Amelioration of autoimmune arthritis by adoptive transfer of Foxp3-expressing regulatory B cells is associated with the Treg/Th17 cell balance
- Mi Kyung Park†1,
- Young Ok Jung†2,
- Seon-Yeong Lee†1,
- Seung Hoon Lee1,
- Yu Jung Heo1,
- Eun Kyung Kim1,
- Hye Jwa Oh1,
- Young Mee Moon1,
- Hye-Jin Son1,
- Min Jung Park1,
- Sung Hwan Park3,
- Ho Youn Kim3,
- Mi La Cho†1Email author and
- Jun Ki Min†4, 5Email author
© The Author(s) 2016
Received: 14 July 2015
Accepted: 11 June 2016
Published: 28 June 2016
Foxp3 is a key regulator of the development and function of regulatory T cells (Tregs), and its expression is thought to be T cell-restricted. We found that B cells in mice can express Foxp3 and B cells expressing Foxp3 may play a role in preventing the development of collagen-induced arthritis (CIA) in DBA/1J mice.
Foxp3 expression was modulated in CD19+ B cells by transfection with shRNA or using an over-expression construct. In addition, Foxp3-transfected B cells were adoptively transferred to CIA mice. We found that LPS or anti-IgM stimulation induced Foxp3 expression in B cells. Foxp3-expressing B cells were found in the spleens of mice.
Over-expression of Foxp3 conferred a contact-dependent suppressive ability on proliferation of responder T cells. Down-regulation of Foxp3 by shRNA caused a profound induction in proliferation of responder T cells. Adoptive transfer of Foxp3+CD19+ B cells attenuated the clinical symptoms of CIA significantly with concomitant suppression of IL-17 production and enhancement of Foxp3 expression in CD4+ T cells from splenocytes.
Our data indicate that Foxp3 expression is not restricted to T cells. The expression of Foxp3 in B cells is critical for the immunoregulation of T cells and limits autoimmunity in a mouse model.
KeywordsFoxp3 Regulatory B cell Th17 Arthritis
B cells exert a variety of immune functions, including the production of immunoglobulins (Igs) and cytokines, the presentation of antigens, and the regulation of dendritic cells [1–4]. B cells are generally considered to positively regulate immune responses by producing antigen(Ag)-specific antibodies (Abs) and inducing CD4+ T cell activation . B cells are involved in the development of several autoimmune disorders through the production of pathogenic Igs [6, 7]. Especially, immune-regulatory roles of B cells in autoimmune diseases have been reported that specific B cell subsets regulate immune responses and participate in the induction of immune tolerance [8, 9].
The existence of B cells with regulatory properties has been widely reported [10–14]. Several studies have shown that absence of B cells exacerbated pathologic inflammatory responses in autoimmune diseases [12, 14]. B cell-deficient (μMT) mice lacked the capacity to resolve inflammation in Experimental Autoimmune Encephalomyelitis . Mizoguchi and colleagues introduced the term ‘regulatory B cells (Bregs)’ to designate B cells with negative regulatory properties . Experimental studies have demonstrated that the absence or loss of Bregs exacerbates symptoms in several experimental autoimmune disease model including collagen-induced arthritis (CIA) [15–21]. Additionally, Bregs showed therapeutic properties in autoimmune arthritis mice models [18, 22].
Rheumatoid arthritis (RA) is a debilitating autoimmune disease characterized by chronic inflammation and destruction of the joints has been considered to be a Th1 and/or Th17-mediated disease. However, B cells also play important roles in the pathogenesis of RA. B cells present within the synovial membrane of affected joints are involved directly in sustained inflammation in the rheumatoid synovium , and play a critical role in the synthesis of rheumatoid factor (RF) . The therapeutic success of B cell depletion using a mAb against the B-cell surface molecule CD20 (Rituximab; RTX) has brought in a renewed focus on the role of B cells in the pathogenesis and control of RA and other autoimmune diseases [24, 25]. Interestingly, regulatory B cells have also been proposed to play a role in the K/BxN arthritis mouse model, a model in which Igs are required for disease development. Furthermore, the number of regulatory B cells was negatively correlated with disease activity in new onset RA patients . Several different Breg subsets have now been identified and characterized phenotypically as CD5+ B-1a, CD1d+ marginal zone B cells, transitional-2-marginal zone precursor B cells, and CD1dhiCD5+CD19hi in mouse models.
The transcription factor Foxp3 is a master regulator of Tregs, controlling their development and function. A role for Foxp3 in maintaining self tolerance has been shown in scurfy mice, and in patients with immunodysregulation, polyendocrinopathy, enteropathy, and X-linked (IPEX) syndrome as the causative genetic anomaly that results in severe autoimmune diseases [27–29]. The expression of Foxp3 in conventional T cells confers suppressive activity and induces the expression of associated molecules such as CD25, cytotoxic T lymphocyte antigen 4 (CTLA4), and glucocorticoid-induced TNF receptor-related protein (GITR) [30–32]. These findings suggest that B cells with suppressive activity may also express Foxp3. Foxp3 expressing CD19(+)CD5(+) B cell population was identified in human peripheral blood mononuclear cells and regulatory properties of this cell type was proposed . The Foxp3 expressing regulatory B cells were identified as strong suppressors in milk allergy in human.
In the present study, we investigated the existence of Foxp3-expressing B cells, and their regulatory roles in mice arthritis model, by testing whether they could regulate the proliferation of effector T cells in vitro through a cell-to-cell contact-dependent mechanism. Furthermore, we found a therapeutic effect of Foxp3+ B cells in autoimmune arthritis by performing cell transfer studies in CIA mice, an animal model of RA. We observed that the Foxp3+ B cells showed a strong suppressive effect against arthritis in CIA mice.
Male DBA/1J mice aged 6–8 weeks were purchased from the Charles River Laboratory (Yokohama, Japan). Mice were housed in groups of 10 and maintained at a mean temperature of 21 °C (±2 °C) on a 12-h light/12-h dark cycle, with food and water available ad libitum. All experimental procedures were examined and approved by the Animal Research Ethics Committee of the Catholic University of Korea (permit number: CUMC-2009-0044-01), which conforms to all National Institutes of Health of the USA guidelines. All surgeries were performed under isoflurane anesthesia, and all efforts were made to minimize suffering.
Cell preparation and culture
The A20 cell line (mouse B cell lymphoma) was purchased from the American Type Culture Collection (ATCC; Rockville, MD, USA). Spleens were collected for cell preparations from DBA/1J or arthritis mice. To purify CD19+ B cells or CD4+ T cells, splenocytes were incubated with CD19 or CD4 microbeads (Miltenyi Biotec, Auburn, CA, USA) and isolated on MACS separation columns. B cells or T cells determined by staining with FITC-labeled anti-CD19 mAb or PE-labeled anti-CD4 mAb, respectively (BD Biosciences Pharmingen, San Diego, CA, USA). These cells were >98 % purity. CD19+ B cells or A20 cells were cultured with various stimuli, such as 10 µg/ml lipopolysaccharide (LPS; Sigma-Aldrich, St. Louis, MO, USA) or 10 µg/ml anti-IgM (Jackson ImmunoResearch, West Grove, PA, USA) for 72 h.
Flow cytometric analysis
CD19+ B cells were resuspended in 4 % BSA flow buffer and blocked with CD16/CD32 Fc antibody (BD Pharmingen). Cells were incubated on ice for 30 min with FITC-labeled anti-CD19 mAb or PerCP cy5.5-labeled anti-CD4 mAb (all from eBioscience, San Diego, CA, USA). For intracellular staining of Foxp3 and CTLA4, cells were fixed, permeabilized, and stained with FITC- or PE-labeled anti-Foxp3 mAb and/or PE-labeled anti-CTLA4 mAb (all from eBioscience). Finally, cells were analyzed using a FACSCalibur (Becton–Dickinson, San Jose, CA, USA). Cells that stained positively for CD4, CD19, CD25, IL-17 and Foxp3 were counted visually at higher magnification by four individuals, and the mean values were presented in the form of a graph.
Transfection of CD19+ B cells
The Foxp3 open reading frame (ORF) was codon optimized for mammalian codon usage and was synthesized by Genscript Corp. (Piscataway, NJ, USA). The Foxp3 ORF was subcloned into the pcDNA3.1 (+) mammalian expression vector (Invitrogen, Carlsbad, CA, USA), digested with Hindlll and Xho l sites. The construct was verified by DNA sequencing (Macrogen, Seoul, Korea). Foxp3-specific targeting short hairpin RNA (shRNA) was purchased from Santa Cruz Biotechnology (Santa Cruz, CA, USA). For transfection, splenic CD19+ B cells were seeded in 24-well plates. Cells were transfected with 1.5 µg of DNA using poly-MAG and Magneto FACTOR plates (Chemicell GmbH, Berlin, Germany), according to the manufacturer’s instructions. Cell viability was assessed using the Cell Counting kit-8 (CCK-8, Dojindo Laboratories, Kumamoto, Japan).
RT-PCR analysis of mRNA expression
Total RNA was extracted using TRIZOL® Reagent (Invitrogen) and cDNA synthesis was performed using oligo-dT primers and AMV reverse transcriptase (Promega, Mannheim, Germany), according to the manufacturer’s instructions. PCR amplification of cDNA aliquots was performed by addition of 2.5 mM dNTPs, 2.5 U Taq DNA polymerase (Takara, Shiga, Japan), and 0.25 µM sense and antisense primers. The following sense and antisense primers were used: mice Foxp3, 5′- CCC AGG AAA GAC AGC AAC CTT-3′ (sense) and 5′- TTC TCA CAA CCA GGC CAC TTG-3′ (antisense), and mice β-actin, 5′-GAA ATC GTG CGT GAC ATC AAA G-3′ (sense) and 5′-TGT AGT TTC ATG GAT GCC ACA G-3′ (antisense). Reactions occurred in a DNA thermal cycler (PerkinElmer, Norwalk, CT) and comprised 30–35 cycles of 94 °C for 30 s, 60 °C for 30 s, and 72 °C for 30 s. PCR products were run on a 2.5 % agarose gel and gels and visualized under ultraviolet light using a Gel-doc 1000 (Bio-Rad, Hercules, CA, USA).
Western blot analysis
CD19+ B cell lysates were denatured in SDS, resolved by 10 % SDS-PAGE, and transferred to polyvinylidene fluoride membranes (Amersham Pharmacia, NJ, USA). Membranes were pre-incubated with 5 % skimmed milk in TBS for 2 h at room temperature. Primary Abs directed against Foxp3 (Santa Cruz Biotechnology), diluted 1/200 in blocking buffer (5 % skimmed milk in TBS), were then added and the samples incubated overnight at 4 °C. After the samples were washed for four times in TBST, HRP-conjugated secondary Abs were added and incubated for 1 h at room temperature. Finally, membranes were washed in TBST and the hybridized bands were detected with an ECL detection kit (Pierce, Rockford, IL, USA).
Confocal immunofluorescence assay
For confocal staining, 7-µm sections of spleen tissue was fixed in acetone and blocked with 20 % FCS/PBS. After washing, slides were stained using PE or FITC-labeled anti-Foxp3, PE-labeled anti-IL-17, biotinylated anti-CD19, APC-labeled anti-CD25 and FITC, or PerCP cy5.5-labeled anti-CD4, followed by streptavidin-FITC. After being washed, slides were mounted and visualized using a Zeiss microscope (LSM 510 Meta; Carl Zeiss, Oberkochen, Germany). Results were mean value of 4 sections in spleens from 3 animals. We presented representative figure.
CD4+CD25− T cells were isolated from spleens of arthritic mice by magnetic bead cell sorting using an untouched CD4+ T Cell Isolation Kit II and CD25 Microbeads (all from Miltenyi Biotec, Bergisch Gladbach, Germany), according to the manufacturer’s instructions. To assess the suppressive activities of Foxp3-transfected CD19+ B cells, CD4+CD25−responder T cells (5 × 104/well) were cultured with a 1:1 ratio of shRNA or Foxp3-transfected CD19+ B cells (which were stimulated with LPS or anti-IgM) in the presence or absence of bovine type II collagen (CII) (Chondrex Inc., Redmond, WA, USA), in a 100 ng/ml anti-CD3-coated 96-well plate. In some cases, Foxp3-transfected CD19+ B cells were placed in the inner transwell chamber. During the last 16 h of culture, cells were pulsed with 3H-thymidine (1 μCi/well; MP Biomedicals, Seven Hills, Australia). Cells were assessed for thymidine incorporation in a Microbeta counter (Wallac Oy 1450 MicroBeta; Wallac, Melbourne, Australia).
Induction and clinical assessment of arthritis
CII was dissolved in 0.1 M acetic acid solution (2 mg/ml) by gentle rotation at 4 °C overnight. Mice were injected intradermally at the base of the tail with 100 μg CII emulsified with an equal volume of CFA containing 2 mg/ml Mycobacterium tuberculosis (Chondrex Inc). On day 14, a second injection of CII in IFA was administered. Arthritic indices were evaluated three times weekly by three or more independent investigators until 9 weeks after the first immunization. The scale of the arthritis index ranged from 0 to 4. Scores were defined as follows: 0, no evidence of erythema or swelling; 1, erythema and mild swelling confined to the mid-foot (tarsal part) or ankle joint; 2, erythema and moderate swelling extending from the ankle to the mid-foot; 3, erythema and moderate swelling extending from the ankle to the metatarsal joints; 4, erythema and severe swelling encompassing the ankle, foot, and digits .
Histological assessment of arthritis
At sacrifice, knee joints (mid-tibia to mid-femur) were harvested, and the joints were fixed overnight in 4 % paraformaldehyde Decalcified limbs were embedded in paraffin and sectioned to a 7-µm thickness. Tissues were stained with hematoxylin-eosin (H&E), Toluidine blue, and Safranin O. For histological evaluation of arthritis, sections were evaluated in a blind manner. The scores were evaluated as described previously .
Splenic CD19+ B cells of naïve mice were purified with magnetic beads (Miltenyi Biotec). Purified spleen B cells were transfected with mock or Foxp3 over-expression construct and cultured with LPS for 72 h. Purified 10 × 106 Foxp3-transfected CD19+ B cells were suspended in a total of 200 μl saline and transferred intravenously into mice on days 7 and 28 after CII immunization.
Experimental values presented are the means ± SD. Student’s t tests were performed to calculate the statistical differences between means of different variables, and P values less than 0.05 (two-tailed) were considered significant.
LPS and IgM stimulation induced Foxp3 expression in mouse B cells
CD19+ Foxp3+ B cells exist in spleens of CIA mice
Foxp3-transfected B cells have suppressor activity in vitro
Foxp3+ expressing B cells-mediated cell contact-dependent suppression of T cell proliferation
Foxp3-transfected B cells inhibit autoimmune arthritis in mice
Foxp3 is the most specific marker of regulatory T cells [31, 37]. Up to now, Foxp3 expression has been found only in CD4+ T cells and in some tumor cell lines . Transformation of B cells with EBV was reported to express Foxp3, although normal B cells do not express Foxp3 . In this study, we showed that Foxp3-expressing CD19+ B cells exist in both normal and autoimmune arthritis mice. The origins of these B cells and how they develop remain unclear. Given the fact that Foxp3+CD19+ B cells constitute only a small fraction of B cells, transfection of Foxp3 into B cells provides a useful method to generate regulatory B cells in vitro. In vitro-generated regulatory B cells can be utilized to inhibit the progression of ongoing autoimmune processes. Our data suggest that transfection of Foxp3 into CD19+ B cells induced functional regulatory T cells and suppressed effector T cell proliferation. As a result, Foxp3-infected B cells delayed the onset of arthritis and suppressed its severity in CIA mice.
Regulatory B cell subsets are recognized as an important component of the immune system. Several reports have shown that regulatory B cells influence T cell activation and inflammatory responses through the secretion of IL-10 . Several phenotypes of regulatory B cells have been described. Peritoneal CD5+ B-1a cells are known to produce IL-10 [4, 17]. CD5+ B cells also produce IL-10 upon IL-12 stimulation . Splenic B cells with a CD21+ CD23− MZ phenotype from lupus mice produce IL-10 in response to CpG stimulation . Splenic CD1dhiCD21+ CD23+IgM+ B cells with a T2-MZP phenotype also produced IL-10 and inhibited the development of CIA . IL-10-producing CD1dhiCD5+ regulatory B cell subset showed a suppressive effect against autoimmune encephalitis . Recently, a novel subset of IL-10-producing regulatory B cells, distinct from MZ or B-1a cells, was discovered in the intestine and identified as CD5− CD11b− CD21+B cells . Regulatory B cells have been demonstrated to exert immunosuppressive functions by inducing Tregs or skewing the cytokine profile of effector T cells toward an immunosuppressive phenotype [42, 43].
Transcription factors play important roles in the development and lineage commitment of lymphocytes. Little is known about the transcriptional factors that regulate the generation of regulatory B cells. Foxp3 is necessary and sufficient for Treg generation and function . Also, Foxp3 expression in T cells is known to be restricted. In our study, the existence of Foxp3+ Bregs was demonstrated in mice arthritis model. Foxp3+ may play a role in the generation of Bregs, and the over-expression of Foxp3 in B cells induced regulatory effects.
The BCR plays an important role in the development and proliferation of pre-B and B cells [45, 46]. Similarly, Foxp3+ regulatory T cell differentiation and function in the periphery is also dependent on suboptimal TCR stimulation . Our results revealed that expression of Foxp3 is induced after BCR stimulation by anti-IgM or LPS. The frequency of splenic Foxp3+CD19+ B cells was significantly lower in WT than CIA mice. Up-regulation of Foxp3 in B cells of CIA mice may be a consequence of normal B cell activation under the influence of inflammatory conditions. Also, stimulation of Foxp3+CD19+ B cells with either LPS or anti-IgM, increased their suppressor activity. Although BCR stimulation induced Foxp3, maximal and sustained Foxp3 expression may require additional stimulation with ligands such as CD40 and LPS. Increased Breg cells in CIA animal may rouse the question why these Breg cells cannot protect host from arthritis. We speculate that increased Breg cells are not sufficient in number or function to suppress over-activated effector T cells in arthritis animal model in vivo. There are also other possibilities like increased apoptosis of Breg cells in inflammatory conditions. Further studies may be needed to prove this hypothesis.
Interestingly, our data showed that adoptive transfer of Foxp3+CD19+ B cells-increased the number of Foxp3+ Tregs in vivo. Vallerskog et al.  reported that Foxp3+ T cell numbers were significantly increased in peripheral blood of rituximab-infused SLE patients. Alteration of T cell populations may be important in the B cell depletion therapy used for autoimmune diseases. Our results showed that Foxp3+ Bregs modulated a T cell population. The interaction between B and T cells will likely be important in the treatment of arthritis and other autoimmune diseases.
The mechanism how FoxP3 B cells are working in vivo needs be elucidated. We observed that Foxp3 B cells secreted large amount of IL-10 and TGF-β (data is not shown). IL-10 or TGF-β producing B cells have been reported to play important role in regulatory function [49–51]. IL-10 inhibits pro-inflammatory cytokine and supports regulatory T cell differentiation so play pivotal role of immune tolerance.
In summary, we report a significant function of regulatory B cells expressing Foxp3 in CIA. The regulatory effect of Foxp3+ B cell showed contact-dependent. Foxp3+ B cells successfully suppress arthritis and induced the Treg cell population. Identification of mechanism related to the induction of Treg cells remains an important area for future study. Therapy using Foxp3+ B cells is considered as an intriguing new intervention to approach various autoimmune/inflammatory diseases.
regulatory T cells
immunodysregulation, polyendocrinopathy, enteropathy, and X-linked
cytotoxic T lymphocyte antigen 4
glucocorticoid-induced TNF receptor-related protein
open reading frame
Conceived and designed the experiments: MKP, YOJ, MLC, JKM. Performed the experiments: MKP, SYL, YJH, SHL, EKK, HJO, HJS. Analyzed the data: SYL, YMM. Contributed reagents/materials/analysis tools: MKP, SYL, YMM, MJP, SHP, HYK. Contributed to the writing of the manuscript: MKP, YOJ, MLC. All authors read and approved the final manuscript.
This study was supported by a grant of the Korean Health Technology R&D Project, Ministry for Health & Welfare, Republic of Korea (HI14C3417). This study was supported by a grant of the Korean Health Technology R&D Project, Ministry for Health & Welfare, Republic of Korea (HI14C1851). This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (NRF-2015R1D1A1A01057072).
The authors declare that they have no competing interests.
Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
- Wolf SD, Dittel BN, Hardardottir F, Janeway CA Jr. Experimental autoimmune encephalomyelitis induction in genetically B cell-deficient mice. J Exp Med. 1996;184:2271–8.View ArticlePubMedPubMed CentralGoogle Scholar
- Moulin V, Andris F, Thielemans K, Maliszewski C, Urbain J, Moser M. B lymphocytes regulate dendritic cell (DC) function in vivo: increased interleukin 12 production by DCs from B cell-deficient mice results in T helper cell type 1 deviation. J Exp Med. 2000;192:475–82.View ArticlePubMedPubMed CentralGoogle Scholar
- Takemura S, Klimiuk PA, Braun A, Goronzy JJ, Weyand CM. T cell activation in rheumatoid synovium is B cell dependent. J Immunol. 2001;167:4710–8.View ArticlePubMedGoogle Scholar
- Harris DP, Haynes L, Sayles PC, Duso DK, Eaton SM, Lepak NM, Johnson LL, Swain SL, Lund FE. Reciprocal regulation of polarized cytokine production by effector B and T cells. Nat Immunol. 2000;1:475–82.View ArticlePubMedGoogle Scholar
- LeBien TW, Tedder TF. B lymphocytes: how they develop and function. Blood. 2008;112:1570–80.View ArticlePubMedPubMed CentralGoogle Scholar
- Korganow AS, Ji H, Mangialaio S, Duchatelle V, Pelanda R, Martin T, Degott C, Kikutani H, Rajewsky K, Pasquali JL, et al. From systemic T cell self-reactivity to organ-specific autoimmune disease via immunoglobulins. Immunity. 1999;10:451–61.View ArticlePubMedGoogle Scholar
- Fagarasan S, Watanabe N, Honjo T. Generation, expansion, migration and activation of mouse B1 cells. Immunol Rev. 2000;176:205–15.View ArticlePubMedGoogle Scholar
- Ozaki ME, Coren BA, Huynh TN, Redondo DJ, Kikutani H, Webb SR. CD4 + T cell responses to CD40-deficient APCs: defects in proliferation and negative selection apply only with B cells as APCs. J Immunol. 1999;163:5250–6.PubMedGoogle Scholar
- Gonnella PA, Waldner HP, Weiner HL. B cell-deficient (mu MT) mice have alterations in the cytokine microenvironment of the gut-associated lymphoid tissue (GALT) and a defect in the low dose mechanism of oral tolerance. J Immunol. 2001;166:4456–64.View ArticlePubMedGoogle Scholar
- Mizoguchi A, Bhan AK. A case for regulatory B cells. J Immunol. 2006;176:705–10.View ArticlePubMedGoogle Scholar
- Serra P, Santamaria P. To ‘B’ regulated: B cells as members of the regulatory workforce. Trends Immunol. 2006;27:7–10.View ArticlePubMedGoogle Scholar
- Mauri C, Ehrenstein MR. The ‘short’ history of regulatory B cells. Trends Immunol. 2008;29:34–40.View ArticlePubMedGoogle Scholar
- Lund FE. Cytokine-producing B lymphocytes-key regulators of immunity. Curr Opin Immunol. 2008;20:332–8.View ArticlePubMedPubMed CentralGoogle Scholar
- Fillatreau S, Gray D, Anderton SM. Not always the bad guys: B cells as regulators of autoimmune pathology. Nat Rev Immunol. 2008;8:391–7.View ArticlePubMedGoogle Scholar
- Mizoguchi A, Mizoguchi E, Smith RN, Preffer FI, Bhan AK. Suppressive role of B cells in chronic colitis of T cell receptor alpha mutant mice. J Exp Med. 1997;186:1749–56.View ArticlePubMedPubMed CentralGoogle Scholar
- Fillatreau S, Sweenie CH, McGeachy MJ, Gray D, Anderton SM. B cells regulate autoimmunity by provision of IL-10. Nat Immunol. 2002;3:944–50.View ArticlePubMedGoogle Scholar
- Mizoguchi A, Mizoguchi E, Takedatsu H, Blumberg RS, Bhan AK. Chronic intestinal inflammatory condition generates IL-10-producing regulatory B cell subset characterized by CD1d upregulation. Immunity. 2002;16:219–30.View ArticlePubMedGoogle Scholar
- Evans JG, Chavez-Rueda KA, Eddaoudi A, Meyer-Bahlburg A, Rawlings DJ, Ehrenstein MR, Mauri C. Novel suppressive function of transitional 2 B cells in experimental arthritis. J Immunol. 2007;178:7868–78.View ArticlePubMedGoogle Scholar
- Yanaba K, Bouaziz JD, Haas KM, Poe JC, Fujimoto M, Tedder TF. A regulatory B cell subset with a unique CD1dhiCD5+ phenotype controls T cell-dependent inflammatory responses. Immunity. 2008;28:639–50.View ArticlePubMedGoogle Scholar
- Matsushita T, Yanaba K, Bouaziz JD, Fujimoto M, Tedder TF. Regulatory B cells inhibit EAE initiation in mice while other B cells promote disease progression. J Clin Invest. 2008;118:3420–30.PubMedPubMed CentralGoogle Scholar
- Haas KM, Watanabe R, Matsushita T, Nakashima H, Ishiura N, Okochi H, Fujimoto M, Tedder TF. Protective and pathogenic roles for B cells during systemic autoimmunity in NZB/W F1 mice. J Immunol. 2010;184:4789–800.View ArticlePubMedPubMed CentralGoogle Scholar
- Mauri C, Gray D, Mushtaq N, Londei M. Prevention of arthritis by interleukin 10-producing B cells. J Exp Med. 2003;197:489–501.View ArticlePubMedPubMed CentralGoogle Scholar
- Panayi GS. B cells: a fundamental role in the pathogenesis of rheumatoid arthritis? Rheumatology (Oxford). 2005;44(Suppl 2):ii3–ii7.Google Scholar
- Martin F, Chan AC. Pathogenic roles of B cells in human autoimmunity; insights from the clinic. Immunity. 2004;20:517–27.View ArticlePubMedGoogle Scholar
- Yanaba K, Bouaziz JD, Matsushita T, Magro CM. St Clair EW, Tedder TF: B-lymphocyte contributions to human autoimmune disease. Immunol Rev. 2008;223:284–99.View ArticlePubMedGoogle Scholar
- Ma L, Liu B, Jiang Z, Jiang Y. Reduced numbers of regulatory B cells are negatively correlated with disease activity in patients with new-onset rheumatoid arthritis. Clin Rheumatol. 2014;33:187–95.View ArticlePubMedGoogle Scholar
- Brunkow ME, Jeffery EW, Hjerrild KA, Paeper B, Clark LB, Yasayko SA, Wilkinson JE, Galas D, Ziegler SF, Ramsdell F. Disruption of a new forkhead/winged-helix protein, scurfin, results in the fatal lymphoproliferative disorder of the scurfy mouse. Nat Genet. 2001;27:68–73.View ArticlePubMedGoogle Scholar
- Wildin RS, Ramsdell F, Peake J, Faravelli F, Casanova JL, Buist N, Levy-Lahad E, Mazzella M, Goulet O, Perroni L, et al. X-linked neonatal diabetes mellitus, enteropathy and endocrinopathy syndrome is the human equivalent of mouse scurfy. Nat Genet. 2001;27:18–20.View ArticlePubMedGoogle Scholar
- Bennett CL, Christie J, Ramsdell F, Brunkow ME, Ferguson PJ, Whitesell L, Kelly TE, Saulsbury FT, Chance PF, Ochs HD. The immune dysregulation, polyendocrinopathy, enteropathy, X-linked syndrome (IPEX) is caused by mutations of FOXP3. Nat Genet. 2001;27:20–1.View ArticlePubMedGoogle Scholar
- Khattri R, Cox T, Yasayko SA, Ramsdell F. An essential role for Scurfin in CD4+CD25+ T regulatory cells. Nat Immunol. 2003;4:337–42.View ArticlePubMedGoogle Scholar
- Hori S, Nomura T, Sakaguchi S. Control of regulatory T cell development by the transcription factor Foxp3. Science. 2003;299:1057–61.View ArticlePubMedGoogle Scholar
- Fontenot JD, Gavin MA, Rudensky AY. Foxp3 programs the development and function of CD4+CD25+ regulatory T cells. Nat Immunol. 2003;4:330–6.View ArticlePubMedGoogle Scholar
- Noh J, Noh G, Kim HS, Kim AR, Choi WS. Allergen-specific responses of CD19(+)CD5(+)Foxp3(+) regulatory B cells (Bregs) and CD4(+)Foxp3(+) regulatory T cell (Tregs) in immune tolerance of cow milk allergy of late eczematous reactions. Cell Immunol. 2012;274:109–14.View ArticlePubMedGoogle Scholar
- Kim WU, Lee WK, Ryoo JW, Kim SH, Kim J, Youn J, Min SY, Bae EY, Hwang SY, Park SH, et al. Suppression of collagen-induced arthritis by single administration of poly(lactic-co-glycolic acid) nanoparticles entrapping type II collagen: a novel treatment strategy for induction of oral tolerance. Arthritis Rheum. 2002;46:1109–20.View ArticlePubMedGoogle Scholar
- Camps M, Ruckle T, Ji H, Ardissone V, Rintelen F, Shaw J, Ferrandi C, Chabert C, Gillieron C, Francon B, et al. Blockade of PI3Kgamma suppresses joint inflammation and damage in mouse models of rheumatoid arthritis. Nat Med. 2005;11:936–43.PubMedGoogle Scholar
- Shevach EM. CD4+CD25+ suppressor T cells: more questions than answers. Nat Rev Immunol. 2002;2:389–400.PubMedGoogle Scholar
- Sakaguchi S, Yamaguchi T, Nomura T, Ono M. Regulatory T cells and immune tolerance. Cell. 2008;133:775–87.View ArticlePubMedGoogle Scholar
- Ebert LM, Tan BS, Browning J, Svobodova S, Russell SE, Kirkpatrick N, Gedye C, Moss D, Ng SP, MacGregor D, et al. The regulatory T cell-associated transcription factor FoxP3 is expressed by tumor cells. Cancer Res. 2008;68:3001–9.View ArticlePubMedGoogle Scholar
- Spencer NF, Daynes RA. IL-12 directly stimulates expression of IL-10 by CD5+ B cells and IL-6 by both CD5+ and CD5− B cells: possible involvement in age-associated cytokine dysregulation. Int Immunol. 1997;9:745–54.View ArticlePubMedGoogle Scholar
- Brummel R, Lenert P. Activation of marginal zone B cells from lupus mice with type A(D) CpG-oligodeoxynucleotides. J Immunol. 2005;174:2429–34.View ArticlePubMedGoogle Scholar
- Booth JS, Griebel PJ, Babiuk LA, Mutwiri GK. A novel regulatory B-cell population in sheep Peyer’s patches spontaneously secretes IL-10 and downregulates TLR9-induced IFNalpha responses. Mucosal Immunol. 2009;2:265–75.View ArticlePubMedGoogle Scholar
- Carter NA, Vasconcellos R, Rosser EC, Tulone C, Munoz-Suano A, Kamanaka M, Ehrenstein MR, Flavell RA, Mauri C. Mice lacking endogenous IL-10-producing regulatory B cells develop exacerbated disease and present with an increased frequency of Th1/Th17 but a decrease in regulatory T cells. J Immunol. 2011;186:5569–79.View ArticlePubMedGoogle Scholar
- Gray M, Miles K, Salter D, Gray D, Savill J. Apoptotic cells protect mice from autoimmune inflammation by the induction of regulatory B cells. Proc Natl Acad Sci USA. 2007;104:14080–5.View ArticlePubMedPubMed CentralGoogle Scholar
- Fontenot JD, Rasmussen JP, Williams LM, Dooley JL, Farr AG, Rudensky AY. Regulatory T cell lineage specification by the forkhead transcription factor foxp3. Immunity. 2005;22:329–41.View ArticlePubMedGoogle Scholar
- Batlle A, Papadopoulou V, Gomes AR, Willimott S, Melo JV, Naresh K, Lam EW, Wagner SD. CD40 and B-cell receptor signalling induce MAPK family members that can either induce or repress Bcl-6 expression. Mol Immunol. 2009;46:1727–35.View ArticlePubMedGoogle Scholar
- Harwood NE, Batista FD. New insights into the early molecular events underlying B cell activation. Immunity. 2008;28:609–19.View ArticlePubMedGoogle Scholar
- Jordan MS, Boesteanu A, Reed AJ, Petrone AL, Holenbeck AE, Lerman MA, Naji A, Caton AJ. Thymic selection of CD4+CD25+ regulatory T cells induced by an agonist self-peptide. Nat Immunol. 2001;2:301–6.View ArticlePubMedGoogle Scholar
- Vallerskog T, Gunnarsson I, Widhe M, Risselada A, Klareskog L, van Vollenhoven R, Malmstrom V, Trollmo C. Treatment with rituximab affects both the cellular and the humoral arm of the immune system in patients with SLE. Clin Immunol. 2007;122:62–74.View ArticlePubMedGoogle Scholar
- Rodgers DT, Pineda MA, McGrath MA, Al-Riyami L, Harnett W, Harnett MM. Protection against collagen-induced arthritis in mice afforded by the parasitic worm product, ES-62, is associated with restoration of the levels of interleukin-10-producing B cells and reduced plasma cell infiltration of the joints. Immunology. 2014;141:457–66.View ArticlePubMedPubMed CentralGoogle Scholar
- Lee SY, Jung YO, Ryu JG, Kang CM, Kim EK, Son HJ, Yang EJ, Ju JH, Kang YS, Park SH, et al. Intravenous immunoglobulin attenuates experimental autoimmune arthritis by inducting reciprocal regulation of Th17 and Treg in an IL-10-dependent manner. Arthritis Rheumatol. 2014;66:1768.View ArticlePubMedGoogle Scholar
- Rosser EC, Blair PA, Mauri C. Cellular targets of regulatory B cell-mediated suppression. Mol Immunol. 2014;62:296–304.View ArticlePubMedGoogle Scholar