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Mosqueda J, Hernandez-Silva DJ, Ueti MW, Cruz-Reséndiz A, Marquez-Cervantez R, Valdez-Espinoza UM, Dang-Trinh MA, Nguyen TT, Camacho-Nuez M, Mercado-Uriostegui MA, Aguilar-Tipacamú G, Ramos-Aragon JA, Hernandez-Ortiz R, Kawazu SI, Igarashi I. Spherical Body Protein 4 from Babesia bigemina: A Novel Gene That Contains Conserved B-Cell Epitopes and Induces Cross-Reactive Neutralizing Antibodies in Babesia ovata. Pathogens 2023; 12:pathogens12030495. [PMID: 36986418 PMCID: PMC10051436 DOI: 10.3390/pathogens12030495] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2023] [Revised: 03/18/2023] [Accepted: 03/20/2023] [Indexed: 03/30/2023] Open
Abstract
Bovine babesiosis is a tick-transmitted disease caused by intraerythrocytic protozoan parasites of the genus Babesia. Its main causative agents in the Americas are Babesia bigemina and Babesia bovis, while Babesia ovata affects cattle in Asia. All Babesia species secrete proteins stored in organelles of the apical complex, which are involved in all steps of the invasion process of vertebrate host cells. Unlike other apicomplexans, which have dense granules, babesia parasites instead have large, round intracellular organelles called spherical bodies. Evidence suggests that proteins from these organelles are released during the process of invading red blood cells, where spherical body proteins (SBPs) play an important role in cytoskeleton reorganization. In this study, we characterized the gene that encodes SBP4 in B. bigemina. This gene is transcribed and expressed in the erythrocytic stages of B. bigemina. The sbp4 gene consists of 834 nucleotides without introns that encode a protein of 277 amino acids. In silico analysis predicted a signal peptide that is cleaved at residue 20, producing a 28.88-kDa protein. The presence of a signal peptide and the absence of transmembrane domains suggest that this protein is secreted. Importantly, when cattle were immunized with recombinant B. bigemina SBP4, antibodies identified B. bigemina and B. ovata merozoites according to confocal microscopy observations and were able to neutralize parasite multiplication in vitro for both species. Four peptides with predicted B-cell epitopes were identified to be conserved in 17 different isolates from six countries. Compared with the pre-immunization sera, antibodies against these conserved peptides reduced parasite invasion in vitro by 57%, 44%, 42%, and 38% for peptides 1, 2, 3, and 4, respectively (p < 0.05). Moreover, sera from cattle infected with B. bigemina cattle contained antibodies that recognized the individual peptides. All these results support the concept of spb4 as a new gene in B. bigemina that should be considered a candidate for a vaccine to control bovine babesiosis.
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Affiliation(s)
- Juan Mosqueda
- Immunology and Vaccines Laboratory, C. A. Facultad de Ciencias Naturales, Universidad Autonoma de Queretaro, Carretera a Chichimequillas, Ejido Bolaños, Queretaro 76140, Mexico
- C.A. Salud Animal y Microbiologia Ambiental, Facultad de Ciencias Naturales, Universidad Autonoma de Queretaro, Av. de las Ciencias s/n Col Juriquilla, Queretaro 76230, Mexico
| | - Diego Josimar Hernandez-Silva
- Immunology and Vaccines Laboratory, C. A. Facultad de Ciencias Naturales, Universidad Autonoma de Queretaro, Carretera a Chichimequillas, Ejido Bolaños, Queretaro 76140, Mexico
- Ph.D. Program in Biological Sciences, College of Natural Sciences, Autonomous University of Queretaro, Av. de las Ciencias s/n Col Juriquilla, Queretaro 76230, Mexico
| | - Massaro W Ueti
- Animal Diseases Research Unit, Agricultural Research Service, US Department of Agriculture, Pullman, WA 99164, USA
| | - Adolfo Cruz-Reséndiz
- Immunology and Vaccines Laboratory, C. A. Facultad de Ciencias Naturales, Universidad Autonoma de Queretaro, Carretera a Chichimequillas, Ejido Bolaños, Queretaro 76140, Mexico
- Veterinary Medicine Program, College of Natural Sciences, Autonomous University of Queretaro, Av. de las Ciencias s/n Col Juriquilla, Queretaro 76230, Mexico
| | - Ricardo Marquez-Cervantez
- Immunology and Vaccines Laboratory, C. A. Facultad de Ciencias Naturales, Universidad Autonoma de Queretaro, Carretera a Chichimequillas, Ejido Bolaños, Queretaro 76140, Mexico
- Veterinary Medicine Program, College of Natural Sciences, Autonomous University of Queretaro, Av. de las Ciencias s/n Col Juriquilla, Queretaro 76230, Mexico
| | - Uriel Mauricio Valdez-Espinoza
- Immunology and Vaccines Laboratory, C. A. Facultad de Ciencias Naturales, Universidad Autonoma de Queretaro, Carretera a Chichimequillas, Ejido Bolaños, Queretaro 76140, Mexico
- Master's Program in Animal Health and Production, Facultad de Medicina Veterinaria y Zootecnia, Universidad Nacional Autonoma de Mexico, Av. Universidad 3000, Edificio A, Delegacion Coyoacan, Col. Ciudad Universitaria, Mexico City 04510, Mexico
- CENID-Salud Animal e Inocuidad/INIFAP, Carretera Federal Cuernavaca-Cuautla #8534, Col. Progreso, Jiutepec 62574, Mexico
| | - Minh-Anh Dang-Trinh
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan
| | - Thu-Thuy Nguyen
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan
| | - Minerva Camacho-Nuez
- Posgrado en Ciencias Genomicas, Universidad Autonoma de la Ciudad de Mexico, San Lorenzo 290, Esquina Roberto Gayol, Col. del Valle Sur, Delegacion Benito Juarez, Mexico City 03100, Mexico
| | - Miguel Angel Mercado-Uriostegui
- Immunology and Vaccines Laboratory, C. A. Facultad de Ciencias Naturales, Universidad Autonoma de Queretaro, Carretera a Chichimequillas, Ejido Bolaños, Queretaro 76140, Mexico
- C.A. Salud Animal y Microbiologia Ambiental, Facultad de Ciencias Naturales, Universidad Autonoma de Queretaro, Av. de las Ciencias s/n Col Juriquilla, Queretaro 76230, Mexico
| | - Gabriela Aguilar-Tipacamú
- C.A. Salud Animal y Microbiologia Ambiental, Facultad de Ciencias Naturales, Universidad Autonoma de Queretaro, Av. de las Ciencias s/n Col Juriquilla, Queretaro 76230, Mexico
| | - Juan Alberto Ramos-Aragon
- CENID-Salud Animal e Inocuidad/INIFAP, Carretera Federal Cuernavaca-Cuautla #8534, Col. Progreso, Jiutepec 62574, Mexico
| | - Ruben Hernandez-Ortiz
- CENID-Salud Animal e Inocuidad/INIFAP, Carretera Federal Cuernavaca-Cuautla #8534, Col. Progreso, Jiutepec 62574, Mexico
| | - Shin-Ichiro Kawazu
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan
| | - Ikuo Igarashi
- National Research Center for Protozoan Diseases, Obihiro University of Agriculture and Veterinary Medicine, Obihiro 080-8555, Japan
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Carrisosa M, Terra-Long MT, Cline J, Macklin KS, Dormitorio T, Wang C, Hauck R. Multilocus Sequence Typing of Eimeria maxima in Commercial Broiler Flocks. Avian Dis 2022; 66:389-395. [PMID: 36715469 DOI: 10.1637/aviandiseases-d-22-00040] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Accepted: 08/25/2022] [Indexed: 11/10/2022]
Abstract
About 35% of all broiler flocks in the United States receive an anticoccidial vaccine, but it is not possible to easily differentiate Eimeria vaccine strains from Eimeria field isolates. Being able to do that would allow using vaccines in a more targeted way. The objective of this study was to collect Eimeria maxima isolates from broiler flocks that received anticoccidial feed additives and flocks that had been vaccinated against coccidia and then test them with a multilocus sequencing typing (MLST) scheme developed for this study. Fecal samples were obtained from commercial broiler flocks in Alabama and Tennessee. Oocyst counts in samples tended to be lower in flocks receiving anticoccidial feed additives and higher in vaccinated flocks. Selected samples were screened for presence of E. maxima by quantitative PCR, and Eimeria spp. composition was investigated by next-generation amplicon sequencing (NGAS) in 37 E. maxima positive samples. Other detected Eimeria spp. besides E. maxima were Eimeria acervulina in 35 samples, Eimeria praecox in 23 samples, Eimeria mitis or Eimeria mivati in 17 samples, and Eimeria necatrix or Eimeria tenella in 10 samples. Six partial E. maxima genes (dnaJ domain containing protein, 70-kDa heat shock protein, prolyl endopeptidase, regulator of chromosome condensation domain containing protein, serine carboxypeptidase, and vacuolar proton-translocating ATPase subunit) of 46 samples were sequenced. The MLST scheme was able to differentiate two vaccines from each other. Three of 17 samples from vaccinated flocks differed from the vaccine used in the flock, while 16 of 29 samples from unvaccinated flocks differed from the vaccine. However, there was also a large number of low-quality, ambiguous chromatograms and negative PCRs for the selected genes. If and when more advanced, possibly next-generation sequencing-based methods will be developed, the genes should be considered as targets.
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Affiliation(s)
- M Carrisosa
- Department of Poultry Science, Auburn University, Auburn, AL 36849
| | - M T Terra-Long
- Department of Poultry Science, Auburn University, Auburn, AL 36849
| | - J Cline
- Wayne Farms, Oakwood, GA 30566
| | - K S Macklin
- Department of Poultry Science, Auburn University, Auburn, AL 36849
| | - T Dormitorio
- Department of Poultry Science, Auburn University, Auburn, AL 36849
| | - C Wang
- Department of Pathobiology, Auburn University, Auburn, AL 36849
| | - R Hauck
- Department of Poultry Science, Auburn University, Auburn, AL 36849, .,Department of Pathobiology, Auburn University, Auburn, AL 36849
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Montenegro VN, Paoletta MS, Jaramillo Ortiz JM, Suarez CE, Wilkowsky SE. Identification and characterization of a Babesia bigemina thrombospondin-related superfamily member, TRAP-1: a novel antigen containing neutralizing epitopes involved in merozoite invasion. Parasit Vectors 2020; 13:602. [PMID: 33261638 PMCID: PMC7705850 DOI: 10.1186/s13071-020-04469-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Accepted: 11/05/2020] [Indexed: 11/22/2022] Open
Abstract
Background Thrombospondin-related anonymous protein (TRAP) has been described as a potential vaccine candidate for several diseases caused by apicomplexan parasites. However, this protein and members of this family have not yet been characterized in Babesia bigemina, one of the most prevalent species causing bovine babesiosis. Methods The 3186-bp Babesia bigemina TRAP-1 (BbiTRAP-1) gene was identified by a bioinformatics search using the B. bovis TRAP-1 sequence. Members of the TRAP and TRAP-related protein families (TRP) were identified in Babesia and Theileria through a search of the TSP-1 adhesive domain, which is the hallmark motif in both proteins. Structural modeling and phylogenetic analysis were performed with the identified TRAP proteins. A truncated recombinant BbiTRAP-1 that migrates at approximately 107 kDa and specific antisera were produced and used in Western blot analysis and indirect fluorescent antibody tests (IFAT). B-cell epitopes with neutralizing activity in BbiTRAP-1 were defined by enzyme-linked immunosorbent assays (ELISA) and invasion assays. Results Three members of the TRAP family of proteins were identified in B. bigemina (BbiTRAP-1 to -3). All are type 1 transmembrane proteins containing the von Willebrand factor A (vWFA), thrombospondin type 1 (TSP-1), and cytoplasmic C-terminus domains, as well as transmembrane regions. The BbiTRAP-1 predicted structure also contains a metal ion-dependent adhesion site for interaction with the host cell. The TRP family in Babesia and Theileria species contains the canonical TSP-1 domain but lacks the vWFA domain and together with TRAP define a novel gene superfamily. A variable number of tandem repeat units are present in BbiTRAP-1 and could be used for strain genotyping. Western blot and IFAT analysis confirmed the expression of BbiTRAP-1 by blood-stage parasites. Partial recognition by a panel of sera from B. bigemina-infected cattle in ELISAs using truncated BbiTRAP-1 suggests that this protein is not an immunodominant antigen. Additionally, bovine anti-recombinant BbiTRAP-1 antibodies were found to be capable of neutralizing merozoite invasion in vitro. Conclusions We have identified the TRAP and TRP gene families in several Babesia and Theileria species and characterized BbiTRAP-1 as a novel antigen of B. bigemina. The functional relevance and presence of neutralization-sensitive B-cell epitopes suggest that BbiTRAP-1 could be included in tests for future vaccine candidates against B. bigemina.![]()
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Affiliation(s)
- Valeria Noely Montenegro
- Instituto de Agrobiotecnología y Biología Molecular (IABIMO) (INTA-CONICET), De Los Reseros y Dr. Nicolás Repetto s/N, P.O. Box 25, B1712WAA, Castelar, Buenos Aires, Argentina
| | - Martina Soledad Paoletta
- Instituto de Agrobiotecnología y Biología Molecular (IABIMO) (INTA-CONICET), De Los Reseros y Dr. Nicolás Repetto s/N, P.O. Box 25, B1712WAA, Castelar, Buenos Aires, Argentina
| | - José M Jaramillo Ortiz
- Instituto de Agrobiotecnología y Biología Molecular (IABIMO) (INTA-CONICET), De Los Reseros y Dr. Nicolás Repetto s/N, P.O. Box 25, B1712WAA, Castelar, Buenos Aires, Argentina
| | - Carlos E Suarez
- Department of Veterinary Microbiology and Pathology, Washington State University, Pullman, WA, 99164, USA.,Animal Disease Research Unit, U.S. Department of Agriculture-Agricultural Research Service (USDA-ARS), Washington State University, 3003 ADBF, P.O. Box 646630, Pullman, WA, 99164, USA
| | - Silvina Elizabeth Wilkowsky
- Instituto de Agrobiotecnología y Biología Molecular (IABIMO) (INTA-CONICET), De Los Reseros y Dr. Nicolás Repetto s/N, P.O. Box 25, B1712WAA, Castelar, Buenos Aires, Argentina.
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Humoral and Cell-Mediated Immune Response Validation in Calves after a Live Attenuated Vaccine of Babesia bigemina. Pathogens 2020; 9:pathogens9110936. [PMID: 33187270 PMCID: PMC7698288 DOI: 10.3390/pathogens9110936] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Revised: 10/31/2020] [Accepted: 11/07/2020] [Indexed: 12/17/2022] Open
Abstract
The current vaccines to control bovine Babesia bigemina (B. bigemina) infection are not fully protective and vaccination failures incur heavy losses to the cattle industry around the world. Using modified micro-aerophilous stationary phase, we developed a culture-derived attenuated live vaccine against B. bigemina and tested a single subcutaneous inoculation of 2 × 108 infected erythrocytes in calves. The protection was measured after a lethal intravenous challenge with 5 × 108 virulent calf-derived B. bigemina. Our results demonstrated that a single shot of attenuated vaccine was capable of inducing robust humoral and cell-mediated immune responses in calves. We found a significant increase in the IgG antibody titers post-challenge and a strong proliferation of both CD4+ and CD8+ T cells contributing towards the protection. Our vaccine provided complete protection and parasitic clearance, which was followed for more than 100 days post-challenge. This immunity against babesiosis was directly linked to strong humoral responses; however, the parasitic clearance was attributed to significant T cells effector responses in vaccinated calves as compared to the infected control calves. We anticipate that these results will be helpful in the development of more efficient culture-derived vaccines against Babesia infections, thus reducing significant global economic losses to farmers and the cattle industry.
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Jaimes-Dueñez J, Triana-Chávez O, Holguín-Rocha A, Tobon-Castaño A, Mejía-Jaramillo AM. Molecular surveillance and phylogenetic traits of Babesia bigemina and Babesia bovis in cattle (Bos taurus) and water buffaloes (Bubalus bubalis) from Colombia. Parasit Vectors 2018; 11:510. [PMID: 30208941 PMCID: PMC6136160 DOI: 10.1186/s13071-018-3091-2] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Accepted: 08/31/2018] [Indexed: 12/05/2022] Open
Abstract
Background Babesia bigemina and B. bovis are two economically important hemoparasites affecting both cattle and buffaloes involved in dairy and beef production. In Colombia, although some parasitological and serological studies suggest an endemicity of these pathogens in areas under 1000 m, little is known about its molecular prevalence in different host. The objective of this study was to estimate the prevalence and molecular traits of these parasites in cattle and buffaloes from two Colombian regions. Methods Between 2014 and 2016, a three-point longitudinal survey was designed in farms from Caribbean and Orinoquia regions to evaluate the molecular prevalence of B. bigemina and B. bovis using a nested PCR (n-PCR) targeting hypothetical protein (hyp) and rhoptry-associated protein (RAP-1) genes, respectively. A total of 1432 cattle, 152 buffalo and 1439 Rhipicephalus microplus samples were analyzed. Moreover, phylogenetic relationship of isolates was analyzed using the 18S rRNA gene. Results A molecular prevalence of 31.6% (24.2% for B. bigemina and 14.4% for B. bovis), 23.6% (6.5% for B. bigemina and 17.7% for B. bovis) and 4.3% (3.5% for B. bigemina and 1.0% for B. bovis) was observed in cattle, buffaloes and Rhipicephalus microplus, respectively. Higher values of infection were observed during the wet season and late wet season; nevertheless, other variables such as age, production type, sex, breed and babesiosis control were also significantly associated with infection. Prevalence analysis showed that B. bovis infection was higher in cattle that coexist with buffaloes, when compared to those which did not. For each species, phylogenetic analyses revealed a high genetic diversity of isolates without clusters related to the isolation source. Conclusions To our knowledge, this is the first longitudinal survey that evaluates through molecular methods, the infection of B. bigemina and B. bovis in two important livestock regions from Colombia. This study reveals that the prevalence of infection by Babesia spp., in cattle and buffaloes are modulated by seasonal variations, host factors and vector traits. Our results provide new insights on the epidemiological aspects of infection of Babesia spp., in cattle and buffaloes, which must be taken into consideration when babesiosis control programs are implemented in the study area. Electronic supplementary material The online version of this article (10.1186/s13071-018-3091-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
| | - Omar Triana-Chávez
- Grupo BCEI, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia
| | - Andrés Holguín-Rocha
- Grupo Malaria, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia
| | - Alberto Tobon-Castaño
- Grupo Malaria, Universidad de Antioquia UdeA, Calle 70 No. 52-21, Medellín, Colombia
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Paoletta MS, López Arias L, de la Fournière S, Guillemi EC, Luciani C, Sarmiento NF, Mosqueda J, Farber MD, Wilkowsky SE. Epidemiology of Babesia, Anaplasma and Trypanosoma species using a new expanded reverse line blot hybridization assay. Ticks Tick Borne Dis 2018; 9:155-163. [DOI: 10.1016/j.ttbdis.2017.08.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Revised: 08/02/2017] [Accepted: 08/24/2017] [Indexed: 01/26/2023]
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Gimenez G, Belaunzarán ML, Magalhães KG, Poncini CV, Lammel EM, González Cappa SM, Bozza PT, Isola ELD. Involvement of TLR6 in the induction of COX-2, PGE2 and IL-10 in macrophages by lipids from virulent S2P and attenuated R1A Babesia bovis strains. Vet Parasitol 2016; 223:127-32. [PMID: 27198789 DOI: 10.1016/j.vetpar.2016.04.033] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2015] [Revised: 04/20/2016] [Accepted: 04/21/2016] [Indexed: 01/28/2023]
Abstract
Toll like receptors (TLRs) are involved in the modulation of diverse host genes expression through a complex network of signalling events that allow for an appropriate response to a microbial pathogen. In the present work we used TLR6KO mice in order to study the role of TLR6 in the immune discrimination of lipids from two Babesia bovis strains, attenuated R1A (LA) and virulent S2P (LV), and the consequent macrophage activation. We demonstrated that TLR6 is required for lipid body induction in murine peritoneal macrophages by both LA and LV. Interestingly, as regards IL-10 and COX-2/PGE2 pathway induction by LA and LV, we observed differences in the biological effects produced by these lipid extracts. Our results indicate a role of TLR6 in the down-modulation of these immunoregulators only in the case of LA, whereas this receptor was not implicated in pro-inflammatory TNFα, IL-6 and KC release induced by LA. Remarkably, LV did not exert the down-modulatory effect observed for LA, supporting the notion that LA and LV possess different lipid composition that could correlate with the polar pathogenic effect of both B. bovis strains.
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Affiliation(s)
- G Gimenez
- Instituto de Investigaciones en Microbiología y Parasitología Médica, UBA, CONICET, Facultad de Medicina, Paraguay 2155 piso 13, C1121ABG Buenos Aires, Argentina.
| | - M L Belaunzarán
- Instituto de Investigaciones en Microbiología y Parasitología Médica, UBA, CONICET, Facultad de Medicina, Paraguay 2155 piso 13, C1121ABG Buenos Aires, Argentina
| | - K G Magalhães
- Laboratório de Imunologia e Inflamação, Departamento de Biologia Celular, Instituto de Biologia, Universidade de Brasília, Distrito Federal, Brazil
| | - C V Poncini
- Instituto de Investigaciones en Microbiología y Parasitología Médica, UBA, CONICET, Facultad de Medicina, Paraguay 2155 piso 13, C1121ABG Buenos Aires, Argentina
| | - E M Lammel
- Instituto de Investigaciones en Microbiología y Parasitología Médica, UBA, CONICET, Facultad de Medicina, Paraguay 2155 piso 13, C1121ABG Buenos Aires, Argentina
| | - S M González Cappa
- Instituto de Investigaciones en Microbiología y Parasitología Médica, UBA, CONICET, Facultad de Medicina, Paraguay 2155 piso 13, C1121ABG Buenos Aires, Argentina
| | - P T Bozza
- Laboratório de Imunofarmacologia, Instituto Oswaldo Cruz-Fundaçao Oswaldo Cruz, Rio de Janeiro, Brazil
| | - E L D Isola
- Instituto de Investigaciones en Microbiología y Parasitología Médica, UBA, CONICET, Facultad de Medicina, Paraguay 2155 piso 13, C1121ABG Buenos Aires, Argentina
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Florin-Christensen M, Suarez CE, Rodriguez AE, Flores DA, Schnittger L. Vaccines against bovine babesiosis: where we are now and possible roads ahead. Parasitology 2014; 141:1-30. [PMID: 25068315 DOI: 10.1017/s0031182014000961] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
SUMMARY Bovine babesiosis caused by the tick-transmitted haemoprotozoans Babesia bovis, Babesia bigemina and Babesia divergens commonly results in substantial cattle morbidity and mortality in vast world areas. Although existing live vaccines confer protection, they have considerable disadvantages. Therefore, particularly in countries where large numbers of cattle are at risk, important research is directed towards improved vaccination strategies. Here a comprehensive overview of currently used live vaccines and of the status quo of experimental vaccine trials is presented. In addition, pertinent research fields potentially contributing to the development of novel non-live and/or live vaccines are discussed, including parasite antigens involved in host cell invasion and in pathogen-tick interactions, as well as the protective immunity against infection. The mining of available parasite genomes is continuously enlarging the array of potential vaccine candidates and, additionally, the recent development of a transfection tool for Babesia can significantly contribute to vaccine design. However, the complication and high cost of vaccination trials hinder Babesia vaccine research, and have so far seriously limited the systematic examination of antigen candidates and prevented an in-depth testing of formulations using different immunomodulators and antigen delivery systems.
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Affiliation(s)
| | - Carlos E Suarez
- Department of Veterinary Microbiology and Pathology,Washington State University,Pullman, WA 99164-7040,USA
| | - Anabel E Rodriguez
- Instituto de Patobiologia,CICVyA, INTA-Castelar, 1686 Hurlingham,Argentina
| | - Daniela A Flores
- Instituto de Patobiologia,CICVyA, INTA-Castelar, 1686 Hurlingham,Argentina
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Thompson C, Baravalle ME, Valentini B, Mangold A, Torioni de Echaide S, Ruybal P, Farber M, Echaide I. Typification of virulent and low virulence Babesia bigemina clones by 18S rRNA and rap-1c. Exp Parasitol 2014; 141:98-105. [PMID: 24681200 DOI: 10.1016/j.exppara.2014.03.016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2013] [Revised: 02/24/2014] [Accepted: 03/04/2014] [Indexed: 11/29/2022]
Abstract
The population structure of original Babesia bigemina isolates and reference strains with a defined phenotypic profile was assessed using 18S rRNA and rap-1c genes. Two reference strains, BbiS2P-c (virulent) and BbiS1A-c (low virulence), were biologically cloned in vitro. The virulence profile of the strains and clones was assessed in vivo. One fully virulent and one low-virulence clone were mixed in identical proportions to evaluate their growth efficiency in vitro. Each clone was differentiated by two microsatellites and the gene gp45. The 18S rRNA and rap-1c genes sequences from B. bigemina biological clones and their parental strains, multiplied exclusively in vivo or in vitro, were compared with strain JG-29. The virulence of clones derived from the BbiS2P-c strain was variable. Virulent clone Bbi9P1 grew more efficiently in vitro than did the low-virulence clone Bbi2A1. The haplotypes generated by the nucleotide polymorphism, localized in the V4 region of the 18S rRNA, allowed the identification of three genotypes. The rap-1c haplotypes allowed defining four genotypes. Parental and original strains were defined by multiple haplotypes identified in both genes. The rap-1c gene, analyzed by high-resolution melting (HRM), allowed discrimination between two genotypes according to their phenotype, and both were different from JG-29. B. bigemina biological clones made it possible to define the population structure of isolates and strains. The polymorphic regions of the 18S rRNA and rap-1c genes allowed the identification of different subpopulations within original B. bigemina isolates by the definition of several haplotypes and the differentiation of fully virulent from low virulence clones.
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Affiliation(s)
- C Thompson
- Instituto Nacional de Tecnología Agropecuaria, Estación Experimental Agropecuaria Rafaela, Ruta 34 km 227, CC 22, CP 2300 Rafaela, Santa Fe, Argentina.
| | - M E Baravalle
- Instituto Nacional de Tecnología Agropecuaria, Estación Experimental Agropecuaria Rafaela, Ruta 34 km 227, CC 22, CP 2300 Rafaela, Santa Fe, Argentina
| | - B Valentini
- Instituto Nacional de Tecnología Agropecuaria, Estación Experimental Agropecuaria Rafaela, Ruta 34 km 227, CC 22, CP 2300 Rafaela, Santa Fe, Argentina
| | - A Mangold
- Instituto Nacional de Tecnología Agropecuaria, Estación Experimental Agropecuaria Rafaela, Ruta 34 km 227, CC 22, CP 2300 Rafaela, Santa Fe, Argentina
| | - S Torioni de Echaide
- Instituto Nacional de Tecnología Agropecuaria, Estación Experimental Agropecuaria Rafaela, Ruta 34 km 227, CC 22, CP 2300 Rafaela, Santa Fe, Argentina
| | - P Ruybal
- Instituto Nacional de Tecnología Agropecuaria, Centro Nacional de Investigaciones Agropecuarias Castelar, Los Reseros y Las Cabañas, CP 1712 Castelar, Buenos Aires, Argentina
| | - M Farber
- Instituto Nacional de Tecnología Agropecuaria, Centro Nacional de Investigaciones Agropecuarias Castelar, Los Reseros y Las Cabañas, CP 1712 Castelar, Buenos Aires, Argentina
| | - I Echaide
- Instituto Nacional de Tecnología Agropecuaria, Estación Experimental Agropecuaria Rafaela, Ruta 34 km 227, CC 22, CP 2300 Rafaela, Santa Fe, Argentina
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