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Gallego-Lopez GM, Lau AOT, Brown WC, Johnson WC, Ueti MW, Suarez CE. Spherical Body Protein 2 truncated copy 11 as a specific Babesia bovis attenuation marker. Parasit Vectors 2018. [PMID: 29530085 PMCID: PMC5848574 DOI: 10.1186/s13071-018-2782-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
- Gina M Gallego-Lopez
- Department of Veterinary Microbiology and Pathology, College of Veterinary Medicine, Washington State University, Pullman, WA, 99164-7040, USA
| | - Audrey O T Lau
- The National Institute of Allergy and Infectious Diseases, the National Institutes of Health, Rockville, MD, 20852, USA
| | - Wendy C Brown
- Department of Veterinary Microbiology and Pathology, College of Veterinary Medicine, Washington State University, Pullman, WA, 99164-7040, USA
| | - Wendell C Johnson
- Animal Disease Research Unit, Agricultural Research Service, USDA, Pullman, WA, 99164-6630, USA
| | - Massaro W Ueti
- Department of Veterinary Microbiology and Pathology, College of Veterinary Medicine, Washington State University, Pullman, WA, 99164-7040, USA.,Animal Disease Research Unit, Agricultural Research Service, USDA, Pullman, WA, 99164-6630, USA
| | - Carlos E Suarez
- Department of Veterinary Microbiology and Pathology, College of Veterinary Medicine, Washington State University, Pullman, WA, 99164-7040, USA. .,Animal Disease Research Unit, Agricultural Research Service, USDA, Pullman, WA, 99164-6630, USA.
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Zhang B, Cavallaro AS, Mody KT, Zhang J, Deringer JR, Brown WC, Mahony TJ, Yu C, Mitter N. Nanoparticle-Based Delivery of Anaplasma marginale Membrane Proteins; VirB9-1 and VirB10 Produced in the Pichia pastoris Expression System. Nanomaterials (Basel) 2016; 6:nano6110201. [PMID: 28335329 PMCID: PMC5245741 DOI: 10.3390/nano6110201] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/12/2016] [Revised: 10/21/2016] [Accepted: 10/28/2016] [Indexed: 01/24/2023]
Abstract
Bovine anaplasmosis or cattle-tick fever is a tick-borne haemolytic disease caused by the rickettsial haemoparasite Anaplasma marginale in tropical and subtropical areas of the world. While difficult to express, the proteins VirB9-1 and VirB10 are immunogenic components of the outer membrane type IV secretion system that have been identified as candidate antigens for vaccines targeting of A. marginale. Soluble VirB9-1 and VirB10 were successfully expressed using Pichia pastoris. When formulated with the self-adjuvanting silica vesicles, SV-100 (diameter: 50 nm, and pore entrance size: 6 nm), 200 µg of VirB9-1 and VirB10 were adsorbed per milligram of nanoparticle. The VirB9-1 and VirB10, SV-100 formulations were shown to induce higher antibody responses in mice compared to the QuilA formulations. Moreover, intracellular staining of selected cytokines demonstrated that both VirB9-1 and VirB10 formulations induced cell-mediated immune responses in mice. Importantly, the SV-100 VirB9-1 and VirB10 complexes were shown to specifically stimulate bovine T-cell linages derived from calves immunised with A. marginale outer membrane fractions, suggesting formulations will be useful for bovine immunisation and protection studies. Overall this study demonstrates the potential of self-adjuvanting silica vesicle formulations to address current deficiencies in vaccine delivery applications.
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Affiliation(s)
- Bing Zhang
- Department of Agriculture and Fisheries, Agri-Science Queensland, Animal Science, St Lucia, QLD 4072, Australia.
| | - Antonio S Cavallaro
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St Lucia, QLD 4072, Australia.
| | - Karishma T Mody
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St Lucia, QLD 4072, Australia.
| | - Jun Zhang
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, QLD 4072, Australia.
| | - James R Deringer
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164, USA.
| | - Wendy C Brown
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164, USA.
| | - Timothy J Mahony
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St Lucia, QLD 4072, Australia.
| | - Chengzhong Yu
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, QLD 4072, Australia.
| | - Neena Mitter
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St Lucia, QLD 4072, Australia.
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Zhao L, Mahony D, Cavallaro AS, Zhang B, Zhang J, Deringer JR, Zhao CX, Brown WC, Yu C, Mitter N, Middelberg APJ. Immunogenicity of Outer Membrane Proteins VirB9-1 and VirB9-2, a Novel Nanovaccine against Anaplasma marginale. PLoS One 2016; 11:e0154295. [PMID: 27115492 PMCID: PMC4846087 DOI: 10.1371/journal.pone.0154295] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Accepted: 04/12/2016] [Indexed: 11/25/2022] Open
Abstract
Anaplasma marginale is the most prevalent tick-borne livestock pathogen and poses a significant threat to cattle industry. In contrast to currently available live blood-derived vaccines against A. marginale, alternative safer and better-defined subunit vaccines will be of great significance. Two proteins (VirB9-1 and VirB9-2) from the Type IV secretion system of A. marginale have been shown to induce humoral and cellular immunity. In this study, Escherichia coli were used to express VirB9-1 and VirB9-2 proteins. Silica vesicles having a thin wall of 6 nm and pore size of 5.8 nm were used as the carrier and adjuvant to deliver these two antigens both as individual or mixed nano-formulations. High loading capacity was achieved for both proteins, and the mouse immunisation trial with individual as well as mixed nano-formulations showed high levels of antibody titres over 107 and strong T-cell responses. The mixed nano-formulation also stimulated high-level recall responses in bovine T-cell proliferation assays. These results open a promising path towards the development of efficient A. marginale vaccines and provide better understanding on the role of silica vesicles to deliver multivalent vaccines as mixed nano-formulations able to activate both B-cell and T-cell immunity, for improved animal health.
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Affiliation(s)
- Liang Zhao
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, QLD, 4072, Australia
| | - Donna Mahony
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St Lucia, QLD, 4072, Australia
| | - Antonino S. Cavallaro
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St Lucia, QLD, 4072, Australia
| | - Bing Zhang
- Animal Science, Queensland Department of Agriculture, Fisheries and Forestry, St Lucia, QLD, 4072, Australia
| | - Jun Zhang
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, QLD, 4072, Australia
| | - James R. Deringer
- Department of Veterinary Microbiology and Pathology, Washington State University, College of Veterinary Medicine, P.O. Box 647040, Pullman, WA, 99164–7040, United States of America
| | - Chun-Xia Zhao
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, QLD, 4072, Australia
| | - Wendy C. Brown
- Department of Veterinary Microbiology and Pathology, Washington State University, College of Veterinary Medicine, P.O. Box 647040, Pullman, WA, 99164–7040, United States of America
| | - Chengzhong Yu
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, QLD, 4072, Australia
| | - Neena Mitter
- Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St Lucia, QLD, 4072, Australia
- * E-mail: (NM); (APJM)
| | - Anton P. J. Middelberg
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, St Lucia, QLD, 4072, Australia
- * E-mail: (NM); (APJM)
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Abstract
Tick-transmitted gram-negative bacteria in the family Anaplasmataceae in the order Rickettsiales cause persistent infection and morbidity and mortality in ruminants. Whereas Anaplasma marginale infection is restricted to ruminants, Anaplasma phagocytophilum is promiscuous and, in addition to causing disease in sheep and cattle, notably causes disease in humans, horses, and dogs. Although the two pathogens invade and replicate in distinct blood cells (erythrocytes and neutrophils, respectively), they have evolved similar mechanisms of antigenic variation in immunodominant major surface protein 2 (MSP2) and MSP2(P44) that result in immune evasion and persistent infection. Furthermore, these bacteria have evolved distinct strategies to cause immune dysfunction, characterized as an antigen-specific CD4 T-cell exhaustion for A. marginale and a generalized immune suppression for A. phagocytophilum, that also facilitate persistence. This indicates highly adapted strategies of Anaplasma spp. to both suppress protective immune responses and evade those that do develop. However, conserved subdominant antigens are potential targets for immunization.
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Affiliation(s)
- Wendy C Brown
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington 99164;
| | - Anthony F Barbet
- Department of Infectious Diseases and Pathology, University of Florida, Gainesville, Florida 32611;
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5
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Ducken DR, Brown WC, Alperin DC, Brayton KA, Reif KE, Turse JE, Palmer GH, Noh SM. Subdominant Outer Membrane Antigens in Anaplasma marginale: Conservation, Antigenicity, and Protective Capacity Using Recombinant Protein. PLoS One 2015; 10:e0129309. [PMID: 26079491 PMCID: PMC4469585 DOI: 10.1371/journal.pone.0129309] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2014] [Accepted: 05/08/2015] [Indexed: 12/21/2022] Open
Abstract
Anaplasma marginale is a tick-borne rickettsial pathogen of cattle with a worldwide distribution. Currently a safe and efficacious vaccine is unavailable. Outer membrane protein (OMP) extracts or a defined surface protein complex reproducibly induce protective immunity. However, there are several knowledge gaps limiting progress in vaccine development. First, are these OMPs conserved among the diversity of A. marginale strains circulating in endemic regions? Second, are the most highly conserved outer membrane proteins in the immunogens recognized by immunized and protected animals? Lastly, can this subset of OMPs recognized by antibody from protected vaccinates and conserved among strains recapitulate the protection of outer membrane vaccines? To address the first goal, genes encoding OMPs AM202, AM368, AM854, AM936, AM1041, and AM1096, major subdominant components of the outer membrane, were cloned and sequenced from geographically diverse strains and isolates. AM202, AM936, AM854, and AM1096 share 99.9 to 100% amino acid identity. AM1041 has 97.1 to 100% and AM368 has 98.3 to 99.9% amino acid identity. While all four of the most highly conserved OMPs were recognized by IgG from animals immunized with outer membranes, linked surface protein complexes, or unlinked surface protein complexes and shown to be protected from challenge, the highest titers and consistent recognition among vaccinates were to AM854 and AM936. Consequently, animals were immunized with recombinant AM854 and AM936 and challenged. Recombinant vaccinates and purified outer membrane vaccinates had similar IgG and IgG2 responses to both proteins. However, the recombinant vaccinates developed higher bacteremia after challenge as compared to adjuvant-only controls and outer membrane vaccinates. These results provide the first evidence that vaccination with specific antigens may exacerbate disease. Progressing from the protective capacity of outer membrane formulations to recombinant vaccines requires testing of additional antigens, optimization of the vaccine formulation and a better understanding of the protective immune response.
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Affiliation(s)
- Deirdre R. Ducken
- Animal Disease Research Unit, Agricultural Research Service, U. S. Department of Agriculture, Pullman, Washington, United States of America
- Program in Vector-Borne Diseases, Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington, United States of America
| | - Wendy C. Brown
- Program in Vector-Borne Diseases, Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington, United States of America
| | - Debra C. Alperin
- Program in Vector-Borne Diseases, Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington, United States of America
| | - Kelly A. Brayton
- Program in Vector-Borne Diseases, Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington, United States of America
- Paul G. Allen School for Global Animal Health, Washington State University, Pullman, Washington, United States of America
| | - Kathryn E. Reif
- Program in Vector-Borne Diseases, Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington, United States of America
| | - Joshua E. Turse
- Program in Vector-Borne Diseases, Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington, United States of America
| | - Guy H. Palmer
- Paul G. Allen School for Global Animal Health, Washington State University, Pullman, Washington, United States of America
| | - Susan M. Noh
- Animal Disease Research Unit, Agricultural Research Service, U. S. Department of Agriculture, Pullman, Washington, United States of America
- Program in Vector-Borne Diseases, Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington, United States of America
- Paul G. Allen School for Global Animal Health, Washington State University, Pullman, Washington, United States of America
- * E-mail:
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Dossa RG, Alperin DC, Garzon D, Mealey RH, Brown WC, Jervis PJ, Besra GS, Cox LR, Hines SA. In contrast to other species, α-Galactosylceramide (α-GalCer) is not an immunostimulatory NKT cell agonist in horses. Dev Comp Immunol 2015; 49:49-58. [PMID: 25445911 DOI: 10.1016/j.dci.2014.11.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2014] [Revised: 11/06/2014] [Accepted: 11/06/2014] [Indexed: 06/04/2023]
Abstract
α-GalCer is a potent immunomodulatory molecule that is presented to NKT cells via the CD1 antigen-presenting system. We hypothesized that when used as an adjuvant α-GalCer would induce protective immune responses against Rhodococcus equi, an important pathogen of young horses. Here we demonstrate that the equine CD1d molecule shares most features found in CD1d from other species and has a suitable lipid-binding groove for presenting glycolipids to NKT cells. However, equine CTL stimulated with α-GalCer failed to kill cells infected with R. equi, and α-GalCer did not increase killing by CTL co-stimulated with R. equi antigen. Likewise, α-GalCer did not induce the lymphoproliferation of equine PBMC or increase the proliferation of R. equi-stimulated cells. Intradermal injection of α-GalCer in horses did not increase the recruitment of lymphocytes or cytokine production. Furthermore, α-GalCer-loaded CD1d tetramers, which have been shown to be broadly cross-reactive, did not bind equine lymphocytes. Altogether, our results demonstrate that in contrast to previously described species, horses are unable to respond to α-GalCer. This raises questions about the capabilities and function of NKT cells and other lipid-specific T lymphocytes in horses.
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Affiliation(s)
- Robson G Dossa
- Department of Veterinary Microbiology and Pathology, Washington State University, College of Veterinary Medicine, P.O. Box 647040, Pullman, WA 99164-7040, USA
| | - Debra C Alperin
- Department of Veterinary Microbiology and Pathology, Washington State University, College of Veterinary Medicine, P.O. Box 647040, Pullman, WA 99164-7040, USA
| | - Diana Garzon
- Unilever Centre for Molecular Science Informatics, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK
| | - Robert H Mealey
- Department of Veterinary Microbiology and Pathology, Washington State University, College of Veterinary Medicine, P.O. Box 647040, Pullman, WA 99164-7040, USA
| | - Wendy C Brown
- Department of Veterinary Microbiology and Pathology, Washington State University, College of Veterinary Medicine, P.O. Box 647040, Pullman, WA 99164-7040, USA
| | - Peter J Jervis
- School of Biosciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - Gurdyal S Besra
- School of Biosciences, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - Liam R Cox
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
| | - Stephen A Hines
- Department of Veterinary Microbiology and Pathology, Washington State University, College of Veterinary Medicine, P.O. Box 647040, Pullman, WA 99164-7040, USA.
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Abstract
Outer membrane protein preparations have been demonstrated to elicit protective immunity for Anaplasma marginale. Attempts to recreate this protective immunity using known surface proteins have been unsuccessful; therefore, novel outer membrane proteins have been searched for using a proteomic/genomic approach. Annotation of the whole genome sequence identified 62 outer membrane protein candidates based on sequence similarity to known surface proteins. In a proteomics approach for the identification of immunostimulatory outer membrane proteins, outer membrane preparations that were separated on 2D gels were used to immunize calves . Antisera from the calves were used to detect immunoreactive proteins, which were then selected and subjected to mass spectrometric analyses. These data were mapped back to the annotated A. marginale genome and have identified several new outer membrane proteins that are vaccine candidates.
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Affiliation(s)
- Kelly A Brayton
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99163-7040, USA.
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Abreu P, Aglietta M, Ahn EJ, Albuquerque IFM, Allard D, Allekotte I, Allen J, Allison P, Almeda A, Alvarez Castillo J, Alvarez-Muñiz J, Ambrosio M, Aminaei A, Anchordoqui L, Andringa S, Antičić T, Aramo C, Arganda E, Arqueros F, Asorey H, Assis P, Aublin J, Ave M, Avenier M, Avila G, Bäcker T, Balzer M, Barber KB, Barbosa AF, Bardenet R, Barroso SLC, Baughman B, Bäuml J, Beatty JJ, Becker BR, Becker KH, Bellétoile A, Bellido JA, Benzvi S, Berat C, Bertou X, Biermann PL, Billoir P, Blanco F, Blanco M, Bleve C, Blümer H, Boháčová M, Boncioli D, Bonifazi C, Bonino R, Borodai N, Brack J, Brogueira P, Brown WC, Bruijn R, Buchholz P, Bueno A, Burton RE, Caballero-Mora KS, Caramete L, Caruso R, Castellina A, Catalano O, Cataldi G, Cazon L, Cester R, Chauvin J, Cheng SH, Chiavassa A, Chinellato JA, Chirinos Diaz J, Chudoba J, Clay RW, Coluccia MR, Conceição R, Contreras F, Cook H, Cooper MJ, Coppens J, Cordier A, Coutu S, Covault CE, Creusot A, Criss A, Cronin J, Curutiu A, Dagoret-Campagne S, Dallier R, Dasso S, Daumiller K, Dawson BR, de Almeida RM, De Domenico M, De Donato C, de Jong SJ, De La Vega G, de Mello Junior WJM, de Mello Neto JRT, De Mitri I, de Souza V, de Vries KD, Decerprit G, del Peral L, del Río M, Deligny O, Dembinski H, Dhital N, Di Giulio C, Díaz Castro ML, Diep PN, Dobrigkeit C, Docters W, D'Olivo JC, Dong PN, Dorofeev A, dos Anjos JC, Dova MT, D'Urso D, Dutan I, Ebr J, Engel R, Erdmann M, Escobar CO, Espadanal J, Etchegoyen A, Facal San Luis P, Fajardo Tapia I, Falcke H, Farrar G, Fauth AC, Fazzini N, Ferguson AP, Ferrero A, Fick B, Filevich A, Filipčič A, Fliescher S, Fracchiolla CE, Fraenkel ED, Fröhlich U, Fuchs B, Gaior R, Gamarra RF, Gambetta S, García B, Garcia-Gamez D, Garcia-Pinto D, Gascon A, Gemmeke H, Gesterling K, Ghia PL, Giaccari U, Giller M, Glass H, Gold MS, Golup G, Gomez Albarracin F, Gómez Berisso M, Gonçalves P, Gonzalez D, Gonzalez JG, Gookin B, Góra D, Gorgi A, Gouffon P, Gozzini SR, Grashorn E, Grebe S, Griffith N, Grigat M, Grillo AF, Guardincerri Y, Guarino F, Guedes GP, Guzman A, Hague JD, Hansen P, Harari D, Harmsma S, Harrison TA, Harton JL, Haungs A, Hebbeker T, Heck D, Herve AE, Hojvat C, Hollon N, Holmes VC, Homola P, Hörandel JR, Horneffer A, Horvath P, Hrabovský M, Huege T, Insolia A, Ionita F, Italiano A, Jarne C, Jiraskova S, Josebachuili M, Kadija K, Kampert KH, Karhan P, Kasper P, Kégl B, Keilhauer B, Keivani A, Kelley JL, Kemp E, Kieckhafer RM, Klages HO, Kleifges M, Kleinfeller J, Knapp J, Koang DH, Kotera K, Krohm N, Krömer O, Kruppke-Hansen D, Kuehn F, Kuempel D, Kulbartz JK, Kunka N, La Rosa G, Lachaud C, Lauer R, Lautridou P, Le Coz S, Leão MSAB, Lebrun D, Lebrun P, Leigui de Oliveira MA, Lemiere A, Letessier-Selvon A, Lhenry-Yvon I, Link K, López R, Lopez Agüera A, Louedec K, Lozano Bahilo J, Lu L, Lucero A, Ludwig M, Lyberis H, Macolino C, Maldera S, Mandat D, Mantsch P, Mariazzi AG, Marin J, Marin V, Maris IC, Marquez Falcon HR, Marsella G, Martello D, Martin L, Martinez H, Martínez Bravo O, Mathes HJ, Matthews J, Matthews JAJ, Matthiae G, Maurizio D, Mazur PO, Medina-Tanco G, Melissas M, Melo D, Menichetti E, Menshikov A, Mertsch P, Meurer C, Mićanović S, Micheletti MI, Miller W, Miramonti L, Molina-Bueno L, Mollerach S, Monasor M, Monnier Ragaigne D, Montanet F, Morales B, Morello C, Moreno E, Moreno JC, Morris C, Mostafá M, Moura CA, Mueller S, Muller MA, Müller G, Münchmeyer M, Mussa R, Navarra G, Navarro JL, Navas S, Necesal P, Nellen L, Nelles A, Neuser J, Nhung PT, Niemietz L, Nierstenhoefer N, Nitz D, Nosek D, Nožka L, Nyklicek M, Oehlschläger J, Olinto A, Olmos-Gilbaja VM, Ortiz M, Pacheco N, Pakk Selmi-Dei D, Palatka M, Pallotta J, Palmieri N, Parente G, Parizot E, Parra A, Parsons RD, Pastor S, Paul T, Pech M, Pekala J, Pelayo R, Pepe IM, Perrone L, Pesce R, Petermann E, Petrera S, Petrinca P, Petrolini A, Petrov Y, Petrovic J, Pfendner C, Phan N, Piegaia R, Pierog T, Pieroni P, Pimenta M, Pirronello V, Platino M, Ponce VH, Pontz M, Privitera P, Prouza M, Quel EJ, Querchfeld S, Rautenberg J, Ravel O, Ravignani D, Revenu B, Ridky J, Riggi S, Risse M, Ristori P, Rivera H, Rizi V, Roberts J, Robledo C, Rodrigues de Carvalho W, Rodriguez G, Rodriguez Martino J, Rodriguez Rojo J, Rodriguez-Cabo I, Rodríguez-Frías MD, Ros G, Rosado J, Rossler T, Roth M, Rouillé-d'Orfeuil B, Roulet E, Rovero AC, Rühle C, Salamida F, Salazar H, Salesa Greus F, Salina G, Sánchez F, Santo CE, Santos E, Santos EM, Sarazin F, Sarkar B, Sarkar S, Sato R, Scharf N, Scherini V, Schieler H, Schiffer P, Schmidt A, Scholten O, Schoorlemmer H, Schovancova J, Schovánek P, Schröder F, Schulte S, Schuster D, Sciutto SJ, Scuderi M, Segreto A, Settimo M, Shadkam A, Shellard RC, Sidelnik I, Sigl G, Silva Lopez HH, Smiałkowski A, Smída R, Snow GR, Sommers P, Sorokin J, Spinka H, Squartini R, Stanic S, Stapleton J, Stasielak J, Stephan M, Stutz A, Suarez F, Suomijärvi T, Supanitsky AD, Suša T, Sutherland MS, Swain J, Szadkowski Z, Szuba M, Tamashiro A, Tapia A, Tartare M, Taşcău O, Tavera Ruiz CG, Tcaciuc R, Tegolo D, Thao NT, Thomas D, Tiffenberg J, Timmermans C, Tiwari DK, Tkaczyk W, Todero Peixoto CJ, Tomé B, Tonachini A, Travnicek P, Tridapalli DB, Tristram G, Trovato E, Tueros M, Ulrich R, Unger M, Urban M, Valdés Galicia JF, Valiño I, Valore L, van den Berg AM, Varela E, Vargas Cárdenas B, Vázquez JR, Vázquez RA, Veberič D, Verzi V, Vicha J, Videla M, Villaseñor L, Wahlberg H, Wahrlich P, Wainberg O, Walz D, Warner D, Watson AA, Weber M, Weidenhaupt K, Weindl A, Westerhoff S, Whelan BJ, Wieczorek G, Wiencke L, Wilczyńska B, Wilczyński H, Will M, Williams C, Winchen T, Winnick MG, Wommer M, Wundheiler B, Yamamoto T, Yapici T, Younk P, Yuan G, Yushkov A, Zamorano B, Zas E, Zavrtanik D, Zavrtanik M, Zaw I, Zepeda A, Zhu Y, Zimbres Silva M, Ziolkowski M. Measurement of the proton-air cross section at √s=57 TeV with the Pierre Auger Observatory. Phys Rev Lett 2012; 109:062002. [PMID: 23006259 DOI: 10.1103/physrevlett.109.062002] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2011] [Indexed: 06/01/2023]
Abstract
We report a measurement of the proton-air cross section for particle production at the center-of-mass energy per nucleon of 57 TeV. This is derived from the distribution of the depths of shower maxima observed with the Pierre Auger Observatory: systematic uncertainties are studied in detail. Analyzing the tail of the distribution of the shower maxima, a proton-air cross section of [505±22(stat)(-36)(+28)(syst)] mb is found.
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Affiliation(s)
- P Abreu
- LIP and Instituto Superior Técnico, Technical University of Lisbon, Lisbon, Portugal
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9
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Morse K, Norimine J, Hope JC, Brown WC. Breadth of the CD4+ T cell response to Anaplasma marginale VirB9-1, VirB9-2 and VirB10 and MHC class II DR and DQ restriction elements. Immunogenetics 2012; 64:507-23. [PMID: 22361828 DOI: 10.1007/s00251-012-0606-4] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2011] [Accepted: 02/04/2012] [Indexed: 01/11/2023]
Abstract
MHC class II molecules influence antigen-specific CD4+ T lymphocyte responses primed by immunization and infection. CD4+ T cell responses are important for controlling infection by many bacterial pathogens including Anaplasma marginale and are observed in cattle immunized with the protective A. marginale outer membrane (OM) vaccine. Immunogenic proteins that comprise the protective OM vaccine include type IV secretion system (T4SS) proteins VirB9-1, VirB9-2 and VirB10, candidates for inclusion in a multiepitope vaccine. Our goal was to determine the breadth of the VirB9-1, VirB9-2 and VirB10 T cell response and MHC class II restriction elements in six cattle with different MHC class II haplotypes defined by DRB3, DQA and DQB allele combinations for each animal. Overlapping peptides spanning each T4SS protein were tested in T cell proliferation assays with autologous antigen-presenting cells (APC) and artificial APC expressing combinations of bovine DR and DQ molecules. Twenty immunostimulatory peptides were identified; three representing two or more epitopes in VirB9-1, ten representing eight or more epitopes in VirB9-2 and seven representing seven or more epitopes in VirB10. Of the eight DRA/DRB3 molecules, four presented 15 peptides, which was biased as DRA/DRB3*1201 presented ten and DRA/DRB3*1101 presented four peptides. Four DQA/DQB molecules composed of two intrahaplotype and two interhaplotype pairs presented seven peptides, of which five were uniquely presented by DQ molecules. In addition, three functional mixed isotype (DQA/DRB3) restriction elements were identified. The immunogenicity and broad MHC class II presentation of multiple VirB9-1, VirB9-2 and VirB10 peptide epitopes justify their testing as a multiepitope vaccine against A. marginale.
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Affiliation(s)
- Kaitlyn Morse
- Program in Vector-Borne Diseases, Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164-7040, USA
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10
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Abstract
The capacity to identify immunogens for vaccine development by genome-wide screening has been markedly enhanced by the availability of microbial genome sequences coupled to proteomic and bioinformatic analysis. Critical to this approach is in vivo testing in the context of a natural host–pathogen relationship, one that includes genetic diversity in the host as well as among pathogen strains. We aggregate the results of three independent genome-wide screens using in vivo immunization and protection against Anaplasma marginale as a model for discovery of vaccine antigens for rickettsial pathogens. In silico analysis identified 62 outer membrane proteins (Omp) from the 949 predicted proteins in the A. marginale genome. These 62 Omps were reduced to 10 vaccine candidates by two independent genome-wide screens using IgG2 from vaccinates protected from challenge following vaccination with outer membranes (screen 1) or bacterial surface complexes (screen 2). Omps with broadly conserved epitopes were identified by immunization with a live heterologous vaccine, A. marginale ssp. centrale (screen 3), reducing the candidates to three. The genome-wide screens identified Omps that have orthologs broadly conserved among rickettsial pathogens, highlighted the importance of identifying immunologically subdominant antigens, and supported the use of reverse vaccinology approaches in vaccine development for rickettsial diseases.
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Affiliation(s)
- Guy H Palmer
- Program in Vector-borne Diseases, Department of Veterinary Microbiology and Pathology and The Paul G. Allen School for Global Animal Health, Washington State University, Pullman, WA 99164-7040, USA.
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11
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Njongmeta LM, Bray J, Davies CJ, Davis WC, Howard CJ, Hope JC, Palmer GH, Brown WC, Mwangi W. CD205 antigen targeting combined with dendritic cell recruitment factors and antigen-linked CD40L activation primes and expands significant antigen-specific antibody and CD4+ T cell responses following DNA vaccination of outbred animals. Vaccine 2012; 30:1624-35. [DOI: 10.1016/j.vaccine.2011.12.110] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2011] [Revised: 12/13/2011] [Accepted: 12/22/2011] [Indexed: 01/16/2023]
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12
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Brown WC. Adaptive immunity to Anaplasma pathogens and immune dysregulation: implications for bacterial persistence. Comp Immunol Microbiol Infect Dis 2012; 35:241-52. [PMID: 22226382 DOI: 10.1016/j.cimid.2011.12.002] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2011] [Revised: 11/30/2011] [Accepted: 12/06/2011] [Indexed: 12/15/2022]
Abstract
Anaplasma marginale is an obligate intraerythrocytic bacterium that infects ruminants, and notably causes severe economic losses in cattle worldwide. Anaplasma phagocytophilum infects neutrophils and causes disease in many mammals, including ruminants, dogs, cats, horses, and humans. Both bacteria cause persistent infection - infected cattle never clear A. marginale and A. phagocytophilum can also cause persistent infection in ruminants and other animals for several years. This review describes correlates of the protective immune response to these two pathogens as well as subversion and dysregulation of the immune response following infection that likely contribute to long-term persistence. I also compare the immune dysfunction observed with intraerythrocytic A. marginale to that observed in other models of chronic infection resulting in high antigen loads, including malaria, a disease caused by another intraerythrocytic pathogen.
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Affiliation(s)
- Wendy C Brown
- Program in Vector-borne Diseases, Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164-7040, United States.
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13
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Lockwood S, Voth DE, Brayton KA, Beare PA, Brown WC, Heinzen RA, Broschat SL. Identification of Anaplasma marginale type IV secretion system effector proteins. PLoS One 2011; 6:e27724. [PMID: 22140462 PMCID: PMC3225360 DOI: 10.1371/journal.pone.0027724] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2011] [Accepted: 10/23/2011] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Anaplasma marginale, an obligate intracellular alphaproteobacterium in the order Rickettsiales, is a tick-borne pathogen and the leading cause of anaplasmosis in cattle worldwide. Complete genome sequencing of A. marginale revealed that it has a type IV secretion system (T4SS). The T4SS is one of seven known types of secretion systems utilized by bacteria, with the type III and IV secretion systems particularly prevalent among pathogenic Gram-negative bacteria. The T4SS is predicted to play an important role in the invasion and pathogenesis of A. marginale by translocating effector proteins across its membrane into eukaryotic target cells. However, T4SS effector proteins have not been identified and tested in the laboratory until now. RESULTS By combining computational methods with phylogenetic analysis and sequence identity searches, we identified a subset of potential T4SS effectors in A. marginale strain St. Maries and chose six for laboratory testing. Four (AM185, AM470, AM705 [AnkA], and AM1141) of these six proteins were translocated in a T4SS-dependent manner using Legionella pneumophila as a reporter system. CONCLUSIONS The algorithm employed to find T4SS effector proteins in A. marginale identified four such proteins that were verified by laboratory testing. L. pneumophila was shown to work as a model system for A. marginale and thus can be used as a screening tool for A. marginale effector proteins. The first T4SS effector proteins for A. marginale have been identified in this work.
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Affiliation(s)
- Svetlana Lockwood
- School of Electrical Engineering and Computer Science, Washington State University, Pullman, Washington, United States of America
| | - Daniel E. Voth
- Department of Microbiology and Immunology, University of Arkansas for Medical Sciences, Little Rock, Arkansas, United States of America
| | - Kelly A. Brayton
- Department of Veterinary Microbiology and Pathology and Paul G. Allen School for Global Animal Health, Washington State University, Pullman, Washington, United States of America
| | - Paul A. Beare
- Coxiella Pathogenesis Section, Laboratory of Intracellular Parasites, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana, United States of America
| | - Wendy C. Brown
- Department of Veterinary Microbiology and Pathology and Paul G. Allen School for Global Animal Health, Washington State University, Pullman, Washington, United States of America
| | - Robert A. Heinzen
- Coxiella Pathogenesis Section, Laboratory of Intracellular Parasites, Rocky Mountain Laboratories, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Hamilton, Montana, United States of America
| | - Shira L. Broschat
- School of Electrical Engineering and Computer Science, Washington State University, Pullman, Washington, United States of America
- Department of Veterinary Microbiology and Pathology and Paul G. Allen School for Global Animal Health, Washington State University, Pullman, Washington, United States of America
- * E-mail:
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14
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Mwangi DM, Honda Y, Graham SP, Pelle R, Taracha ELN, Gachanja J, Nyanjui JK, Bray J, Palmer GH, Brown WC, Mwangi W. Treatment of cattle with DNA-encoded Flt3L and GM-CSF prior to immunization with Theileria parva candidate vaccine antigens induces CD4 and CD8 T cell IFN-γ responses but not CTL responses. Vet Immunol Immunopathol 2011; 140:244-51. [PMID: 21288576 DOI: 10.1016/j.vetimm.2010.12.013] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2010] [Revised: 12/23/2010] [Accepted: 12/29/2010] [Indexed: 01/17/2023]
Abstract
Theileria parva antigens recognized by cytotoxic T lymphocytes (CTLs) are prime vaccine candidates against East Coast fever in cattle. A strategy for enhancing induction of parasite-specific T cell responses by increasing recruitment and activation of dendritic cells (DCs) at the immunization site by administration of bovine Flt3L and GM-CSF prior to inoculation with DNA vaccine constructs and MVA boost was evaluated. Analysis of immune responses showed induction of significant T. parva-specific proliferation, and IFN-γ-secreting CD4(+) and CD8(+) T cell responses in immunized cattle. However, antigen-specific CTLs were not detected. Following lethal challenge, 5/12 immunized cattle survived by day 21, whereas all the negative controls had to be euthanized due to severe disease, indicating a protective effect of the vaccine (p<0.05). The study demonstrated the potential of this technology to elicit significant MHC class II and class I restricted IFN-γ-secreting CD4(+) and CD8(+) T cells to defined vaccine candidate antigens in a natural host, but also underscores the need to improve strategies for eliciting protective CTL responses.
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Affiliation(s)
- Duncan M Mwangi
- International Livestock Research Institute, P. O. Box 30709, Nairobi 00100, Kenya
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15
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Silva MG, Ueti MW, Norimine J, Florin-Christensen M, Bastos RG, Goff WL, Brown WC, Oliva A, Suarez CE. Babesia bovis expresses Bbo-6cys-E, a member of a novel gene family that is homologous to the 6-cys family of Plasmodium. Parasitol Int 2011; 60:13-8. [DOI: 10.1016/j.parint.2010.09.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2010] [Revised: 08/30/2010] [Accepted: 09/19/2010] [Indexed: 01/31/2023]
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16
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Deringer JR, Chen C, Samuel JE, Brown WC. Immunoreactive Coxiella burnetii Nine Mile proteins separated by 2D electrophoresis and identified by tandem mass spectrometry. Microbiology (Reading) 2010; 157:526-542. [PMID: 21030434 PMCID: PMC3090129 DOI: 10.1099/mic.0.043513-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Coxiella burnetii is a Gram-negative obligate intracellular pathogen and the causative agent of Q fever in humans. Q fever causes acute flu-like symptoms and may develop into a chronic disease leading to endocarditis. Its potential as a bioweapon has led to its classification as a category B select agent. An effective inactivated whole-cell vaccine (WCV) currently exists but causes severe granulomatous/necrotizing reactions in individuals with prior exposure, and is not licensed for use in most countries. Current efforts to reduce or eliminate the deleterious reactions associated with WCVs have focused on identifying potential subunit vaccine candidates. Both humoral and T cell-mediated responses are required for protection in animal models. In this study, nine novel immunogenic C. burnetii proteins were identified in extracted whole-cell lysates using 2D electrophoresis, immunoblotting with immune guinea pig sera, and tandem MS. The immunogenic C. burnetii proteins elicited antigen-specific IgG in guinea pigs vaccinated with whole-cell killed Nine Mile phase I vaccine, suggesting a T cell-dependent response. Eleven additional proteins previously shown to react with immune human sera were also antigenic in guinea pigs, showing the relevance of the guinea pig immunization model for antigen discovery. The antigens described here warrant further investigation to validate their potential use as subunit vaccine candidates.
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Affiliation(s)
- James R Deringer
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164, USA
| | - Chen Chen
- Department of Microbial and Molecular Pathogenesis, Texas A&M Health Science Center, College Station, TX 77843, USA
| | - James E Samuel
- Department of Microbial and Molecular Pathogenesis, Texas A&M Health Science Center, College Station, TX 77843, USA
| | - Wendy C Brown
- School for Global Animal Health, Washington State University, Pullman, WA 99164, USA.,Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164, USA
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17
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Subramaniam R, Dassanayake RP, Norimine J, Brown WC, Knowles DP, Srikumaran S. Molecular cloning, characterization and in vitro expression of SERPIN B1 of bighorn sheep (Ovis canadensis) and domestic sheep (Ovis aries), and comparison with that of other species. Vet Immunol Immunopathol 2010; 137:327-31. [DOI: 10.1016/j.vetimm.2010.05.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2010] [Revised: 03/23/2010] [Accepted: 05/28/2010] [Indexed: 11/28/2022]
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18
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Goff WL, Bastos RG, Brown WC, Johnson WC, Schneider DA. The bovine spleen: interactions among splenic cell populations in the innate immunologic control of hemoparasitic infections. Vet Immunol Immunopathol 2010; 138:1-14. [PMID: 20692048 DOI: 10.1016/j.vetimm.2010.07.006] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2010] [Revised: 07/08/2010] [Accepted: 07/12/2010] [Indexed: 11/17/2022]
Abstract
Over the past several years, innate immunity has been recognized as having an important role as a front-line defense mechanism and as an integral part of the adaptive immune response. Innate immunity in cattle exposed to hemoparasites is spleen-dependent and age-related. In this review, we discuss general aspects of innate immunity and the cells involved in this aspect of the response to infection. We also provide examples of specific splenic regulatory and effector mechanisms involved in the response to Babesia bovis, an important tick-borne hemoparasitic disease of cattle. Evidence for the regulatory and effector role of bovine splenic monocytes and DC both in directing a type-1 response through interaction with splenic NK cells and γδT-cells will be presented.
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Affiliation(s)
- W L Goff
- Animal Disease Research Unit, USDA-ARS, 3003 ADBF/WSU, Pullman, WA 99164-6630, USA
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19
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Silva MG, Ueti MW, Norimine J, Florin-Christensen M, Bastos RG, Goff WL, Brown WC, Oliva A, Suarez CE. Babesia bovis expresses a neutralization-sensitive antigen that contains a microneme adhesive repeat (MAR) domain. Parasitol Int 2010; 59:294-7. [PMID: 20304092 DOI: 10.1016/j.parint.2010.03.004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2010] [Revised: 03/10/2010] [Accepted: 03/14/2010] [Indexed: 10/19/2022]
Abstract
A gene coding for a protein with sequence similarity to the Toxoplasma gondii micronemal 1 (MIC1) protein that contains a copy of a domain described as a sialic acid-binding micronemal adhesive repeat (MAR) was identified in the Babesia bovis genome. The single copy gene, located in chromosome 3, contains an open reading frame encoding a putative 181 amino acid protein, which is highly conserved among distinct B. bovis strains. Antibodies against both recombinant protein and synthetic peptides mimicking putative antigenic regions in the B. bovis-MIC1 (Bbo-MIC1) protein bind to the parasite in immunofluorescence assays and significantly inhibit erythrocyte invasion in in vitro B. bovis cultures. Bbo-MIC1 is recognized by antibodies in serum from B. bovis infected cattle, demonstrating expression and immunogenicity during infection. Overall, the results suggest that Bbo-MIC1 protein is a viable candidate for development of subunit vaccines.
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Affiliation(s)
- Marta G Silva
- Biomolecular Diagnostic Laboratory, ITQB/IBET, Universidade Nova de Lisboa, Av. da Republica, Apt 12, Oeiras, Portugal.
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20
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Abraham J, Abreu P, Aglietta M, Ahn EJ, Allard D, Allekotte I, Allen J, Alvarez-Muñiz J, Ambrosio M, Anchordoqui L, Andringa S, Anticić T, Anzalone A, Aramo C, Arganda E, Arisaka K, Arqueros F, Asorey H, Assis P, Aublin J, Ave M, Avila G, Bäcker T, Badagnani D, Balzer M, Barber KB, Barbosa AF, Barroso SLC, Baughman B, Bauleo P, Beatty JJ, Becker BR, Becker KH, Bellétoile A, Bellido JA, Benzvi S, Berat C, Bergmann T, Bertou X, Biermann PL, Billoir P, Blanch-Bigas O, Blanco F, Blanco M, Bleve C, Blümer H, Bohácová M, Boncioli D, Bonifazi C, Bonino R, Borodai N, Brack J, Brogueira P, Brown WC, Bruijn R, Buchholz P, Bueno A, Burton RE, Busca NG, Caballero-Mora KS, Caramete L, Caruso R, Castellina A, Catalano O, Cataldi G, Cazon L, Cester R, Chauvin J, Chiavassa A, Chinellato JA, Chou A, Chudoba J, Clay RW, Colombo E, Coluccia MR, Conceição R, Contreras F, Cook H, Cooper MJ, Coppens J, Cordier A, Cotti U, Coutu S, Covault CE, Creusot A, Criss A, Cronin J, Curutiu A, Dagoret-Campagne S, Dallier R, Daumiller K, Dawson BR, de Almeida RM, De Domenico M, De Donato C, de Jong SJ, De La Vega G, de Mello Junior WJM, de Mello Neto JRT, De Mitri I, de Souza V, de Vries KD, Decerprit G, Del Peral L, Deligny O, Della Selva A, Delle Fratte C, Dembinski H, Di Giulio C, Diaz JC, Díaz Castro ML, Diep PN, Dobrigkeit C, D'Olivo JC, Dong PN, Dorofeev A, Dos Anjos JC, Dova MT, D'Urso D, Dutan I, Duvernois MA, Ebr J, Engel R, Erdmann M, Escobar CO, Etchegoyen A, Facal San Luis P, Falcke H, Farrar G, Fauth AC, Fazzini N, Ferrero A, Fick B, Filevich A, Filipcic A, Fleck I, Fliescher S, Fracchiolla CE, Fraenkel ED, Fröhlich U, Fulgione W, Gamarra RF, Gambetta S, García B, García Gámez D, Garcia-Pinto D, Garrido X, Gelmini G, Gemmeke H, Ghia PL, Giaccari U, Giller M, Glass H, Goggin LM, Gold MS, Golup G, Gomez Albarracin F, Gómez Berisso M, Gonçalves P, Gonzalez D, Gonzalez JG, Góra D, Gorgi A, Gouffon P, Gozzini SR, Grashorn E, Grebe S, Grigat M, Grillo AF, Guardincerri Y, Guarino F, Guedes GP, Hague JD, Halenka V, Hansen P, Harari D, Harmsma S, Harton JL, Haungs A, Hebbeker T, Heck D, Herve AE, Hojvat C, Holmes VC, Homola P, Hörandel JR, Horneffer A, Hrabovský M, Huege T, Hussain M, Iarlori M, Insolia A, Ionita F, Italiano A, Jiraskova S, Kadija K, Kaducak M, Kampert KH, Karova T, Kasper P, Kégl B, Keilhauer B, Keivani A, Kelley J, Kemp E, Kieckhafer RM, Klages HO, Kleifges M, Kleinfeller J, Knapik R, Knapp J, Koang DH, Krieger A, Krömer O, Kruppke-Hansen D, Kuehn F, Kuempel D, Kulbartz K, Kunka N, Kusenko A, La Rosa G, Lachaud C, Lago BL, Lautridou P, Leão MSAB, Lebrun D, Lebrun P, Lee J, Leigui de Oliveira MA, Lemiere A, Letessier-Selvon A, Lhenry-Yvon I, López R, Lopez Agüera A, Louedec K, Lozano Bahilo J, Lucero A, Ludwig M, Lyberis H, Maccarone MC, Macolino C, Maldera S, Mandat D, Mantsch P, Mariazzi AG, Marin V, Maris IC, Marquez Falcon HR, Marsella G, Martello D, Martínez Bravo O, Mathes HJ, Matthews J, Matthews JAJ, Matthiae G, Maurizio D, Mazur PO, McEwen M, Medina-Tanco G, Melissas M, Melo D, Menichetti E, Menshikov A, Meurer C, Micanović S, Micheletti MI, Miller W, Miramonti L, Mollerach S, Monasor M, Monnier Ragaigne D, Montanet F, Morales B, Morello C, Moreno E, Moreno JC, Morris C, Mostafá M, Mueller S, Muller MA, Mussa R, Navarra G, Navarro JL, Navas S, Necesal P, Nellen L, Nhung PT, Nierstenhoefer N, Nitz D, Nosek D, Nozka L, Nyklicek M, Oehlschläger J, Olinto A, Oliva P, Olmos-Gilbaja VM, Ortiz M, Pacheco N, Pakk Selmi-Dei D, Palatka M, Pallotta J, Palmieri N, Parente G, Parizot E, Parlati S, Parra A, Parrisius J, Parsons RD, Pastor S, Paul T, Pavlidou V, Payet K, Pech M, Pekala J, Pelayo R, Pepe IM, Perrone L, Pesce R, Petermann E, Petrera S, Petrinca P, Petrolini A, Petrov Y, Petrovic J, Pfendner C, Piegaia R, Pierog T, Pimenta M, Pirronello V, Platino M, Ponce VH, Pontz M, Privitera P, Prouza M, Quel EJ, Rautenberg J, Ravel O, Ravignani D, Redondo A, Revenu B, Rezende FAS, Ridky J, Riggi S, Risse M, Ristori P, Rivière C, Rizi V, Robledo C, Rodriguez G, Rodriguez Martino J, Rodriguez Rojo J, Rodriguez-Cabo I, Rodríguez-Frías MD, Ros G, Rosado J, Rossler T, Roth M, Rouillé-d'Orfeuil B, Roulet E, Rovero AC, Salamida F, Salazar H, Salina G, Sánchez F, Santander M, Santo CE, Santos E, Santos EM, Sarazin F, Sarkar S, Sato R, Scharf N, Scherini V, Schieler H, Schiffer P, Schmidt A, Schmidt F, Schmidt T, Scholten O, Schoorlemmer H, Schovancova J, Schovánek P, Schroeder F, Schulte S, Schüssler F, Schuster D, Sciutto SJ, Scuderi M, Segreto A, Semikoz D, Settimo M, Shadkam A, Shellard RC, Sidelnik I, Siffert BB, Sigl G, Smiałkowski A, Smída R, Snow GR, Sommers P, Sorokin J, Spinka H, Squartini R, Stasielak J, Stephan M, Strazzeri E, Stutz A, Suarez F, Suomijärvi T, Supanitsky AD, Susa T, Sutherland MS, Swain J, Szadkowski Z, Tamashiro A, Tamburro A, Tapia A, Tarutina T, Taşcău O, Tcaciuc R, Tcherniakhovski D, Tegolo D, Thao NT, Thomas D, Tiffenberg J, Timmermans C, Tkaczyk W, Todero Peixoto CJ, Tomé B, Tonachini A, Travnicek P, Tridapalli DB, Tristram G, Trovato E, Tueros M, Ulrich R, Unger M, Urban M, Valdés Galicia JF, Valiño I, Valore L, van den Berg AM, Vázquez JR, Vázquez RA, Veberic D, Venters T, Verzi V, Videla M, Villaseñor L, Vorobiov S, Voyvodic L, Wahlberg H, Wahrlich P, Wainberg O, Warner D, Watson AA, Westerhoff S, Whelan BJ, Wieczorek G, Wiencke L, Wilczyńska B, Wilczyński H, Williams C, Winchen T, Winnick MG, Wundheiler B, Yamamoto T, Younk P, Yuan G, Yushkov A, Zas E, Zavrtanik D, Zavrtanik M, Zaw I, Zepeda A, Ziolkowski M. Measurement of the depth of maximum of extensive air showers above 10{18} eV. Phys Rev Lett 2010; 104:091101. [PMID: 20366976 DOI: 10.1103/physrevlett.104.091101] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2009] [Indexed: 05/29/2023]
Abstract
We describe the measurement of the depth of maximum, X{max}, of the longitudinal development of air showers induced by cosmic rays. Almost 4000 events above 10;{18} eV observed by the fluorescence detector of the Pierre Auger Observatory in coincidence with at least one surface detector station are selected for the analysis. The average shower maximum was found to evolve with energy at a rate of (106{-21}{+35}) g/cm{2}/decade below 10{18.24+/-0.05} eV, and (24+/-3) g/cm{2}/decade above this energy. The measured shower-to-shower fluctuations decrease from about 55 to 26 g/cm{2}. The interpretation of these results in terms of the cosmic ray mass composition is briefly discussed.
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Affiliation(s)
- J Abraham
- National Technological University, Faculty Mendoza (CONICET/CNEA), Mendoza, Argentina
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Shanthalingam S, Norimine J, Brown WC, Srikumaran S. Molecular cloning of CD18 of bison, deer and elk, and comparison with that of other ruminants and non-ruminants. Vet Immunol Immunopathol 2010; 136:163-9. [PMID: 20176404 DOI: 10.1016/j.vetimm.2010.01.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2009] [Revised: 01/20/2010] [Accepted: 01/21/2010] [Indexed: 10/19/2022]
Abstract
Pneumonia caused by Mannheimia haemolytica is an important disease of cattle, domestic sheep, bighorn sheep and goats. Leukotoxin (Lkt) produced by M. haemolytica is cytolytic to all leukocyte subsets of these species. Lkt utilizes CD18, the beta subunit of beta(2)-integrins, as its functional receptor on leukocytes of these species. Cytotoxicity assays revealed that leukocytes from bison, deer, and elk are also susceptible to Lkt-induced cytolysis. The availability of cDNA encoding CD18 of bison, deer and elk would facilitate the comparison of a greater number of ruminant CD18 cDNA with that of non-ruminants as a means of the elucidation of the molecular basis for the specificity of M. haemolytica Lkt for ruminant leukocytes. Herein, we report the cloning and characterization of bison, deer, and elk CD18. The full-length cDNA of bison and deer consists of 2310bp with an ORF encoding 769 amino acids while elk CD18 consists of 2313bp with an ORF encoding 770 amino acids. This gene is highly conserved among ruminants compared with non-ruminants. Phylogenetic analysis based on amino acid sequences showed that CD18 of bison is most closely related to that of cattle while CD18 of deer and elk are more closely related to each other.
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Affiliation(s)
- Sudarvili Shanthalingam
- Department of Veterinary Microbiology and Pathology, College of Veterinary Medicine, Washington State University, Pullman, WA 99164-7040, USA
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Elsik CG, Tellam RL, Worley KC, Gibbs RA, Muzny DM, Weinstock GM, Adelson DL, Eichler EE, Elnitski L, Guigó R, Hamernik DL, Kappes SM, Lewin HA, Lynn DJ, Nicholas FW, Reymond A, Rijnkels M, Skow LC, Zdobnov EM, Schook L, Womack J, Alioto T, Antonarakis SE, Astashyn A, Chapple CE, Chen HC, Chrast J, Câmara F, Ermolaeva O, Henrichsen CN, Hlavina W, Kapustin Y, Kiryutin B, Kitts P, Kokocinski F, Landrum M, Maglott D, Pruitt K, Sapojnikov V, Searle SM, Solovyev V, Souvorov A, Ucla C, Wyss C, Anzola JM, Gerlach D, Elhaik E, Graur D, Reese JT, Edgar RC, McEwan JC, Payne GM, Raison JM, Junier T, Kriventseva EV, Eyras E, Plass M, Donthu R, Larkin DM, Reecy J, Yang MQ, Chen L, Cheng Z, Chitko-McKown CG, Liu GE, Matukumalli LK, Song J, Zhu B, Bradley DG, Brinkman FSL, Lau LPL, Whiteside MD, Walker A, Wheeler TT, Casey T, German JB, Lemay DG, Maqbool NJ, Molenaar AJ, Seo S, Stothard P, Baldwin CL, Baxter R, Brinkmeyer-Langford CL, Brown WC, Childers CP, Connelley T, Ellis SA, Fritz K, Glass EJ, Herzig CTA, Iivanainen A, Lahmers KK, Bennett AK, Dickens CM, Gilbert JGR, Hagen DE, Salih H, Aerts J, Caetano AR, Dalrymple B, Garcia JF, Gill CA, Hiendleder SG, Memili E, Spurlock D, Williams JL, Alexander L, Brownstein MJ, Guan L, Holt RA, Jones SJM, Marra MA, Moore R, Moore SS, Roberts A, Taniguchi M, Waterman RC, Chacko J, Chandrabose MM, Cree A, Dao MD, Dinh HH, Gabisi RA, Hines S, Hume J, Jhangiani SN, Joshi V, Kovar CL, Lewis LR, Liu YS, Lopez J, Morgan MB, Nguyen NB, Okwuonu GO, Ruiz SJ, Santibanez J, Wright RA, Buhay C, Ding Y, Dugan-Rocha S, Herdandez J, Holder M, Sabo A, Egan A, Goodell J, Wilczek-Boney K, Fowler GR, Hitchens ME, Lozado RJ, Moen C, Steffen D, Warren JT, Zhang J, Chiu R, Schein JE, Durbin KJ, Havlak P, Jiang H, Liu Y, Qin X, Ren Y, Shen Y, Song H, Bell SN, Davis C, Johnson AJ, Lee S, Nazareth LV, Patel BM, Pu LL, Vattathil S, Williams RL, Curry S, Hamilton C, Sodergren E, Wheeler DA, Barris W, Bennett GL, Eggen A, Green RD, Harhay GP, Hobbs M, Jann O, Keele JW, Kent MP, Lien S, McKay SD, McWilliam S, Ratnakumar A, Schnabel RD, Smith T, Snelling WM, Sonstegard TS, Stone RT, Sugimoto Y, Takasuga A, Taylor JF, Van Tassell CP, Macneil MD, Abatepaulo ARR, Abbey CA, Ahola V, Almeida IG, Amadio AF, Anatriello E, Bahadue SM, Biase FH, Boldt CR, Carroll JA, Carvalho WA, Cervelatti EP, Chacko E, Chapin JE, Cheng Y, Choi J, Colley AJ, de Campos TA, De Donato M, Santos IKFDM, de Oliveira CJF, Deobald H, Devinoy E, Donohue KE, Dovc P, Eberlein A, Fitzsimmons CJ, Franzin AM, Garcia GR, Genini S, Gladney CJ, Grant JR, Greaser ML, Green JA, Hadsell DL, Hakimov HA, Halgren R, Harrow JL, Hart EA, Hastings N, Hernandez M, Hu ZL, Ingham A, Iso-Touru T, Jamis C, Jensen K, Kapetis D, Kerr T, Khalil SS, Khatib H, Kolbehdari D, Kumar CG, Kumar D, Leach R, Lee JCM, Li C, Logan KM, Malinverni R, Marques E, Martin WF, Martins NF, Maruyama SR, Mazza R, McLean KL, Medrano JF, Moreno BT, Moré DD, Muntean CT, Nandakumar HP, Nogueira MFG, Olsaker I, Pant SD, Panzitta F, Pastor RCP, Poli MA, Poslusny N, Rachagani S, Ranganathan S, Razpet A, Riggs PK, Rincon G, Rodriguez-Osorio N, Rodriguez-Zas SL, Romero NE, Rosenwald A, Sando L, Schmutz SM, Shen L, Sherman L, Southey BR, Lutzow YS, Sweedler JV, Tammen I, Telugu BPVL, Urbanski JM, Utsunomiya YT, Verschoor CP, Waardenberg AJ, Wang Z, Ward R, Weikard R, Welsh TH, White SN, Wilming LG, Wunderlich KR, Yang J, Zhao FQ. The genome sequence of taurine cattle: a window to ruminant biology and evolution. Science 2009; 324:522-8. [PMID: 19390049 DOI: 10.1126/science.1169588] [Citation(s) in RCA: 806] [Impact Index Per Article: 53.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
To understand the biology and evolution of ruminants, the cattle genome was sequenced to about sevenfold coverage. The cattle genome contains a minimum of 22,000 genes, with a core set of 14,345 orthologs shared among seven mammalian species of which 1217 are absent or undetected in noneutherian (marsupial or monotreme) genomes. Cattle-specific evolutionary breakpoint regions in chromosomes have a higher density of segmental duplications, enrichment of repetitive elements, and species-specific variations in genes associated with lactation and immune responsiveness. Genes involved in metabolism are generally highly conserved, although five metabolic genes are deleted or extensively diverged from their human orthologs. The cattle genome sequence thus provides a resource for understanding mammalian evolution and accelerating livestock genetic improvement for milk and meat production.
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Howard CJ, Morrison WI, Brown WC, Naessens J, Sopp P. Demonstration of two allelic forms of the bovine T cell antigen Bo5 (CD5) and studies of their inheritance. Anim Genet 2009; 20:351-9. [PMID: 2515774 DOI: 10.1111/j.1365-2052.1989.tb00891.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Two monoclonal antibodies (mAbs), CC17 and IL-A67, which are specific for the bovine equivalent of the CD5 antigen, Bo5, were each found to react with the cells of some animals but not others. The cattle tested were all positive for one or both of the mAbs, but the level of expression on cells expressing both determinants was slightly lower than that on cells expressing either of the determinants on their own. Both mAbs precipitated an antigen of 67 kD. However, sequential immunoprecipitation experiments with cells that reacted with both mAbs demonstrated that the determinants are present on two different sets of molecules. These findings suggested that the mAbs recognize two co-dominantly expressed allelic forms of Bo5. This was confirmed in family studies, with groups of full- and half-sibling offspring of sires and dams of defined phenotypes. These experiments also showed that the gene encoding the Bo5 antigen is not linked to the major histocompatibility complex (MHC). The frequencies of the two alleles, which have been designated Bo5.1 and Bo5.2, in the cattle populations tested were 100% and 0%, respectively, in Bos taurus, and 10% and 90%, respectively, in Bos indicus.
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Affiliation(s)
- C J Howard
- AFRC Institute for Animal Health, Compton Laboratory, Newbury, Berkshire, UK
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Chen C, Bouman TJ, Beare PA, Mertens K, Zhang GQ, Russell-Lodrigue KE, Hogaboam JP, Peters B, Felgner PL, Brown WC, Heinzen RA, Hendrix LR, Samuel JE. A systematic approach to evaluate humoral and cellular immune responses to Coxiella burnetii immunoreactive antigens. Clin Microbiol Infect 2009; 15 Suppl 2:156-7. [PMID: 19281461 DOI: 10.1111/j.1469-0691.2008.02206.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Affiliation(s)
- C Chen
- Department of Microbial and Molecular Pathogenesis, Texas A&M Health Science Center, College Station, TX 77843-1114, USA
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Brown WC. Immunoproteomic analysis of the protective outer membrane fraction of Anaplasma marginale. Vet Immunol Immunopathol 2009. [DOI: 10.1016/j.vetimm.2008.10.054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Bastos RG, Johnson C, Brown WC, Goff WL. Interaction of natural killer cells, monocytes and dendritic cell populations in cattle. Vet Immunol Immunopathol 2009. [DOI: 10.1016/j.vetimm.2008.10.226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Vichido R, Falcon A, Ramos JA, Alvarez A, Figueroa JV, Norimine J, Brown WC, Castro LA, Mosqueda J. Expression analysis of heat shock protein 20 and rhoptry-associated protein 1a in sexual stages and kinetes of Babesia bigemina. Ann N Y Acad Sci 2009; 1149:136-40. [PMID: 19120192 DOI: 10.1196/annals.1428.073] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
Heat shock protein 20 (HSP-20) and rhoptry-associated protein 1a (RAP-1a) are two proteins considered as candidates to be included in vaccines or diagnostics methods for the control of bovine babesiosis. It has been hypothesized that both genes have a basic function in the cellular physiology of erythrocyte-infecting stages; it is not known if they have a functional role in tick stages. The objective of this work was to analyze whether hsp-20 and rap-1a are expressed in sexual stages and kinetes of Babesia bigemina. Purified RNA from sexual stages and kinetes was analyzed by reverse transcriptase (RT)-PCR with specific primers for hsp-20 or rap-1a. Expression analysis was carried out using an indirect immunofluorescence test with specific antibodies against HSP-20 and RAP-1a. Results obtained by RT-PCR showed amplicons for hsp-20 and rap-1a in sexual stages and kinetes. Positive signals were also detected when sexual stages and kinetes were analyzed with specific antibodies for HSP-20 and RAP-1a. The results obtained here confirm the hypothesis that the genes hsp-20 and rap-1a from B. bigemina are expressed in sexual stages and kinetes and stress the importance of these proteins in the cellular physiology of tick stages.
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Affiliation(s)
- Rodrigo Vichido
- Centro Nacional de Investigación Disciplinaria en Parasitologia, Veterinaria-Instituto Nacional de Investigaciones Forestales, Agrícolas y Pecuarias, Jiutepec, Morelos, México
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Han S, Norimine J, Palmer GH, Mwangi W, Lahmers KK, Brown WC. Rapid deletion of antigen-specific CD4+ T cells following infection represents a strategy of immune evasion and persistence for Anaplasma marginale. J Immunol 2008; 181:7759-69. [PMID: 19017965 DOI: 10.4049/jimmunol.181.11.7759] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Acquired T cell immunity is central for protection against infection. However, the immunological consequences of exposing memory T cells to high Ag loads during acute and persistent infection with systemic pathogens are poorly understood. We investigated this by using infection with Anaplasma marginale, a ruminant pathogen that replicates to levels of 10(9) bacteria per ml of blood during acute infection and maintains mean bacteremia levels of 10(6) per ml during long-term persistent infection. We established that immunization-induced Ag-specific peripheral blood CD4(+) T cell responses were rapidly and permanently lost following infection. To determine whether these T cells were anergic, sequestered in the spleen, or physically deleted from peripheral blood, CD4(+) T lymphocytes from the peripheral blood specific for the major surface protein (MSP) 1a T cell epitope were enumerated by DRB3*1101 tetramer staining and FACS analysis throughout the course of immunization and challenge. Immunization induced significant epitope-specific T lymphocyte responses that rapidly declined near peak bacteremia to background levels. Concomitantly, the mean frequency of tetramer(+)CD4(+) cells decreased rapidly from 0.025% before challenge to a preimmunization level of 0.0003% of CD4(+) T cells. Low frequencies of tetramer(+)CD4(+) T cells in spleen, liver, and inguinal lymph nodes sampled 9-12 wk postchallenge were consistent with undetectable or unsustainable Ag-specific responses and the lack of T cell sequestration. Thus, infection of cattle with A. marginale leads to the rapid loss of Ag-specific T cells and immunologic memory, which may be a strategy for this pathogen to modulate the immune response and persist.
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Affiliation(s)
- Sushan Han
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164, USA
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Abraham J, Abreu P, Aglietta M, Aguirre C, Allard D, Allekotte I, Allen J, Allison P, Alvarez-Muñiz J, Ambrosio M, Anchordoqui L, Andringa S, Anzalone A, Aramo C, Argirò S, Arisaka K, Armengaud E, Arneodo F, Arqueros F, Asch T, Asorey H, Assis P, Atulugama BS, Aublin J, Ave M, Avila G, Bäcker T, Badagnani D, Barbosa AF, Barnhill D, Barroso SLC, Baughman B, Bauleo P, Beatty JJ, Beau T, Becker BR, Becker KH, Bellido JA, Benzvi S, Berat C, Bergmann T, Bernardini P, Bertou X, Biermann PL, Billoir P, Blanch-Bigas O, Blanco F, Blasi P, Bleve C, Blümer H, Bohácová M, Bonifazi C, Bonino R, Brack J, Brogueira P, Brown WC, Buchholz P, Bueno A, Burton RE, Busca NG, Caballero-Mora KS, Cai B, Camin DV, Caramete L, Caruso R, Carvalho W, Castellina A, Catalano O, Cataldi G, Cazon L, Cester R, Chauvin J, Chiavassa A, Chinellato JA, Chou A, Chudoba J, Chye J, Clark PDJ, Clay RW, Colombo E, Conceição R, Connolly B, Contreras F, Coppens J, Cordier A, Cotti U, Coutu S, Covault CE, Creusot A, Criss A, Cronin J, Curutiu A, Dagoret-Campagne S, Daumiller K, Dawson BR, de Almeida RM, De Donato C, de Jong SJ, De La Vega G, Junior WJMDM, Neto JRTDM, De Mitri I, de Souza V, Del Peral L, Deligny O, Della Selva A, Fratte CD, Dembinski H, Di Giulio C, Diaz JC, Diep PN, Dobrigkeit C, D'Olivo JC, Dong PN, Dornic D, Dorofeev A, Dos Anjos JC, Dova MT, D'Urso D, Dutan I, Duvernois MA, Engel R, Epele L, Erdmann M, Escobar CO, Etchegoyen A, Luis PFS, Falcke H, Farrar G, Fauth AC, Fazzini N, Ferrer F, Ferrero A, Fick B, Filevich A, Filipcic A, Fleck I, Fracchiolla CE, Fulgione W, García B, Gámez DG, Garcia-Pinto D, Garrido X, Geenen H, Gelmini G, Gemmeke H, Ghia PL, Giller M, Glass H, Gold MS, Golup G, Albarracin FG, Berisso MG, Gonçalves P, do Amaral MG, Gonzalez D, Gonzalez JG, González M, Góra D, Gorgi A, Gouffon P, Grassi V, Grillo AF, Grunfeld C, Guardincerri Y, Guarino F, Guedes GP, Gutiérrez J, Hague JD, Halenka V, Hamilton JC, Hansen P, Harari D, Harmsma S, Harton JL, Haungs A, Hauschildt T, Healy MD, Hebbeker T, Hebrero G, Heck D, Hojvat C, Holmes VC, Homola P, Hörandel JR, Horneffer A, Hrabovský M, Huege T, Hussain M, Iarlori M, Insolia A, Ionita F, Italiano A, Kaducak M, Kampert KH, Karova T, Kasper P, Kégl B, Keilhauer B, Kemp E, Kieckhafer RM, Klages HO, Kleifges M, Kleinfeller J, Knapik R, Knapp J, Koang DH, Krieger A, Krömer O, Kuempel D, Kunka N, Kusenko A, La Rosa G, Lachaud C, Lago BL, Lebrun D, Lebrun P, Lee J, de Oliveira MAL, Letessier-Selvon A, Leuthold M, Lhenry-Yvon I, López R, Agüera AL, Bahilo JL, Lucero A, García RL, Maccarone MC, Macolino C, Maldera S, Mancarella G, Manceñido ME, Mandat D, Mantsch P, Mariazzi AG, Maris IC, Falcon HRM, Martello D, Martínez J, Bravo OM, Mathes HJ, Matthews J, Matthews JAJ, Matthiae G, Maurizio D, Mazur PO, McCauley T, McEwen M, McNeil RR, Medina MC, Medina-Tanco G, Melo D, Menichetti E, Menschikov A, Meurer C, Meyhandan R, Micheletti MI, Miele G, Miller W, Mollerach S, Monasor M, Ragaigne DM, Montanet F, Morales B, Morello C, Moreno JC, Morris C, Mostafá M, Muller MA, Mussa R, Navarra G, Navarro JL, Navas S, Necesal P, Nellen L, Newman-Holmes C, Newton D, Nhung PT, Nierstenhoefer N, Nitz D, Nosek D, Nozka L, Oehlschläger J, Ohnuki T, Olinto A, Olmos-Gilbaja VM, Ortiz M, Ortolani F, Ostapchenko S, Otero L, Pacheco N, Selmi-Dei DP, Palatka M, Pallotta J, Parente G, Parizot E, Parlati S, Pastor S, Patel M, Paul T, Pavlidou V, Payet K, Pech M, Pekala J, Pelayo R, Pepe IM, Perrone L, Pesce R, Petrera S, Petrinca P, Petrov Y, Pichel A, Piegaia R, Pierog T, Pimenta M, Pinto T, Pirronello V, Pisanti O, Platino M, Pochon J, Privitera P, Prouza M, Quel EJ, Rautenberg J, Redondo A, Reucroft S, Revenu B, Rezende FAS, Ridky J, Riggi S, Risse M, Rivière C, Rizi V, Roberts M, Robledo C, Rodriguez G, Martino JR, Rojo JR, Rodriguez-Cabo I, Rodríguez-Frías MD, Ros G, Rosado J, Roth M, Rouillé-d'Orfeuil B, Roulet E, Rovero AC, Salamida F, Salazar H, Salina G, Sánchez F, Santander M, Santo CE, Santos EM, Sarazin F, Sarkar S, Sato R, Scherini V, Schieler H, Schmidt A, Schmidt F, Schmidt T, Scholten O, Schovánek P, Schroeder F, Schulte S, Schüssler F, Sciutto SJ, Scuderi M, Segreto A, Semikoz D, Settimo M, Shellard RC, Sidelnik I, Siffert BB, Sigl G, Grande NSD, Smiałkowski A, Smída R, Smith AGK, Smith BE, Snow GR, Sokolsky P, Sommers P, Sorokin J, Spinka H, Squartini R, Strazzeri E, Stutz A, Suarez F, Suomijärvi T, Supanitsky AD, Sutherland MS, Swain J, Szadkowski Z, Takahashi J, Tamashiro A, Tamburro A, Tarutina T, Taşcău O, Tcaciuc R, Thao NT, Thomas D, Ticona R, Tiffenberg J, Timmermans C, Tkaczyk W, Peixoto CJT, Tomé B, Tonachini A, Torres I, Travnicek P, Tripathi A, Tristram G, Tscherniakhovski D, Tuci V, Tueros M, Tunnicliffe V, Ulrich R, Unger M, Urban M, Galicia JFV, Valiño I, Valore L, van den Berg AM, van Elewyck V, Vázquez RA, Veberic D, Veiga A, Velarde A, Venters T, Verzi V, Videla M, Villaseñor L, Vorobiov S, Voyvodic L, Wahlberg H, Wahrlich P, Wainberg O, Walker P, Warner D, Watson AA, Westerhoff S, Wieczorek G, Wiencke L, Wilczyńska B, Wilczyński H, Wileman C, Winnick MG, Wu H, Wundheiler B, Yamamoto T, Younk P, Zas E, Zavrtanik D, Zavrtanik M, Zaw I, Zepeda A, Ziolkowski M. Observation of the suppression of the flux of cosmic rays above 4 x 10 (19) eV. Phys Rev Lett 2008; 101:061101. [PMID: 18764444 DOI: 10.1103/physrevlett.101.061101] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2008] [Indexed: 05/26/2023]
Abstract
The energy spectrum of cosmic rays above 2.5 x 10;{18} eV, derived from 20,000 events recorded at the Pierre Auger Observatory, is described. The spectral index gamma of the particle flux, J proportional, variantE;{-gamma}, at energies between 4 x 10;{18} eV and 4 x 10;{19} eV is 2.69+/-0.02(stat)+/-0.06(syst), steepening to 4.2+/-0.4(stat)+/-0.06(syst) at higher energies. The hypothesis of a single power law is rejected with a significance greater than 6 standard deviations. The data are consistent with the prediction by Greisen and by Zatsepin and Kuz'min.
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Affiliation(s)
- J Abraham
- Universidad Tecnológica Nacional, FR-Mendoza, Argentina
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Abraham J, Abreu P, Aglietta M, Aguirre C, Allard D, Allekotte I, Allen J, Allison P, Alvarez-Muñiz J, Ambrosio M, Anchordoqui L, Andringa S, Anzalone A, Aramo C, Argirò S, Arisaka K, Armengaud E, Arneodo F, Arqueros F, Asch T, Asorey H, Assis P, Atulugama BS, Aublin J, Ave M, Avila G, Bäcker T, Badagnani D, Barbosa AF, Barnhill D, Barroso SLC, Bauleo P, Beatty JJ, Beau T, Becker BR, Becker KH, Bellido JA, BenZvi S, Berat C, Bergmann T, Bernardini P, Bertou X, Biermann PL, Billoir P, Blanch-Bigas O, Blanco F, Blasi P, Bleve C, Blümer H, Bohácová M, Bonifazi C, Bonino R, Boratav M, Brack J, Brogueira P, Brown WC, Buchholz P, Bueno A, Burton RE, Busca NG, Caballero-Mora KS, Cai B, Camin DV, Caramete L, Caruso R, Carvalho W, Castellina A, Catalano O, Cataldi G, Cazon L, Cester R, Chauvin J, Chiavassa A, Chinellato JA, Chou A, Chye J, Clark PDJ, Clay RW, Colombo E, Conceição R, Connolly B, Contreras F, Coppens J, Cordier A, Cotti U, Coutu S, Covault CE, Creusot A, Criss A, Cronin J, Curutiu A, Dagoret-Campagne S, Daumiller K, Dawson BR, de Almeida RM, De Donato C, de Jong SJ, De La Vega G, de Mello Junior WJM, de Mello Neto JRT, DeMitri I, de Souza V, del Peral L, Deligny O, Della Selva A, Delle Fratte C, Dembinski H, Di Giulio C, Diaz JC, Dobrigkeit C, D'Olivo JC, Dornic D, Dorofeev A, dos Anjos JC, Dova MT, D'Urso D, Dutan I, DuVernois MA, Engel R, Epele L, Erdmann M, Escobar CO, Etchegoyen A, Facal San Luis P, Falcke H, Farrar G, Fauth AC, Fazzini N, Ferrer F, Ferry S, Fick B, Filevich A, Filipcic A, Fleck I, Fonte R, Fracchiolla CE, Fulgione W, García B, García Gámez D, Garcia-Pinto D, Garrido X, Geenen H, Gelmini G, Gemmeke H, Ghia PL, Giller M, Glass H, Gold MS, Golup G, Gomez Albarracin F, Gómez Berisso M, Gómez Herrero R, Gonçalves P, Gonçalves do Amaral M, Gonzalez D, Gonzalez JG, González M, Góra D, Gorgi A, Gouffon P, Grassi V, Grillo AF, Grunfeld C, Guardincerri Y, Guarino F, Guedes GP, Gutiérrez J, Hague JD, Hamilton JC, Hansen P, Harari D, Harmsma S, Harton JL, Haungs A, Hauschildt T, Healy MD, Hebbeker T, Hebrero G, Heck D, Hojvat C, Holmes VC, Homola P, Hörandel J, Horneffer A, Horvat M, Hrabovský M, Huege T, Hussain M, Iarlori M, Insolia A, Ionita F, Italiano A, Kaducak M, Kampert KH, Karova T, Kégl B, Keilhauer B, Kemp E, Kieckhafer RM, Klages HO, Kleifges M, Kleinfeller J, Knapik R, Knapp J, Koang DH, Krieger A, Krömer O, Kuempel D, Kunka N, Kusenko A, La Rosa G, Lachaud C, Lago BL, Lebrun D, Lebrun P, Lee J, Leigui de Oliveira MA, Letessier-Selvon A, Leuthold M, Lhenry-Yvon I, López R, Lopez Agüera A, Lozano Bahilo J, Luna García R, Maccarone MC, Macolino C, Maldera S, Mancarella G, Manceñido ME, Mandat D, Mantsch P, Mariazzi AG, Maris IC, Marquez Falcon HR, Martello D, Martínez J, Martínez Bravo O, Mathes HJ, Matthews J, Matthews JAJ, Matthiae G, Maurizio D, Mazur PO, McCauley T, McEwen M, McNeil RR, Medina MC, Medina-Tanco G, Meli A, Melo D, Menichetti E, Menschikov A, Meurer C, Meyhandan R, Micheletti MI, Miele G, Miller W, Mollerach S, Monasor M, Monnier Ragaigne D, Montanet F, Morales B, Morello C, Moreno JC, Morris C, Mostafá M, Muller MA, Mussa R, Navarra G, Navarro JL, Navas S, Necesal P, Nellen L, Newman-Holmes C, Newton D, Nguyen Thi T, Nierstenhoefer N, Nitz D, Nosek D, Nozka L, Oehlschläger J, Ohnuki T, Olinto A, Olmos-Gilbaja VM, Ortiz M, Ortolani F, Ostapchenko S, Otero L, Pacheco N, Pakk Selmi-Dei D, Palatka M, Pallotta J, Parente G, Parizot E, Parlati S, Pastor S, Patel M, Paul T, Pavlidou V, Payet K, Pech M, Pekala J, Pelayo R, Pepe IM, Perrone L, Petrera S, Petrinca P, Petrov Y, Pham Ngoc D, Pham Ngoc D, Pham Thi TN, Pichel A, Piegaia R, Pierog T, Pimenta M, Pinto T, Pirronello V, Pisanti O, Platino M, Pochon J, Privitera P, Prouza M, Quel EJ, Rautenberg J, Redondo A, Reucroft S, Revenu B, Rezende FAS, Ridky J, Riggi S, Risse M, Rivière C, Rizi V, Roberts M, Robledo C, Rodriguez G, Rodríguez Frías D, Rodriguez Martino J, Rodriguez Rojo J, Rodriguez-Cabo I, Ros G, Rosado J, Roth M, Rouillé-d'Orfeuil B, Roulet E, Rovero AC, Salamida F, Salazar H, Salina G, Sánchez F, Santander M, Santo CE, Santos EM, Sarazin F, Sarkar S, Sato R, Scherini V, Schieler H, Schmidt A, Schmidt F, Schmidt T, Scholten O, Schovánek P, Schüssler F, Sciutto SJ, Scuderi M, Segreto A, Semikoz D, Settimo M, Shellard RC, Sidelnik I, Siffert BB, Sigl G, Smetniansky De Grande N, Smiałkowski A, Smída R, Smith AGK, Smith BE, Snow GR, Sokolsky P, Sommers P, Sorokin J, Spinka H, Squartini R, Strazzeri E, Stutz A, Suarez F, Suomijärvi T, Supanitsky AD, Sutherland MS, Swain J, Szadkowski Z, Takahashi J, Tamashiro A, Tamburro A, Taşcău O, Tcaciuc R, Thomas D, Ticona R, Tiffenberg J, Timmermans C, Tkaczyk W, Todero Peixoto CJ, Tomé B, Tonachini A, Torres I, Torresi D, Travnicek P, Tripathi A, Tristram G, Tscherniakhovski D, Tueros M, Tunnicliffe V, Ulrich R, Unger M, Urban M, Valdés Galicia JF, Valiño I, Valore L, van den Berg AM, van Elewyck V, Vázquez RA, Veberic D, Veiga A, Velarde A, Venters T, Verzi V, Videla M, Villaseñor L, Vorobiov S, Voyvodic L, Wahlberg H, Wainberg O, Walker P, Warner D, Watson AA, Westerhoff S, Wieczorek G, Wiencke L, Wilczyńska B, Wilczyński H, Wileman C, Winnick MG, Wu H, Wundheiler B, Yamamoto T, Younk P, Zas E, Zavrtanik D, Zavrtanik M, Zech A, Zepeda A, Ziolkowski M. Upper limit on the diffuse flux of ultrahigh energy tau neutrinos from the Pierre Auger Observatory. Phys Rev Lett 2008; 100:211101. [PMID: 18518595 DOI: 10.1103/physrevlett.100.211101] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/11/2007] [Indexed: 05/26/2023]
Abstract
The surface detector array of the Pierre Auger Observatory is sensitive to Earth-skimming tau neutrinos that interact in Earth's crust. Tau leptons from nu(tau) charged-current interactions can emerge and decay in the atmosphere to produce a nearly horizontal shower with a significant electromagnetic component. The data collected between 1 January 2004 and 31 August 2007 are used to place an upper limit on the diffuse flux of nu(tau) at EeV energies. Assuming an E(nu)(-2) differential energy spectrum the limit set at 90% C.L. is E(nu)(2)dN(nu)(tau)/dE(nu)<1.3 x 10(-7) GeV cm(-2) s(-1) sr(-1) in the energy range 2 x 10(17) eV< E(nu)< 2 x 10(19) eV.
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Affiliation(s)
- J Abraham
- Centro de Investigaciones en Laseres y Aplicaciones, CITEFA and CONICET, Argentina
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Lopez JE, Beare PA, Heinzen RA, Norimine J, Lahmers KK, Palmer GH, Brown WC. High-throughput identification of T-lymphocyte antigens from Anaplasma marginale expressed using in vitro transcription and translation. J Immunol Methods 2008; 332:129-41. [DOI: 10.1016/j.jim.2007.12.018] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2007] [Revised: 12/10/2007] [Accepted: 12/27/2007] [Indexed: 10/22/2022]
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Gay CG, Richie TL, Pastoret PP, Minguez-Tudela I, de Baetselier P, Göbel T, Goddeeris B, Kaiser P, Morrison I, Sánchez-Vizcaíno JM, Anderson K, Baillie LW, Brown WC, Estes DM, Herrera E, Nara PL, Ockenhouse CF, Roth JA, Sztein MB. Advances in immunology and vaccine discovery report of the United States-European Commission workshop. Vaccine 2007; 25:7007-11. [PMID: 17728022 DOI: 10.1016/j.vaccine.2007.06.068] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2007] [Accepted: 06/03/2007] [Indexed: 11/21/2022]
Abstract
As the 21st century unfolds, infectious diseases remain one of the most significant threats to our economy, our food animal production systems, animal welfare, and most importantly, the lives of people worldwide, regardless of their economic standing. The potential use of biological threat agents for terrorism or biowarfare further undermines the security of our society. Arguably, vaccines represent the single most cost-effective, medically delivered strategy for confronting these challenges. The workshop "Advances in Immunology and Vaccine Discovery" was organized to address these challenges, based on the conviction that the interface between immunology and vaccinology offers the best prospects for major breakthroughs in vaccine discovery and development. Six focus areas were identified by workshop organizers: (1) pathogen immune evasion; (2) innate immunity; (3) mucosal immunity; (4) immunogenetics; (5) comparative immunology; and (6) genomics. These areas provided opportunities to elucidate how protective immunity may relate to the disruption of the molecular mechanisms that underlie host-pathogen interactions. A report generated by workshop organizers and participants provides key recommendations and identifies important research gaps, needs, future steps, and potential strategic US-EU collaborations. The report is available on line through ScienceDirect (URL).
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Affiliation(s)
- Cyril G Gay
- Animal Production and Protection, Agriculture Research Service, United States Department of Agriculture, 5601 Sunnyside Avenue, Beltsville, MD 20705, United States
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Zhuang Y, Futse JE, Brown WC, Brayton KA, Palmer GH. Maintenance of antibody to pathogen epitopes generated by segmental gene conversion is highly dynamic during long-term persistent infection. Infect Immun 2007; 75:5185-90. [PMID: 17785476 PMCID: PMC2168278 DOI: 10.1128/iai.00913-07] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Multiple bacterial and protozoal pathogens utilize gene conversion to generate rapid intrahost antigenic variation. Both large- and small-genome pathogens expand the size of the variant pool via a combinatorial process in which oligonucleotide segments from distinct donor loci are recombined in various combinations into expression sites. Although the potential combinatorial diversity generated by this segmental gene conversion mechanism is quite large, the functional variant pool depends on whether immune responses against the recombined segments are generated and maintained, regardless of their specific combinatorial context. This question was addressed by tracking the Anaplasma marginale variant population and corresponding segment-specific immunoglobulin G (IgG) antibody responses during long-term infection. Antibody was induced early in A. marginale infection, predominately against the surface-exposed hypervariable region (HVR) rather than against the invariant conserved flanking domains, and these HVR oligopeptides were most immunogenic at the time of acute bacteremia, when the variant population is derived via recombination from a single donor locus. However antibody to HVR oligopeptides was not consistently maintained during persistent infection, despite reexpression of the same segment, although in a different combinatorial context. This dynamic antibody recognition over time was not attributable to the major histocompatibility complex haplotype of individual animals or use of specific msp2 donor alleles. In contrast, the position and context of an individual oligopeptide segment within the HVR were significant determinants of antibody recognition. The results unify the genetic potential of segmental gene conversion with escape from antibody recognition and identify immunological effects of variant mosaic structure.
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Affiliation(s)
- Yan Zhuang
- Program in Vector-Borne Diseases and Immunology, Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington 99164-7040, USA
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34
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Maue AC, Waters WR, Palmer MV, Nonnecke BJ, Minion FC, Brown WC, Norimine J, Foote MR, Scherer CFC, Estes DM. An ESAT-6:CFP10 DNA vaccine administered in conjunction with Mycobacterium bovis BCG confers protection to cattle challenged with virulent M. bovis. Vaccine 2007; 25:4735-46. [PMID: 17499400 DOI: 10.1016/j.vaccine.2007.03.052] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2007] [Revised: 03/24/2007] [Accepted: 03/30/2007] [Indexed: 12/16/2022]
Abstract
The potency of genetic immunization observed in the mouse has demonstrated the utility of DNA vaccines to induce cell-mediated and humoral immune responses. However, it has been relatively difficult to generate comparable responses in non-rodent species. The use of molecular adjuvants may increase the magnitude of these suboptimal responses. In this study, we demonstrate that the co-administration of plasmid-encoded GM-CSF and CD80/CD86 with a novel ESAT-6:CFP10 DNA vaccine against bovine tuberculosis enhances antigen-specific cell-mediated immune responses. ESAT-6:CFP10+GM-CSF+CD80/CD86 DNA vaccinated animals exhibited significant (p<0.01) antigen-specific proliferative responses compared to other DNA vaccinates. Increased expression (p< or =0.05) of CD25 on PBMC from ESAT-6:CFP10+GM-CSF+CD80/CD86 DNA vaccinates was associated with increased proliferation, as compared to control DNA vaccinates. Significant (p<0.05) numbers of ESAT-6:CFP10-specific IFN-gamma producing cells were evident from all ESAT-6:CFP10 DNA vaccinated animals compared to control DNA vaccinates. However, the greatest increase in IFN-gamma producing cells was from animals vaccinated with ESAT-6:CFP10+GM-CSF+CD80/CD86 DNA. In a low-dose aerosol challenge trial, calves vaccinated as neonates with Mycobacterium bovis BCG and ESAT-6:CFP10+GM-CSF+CD80/CD86 DNA exhibited decreased lesion severity in the lung and lung-associated lymph nodes following viruluent M. bovis challenge compared to other vaccinated animals or non-vaccinated controls. These data suggest that a combined vaccine regimen of M. bovis BCG and a candidate ESAT-6:CFP10 DNA vaccine may offer greater protection against tuberculosis in cattle than vaccination with BCG alone.
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Affiliation(s)
- Alexander C Maue
- Department of Molecular Microbiology and Immunology, University of Missouri, Columbia, MO 65211, USA
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35
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Affiliation(s)
- Wendy C. Brown
- Washington State University, Veterinary Microbiology and Pathology, 402 Bustad Hall, Pullman, WA 99164-7040, USA, E-mail address:
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36
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Mwangi W, Brown WC, Hope JC, Palmer GH. DEC-205 antigen targeting at a dendritic cell-enriched site and CD40L-directed dendritic cell activation enhances CD4+ T cell priming. (47.12). The Journal of Immunology 2007. [DOI: 10.4049/jimmunol.178.supp.47.12] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Abstract
To enhance DNA vaccine efficacy, we tested the hypothesis that inoculation of calves with a single dose of a DNA vaccine capable of DC recruitment, DC antigen-targeting and activation will prime significant CD4+ T cell responses. To test this hypothesis, we developed a DNA construct, pCC98MSP1, in which a DEC-205-specific single chain antibody was used for DC-targeting of an Anaplasma marginale MSP1a DR-restricted CD4+ T cell antigen. A DNA construct, pCD40L-ED, encoding CD40 ligand was used for DC activation and DNA-encoded Flt3L/GM-CSF were used for DC recruitment. Recombinant CC98MSP1 binds to DEC-205 in vitro and to skin DCs in situ. In a dose-escalation experiment, DR-matched calves were immunized with a single dose of pCC98MSP1 (0.25–3mg) mixed with pCD40L-ED, pFlt-3L and pGM-CSF (0.5mg each). Immunization with 0.25mg pCC98MSP1 primed CD4+ T cell responses detectable in fresh PBMC 1wk post-immunization (PI). A dose dependent CD4+ T cell response was detected and surprisingly, at 2wks PI, the response induced by 0.25mg was not statistically different from the responses induced by 0.5–3mg pCC98MSP1. The responses were maintained for >9wks PI and underwent rapid recall 4 days post-boost with 0.25mg pCC98MSP1. This data supports the hypothesis that immunization with a single dose of a DNA vaccine capable of DC recruitment, DC-antigen targeting and activation enhances vaccine efficacy.
Funding: USDA-CSREES 2005-01693
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Affiliation(s)
- Waithaka Mwangi
- 1Texas A&M University, VTPB MS: 4467, College Station, TX, 77843,
| | - Wendy C. Brown
- 2Veterinary Microbiology/Pathology, Washington State University, Bustad Hall 321, MS 7040, Pullman, WA, 99164,
| | - Jayne C. Hope
- 3Institute of Animal Health, Compton, Newbury, RG20 7NN, Berkshire, United Kingdom
| | - Guy H. Palmer
- 2Veterinary Microbiology/Pathology, Washington State University, Bustad Hall 321, MS 7040, Pullman, WA, 99164,
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37
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Brown WC, Han S, Mwangi W, Palmer GH, Norimine J. Tetramer staining of Anaplasma marginale specific CD4 T cells following major surface protein immunization reveals the rapid loss of specific T cells in response to infection (B23). The Journal of Immunology 2007. [DOI: 10.4049/jimmunol.178.supp.b23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Abstract
Immunization with A. marginale major surface protein (MSP)2 and Th1 adjuvants induced strong CD4 T cell proliferative and IFN-γ responses in cattle, that upon challenge were rapidly and permanently lost. To determine if A. marginale infection induced suppression or peripheral deletion of antigen-specific T cells, MHC class II tetramers were used to enumerate epitope-specific T cells following immunization of calves with a DNA construct encoding the 30-mer F2-5 epitope of MSP1a and infection six months later. As observed for MSP2, the MSP1a F2-5 peptide-specific CD4 T cell responses, still strong at the time of challenge, rapidly disappeared by 2–4 weeks. BoLA MHC class II DRB3 *1101 tetramers were constructed with the 15-mer core F2-5 epitope, designated F2-5B, linked to the DRB3 chain. Tetramer-stained PBMC obtained following immunization and challenge were selected with anti-PE beads prior to FACS analysis to increase the sensitivity of detection. The loss of MSP1a peptide F2-5-specific T cell responses was paralleled by a rapid decline in circulating DRB3 *1101-F2-5B tetramer-positive CD4 T cells after challenge, showing that the lack of response is not simply due to anergy or suppression. Our data support the hypothesis that the antigen-specific cells undergo activation-induced cell death in response to the infection, as tetramer-positive cells were not detected in spleen or liver.
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Affiliation(s)
- Wendy C Brown
- 1Veterinary Microbiology and Pathology, Washington State University, Grimes Way, Pullman, WA, 99164-7040,
| | - Sushan Han
- 1Veterinary Microbiology and Pathology, Washington State University, Grimes Way, Pullman, WA, 99164-7040,
| | - Waithaka Mwangi
- 2Veterinary Pathobiology, Texas A & M University, CVM, College Station, TX, 77843
| | - Guy H Palmer
- 1Veterinary Microbiology and Pathology, Washington State University, Grimes Way, Pullman, WA, 99164-7040,
| | - Junzo Norimine
- 1Veterinary Microbiology and Pathology, Washington State University, Grimes Way, Pullman, WA, 99164-7040,
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38
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Abstract
We sought to identify antigens from Haemonchus contortus, an abomasal nematode of small ruminants, that stimulate local (abomasal lymph node, ALN) CD4+ T lymphocyte responses during a primary infection. Results led to a focus on antigens from the parasite intestine. The H. contortus intestine proved to be a major source of antigens that stimulated ALN CD4+, CD25+ T lymphocyte responses during infections in lambs. When stimulated by intestinal antigens, ALN lymphocytes from these lambs expressed IL-4 and IL-13 transcripts, and, more variably, IFN-gamma. An immunoaffinity-purified fraction, enriched for H. contortus apical intestinal membrane proteins, stimulated similar ALN responses. On further fractionation, antigens from six size classes (ranging from 30 to 200 kDa) also stimulated proliferation of ALN lymphocytes. Mass spectrometry analysis of these size classes identified several known apical intestinal membrane proteins from H. contortus. The results show that H. contortus intestinal antigens warrant investigation in strategies to induce mucosal immunity against this parasite. The specific proteins identified have value for this purpose. The results are in contrast with the now generalized idea that H. contortus intestinal antigens are 'hidden' from the host immune system, and this issue is discussed. The approach also has potential application to other gastrointestinal nematode parasites.
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Affiliation(s)
- D P Jasmer
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164-7040, USA.
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Lopez JE, Palmer GH, Brayton KA, Dark MJ, Leach SE, Brown WC. Immunogenicity of Anaplasma marginale type IV secretion system proteins in a protective outer membrane vaccine. Infect Immun 2007; 75:2333-42. [PMID: 17339347 PMCID: PMC1865776 DOI: 10.1128/iai.00061-07] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Rickettsial pathogens in the genera Anaplasma and Ehrlichia cause acute infection in immunologically naive hosts and are major causes of tick-borne disease in animals and humans. Immunization with purified outer membranes induces protection against acute Anaplasma marginale infection and disease, and a proteomic and genomic approach recently identified 21 proteins within the outer membrane immunogen in addition to the well-characterized major surface proteins MSP1 to MSP5. Among the newly described proteins were the type IV secretion system (TFSS) proteins VirB9, VirB10, and conjugal transfer protein (CTP). In other gram-negative bacteria, TFSS proteins form channels, facilitate secretion of molecules, and are required for intracellular survival. However, TFSS proteins have not been explored as vaccine antigens. In this study we demonstrate that in Anaplasma marginale outer membrane-vaccinated cattle, VirB9, VirB10, and CTP are recognized by serum immunoglobulin G2 (IgG2) and stimulate memory T-lymphocyte proliferation and gamma interferon secretion. VirB9 induced the greatest proliferation in CD4+ T-cell lines, and VirB9-specific CD4+ T-cell clones responded to three A. marginale strains, confirming the VirB9-specific T-cell responses are directed against epitopes in the native protein. The three TFSS proteins are highly conserved with orthologous proteins in Anaplasma phagocytophilum, Ehrlichia chaffeensis, and Ehrlichia canis. Recognition of TFSS antigens by CD4+ T cells and by IgG2 from cattle immunized with the protective outer membrane fraction provides a rationale for including these proteins in development of vaccines against A. marginale and related pathogens.
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Affiliation(s)
- Job E Lopez
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164-7040, USA
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40
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Bastos RG, Johnson WC, Brown WC, Goff WL. Differential response of splenic monocytes and DC from cattle to microbial stimulation with Mycobacterium bovis BCG and Babesia bovis merozoites. Vet Immunol Immunopathol 2007; 115:334-45. [PMID: 17161869 DOI: 10.1016/j.vetimm.2006.11.001] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2006] [Revised: 10/25/2006] [Accepted: 11/02/2006] [Indexed: 10/23/2022]
Abstract
Both bovine peripheral blood monocyte-derived dendritic cells (DC) and myeloid DC from afferent lymph have been described, but resident DC from other bovine tissues have not been fully characterized. The spleen as a secondary lymphoid organ is central to the innate and acquired immune response to various diseases particularly hemoprotozoan infections like babesiosis. Therefore, we developed methods to demonstrate the presence of myeloid DC from the spleen of cattle and have partially characterized a DC population as well as another myeloid cell population with monocyte characteristics. The phenotypic profile of each population was CD13+CD172a+/-CD14-CD11a-CD11b+/-CD11c+ and CD172a+CD13+/-CD14+CD11a-CD11b+/-CD11c+, respectively. The CD13+ population was found exclusively in the spleen whereas the CD172a+ population was present at the same percentage in the spleen and peripheral blood. CD13+ cells developed a typical veiled appearance when in culture for 96 h. The two cell populations differed in their ability to produce nitric oxide and had a different pattern of cytokine mRNA when stimulated with Mycobacterium bovis BCG or Babesia bovis merozoites. The data demonstrate the presence of a myeloid splenic DC with attributes consistent with an immature status.
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Affiliation(s)
- R G Bastos
- Animal Disease Research Unit, USDA-ARS, Washington State University, 3003 ADBF, P.O. Box 646630, Pullman, WA 99164-6630, USA
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41
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Mwangi W, Brown WC, Splitter GA, Davies CJ, Howard CJ, Hope JC, Aida Y, Zhuang Y, Hunter BJ, Palmer GH. DNA vaccine construct incorporating intercellular trafficking and intracellular targeting motifs effectively primes and induces memory B- and T-cell responses in outbred animals. Clin Vaccine Immunol 2007; 14:304-11. [PMID: 17215335 PMCID: PMC1828862 DOI: 10.1128/cvi.00363-06] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
We developed a vaccine construct in which a BVP22 domain and an invariant-chain major histocompatibility complex class II-targeting motif capable of enhancing dendritic cell antigen uptake and presentation were fused to a sequence encoding a B- and T-cell antigen from the Anaplasma marginale major surface protein 1a and tested whether this construct would prime and expand immune responses in outbred calves. A single inoculation with this construct effectively primed the immune responses, as demonstrated by a significant enhancement of CD4(+) T-cell proliferation compared to that in calves identically inoculated but inoculated with a DNA construct lacking the targeting domains and compared to that in calves inoculated with an empty vector. These proliferative responses were mirrored by priming and expansion of gamma interferon-positive CD4(+) T cells and immunoglobulin G responses against the linked B-cell epitope. Priming by the single immunization induced memory that underwent rapid recall following reexposure to the antigen. These results demonstrate that DNA vaccines targeting key intercellular and intracellular events significantly enhance priming and expansion and support the feasibility of single-dose DNA immunization in outbred populations.
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Affiliation(s)
- Waithaka Mwangi
- Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington 99164, USA.
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42
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Zhuang Y, Mwangi W, Brown WC, Davis WC, Hope JC, Palmer GH. Characterization of a phenotypically unique population of CD13+ dendritic cells resident in the spleen. Clin Vaccine Immunol 2006; 13:1064-9. [PMID: 16960120 PMCID: PMC1563577 DOI: 10.1128/cvi.00178-06] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Immature dendritic cells (DCs) resident in bovine spleens represent a distinct CD11a(+) CD11c(+) CD13(+) CD172(+) CD205(+) population compared to those circulating in peripheral blood or trafficking via afferent lymph. Upon cytokine-induced maturation, splenic DCs both efficiently present antigen in the stimulation of allogeneic lymphocyte proliferation and recall antigen-specific responses.
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Affiliation(s)
- Yan Zhuang
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, 99164-7040, USA
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43
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Lahmers KK, Hedges JF, Jutila MA, Deng M, Abrahamsen MS, Brown WC. Comparative gene expression by WC1
+
γδ and CD4
+
αβ T lymphocytes, which respond to
Anaplasma marginale
, demonstrates higher expression of chemokines and other myeloid cell‐associated genes by WC1
+
γδ T cells. J Leukoc Biol 2006; 80:939-52. [PMID: 17005908 DOI: 10.1189/jlb.0506353] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023] Open
Abstract
The functions of gammadelta T cells are enigmatic, and these cells are often considered as evolutionary remnants of well-characterized alphabeta T cells. However, their conservation throughout evolution suggests that gammadelta T cells are biologically unique. In ruminants, gammadelta T cells expressing the workshop cluster 1 (WC1) scavenger receptor comprise a large proportion of circulating lymphocytes, suggesting these cells are biologically relevant and functionally different from alphabeta T cells. In fact, bovine WC1(+) gammadelta T cells can act as APC for alphabeta T cells, indicating they may express genes encoding proteins associated with innate immunity. The present study was designed to compare immune function gene expression profiles of clonal populations of WC1(+) gammadelta and CD4(+) alphabeta T cells derived from the same animal, which respond to major surface protein 2 (MSP2) of the intraerythrocytic rickettsial pathogen of cattle, Anaplasma marginale. Gene expression profiles of activated T cell clones were compared using a microarray format, and differential gene expression was confirmed by real-time RT-PCR and protein analyses. We demonstrate that although MSP2-specific alphabeta and gammadelta T cell clones express many of the same genes, gammadelta T cell clones express high levels of genes associated with myeloid cells, including chemokines CCL2, CXCL1, CXCL2, CXCL6, and surface receptors CD68, CD11b, macrophage scavenger receptor 1, macrophage mannose receptor, and galectin-3. It is important that many of these genes were also expressed at higher levels in polyclonal WC1(+) gammadelta T cells when compared with CD4(+) alphabeta T cells selected from peripheral blood.
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MESH Headings
- Anaplasma marginale/immunology
- Animals
- CD4-Positive T-Lymphocytes/immunology
- Cattle
- Cell Line
- Chemokines/genetics
- Chemokines/immunology
- Gene Expression Profiling
- Membrane Glycoproteins/biosynthesis
- Myeloid Cells/immunology
- Oligonucleotide Array Sequence Analysis/methods
- RNA, Messenger/biosynthesis
- RNA, Messenger/genetics
- Receptors, Antigen, T-Cell, alpha-beta/genetics
- Receptors, Antigen, T-Cell, alpha-beta/immunology
- Receptors, Antigen, T-Cell, gamma-delta/genetics
- Receptors, Antigen, T-Cell, gamma-delta/immunology
- Receptors, Cell Surface/genetics
- Receptors, Cell Surface/immunology
- Reverse Transcriptase Polymerase Chain Reaction/methods
- Sensitivity and Specificity
- T-Lymphocyte Subsets/immunology
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Affiliation(s)
- Kevin K Lahmers
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164-7040, USA
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44
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Norimine J, Han S, Brown WC. Quantitation of Anaplasma marginale major surface protein (MSP)1a and MSP2 epitope-specific CD4+ T lymphocytes using bovine DRB3*1101 and DRB3*1201 tetramers. Immunogenetics 2006; 58:726-39. [PMID: 16924490 DOI: 10.1007/s00251-006-0140-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2006] [Accepted: 06/18/2006] [Indexed: 01/23/2023]
Abstract
Antigen-specific CD4+ T cells play a critical role in protective immunity to many infectious pathogens. Although the antigen-specific CD4+ T cells can be measured by functional assays such as proliferation or cytokine enzyme-linked immunospot, such assays are limited to a specific function and cannot quantify anergic or suppressed T cells. In contrast, major histocompatiblity complex (MHC) class II tetramers can enumerate epitope-specific CD4+ T cells independent of function. In this paper, we report the construction of bovine leukocyte antigen MHC class II tetramers using a novel mammalian cell system to express soluble class II DRA/DRB3 molecules and defined immunodominant peptide epitopes of Anaplasma marginale major surface proteins (MSPs). Phycoerythrin-labeled tetramers were either loaded with exogenous peptide or constructed with the peptide epitope linked to the N terminus of the DRB3 chain. A DRB3*1101 tetramer loaded with MSP1a peptide F2-5B (ARSVLETLAGHVDALG) and DRB3*1201 tetramers loaded with MSP1a peptide F2-1-1b (GEGYATYLAQAFA) or MSP2 peptide P16-7 (NFAYFGGELGVRFAF) specifically stained antigen-specific CD4+ T cell lines and clones. Tetramers constructed with the T-cell epitope linked to the DRB3 chain were slightly better at labeling CD4+ T cells. In one cell line, the number of tetramer-positive T cells increased to approximately 94% of the CD4+ T cells after culture for 21 weeks with specific antigen. This novel technology should be useful to track the fate of antigen-specific CD4+ T-cell responses in cattle after immunization or infection with persistent pathogens, such as A. marginale, that modulate the host immune response.
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Affiliation(s)
- Junzo Norimine
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164-7040, USA.
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45
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Macmillan H, Brayton KA, Palmer GH, McGuire TC, Munske G, Siems WF, Brown WC. Analysis of the Anaplasma marginale major surface protein 1 complex protein composition by tandem mass spectrometry. J Bacteriol 2006; 188:4983-91. [PMID: 16788207 PMCID: PMC1483013 DOI: 10.1128/jb.00170-06] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The protective major surface protein 1 (MSP1) complex of Anaplasma marginale is a heteromer of MSP1a and MSP1b, encoded by a multigene family. The msp1beta sequences were highly conserved throughout infection. However, liquid chromatography-tandem mass spectrometry analysis identified only a single MSP1b protein, MSP1b1, within the MSP1 complex.
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Affiliation(s)
- Henriette Macmillan
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164-7040, USA
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46
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Abstract
Babesial parasites infect cattle in tropical and temperate regions of the world and cause significant morbidity and mortality. Discovery of protective antigens that could be used in a killed vaccine has been slow and to date there are few promising vaccine candidates for cattle Babesia. This review describes mechanisms of protective innate and adaptive immune responses to babesial parasites and different strategies to identify potentially protective protein antigens of B. bovis, B. bigemina, and B. divergens. Successful parasites often cause persistent infection, and this paper also discusses how B. bovis evades and regulates the immune response to promote survival of parasite and host. Development of successful non-living recombinant vaccines will depend on increased understanding of protective immune mechanisms and availability of parasite genomes.
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Affiliation(s)
- W C Brown
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA 99164-7040, USA.
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47
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Noh SM, Brayton KA, Knowles DP, Agnes JT, Dark MJ, Brown WC, Baszler TV, Palmer GH. Differential expression and sequence conservation of the Anaplasma marginale msp2 gene superfamily outer membrane proteins. Infect Immun 2006; 74:3471-9. [PMID: 16714578 PMCID: PMC1479288 DOI: 10.1128/iai.01843-05] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Bacterial pathogens in the genera Anaplasma and Ehrlichia encode a protein superfamily, pfam01617, which includes the predominant outer membrane proteins (OMPs) of each species, major surface protein 2 (MSP2) and MSP3 of Anaplasma marginale and Anaplasma ovis, Anaplasma phagocytophilum MSP2 (p44), Ehrlichia chaffeensis p28-OMP, Ehrlichia canis p30, and Ehrlichia ruminantium MAP1, and has been shown to be involved in both antigenic variation within the mammalian host and differential expression between the mammalian and arthropod hosts. Recently, complete sequencing of the A. marginale genome has identified an expanded set of genes, designated omp1-14, encoding new members of this superfamily. Transcriptional analysis indicated that, with the exception of the three smallest open reading frames, omp2, omp3, and omp6, these superfamily genes are transcribed in A. marginale-infected erythrocytes, tick midgut and salivary glands, and the IDE8 tick cell line. OMPs 1, 4, 7 to 9, and 11 were confirmed to be expressed as proteins by A. marginale within infected erythrocytes, with expression being either markedly lower (OMPs 1, 4, and 7 to 9) or absent (OMP11) in infected tick cells, which reflected regulation at the transcript level. Although the pfam01617 superfamily includes the antigenically variable MSP2 and MSP3 surface proteins, analysis of the omp1-14 sequences throughout a cycle of acute and persistent infection in the mammalian host and tick transmission reveals a high degree of conservation, an observation supported by sequence comparisons between the St. Maries strain and Florida strain genomes.
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Affiliation(s)
- Susan M Noh
- Program in Vector-borne Diseas, Department of Microbiology and Pathology, Washington State University, Pullman, WA 99164-6630, USA.
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48
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LeRoith T, Berens SJ, Brayton KA, Hines SA, Brown WC, Norimine J, McElwain TF. The Babesia bovis merozoite surface antigen 1 hypervariable region induces surface-reactive antibodies that block merozoite invasion. Infect Immun 2006; 74:3663-7. [PMID: 16714599 PMCID: PMC1479293 DOI: 10.1128/iai.00032-06] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
A hypervariable region (HVR) previously identified in the carboxy-terminal one-third of the Babesia bovis variable merozoite surface antigen family was more extensively analyzed in merozoite surface antigen 1 (MSA-1) from 16 strains and isolates. The MSA-1 HVR is proline rich and contains three semiconserved motifs nearly identical to those described for the related family member MSA-2. Two MSA-1-specific monoclonal antibodies previously shown to be reactive with the merozoite surface bound to a recombinant construct encoding the HVR, indicating that the HVR is surface exposed and accessible to antibody binding. Importantly, these surface-reactive, HVR-specific monoclonal antibodies were capable of inhibiting merozoite infectivity of the host erythrocyte in vivo. The results indicate that the MSA-1 HVR is involved in erythrocyte invasion and suggest that selection of MSA-1 variants may be driven by invasion-blocking antibodies.
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Affiliation(s)
- Tanya LeRoith
- Program in Vector-Borne Diseases, Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, Washington 99164-7040, USA.
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Goff WL, Storset AK, Johnson WC, Brown WC. Bovine splenic NK cells synthesize IFN-gamma in response to IL-12-containing supernatants from Babesia bovis-exposed monocyte cultures. Parasite Immunol 2006; 28:221-8. [PMID: 16629708 DOI: 10.1111/j.1365-3024.2006.00830.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The spleen is a critical effector organ functioning, in haemoparasitic diseases like babesiosis, to destroy the pathogen and clear the host of infected erythrocytes. It has an important role in both innate responses and adaptive immune responses. Young calves demonstrate a strong spleen-dependent innate response to an initial infection with Babesia bovis involving the type-1 regulating cytokines IL-12 and IFN-gamma. However, the specific splenic cell types that produce IFN-gamma in response to infection and the cellular factors that regulate the induction have not been fully determined. Splenic NKp46(+) NK cells were identified and purified. They consisted of CD3(-), CD2(+/-), and CD8(+/-) populations. NK cells responded to exogenous IL-12 and IL-18 with the production of IFN-gamma. Functionally, IL-18 served as a potent co-stimulant with IL-12 for IFN-gamma production. Finally, innate IFN-gamma production was induced in splenic NK cells in the presence of supernatants from B. bovis merozoite-exposed monocytes in an IL-12 pathway-dependent manner.
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Affiliation(s)
- Will L Goff
- Animal Disease Research Unit, USDA-ARS, Pullman, Washington, USA.
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