiation into plasmablasts and lymphoid organs, where the activated B cells proliferate and dif- long-lived plasma cells. ferentiate into short-lived low-affinity Ab-producing plasmablasts. Peripheral circulating B cells represent the net balance of cells that are trafficking to and from the bone marrow, secondary Inflammation and Immunology Translational Development, Celgene Corporation, lymphoid organs, and peripheral tissues at various stages of Summit, NJ 07901 maturation, development, and activation, thus reflect ongoing ORCID: 0000-0003-1179-6625 (E.M.H.). homeostatic immune surveillance activity. Alterations in circu- Received for publication October 6, 2016. Accepted for publication August 3, 2017. lating memory B cells, plasmablasts, plasma cells, and Ab levels Address correspondence and reprint requests to Dr. Garth E. Ringheim, Inflammation often accompany the pathology observed in autoimmune diseases. and Immunology Translational Development, Celgene Corporation, 551 Morris Av- For example, changes in the ratios of circulating CD27+ memory enue, Summit, NJ 07901. E-mail address: [email protected] BcellstoCD272 naive B cells have been described for rheumatoid The online version of this article contains supplemental material. arthritis (RA) (2), systemic lupus erythematosus (SLE) (3–6), Abbreviations used in this article: BAFF-R, BAFF receptor; BCMA, B cell matura- 2 2 tion Ag; Blimp1, B lymphocyte–induced maturation protein 1; CRL4CRBN, cullin and Sjo¨gren’s syndrome (7). Blood levels of CD27 IgD ring ligase 4-cereblon; DN, double-negative; HC, healthy control donor; IgJ, Ig double-negative (DN) B cells with memory-like cell characteris- joining chain; IRF4, IFN regulatory factor 4; MZA, marginal zone analog; NSM, tics are elevated in SLE (8–10) and RA (11, 12). Plasmablasts in nonswitched memory; RA, rheumatoid arthritis; SLE, systemic lupus erythematosus; SwM, switched memory; TACI, transmembrane activator and Ca2+ modulator and the blood also have been described to be elevated in autoimmune cyclophilin ligand interactor; XBP1, X-box-binding protein 1. disease including multiple sclerosis (13), RA (11, 12), and SLE (6, This article is distributed under The American Association of Immunologists, Inc., 14). In SLE, high levels of memory B cells, plasmablasts, and Reuse Terms and Conditions for Author Choice articles. anti-dsDNA Ab reappearance after B cell–depleting therapy are Copyright Ó 2017 by The American Association of Immunologists, Inc. 0022-1767/17/$35.00 correlated to increased rates of disease relapse (15, 16). The www.jimmunol.org/cgi/doi/10.4049/jimmunol.1601725 The Journal of Immunology 2389 ramifications of these increased circulating autoreactive memory differentiation (61, 63). Numerous studies have identified poly- B cells and plasmablasts are that they can lead to their appearance morphisms in IKZF1 and IKZF3 to be associated with a risk for in affected disease tissue, where they enhance local concentrations development of SLE (64–71). Thus, modulation of Aiolos and of Ab and immune complexes, such as observed in the inflamed Ikaros expression has the potential to correct multiple aspects of kidney of a lupus nephritis mouse model (17). The observation the immune dysregulation mediated by B cells and differentiation that plasma cells appear in areas of T cell–B cell interaction in into autoantibody-secreting cells associated with SLE. lupus nephritis kidneys suggests that components of a T cell– We investigated soluble factors associated with SLE that driven B cell activation and differentiation into Ab-secreting cells may contribute to plasmablast differentiation and Ab secretion may take place locally (18). from circulating human memory, DN, and naive B cell subsets. Soluble factors that may play a role in B cell differentiation in the Our data show that BAFF in the presence of IL-2 and IL-21 can presence of T cells include IL-2, IL-21, and the B cell–stimulatory induce plasmablast development from CD27+ memory B cells cytokine, BAFF. IL-21 is a member of the common g-chain cy- and CD272IgD2 DN B cells, whereas having no effect on naive tokine family shown to play a central role in plasmablast and B cells. Mimicking T cell–dependent processes by CD40L treat- plasma cell differentiation during T cell–dependent B cell re- ment of B cells demonstrate a broader capacity to induce B cell sponses (19, 20). In humans, IL-21 is mainly produced by acti- differentiation from memory,
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