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Ramos‐Martinez E, García‐Vazquez FJ, Falfán‐Valencia R, Rojas‐Serrano J, Alfaro‐Cruz A, Pérez‐Villaseñor M, Aristi‐Urista G, Pérez‐Hernández J, López‐Vancell R, Velasco‐Medina A, Velázquez‐Sámano G. The type 2 inflammatory response favors recognition of tumor antigens by IgE in breast cancer. Cancer Rep (Hoboken) 2024; 7:e2002. [PMID: 38389406 PMCID: PMC10884619 DOI: 10.1002/cnr2.2002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2023] [Revised: 12/30/2023] [Accepted: 02/05/2024] [Indexed: 02/24/2024] Open
Abstract
BACKGROUND Several studies describe an inverse statistical relationship between the presence of an allergy and development of cancer. However, the immunological mechanism involved in the relationship between these two degenerative diseases has not been explored. AIMS The main objective of this study was to explore the possibility that the lymphocyte T helper (Th) 2 response, a characteristic of allergy, induces recognition of tumor antigens. METHODS AND RESULTS Patients with a clinical diagnosis of breast ductal carcinoma were included. Histopathological markers related to proliferation of tumor cells were determined (Her-2-neu, Ki-67, estrogen receptor, and progesterone receptor). IHC was performed using IgE antibodies purified from an allergy patient and from each biopsy donor patient. Serum concentrations of cytokines representative of Th1 and Th2 inflammatory responses were determined. A total of 14 patients with a confirmed diagnosis of breast ductal carcinoma were included. IHC performed on biopsies showed a weak response when using purified IgE antibodies from an allergy patient; however, IHC using the IgE of each patient as the primary antibody showed an intense and highly specific signal. Serum concentrations of cytokines of the Th2 response, that is, IL-4 (130.5 pg/mL (116-135 pg/mL)), IL-5 (202 pg/mL (191-213 pg/mL)), and IL-13 (105.5 pg/mL (98-117 pg/mL)), were significantly higher than those of the Th1 response, that is, IL-6 (86 pg/mL (79-90 pg/mL)) and INF-γ (93 pg/mL (79-99 pg/mL)). CONCLUSION Purified IgE antibodies specifically recognize tumor cells in breast ductal carcinoma.
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Affiliation(s)
- Espiridión Ramos‐Martinez
- Unidad de Medicina Experimental, Facultad de MedicinaUniversidad Nacional Autónoma de MéxicoMexico cityMexico
| | - Francisco Javier García‐Vazquez
- Departamento de Análisis Clínicos y Estudios EspecialesInstituto Nacional de Pediatría, Laboratorio de Inmunogenética MolecularMexico cityMexico
| | - Ramcés Falfán‐Valencia
- HLA LaboratoryInstituto Nacional de Enfermedades Respiratorias Ismael Cosío VillegasMexico cityMexico
| | - Jorge Rojas‐Serrano
- Unidad de Enfermedades del Intersticio Pulmonar y Reumatología, Instituto Nacional de Enfermedades Respiratorias, “Ismael Cosío Villegas”Mexico cityMexico
| | - Ana Alfaro‐Cruz
- Patología Quirúrgica, Servicio de Anatomía Patológica, Hospital General de México, “Dr. Eduardo Liceaga”Mexico CityMexico
| | | | - Gerardo Aristi‐Urista
- Patología Quirúrgica, Servicio de Anatomía Patológica, Hospital General de México, “Dr. Eduardo Liceaga”Mexico CityMexico
| | - Jesús Pérez‐Hernández
- Unidad de Medicina Experimental, Facultad de MedicinaUniversidad Nacional Autónoma de MéxicoMexico cityMexico
| | - Rosario López‐Vancell
- Unidad de Medicina Experimental, Facultad de MedicinaUniversidad Nacional Autónoma de MéxicoMexico cityMexico
| | - Andrea Velasco‐Medina
- Servicio de Alergia e Inmunología Clínica, Hospital General de México, “Dr. Eduardo Liceaga”Mexico CityMexico
| | - Guillermo Velázquez‐Sámano
- Servicio de Alergia e Inmunología Clínica, Hospital General de México, “Dr. Eduardo Liceaga”Mexico CityMexico
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Badloe FMS, De Vriese S, De Bruyn Carlier T, Vandersichel E, Scheffel J, Maurer M, Ring J, Gutermuth J, Kortekaas Krohn I. A Novel Method for Total IgE Purification from Human Serum. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2022; 208:2436-2442. [PMID: 35523453 DOI: 10.4049/jimmunol.2100497] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 03/17/2022] [Indexed: 06/14/2023]
Abstract
For Ab purification, high-affinity chromatography is commonly used. This technique results in high-purity Abs, but it requires highly specific knowledge and equipment. Commercial kits for purification of IgE are not available. Therefore, we established a (to our knowledge) novel method for the purification of total IgE from human serum. Sera from 19 allergic and nonallergic patients were included. After depletion of polyclonal IgG, total serum IgE was captured using anti-human IgE Abs coupled to beads, eluted from the beads, and incubated with protein G-coupled beads to increase the final purity. Purity analysis and Ab detection were performed by Western blot. Total serum IgE and purified IgE concentrations were analyzed using ELISA. To determine their functionality, primary human mast cells were sensitized with purified IgE and activated with anti-IgE or a relevant allergen. CD63+ expression and histamine release were used as readout parameters. Concentrations of purified total IgE corresponded with the levels of total serum IgE. Minor fractions of IgE remained attached to the beads, confirming an effective elution of IgE Abs. Only minimal amounts of IgG were found in the purified IgE fractions, confirming a high purity of IgE. Mast cells sensitized with purified IgE and subsequent activation with anti-IgE Ab or a relevant allergen showed increased expression of CD63+ and increased histamine release. This (to our knowledge) novel method represents a highly effective and widely accessible approach for purification of human serum IgE, which can improve the use of IgE-based in vivo and in vitro models and contribute to allergy research.
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Affiliation(s)
- Fariza Mishaal Saiema Badloe
- Vrije Universiteit Brussel (VUB), SKIN Research Group, Brussels, Laarbeeklaan 103, 1090 Belgium
- Vrije Universiteit Brussel (VUB), Universitair Ziekenhuis Brussel (UZ Brussel), Department of Dermatology, Laarbeeklaan 101, 1090 Brussels, Belgium
| | - Shauni De Vriese
- Vrije Universiteit Brussel (VUB), SKIN Research Group, Brussels, Laarbeeklaan 103, 1090 Belgium
- Institute of Allergology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
| | - Tina De Bruyn Carlier
- Vrije Universiteit Brussel (VUB), SKIN Research Group, Brussels, Laarbeeklaan 103, 1090 Belgium
| | - Elise Vandersichel
- Vrije Universiteit Brussel (VUB), Universitair Ziekenhuis Brussel (UZ Brussel), Department of Dermatology, Laarbeeklaan 101, 1090 Brussels, Belgium
| | - Jörg Scheffel
- Institute of Allergology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- Fraunhofer Institute for Translational Medicine and Pharmacology, Allergology and Immunology, Berlin, Germany; and
| | - Marcus Maurer
- Institute of Allergology, Charité-Universitätsmedizin Berlin, corporate member of Freie Universität Berlin and Humboldt-Universität zu Berlin, Berlin, Germany
- Fraunhofer Institute for Translational Medicine and Pharmacology, Allergology and Immunology, Berlin, Germany; and
| | - Johannes Ring
- Department of Dermatology and Allergology Biederstein, Technical University Munich, Munich, Germany
| | - Jan Gutermuth
- Vrije Universiteit Brussel (VUB), SKIN Research Group, Brussels, Laarbeeklaan 103, 1090 Belgium
- Vrije Universiteit Brussel (VUB), Universitair Ziekenhuis Brussel (UZ Brussel), Department of Dermatology, Laarbeeklaan 101, 1090 Brussels, Belgium
| | - Inge Kortekaas Krohn
- Vrije Universiteit Brussel (VUB), SKIN Research Group, Brussels, Laarbeeklaan 103, 1090 Belgium;
- Vrije Universiteit Brussel (VUB), Universitair Ziekenhuis Brussel (UZ Brussel), Department of Dermatology, Laarbeeklaan 101, 1090 Brussels, Belgium
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Porcine IgE in the context of experimental food allergy: Purification and isotype-specific antibodies. Vet Immunol Immunopathol 2008; 125:303-14. [DOI: 10.1016/j.vetimm.2008.05.028] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2008] [Revised: 05/21/2008] [Accepted: 05/30/2008] [Indexed: 12/25/2022]
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Xie L, Schroeder JT, Langdon JM, Sora-Scott RS, Kawakami T, MacDonald SM. Human IgE+ and IgE- are not equivalent to mouse highly cytokinergic IgE. J Allergy Clin Immunol 2008; 121:1027-33. [PMID: 18234322 DOI: 10.1016/j.jaci.2007.12.1157] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2007] [Revised: 11/15/2007] [Accepted: 12/17/2007] [Indexed: 11/19/2022]
Abstract
BACKGROUND We have previously defined IgE+ as the IgE on basophils from a subset of highly allergic asthmatic subjects that release histamine after stimulation with histamine-releasing factor (HRF). The mechanism of IgE+ remains an enigma. Recently, there have been reports of monomeric highly cytokinergic IgEs causing mediator release, cytokine release, and phosphorylation events in cultured rodent and human mast cells in the absence of antigen. OBJECTIVE We investigated whether human IgE+ might exist as highly cytokinergic IgE in the human system. METHODS IgE+ was defined as causing greater than 10% histamine release by using HRF as a stimulus of human basophils. By definition, IgE- did not support histamine release to HRF. Once defined, serum and various purified human IgEs were used to stimulate purified human basophils or cultured human mast cells. The cells were examined for histamine release, extracellular signal-regulated kinase (ERK) phosphorylation, and IL-13 secretion. RESULTS We found that neither IgE+ nor IgE- induced ERK phosphorylation, histamine release, and IL-13 release from freshly isolated basophils in the absence of a specific antigen. However, human IgE alone did stimulate ERK phosphorylation in cultured human mast cells and IL-3-primed human basophils. CONCLUSION Human IgE+ is not an equivalent of the mouse highly cytokinergic IgE. However, human IgE did have effects on cultured mast cells and basophils. The effect of highly cytokinergic IgE on ERK phosphorylation and cytokine secretion might be due to the priming effect of human basophils and mast cells.
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Affiliation(s)
- Liping Xie
- Johns Hopkins Asthma and Allergy Center at Johns Hopkins University School of Medicine, Baltimore, MD, USA
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Fairley JA, Burnett CT, Fu CL, Larson DL, Fleming MG, Giudice GJ. A pathogenic role for IgE in autoimmunity: bullous pemphigoid IgE reproduces the early phase of lesion development in human skin grafted to nu/nu mice. J Invest Dermatol 2007; 127:2605-11. [PMID: 17611576 DOI: 10.1038/sj.jid.5700958] [Citation(s) in RCA: 120] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Bullous pemphigoid (BP) is an autoimmune disease characterized by subepidermal blistering. Based on previous work, IgG autoantibodies directed against BP180 are thought to be the primary pathogenic agent in BP. In addition to these IgG autoantibodies, however, most BP patients produce IgE class autoantibodies that also react with BP180, and total IgE levels are often elevated in this disease. To directly test whether BP IgE is pathogenic, 6 ng of total IgE isolated from two BP and two normal sera were injected into human skin grafted onto athymic, nude mice. Twenty-four hours after injection, erythematous, elevated plaques were observed in all human skin grafts receiving BP IgE (n=11), but not control IgE (n=9). Histologic and ultrastructural examination of the lesions showed engorgement of blood vessels and a dermal infiltrate composed of neutrophils, eosinophils, and mast cells, many of which were degranulated. At a higher dose of BP IgE (47 ng), histological separation of the epidermis from the dermis was observed in two of the three grafts. The BP IgE-induced erythematous plaques were reminiscent of those clinically seen in BP. This provides early evidence of a direct demonstration of a pathogenic role for IgE class autoantibodies in a human autoimmune disease.
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Affiliation(s)
- Janet A Fairley
- Department of Dermatology, Medical College of Wisconsin, Milwaukee, Wisconsin, USA.
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Yada A, Ebihara S, Matsumura K, Endo S, Maeda T, Nakamura A, Akiyama K, Aiba S, Takai T. Accelerated antigen presentation and elicitation of humoral response in vivo by FcγRIIB- and FcγRI/III-mediated immune complex uptake. Cell Immunol 2003; 225:21-32. [PMID: 14643301 DOI: 10.1016/j.cellimm.2003.09.008] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
It is well established that activating-type Fc receptors for IgG (FcgammaR), such as FcgammaRI and FcgammaRIII, are essential for inducing inflammatory responses, whereas a unique inhibitory FcgammaR, FcgammaRIIB, inhibits intracellular signaling upon ligation of IgG-immune complexes, and can suppress inflammation and autoimmunity. Although antigen presentation is a crucial step for evoking inflammatory responses, the contribution of FcgammaRIIB to antigen presentation is controversial as to whether it regulates antigen-presenting cells (APC), particularly dendritic cells (DC), positively or negatively. In the present report, we show that the antigen targeting to both activating-type FcgammaRs, FcgammaRI/III, and inhibitory FcgammaRIIB on bone marrow-derived DC and macrophages and primary epidermal Langerhans' cells augmented T cell proliferation in vitro and elicited humoral responses upon adoptive transfer of the antigen-pulsed DC. The DC lacking FcgammaRIIB showed a reduction in IC-uptake ability and a decreased T-cell stimulation, and induced less efficient IgG production than those of DC from wild-type mice. On the other hand, the DC lacking FcR common gamma subunit, which only expresses FcgammaRIIB, showed significant up-regulations of IC-uptake, T-cell proliferation, and IgG production compared to those of FcgammaR null DC, demonstrating a positive regulation of FcgammaRIIB for the efficient antigen presentation of IgG-complexed antigens. These results support the therapeutic benefits of antigen-targeting to FcgammaR on APC in the various inflammatory disorders.
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Affiliation(s)
- Ayumi Yada
- Department of Experimental Immunology and the CREST Program of Japan Science and Technology Corporation, Institute of Development, Aging and Cancer, Tohoku University, 980-8575, Sendai, Japan
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Makabe-Kobayashi Y, Hori Y, Adachi T, Ishigaki-Suzuki S, Kikuchi Y, Kagaya Y, Shirato K, Nagy A, Ujike A, Takai T, Watanabe T, Ohtsu H. The control effect of histamine on body temperature and respiratory function in IgE-dependent systemic anaphylaxis. J Allergy Clin Immunol 2002; 110:298-303. [PMID: 12170272 DOI: 10.1067/mai.2002.125977] [Citation(s) in RCA: 105] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
BACKGROUND The systemic anaphylaxis reaction comprises various symptoms, including hypotension, changes in respiration pattern, and hypothermia. OBJECTIVE To elucidate the role of histamine in each of these symptoms, we induced the passive systemic anaphylaxis reaction in histidine decarboxylase gene knockout (HDC [-/-]) mice, which lack histamine. METHODS HDC(-/-) mice were generated by knocking out the HDC gene, which codes for the unique histamine-synthesizing enzyme. Twenty-four hours after the injection of IgE, HDC(+/+) and HDC(-/-) mice were injected with allergen and body temperature, blood pressure, and respiratory function were monitored in each mouse. RESULTS Blood pressure dropped in both the HDC(-/-) mice and the HDC(+/+) mice. In contrast, respiratory frequency dropped and the expiratory respiration time was elongated only in the HDC(+/+) mice. Body temperature was decreased in the HDC(+/+) mice and was practically unchanged in the HDC(-/-) mice. Histamine receptor antagonists blocked the body temperature drop in the HDC(+/+) mice. Intravenous histamine induced similar patterns of body temperature decrease in the HDC(+/+) mice and the HDC(-/-) mice. Mast cell-deficient W/W (v) mice did not show the decrease in body temperature; this suggests that the histamine that contributed to the decrease in body temperature was derived from mast cells. CONCLUSION According to the results of this investigation, in the passive systemic anaphylaxis reaction, respiratory frequency, expiratory time, and body temperature are shown to be controlled by the activity of histamine, but its contribution to blood pressure is negligible.
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Affiliation(s)
- Yoko Makabe-Kobayashi
- Department of Cellular Pharmacology, Tohoku University Graduate School of Medicine, Seiryo-cho 2-1, Aoba-ku, Sendai 980-8575, Japan
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Ujike A, Ishikawa Y, Ono M, Yuasa T, Yoshino T, Fukumoto M, Ravetch JV, Takai T. Modulation of immunoglobulin (Ig)E-mediated systemic anaphylaxis by low-affinity Fc receptors for IgG. J Exp Med 1999; 189:1573-9. [PMID: 10330436 PMCID: PMC2193631 DOI: 10.1084/jem.189.10.1573] [Citation(s) in RCA: 146] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
It is widely accepted that immunoglobulin (Ig)E triggers immediate hypersensitivity responses by activating a cognate high-affinity receptor, FcepsilonRI, leading to mast cell degranulation with release of vasoactive and proinflammatory mediators. This apparent specificity, however, is complicated by the ability of IgE to bind with low affinity to Fc receptors for IgG, FcgammaRII and III. We have addressed the in vivo significance of this interaction by studying IgE-mediated passive systemic anaphylaxis in FcgammaR-deficient mice. Mice deficient in the inhibitory receptor for IgG, FcgammaRIIB, display enhanced IgE-mediated anaphylactic responses, whereas mice deficient in an IgG activation receptor, FcgammaRIII, display a corresponding attenuation of IgE-mediated responses. Thus, in addition to modulating IgG-triggered hypersensitivity responses, FcgammaRII and III on mast cells are potent regulators of IgE-mediated responses and reveal the existence of a regulatory pathway for IgE triggering of effector cells through IgG Fc receptors that could contribute to the etiology of the atopic response.
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Affiliation(s)
- A Ujike
- Department of Experimental Immunology, Institute of Development, Aging and Cancer, Tohoku University, Sendai 980-8575, Japan
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Wantke F, MacGlashan DW, Langdon JM, MacDonald SM. The human recombinant histamine releasing factor: functional evidence that it does not bind to the IgE molecule. J Allergy Clin Immunol 1999; 103:642-8. [PMID: 10200014 DOI: 10.1016/s0091-6749(99)70237-x] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND We have previously shown that the human recombinant histamine releasing factor (HrHRF) caused histamine release from a subset of basophils from donors with allergy, and this release seemed to be dependent on the presence of a certain type of IgE, termed IgE+. IgE molecules that did not support HrHRF-induced histamine release were termed IgE-. However, subsequently we demonstrated that HrHRF primes anti-IgE-antibody-induced histamine release from all basophils, irrespective of the type of IgE on the cell surface. OBJECTIVE Because these data suggested that HrHRF does not exert its biologic effects by binding to IgE, but rather that it interacted with a surface receptor on the basophil, we wanted to obtain functional evidence that HrHRF did or did not bind to the IgE molecule. METHODS The rat basophilic leukemia cell line (RBL-SX38), which has been transfected to express a functional human FcepsilonRI (alpha-, beta-, and gamma-chains of the receptor) in addition to the normal rat FcepsilonRI, was used. The presence of the human FcepsilonRI receptor enables these cells to be sensitized with human IgE. Cells were passively sensitized with 1000 ng/mL human IgE+ or 1000 ng/mL human IgE- for 60 minutes at 37 degrees C. Unsensitized cells served as a control. After the cells were washed, 1 x l0(5) cells were stimulated in the presence of 1 mmol/L Ca2+ with 0.1 microg/mL anti-IgE, 40 microg/mL HrHRF, or 40 microg/mL mouse recombinant HRF (MrHRF), which has 96% homology to HrHRF. RESULTS Mean anti-IgE-induced histamine release was 33% +/- 15%, and there was no difference between IgE+ sensitization (32% +/- 12%) and IgE- sensitization (34% +/- 18%). However, in contrast to human basophil experiments, neither HrHRF (0% +/- 0%) nor MrHRF (3% +/- 5%) caused histamine release in RBL cells sensitized with IgE+. In addition, priming the transfected RBL-SX38 cells or the parental cell line, RBL-2H3 cells, with HrHRF or MrHRF did not increase anti-IgE-induced histamine release. CONCLUSION The results indicate that HrHRF does not bind to IgE, either IgE+ or IgE-. Therefore it appears likely that rHRF signals through its own specific receptor, which is not expressed or functional on RBL-SX38 or RBL-2H3 cells, but which seems to be expressed on basophils of atopic and nonatopic donors.
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Affiliation(s)
- F Wantke
- Johns Hopkins Asthma & Allergy Center, Baltimore, MD 21224, USA
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Abstract
The clinical immunology laboratory provides support to the allergist in the diagnosis and management of human allergic diseases. Following a clinical history, the detection of allergen-specific immunoglobulin E (IgE) in serum can be useful in the definitive diagnosis of an IgE antibody-mediated hypersensitivity. Total serum IgE, the multiallergen screen, and mast cell tryptase are less commonly measured analytes in the work-up of the allergic patient. More recently, the clinical laboratory has employed monoclonal antibody based-enzyme immunoassays to quantify dust mite, cat, dog, and cockroach indicator aeroallergen levels in indoor home and work environments. Levels of allergenic proteins in environmental and medical/consumer products are measured by other assays such as the competitive inhibition radioallergosorbent test. Methods of quantification, internal quality control, and external proficiency testing programs are emphasized in this report.
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Affiliation(s)
- R G Hamilton
- Johns Hopkins Asthma and Allergy Center, Johns Hopkins University School of Medicine, Baltimore, Maryland 21224, USA
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Shaw RJ, Grimmett DJ, Donaghy MJ, Gatehouse TK, Shirer CL, Douch PG. Production and characterisation of monoclonal antibodies recognising ovine IgE. Vet Immunol Immunopathol 1996; 51:235-51. [PMID: 8792563 DOI: 10.1016/0165-2427(95)05530-4] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Two monoclonal antibodies (mAbs), XB6 and YD3, which recognise ovine immunoglobulin E (IgE) were produced. Mast cells isolated from ovine intestinal mucosa were used as a source of IgE to immunize mice. Culture supernatants of hybridomas were screened by immunoassays on small-intestine tissue sections, isolated mucosal cells, and dot blots of lysed mast cell homogenate. Two mAbs were chosen for their specific binding to mast cells. Antigen bound by these mAbs was purified by immunoaffinity chromatography using XB6 mAb, and this produced two bands consistent with IgE heavy chain (86,000 Daltons) and immunoglobulin light chain (28,000 Daltons) when run under reducing conditions on SDS-PAGE gels. Purified IgE was shown on dot blots to react weakly with mAb to chimeric ovine IgE and strongly to polyclonal anti-sheep antibodies. The two mAbs induced an immediate hypersensitivity-like reaction when injected into the skin of sheep. The mAbs bound to mast cells and other mononuclear cells, presumably IgE-secreting B-cells in mesenteric lymph node sections. These mAbs proved useful for detecting IgE-bearing cells in various ovine tissues, for purifying mast cells from cell isolates by panning and immunomagnetic bead separation, for purifying serum IgE using immunoaffinity chromatography and for detecting IgE in an ELISA. Competitive binding assays showed that the two mAbs bind to different epitopes on IgE. These mAbs will be useful in research applications and in diagnostic assays.
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Affiliation(s)
- R J Shaw
- AgResearch, Wallaceville Animal Research Centre, Upper Hutt, New Zealand
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