1
|
Kuo BS, Li CH, Chen JB, Shiung YY, Chu CY, Lee CH, Liu YJ, Kuo JH, Hsu C, Su HW, Li YF, Lai A, Ho YF, Cheng YN, Huang HX, Lung MC, Wu MS, Yang FH, Lin CH, Tseng W, Yang J, Lin CY, Tsai PH, Chang HK, Wang YJ, Chen T, Lynn S, Liao MJ, Wang CY. IgE-neutralizing UB-221 mAb, distinct from omalizumab and ligelizumab, exhibits CD23-mediated IgE downregulation and relieves urticaria symptoms. J Clin Invest 2022; 132:157765. [PMID: 35912861 PMCID: PMC9337824 DOI: 10.1172/jci157765] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2021] [Accepted: 06/14/2022] [Indexed: 01/08/2023] Open
Abstract
Over the last 2 decades, omalizumab is the only anti-IgE antibody that has been approved for asthma and chronic spontaneous urticaria (CSU). Ligelizumab, a higher-affinity anti-IgE mAb and the only rival viable candidate in late-stage clinical trials, showed anti-CSU efficacy superior to that of omalizumab in phase IIb but not in phase III. This report features the antigenic-functional characteristics of UB-221, an anti-IgE mAb of a newer class that is distinct from omalizumab and ligelizumab. UB-221, in free form, bound abundantly to CD23-occupied IgE and, in oligomeric mAb-IgE complex forms, freely engaged CD23, while ligelizumab reacted limitedly and omalizumab stayed inert toward CD23; these observations are consistent with UB-221 outperforming ligelizumab and omalizumab in CD23-mediated downregulation of IgE production. UB-221 bound IgE with a strong affinity to prevent FcԑRI-mediated basophil activation and degranulation, exhibiting superior IgE-neutralizing activity to that of omalizumab. UB-221 and ligelizumab bound cellular IgE and effectively neutralized IgE in sera of patients with atopic dermatitis with equal strength, while omalizumab lagged behind. A single UB-221 dose administered to cynomolgus macaques and human IgE (ε, κ)-knockin mice could induce rapid, pronounced serum-IgE reduction. A single UB-221 dose administered to patients with CSU in a first-in-human trial exhibited durable disease symptom relief in parallel with a rapid reduction in serum free-IgE level.
Collapse
Affiliation(s)
- Be-Sheng Kuo
- United BioPharma, Inc., Hsinchu, Taiwan.,UBI Asia, Hsinchu, Taiwan.,United Biomedical, Inc., Hauppauge, New York, USA
| | | | | | | | - Chia-Yu Chu
- Department of Dermatology, National Taiwan University Hospital and National Taiwan University College of Medicine, Taipei, Taiwan
| | - Chih-Hung Lee
- Department of Dermatology, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine, Kaohsiung, Taiwan
| | | | | | - Cindy Hsu
- United BioPharma, Inc., Hsinchu, Taiwan
| | | | | | - Annie Lai
- United BioPharma, Inc., Hsinchu, Taiwan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Chang Yi Wang
- United BioPharma, Inc., Hsinchu, Taiwan.,UBI Asia, Hsinchu, Taiwan.,United Biomedical, Inc., Hauppauge, New York, USA
| |
Collapse
|
2
|
The mechanistic and functional profile of the therapeutic anti-IgE antibody ligelizumab differs from omalizumab. Nat Commun 2020; 11:165. [PMID: 31913280 PMCID: PMC6949303 DOI: 10.1038/s41467-019-13815-w] [Citation(s) in RCA: 104] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Accepted: 11/30/2019] [Indexed: 01/21/2023] Open
Abstract
Targeting of immunoglobulin E (IgE) represents an interesting approach for the treatment of allergic disorders. A high-affinity monoclonal anti-IgE antibody, ligelizumab, has recently been developed to overcome some of the limitations associated with the clinical use of the therapeutic anti-IgE antibody, omalizumab. Here, we determine the molecular binding profile and functional modes-of-action of ligelizumab. We solve the crystal structure of ligelizumab bound to IgE, and report epitope differences between ligelizumab and omalizumab that contribute to their qualitatively distinct IgE-receptor inhibition profiles. While ligelizumab shows superior inhibition of IgE binding to FcεRI, basophil activation, IgE production by B cells and passive systemic anaphylaxis in an in vivo mouse model, ligelizumab is less potent in inhibiting IgE:CD23 interactions than omalizumab. Our data thus provide a structural and mechanistic foundation for understanding the efficient suppression of FcεRI-dependent allergic reactions by ligelizumab in vitro as well as in vivo. Immunoglobulin E (IgE) plays a central role in allergic responses, yet therapeutic targeting of IgE with antibodies such as omalizumab is met with various limitations. Here the authors characterize the molecular properties and crystal structure of a new anti-IgE antibody, ligelizumab, for mechanistic insights related to its enhanced suppression activity.
Collapse
|
3
|
Engeroff P, Caviezel F, Mueller D, Thoms F, Bachmann MF, Vogel M. CD23 provides a noninflammatory pathway for IgE-allergen complexes. J Allergy Clin Immunol 2019; 145:301-311.e4. [PMID: 31437490 DOI: 10.1016/j.jaci.2019.07.045] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Revised: 06/21/2019] [Accepted: 07/09/2019] [Indexed: 12/17/2022]
Abstract
BACKGROUND Type I hypersensitivity is mediated by allergen-specific IgE, which sensitizes the high-affinity IgE receptor FcεRI on mast cells and basophils and drives allergic inflammation upon secondary allergen contact. CD23/FcεRII, the low-affinity receptor for IgE, is constitutively expressed on B cells and has been shown to regulate immune responses. Simultaneous binding of IgE to FcεRI and CD23 is blocked by reciprocal allosteric inhibition, suggesting that the 2 receptors exert distinct roles in IgE handling. OBJECTIVE We aimed to study how free IgE versus precomplexed IgE-allergen immune complexes (IgE-ICs) target the 2 IgE receptors FcεRI and CD23, and we investigated the functional implications of the 2 pathways. METHODS We performed binding and activation assays with human cells in vitro and IgE pharmacokinetics and anaphylaxis experiments in vivo. RESULTS We demonstrate that FcεRI preferentially binds free IgE and CD23 preferentially binds IgE-ICs. We further show that those different binding properties directly translate to distinct biological functions: free IgE initiated allergic inflammation through FcεRI on allergic effector cells, while IgE-ICs were noninflammatory because of reduced FcεRI binding and enhanced CD23-dependent serum clearance. CONCLUSION We propose that IgE-ICs are noninflammatory through reduced engagement by FcεRI but increased targeting of the CD23 pathway.
Collapse
Affiliation(s)
- Paul Engeroff
- Department of Rheumatology, Immunology and Allergology, University Hospital Bern, Bern, Switzerland; Department of BioMedical Research, University of Bern, Bern, Switzerland
| | - Flurin Caviezel
- Department of Rheumatology, Immunology and Allergology, University Hospital Bern, Bern, Switzerland; Department of BioMedical Research, University of Bern, Bern, Switzerland
| | - David Mueller
- Department of Rheumatology, Immunology and Allergology, University Hospital Bern, Bern, Switzerland; Department of BioMedical Research, University of Bern, Bern, Switzerland
| | - Franziska Thoms
- Department of Dermatology, Zurich University Hospital, Schlieren, Switzerland
| | - Martin F Bachmann
- Department of Rheumatology, Immunology and Allergology, University Hospital Bern, Bern, Switzerland; Department of BioMedical Research, University of Bern, Bern, Switzerland; Nuffield Department of Medicine, Jenner Institute, University of Oxford, Oxford, United Kingdom
| | - Monique Vogel
- Department of Rheumatology, Immunology and Allergology, University Hospital Bern, Bern, Switzerland; Department of BioMedical Research, University of Bern, Bern, Switzerland.
| |
Collapse
|
4
|
IgE binds asymmetrically to its B cell receptor CD23. Sci Rep 2017; 7:45533. [PMID: 28361904 PMCID: PMC5374546 DOI: 10.1038/srep45533] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Accepted: 02/21/2017] [Indexed: 12/30/2022] Open
Abstract
The antibody IgE plays a central role in allergic disease mechanisms. Its effector functions are controlled through interactions between the Fc region and two principal cell surface receptors FcεRI and CD23. The interaction with FcεRI is primarily responsible for allergic sensitization and the inflammatory response, while IgE binding to CD23 is involved in the regulation of IgE synthesis and allergen transcytosis. Here we present the crystal structure of a CD23/IgE-Fc complex and conduct isothermal titration calorimetric binding studies. Two lectin-like "head" domains of CD23 bind to IgE-Fc with affinities that differ by more than an order of magnitude, but the crystal structure reveals only one head bound to one of the two identical heavy-chains in the asymmetrically bent IgE-Fc. These results highlight the subtle interplay between receptor binding sites in IgE-Fc and their affinities, the understanding of which may be exploited for therapeutic intervention in allergic disease.
Collapse
|
5
|
Fellmann M, Buschor P, Röthlisberger S, Zellweger F, Vogel M. High affinity targeting of CD23 inhibits IgE synthesis in human B cells. IMMUNITY INFLAMMATION AND DISEASE 2015; 3:339-49. [PMID: 26732048 PMCID: PMC4693728 DOI: 10.1002/iid3.72] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Revised: 05/19/2015] [Accepted: 06/08/2015] [Indexed: 12/17/2022]
Abstract
The low‐affinity IgE receptor FcϵRII (CD23) is part of the regulatory system controlling IgE synthesis in human B cells and exists in membrane and soluble forms. Binding of IgE to CD23 has been described to have stabilizing effects and to prevent cleavage of CD23. Previous experiments using anti‐CD23 antibodies reduced IgE synthesis but were difficult to interpret as the antibody Fc part might also mediate feedback mechanisms. The purpose of this study was to investigate the regulatory role of CD23, by using designed ankyrin repeat proteins (DARPins) that specifically recognize CD23. Anti‐CD23 DARPins were isolated by ribosome display and were produced as monovalent and bivalent constructs. Affinities to CD23 were measured by surface plasmon resonance. IgE synthesis and up‐regulation of CD23 in human peripheral B cells were induced by IL‐4 and anti‐CD40 antibody. We assessed CD23 expression and its stabilization by FACS and used an ELISA for detecting soluble CD23. IgE synthesis was measured by ELISA and real‐time PCR. Surface plasmon resonance revealed affinities of the DARPins to CD23 in the pico‐molar range. Anti‐CD23 DARPins strongly inhibited binding of IgE to CD23 and share thus a similar binding epitope as IgE. The DARPins stabilized membrane CD23 and reduced IgE synthesis in an isotype specific manner. Furthermore, the anti‐CD23 DARPins decreased IgE transcript through inhibition of mature Cϵ RNA synthesis suggesting a posttranscriptional control mechanism. This study demonstrates that targeting CD23 alone is sufficient to inhibit IgE synthesis and suggests that a negative signaling occurs directly through the CD23 molecule.
Collapse
Affiliation(s)
- Marc Fellmann
- Department of Immunology, University Clinic RIA University of Bern Inselspital Switzerland
| | - Patrick Buschor
- Department of Immunology, University Clinic RIA University of Bern Inselspital Switzerland
| | - Silvan Röthlisberger
- Department of Immunology, University Clinic RIA University of Bern Inselspital Switzerland
| | - Fabian Zellweger
- Department of Immunology, University Clinic RIA University of Bern Inselspital Switzerland
| | - Monique Vogel
- Department of Immunology, University Clinic RIA University of Bern Inselspital Switzerland
| |
Collapse
|
6
|
Chan MA, Gigliotti NM, Aubin BG, Rosenwasser LJ. FCER2 (CD23) asthma-related single nucleotide polymorphisms yields increased IgE binding and Egr-1 expression in human B cells. Am J Respir Cell Mol Biol 2014; 50:263-9. [PMID: 24010859 DOI: 10.1165/rcmb.2013-0112oc] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
CD23 is the low-affinity Fc receptor for IgE. When expressed on B cells, CD23 appears to play a role in regulation of IgE synthesis. Polymorphisms within FCER2, the gene encoding CD23, have been associated with atopy, increased risk of exacerbations in patients with asthma, and high serum IgE levels. A single-nucleotide polymorphism (rs2228137) present in exon 4 of FCER2 encodes a nonsynonymous amino acid change (R62W) and is the subject of the present analysis. Human B cell stable transfectants were established to characterize the functional relevance of the R62W SNP. We demonstrate that CD23b-R62W-expressing human B cells bind IgE with greater affinity than wild-type cells and display differences in kinetics of CD23-mediated ERK1/2 activation that may be responsible for the increased levels of Egr-1 mRNA observed after stimulation through CD23. Finally, the R62W SNP seems to alter the tertiary or quaternary structure of CD23 because in the absence of N-glycosylation the CD23b-R62W-expressing cells appear to be less sensitive to endogenous proteases. These observations may have implications in mechanisms responsible for the atopic phenotypes observed in patients with asthma who possess this genotype.
Collapse
Affiliation(s)
- Marcia A Chan
- Department of Pediatrics, Division of Immunology Research, Children's Mercy Hospitals & Clinics, Kansas City, Missouri
| | | | | | | |
Collapse
|
7
|
Padro CJ, Shawler TM, Gormley MG, Sanders VM. Adrenergic regulation of IgE involves modulation of CD23 and ADAM10 expression on exosomes. THE JOURNAL OF IMMUNOLOGY 2013; 191:5383-97. [PMID: 24140643 DOI: 10.4049/jimmunol.1301019] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Soluble CD23 plays a role in the positive regulation of an IgE response. Engagement of the β2 adrenergic receptor (β2AR) on a B cell is known to enhance the level of both soluble CD23 and IgE, although the mechanism by which this occurs is not completely understood. In this study, we report that, in comparison with a CD40 ligand/IL-4-primed murine B cell alone, β2AR engagement on a primed B cell increased gene expression of a disintegrin and metalloproteinase (ADAM)10, which is the primary sheddase of CD23, as well as protein expression of both CD23 and ADAM10, in a protein kinase A- and p38 MAPK-dependent manner, and promoted the localization of these proteins to exosomes as early as 2 d after priming, as determined by both Western blot and flow cytometry and confirmed by electron microscopy. In comparison with isolated exosomes released from primed B cells alone, the transfer of exosomes released from β2AR agonist-exposed primed B cells to cultures of recipient primed B cells resulted in an increase in the level of IgE produced per cell, without affecting the number of cells producing IgE, as determined by ELISPOT. These effects still occurred when a β2AR antagonist was added along with the transfer to block residual agonist, and they failed to occur when exosomes were isolated from β2AR-deficient B cells. These findings suggest that the mechanism responsible for mediating the β2AR-induced increase in IgE involves a shuttling of the β2AR-induced increase in CD23 and ADAM10 proteins to exosomes that subsequently mediate an increase in IgE.
Collapse
Affiliation(s)
- Caroline J Padro
- Biomedical Sciences Graduate Program, The Ohio State University Wexner College of Medicine, Columbus, OH 43210
| | | | | | | |
Collapse
|
8
|
Shiung YY, Chiang CY, Chen JB, Wu PC, Hung AFH, Lu DCS, Pan RL, Chang TW. An anti-IgE monoclonal antibody that binds to IgE on CD23 but not on high-affinity IgE.Fc receptors. Immunobiology 2012; 217:676-83. [DOI: 10.1016/j.imbio.2011.11.006] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2011] [Accepted: 11/18/2011] [Indexed: 11/25/2022]
|
9
|
Chan MA, Gigliotti NM, Meng J, Rosenwasser LJ. Asthma-related SNP in FCER2 is associated with increased expression of IL-4R on human B cells. Int J Immunogenet 2011; 38:533-8. [PMID: 22059556 DOI: 10.1111/j.1744-313x.2011.01043.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
A SNP (rs2228137) (R62W) in FCER2 has been linked with severe exacerbations in asthmatics. Transfectants expressing the SNP exhibited increased IL-4Rα expression after stimulation through CD23 compared with wild-type. Our data suggest that the SNP may favour increased IgE production through increased responsiveness to IL-4 in patients possessing this genotype.
Collapse
Affiliation(s)
- M A Chan
- Department of Pediatric Immunology, Children's Mercy Hospital, Kansas City, MO, USA.
| | | | | | | |
Collapse
|
10
|
Fucoidan suppresses IgE production in peripheral blood mononuclear cells from patients with atopic dermatitis. Arch Dermatol Res 2010; 303:425-31. [PMID: 21191796 DOI: 10.1007/s00403-010-1115-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2010] [Revised: 12/02/2010] [Accepted: 12/07/2010] [Indexed: 10/18/2022]
Abstract
We previously reported that fucoidan, a dietary fiber purified from seaweed, inhibited IgE production in B cells from mice spleen in vitro and ovalbumin-sensitized mice in vivo. In this study, we examined the effect of fucoidan on IgE production in human peripheral blood mononuclear cells (PBMC) in vitro. PBMC, obtained from healthy donors or patients with atopic dermatitis (AD) with high levels of serum IgE, were cultured with IL-4 and anti-CD40 antibody in the presence or absence of fucoidan. Fucoidan significantly reduced IgE production in PBMC without affecting cell proliferation and IFN-γ production. Fucoidan also inhibited immunoglobulin germline transcripts of B cells in PBMC, and decreased the number of IgE-secreting cells. The inhibitory effects of fucoidan were similarly observed for both PBMC from patients with AD and those with healthy donors. Our findings indicate that fucoidan suppresses IgE induction by inhibiting immunoglobulin class-switching to IgE in human B cells, even after the onset of AD.
Collapse
|
11
|
Mediation of apoptosis by and antitumor activity of lumiliximab in chronic lymphocytic leukemia cells and CD23+ lymphoma cell lines. Blood 2008; 111:1594-602. [DOI: 10.1182/blood-2007-03-082024] [Citation(s) in RCA: 61] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
AbstractLumiliximab is a chimeric macaque-human monoclonal antibody to CD23, a protein expressed on virtually all chronic lymphocytic leukemia (CLL) cells. We examined the ability of lumiliximab to mediate apoptosis, antibody-dependent cellular cytotoxicity, and complement-dependent cytotoxicity against primary CLL cells and CD23-expressing B-cell lines. Our data suggest that lumiliximab kills CLL cells and CD23-expressing B cells predominantly by apoptosis, which occurs through the intrinsic pathway. Lumiliximab-induced apoptosis was accompanied by the down-regulation of antiapoptotic proteins Bcl-2, Bcl-XL, and XIAP, activation of Bax, and release of cytochrome c from the mitochondria. We also found that the addition of lumiliximab to rituximab or fludarabine results in synergistic cytotoxicity of primary CLL cells and CD23-expressing B-cell lines. We investigated the in vivo activity of lumiliximab in a human disseminated CD23+ B-cell lymphoma SCID mouse model and found greater antitumor activity with it than with control antibody. We also found that paralysis-free survival was greater with lumiliximab plus rituximab or fludarabine than with any of those agents alone. These results suggest that lumiliximab may be an effective treatment alone or in combination with rituximab or chemotherapy agents in CLL or other CD23-overexpressing B-cell malignancies.
Collapse
|
12
|
Lin TS, Byrd JC. Chronic Lymphocytic Leukemia and Related Chronic Leukemias. Oncology 2007. [DOI: 10.1007/0-387-31056-8_65] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
|
13
|
Conrad DH, Ford JW, Sturgill JL, Gibb DR. CD23: an overlooked regulator of allergic disease. Curr Allergy Asthma Rep 2007; 7:331-7. [PMID: 17697638 DOI: 10.1007/s11882-007-0050-y] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Given the importance of immunoglobulin (Ig) E in mediating type I hypersensitivity, inhibiting IgE production would be a general way of controlling allergic disease. The low-affinity IgE receptor (FceRII or CD23) has long been proposed to be a natural regulator of IgE synthesis. In vivo research supporting this concept includes the observation that mice lacking CD23 have increased IgE production whereas mice overexpressing CD23 show strongly suppressed IgE responses. In addition, the finding that mice injected with monoclonal antibody directed against the coiled-coil stalk of CD23 have enhanced soluble CD23 release and increased IgE production demonstrates that full-length, trimeric CD23 is responsible for initiating an IgE inhibitory signal. The recent identification of ADAM10 (a disintegrin and metalloprotease) as the CD23 metalloprotease provides an alternative approach for designing therapies to combat allergic disease. Current data suggest that stabilizing cell-surface CD23 would be a natural means to decrease IgE synthesis and thus control type I hypersensitivity.
Collapse
Affiliation(s)
- Daniel H Conrad
- Department of Microbiology and Immunology, Virginia Commonwealth University, PO Box 980678, Richmond, VA 23298, USA.
| | | | | | | |
Collapse
|
14
|
Hagel I, Cabrera M, Hurtado MA, Sanchez P, Puccio F, Di Prisco MC, Palenque M. Infection by Ascaris lumbricoides and bronchial hyper reactivity: an outstanding association in Venezuelan school children from endemic areas. Acta Trop 2007; 103:231-41. [PMID: 17698018 DOI: 10.1016/j.actatropica.2007.06.010] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2007] [Revised: 06/28/2007] [Accepted: 06/29/2007] [Indexed: 10/23/2022]
Abstract
Asthma and other respiratory diseases have increased in the last years among Venezuelan children from helminthic endemic areas where the infection by Ascaris lumbricoides has been associated to bronchial airway inflammation in parasitized individuals. The aim of this work was to investigate the possible associations between the development of bronchial hyper reactivity and the immune response against A. lumbricoides in urban and rural children. We evaluated 470 school children from rural and urban communities. Pulmonary function tests were performed and >or=20% PC(20) changes were considered as a positive diagnostic of bronchial hyper reactivity. The prevalence and intensity of A. lumbricoides infection was determined by faecal examination. Specific serum IgE levels using a modified ELISA and skin prick tests against A. lumbricoides and the common allergen Dermatophagoides pteronyssinus were done. The number of circulating lymphocyte sub populations was determined by flow cytometry analysis. In rural children, bronchial hyper reactivity was associated with increased specific levels of anti-A. lumbricoides IgE (p<0.0001) and skin test positivity for A. lumbricoides (p<0.0001). The percentage of FEV1 predictive values correlated inversely (p<0.0001) with anti-A. lumbricoides IgE levels. Elevated numbers of circulating CD3+CD4+ and CD20+CD23+ cells were found in rural children with bronchial hyper reactivity compared to their asymptomatic counterparts. They correlated positively with anti-A. lumbricoides IgE levels (p<0.005 and <0.0001, respectively). In contrast, in urban children, bronchial hyper reactivity was associated with elevated anti-D. pteronyssinus IgE levels (p=0. 0089), skin hyper reactivity towards this aero allergen (p=0.003) and to an increase in the number of CD3+CD8+ (p<0.0001). Our results suggest that the IgE response against A. lumbricoides infection may be involved in the development of bronchial hyper reactivity among rural children from endemic areas and also that improved hygienic conditions in the urban environment is associated with increased responses to airborne allergens.
Collapse
Affiliation(s)
- I Hagel
- Institute of Biomedicine, Faculty of Medicine, Central University of Venezuela, Caracas, Venezuela.
| | | | | | | | | | | | | |
Collapse
|
15
|
McCloskey N, Hunt J, Beavil RL, Jutton MR, Grundy GJ, Girardi E, Fabiane SM, Fear DJ, Conrad DH, Sutton BJ, Gould HJ. Soluble CD23 monomers inhibit and oligomers stimulate IGE synthesis in human B cells. J Biol Chem 2007; 282:24083-91. [PMID: 17576766 DOI: 10.1074/jbc.m703195200] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
The low affinity IgE receptor, CD23, is implicated in IgE regulation and the pathogenesis of allergic disease. CD23 is a type II integral membrane protein, comprising a lectin "head," N-terminal "stalk," and C-terminal "tail" in the extracellular sequence. Endogenous proteases cleave CD23 in the stalk and the tail to release soluble fragments that either stimulate or inhibit IgE synthesis in human B cells. The molecular basis of these paradoxical activities is not understood. We have characterized three fragments of CD23, monomeric derCD23, monomeric exCD23, and oligomeric lzCD23. We show that the monomers inhibit and the oligomer stimulates IgE synthesis in human B cells after heavy chain switching to IgE. CD23 fragments could be targets for therapeutic intervention in allergic disease.
Collapse
Affiliation(s)
- Natalie McCloskey
- Medical Research Council Asthma UK Centre in Allergic Mechanisms of Asthma and the Randall Division of Cell and Molecular Biophysics, King's College London, New Hunt's House, Guy's Campus, London SE1 1UL, United Kingdom.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
16
|
Ford JW, Kilmon MA, Haas KM, Shelburne AE, Chan-Li Y, Conrad DH. In vivo murine CD23 destabilization enhances CD23 shedding and IgE synthesis. Cell Immunol 2006; 243:107-17. [PMID: 17324389 DOI: 10.1016/j.cellimm.2007.01.004] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2006] [Revised: 01/05/2007] [Accepted: 01/08/2007] [Indexed: 10/23/2022]
Abstract
To investigate the effects of in vivo CD23 destabilization on CD23 shedding and IgE production, an anti-CD23 stalk monoclonal (19G5), previously shown to enhance proteolysis of CD23 in vitro, was utilized. Compared to isotype control-treated mice, BALB/cJ mice injected with 19G5 displayed significantly enhanced serum soluble CD23 and IgE. Soluble CD23 and IgE levels were also increased in 19G5-treated C57BL/6J mice (intermediate IgE responders); however, the kinetics of the responses differed between the high (BALB/cJ) and intermediate responder mice, suggesting a potential role for CD23 in regulating IgE responder status. The 19G5-induced IgE response was dependent on IL-4 and independent of CD21 as demonstrated through use of IL-4Ralpha and CD21/35-deficient mice, respectively. Overall, the data provide a direct demonstration for CD23's role in regulating IgE production in vivo and suggest that therapies aimed at stabilizing cell surface CD23 would be beneficial in controlling allergic disease.
Collapse
Affiliation(s)
- Jill W Ford
- Department of Microbiology and Immunology, Virginia Commonwealth University, PO Box 980678, Richmond, VA 23298, USA.
| | | | | | | | | | | |
Collapse
|
17
|
Bharadwaj A, Agrawal DK. Immunomodulation in asthma: a distant dream or a close reality? Int Immunopharmacol 2005; 4:495-511. [PMID: 15099527 DOI: 10.1016/j.intimp.2004.02.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2003] [Revised: 01/27/2004] [Accepted: 02/01/2004] [Indexed: 11/21/2022]
Abstract
The search for new treatments of asthma or any other disease for that matter is an infinite exercise. The scope for discovering new forms of treatment has increased now more than ever due to a better understanding of the molecular pathogenesis of the disease. Regulation of biomolecular or immunological events could occur at numerous points in the disease pathogenesis. This review describes the strategies to regulate the inappropriate immune responses that are elicited after exposure to an allergen. One such successful therapy is treatment with omalizumab, the anti-IgE antibody. Other therapies include cytokine antagonists, transcription factor antagonists, immunostimulatory DNA therapy, cytokine therapy and anti-T cell strategies. All these agents have been shown to be promising and could serve as an alternative approach to the treatment of asthma and maybe other allergic diseases.
Collapse
Affiliation(s)
- Arpita Bharadwaj
- Department of Medical Microbiology and Immunology, Creighton University School of Medicine, Omaha, NE 68178, USA
| | | |
Collapse
|
18
|
Kilmon MA, Shelburne AE, Chan-Li Y, Holmes KL, Conrad DH. CD23 Trimers Are Preassociated on the Cell Surface Even in the Absence of Its Ligand, IgE. THE JOURNAL OF IMMUNOLOGY 2004; 172:1065-73. [PMID: 14707080 DOI: 10.4049/jimmunol.172.2.1065] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Allergic disease is mediated by high levels of allergen-specific IgE. IgE binding to CD23, the low affinity receptor for IgE, results in a negative feedback signal leading to a decrease in IgE production. Previous studies have shown that CD23 associates as an oligomer and that cooperative binding of at least two lectin domains is required for high affinity IgE binding to CD23. We have previously shown that cooperative binding is required for regulation of IgE production. This study describes the production of several mAbs that bind the stalk region of murine CD23. One of the Abs, 19G5, inhibited the IgE/CD23 interaction at 37 degrees C, but not at 4 degrees C. Analysis of the binding properties of these Abs revealed that CD23 dissociates at high temperatures, such as 37 degrees C; however, the N terminus is constitutively associated, indicating partial, rather than complete, dissociation. A novel finding was that the stalk region, previously thought to mediate trimer association, was not required for oligomerization. These data reveal important information about the structure of CD23 that may be useful in modulating IgE production.
Collapse
Affiliation(s)
- Michelle A Kilmon
- Department of Microbiology and Immunology, Virginia Commonwealth University, Richmond, VA 23298, USA
| | | | | | | | | |
Collapse
|
19
|
Lin TS, Byrd JC. Monoclonal antibody therapy in lymphoid leukemias. ADVANCES IN PHARMACOLOGY (SAN DIEGO, CALIF.) 2004; 51:127-67. [PMID: 15464908 DOI: 10.1016/s1054-3589(04)51006-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/30/2023]
Affiliation(s)
- Thomas S Lin
- Division of Hematology and Oncology, The Ohio State University, The Arthur James Comprehensive Cancer Center, Columbus, Ohio 43210, USA
| | | |
Collapse
|
20
|
Roever AC, Heine G, Zuberbier T, Worm M. Allergen-mediated modulation of CD23 expression is interferon-γ and interleukin-10 dependent in allergic and non-allergic individuals. Clin Exp Allergy 2003; 33:1568-75. [PMID: 14616870 DOI: 10.1046/j.1365-2222.2003.01797.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND CD23 plays an important role in IgE regulation. The modulation of CD23 expression during specific immunotherapy (SIT) has been described previously. In the present study, we investigated in detail the effects of complete birch pollen allergen extract (BPA) on CD23 expression of peripheral blood mononuclear cells (PBMCs) in vitro. METHODS PBMCs from 14 birch pollen-allergic (bp-allergic) patients and eight non-bp-allergic controls were stimulated with IL-4 and increasing doses of BPA. CD23 expression on monocytes and B cells was measured by flow cytometry; sCD23 release and the levels of IFN-gamma and IL-10 secretion were determined by ELISA. To analyse the mechanisms on CD23 expression in more detail, neutralizing anti-IFN-gamma and anti-IL-10 antibodies were added to IL-4 and BPA-stimulated cultures. RESULTS IL-4 induced CD23 expression on B cells and on monocytes and sCD23 release in the bp-allergic and non-bp-allergic groups. The addition of BPA to IL-4-stimulated PBMC decreased CD23 expression significantly and dose-dependently on B cells in both groups. CD23 expression on monocytes was also decreased in both groups after the addition of BPA, but higher doses were required in the non-bp-allergic population. IL-4-induced sCD23 release was also significantly decreased after the addition of BPA. IFN-gamma and IL-10 were induced by BPA in both the bp-allergic and non-bp-allergic groups. The addition of neutralizing anti-IFN-gamma antibodies increased CD23 expression on B cells, which were stimulated with IL-4 and BPA, but had no effect on monocytes, whereas the addition of anti-IL-10 antibodies increased CD23 expression on monocytes but not on B cells. CONCLUSION These data indicate that early immunological effects like down-regulation of CD23 on B cells and monocytes, which are observed during SIT are dose dependent, mediated by IFN-gamma and IL-10 and seem not to depend per se on the sensitization state of an individual.
Collapse
Affiliation(s)
- A C Roever
- Department of Dermatology and Allergy, Charité Campus Mitte, Humboldt University, Berlin, Germany
| | | | | | | |
Collapse
|
21
|
Geha RS, Jabara HH, Brodeur SR. The regulation of immunoglobulin E class-switch recombination. Nat Rev Immunol 2003; 3:721-32. [PMID: 12949496 DOI: 10.1038/nri1181] [Citation(s) in RCA: 316] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Immunoglobulin E (IgE) isotype antibodies are associated with atopic disease, namely allergic rhinitis, asthma and atopic dermatitis, but are also involved in host immune defence mechanisms against parasitic infection. The commitment of a B cell to isotype class switch to an IgE-producing cell is a tightly regulated process, and our understanding of the regulation of IgE-antibody production is central to the prevention and treatment of atopic disease. Both those that are presently in use and potential future therapies to prevent IgE-mediated disease take advantage of our existing knowledge of the specific mechanisms that are required for IgE class switching.
Collapse
Affiliation(s)
- Raif S Geha
- Division of Immunology, Children's Hospital and Department of Pediatrics, Harvard Medical School, Boston, Massachusetts 02115, USA.
| | | | | |
Collapse
|
22
|
Yamada T, Zhu D, Zhang K, Saxon A. Inhibition of interleukin-4-induced class switch recombination by a human immunoglobulin Fc gamma-Fc epsilon chimeric protein. J Biol Chem 2003; 278:32818-24. [PMID: 12801927 DOI: 10.1074/jbc.m304590200] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Immunoglobulin E (IgE) is important in mediating human allergic diseases. We tested the hypothesis that a human Ig Fc gamma-Fc epsilon bifunctional chimeric protein, GE2, would inhibit IgE class switch recombination (CSR) by co-aggregating B-cell CD32 and CD23. Indeed, GE2 directly inhibited epsilon germ-line transcription, subsequent CSR to epsilon and IgE protein production. This CSR inhibition was dependent on CD23 binding and the phosphorylation of extracellular signal-related kinase (ERK), and it was mediated via suppression of interleukin-4-induced STAT6 phosphorylation. Treatment with PD98059, a specific inhibitor of mitogen-activated protein kinase kinase 1 (MAPKK1 (MEK1)) and MEK2 reversed the ability of GE2 to decrease CSR and STAT6 phosphorylation. GE2 stimulation induced ERK phosphorylation, whereas it did not alter the phosphorylation of c-Jun N-terminal kinase or p38 MAPK. The ability of GE2 to block human isotype switching to epsilon, in addition to its already demonstrated ability to inhibit mast cell and basophil function, suggests that it will provide an important novel benefit in the treatment of IgE-mediated diseases.
Collapse
MESH Headings
- Blotting, Western
- Cells, Cultured
- Densitometry
- Enzyme Inhibitors/pharmacology
- Flavonoids/pharmacology
- Humans
- Immunoglobulin Class Switching
- Immunoglobulin E/chemistry
- Immunoglobulin Variable Region/chemistry
- Interleukin-4/antagonists & inhibitors
- Interleukin-4/metabolism
- JNK Mitogen-Activated Protein Kinases
- Leukocytes, Mononuclear/metabolism
- MAP Kinase Kinase 1
- MAP Kinase Kinase 2
- Mitogen-Activated Protein Kinase Kinases/metabolism
- Mitogen-Activated Protein Kinases/metabolism
- Models, Biological
- Phosphorylation
- Polymerase Chain Reaction
- Protein Serine-Threonine Kinases/metabolism
- Protein Structure, Tertiary
- Protein-Tyrosine Kinases/metabolism
- RNA/metabolism
- Receptors, IgE/biosynthesis
- Receptors, IgE/metabolism
- Receptors, IgG/biosynthesis
- Recombinant Fusion Proteins/chemistry
- Recombinant Fusion Proteins/metabolism
- Recombination, Genetic
- Reverse Transcriptase Polymerase Chain Reaction
- STAT6 Transcription Factor
- Time Factors
- Trans-Activators/metabolism
- Transcription, Genetic
- p38 Mitogen-Activated Protein Kinases
Collapse
Affiliation(s)
- Takechiyo Yamada
- Hart and Louis Laboratory, Division of Clinical Immunology, Department of Medicine, UCLA School of Medicine, California 90095-1680, USA.
| | | | | | | |
Collapse
|