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Pereira MC, Nodari EF, de Abreu MR, Paiatto LN, Simioni PU, Camargo-Mathias MI. Rhipicephalus sanguineus salivary gland extract as a source of immunomodulatory molecules. EXPERIMENTAL & APPLIED ACAROLOGY 2021; 83:387-398. [PMID: 33590358 DOI: 10.1007/s10493-021-00591-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Accepted: 01/22/2021] [Indexed: 06/12/2023]
Abstract
Rhipicephalus sanguineus sensu lato (s.l.), popularly known as 'brown dog tick', is the primary vector of pathogens affecting dogs worldwide. To enter the host's organism, these pathogens utilise the anticoagulant, antiplatelet, anti-inflammatory and immunomodulatory actions of compounds present in the tick's saliva; such compounds are released by the ectoparasite in order to attach and feed on dogs. Nitric oxide (NO) is one of the regulatory factors in inflammation, apoptosis and immunomodulation. Here, we evaluated the in vitro activity of salivary gland extract of female dog ticks on the macrophage-derived J774 cell line, with and without lipopolysaccharide (LPS) stimulation. Cultures were evaluated for possible morphological alterations caused by exposure to the extract. There was no apparent in vitro cytotoxicity of the extract. Also, the NO secretory response in the non-LPS-stimulated cells was not inhibited. On the other hand, the extract presented modulatory action in the cultures of LPS-stimulated cells at a concentration of 0.1 μg/mL, possibly through macrophage activation, and induced a significant decrease in NO secretion. These results confirm the modulatory potential of bioactive molecules in the salivary glands of R. sanguineus ticks.
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Affiliation(s)
- Melissa Carolina Pereira
- Department of Biology, Institute of Biosciences, São Paulo State University - UNESP, Rio Claro, SP, 13506-900, Brazil
| | - Elen Fernanda Nodari
- Department of Biology, Institute of Biosciences, São Paulo State University - UNESP, Rio Claro, SP, 13506-900, Brazil
| | - Marina Rodrigues de Abreu
- Department of Biology, Institute of Biosciences, São Paulo State University - UNESP, Rio Claro, SP, 13506-900, Brazil
| | - Lisiery Negrini Paiatto
- Department of Genetics, Evolution and Bioagents, Institute of Biology, University of Campinas - UNICAMP, Campinas, SP, 13083-970, Brazil
| | - Patrícia Ucelli Simioni
- Department of Genetics, Evolution and Bioagents, Institute of Biology, University of Campinas - UNICAMP, Campinas, SP, 13083-970, Brazil
| | - Maria Izabel Camargo-Mathias
- Department of Biology, Institute of Biosciences, São Paulo State University - UNESP, Rio Claro, SP, 13506-900, Brazil.
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2
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Cabanelas E, Panadero R, Baumman A, Alves MP, Summerfield A, García-Dios D, Díaz P, Remesar S, Fernández G, Morrondo MP, Díez-Baños P, López CM. Cytokine expression in bovine PBMC cultures stimulated with Hypoderma lineatum antigens. Vet Parasitol 2020; 283:109165. [PMID: 32535488 DOI: 10.1016/j.vetpar.2020.109165] [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: 01/03/2020] [Revised: 06/04/2020] [Accepted: 06/06/2020] [Indexed: 10/24/2022]
Abstract
Hypoderma antigens are involved in host inflammation and immune response, conditioning larvae survival. In this study, peripheral blood mononuclear cell (PBMC) cultures from Hypoderma sensitized and unsensitized cattle were performed to determine the effect of H. lineatum antigens and incubation time (18, 24, 48 h) on IFN-γ, TNF-α, IL-10 and IL-4 mRNA gene expression determined by RT-qPCR. TNF-α and IL-4 gene expression were higher in Hypoderma previously sensitized PBMCs, suggesting that a mixed Th1/Th2 response may play a significant role in host defence reactions against Hypoderma exhibited by previously infested cattle. Incubation time had a significant effect on IL-10 and TNF-α gene expression, which decreased over time. Regarding to H. lineatum antigens, the crude larval extract and the purified fraction hypodermin B (HB) produced a significant reduction of the mRNA expression levels of the proinflammatory cytokine, IFN-γ; moreover, the HB had a stimulating effect on the mRNA gene expression of the anti-inflammatory cytokine IL-10, demonstrating that the parasite would modulate the host defence mechanisms by avoiding harmful immune responses that would limit its survival into the host tissues.
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Affiliation(s)
- E Cabanelas
- Departamento de Patoloxía Animal: Sanidade Animal (Grupo INVESAGA). Facultade de Veterinaria. Universidade de Santiago de Compostela, Lugo, 27002, Spain
| | - R Panadero
- Departamento de Patoloxía Animal: Sanidade Animal (Grupo INVESAGA). Facultade de Veterinaria. Universidade de Santiago de Compostela, Lugo, 27002, Spain.
| | - A Baumman
- Institute of Virology and Immunology, Bern, Switzerland; Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - M P Alves
- Institute of Virology and Immunology, Bern, Switzerland; Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - A Summerfield
- Institute of Virology and Immunology, Bern, Switzerland; Department of Infectious Diseases and Pathobiology, Vetsuisse Faculty, University of Bern, Bern, Switzerland
| | - D García-Dios
- Departamento de Patoloxía Animal: Sanidade Animal (Grupo INVESAGA). Facultade de Veterinaria. Universidade de Santiago de Compostela, Lugo, 27002, Spain
| | - P Díaz
- Departamento de Patoloxía Animal: Sanidade Animal (Grupo INVESAGA). Facultade de Veterinaria. Universidade de Santiago de Compostela, Lugo, 27002, Spain
| | - S Remesar
- Departamento de Patoloxía Animal: Sanidade Animal (Grupo INVESAGA). Facultade de Veterinaria. Universidade de Santiago de Compostela, Lugo, 27002, Spain
| | - G Fernández
- Departamento de Patoloxía Animal: Sanidade Animal (Grupo INVESAGA). Facultade de Veterinaria. Universidade de Santiago de Compostela, Lugo, 27002, Spain
| | - M P Morrondo
- Departamento de Patoloxía Animal: Sanidade Animal (Grupo INVESAGA). Facultade de Veterinaria. Universidade de Santiago de Compostela, Lugo, 27002, Spain
| | - P Díez-Baños
- Departamento de Patoloxía Animal: Sanidade Animal (Grupo INVESAGA). Facultade de Veterinaria. Universidade de Santiago de Compostela, Lugo, 27002, Spain
| | - C M López
- Departamento de Patoloxía Animal: Sanidade Animal (Grupo INVESAGA). Facultade de Veterinaria. Universidade de Santiago de Compostela, Lugo, 27002, Spain
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3
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Blisnick AA, Šimo L, Grillon C, Fasani F, Brûlé S, Le Bonniec B, Prina E, Marsot M, Relmy A, Blaise-Boisseau S, Richardson J, Bonnet SI. The Immunomodulatory Effect of IrSPI, a Tick Salivary Gland Serine Protease Inhibitor Involved in Ixodes ricinus Tick Feeding. Vaccines (Basel) 2019; 7:vaccines7040148. [PMID: 31614804 PMCID: PMC6963187 DOI: 10.3390/vaccines7040148] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2019] [Revised: 10/02/2019] [Accepted: 10/04/2019] [Indexed: 12/31/2022] Open
Abstract
Ticks are the most important vectors of pathogens affecting both domestic and wild animals worldwide. Hard tick feeding is a slow process—taking up to several days—and necessitates extended control over the host response. The success of the feeding process depends upon injection of tick saliva, which not only controls host hemostasis and wound healing, but also subverts the host immune response to avoid tick rejection that creates a favorable niche for the survival and propagation of diverse tick-borne pathogens. Here, we report on the molecular and biochemical features and functions of an Ixodes ricinus serine protease inhibitor (IrSPI). We characterize IrSPI as a Kunitz elastase inhibitor that is overexpressed in several tick organs—especially salivary glands—during blood-feeding. We also demonstrated that when IrSPI is injected into the host through saliva, it had no impact on tissue factor pathway-induced coagulation, fibrinolysis, endothelial cell angiogenesis or apoptosis, but the protein exhibits immunomodulatory activity. In particular, IrSPI represses proliferation of CD4+ T lymphocytes and proinflammatory cytokine secretion from both splenocytes and macrophages. Our study contributes valuable knowledge to tick-host interactions and provides insights that could be further exploited to design anti-tick vaccines targeting this immunomodulator implicated in I. ricinus feeding.
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Affiliation(s)
- Adrien A Blisnick
- UMR BIPAR, Animal Health Laboratory, INRA, ANSES, Ecole Nationale Vétérinaire d'Alfort, Université Paris-Est, 94701 Maisons-Alfort CEDEX, France.
| | - Ladislav Šimo
- UMR BIPAR, Animal Health Laboratory, INRA, ANSES, Ecole Nationale Vétérinaire d'Alfort, Université Paris-Est, 94701 Maisons-Alfort CEDEX, France.
| | - Catherine Grillon
- Centre de Biophysique Moléculaire-UPR 4301 CNRS, 45000 Orléans, France.
| | - Fabienne Fasani
- Centre de Biophysique Moléculaire-UPR 4301 CNRS, 45000 Orléans, France.
| | - Sébastien Brûlé
- Plateforme de Biophysique moléculaire, Institut Pasteur, UMR 3528 CNRS, 75015 Paris, France.
| | - Bernard Le Bonniec
- INSERM UMR-S1140, Faculté de Pharmacie Université Paris Descartes, Sorbonne Paris Cité, 75270 Paris CEDEX 06, France.
| | - Eric Prina
- Unité de Parasitologie moléculaire et Signalisation-INSERM U1201, Institut Pasteur, 75015 Paris, France.
| | - Maud Marsot
- Unité EPI, Animal Health Laboratory, INRA, ANSES, Ecole Nationale Vétérinaire d'Alfort, Université Paris-Est, 94701 Maisons-Alfort CEDEX, France.
| | - Anthony Relmy
- UMR Virologie 1161, Animal Health Laboratory, INRA, ANSES, Ecole Nationale Vétérinaire d'Alfort, Université Paris-Est, 94701 Maisons-Alfort CEDEX, France.
| | - Sandra Blaise-Boisseau
- UMR Virologie 1161, Animal Health Laboratory, INRA, ANSES, Ecole Nationale Vétérinaire d'Alfort, Université Paris-Est, 94701 Maisons-Alfort CEDEX, France.
| | - Jennifer Richardson
- UMR Virologie 1161, Animal Health Laboratory, INRA, ANSES, Ecole Nationale Vétérinaire d'Alfort, Université Paris-Est, 94701 Maisons-Alfort CEDEX, France.
| | - Sarah I Bonnet
- UMR BIPAR, Animal Health Laboratory, INRA, ANSES, Ecole Nationale Vétérinaire d'Alfort, Université Paris-Est, 94701 Maisons-Alfort CEDEX, France.
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4
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Abreu MRD, Pereira MC, Simioni PU, Nodari EF, Paiatto LN, Camargo-Mathias MI. Immunomodulatory and morphophysiological effects of Rhipicephalus sanguineus s. l. (Acari: Ixodidae) salivary gland extracts. Vet Immunol Immunopathol 2018; 207:36-45. [PMID: 30593349 DOI: 10.1016/j.vetimm.2018.11.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2018] [Revised: 10/03/2018] [Accepted: 11/23/2018] [Indexed: 02/02/2023]
Abstract
Rhipicephalus sanguineus s. l. is popularly known as the "brown dog tick" since dogs are its preferential hosts, but the species has been reported to parasitize other mammals, including humans, with significant medical-veterinary importance since it transmits several important pathogenic agents during the feeding period. The tick saliva is a complex mixture that has several functions, including the capability to modulate the hemostatic, inflammatory and immunologic systems of the host, allowing pathogens to settle. Despite knowledge about the immunosuppressive action of tick saliva, little is known about the mechanisms involved in this process and the morphophysiological effects caused by exposure to the salivary gland extract, taking into consideration the different periods of the glandular cycle. Thus, the objective of this study was to analyze the in vitro effects of salivary gland extracts obtained from R. sanguineus s. l. females fed on host rabbits for two (SGE2 - Salivary Gland Extracts of 2 days) and four days (SGE4 - Salivary Gland Extracts of 4 days) on J774 cells (monocyte macrophage cell line) and verify the occurrence of morphological and immunomodulatory alterations in these cells when exposed to different concentrations of these extracts. The results showed that: (i) SGE2 and SGE4 at the concentration of 4 μg/mL presented cytotoxicity to the J774 cells exposed for 24 and 48 hours; (ii) SGE2 at the concentrations of 2 μg/mL(48-hour exposure) and 1 μg/mL (24-hour exposure) and SGE4 at the concentrations of 2 and 1 μg/mL (48-hour exposure) showed proinflammatory activity, confirmed by the increased secretion of NO and proinflammatory cytokine (IL-2), and the presence of morphological characteristics detected by microscopy; and (iii) SGE2 and SGE4 at the concentrations of 0.5 and 0.1 μg/mL had immunomodulatory activity, demonstrated by decreases in the secretion of NO and proinflammatory cytokines (IL2, IL-6 and TNF-α) and increase in the synthesis of IL-10, confirmed by the morphophysiological analysis. These unprecedented data are extremely relevant for future research to identify the processes involved in the ectoparasite-host relationship, as well to develop more efficient tick control strategies.
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Affiliation(s)
- Marina Rodrigues de Abreu
- Biology Department, Biosciences Institute, São Paulo State University (UNESP), Avenida 24 A, 1515, 13506-900 Rio Claro, SP, Brazil
| | - Melissa Carolina Pereira
- Biology Department, Biosciences Institute, São Paulo State University (UNESP), Avenida 24 A, 1515, 13506-900 Rio Claro, SP, Brazil
| | - Patrícia Ucelli Simioni
- Biology Department, Biosciences Institute, São Paulo State University (UNESP), Avenida 24 A, 1515, 13506-900 Rio Claro, SP, Brazil; Department of Biomedical Science, Faculty of Americana, FAM, Americana, SP, Brazil
| | - Elen Fernanda Nodari
- Biology Department, Biosciences Institute, São Paulo State University (UNESP), Avenida 24 A, 1515, 13506-900 Rio Claro, SP, Brazil
| | | | - Maria Izabel Camargo-Mathias
- Biology Department, Biosciences Institute, São Paulo State University (UNESP), Avenida 24 A, 1515, 13506-900 Rio Claro, SP, Brazil.
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Islam MS, You MJ. Expression Patterns of Host Inflammatory Cytokine Genes during Infestation with Haemaphysalis longicornis, a Zoonotic Vector, in Blood Sucking Periods. THE KOREAN JOURNAL OF PARASITOLOGY 2018. [PMID: 29529851 PMCID: PMC5858668 DOI: 10.3347/kjp.2018.56.1.53] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Tick saliva is critically important for continuous attachment to the host, blood feeding for days, and transmission of tick-borne pathogens. To characterize the patterns of inflammatory cytokine gene expression during its attachment and blood sucking time, peripheral blood samples of rabbits infested with Haemaphysalis longicornis ticks were collected at different intervals. Blood histamine concentration was evaluated as well as gene encoding IFN-γ, TNF-α, IL-2, IL-6, IL-4, and IL-10 were compared with non-infested rabbits. Blood histamine concentration of tick-infested rabbits during fast feeding time was significantly higher than that of non-infested rabbits. In both nymph and adult tick infested rabbits, expression of TNF-α and IFN-γ genes were decreased significantly (P<0.05), while expression of IL-4, IL-6, and IL-10 were increased 1.3 to 7 folds in adult infested rabbits with the exception of IL-6 that was significantly (P<0.05) decreased in nymph infested rabbits. IL-2 was not expressed in either nymph or adult infestation. H. longicornis saliva is capable of modulate host responses through a complex correlation with histamine and Th1, Th2 mediated cytokines that suppress the inflammatory responses directed toward inflammatory mediators introduced into the host during tick feeding.
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Affiliation(s)
- Mohammad Saiful Islam
- Department of Medicine, Surgery & Obstetrics, Faculty of Veterinary and Animal Science, Hajee Mohammad Danesh Science and Technology University, Dinajpur-5200, Bangladesh.,Laboratory of Veterinary Parasitology, College of Veterinary Medicine and Bio-safety Research Centre, Chonbuk National University, Iksan 54596, Korea
| | - Myung-Jo You
- Laboratory of Veterinary Parasitology, College of Veterinary Medicine and Bio-safety Research Centre, Chonbuk National University, Iksan 54596, Korea
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Rodrigues V, Fernandez B, Vercoutere A, Chamayou L, Andersen A, Vigy O, Demettre E, Seveno M, Aprelon R, Giraud-Girard K, Stachurski F, Loire E, Vachiéry N, Holzmuller P. Immunomodulatory Effects of Amblyomma variegatum Saliva on Bovine Cells: Characterization of Cellular Responses and Identification of Molecular Determinants. Front Cell Infect Microbiol 2018; 7:521. [PMID: 29354598 PMCID: PMC5759025 DOI: 10.3389/fcimb.2017.00521] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Accepted: 12/07/2017] [Indexed: 12/25/2022] Open
Abstract
The tropical bont tick, Amblyomma variegatum, is a tick species of veterinary importance and is considered as one of major pest of ruminants in Africa and in the Caribbean. It causes direct skin lesions, transmits heartwater, and reactivates bovine dermatophilosis. Tick saliva is reported to affect overall host responses through immunomodulatory and anti-inflammatory molecules, among other bioactive molecules. The general objective of this study was to better understand the role of saliva in interaction between the Amblyomma tick and the host using cellular biology approaches and proteomics, and to discuss its impact on disease transmission and/or activation. We first focused on the immuno-modulating effects of semi-fed A. variegatum female saliva on bovine peripheral blood mononuclear cells (PBMC) and monocyte-derived macrophages in vitro. We analyzed its immuno-suppressive properties by measuring the effect of saliva on PBMC proliferation, and observed a significant decrease in ConA-stimulated PBMC lymphoproliferation. We then studied the effect of saliva on bovine macrophages using flow cytometry to analyze the expression of MHC-II and co-stimulation molecules (CD40, CD80, and CD86) and by measuring the production of nitric oxide (NO) and pro- or anti-inflammatory cytokines. We observed a significant decrease in the expression of MHC-II, CD40, and CD80 molecules, associated with decreased levels of IL-12-p40 and TNF-α and increased level of IL-10, which could explain the saliva-induced modulation of NO. To elucidate these immunomodulatory effects, crude saliva proteins were analyzed using proteomics with an Orbitrap Elite mass spectrometer. Among the 336 proteins identified in A. variegatum saliva, we evidenced bioactive molecules exhibiting anti-inflammatory, immuno-modulatory, and anti-oxidant properties (e.g., serpins, phospholipases A2, heme lipoprotein). We also characterized an intriguing ubiquitination complex that could be involved in saliva-induced immune modulation of the host. We propose a model for the interaction between A. variegatum saliva and host immune cells that could have an effect during tick feeding by favoring pathogen dissemination or activation by reducing the efficiency of host immune response to the corresponding tick-borne diseases.
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Affiliation(s)
- Valérie Rodrigues
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement, UMR ASTRE "Animal, Santé, Territoire, Risques et Ecosystèmes,"Montpellier, France.,ASTRE, Université de Montpellier (I-MUSE), CIRAD, Institut National de la Recherche Agronomique, Montpellier, France
| | - Bernard Fernandez
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement, UMR ASTRE "Animal, Santé, Territoire, Risques et Ecosystèmes,"Montpellier, France.,ASTRE, Université de Montpellier (I-MUSE), CIRAD, Institut National de la Recherche Agronomique, Montpellier, France
| | - Arthur Vercoutere
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement, UMR ASTRE "Animal, Santé, Territoire, Risques et Ecosystèmes,"Montpellier, France.,ASTRE, Université de Montpellier (I-MUSE), CIRAD, Institut National de la Recherche Agronomique, Montpellier, France
| | - Léo Chamayou
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement, UMR ASTRE "Animal, Santé, Territoire, Risques et Ecosystèmes,"Montpellier, France.,ASTRE, Université de Montpellier (I-MUSE), CIRAD, Institut National de la Recherche Agronomique, Montpellier, France
| | - Alexandre Andersen
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement, UMR ASTRE "Animal, Santé, Territoire, Risques et Ecosystèmes,"Montpellier, France.,ASTRE, Université de Montpellier (I-MUSE), CIRAD, Institut National de la Recherche Agronomique, Montpellier, France
| | - Oana Vigy
- Institut de Génomique Fonctionnelle, Centre Nationnal de la Recherche Scientifique, Institut National de la Santé et de la Recherche Médicale, Université de Montpellier, Montpellier, France
| | - Edith Demettre
- BioCampus Montpellier, Centre Nationnal de la Recherche Scientifique, Institut National de la Santé et de la Recherche Médicale, Université de Montpellier, Montpellier, France
| | - Martial Seveno
- BioCampus Montpellier, Centre Nationnal de la Recherche Scientifique, Institut National de la Santé et de la Recherche Médicale, Université de Montpellier, Montpellier, France
| | - Rosalie Aprelon
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement, UMR ASTRE "Animal, Santé, Territoire, Risques et Ecosystèmes,"Montpellier, France.,CIRAD, UMR ASTRE, Petit-Bourg, Guadeloupe, France
| | - Ken Giraud-Girard
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement, UMR ASTRE "Animal, Santé, Territoire, Risques et Ecosystèmes,"Montpellier, France.,CIRAD, UMR ASTRE, Petit-Bourg, Guadeloupe, France
| | - Frédéric Stachurski
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement, UMR ASTRE "Animal, Santé, Territoire, Risques et Ecosystèmes,"Montpellier, France.,ASTRE, Université de Montpellier (I-MUSE), CIRAD, Institut National de la Recherche Agronomique, Montpellier, France
| | - Etienne Loire
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement, UMR ASTRE "Animal, Santé, Territoire, Risques et Ecosystèmes,"Montpellier, France.,ASTRE, Université de Montpellier (I-MUSE), CIRAD, Institut National de la Recherche Agronomique, Montpellier, France
| | - Nathalie Vachiéry
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement, UMR ASTRE "Animal, Santé, Territoire, Risques et Ecosystèmes,"Montpellier, France.,ASTRE, Université de Montpellier (I-MUSE), CIRAD, Institut National de la Recherche Agronomique, Montpellier, France.,CIRAD, UMR ASTRE, Petit-Bourg, Guadeloupe, France
| | - Philippe Holzmuller
- Centre de Coopération Internationale en Recherche Agronomique pour le Développement, UMR ASTRE "Animal, Santé, Territoire, Risques et Ecosystèmes,"Montpellier, France.,ASTRE, Université de Montpellier (I-MUSE), CIRAD, Institut National de la Recherche Agronomique, Montpellier, France
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7
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Schoeler GB, Wikel SK. Modulation of host immunity by haematophagous arthropods. ANNALS OF TROPICAL MEDICINE AND PARASITOLOGY 2016. [DOI: 10.1080/00034983.2001.11813695] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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8
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Scholl DC, Embers ME, Caskey JR, Kaushal D, Mather TN, Buck WR, Morici LA, Philipp MT. Immunomodulatory effects of tick saliva on dermal cells exposed to Borrelia burgdorferi, the agent of Lyme disease. Parasit Vectors 2016; 9:394. [PMID: 27391120 PMCID: PMC4938952 DOI: 10.1186/s13071-016-1638-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Accepted: 06/10/2016] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND The prolonged feeding process of ixodid ticks, in combination with bacterial transmission, should lead to a robust inflammatory response at the blood-feeding site. Yet, factors present in tick saliva may down-regulate such responses, which may be beneficial to spirochete transmission. The primary goal of this study was to test the hypothesis that tick saliva, in the context of Borrelia burgdorferi, can have widespread effects on the production of immune mediators in skin. METHODS A cross-section of tick feeding on skin was examined histologically. Human THP-1 cells stimulated with B. burgdorferi and grown in the presence or absence of tick saliva were examined by human DNA microarray, cytokine bead array, sandwich ELISA, and qRT-PCR. Similar experiments were also conducted using dermal fibroblasts. RESULTS Tick feeding on skin showed dermal infiltration of histiocytes and granulocytes at the bite location. Changes in monocytic transcript levels during co-culture with B. burgdorferi and saliva indicated that tick saliva had a suppressive effect on the expression of certain pro-inflammatory mediators, such as IL-8 (CXCL8) and TLR2, but had a stimulatory effect on specific molecules such as the Interleukin 10 receptor, alpha subunit (IL-10RA), a known mediator of the immunosuppressive signal of IL-10. Stimulated cell culture supernatants were analyzed via antigen-capture ELISA and cytokine bead array for inflammatory mediator production. Treatment of monocytes with saliva significantly reduced the expression of several key mediators including IL-6, IL-8 and TNF-alpha. Tick saliva had an opposite effect on dermal fibroblasts. Rather than inhibiting, saliva enhanced production of pro-inflammatory mediators, including IL-8 and IL-6 from these sentinel skin cells. CONCLUSIONS The effects of ixodid tick saliva on resident skin cells is cell type-dependent. The response to both tick and pathogen at the site of feeding favors pathogen transmission, but may not be wholly suppressed by tick saliva.
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Affiliation(s)
- Dorothy C. Scholl
- />Divisions of Bacteriology and Parasitology, Tulane National Primate Research Center, Covington, LA USA
- />Present Address: Department of Biology, University of New Mexico, Albuquerque, NM USA
| | - Monica E. Embers
- />Divisions of Bacteriology and Parasitology, Tulane National Primate Research Center, Covington, LA USA
| | - John R. Caskey
- />Divisions of Bacteriology and Parasitology, Tulane National Primate Research Center, Covington, LA USA
| | - Deepak Kaushal
- />Divisions of Bacteriology and Parasitology, Tulane National Primate Research Center, Covington, LA USA
| | - Thomas N. Mather
- />Center for Vector-Borne Disease, University of Rhode Island, Kingston, RI USA
| | - Wayne R. Buck
- />Comparative Pathology, Tulane National Primate Research Center, Covington, Louisiana USA
- />Present Address: AbbVie, 1 N Waukegan Rd, North Chicago, IL USA
| | - Lisa A. Morici
- />Department of Microbiology and Immunology, Tulane University Medical School, New Orleans, LA USA
| | - Mario T. Philipp
- />Divisions of Bacteriology and Parasitology, Tulane National Primate Research Center, Covington, LA USA
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9
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Wei L, Huang C, Yang H, Li M, Yang J, Qiao X, Mu L, Xiong F, Wu J, Xu W. A potent anti-inflammatory peptide from the salivary glands of horsefly. Parasit Vectors 2015; 8:556. [PMID: 26496724 PMCID: PMC4619319 DOI: 10.1186/s13071-015-1149-y] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Accepted: 10/07/2015] [Indexed: 01/11/2023] Open
Abstract
Background A diverse group of physiologically active peptides/proteins are present in the salivary glands of horsefly Tabanus yao (Diptera, Tabanidae) that facilitate acquisition of blood meal. However, their roles in the regulation of local inflammation remains poorly understood. Methods Induction expression profiles of immune-related molecules in the salivary glands of T. yao was analyzed by quantitative PCR (qPCR) after bacterial feeding. A significantly up-regulated molecule (cecropin-TY1) was selected for anti-inflammatory assay in lipopolysaccharide (LPS)-stimulated mouse peritoneal macrophages. The transcription levels of inducible NO synthase (iNOS) and pro-inflammatory cytokines were quantified by qPCR. Nitric oxide (NO) production was determined by Griess reagent. Pro-inflammatory cytokine production was determined by an enzyme-linked immunosorbent assay (ELISA). The inflammatory signals were assayed by Western blotting analysis. The secondary structure of cecropin-TY1 was measured by Circular dichroism (CD) spectroscopy. Interaction of cecropin-TY1 with LPS was evaluated by the dissociation of fluorescein isothiocyanate (FITC)-conjugated LPS aggregates and neutralization of LPS determined by a quantitative Chromogenic End-point Tachypleus amebocyte lysate (TAL) assay kit. Homology modeled structure analysis and mutation of key residues/structures were performed to understand its structure-activity relationship. Results Cecropin-TY1 was demonstrated to possess high anti-inflammatory activity and low cytotoxicity toward mouse macrophages. In LPS-stimulated mouse peritoneal macrophage, addition of cecropin-TY1 significantly inhibited the production of nitric oxide (NO) and pro-inflammatory cytokines. Further study revealed that cecropin-TY1 inhibited inflammatory cytokine production by blocking activation of mitogen-activated protein kinases (MAPKs) and transcriptional nuclear factor-κB (NF-κB) signals. Cecropin-TY1 even interacted with LPS and neutralized LPS. The secondary structure analysis revealed that cecropin-TY1 adopted unordered structures in hydrophobic environment but converted to α-helical confirmation in membrane mimetic environments. Homology modeled structure analysis demonstrated that cecropin-TY1 adopted two α-helices (Leu3-Thr24, Ile27-Leu38) linked by a hinge (Leu25-Pro26) and the structure surface was partly positively charged. Structure-activity relationship analysis indicated that several key residues/structures are crucial for its anti-inflammatory activity including α-helices, aromatic residue Trp2, positively charged residues Lys and Arg, hinge residue Pro26 and N-terminal amidation. Conclusions We found a novel anti-inflammatory function of horsefly-derived cecropin-TY1 peptide, laying groundwork for better understanding the ectoparasite-host interaction of horsefly with host and highlighting its potency in anti-inflammatory therapy for sepsis and endotoxin shock caused by Gram-negative bacterial infections. Electronic supplementary material The online version of this article (doi:10.1186/s13071-015-1149-y) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Lin Wei
- Jiangsu Key Laboratory of Infection and Immunity, Institutes of Biology and Medical Sciences, Soochow University, 199 Ren-Ai Road, Suzhou Industrial Park, Suzhou, 215123, Jiangsu Province, China.
| | - Chunjing Huang
- Jiangsu Key Laboratory of Infection and Immunity, Institutes of Biology and Medical Sciences, Soochow University, 199 Ren-Ai Road, Suzhou Industrial Park, Suzhou, 215123, Jiangsu Province, China.
| | - Hailong Yang
- School of Basic Medical Sciences, Kunming Medical University, 1168 West Chunrong Road, Yuhua Avenue, Chenggong District, Kunming, 650500, Yunnan Province, China.
| | - Min Li
- Jiangsu Key Laboratory of Infection and Immunity, Institutes of Biology and Medical Sciences, Soochow University, 199 Ren-Ai Road, Suzhou Industrial Park, Suzhou, 215123, Jiangsu Province, China.
| | - Juanjuan Yang
- College of Biological Science and Technology, Fuzhou University, Fuzhou, 350108, Fujian, China.
| | - Xue Qiao
- Institute of Marine Biological Technology, School of Life Science and Biotechnology, Dalian University of Technology, Dalian, 116024, Liaoning, China.
| | - Lixian Mu
- School of Basic Medical Sciences, Kunming Medical University, 1168 West Chunrong Road, Yuhua Avenue, Chenggong District, Kunming, 650500, Yunnan Province, China.
| | - Fei Xiong
- Jiangsu Key Laboratory of Infection and Immunity, Institutes of Biology and Medical Sciences, Soochow University, 199 Ren-Ai Road, Suzhou Industrial Park, Suzhou, 215123, Jiangsu Province, China.
| | - Jing Wu
- School of Basic Medical Sciences, Kunming Medical University, 1168 West Chunrong Road, Yuhua Avenue, Chenggong District, Kunming, 650500, Yunnan Province, China.
| | - Wei Xu
- Jiangsu Key Laboratory of Infection and Immunity, Institutes of Biology and Medical Sciences, Soochow University, 199 Ren-Ai Road, Suzhou Industrial Park, Suzhou, 215123, Jiangsu Province, China.
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Kotál J, Langhansová H, Lieskovská J, Andersen JF, Francischetti IMB, Chavakis T, Kopecký J, Pedra JHF, Kotsyfakis M, Chmelař J. Modulation of host immunity by tick saliva. J Proteomics 2015; 128:58-68. [PMID: 26189360 PMCID: PMC4619117 DOI: 10.1016/j.jprot.2015.07.005] [Citation(s) in RCA: 138] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2015] [Revised: 06/30/2015] [Accepted: 07/12/2015] [Indexed: 12/14/2022]
Abstract
UNLABELLED Next generation sequencing and proteomics have helped to comprehensively characterize gene expression in tick salivary glands at both the transcriptome and the proteome level. Functional data are, however, lacking. Given that tick salivary secretions are critical to the success of the tick transmission lifecycle and, as a consequence, for host colonization by the pathogens they spread, we thoroughly review here the literature on the known interactions between tick saliva (or tick salivary gland extracts) and the innate and adaptive vertebrate immune system. The information is intended to serve as a reference for functional characterization of the numerous genes and proteins expressed in tick salivary glands with an ultimate goal to develop novel vector and pathogen control strategies. SIGNIFICANCE We overview all the known interactions of tick saliva with the vertebrate immune system. The provided information is important, given the recent developments in high-throughput transcriptomic and proteomic analysis of gene expression in tick salivary glands, since it may serve as a guideline for the functional characterization of the numerous newly-discovered genes expressed in tick salivary glands.
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Affiliation(s)
- Jan Kotál
- Faculty of Science, University of South Bohemia in České Budějovice, Budweis, Czech Republic; Laboratory of Genomics and Proteomics of Disease Vectors, Institute of Parasitology, Biology Centre, Czech Academy of Sciences, Budweis, Czech Republic
| | - Helena Langhansová
- Faculty of Science, University of South Bohemia in České Budějovice, Budweis, Czech Republic
| | - Jaroslava Lieskovská
- Faculty of Science, University of South Bohemia in České Budějovice, Budweis, Czech Republic
| | - John F Andersen
- Section of Vector Biology, Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Ivo M B Francischetti
- Section of Vector Biology, Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA
| | - Triantafyllos Chavakis
- Department of Clinical Pathobiochemistry, Technische Universität Dresden, Dresden, Germany
| | - Jan Kopecký
- Faculty of Science, University of South Bohemia in České Budějovice, Budweis, Czech Republic
| | - Joao H F Pedra
- Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Michail Kotsyfakis
- Laboratory of Genomics and Proteomics of Disease Vectors, Institute of Parasitology, Biology Centre, Czech Academy of Sciences, Budweis, Czech Republic.
| | - Jindřich Chmelař
- Faculty of Science, University of South Bohemia in České Budějovice, Budweis, Czech Republic; Department of Clinical Pathobiochemistry, Technische Universität Dresden, Dresden, Germany
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Braden LM, Koop BF, Jones SRM. Signatures of resistance to Lepeophtheirus salmonis include a TH2-type response at the louse-salmon interface. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2015; 48:178-91. [PMID: 25453579 DOI: 10.1016/j.dci.2014.09.015] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/20/2014] [Revised: 09/26/2014] [Accepted: 09/26/2014] [Indexed: 05/08/2023]
Abstract
Disease outbreaks with the salmon louse Lepeophtheirus salmonis cause significant economic losses in mariculture operations worldwide. Variable innate immune responses at the louse-attachment site contribute to differences in susceptibility among species such that members of Salmo spp. are more susceptible to infection than those of some Oncorhynchus spp. Relatively little is known about the mechanisms that contribute to disease resistance or susceptibility to L. salmonis in salmon. Here, we utilize histochemistry and transcriptomics in a comparative infection model with susceptible (Atlantic, sockeye) and resistant (coho) salmon. At least three cell populations (MHIIβ+, IL1β+, TNFα+) were activated in coho salmon skin during L. salmonis infection. Locally elevated expression of several pro-inflammatory mediators (e.g. IL1β, IL8, TNFα, COX2, C/EBPβ), and tissue repair enzymes (MMP9, MMP13) were detected in susceptible and resistant species. However, responses specific to coho salmon (e.g. IL4, IL6, TGFβ) or responses shared among susceptible salmon (e.g. SAP, TRF, Cath in Atlantic and sockeye salmon) provide evidence for species-specific pathways contributing to resistance or susceptibility, respectively. Our results confirm the importance of an early pro-inflammatory TH1-type pathway as an initial host response during infection with Pacific sea lice, and demonstrate subsequent regulatory TH2-type processes as candidate defense mechanisms in the skin of resistant coho salmon.
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Affiliation(s)
- Laura M Braden
- Centre for Biomedical Research, Department of Biology, University of Victoria, Victoria, British Columbia V8W 3N5, Canada
| | - Ben F Koop
- Centre for Biomedical Research, Department of Biology, University of Victoria, Victoria, British Columbia V8W 3N5, Canada
| | - Simon R M Jones
- Pacific Biological Station, 3190 Hammond Bay Road, Nanaimo, British Columbia V9T 6N7, Canada.
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12
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Ockenfels B, Michael E, McDowell MA. Meta-analysis of the effects of insect vector saliva on host immune responses and infection of vector-transmitted pathogens: a focus on leishmaniasis. PLoS Negl Trop Dis 2014; 8:e3197. [PMID: 25275509 PMCID: PMC4183472 DOI: 10.1371/journal.pntd.0003197] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2014] [Accepted: 08/18/2014] [Indexed: 11/18/2022] Open
Abstract
A meta-analysis of the effects of vector saliva on the immune response and progression of vector-transmitted disease, specifically with regard to pathology, infection level, and host cytokine levels was conducted. Infection in the absence or presence of saliva in naïve mice was compared. In addition, infection in mice pre-exposed to uninfected vector saliva was compared to infection in unexposed mice. To control for differences in vector and pathogen species, mouse strain, and experimental design, a random effects model was used to compare the ratio of the natural log of the experimental to the control means of the studies. Saliva was demonstrated to enhance pathology, infection level, and the production of Th2 cytokines (IL-4 and IL-10) in naïve mice. This effect was observed across vector/pathogen pairings, whether natural or unnatural, and with single salivary proteins used as a proxy for whole saliva. Saliva pre-exposure was determined to result in less severe leishmaniasis pathology when compared with unexposed mice infected either in the presence or absence of sand fly saliva. The results of further analyses were not significant, but demonstrated trends toward protection and IFN-γ elevation for pre-exposed mice. Arthropod vectors transmit a wide variety of diseases resulting in substantial human morbidity and economic costs worldwide. When hematophagous arthropods blood feed, they release saliva into the host. This saliva elicits a strong immune response and has recently been a focus for vaccine research. There is evidence that the saliva enhances infection in naïve hosts, but that prior exposure to saliva results in less severe infection. This analysis endeavored to determine whether there was a statistically significant enhancement or protective effect with regard to saliva exposure and the progression of disease, and to determine the underlying immune mechanism driving these effects. We found that saliva does indeed enhance infection levels of vector-transmitted pathogens and leishmaniasis pathology in naïve mice and elevates Th2 cytokine levels (IL-4 and IL-10). We also determined that pre-exposure to saliva results in less severe pathology of experimental leishmaniasis in mice. These results are important for vaccine trials and vector control programs, though more studies are needed with regard to pre-exposure.
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Affiliation(s)
- Brittany Ockenfels
- Eck Institute for Global Health, Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana, United States of America
| | - Edwin Michael
- Eck Institute for Global Health, Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana, United States of America
| | - Mary Ann McDowell
- Eck Institute for Global Health, Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana, United States of America
- * E-mail:
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Slámová M, Skallová A, Páleníková J, Kopecký J. Effect of tick saliva on immune interactions between Borrelia afzelii and murine dendritic cells. Parasite Immunol 2012; 33:654-60. [PMID: 21910742 DOI: 10.1111/j.1365-3024.2011.01332.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Interaction between mouse dendritic cells (DCs) and Borrelia afzelii spirochetes was monitored on three different levels: phagocytosis of spirochetes by DCs, production of cytokines by Borrelia-stimulated DCs and the ability of Borrelia-exposed DCs to activate specific CD4+ T lymphocytes. The effect of Ixodes ricinus tick saliva on each of these interactions was examined. Tick saliva was shown to decrease the number of phagocytosing DCs. The ability of Borrelia-exposed DCs to induce both proliferation and IL-2 production by specific CD4+ T cells was significantly reduced by tick saliva. And surprisingly, we have shown an inhibitory effect of tick saliva on the production of both Th1 (TNF-α and IL-6) and Th2 (IL-10) cytokines by DCs. Our data reveal a complex inhibitory effect of tick saliva on Borrelia-DCs interaction.
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Affiliation(s)
- M Slámová
- Department of Medical Biology, Faculty of Science, University of South Bohemia, České Budějovice, Czech Republic
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Heinze DM, Wikel SK, Thangamani S, Alarcon-Chaidez FJ. Transcriptional profiling of the murine cutaneous response during initial and subsequent infestations with Ixodes scapularis nymphs. Parasit Vectors 2012; 5:26. [PMID: 22309607 PMCID: PMC3293053 DOI: 10.1186/1756-3305-5-26] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2011] [Accepted: 02/06/2012] [Indexed: 12/29/2022] Open
Abstract
BACKGROUND Ixodes scapularis ticks are hematophagous arthropods capable of transmitting many infectious agents to humans. The process of blood feeding is an extended and continuous interplay between tick and host responses. While this process has been studied extensively in vitro, no global understanding of the host response to ticks has emerged. METHODS To address this issue, we used PCR-arrays to measure skin-specific expression of 233 discrete genes at 8 time points during primary and secondary infestations of mice with pathogen-free I. scapularis nymphs. Selected results were then validated at the mRNA and protein levels by additional real-time PCR and bioplex assay. RESULTS Primary infestation was characterized by the late induction of an innate immune response. Lectin pattern recognition receptors, cytokines, and chemokines were upregulated consistent with increased neutrophil and macrophage migration. Gene ontology and pathway analyses of downregulated genes suggested inhibition of gene transcription and Th17 immunity. During the secondary infestation, additional genes were modulated suggesting a broader involvement of immune cells including CD8 and CD4 positive T lymphocytes. The cytokine response showed a mixed Th1/Th2 profile with a potential for T regulatory cell activity. Key gene ontology clusters observed during the secondary infestation were cell migration and activation. Matrix metalloproteinases were upregulated, apoptosis-related genes were differentially modulated, and immunoreceptor signaling molecules were upregulated. In contrast, transcripts related to mitogenic, WNT, Hedgehog, and stress pathways were downregulated. CONCLUSIONS Our results support a model of tick feeding where lectin pattern recognition receptors orchestrate an innate inflammatory response during primary infestation that primes a mixed Th1/Th2 response upon secondary exposure. Tick feeding inhibits gene transcription and Th17 immunity. Salivary molecules may also inhibit upregulation of mitogenic, WNT, Hedgehog, and stress pathways and enhance the activity of T regulatory cells, production of IL-10, and suppressors of cytokine signaling molecules (SOCS). This study provides the first comprehensive transcriptional analysis of the murine host response at the I. scapularis bite site and suggests both a potential model of the host cutaneous response and candidate genes for further description and investigation.
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Affiliation(s)
- Dar M Heinze
- Department of Pathology, University of Texas Medical Branch, Galveston, Texas 77555, USA
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LIESKOVSKÁ J, KOPECKÝ J. Tick saliva suppresses IFN signalling in dendritic cells upon Borrelia afzelii infection. Parasite Immunol 2011; 34:32-9. [DOI: 10.1111/j.1365-3024.2011.01345.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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16
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An S, Ma D, Wei JF, Yang X, Yang HW, Yang H, Xu X, He S, Lai R. A novel allergen Tab y 1 with inhibitory activity of platelet aggregation from salivary glands of horseflies. Allergy 2011; 66:1420-7. [PMID: 21848516 DOI: 10.1111/j.1398-9995.2011.02683.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
BACKGROUND Horsefly sting causes allergic reactions in human body. However, our knowledge on horsefly allergens remains poor. OBJECTIVES To identify the novel horsefly allergens and characterize their properties. METHODS A native allergen protein Tab y 1 (apyrase) was purified from the salivary glands of the horsefly Tabanus yao Macquart by gel filtration and ion exchange chromatography. Its sequence was determined by Edman degradation and cDNA cloning. Its allergenicity was assessed by immunoblotting for specific IgE, basophil activation test, skin prick test (SPT), and competitive enzyme-linked immunosorbent assay (ELISA). RESULTS Tab y 1 showed a single diffusion band of 70 kDa on SDS-PAGE. Seventy percent (7/10) of patients with horsefly allergy tested positive to Tab y 1 in SPT; sera from 81% (30/37) of patients reacted to Tab y 1 on western blots. Purified Tab y 1 reduced approximately 42% sera IgE reactivity to horsefly salivary gland extract on a competitive ELISA. Tab y 1 upregulated the expression of CD63 and CCR3 on passively sensitized basophils by up to approximately 4.9-fold. Tab y 1 also showed enzymatic activity to hydrolyze ATP and ADP, and potent antiplatelet aggregation and antithrombotic activities. CONCLUSION The current work identified a novel major allergen of horsefly, Tab y 1, with antiplatelet aggregation and antithrombotic activities, which implicates Tab y 1 in helping horseflies suck host blood, meanwhile causing allergy in their human hosts.
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Affiliation(s)
- S An
- Biotoxin Units of Key Laboratory of Animal Models and Human Disease Mechanisms, Kunming Institute of Zoology, Chinese Academy of Sciences, China
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Ma D, Li Y, Dong J, An S, Wang Y, Liu C, Yang X, Yang H, Xu X, Lin D, Lai R. Purification and characterization of two new allergens from the salivary glands of the horsefly, Tabanus yao. Allergy 2011; 66:101-9. [PMID: 20608917 DOI: 10.1111/j.1398-9995.2010.02435.x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Horsefly bite can cause allergic reactions in humans. There is no information about allergenic horsefly proteins. OBJECTIVES The current work aims to purify and characterize IgE-binding proteins from horsefly salivary glands. METHODS Two IgE-binding proteins, Tab a 1 and Tab a 2 with molecular weight of 26 and 35 kd, respectively, were purified and characterized from 60,000 pairs of horsefly salivary glands of Tabanus yao, respectively. Their primary sequences were determined by Edman degradation and cDNA cloning. Their allergenicity was examined using enzyme-linked immunosorbent assay (ELISA), ELISA inhibition tests, and immunoblots. RESULTS Immunoblotting demonstrated IgE binding by 32 and 34 of 37 (86.5% and 91.8%) subjects' sera to Tab a 1 and Tab a 2, respectively. They were identified as an antigen 5-related (Ag 5) protein and hyaluronidase, respectively. ELISA inhibitions of serum IgE reactivity to the horsefly salivary gland extract (SGE) using purified Tab a 1 and Tab a 2 were significant (about 45%). In addition, these proteins showed some IgE-binding capacity to sera of subjects with wasp sting allergy. CONCLUSIONS We have first identified and characterized two IgE-binding proteins, Tab a 1, an Ag 5-like protein and Tab a 2, a hyaluronidase, from the horsefly salivary glands. They appear to be of importance for the allergic reactions induced by horsefly bite. These allergens are thus not only found in stinging but also found in hematophagous insects. These results also provided support for the presence of the so-called wasp-horsefly syndrome (WHS).
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Affiliation(s)
- D Ma
- Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan, China
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Schneider BS, Soong L, Coffey LL, Stevenson HL, McGee CE, Higgs S. Aedes aegypti saliva alters leukocyte recruitment and cytokine signaling by antigen-presenting cells during West Nile virus infection. PLoS One 2010; 5:e11704. [PMID: 20661470 PMCID: PMC2908538 DOI: 10.1371/journal.pone.0011704] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2010] [Accepted: 06/29/2010] [Indexed: 11/18/2022] Open
Abstract
West Nile virus (WNV) is transmitted during mosquito bloodfeeding. Consequently, the first vertebrate cells to contact WNV are cells in the skin, followed by those in the draining lymph node. Macrophages and dendritic cells are critical early responders in host defense against WNV infection, not just because of their role in orchestrating the immune response, but also because of their importance as sites of early peripheral viral replication. Antigen-presenting cell (APC) signals have a profound effect on host antiviral responses and disease severity. During transmission, WNV is intimately associated with mosquito saliva. Due to the ability of mosquito saliva to affect inflammation and immune responses, and the importance of understanding early events in WNV infection, we investigated whether mosquito saliva alters APC signaling during arbovirus infection, and if alterations in cell recruitment occur when WNV infection is initiated with mosquito saliva. Accordingly, experiments were performed with cultured dendritic cells and macrophages, flow cytometry was used to characterize infiltrating cell types in the skin and lymph nodes during early infection, and real-time RT-PCR was employed to evaluate virus and cytokine levels. Our in vitro results suggest that mosquito saliva significantly decreases the expression of interferon-beta and inducible nitric oxide synthase in macrophages (by as much as 50 and 70%, respectively), whilst transiently enhancing interleukin-10 (IL-10) expression. In vivo results indicate that the predominate effect of mosquito feeding is to significantly reduce the recruitment of T cells, leading the inoculation site of mice exposed to WNV alone to have up to 2.8 fold more t cells as mice infected in the presence of mosquito saliva. These shifts in cell population are associated with significantly elevated IL-10 and WNV (up to 4.0 and 10 fold, respectively) in the skin and draining lymph nodes. These results suggest that mosquito saliva dysregulates APC antiviral signaling, and reveal a possible mechanism for the observed enhancement of WNV disease mediated by mosquito saliva via a reduction of T lymphocyte and antiviral activity at the inoculation site, an elevated abundance of susceptible cell types, and a concomitant increase in immunoregulatory activity of IL-10.
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Affiliation(s)
- Bradley S. Schneider
- Department of Pathology, Center for Biodefense & Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, Texas, United States of America
| | - Lynn Soong
- Department of Pathology, Center for Biodefense & Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, Texas, United States of America
- Department of Microbiology and Immunology, University of Texas Medical Branch, Galveston, Texas, United States of America
| | - Lark L. Coffey
- Institut Pasteur, Department of Virology, Viral Populations and Pathogenesis Group, Paris, France
| | - Heather L. Stevenson
- Department of Pathology, Center for Biodefense & Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, Texas, United States of America
| | - Charles E. McGee
- Department of Pathology, Center for Biodefense & Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, Texas, United States of America
| | - Stephen Higgs
- Department of Pathology, Center for Biodefense & Emerging Infectious Diseases, University of Texas Medical Branch, Galveston, Texas, United States of America
- * E-mail:
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Zhao R, Yu X, Yu H, Han W, Zhai L, Han J, Liu J. Immunoregulatory peptides from salivary glands of the horsefly, Tabanus pleskei. Comp Biochem Physiol B Biochem Mol Biol 2009; 154:1-5. [PMID: 19332144 DOI: 10.1016/j.cbpb.2009.03.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2009] [Revised: 03/11/2009] [Accepted: 03/12/2009] [Indexed: 10/21/2022]
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Ma D, Wang Y, Yang H, Wu J, An S, Gao L, Xu X, Lai R. Anti-thrombosis repertoire of blood-feeding horsefly salivary glands. Mol Cell Proteomics 2009; 8:2071-9. [PMID: 19531497 PMCID: PMC2742439 DOI: 10.1074/mcp.m900186-mcp200] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2009] [Revised: 06/01/2009] [Indexed: 11/06/2022] Open
Abstract
Blood-feeding arthropods rely heavily on the pharmacological properties of their saliva to get a blood meal and suppress immune reactions of hosts. Little information is available on antihemostatic substances in horsefly salivary glands although their saliva has been thought to contain wide range of physiologically active molecules. In traditional Eastern medicine, horseflies are used as anti-thrombosis material for hundreds of years. By proteomics coupling transcriptome analysis with pharmacological testing, several families of proteins or peptides, which exert mainly on anti-thrombosis functions, were identified and characterized from 60,000 pairs of salivary glands of the horsefly Tabanus yao Macquart (Diptera, Tabanidae). They are: (I) ten fibrin(ogen)olytic enzymes, which hydrolyze specially alpha chain of fibrin(ogen) and are the first family of fibrin(ogen)olytic enzymes purified and characterized from arthropods; (II) another fibrin(ogen)olytic enzyme, which hydrolyzes both alpha and beta chain of fibrin(ogen); (III) ten Arg-Gly-Asp-motif containing proteins acting as platelet aggregation inhibitors; (IV) five thrombin inhibitor peptides; (V) three vasodilator peptides; (VI) one apyrase acting as platelet aggregation inhibitor; (VII) one peroxidase with both platelet aggregation inhibitory and vasodilator activities. The first three families are belonging to antigen five proteins, which show obvious similarity with insect allergens. They are the first members of the antigen 5 family found in salivary glands of blood sucking arthropods to have anti-thromobosis function. The current results imply a possible evolution from allergens of blood-sucking insects to anti-thrombosis agents. The extreme diversity of horsefly anti-thrombosis components also reveals the anti-thrombosis molecular mechanisms of the traditional Eastern medicine insect material.
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Affiliation(s)
- Dongying Ma
- From the ‡Biotoxin Units of Key Laboratory of Animal Models and Human Disease Mechanisms, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, Yunnan, China
- §Graduate School of the Chinese Academy of Sciences, Beijing 100009, China
| | - Yipeng Wang
- From the ‡Biotoxin Units of Key Laboratory of Animal Models and Human Disease Mechanisms, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, Yunnan, China
- §Graduate School of the Chinese Academy of Sciences, Beijing 100009, China
| | - Hailong Yang
- From the ‡Biotoxin Units of Key Laboratory of Animal Models and Human Disease Mechanisms, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, Yunnan, China
- §Graduate School of the Chinese Academy of Sciences, Beijing 100009, China
| | - Jing Wu
- From the ‡Biotoxin Units of Key Laboratory of Animal Models and Human Disease Mechanisms, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, Yunnan, China
- §Graduate School of the Chinese Academy of Sciences, Beijing 100009, China
| | - Shu An
- ‖School of Life Sciences, University of Science and Technology of China, Hefei, Anhui, 230026, China, and
- §Graduate School of the Chinese Academy of Sciences, Beijing 100009, China
| | - Li Gao
- From the ‡Biotoxin Units of Key Laboratory of Animal Models and Human Disease Mechanisms, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, Yunnan, China
- §Graduate School of the Chinese Academy of Sciences, Beijing 100009, China
| | - Xueqing Xu
- From the ‡Biotoxin Units of Key Laboratory of Animal Models and Human Disease Mechanisms, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, Yunnan, China
- §Graduate School of the Chinese Academy of Sciences, Beijing 100009, China
| | - Ren Lai
- From the ‡Biotoxin Units of Key Laboratory of Animal Models and Human Disease Mechanisms, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, Yunnan, China
- **Life Sciences College of Nanjing Agricultural University, Nanjing 210095, Jiangsu, China
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Ma D, Gao L, An S, Song Y, Wu J, Xu X, Lai R. A horsefly saliva antigen 5-like protein containing RTS motif is an angiogenesis inhibitor. Toxicon 2009; 55:45-51. [PMID: 19635491 DOI: 10.1016/j.toxicon.2009.06.038] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2009] [Revised: 06/25/2009] [Accepted: 06/26/2009] [Indexed: 11/28/2022]
Abstract
The Ag5 proteins are the most abundant and immunogenic proteins in the venom secretory ducts of stinging insects. An antigen 5-like protein (named tabRTS) composed of 221 amino acid residues was purified and characterized from the salivary glands of the horsefly, Tabanus yao (Diptera, Tabanidae). Its cDNA was cloned from the cDNA library of the horsefly's salivary gland. TabRTS containing the SCP domain (Sc7 family of extracellular protein domain) was found in insect antigen 5 proteins. More interestingly, there is an Arg-Thr-Ser (RTS) disintegrin motif at the C-terminus of tabRTS. The RTS motif is positioned in a loop bracketed by cysteine residues as those found in RTS-disintegrins of Crotalidae and Viperidae snake venoms, which act as angiogenesis inhibitors. Endothelial Cell Tube formation assay in vitro and chicken chorioallantoic membrane (CAM) angiogenesis assay in vivo were performed as to investigate the effect of tabRTS on angiogenesis. It was found that tabRTS could significantly inhibit angiogenesis in vitro and in vivo. Anti-alpha(1)beta(1) monoclonal antibody could dose-dependently inhibit the anti-angiogenic activity of tabRTS. This result indicated that tabRTS possibly targets the alpha(1)beta(1) integrin to exert the anti-angiogenic activity as snake venom RTS-/KTS-disintegrins do. The current work revealed the first angiogenesis inhibitor protein containing RTS motif from invertebrates, a possible novel type of RTS-disintegrin.
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Affiliation(s)
- Dongying Ma
- Biotoxin Units of Key Laboratory of Animal Models and Human Disease Mechanisms, Kunming Institute of Zoology, Chinese Academy of Sciences, 32# Jiaochangdonglu, Kunming 650223, Yunnan, China
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22
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Grigorieva LA, Amosova LI. Morphofunctional changes of salivary glands of female ixodid ticks of subfamilies Ixodinae and Amblyomminae (Acari: Ixodidae) during feeding and their significance. J EVOL BIOCHEM PHYS+ 2009. [DOI: 10.1134/s0022093008060100] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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23
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Tick saliva affects both proliferation and distribution of Borrelia burgdorferi spirochetes in mouse organs and increases transmission of spirochetes to ticks. Int J Med Microbiol 2009; 299:373-80. [PMID: 19147403 DOI: 10.1016/j.ijmm.2008.10.009] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2008] [Revised: 10/22/2008] [Accepted: 10/25/2008] [Indexed: 11/21/2022] Open
Abstract
Ixodes ricinus tick saliva-activated transmission of Borrelia burgdorferi sensu stricto spirochetes was studied on the C3H/HeN mouse model. The influence of the feeding of uninfected nymphs on the proliferation and distribution of intradermally inoculated spirochetes was compared with the effect of co-inoculated saliva or salivary gland extract (SGE), respectively. Spirochete loads in murine tissues were evaluated using real-time q-PCR. SGE induced significantly increased spirochete numbers in the skin on the days 4 and 6 post-infection (p.i.). On the other hand, decreased bacterial load in the heart of SGE-treated mice was demonstrated in comparison with control animals. The inoculation of tick saliva increased spirochete load in the urinary bladder on day 6 p.i., while the number of spirochetes in the heart declined on day 6 p.i. The feeding of I. ricinus nymphs raised the spirochete load in the bladder on the days 4 and 6 p.i. On day 6, the number of spirochetes found in the heart was significantly lower than in controls. The prevalence of spirochetes in ticks infected by feeding on mice was more than 10 times higher when the mice were infected with the mixture of spirochetes and saliva or SGE, in comparison with spirochetes alone. The presence of SGE in the infectious inoculum increased the spirochete burden per tick from 0 to almost 28,000. Taken together, these results show a very early effect of tick saliva on the proliferation and distribution of Borrelia spirochetes in the host, probably due to the effect of saliva on the host innate immunity mechanisms.
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24
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Juncadella IJ, Anguita J. The immunosuppresive tick salivary protein, Salp15. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2009; 666:121-31. [PMID: 20054980 DOI: 10.1007/978-1-4419-1601-3_10] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The interaction between Ixodid ticks and their mammalian hosts is a complex relationship. While the mammalian host tries to avoid the completion of the feeding process, the tick has devised strategies to counteract these attempts. Tick saliva contains a vast array of pharmacological activities that presumably aid the tick to evade host responses, including anticomplement, oxidative and innate and adaptive immune responses. The characterization of these activities has gained momentum in the last several years. One of the best studied activities present in tick saliva corresponds to the antigen known as Salp15, which binds specifically to the T-cell coreceptor CD4 resulting in the specific repression of CD4+ T-cell activation. We discuss here the current state of our knowledge of the mode of action of this salivary protein.
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Affiliation(s)
- Ignacio J Juncadella
- Department of Veterinary and Animal Sciences, University of Massachusetts Amherst, Amherst, MA 01003, USA
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25
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Menten-Dedoyart C, Couvreur B, Thellin O, Drion PV, Herry M, Jolois O, Heinen E. Influence of the Ixodes ricinus tick blood-feeding on the antigen-specific antibody response in vivo. Vaccine 2008; 26:6956-64. [PMID: 18930098 DOI: 10.1016/j.vaccine.2008.09.072] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2008] [Revised: 09/09/2008] [Accepted: 09/17/2008] [Indexed: 10/21/2022]
Abstract
The blood meal of hard ticks such as Ixodes ricinus lasts several days. This is made possible by tick salivary factors that inhibit inflammation, haemostasis and the host immune response. We assessed the latter on a model of immune response in vivo. A significant reduction of specific IgM and IgG levels was observed in BALB/c mice infested 5 days before injection with bovine serum albumin (BSA) and QuilA but not in mice infested 5 days after the immunization. This effect was not observed in mock-infested mice and could not be attributed to the use of anesthetics. The antibody response was not merely delayed and the Th(1)/Th(2) balance appeared not altered. T-dependent zones and germinal centers in lymph nodes draining the tick bite site showed no apparent morphological alterations or shift in T cell subpopulations. However, the spleens of tick-infested mice had also an enlarged red pulp, indicating an increased extramedullary haematopoietic activity.
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Affiliation(s)
- C Menten-Dedoyart
- Laboratory of Human Histology, University of Liege, Avenue de l'Hopital 1, B-4000 Liege, Belgium.
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Zeidner NS, Schneider BS, Rutherford JS, Dolan MC. Suppression of Th2 Cytokines Reduces Tick-Transmitted Borrelia burgdorferi Load in Mice. J Parasitol 2008; 94:767-9. [DOI: 10.1645/ge-1416.1] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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28
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Yan X, Feng H, Yu H, Yang X, Liu J, Lai R. An immunoregulatory peptide from salivary glands of the horsefly, Hybomitra atriperoides. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2008; 32:1242-1247. [PMID: 18502504 DOI: 10.1016/j.dci.2008.04.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2008] [Revised: 04/15/2008] [Accepted: 04/15/2008] [Indexed: 05/26/2023]
Abstract
Horseflies are economically important blood-feeding arthropods and also a nuisance for humans, and vectors for filariasis. They rely heavily on the pharmacological propriety of their saliva to get blood meal and suppress immune reactions of hosts. Little information is available on horsefly immune suppressants. By high-performance liquid chromatography (HPLC) purification coupling with pharmacological testing, an immunoregulatory peptide named immunoregulin HA has been identified and characterized from salivary glands of the horsefly of Hybomitra atriperoides (Diptera, Tabanidae). Immunoregulin HA could inhibit the secretion of interferon-gamma (IFN-gamma) and monocyte chemoattractant protein (MCP-1) and increase the secretion of interleukin-10 (IL-10) induced by lipopolysaccharide (LPS) in rat splenocytes. IL-10 is a suppressor cytokine of T-cell proliferative and cytokine responses. IL-10 can inhibit the elaboration of pro-inflammatory cytokines. Immunoregulin HA possibly unregulated the IL-10 production to inhibit IFN-gamma and MCP-1 secretion in the current experiments. This immunosuppression may facilitate the blood feeding of this horsefly. The current works will facilitate to understand the molecular mechanisms of the ectoparasite-host relationship.
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Affiliation(s)
- Xiuwen Yan
- College of Life Sciences School of Heibei Normal University, Shijiazhuang, Hebei 050016, China
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29
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Zeidner NS, Schneider BS, Rutherford JS, Dolan MC. Suppression of Th2 Cytokines Reduces Tick-Transmitted Borrelia burgdorferi Load in Mice. J Parasitol 2008. [DOI: 10.1645/ge-1416r.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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30
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Xu X, Yang H, Ma D, Wu J, Wang Y, Song Y, Wang X, Lu Y, Yang J, Lai R. Toward an understanding of the molecular mechanism for successful blood feeding by coupling proteomics analysis with pharmacological testing of horsefly salivary glands. Mol Cell Proteomics 2007; 7:582-90. [PMID: 18087067 DOI: 10.1074/mcp.m700497-mcp200] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Horseflies are economically important blood-feeding arthropods and also a nuisance for humans and vectors for filariasis. They rely heavily on the pharmacological properties of their saliva to get a blood meal and suppress immune reactions of hosts. Little information is available on antihemostatic substances in horsefly salivary glands; especially no horsefly immune suppressants have been reported. By proteomics or peptidomics and coupling transcriptome analysis with pharmacological testing, several families of proteins or peptides, which act mainly on the hemostatic system or immune system of the host, were identified and characterized from 30,000 pairs salivary glands of the horsefly Tabanus yao (Diptera, Tabanidae). They are: (i) a novel family of inhibitors of platelet aggregation including two members, which possibly inhibit platelet aggregation by a novel mechanism and act on platelet membrane, (ii) a novel family of immunosuppressant peptides including 12 members, which can inhibit interferon-gamma production and increase interleukin-10 secretion, (iii) a serine protease inhibitor with 56 amino acid residues containing anticoagulant activity, (iv) a serine protease with anticoagulant activity, (v) a protease with fibrinogenolytic activity, (vi) three families of antimicrobial peptides including six members, (vii) a hyaluronidase, (viii) a vasodilator peptide, which is an isoform of vasotab identified from Hybomitra bimaculata, and interestingly (ix) two metallothioneins, which are the first metallothioneins reported from invertebrate salivary glands. The current work will facilitate the understanding of the molecular mechanisms of the ectoparasite-host relationship and help in identifying novel vaccine targets and novel leading pharmacological compounds.
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Affiliation(s)
- Xueqing Xu
- Biotoxin Units of Key Laboratory of Animal Models and Human Disease Mechanisms, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming 650223, Yunnan, China
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31
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In vitro splenocyte proliferation responses of BALB/c mice to salivary gland extracts of three ixodid tick species (Acari: Ixodidae). Biologia (Bratisl) 2007. [DOI: 10.2478/s11756-007-0141-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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Koník P, Slavíková V, Salát J, Reznícková J, Dvoroznáková E, Kopecký J. Anti-tumour necrosis factor-? activity in Ixodes ricinus saliva. Parasite Immunol 2006; 28:649-56. [PMID: 17096644 DOI: 10.1111/j.1365-3024.2006.00899.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Tumour necrosis factor-alpha (TNF-alpha) is one of the most prominent inflammatory mediators playing a central role in starting off the inflammatory reactions of the innate immune system. We identified a TNF-alpha-inhibitory activity in the saliva and salivary gland extract (SGE) from partially fed Ixodes ricinus ticks. Using mouse and human TNF-alpha specific ELISA, we showed that tick saliva or SGE markedly reduced the level of detectable cytokine. Both saliva and SGE inhibited the cytotoxic effect of TNF-alpha in a bioassay. Elimination of the TNF-alpha-inhibitory activity in SGE by trypsin digestion demonstrated that the anti-TNF-alpha factor is a protein. Fast protein liquid chromatography fractionation of SGE showed one peak of TNF-alpha-inhibitory activity corresponding to a protein with estimated molecular mass 23 kDa. The likely mechanism of the inhibitory effect is a direct binding of the cytokine. The TNF-alpha-inhibitory molecule seems to play an important role in the anti-inflammatory effect of tick saliva at the tick feeding site, providing a gateway to the host for tick-borne pathogens.
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Affiliation(s)
- P Koník
- Faculty of Biological Sciences, University of South Bohemia, Ceské Budejovice, Czech Republic
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33
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Caljon G, Van Den Abbeele J, Stijlemans B, Coosemans M, De Baetselier P, Magez S. Tsetse fly saliva accelerates the onset of Trypanosoma brucei infection in a mouse model associated with a reduced host inflammatory response. Infect Immun 2006; 74:6324-30. [PMID: 16954393 PMCID: PMC1695494 DOI: 10.1128/iai.01046-06] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Tsetse flies (Glossina sp.) are the vectors that transmit African trypanosomes, protozoan parasites that cause human sleeping sickness and veterinary infections in the African continent. These blood-feeding dipteran insects deposit saliva at the feeding site that enables the blood-feeding process. Here we demonstrate that tsetse fly saliva also accelerates the onset of a Trypanosoma brucei infection. This effect was associated with a reduced inflammatory reaction at the site of infection initiation (reflected by a decrease of interleukin-6 [IL-6] and IL-12 mRNA) as well as lower serum concentrations of the trypanocidal cytokine tumor necrosis factor. Variant-specific surface glycoprotein-specific antibody isotypes immunoglobulin M (IgM) and IgG2a, implicated in trypanosome clearance, were not suppressed. We propose that tsetse fly saliva accelerates the onset of trypanosome infection by inhibiting local and systemic inflammatory responses involved in parasite control.
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Affiliation(s)
- Guy Caljon
- Unit of Cellular and Molecular Immunology, Flanders Interuniversity Institute for Biotechnology (VIB), Vrije Universiteit Brussel (VUB), Pleinlaan 2, B-1050 Brussels, Belgium.
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34
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Macháčková M, Oborník M, Kopecký J. Effect of salivary gland extract from Ixodes ricinus ticks on the proliferation of Borrelia burgdorferi sensu stricto in vivo. Folia Parasitol (Praha) 2006. [DOI: 10.14411/fp.2006.020] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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35
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Titus RG, Bishop JV, Mejia JS. The immunomodulatory factors of arthropod saliva and the potential for these factors to serve as vaccine targets to prevent pathogen transmission. Parasite Immunol 2006; 28:131-41. [PMID: 16542315 DOI: 10.1111/j.1365-3024.2006.00807.x] [Citation(s) in RCA: 84] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
In general, attempts to develop vaccines for pathogens transmitted by arthropods have met with little or no success. It has been widely observed that the saliva of arthropods that transmit disease enhances the infectivity of pathogens the arthropod transmits to the vertebrate host. Indeed, it has been observed that vaccinating against components of the saliva of arthropods or against antigens expressed in the gut of arthropods can protect the host from infection and decrease the viability of the arthropod. These results suggest that multi-subunit vaccines that target the pathogen itself as well as arthropod salivary gland components and arthropod gut antigens may be the most effective at controlling arthropod-borne pathogens as these vaccines would target several facets of the lifecycle of the pathogen. This review covers known immunomodulators in arthropod salivary glands, instances when arthropod saliva has been shown to enhance infection and a limited number of examples of antiarthropod vaccines, with emphasis on three arthropods: sandflies, mosquitoes and hard ticks.
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Affiliation(s)
- R G Titus
- Department of Microbiology, Immunology and Pathology, Colorado State University, 80523, USA
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36
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Fikrig E, Narasimhan S. Borrelia burgdorferi–Traveling incognito? Microbes Infect 2006; 8:1390-9. [PMID: 16698304 DOI: 10.1016/j.micinf.2005.12.022] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2005] [Accepted: 12/26/2005] [Indexed: 01/13/2023]
Abstract
We outline in this review how Borrelia burgdorferi, the causative agent of Lyme disease, moves from the tick to the vertebrate host, and what molecules are potentially involved in this challenging commute. The survival strategies utilized by the spirochete during transmission and the initial stages of infection are discussed.
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Affiliation(s)
- Erol Fikrig
- Section of Rheumatology, Department of Medicine, Yale University School of Medicine, Room 525A, 300 Cedar Street, New Haven, CT 06520-8031, USA.
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37
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Severinová J, Salát J, Krocová Z, Reznícková J, Demová H, Horká H, Kopecký J. Co-inoculation of Borrelia afzelii with tick salivary gland extract influences distribution of immunocompetent cells in the skin and lymph nodes of mice. Folia Microbiol (Praha) 2006; 50:457-63. [PMID: 16475508 DOI: 10.1007/bf02931430] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The impact of Ixodes ricinus salivary gland extract (SGE) on inflammatory changes in the skin and draining lymph nodes of mice, elicited by the infection with the important human pathogen, B. afzelii, was determined using flow cytometry. SGE injected together with spirochetes reduced the numbers of leukocytes and gammadelta-T lymphocytes in infected epidermis at early time-points post infection. In draining lymph nodes, the anti-inflammatory effect of SGE was manifested by the decrease of total cell count compared with that in mice treated with inactivated SGE. Changes in subpopulations of immunocompetent cells apparently reflected the effect of SGE on the proliferation of spirochetes in the host. The significance of tick saliva anti-inflammatory effect for saliva activated transmission of B. afzelii is shown.
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Affiliation(s)
- J Severinová
- Institute of Parasitology, Academy of Sciences of the Czech Republic and Faculty of Biological Sciences, University of South Bohemia, 370 05 Ceské Budĕjovice, Czechia
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38
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Summers BA, Straubinger AF, Jacobson RH, Chang YF, Appel MJG, Straubinger RK. Histopathological Studies of Experimental Lyme Disease in the Dog. J Comp Pathol 2005; 133:1-13. [PMID: 15904927 DOI: 10.1016/j.jcpa.2004.11.006] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2004] [Accepted: 11/30/2004] [Indexed: 10/25/2022]
Abstract
Experimental borrelia infection was induced in 62 specific--pathogen-free beagle dogs by exposure to Ixodes scapularis ticks harbouring the spirochaete Borrelia burgdorferi. Clinical signs of Lyme disease occurred in 39/62 dogs, the remaining 23 being subclinically infected. Clinical signs consisted of one to six episodes of transitory lameness with joint swelling and pain, most commonly affecting the elbow or shoulder joints. The polymerase chain reaction and culture demonstrated that the dogs remained infected for up to 581 days. At necropsy, gross findings consisted of lymphadenopathy in the area of tick attachment. Microscopical changes consisted of effusive fibrinosuppurative inflammation or nonsuppurative inflammation, or both, affecting synovial membranes, joint capsules and associated tendon sheaths. Plasma cells dominated areas of chronic inflammation, with CD3(+) T cells being present in lesser numbers. Microscopical signs of arthritis were polyarticular and more widespread than indicated by clinical signs, and most of the subclinically affected animals also had synovitis. In areas of tick attachment to the skin, hyperkeratosis and a mixture of suppurative and nonsuppurative dermatitis were encountered. Lymphadenopathy in superficial lymph nodes resulted from follicular and parafollicular hyperplasia. In 14/62 dogs, lymphoplasmacytic periarteritis and perineuritis were noted, resembling lesions found in human Lyme disease and syphilis, in which an underlying microangiopathy has been proposed.
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Affiliation(s)
- B A Summers
- Department of Biomedical Sciences, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853-6401, USA
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39
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Pechová J, Kopecký J, Salát J. Effect of tick salivary gland extract on the cytokine production by mouse epidermal cells. Folia Parasitol (Praha) 2004. [DOI: 10.14411/fp.2004.046] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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40
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Abstract
When feeding on vertebrate host ticks (ectoparasitic arthropods and potential vectors of bacterial, rickettsial, protozoal, and viral diseases) induce both innate and specific acquired host-immune reactions as part of anti-tick defenses. In a resistant host immune defense can lead to reduced tick viability, sometimes resulting in tick death. Tick responds to the host immune attack by secreting saliva containing pharmacologically active molecules and modulating host immune response. Tick saliva-effected immunomodulation at the attachment site facilitates both tick feeding and enhances the success of transmission of pathogens from tick into the host. On the other hand, host immunization with antigens from tick saliva can induce anti-tick resistance and is seen to be able to induce immunity against pathogens transmitted by ticks. Many pharmacological properties of saliva described in ticks are shared widely among other blood-feeding arthropods.
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Affiliation(s)
- L Kovár
- Institute of Microbiology, Academy of Sciences of the Czech Republic, 142 20 Prague, Czechia.
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41
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Boppana DKV, Dhinakar Raj G, John L, Wikel SK, Latha BR, Gomathinayagam S. In vivo immunomodulatory effects of ixodid ticks on ovine circulating T- and B-lymphocytes. Parasite Immunol 2004; 26:83-93. [PMID: 15225295 DOI: 10.1111/j.0141-9838.2004.00687.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Selected aspects of the ovine immune system were examined during the course of repeated infestations with the ixodid ticks, Haemaphysalis bispinosa and Hyalomma anatolicum anatolicum that naturally infest sheep, either individually or together. By the use of flow cytometry it was shown that total T-lymphocyte numbers were significantly reduced from the sixth through the ninth days of all infestations. Gamma/delta (gammadelta+) and CD8+ T-lymphocytes were significantly depleted during tick feeding in all infested groups. CD4+ T-lymphocyte levels were significantly increased during secondary H. bispinosa and mixed species infestations. Hyalomma anatolicum anatolicum caused a significant increase in circulating B-lymphocytes over several days in both initial and secondary infestations. All infested sheep had increased CD4/CD8 and decreased T/B lymphocyte ratios during exposure to both ticks. Bromodeoxyuridine (BrdU) ELISA was used to measure in vitro proliferation of peripheral blood mononuclear cells stimulated with the T-lymphocyte mitogen Concanavalin A (Con A) after their collection from infested sheep. Significant suppression of in vitro proliferation occurred during first and secondary infestations with H. bispinosa, H. a. anatolicum and with both tick species together, beginning on the sixth day of infestation in all cases. These important tick species of sheep significantly modulate the numbers of immune effector cells and proliferation of T-lymphocytes derived from infested animals.
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Affiliation(s)
- Dharmendra K V Boppana
- Department of Veterinary Parasitology, Madras Veterinary College, Tamil Nadu Veterinary and Animal Sciences University, Chenai, India.
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42
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Fast MD, Ross NW, Craft CA, Locke SJ, MacKinnon SL, Johnson SC. Lepeophtheirus salmonis: characterization of prostaglandin E2 in secretory products of the salmon louse by RP-HPLC and mass spectrometry. Exp Parasitol 2004; 107:5-13. [PMID: 15208032 DOI: 10.1016/j.exppara.2004.04.001] [Citation(s) in RCA: 54] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2003] [Revised: 01/21/2004] [Accepted: 04/06/2004] [Indexed: 11/29/2022]
Abstract
Lepeophtheirus salmonis is an ectoparasitic copepod that causes serious disease outbreaks in both wild and farmed salmonids. As the relationship between L. salmonis and its hosts is not well understood, the current investigation was undertaken to investigate whether any immunomodulatory compounds could be identified from secretions of L. salmonis. By incubating live L. salmonis adults with the neurotransmitter dopamine in seawater, we were able to obtain secretions from the parasite. These were analyzed by RP-HPLC column, as well as LC-MS. L. salmonis secretions contained a compound with the same retention time and mass of PGE(2). The identity of this compound as PGE(2) was confirmed by MS-in source dissociation. The concentrations of PGE(2) in L. salmonis secretions ranged from 0.2 to 12.3 ng/individual and varied with incubation temperature and time kept off the host. Prostaglandin E(2) is a potent vasodilator and thought to aid in parasite evasion from host immune responses. This is the first reported evidence of prostaglandin production in parasitic copepod secretions and its implications for the host-parasite relationship are discussed.
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Affiliation(s)
- M D Fast
- Department of Biology, Dalhousie University, Halifax, NS, Canada.
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Borjesson DL, Simon SI, Hodzic E, DeCock HEV, Ballantyne CM, Barthold SW. Roles of neutrophil beta 2 integrins in kinetics of bacteremia, extravasation, and tick acquisition of Anaplasma phagocytophila in mice. Blood 2003; 101:3257-64. [PMID: 12480703 DOI: 10.1182/blood-2002-04-1019] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Tick saliva contains anti-inflammatory and immunosuppressive substances that facilitate blood feeding and enhance tick-vectored pathogen transmission, including Anaplasma phagocytophila an etiologic agent of granulocytic ehrlichiosis. As such, inflammation at a tick-feeding site is strikingly different than that typically observed at other sites of inflammation. Up-regulation of CD11b/CD18 occurs in host granulocytes following interaction or infection with A phagocytophila, and the absence of CD11b/CD18 results in early increases in bacteremia. We hypothesized that beta 2 integrin-dependent infection kinetics and leukocyte extravasation are important determinants of neutrophil trafficking to, and pathogen acquisition at, tick-feeding sites. A phagocytophila infection kinetics were evaluated in CD11a/CD18, CD11b/CD18, and CD18 knock-out mice using quantitative polymerase chain reaction (PCR) of blood, ticks, and skin biopsies in conjunction with histopathology. A marked increase in the rate of A phagocytophila infection of neutrophils and pathogen burden in blood followed tick feeding. Infection kinetics were modified by beta 2 integrin expression and systemic neutrophil counts. Significant neutrophil-pathogen trafficking was observed to both suture and tick sites. Despite the prominent role for beta 2 integrins in neutrophil arrest in flowing blood, successful pathogen acquisition by ticks occurred in the absence of beta 2 integrins. Establishment of feeding pools that rely less on leukocyte trafficking and more on small hemorrhages may explain the ready amplification of A phagocytophila DNA from ticks infested on CD11/CD18-deficient mouse strains.
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Affiliation(s)
- Dori L Borjesson
- Center for Comparative Medicine, Schools of Medicine Veterinary Medicine, University of California, Davis 95616, USA
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Krocová Z, Macela A, Hernychová L, Kroca M, Pechová J, Kopecký J. Tick salivary gland extract accelerates proliferation of Francisella tularensis in the host. J Parasitol 2003; 89:14-20. [PMID: 12659297 DOI: 10.1645/0022-3395(2003)089[0014:tsgeap]2.0.co;2] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
Accelerated proliferation of the tick-borne bacterial pathogen Francisella tularensis was demonstrated in mice when the bacterium was injected together with salivary gland extract from Ixodes ricinus ticks. A significant increase in the numbers of bacteria was recorded in the dermal site of infection,the draining lymph nodes, and the spleen. Analysis of the expression of cytokine messenger ribonucleic acids showed polarization toward a Th2 profile. Salivary gland extract-mediated suppression of interleukin-12 and interferon-gamma, the cytokines required for the expression of the protective immunity against tularemic infection, apparently contributed to the decreased resistance against this tick-transmitted pathogen.
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Affiliation(s)
- Z Krocová
- Institute for Radiobiology and Immunology, Purkyne Military Medical Academy, 500 01 Hradec Králové, Czech Republic.
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Matsumoto K, Inokuma H, Okuda M, Onishi T. Effects of salivary gland extract from Rhipicephalus sanguineus on IgG subclass production and cytokine mRNA expression in mononuclear cells of canine peripheral blood. J Vet Med Sci 2003; 65:137-40. [PMID: 12576721 DOI: 10.1292/jvms.65.137] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The effects of salivary gland extract (SGE) from R. sanguineus were examined on the production of IgG1 and IgG2 and the mRNA expression of IFN-gamma, IL-2, IL-4, IL-5 and IL-10 in the mononuclear cells from canine peripheral blood, treated with concanavalin A (ConA) in vitro. SGE suppressed the ConA-induced production of IgG2. It also inhibited the expression of IFN-gamma, IL-2 and IL-5 mRNA in a dose-dependent manner. No dose-dependent suppression was observed of IL-10 mRNA expression although a significant effect was observed at a SGE protein concentration of 25 microg/ml. SGE had no effect on the mRNA expression of IL-4. These results suggest that the suppression of IgG2 production by SGE from R. sanguineus was caused by the suppression of IFN-gamma production.
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Affiliation(s)
- Koutaro Matsumoto
- Laboratory of Veterinary Internal Medicine, Faculty of Agriculture, Yamaguchi University, Japan
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Hannier S, Liversidge J, Sternberg JM, Bowman AS. Ixodes ricinus tick salivary gland extract inhibits IL-10 secretion and CD69 expression by mitogen-stimulated murine splenocytes and induces hyporesponsiveness in B lymphocytes. Parasite Immunol 2003; 25:27-37. [PMID: 12753435 DOI: 10.1046/j.1365-3024.2003.00605.x] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Tick saliva contains immunosuppressive factors allowing this blood-feeding ectoparasite to remain on hosts and enhancing pathogen transmission. In this study, we examined the modulation of mitogen-induced activation of naive murine splenocytes by the saliva and salivary gland extract (SGE) of I. ricinus ticks. We found that saliva-specific factors reduced IL-10 production by both concanavalin A (ConA) and lipopolysaccharide (LPS) stimulated splenocytes. The LPS-induced IL-10 production is 10 times more sensitive to SGE than the ConA-induced IL-10 production. Flow cytometric analysis determined that SGE particularly inhibited B (B220+) cell IL-10 production in mitogen-stimulated splenocyte preparations. Moreover, SGE reduced the early activation marker CD69 expression on ConA-activated T cells and also on B cells in presence of ConA or LPS. Annexin V and Via-probe staining demonstrated that SGE did not increase cell death in activated splenocytes and slightly decreased apoptosis in B lymphocytes. By employing assays with isolated B cells, we further showed that SGE had a direct effect on B cells and inhibited LPS-induced B cell proliferation. Taken together, our results indicate that salivary immunomodulators induce hyporesponsiveness to mitogen in both T and B cells, and that a direct B-cell inhibitory activity is present in tick saliva.
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MESH Headings
- Animals
- Antigens, CD/analysis
- Antigens, CD/metabolism
- Antigens, Differentiation, T-Lymphocyte/analysis
- Antigens, Differentiation, T-Lymphocyte/metabolism
- B-Lymphocytes/immunology
- Cell Extracts/pharmacology
- Cells, Cultured
- Concanavalin A/pharmacology
- Dose-Response Relationship, Drug
- Female
- Humans
- Interleukin-10/analysis
- Interleukin-10/biosynthesis
- Interleukin-10/metabolism
- Ixodes/chemistry
- Lectins, C-Type
- Lipopolysaccharides/pharmacology
- Lymphocyte Activation/drug effects
- Mice
- Mice, Inbred BALB C
- Mice, Inbred C3H
- Salivary Glands/chemistry
- Spleen/cytology
- Spleen/drug effects
- Spleen/immunology
- T-Lymphocytes/metabolism
- Time Factors
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Affiliation(s)
- Sigrid Hannier
- School of Biological Science (Zoology), University of Aberdeen, Aberdeen AB24 2TZ, Scotland, UK
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Narasimhan S, Koski RA, Beaulieu B, Anderson JF, Ramamoorthi N, Kantor F, Cappello M, Fikrig E. A novel family of anticoagulants from the saliva of Ixodes scapularis. INSECT MOLECULAR BIOLOGY 2002; 11:641-650. [PMID: 12421422 DOI: 10.1046/j.1365-2583.2002.00375.x] [Citation(s) in RCA: 77] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Using biochemical and molecular approaches, we have identified a 9.8 kDa protein in the saliva of Ixodes scapularis that inhibits the intrinsic pathway of coagulation. The 9.8 kDa anticoagulant protein was purified by reverse-phase HPLC and its N-terminal amino acid sequence determined. The N-terminal sequence showed homology with Salp14, an immuno-dominant antigen present in the saliva of engorging I. scapularis nymphs. Recombinant Salp14 expressed in Escherichia coli prolonged the activated partial thromboplastin time (APTT) of human plasma in a dose-dependent manner and was a specific inhibitor of factor Xa. A cDNA encoding a 9.3 kDa protein, Salp9Pac, was subsequently isolated from an I. scapularis salivary gland cDNA library. Salp9Pac showed 93% identity to the N-terminal sequence of the anticoagulant purified by HPLC. These data indicate that the anticoagulant protein purified by HPLC, Salp9Pac and Salp14 are members of a family of novel coagulation protease inhibitors present in tick saliva. While recombinant Salp9Pac did not show biological activity in the assays tested currently, it is likely to be mechanistically different from its paralogues. This raises the possibility that ticks may enhance their adaptive ability to cope with a wide spectrum of proteases, by transcribing such structurally related anticoagulant proteins with different functions.
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Affiliation(s)
- S Narasimhan
- Department of Internal Medicine, Yale University School of Medicine, New Haven, Connecticut 06520-8031, USA
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Turni C, Lee RP, Jackson LA. Effect of salivary gland extracts from the tick, Boophilus microplus, on leucocytes from Brahman and Hereford cattle. Parasite Immunol 2002; 24:355-61. [PMID: 12164821 DOI: 10.1046/j.1365-3024.2002.00471.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The effect of salivary gland extract (SGE) from Boophilus microplus on peripheral blood lymphocytes, neutrophils and monocytes from Brahman (Bos indicus) and Hereford (Bos taurus) cattle was investigated. SGE (8 micro g) significantly inhibited the proliferation response of lymphocytes to concanavalin A from both Brahman and Hereford cattle by 89% and 41%, respectively. The difference in inhibition between the two breeds was highly significant (P < 0.01), whilst at 1 micro g of SGE, significant inhibition of lymphocytes occurred only in Hereford cattle (34%). Flow cytometric analysis of monocytes and neutrophils showed that SGE (40 micro g) significantly reduced both the proportion of cells actively phagocytosing Escherichia coli labelled with fluorescein isothiocyanate (E. coli-FITC) and the uptake of E. coli-FITC in Brahman cattle. However, in Hereford cattle, a significant depression in uptake was only observed in neutrophils. The proportion of monocytes and neutrophils with oxidative activity was significantly suppressed in the presence of SGE in both breeds of cattle. These results indicate that peripheral blood leucocytes from different breeds of cattle respond differently to SGE.
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Affiliation(s)
- Cornelia Turni
- Department of Microbiology and Parasitology, University of Queensland, St Lucia, Queensland, Australia.
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Ribeiro JMC, Francischetti IMB. Role of arthropod saliva in blood feeding: sialome and post-sialome perspectives. ANNUAL REVIEW OF ENTOMOLOGY 2002; 48:73-88. [PMID: 12194906 DOI: 10.1146/annurev.ento.48.060402.102812] [Citation(s) in RCA: 503] [Impact Index Per Article: 22.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
This review addresses the problems insects and ticks face to feed on blood and the solutions these invertebrates engender to overcome these obstacles, including a sophisticated salivary cocktail of potent pharmacologic compounds. Recent advances in transcriptome and proteome research allow an unprecedented insight into the complexity of these compounds, indicating that their molecular diversity as well as the diversity of their targets is still larger than previously thought.
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Affiliation(s)
- Jose M C Ribeiro
- Medical Entomology Section, Laboratory of Malaria and Vector Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health, 4 Center Drive, Bethesda, Maryland, 20892-0425, USA.
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50
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Anguita J, Ramamoorthi N, Hovius JWR, Das S, Thomas V, Persinski R, Conze D, Askenase PW, Rincón M, Kantor FS, Fikrig E. Salp15, an ixodes scapularis salivary protein, inhibits CD4(+) T cell activation. Immunity 2002; 16:849-59. [PMID: 12121666 DOI: 10.1016/s1074-7613(02)00325-4] [Citation(s) in RCA: 194] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Tick saliva has pleiotropic properties that facilitate persistence of the arthropod upon the host. We now describe a feeding-inducible protein in Ixodes scapularis saliva, Salp15, that inhibits CD4(+) T cell activation. The mechanism involves the repression of calcium fluxes triggered by TCR ligation and results in lower production of interleukin-2. Salp15 also inhibits the development of CD4(+) T cell-mediated immune responses in vivo, demonstrating the functional importance of this protein. Salp15 provides a molecular basis for understanding the immunosuppressive activity of I. scapularis saliva and vector-host interactions.
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Affiliation(s)
- Juan Anguita
- Sections of Rheumatology, Yale University School of Medicine, New Haven, CT 06520, USA
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