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Sanchez MV, Ebensen T, Schulze K, Cargnelutti DE, Scodeller EA, Guzmán CA. Protective Efficacy of a Mucosal Influenza Vaccine Formulation Based on the Recombinant Nucleoprotein Co-Administered with a TLR2/6 Agonist BPPcysMPEG. Pharmaceutics 2023; 15:pharmaceutics15030912. [PMID: 36986773 PMCID: PMC10057018 DOI: 10.3390/pharmaceutics15030912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Revised: 02/24/2023] [Accepted: 03/03/2023] [Indexed: 03/16/2023] Open
Abstract
Current influenza vaccines target highly variable surface glycoproteins; thus, mismatches between vaccine strains and circulating strains often diminish vaccine protection. For this reason, there is still a critical need to develop effective influenza vaccines able to protect also against the drift and shift of different variants of influenza viruses. It has been demonstrated that influenza nucleoprotein (NP) is a strong candidate for a universal vaccine, which contributes to providing cross-protection in animal models. In this study, we developed an adjuvanted mucosal vaccine using the recombinant NP (rNP) and the TLR2/6 agonist S-[2,3-bispalmitoyiloxy-(2R)-propyl]-R-cysteinyl-amido-monomethoxyl-poly-ethylene-glycol (BPPcysMPEG). The vaccine efficacy was compared with that observed following parenteral vaccination of mice with the same formulation. Mice vaccinated with 2 doses of rNP alone or co-administered with BPPcysMPEG by the intranasal (i.n.) route showed enhanced antigen-specific humoral and cellular responses. Moreover, NP-specific humoral immune responses, characterized by significant NP-specific IgG and IgG subclass titers in sera and NP-specific IgA titers in mucosal territories, were remarkably increased in mice vaccinated with the adjuvanted formulation as compared with those of the non-adjuvanted vaccination group. The addition of BPPcysMPEG also improved NP-specific cellular responses in vaccinated mice, characterized by robust lymphoproliferation and mixed Th1/Th2/Th17 immune profiles. Finally, it is notable that the immune responses elicited by the novel formulation administered by the i.n. route were able to confer protection against the influenza H1N1 A/Puerto Rico/8/1934 virus.
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Affiliation(s)
- Maria Victoria Sanchez
- Laboratorio de Inmunología y Desarrollo de Vacunas, Instituto de Medicina y Biología Experimental de Cuyo (IMBECU), CCT-CONICET, Universidad Nacional de Cuyo, Mendoza M5500, Argentina; (M.V.S.); (D.E.C.); (E.A.S.)
- Department of Vaccinology and Applied Microbiology, Helmholtz Centre for Infection Research, 38124 Braunschweig, Germany; (T.E.); (K.S.)
| | - Thomas Ebensen
- Department of Vaccinology and Applied Microbiology, Helmholtz Centre for Infection Research, 38124 Braunschweig, Germany; (T.E.); (K.S.)
| | - Kai Schulze
- Department of Vaccinology and Applied Microbiology, Helmholtz Centre for Infection Research, 38124 Braunschweig, Germany; (T.E.); (K.S.)
| | - Diego Esteban Cargnelutti
- Laboratorio de Inmunología y Desarrollo de Vacunas, Instituto de Medicina y Biología Experimental de Cuyo (IMBECU), CCT-CONICET, Universidad Nacional de Cuyo, Mendoza M5500, Argentina; (M.V.S.); (D.E.C.); (E.A.S.)
| | - Eduardo A. Scodeller
- Laboratorio de Inmunología y Desarrollo de Vacunas, Instituto de Medicina y Biología Experimental de Cuyo (IMBECU), CCT-CONICET, Universidad Nacional de Cuyo, Mendoza M5500, Argentina; (M.V.S.); (D.E.C.); (E.A.S.)
| | - Carlos A. Guzmán
- Department of Vaccinology and Applied Microbiology, Helmholtz Centre for Infection Research, 38124 Braunschweig, Germany; (T.E.); (K.S.)
- Correspondence: ; Tel.: +49-531-61814600; Fax: +49-531-618414699
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Sadeghi M, Keshavarz Shahbaz S, Dehnavi S, Koushki K, Sankian M. Current possibilities and future perspectives for improving efficacy of allergen-specific sublingual immunotherapy. Int Immunopharmacol 2021; 101:108350. [PMID: 34782275 DOI: 10.1016/j.intimp.2021.108350] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 11/02/2021] [Accepted: 11/04/2021] [Indexed: 10/19/2022]
Abstract
Allergen-specific sublingual immunotherapy (SLIT), a safe and efficient route for treating type I hypersensitivity disorders, requires high doses of allergens. SLIT is generally performed without adjuvants and delivery systems. Therefore, allergen formulation with appropriate presentation platforms results in improved allergen availability, targeting the immune cells, inducing regulatory immune responses, and enhancing immunotherapy's efficacy while decreasing the dose of the allergen. In this review, we discuss the adjuvants and delivery systems that have been applied as allergen-presentation platforms for SLIT. These adjuvants include TLRs ligands, 1α, 25-dihydroxy vitamin D3, galectin-9, probiotic and bacterial components that provoke allergen-specific helper type-1 T lymphocytes (TH1), and regulatory T cells (Tregs). Another approach is encapsulation or adsorption of the allergens into a particulate vector system to facilitate allergen capture by tolerogenic dendritic cells. Also, we proposed strategies to increasing the efficacy of SLIT via new immunopotentiators and carrier systems in the future.
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Affiliation(s)
- Mahvash Sadeghi
- Department of Immunology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
| | - Sanaz Keshavarz Shahbaz
- Cellular and Molecular Research Center, Research Institute for Prevention of Non-communicable Disease, Qazvin University of Medical Sciences, Qazvin, Iran
| | - Sajad Dehnavi
- Department of Immunology, School of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Khadijeh Koushki
- Hepatitis Research Center, Lorestan University of Medical Sciences, Khorramabad, Iran
| | - Mojtaba Sankian
- Immunobiochemistry Lab, Immunology Research Center, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran.
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Kirtland ME, Tsitoura DC, Durham SR, Shamji MH. Toll-Like Receptor Agonists as Adjuvants for Allergen Immunotherapy. Front Immunol 2020; 11:599083. [PMID: 33281825 PMCID: PMC7688745 DOI: 10.3389/fimmu.2020.599083] [Citation(s) in RCA: 62] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2020] [Accepted: 10/19/2020] [Indexed: 01/19/2023] Open
Abstract
Toll-like receptors (TLRs) are essential components of innate immunity and provide defensive inflammatory responses to invading pathogens. Located within the plasma membranes of cells and also intracellular endosomes, TLRs can detect a range of pathogen associated molecular patterns from bacteria, viruses and fungi. TLR activation on dendritic cells can propagate to an adaptive immune response, making them attractive targets for the development of both prophylactic and therapeutic vaccines. In contrast to conventional adjuvants such as aluminium salts, TLR agonists have a clear immunomodulatory profile that favours anti-allergic T lymphocyte responses. Consequently, the potential use of TLRs as adjuvants in Allergen Immunotherapy (AIT) for allergic rhinitis and asthma remains of great interest. Allergic Rhinitis is a Th2-driven, IgE-mediated disease that occurs in atopic individuals in response to exposure to otherwise harmless aeroallergens such as pollens, house dust mite and animal dander. AIT is indicated in subjects with allergic rhinitis whose symptoms are inadequately controlled by antihistamines and nasal corticosteroids. Unlike anti-allergic drugs, AIT is disease-modifying and may induce long-term disease remission through mechanisms involving upregulation of IgG and IgG4 antibodies, induction of regulatory T and B cells, and immune deviation in favour of Th1 responses that are maintained after treatment discontinuation. This process takes up to three years however, highlighting an unmet need for a more efficacious therapy with faster onset. Agonists targeting different TLRs to treat allergy are at different stages of development. Synthetic TLR4, and TLR9 agonists have progressed to clinical trials, while TLR2, TLR5 and TLR7 agonists been shown to have potent anti-allergic effects in human in vitro experiments and in vivo in animal studies. The anti-allergic properties of TLRs are broadly characterised by a combination of enhanced Th1 deviation, regulatory responses, and induction of blocking antibodies. While promising, a durable effect in larger clinical trials is yet to be observed and further long-term studies and comparative trials with conventional AIT are required before TLR adjuvants can be considered for inclusion in AIT. Here we critically evaluate experimental and clinical studies investigating TLRs and discuss their potential role in the future of AIT.
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Affiliation(s)
- Max E Kirtland
- Immunomodulation and Tolerance Group, Allergy and Clinical Immunology, Inflammation, Repair and Development, National Heart and Lung Institute, Imperial College London, London, United Kingdom.,NIHR Biomedical Research Centre, Asthma UK Centre in Allergic Mechanisms of Asthma Imperial College London, London, United Kingdom
| | - Daphne C Tsitoura
- Inflammation, Repair and Development, National Heart and Lung Institute, Imperial College London, London, United Kingdom
| | - Stephen R Durham
- Immunomodulation and Tolerance Group, Allergy and Clinical Immunology, Inflammation, Repair and Development, National Heart and Lung Institute, Imperial College London, London, United Kingdom.,NIHR Biomedical Research Centre, Asthma UK Centre in Allergic Mechanisms of Asthma Imperial College London, London, United Kingdom
| | - Mohamed H Shamji
- Immunomodulation and Tolerance Group, Allergy and Clinical Immunology, Inflammation, Repair and Development, National Heart and Lung Institute, Imperial College London, London, United Kingdom.,NIHR Biomedical Research Centre, Asthma UK Centre in Allergic Mechanisms of Asthma Imperial College London, London, United Kingdom
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Volckmar J, Gereke M, Ebensen T, Riese P, Philipsen L, Lienenklaus S, Wohlleber D, Klopfleisch R, Stegemann-Koniszewski S, Müller AJ, Gruber AD, Knolle P, Guzman CA, Bruder D. Targeted antigen delivery to dendritic cells elicits robust antiviral T cell-mediated immunity in the liver. Sci Rep 2017; 7:43985. [PMID: 28266658 PMCID: PMC5339819 DOI: 10.1038/srep43985] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Accepted: 02/02/2017] [Indexed: 01/13/2023] Open
Abstract
Hepatotropic viruses such as hepatitis C virus cause life-threatening chronic liver infections in millions of people worldwide. Targeted in vivo antigen-delivery to cross-presenting dendritic cells (DCs) has proven to be extraordinarily efficient in stimulating antigen-specific T cell responses. To determine whether this approach would as well be suitable to induce local antiviral effector T cells in the liver we compared different vaccine formulations based on either the targeting of DEC-205 or TLR2/6 on cross-presenting DCs or formulations not involving in vivo DC targeting. As read-outs we used in vivo hepatotropic adenovirus challenge, histology and automated multidimensional fluorescence microscopy (MELC). We show that targeted in vivo antigen delivery to cross-presenting DCs is highly effective in inducing antiviral CTLs capable of eliminating virus-infected hepatocytes, while control vaccine formulation not involving DC targeting failed to induce immunity against hepatotropic virus. Moreover, we observed distinct patterns of CD8+ T cell interaction with virus-infected and apoptotic hepatocytes in the two DC-targeting groups suggesting that the different vaccine formulations may stimulate distinct types of effector functions. Our findings represent an important step toward the future development of vaccines against hepatotropic viruses and the treatment of patients with hepatic virus infection after liver transplantation to avoid reinfection.
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Affiliation(s)
- Julia Volckmar
- Immune Regulation Group, Helmholtz Centre for Infection Research, Braunschweig, Germany &Infection Immunology Group, Institute of Medical Microbiology, Infection Control and Prevention, Medical Faculty of the Otto-von-Guericke University Magdeburg, Magdeburg, Germany
| | - Marcus Gereke
- Immune Regulation Group, Helmholtz Centre for Infection Research, Braunschweig, Germany &Infection Immunology Group, Institute of Medical Microbiology, Infection Control and Prevention, Medical Faculty of the Otto-von-Guericke University Magdeburg, Magdeburg, Germany
| | - Thomas Ebensen
- Department of Vaccinology and Applied Microbiology, Helmholtz Centre for Infection Research, Braunschweig, Germany
| | - Peggy Riese
- Department of Vaccinology and Applied Microbiology, Helmholtz Centre for Infection Research, Braunschweig, Germany
| | - Lars Philipsen
- Intravital Microscopy in Infection and Immunity, Institute for Molecular and Clinical Immunology, Medical Faculty of the Otto-von-Guericke University Magdeburg, Magdeburg, Germany
| | - Stefan Lienenklaus
- Department of Molecular Immunology, Helmholtz Centre for Infection Research, Braunschweig, Germany
| | - Dirk Wohlleber
- Institute of Molecular Immunology, Technische Universität München, Germany
| | - Robert Klopfleisch
- Department of Veterinary Medicine, Institute of Veterinary Pathology, Free University Berlin, Berlin, Germany
| | - Sabine Stegemann-Koniszewski
- Immune Regulation Group, Helmholtz Centre for Infection Research, Braunschweig, Germany &Infection Immunology Group, Institute of Medical Microbiology, Infection Control and Prevention, Medical Faculty of the Otto-von-Guericke University Magdeburg, Magdeburg, Germany
| | - Andreas J Müller
- Intravital Microscopy in Infection and Immunity, Institute for Molecular and Clinical Immunology, Medical Faculty of the Otto-von-Guericke University Magdeburg, Magdeburg, Germany
| | - Achim D Gruber
- Department of Veterinary Medicine, Institute of Veterinary Pathology, Free University Berlin, Berlin, Germany
| | - Percy Knolle
- Institute of Molecular Immunology, Technische Universität München, Germany.,Institute of Molecular Medicine and Experimental Immunology, Universität Bonn, Germany
| | - Carlos A Guzman
- Department of Vaccinology and Applied Microbiology, Helmholtz Centre for Infection Research, Braunschweig, Germany
| | - Dunja Bruder
- Immune Regulation Group, Helmholtz Centre for Infection Research, Braunschweig, Germany &Infection Immunology Group, Institute of Medical Microbiology, Infection Control and Prevention, Medical Faculty of the Otto-von-Guericke University Magdeburg, Magdeburg, Germany
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Klimek L, Mullol J, Hellings P, Gevaert P, Mösges R, Fokkens W. Recent pharmacological developments in the treatment of perennial and persistent allergic rhinitis. Expert Opin Pharmacother 2016; 17:657-69. [PMID: 26800187 DOI: 10.1517/14656566.2016.1145661] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
INTRODUCTION Allergic rhinitis (AR) has a major negative impact on patients' quality of life (QoL) and carries a high socio economic burden. This is particularly the case for patients who experience symptoms for extended periods of time (i.e. those with perennial (PAR) or persistent AR (PER), depending on the classification system used). This review covers available pharmacological advances and recent developments in the treatment of PAR or PER. AREAS COVERED Pharmacological AR treatment is used to reduce symptom burden and help restore patients' normal daily routine. Traditionally, non-sedating antihistamines and intranasal corticosteroids (INS) were the two drug classes recommended for use first line. These, along with antileukotrienes, decongestants, mast cell stabilizers and anticholinergics, constituted the bulk of the AR treatment arsenal. MP-AzeFlu (Dymista®, Meda, Solna, Sweden) is the most recent addition to that arsenal. It is a novel intranasal formulation of azelastine hydrochloride (AZE) and fluticasone propionate (FP) delivered in a single spray and has surpassed available therapies in terms of symptom control and treatment response. Other relatively new treatments for PAR or PER include H3 antihistamines, toll-like receptor (TLR) agonists, cellulose powders and micro-emulsions, novel biomolecular formulations and omalizumab. Each of these new additions is reviewed here. EXPERT OPINION A new AR drug class has recently been introduced (i.e. RO1AD58). Currently MP-AzeFlu is the only treatment option within this drug class. It can be estimated that combination treatments like MP-AzeFlu will become the mainstay of PAR and PER therapy since use will result in better compliance, improved efficacy over INS and a faster response together with good levels of tolerability. The challenge is to find other equally, or more effective, combination treatments, as has been the therapeutic standard in bronchial asthma for decades. The potential of biologics, as well as TLR-agonists and other new treatment options needs to be further evaluated.
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Affiliation(s)
- Ludger Klimek
- a Center for Rhinology and Allergology , Wiesbaden , Germany
| | - Joaquim Mullol
- b Clinical and Experimental Respiratory Immunoallergy, IDIBAPS; Rhinology and Smell Clinic, ENT Department , Hospital Clínic , Barcelona , Spain
| | - Peter Hellings
- c Laboratory of Clinical Immunology , University Hospitals Leuven , Leuven , Belgium
| | - Philippe Gevaert
- d Upper Airways Research Laboratory, Department of Otorhinolaryngology , Ghent University Hospital , Ghent , Belgium
| | - Ralph Mösges
- e Institute of Medical Statistics , Informatics and Epidemiology (IMSIE) , Cologne , Germany
| | - Wytske Fokkens
- f Department of Otorhinolaryngology , Academic Medical Center, University of Amsterdam , Amsterdam , the Netherlands
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Kawahara T, Nakayama D, Tanaka K, Yasui H. Effect of Oral Administration of the IgE-suppressive Wild Yeast Strain <i>Saccharomyces paradoxus</i> P01 on the Development of Atopic Dermatitis-like Symptoms in NC/Nga Mice. FOOD SCIENCE AND TECHNOLOGY RESEARCH 2015. [DOI: 10.3136/fstr.21.223] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Affiliation(s)
- Takeshi Kawahara
- Graduate School of Agriculture, Shinshu University
- Department of Interdisciplinary Genome Sciences and Cell Metabolism, Institute for Biomedical Sciences, Interdisciplinary Cluster for Cutting Edge Research (IBS-ICCER) Shinshu University
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Pandey SP, Chandel HS, Srivastava S, Selvaraj S, Jha MK, Shukla D, Ebensen T, Guzman CA, Saha B. Pegylated bisacycloxypropylcysteine, a diacylated lipopeptide ligand of TLR6, plays a host-protective role against experimental Leishmania major infection. THE JOURNAL OF IMMUNOLOGY 2014; 193:3632-43. [PMID: 25194056 DOI: 10.4049/jimmunol.1400672] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
TLRs recognize pathogen-expressed Ags and elicit host-protective immune response. Although TLR2 forms heterodimers with TLR1 or TLR6, recognizing different ligands, differences in the functions of these heterodimers remain unknown. In this study, we report that in Leishmania major-infected macrophages, the expression of TLR1 and TLR2, but not TLR6, increased; TLR2-TLR2 association increased, but TLR2-TLR6 association diminished. Lentivirus-expressed TLR1-short hairpin RNA (shRNA) or TLR2-shRNA administration reduced, but TLR6-shRNA increased L. major infection in BALB/c mice. Corroboratively, Pam3CSK4 (TLR1-TLR2 ligand) and peptidoglycan (TLR2 ligand) increased L. major infection but reduced TLR9 expression, whereas pegylated bisacycloxypropylcysteine (BPPcysMPEG; TLR2-TLR6 ligand) reduced L. major number in L. major-infected macrophages, accompanied by increased TLR9 expression, higher IL-12 production, and inducible NO synthase expression. Whereas MyD88, Toll/IL-1R adaptor protein, and TNFR-α-associated factor 6 recruitments to TLR2 were not different in Pam3CSK4-, peptidoglycan-, or BPPcysMPEG-treated macrophages, only BPPcysMPEG enhanced p38MAPK and activating transcription factor 2 activation. BPPcysMPEG conferred antileishmanial functions to L. major-infected BALB/c-derived T cells in a macrophage-T cell coculture and in BALB/c mice; the protection was TLR6 dependent and IL-12 dependent, and it was accompanied by reduced regulatory T cell number. BPPcysMPEG administration during the priming with fixed L. major protected BALB/c mice against challenge L. major infection; the protection was accompanied by low IL-4 and IL-10, but high IFN-γ productions and reduced regulatory T cells. Thus, BPPcysMPEG, a novel diacylated lipopeptide ligand for TLR2-TLR6 heterodimer, induces IL-12-dependent, inducible NO synthase-dependent, T-reg-sensitive antileishmanial protection. The data reveal a novel dimerization partner-dependent duality in TLR2 function.
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Affiliation(s)
| | | | - Sunit Srivastava
- National Centre for Cell Science, Ganeshkhind, Pune 411007, India; and
| | | | - Mukesh Kumar Jha
- National Centre for Cell Science, Ganeshkhind, Pune 411007, India; and
| | - Divanshu Shukla
- National Centre for Cell Science, Ganeshkhind, Pune 411007, India; and
| | - Thomas Ebensen
- Department of Vaccinology and Applied Microbiology, Helmholtz Centre for Infection Research, Braunschweig, 38124 Braunschweig, Germany
| | - Carlos A Guzman
- Department of Vaccinology and Applied Microbiology, Helmholtz Centre for Infection Research, Braunschweig, 38124 Braunschweig, Germany
| | - Bhaskar Saha
- National Centre for Cell Science, Ganeshkhind, Pune 411007, India; and
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Aryan Z, Holgate ST, Radzioch D, Rezaei N. A new era of targeting the ancient gatekeepers of the immune system: toll-like agonists in the treatment of allergic rhinitis and asthma. Int Arch Allergy Immunol 2014; 164:46-63. [PMID: 24853609 DOI: 10.1159/000362553] [Citation(s) in RCA: 78] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Toll-like receptors (TLR) belong to a large family of pattern recognition receptors known as the ancient 'gatekeepers' of the immune system. TLRs are located at the first line of defense against invading pathogens as well as aeroallergens, making them interesting targets to modulate the natural history of respiratory allergy. Agonists of TLRs have been widely employed in therapeutic or prophylactic preparations useful for asthma/allergic rhinitis (AR) patients. MPL® (a TLR4 agonist) and the CpG oligodeoxynucleotide of 1018 ISS, a TLR9 agonist, show strong immunogenicity effects that make them appropriate adjuvants for allergy vaccines. Targeting the TLRs can enhance the efficacy of specific allergen immunotherapy, currently the only available 'curative' treatment for respiratory allergies. In addition, intranasal administration of AZD8848 (a TLR7 agonist) and VTX-1463 (a TLR8 agonist) as stand-alone therapeutics have revealed efficacy in the relief of the symptoms of AR patients. No anaphylaxis has been so far reported with such compounds targeting TLRs, with the most common adverse effects being transient and local irritation (e.g. redness, swelling and pruritus). Many other compounds that target TLRs have been found to suppress airway inflammation, eosinophilia and airway hyper-responsiveness in various animal models of allergic inflammation. Indeed, in the future a wide variability of TLR agonists and even antagonists that exhibit anti-asthma/AR effects are likely to emerge.
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Affiliation(s)
- Zahra Aryan
- Molecular Immunology Research Center and Department of Immunology, School of Medicine, Tehran, Iran
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Krishnaswamy JK, Jirmo AC, Baru AM, Ebensen T, Guzmán CA, Sparwasser T, Behrens GMN. Toll-like receptor-2 agonist-allergen coupling efficiently redirects Th2 cell responses and inhibits allergic airway eosinophilia. Am J Respir Cell Mol Biol 2012; 47:852-63. [PMID: 22962064 DOI: 10.1165/rcmb.2011-0414oc] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Toll-like receptor (TLR) agonists beneficially modulate allergic airway inflammation. However, the efficiency of TLR agonists varies considerably, and their exact cellular mechanisms (especially of TLR 2/6 agonists) are incompletely understood. We investigated at a cellular level whether the administration of the pharmacologically improved TLR2/6 agonist S-[2,3-bispalmitoyiloxy-(2R)-propyl]-R-cysteinyl-amido-monomethoxy polyethylene glycol (BPP) conjugated to antigenic peptide (BPP-OVA) could divert an existing Th2 response and influence airway eosinophilia. The effects of BPP-OVA on airway inflammation were assessed in a classic murine sensitization/challenge model and an adoptive transfer model, which involved the adoptive transfer of in vitro differentiated ovalbumin (OVA)-specific Th2 cells. Functional T-cell stimulation by lung dendritic cells (DCs) was determined both in vitro and in vivo, combined with a cytokine secretion analysis. A single mucosal application of BPP-OVA efficiently delivered antigen, led to TLR2-mediated DC activation, and resulted in OVA-specific T-cell proliferation via lung DCs in vivo. In alternative models of allergic airway disease, a single administration of BPP-OVA before OVA challenge (but not BPP alone) significantly reduced airway eosinophilia, most likely through altered antigen-specific T-cell stimulation via DCs. Analyses of adoptively transferred Th2-biased cells after BPP-OVA administration in vivo suggested that BPP-OVA guides antigen-specific Th2 cells to produce significantly higher amounts of IFN-γ upon allergen challenge. In conclusion, our data show for the first time that a single mucosal administration of a TLR 2/6 agonist-allergen conjugate can provoke IFN-γ responses in Th2-biased cells and alleviate allergic airway inflammation.
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