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Lin CW, Canonica F, Wüthrich S, Fettelschoss-Gabriel A, Schlapbach R, Nanni P. m-nitrobenzyl alcohol supercharging reagent enhances the chromatographic separation and the charging of disulfide bond linked and His-tag peptides. J Chromatogr A 2024; 1722:464828. [PMID: 38581973 DOI: 10.1016/j.chroma.2024.464828] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 02/27/2024] [Accepted: 03/20/2024] [Indexed: 04/08/2024]
Abstract
The linkages of disulfide bond (DSB) play important roles in protein stability and activity. Mass spectrometry-based (MS-based) techniques become accepted tools for DSB analysis in the recent decade. In the bottom-up approach, after enzyme digestion, the neighbouring amino acids of cysteines have great impacts on the physicochemical properties of resulting disulfide bond peptides, determining their retention behaviour on liquid chromatography (LC) and their MS ionization efficiency. In this study, the addition of supercharging reagent in LC mobile phase was used to examine the impact of supercharging reagent on the charge states of disulfide-bond peptides. The results showed that 0.1 % m-nitrobenzyl alcohol (m-NBA) in LC mobile phase increased the sensitivity and charge states of DSB peptides from our model protein, equine Interleukin-5 (eIL5), as well as the resolution of reversed-phase chromatography. Notably, also the sensitivity of C-terminal peptide with His-tag significantly improved. Our findings highlight the effectiveness of employing m-NBA as a supercharging reagent when investigating disulfide-linked peptides and the C-terminal peptide with a His-tag through nano-liquid chromatography mass spectrometry.
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Affiliation(s)
- Chia-Wei Lin
- Functional Genomics Center Zürich, University of Zürich/ETH Zürich, 8057 Zürich, Switzerland.
| | - Fabia Canonica
- Department of Dermatology, University of Zürich, 8952 Schlieren, Switzerland
| | - Simone Wüthrich
- Functional Genomics Center Zürich, University of Zürich/ETH Zürich, 8057 Zürich, Switzerland
| | | | - Ralph Schlapbach
- Functional Genomics Center Zürich, University of Zürich/ETH Zürich, 8057 Zürich, Switzerland
| | - Paolo Nanni
- Functional Genomics Center Zürich, University of Zürich/ETH Zürich, 8057 Zürich, Switzerland
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2
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Raza F, Babasyan S, Larson EM, Freer HS, Schnabel CL, Wagner B. Peripheral blood basophils are the main source for early interleukin-4 secretion upon in vitro stimulation with Culicoides allergen in allergic horses. PLoS One 2021; 16:e0252243. [PMID: 34038479 PMCID: PMC8153460 DOI: 10.1371/journal.pone.0252243] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Accepted: 05/11/2021] [Indexed: 12/22/2022] Open
Abstract
Interleukin-4 (IL-4) is a key cytokine secreted by type 2 T helper (Th2) cells that orchestrates immune responses during allergic reactions. Human and mouse studies additionally suggest that basophils have a unique role in the regulation of allergic diseases by providing initial IL-4 to drive T cell development towards the Th2 phenotype. Equine Culicoides hypersensitivity (CH) is a seasonal immunoglobulin E (IgE)-mediated allergic dermatitis in horses in response to salivary allergens from Culicoides (Cul) midges. Here, we analyzed IL-4 production in peripheral blood mononuclear cells (PBMC) of CH affected (n = 8) and healthy horses (n = 8) living together in an environment with natural Cul exposure. During Cul exposure when allergic horses had clinical allergy, IL-4 secretion from PBMC after stimulation with Cul extract was similar between healthy and CH affected horses. In contrast, allergic horses had higher IL-4 secretion from PBMC than healthy horses during months without allergen exposure. In addition, allergic horses had increased percentages of IL-4+ cells after Cul stimulation compared to healthy horses, while both groups had similar percentages of IL-4+ cells following IgE crosslinking. The IL-4+ cells were subsequently characterized using different cell surface markers as basophils, while very few allergen-specific CD4+ cells were detected in PBMC after Cul extract stimulation. Similarly, IgE crosslinking by anti-IgE triggered basophils to produce IL-4 in all horses. PMA/ionomycin consistently induced high percentages of IL-4+ Th2 cells in both groups confirming that T cells of all horses studied were capable of IL-4 production. In conclusion, peripheral blood basophils produced high amounts of IL-4 in allergic horses after stimulation with Cul allergens, and allergic horses also maintained higher basophil percentages throughout the year than healthy horses. These new findings suggest that peripheral blood basophils may play a yet underestimated role in innate IL-4 production upon allergen activation in horses with CH. Basophil-derived IL-4 might be a crucial early signal for immune induction, modulating of immune responses towards Th2 immunity and IgE production.
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Affiliation(s)
- Fahad Raza
- Departments of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York, United States of America
| | - Susanna Babasyan
- Departments of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York, United States of America
| | - Elisabeth M. Larson
- Departments of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York, United States of America
| | - Heather S. Freer
- Departments of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York, United States of America
| | - Christiane L. Schnabel
- Departments of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York, United States of America
| | - Bettina Wagner
- Departments of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, New York, United States of America
- * E-mail:
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3
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Cul o 2 specific IgG3/5 antibodies predicted Culicoides hypersensitivity in a group imported Icelandic horses. BMC Vet Res 2020; 16:283. [PMID: 32778104 PMCID: PMC7418374 DOI: 10.1186/s12917-020-02499-w] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2019] [Accepted: 07/27/2020] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Culicoides hypersensitivity (CH) is induced in horses by salivary allergens of Culicoides midges. In Iceland, the causal Culicoides species for CH are not present. Previous epidemiological data indicated that Icelandic horses are more susceptible to CH when they are exported from Iceland and first exposed to Culicoides at adult age. Horses born in countries where Culicoides is endemic, develop the disease less frequently. Here, we established a longitudinal allergy model to identify predictive and diagnostic serological biomarkers of CH. RESULTS Sixteen adult Icelandic horses from Iceland were imported to the Northeastern United States (US) during the winter and were kept in the same environment with natural Culicoides exposure for the next two years. None of the horses showed clinical allergy during the first summer of Culicoides exposure. In the second summer, 9/16 horses (56%) developed CH. Allergen specific IgE and IgG isotype responses in serum samples were analysed using nine potential Culicoides allergens in a fluorescent bead-based multiplex assay. During the first summer of Culicoides exposure, while all horses were still clinically healthy, Cul o 2 specific IgG3/5 antibodies were higher in horses that developed the allergic disease in the second summer compared to those that did not become allergic (p = 0.043). The difference in Cul o 2 specific IgG3/5 antibodies between the two groups continued to be detectable through fall (p = 0.035) and winter of the first year. During the second summer, clinical signs first appeared and Cul o 3 specific IgG3/5 isotypes were elevated in allergic horses (p = 0.041). Cul o 2 specific IgG5 (p = 0.035), and Cul o 3 specific IgG3/5 (p = 0.043) were increased in late fall of year two when clinical signs started to improve again. CONCLUSIONS Our results identified IgG5 and IgG3/5 antibodies against Cul o 2 and Cul o 3, respectively, as markers for CH during and shortly after the allergy season in the Northeastern US. In addition, Cul o 2 specific IgG3/5 antibodies may be valuable as a predictive biomarker of CH in horses that have been exposed to Culicoides but did not yet develop clinical signs.
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Cox A, Wood K, Coleman G, Stewart AJ, Bertin FR, Owen H, Suen WW, Medina-Torres CE. Essential oil spray reduces clinical signs of insect bite hypersensitivity in horses. Aust Vet J 2020; 98:411-416. [PMID: 32761617 DOI: 10.1111/avj.12963] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Revised: 05/03/2020] [Accepted: 05/05/2020] [Indexed: 11/29/2022]
Abstract
OBJECTIVE To assess the efficacy of an herbal spray combining various essential oils, with a claim of mast cell stabilisation, antipruritic, anti-inflammatory, and insect repellent effects on the clinical presentation of insect bite hypersensitivity (IBH) in horses. DESIGN Double-blinded, placebo-controlled, randomised, cross-over clinical trial. METHODS Twenty adult horses with clinical IBH were treated with a daily application of herbal spray or placebo for 28 days in a randomised, cross-over fashion, separated by a>28-day washout period. Horses were examined and scored prior to and after the completion of each treatment. Histopathology was performed on four horses. Owners kept daily diaries of observations. RESULTS The herbal spray significantly reduced the severity of all assessed parameters (pruritus, excoriations, lichenification and alopecia; P < 0.05) compared with baseline values (pretreatment) and with placebo. Owners reported improvement of pruritus in 19/20 horses (95%) with complete resolution in 17 horses (85%) following treatment. Skin biopsies showed resolution of orthokeratosis in 4/4 horses, reduced thickness of the stratum spinosum in 2/4 horses and complete resolution of histopathological abnormalities in 1/4 horses after treatment, compared with either no change or deterioration of histopathologic lesions after placebo. No side effects were observed. CONCLUSIONS The tested herbal spray may be an effective treatment for the management of equine IBH.
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Affiliation(s)
- A Cox
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia
| | - K Wood
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia.,School of Integrative Biology, University of Liverpool, Bishoftu, Ethiopia
| | - G Coleman
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia
| | - A J Stewart
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia
| | - F-R Bertin
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia
| | - H Owen
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia.,Vetnostics, QML Pathology, Mansfield, Queensland, Australia
| | - W W Suen
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia.,CSIRO Australian Animal Health Laboratory, Geelong, Victoria, Australia
| | - C E Medina-Torres
- School of Veterinary Science, The University of Queensland, Gatton, Queensland, Australia
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5
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Jonsdottir S, Fettelschoss V, Olomski F, Talker SC, Mirkovitch J, Rhiner T, Birkmann K, Thoms F, Wagner B, Bachmann MF, Kündig TM, Marti E, Fettelschoss-Gabriel A. Safety Profile of a Virus-Like Particle-Based Vaccine Targeting Self-Protein Interleukin-5 in Horses. Vaccines (Basel) 2020; 8:vaccines8020213. [PMID: 32397549 PMCID: PMC7349629 DOI: 10.3390/vaccines8020213] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2020] [Revised: 05/05/2020] [Accepted: 05/05/2020] [Indexed: 12/23/2022] Open
Abstract
Background: Insect bite hypersensitivity (IBH) is an eosinophilic allergic dermatitis of horses caused by type I/IVb reactions against mainly Culicoides bites. The vaccination of IBH-affected horses with equine IL-5 coupled to the Cucumber mosaic virus-like particle (eIL-5-CuMVTT) induces IL-5-specific auto-antibodies, resulting in a significant reduction in eosinophil levels in blood and clinical signs. Objective: the preclinical and clinical safety of the eIL-5-CuMVTT vaccine. Methods: The B cell responses were assessed by longitudinal measurement of IL-5- and CuMVTT-specific IgG in the serum and plasma of vaccinated and unvaccinated horses. Further, peripheral blood mononuclear cells (PBMCs) from the same horses were re-stimulated in vitro for the proliferation and IFN-γ production of specific T cells. In addition, we evaluated longitudinal kidney and liver parameters and the general blood status. An endogenous protein challenge was performed in murine IL-5-vaccinated mice. Results: The vaccine was well tolerated as assessed by serum and cellular biomarkers and also induced reversible and neutralizing antibody titers in horses and mice. Endogenous IL-5 stimulation was unable to re-induce anti-IL-5 production. The CD4+ T cells of vaccinated horses produced significantly more IFN-γ and showed a stronger proliferation following stimulation with CuMVTT as compared to the unvaccinated controls. Re-stimulation using E. coli-derived proteins induced low levels of IFNγ+CD4+ cells in vaccinated horses; however, no IFN-γ and proliferation were induced following the HEK-eIL-5 re-stimulation. Conclusions: Vaccination using eIL-5-CuMVTT induces a strong B-cell as well as CuMVTT-specific T cell response without the induction of IL-5-specific T cell responses. Hence, B-cell unresponsiveness against self-IL-5 can be bypassed by inducing CuMVTT carrier-specific T cells, making the vaccine a safe therapeutic option for IBH-affected horses.
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Affiliation(s)
- Sigridur Jonsdottir
- Clinical Immunology Group, Department for Clinical Research VPH, Vetsuisse Faculty of the University of Bern, Länggassstrasse 124, 3012 Bern, Switzerland; (S.J.); (J.M.); (E.M.)
- Department of Dermatology, University Hospital Zurich, Wagistrasse 12, 8952 Schlieren, Switzerland; (V.F.); (F.O.); (T.R.); (F.T.)
- Faculty of Medicine, University of Zurich, 8091 Zurich, Switzerland
| | - Victoria Fettelschoss
- Department of Dermatology, University Hospital Zurich, Wagistrasse 12, 8952 Schlieren, Switzerland; (V.F.); (F.O.); (T.R.); (F.T.)
- Faculty of Medicine, University of Zurich, 8091 Zurich, Switzerland
- Evax AG, Hörnlistrass 3, 9542 Münchwilen, Switzerland;
| | - Florian Olomski
- Department of Dermatology, University Hospital Zurich, Wagistrasse 12, 8952 Schlieren, Switzerland; (V.F.); (F.O.); (T.R.); (F.T.)
- Faculty of Medicine, University of Zurich, 8091 Zurich, Switzerland
| | - Stephanie C. Talker
- Institute of Virology and Immunology, Länggassstrasse 122, 3012 Bern, Switzerland;
- Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Länggassstrasse 122, 3012 Bern, Switzerland
| | - Jelena Mirkovitch
- Clinical Immunology Group, Department for Clinical Research VPH, Vetsuisse Faculty of the University of Bern, Länggassstrasse 124, 3012 Bern, Switzerland; (S.J.); (J.M.); (E.M.)
| | - Tanya Rhiner
- Department of Dermatology, University Hospital Zurich, Wagistrasse 12, 8952 Schlieren, Switzerland; (V.F.); (F.O.); (T.R.); (F.T.)
- Faculty of Medicine, University of Zurich, 8091 Zurich, Switzerland
| | | | - Franziska Thoms
- Department of Dermatology, University Hospital Zurich, Wagistrasse 12, 8952 Schlieren, Switzerland; (V.F.); (F.O.); (T.R.); (F.T.)
- Faculty of Medicine, University of Zurich, 8091 Zurich, Switzerland
| | - Bettina Wagner
- Departments of Population Medicine and Diagnostic Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853-0001, USA;
| | - Martin F. Bachmann
- RIA Immunology, Inselspital, University of Bern, 3012 Bern, Switzerland;
- Jenner Institute, Nuffield Department of Medicine, Henry Welcome Building for Molecular Physiology, University of Oxford, OX1 2JD Oxford, UK
| | - Thomas M. Kündig
- Department of Dermatology, University Hospital Zurich, Gloriastrasse 31, 8091 Zurich, Switzerland;
| | - Eliane Marti
- Clinical Immunology Group, Department for Clinical Research VPH, Vetsuisse Faculty of the University of Bern, Länggassstrasse 124, 3012 Bern, Switzerland; (S.J.); (J.M.); (E.M.)
| | - Antonia Fettelschoss-Gabriel
- Department of Dermatology, University Hospital Zurich, Wagistrasse 12, 8952 Schlieren, Switzerland; (V.F.); (F.O.); (T.R.); (F.T.)
- Faculty of Medicine, University of Zurich, 8091 Zurich, Switzerland
- Evax AG, Hörnlistrass 3, 9542 Münchwilen, Switzerland;
- Correspondence:
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6
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Brosnahan MM. Eosinophils of the horse: Part II: Eosinophils in clinical diseases. EQUINE VET EDUC 2020. [DOI: 10.1111/eve.13262] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- M. M. Brosnahan
- College of Veterinary Medicine Midwestern University Glendale Arizona USA
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7
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Jonsdottir S, Cvitas I, Svansson V, Fettelschloss-Gabriel A, Torsteinsdottir S, Marti E. New Strategies for Prevention and Treatment of Insect Bite Hypersensitivity in Horses. CURRENT DERMATOLOGY REPORTS 2019. [DOI: 10.1007/s13671-019-00279-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Abstract
Purpose of Review
Treatment of equine insect bite hypersensitivity (IBH) needs to be improved. Allergen-specific immunotherapy (ASIT), the only curative treatment of allergy, currently has only a limited efficacy for treatment of IBH. This review highlights the latest findings in prophylactic and therapeutic strategies.
Recent Findings
Prophylactic vaccination against IBH using recombinant Culicoides allergen has been developed in unexposed Icelandic horses and is ready to be tested. Therapeutic virus-like particle (VLP)–based vaccines targeting equine interleukin- (IL-) 5 or IL-31 improved clinical signs of IBH by induction of anti-cytokine antibodies thus reducing eosinophil counts or allergic pruritus, respectively.
Summary
First studies for development of ASIT using pure r-Culicoides allergens have yielded promising results and need now to be tested in clinical studies for both prevention and treatment of IBH. Therapeutic vaccines inducing neutralizing antibodies against IL-5 or IL-31 will be valuable future treatments for reduction of clinical signs of IBH.
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Wilkołek P, Szczepanik M, Sitkowski W, Adamek Ł, Pluta M, Taszkun I, Gołyński M. A Comparison of Intradermal Skin Testing and Serum Insect Allergen-specific IgE Determination in Horses With Insect Bite Hypersensitivity From 2008 to 2016. J Equine Vet Sci 2019; 75:65-68. [DOI: 10.1016/j.jevs.2019.01.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 12/19/2018] [Accepted: 01/02/2019] [Indexed: 11/26/2022]
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9
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Nisbet AJ, Burgess TG. Ectoparasite immunology. Parasite Immunol 2014; 36:551-2. [PMID: 25520973 DOI: 10.1111/pim.12154] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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