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Capanema NSV, Mansur AAP, Carvalho SM, Martins T, Gonçalves MS, Andrade RS, Dorneles EMS, Lima LCD, de Alvarenga ÉLFC, da Fonseca EVB, de Sá MA, Lage AP, Lobato ZIP, Mansur HS. Nanosilver-Functionalized Hybrid Hydrogels of Carboxymethyl Cellulose/Poly(Vinyl Alcohol) with Antibacterial Activity for Prevention and Therapy of Infections of Diabetic Chronic Wounds. Polymers (Basel) 2023; 15:4542. [PMID: 38231902 PMCID: PMC10708083 DOI: 10.3390/polym15234542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 11/09/2023] [Accepted: 11/22/2023] [Indexed: 01/19/2024] Open
Abstract
Diabetic foot ulcers (DFUs) are considered one of the most severe chronic complications of diabetes and can lead to amputation in severe cases. In addition, bacterial infections in diabetic chronic wounds aggravate this scenario by threatening human health. Wound dressings made of polymer matrices with embedded metal nanoparticles can inhibit microorganism growth and promote wound healing, although the current clinical treatments for diabetic chronic wounds remain unsatisfactory. In this view, this research reports the synthesis and characterization of innovative hybrid hydrogels made of carboxymethyl cellulose (CMC) and poly(vinyl alcohol) (PVA) chemically crosslinked by citric acid (CA) functionalized with silver nanoparticles (AgNPs) generated in situ using an eco-friendly aqueous process. The results assessed through comprehensive in vitro and in vivo assays demonstrated that these hybrid polymer hydrogels functionalized with AgNPs possess physicochemical properties, cytocompatibility, hemocompatibility, bioadhesion, antibacterial activity, and biocompatibility suitable for wound dressings to support chronic wound healing process as well as preventing and treating bacterial infections. Hence, it can be envisioned that, with further research and development, these polymer-based hybrid nanoplatforms hold great potential as an important tool for creating a new generation of smart dressings for treating chronic diabetic wounds and opportunistic bacterial infections.
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Affiliation(s)
- Nádia S. V. Capanema
- Center of Nanoscience, Nanotechnology, and Innovation—CeNanoI, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais, UFMG, Belo Horizonte 31270-901, Brazil; (N.S.V.C.); (A.A.P.M.); (S.M.C.); (T.M.)
| | - Alexandra A. P. Mansur
- Center of Nanoscience, Nanotechnology, and Innovation—CeNanoI, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais, UFMG, Belo Horizonte 31270-901, Brazil; (N.S.V.C.); (A.A.P.M.); (S.M.C.); (T.M.)
| | - Sandhra M. Carvalho
- Center of Nanoscience, Nanotechnology, and Innovation—CeNanoI, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais, UFMG, Belo Horizonte 31270-901, Brazil; (N.S.V.C.); (A.A.P.M.); (S.M.C.); (T.M.)
| | - Talita Martins
- Center of Nanoscience, Nanotechnology, and Innovation—CeNanoI, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais, UFMG, Belo Horizonte 31270-901, Brazil; (N.S.V.C.); (A.A.P.M.); (S.M.C.); (T.M.)
| | - Maysa S. Gonçalves
- Departamento de Medicina Veterinária, Universidade Federal de Lavras, UFLA, Lavras 37200-000, Brazil; (M.S.G.); (R.S.A.); (E.M.S.D.)
| | - Rafaella S. Andrade
- Departamento de Medicina Veterinária, Universidade Federal de Lavras, UFLA, Lavras 37200-000, Brazil; (M.S.G.); (R.S.A.); (E.M.S.D.)
| | - Elaine M. S. Dorneles
- Departamento de Medicina Veterinária, Universidade Federal de Lavras, UFLA, Lavras 37200-000, Brazil; (M.S.G.); (R.S.A.); (E.M.S.D.)
| | - Letícia C. D. Lima
- Department of Morphology, Institute of Biological Sciences, Federal University of Minas Gerais, UFMG, Belo Horizonte 31270-901, Brazil; (L.C.D.L.); (M.A.d.S.)
| | - Érika L. F. C. de Alvarenga
- Department of Natural Sciences, Universidade Federal de São João Del-Rei, UFSJ, São João Del-Rei 36301-160, Brazil; (É.L.F.C.d.A.); (E.V.B.d.F.)
| | - Emanuel V. B. da Fonseca
- Department of Natural Sciences, Universidade Federal de São João Del-Rei, UFSJ, São João Del-Rei 36301-160, Brazil; (É.L.F.C.d.A.); (E.V.B.d.F.)
| | - Marcos Augusto de Sá
- Department of Morphology, Institute of Biological Sciences, Federal University of Minas Gerais, UFMG, Belo Horizonte 31270-901, Brazil; (L.C.D.L.); (M.A.d.S.)
| | - Andrey P. Lage
- Departamento de Medicina Veterinária Preventiva, Federal University of Minas Gerais, UFMG, Belo Horizonte 31270-901, Brazil; (A.P.L.); (Z.I.P.L.)
| | - Zelia I. P. Lobato
- Departamento de Medicina Veterinária Preventiva, Federal University of Minas Gerais, UFMG, Belo Horizonte 31270-901, Brazil; (A.P.L.); (Z.I.P.L.)
| | - Herman S. Mansur
- Center of Nanoscience, Nanotechnology, and Innovation—CeNanoI, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais, UFMG, Belo Horizonte 31270-901, Brazil; (N.S.V.C.); (A.A.P.M.); (S.M.C.); (T.M.)
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Mansur AAP, Carvalho SC, Dorneles EMS, Lage AP, Lobato ZIP, Mansur HS. Bio-functionalized nanocolloids of ZnS quantum dot/amine-rich polypeptides for bioimaging cancer cells with antibacterial activity: " seeing is believing". RSC Adv 2023; 13:34378-34390. [PMID: 38024978 PMCID: PMC10665648 DOI: 10.1039/d3ra06711d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2023] [Accepted: 11/19/2023] [Indexed: 12/01/2023] Open
Abstract
Among almost 200 types of cancers, glioma is considered one of the most common forms of malignant tumors located in the central nervous system (CNS). Glioblastoma (GBM), one of the deadliest types of brain cancer, remains one of the challenges faced by oncologists. Thus, smartly designed nanomaterials biofunctionalized with polypeptides can offer disruptive strategies relying on the earliest possible diagnosis ("seeing is believing") combined with more efficient therapies for fighting cancer cells. To worsen this scenario, bacteria infections very often pose a serious challenge to cancer-immunodeficient patients under chemotherapy. Thus, in this research, we report for the first time the design and synthesis of novel nanoconjugates composed of photoluminescent ZnS quantum dots (ZnS QDs), which were directly surface biofunctionalized with epsilon-poly-l-lysine (εPL), acting as an amine-rich cell-penetrating peptide (CPP) and antimicrobial peptide agent (AMP). These nanoconjugates (named ZnS@CPP-AMP) were produced through a one-step facile, eco-friendly, and biocompatible colloidal aqueous process to be applied as a proof of concept as nanoprobes for bioimaging GBM cancer cells (U87-MG) associated with synergic antibacterial activity. They were characterized regarding their physicochemical and optical properties associated with the biological activity. The results demonstrated that chemically stable aqueous colloidal nanoconjugates were effectively formed, resembling core-shell (inorganic, ZnS, organic, εPL) nanostructures with positively surface-charged features due to the cationic nature of the amine-rich polypeptide. More importantly, they demonstrated photoluminescent activity, cytocompatibility in vitro, and no significant intracellular reactive oxygen species (ROS) generation. These ZnS@CPP-AMP nanocolloids behaved as fluorescent nanoprobes for bioimaging GBM cancer cells, where the polycationic nature of the εPL biomolecule may have enhanced the cellular uptake. Additionally, they displayed mild antibacterial growth inhibition due to electrostatic interactions with bacterial membranes. Thus, it can be envisioned that these novel photoluminescent colloidal nanoconjugates offer novel nanoplatforms that can be specifically targeted with biomolecules for bioimaging to diagnose highly lethal cancers, such as GBM, and as an adjuvant in antibacterial therapy.
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Affiliation(s)
- Alexandra A P Mansur
- Department of Metallurgical and Materials Engineering, Center of Nanoscience, Nanotechnology, and Innovation-CeNano2I, Federal University of Minas Gerais, UFMG Av. Antônio Carlos, 6627 - Escola de Engenharia, Bloco 2 - Sala 2233 31.270-901 Belo Horizonte MG Brazil +55-31-34091843 +55-31-34091843
| | - Sandhra C Carvalho
- Department of Metallurgical and Materials Engineering, Center of Nanoscience, Nanotechnology, and Innovation-CeNano2I, Federal University of Minas Gerais, UFMG Av. Antônio Carlos, 6627 - Escola de Engenharia, Bloco 2 - Sala 2233 31.270-901 Belo Horizonte MG Brazil +55-31-34091843 +55-31-34091843
| | - Elaine M S Dorneles
- Departamento de Medicina Veterinária, Universidade Federal de Lavras, UFLA Brazil
| | - Andrey P Lage
- Departamento de Medicina Veterinária Preventiva, Federal University of Minas Gerais, UFMG Brazil
| | - Zelia I P Lobato
- Departamento de Medicina Veterinária Preventiva, Federal University of Minas Gerais, UFMG Brazil
| | - Herman S Mansur
- Department of Metallurgical and Materials Engineering, Center of Nanoscience, Nanotechnology, and Innovation-CeNano2I, Federal University of Minas Gerais, UFMG Av. Antônio Carlos, 6627 - Escola de Engenharia, Bloco 2 - Sala 2233 31.270-901 Belo Horizonte MG Brazil +55-31-34091843 +55-31-34091843
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Pereira CR, Neia RC, Silva SB, Williamson CHD, Gillece JD, O'Callaghan D, Foster JT, Oliveira IRC, Filho JSSB, Lage AP, Azevedo VAC, Dorneles EMS. Comparison of Brucella abortus population structure based on genotyping methods with different levels of resolution. J Microbiol Methods 2023:106772. [PMID: 37343840 DOI: 10.1016/j.mimet.2023.106772] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 06/18/2023] [Accepted: 06/18/2023] [Indexed: 06/23/2023]
Abstract
Numerous genotyping techniques based on different principles and with different costs and levels of resolution are currently available for understanding the transmission dynamics of brucellosis worldwide. We aimed to compare the population structure of the genomes of 53 Brazilian Brucella abortus isolates using eight different genotyping methods: multiple-locus variable-number tandem-repeat analysis (MLVA8, MLVA11, MLVA16), multilocus sequence typing (MLST9, MLST21), core genome MLST (cgMLST) and two techniques based on single nucleotide polymorphism (SNP) detection (parSNP and NASP) from whole genomes. The strains were isolated from six different Brazilian states between 1977 and 2008 and had previously been analyzed using MLVA8, MLVA11, and MLVA16. Their whole genomes were sequenced, assembled, and subjected to MSLT9 MLST21, cgMLST, and SNP analyses. All the genotypes were compared by hierarchical grouping method based on the average distances between the correlation matrices of each technique. MLST9 and MLST21 had the lowest level of resolution, both revealing only four genotypes. MLVA8, MLVA11, and MLVA16 had progressively increasing levels of resolution as more loci were analyzed, identifying 6, 16, and 44 genotypes, respectively. cgMLST showed the highest level of resolution, identifying 45 genotypes, followed by the SNP-based methods, both of which had 44 genotypes. In the assessed population, MLVA was more discriminatory than MLST and was easier and cheaper to perform. SNP techniques and cgMLST provided the highest levels of resolution and the results from the two methods were in close agreement. In conclusion, the choice of genotyping technique can strongly affect one's ability to make meaningful epidemiological conclusions but is dependent on available resources: while the VNTR based techniques are more indicated to high prevalence scenarios, the WGS methods are the ones with the best discriminative power and therefore recommended for outbreaks investigation.
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Affiliation(s)
- Carine R Pereira
- Faculdade de Zootecnia e Medicina Veterinária, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil
| | - Raquel C Neia
- Faculdade de Ciências Básicas, Universidade Federal Fluminense, Nova Friburgo, Rio de Janeiro, Brazil
| | - Saulo B Silva
- Escola de Ciências da Saúde, Univali, Itajaí, Santa Catarina, Brazil
| | | | - John D Gillece
- Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, USA
| | - David O'Callaghan
- Bacterial Virulence and Infectious Disease, University of Montpellier, Nimes, France
| | - Jeffrey T Foster
- Pathogen and Microbiome Institute, Northern Arizona University, Flagstaff, AZ, USA
| | - Izabela R C Oliveira
- Departamento de Estatística, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil
| | - Júlio S S B Filho
- Departamento de Estatística, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil
| | - Andrey P Lage
- Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Vasco A C Azevedo
- Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Elaine M S Dorneles
- Faculdade de Zootecnia e Medicina Veterinária, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil.
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Mansur AAP, Custódio DAC, Dorneles EMS, Coura FM, Carvalho IC, Lage AP, Mansur HS. Nanoplexes of ZnS quantum dot-poly-l-lysine/iron oxide nanoparticle-carboxymethylcellulose for photocatalytic degradation of dyes and antibacterial activity in wastewater treatment. Int J Biol Macromol 2023; 231:123363. [PMID: 36690232 DOI: 10.1016/j.ijbiomac.2023.123363] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2022] [Revised: 01/10/2023] [Accepted: 01/17/2023] [Indexed: 01/22/2023]
Abstract
The contamination and pollution of wastewater with a wide diversity of chemical, microbiological, and hazardous substances is a field of raising environmental concern. In this study, we developed, for the first time, new hybrid multifunctional nanoplexes composed of ZnS semiconductor quantum dots (ZnS QDs) chemically biofunctionalized with epsilon-poly-l-lysine (ɛPL) and coupled with magnetic iron oxide nanoparticles (MION, Fe3O4) stabilized by carboxymethylcellulose (CMC) for the photodegradation (ZnS) of organic molecules and antibacterial activity (ɛPL) with a potential of recovery by an external magnetic field (Fe3O4). These nanosystems, which were synthesized entirely through a green aqueous process, were comprehensively characterized regarding their physicochemical properties combined with spectroscopic and morphological features. The results demonstrated that supramolecular colloidal nanoplexes were formed owing to the strong cationic/anionic electrostatic interactions between the biomacromolecule capping ligands of the two nanoconjugates (i.e., polypeptide in ZnS@ɛPL and polysaccharide in Fe3O4@CMC). Moreover, these nanosystems showed photocatalytic degradation of methylene blue (MB) used as a model dye pollutant in water. Besides MB, methyl orange, congo red, and rhodamine dyes were also tested for selectivity investigation of the photodegradation by the nanoplexes. The antibacterial activity ascribed to the ɛPL biomolecule was confirmed against Gram-positive and Gram-negative bacteria, including drug-resistance field strains. Hence, it is envisioned that these novel green nanoplexes offer a new avenue of alternatives to be employed for reducing organic pollutants and inactivating pathogenic bacteria in water and wastewater treatment, benefiting from easy magnetic recovery.
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Affiliation(s)
- Alexandra A P Mansur
- Center of Nanoscience, Nanotechnology, and Innovation - CeNano(2)I, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais, UFMG, Brazil
| | - Dircéia A C Custódio
- Departamento de Medicina Veterinária, Universidade Federal de Lavras, UFLA, Brazil
| | - Elaine M S Dorneles
- Departamento de Medicina Veterinária, Universidade Federal de Lavras, UFLA, Brazil
| | - Fernanda M Coura
- Instituto Federal de Educação, Ciência e Tecnologia de Minas Gerais - Campus Bambuí, IFMG, Brazil
| | - Isadora C Carvalho
- Center of Nanoscience, Nanotechnology, and Innovation - CeNano(2)I, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais, UFMG, Brazil
| | - Andrey P Lage
- Departamento de Medicina Veterinária Preventiva, Federal University of Minas Gerais, UFMG, Brazil
| | - Herman S Mansur
- Center of Nanoscience, Nanotechnology, and Innovation - CeNano(2)I, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais, UFMG, Brazil.
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Santos RGD, Seyffert N, Dorneles EMS, Aguiar ERGR, Ramos CP, Haas DJ, Assis GBN, Portela RD, Goes-Neto A, Pacheco LGC, Figueiredo HCP, Sousa TDJ, Tiwari S, Jaiswal AK, Lage AP, Castro TLP, Azevedo V. Exploring the MALDI Biotyper for the Identification of Corynebacterium pseudotuberculosis biovar Ovis and Equi. J Am Soc Mass Spectrom 2022; 33:2055-2062. [PMID: 36239433 DOI: 10.1021/jasms.2c00174] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Biochemical, serological, and molecular methods have been developed for the laboratory diagnosis of diseases caused by C. pseudotuberculosis (CP), but the identification of the pathogen and biovars differentiation may be time-consuming, expensive, and confusing compared with other bacteria. This study aimed to evaluate MALDI Biotyper and Overall Genome Relatedness Index (OGRI) analysis to optimize the identification and differentiation of biovars of C. pseudotuberculosis. Out of 230 strains isolated from several hosts and countries, 202 (87.8%) were precisely classified using MALDI Biotyper and the BioNumerics platform. The classification accuracies for the Ovis and Equi biovars were 80 (88.75%) and 82 (92.68%), respectively. When analyzing a sampling of these strains by Average Nucleotide Identity based on BLAST and TETRA analyses using genomic sequence data, it was possible to differentiate 100% of the strains in Equi and Ovis. Our data show that MALDI Biotyper and OGRI analysis help identify C. pseudotuberculosis at the species and biovar levels.
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Affiliation(s)
| | - Nubia Seyffert
- Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil
- Instituto de Ciências da Saúde, Universidade Federal da Bahia, Salvador 40231-300, Brazil
| | - Elaine M S Dorneles
- Departamento de Medicina Veterinária, Universidade Federal de Lavras, Lavras 37200-000, Brazil
| | - Eric R G R Aguiar
- Centro de Biotecnologia e Genética, Universidade Estadual de Santa Cruz, Ilhéus 45662-900, Brazil
| | - Carolina P Ramos
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil
| | - Dionei J Haas
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil
| | - Gabriella B N Assis
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil
| | - Ricardo Dias Portela
- Instituto de Ciências da Saúde, Universidade Federal da Bahia, Salvador 40231-300, Brazil
| | - Aristóteles Goes-Neto
- Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil
| | - Luis G C Pacheco
- Instituto de Ciências da Saúde, Universidade Federal da Bahia, Salvador 40231-300, Brazil
| | - Henrique C P Figueiredo
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil
| | - Thiago de Jesus Sousa
- Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil
| | - Sandeep Tiwari
- Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil
| | - Arun Kumar Jaiswal
- Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil
| | - Andrey P Lage
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil
| | - Thiago L P Castro
- Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil
- Instituto de Ciências da Saúde, Universidade Federal da Bahia, Salvador 40231-300, Brazil
| | - Vasco Azevedo
- Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil
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Diniz Neto HC, Lombardi MC, Campos MM, Lage AP, Silva ROS, Dorneles EMS, Lage CFA, Carvalho WA, Machado FS, Pereira LGR, Tomich TR, Ramos CP, Assis RA, Lobato FCF, Santana JA, Santos ELS, Andrade RS, Coelho SG. Effects of vaccination against brucellosis and clostridia on the intake, performance, feeding behavior, blood parameters, and immune responses of dairy heifers calves. J Anim Sci 2021; 99:6211303. [PMID: 33822982 DOI: 10.1093/jas/skab107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2020] [Accepted: 03/31/2021] [Indexed: 11/13/2022] Open
Abstract
The aim of this study was to identify possible effects of different vaccination strategies (concomitantly or not) against brucellosis and clostridia on intake, performance, feeding behavior, blood parameters, and immune responses of dairy heifers calves. Fifty heifers calves were enrolled [38 Gyr (Zebu, Bos taurus indicus) and 12 5/8 Holstein × Gyr]. At 120 d of age, animals were randomly distributed among 3 groups: B (n = 18), vaccinated against brucellosis; C (n = 14), vaccinated against clostridia and CB (n = 18), vaccinated concomitantly for both. Rectal and thermographic temperatures were evaluated on days -1, 0, 1, 2, 3, 5, 7,10, 14, and 28 relatives to the vaccination day. Feed and water intake, body weight (BW), and feeding behavior were monitored daily by an electronic feeding system. Blood was sampled on days 0, 3, 7, 14, and 28, relative to the vaccination day for determination of glucose and β -hydroxybutyrate (BHBA) concentrations. Blood sampled on day 0 (prevaccination) and on days 28 and 42 were used to evaluate the immune response against Brucella abortus and clostridia. There was an increase in rectal temperature between the first and the third day postvaccination in the 3 groups. The thermography revealed an increase of local temperature for 7 d on groups B and CB. Group C had increased local temperature for a longer period, lasting for up to 14 d. Dry mater intake was reduced for groups B and CB, but no alteration was observed for group C. No alterations regarding initial BW, final BW, average daily weight gain, and feed efficiency were observed. No differences were observed for the 3 vaccination groups for blood parameters throughout the evaluation period. The concomitant vaccination against brucellosis and clostridia led to lower neutralizing antibody titers against epsilon toxin of Clostridium perfringens and botulinum toxin type C of C. botulinum (C > CB > B). When cellular proliferation assay and serological tests to B. abortus were evaluated, no differences were observed between groups B and CB. The present results indicate that the concomitant vaccination against brucellosis and clostridia has no relevant impact on the intake, performance, and feeding behavior of dairy calves. However, the concomitant vaccination of vaccines against these 2 pathogens impacts animal immunity against clostridial infections.
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Affiliation(s)
- Hilton C Diniz Neto
- Departamento de Zootecnia, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais 30161-970, Brazil
| | - Mayara C Lombardi
- Departamento de Zootecnia, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais 30161-970, Brazil
| | - Mariana M Campos
- Empresa Brasileira de Pesquisa Agropecuária - Embrapa Gado de Leite, Juiz de Fora, Minas Gerais, 36038-330, Brazil
| | - Andrey P Lage
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 30161-970, Brazil
| | - Rodrigo O S Silva
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 30161-970, Brazil
| | - Elaine Maria Seles Dorneles
- Departamento de Medicina Veterinária, Universidade Federal de Lavras, Lavras, Minas Gerais, 30161-970, Brazil
| | - Camila Flávia A Lage
- Departamento de Zootecnia, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais 30161-970, Brazil
| | - Wanessa A Carvalho
- Empresa Brasileira de Pesquisa Agropecuária - Embrapa Gado de Leite, Juiz de Fora, Minas Gerais, 36038-330, Brazil
| | - Fernanda S Machado
- Empresa Brasileira de Pesquisa Agropecuária - Embrapa Gado de Leite, Juiz de Fora, Minas Gerais, 36038-330, Brazil
| | - Luiz Gustavo R Pereira
- Empresa Brasileira de Pesquisa Agropecuária - Embrapa Gado de Leite, Juiz de Fora, Minas Gerais, 36038-330, Brazil
| | - Thierry R Tomich
- Empresa Brasileira de Pesquisa Agropecuária - Embrapa Gado de Leite, Juiz de Fora, Minas Gerais, 36038-330, Brazil
| | - Carolina P Ramos
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 30161-970, Brazil
| | - Ronnie A Assis
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 30161-970, Brazil
| | - Francisco Carlos F Lobato
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 30161-970, Brazil
| | - Jordana A Santana
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 30161-970, Brazil
| | - Ethiene Luiza S Santos
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, 30161-970, Brazil
| | - Rafaella S Andrade
- Departamento de Medicina Veterinária, Universidade Federal de Lavras, Lavras, Minas Gerais, 30161-970, Brazil
| | - Sandra G Coelho
- Departamento de Zootecnia, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais 30161-970, Brazil
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Carvalho IC, Medeiros Borsagli FGL, Mansur AAP, Caldeira CL, Haas DJ, Lage AP, Ciminelli VST, Mansur HS. 3D sponges of chemically functionalized chitosan for potential environmental pollution remediation: biosorbents for anionic dye adsorption and 'antibiotic-free' antibacterial activity. Environ Technol 2021; 42:2046-2066. [PMID: 31743650 DOI: 10.1080/09593330.2019.1689302] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Accepted: 10/31/2019] [Indexed: 06/10/2023]
Abstract
In this work, it was developed three-dimensional (3D) porous hydrogel sponges produced by the freeze-dried process using chitosan polymer functionalized by 11-mercaptoundecanoic acid (MUA). These chitosan-based sponges were used as cationic adsorbents for the removal of anionic methyl orange (MO) dye, simulating a model organic pollutant in aqueous medium. Moreover, these porous 3D constructs were also evaluated as 'antibiotic-free' antibacterial materials against gram-negative and gram-positive bacteria, Pseudomonas aeruginosa and Staphylococcus aureus, respectively, which were used as model pathogens possibly found in contaminated hospital discharges. These 3D hydrogels were comprehensively characterized through morphological methods such as scanning electron microscopy and X-ray micro-computed tomography techniques, combined with FTIR, Raman, and UV-visible spectroscopy analyses. Additionally, the surface area, the degree of swelling, and the adsorption profiles and kinetics of these scaffolds were systematically investigated. The chemically thiolated chitosan (CHI-MUA) hydrogels were successfully produced with a supramolecular polymeric network based on hydrogen bonds, disulfide bonds, and hydrophobic interactions that resulted in higher stability in aqueous medium than hydrogels of pristine chitosan. CHI-MUA exhibited sponge-like three-dimensional structures, with highly interconnected and hierarchical pore size distribution with high porosity and surface area. These architectural aspects of the 3D sponges favoured the high adsorption capacity for MO dye (∼388 mg.g-1) in water with removal efficiency greater than 90% for MO solutions (from 20 mg.L-1-1200 mg.L-1). The adsorption data followed a pseudo-second-order kinetic model and adsorption isotherm analysis and spectroscopy studies suggested a multilayer behaviour with coexistence of adsorbent-adsorbate and adsorbate-adsorbate interactions. Additionally, the in vitro evaluation of toxicity (MTT and LIVE-DEAD® assays) of 3D-sponges revealed a non-toxic response and preliminary suitability for bio-related applications. Importantly, the 3D-sponges composed of chitosan-thiolated derivative proved high antibacterial activity, specificity against P. aeruginosa (model hazardous pathogen), equivalent to conventional antibiotic drugs, while no lethality against S. aureus (reference commensal bacteria) was observed.
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Affiliation(s)
- Isadora C Carvalho
- Center of Nanoscience, Nanotechnology, and Innovation - CeNano2I, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais/UFMG, Belo Horizonte, Brazil
| | - Fernanda G L Medeiros Borsagli
- Center of Nanoscience, Nanotechnology, and Innovation - CeNano2I, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais/UFMG, Belo Horizonte, Brazil
| | - Alexandra A P Mansur
- Center of Nanoscience, Nanotechnology, and Innovation - CeNano2I, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais/UFMG, Belo Horizonte, Brazil
| | - Cláudia L Caldeira
- National Institutes of Science and Technology: INCT-Acqua, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Dionei J Haas
- Department of Preventive Veterinary Medicine, Veterinary School, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Andrey P Lage
- Department of Preventive Veterinary Medicine, Veterinary School, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Virginia S T Ciminelli
- National Institutes of Science and Technology: INCT-Acqua, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - Herman S Mansur
- Center of Nanoscience, Nanotechnology, and Innovation - CeNano2I, Department of Metallurgical and Materials Engineering, Federal University of Minas Gerais/UFMG, Belo Horizonte, Brazil
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8
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Cunha AF, Andrade HM, Souza FN, Fialho Júnior LC, Rosa DLSO, Ramos Sanchez EM, Gidlund M, Goto H, Brito MAVP, Guimarães AS, Lage AP, Reis LC, Della Libera AMMP, Heinemann MB, Cerqueira MMOP. Comparison of antibody repertories against Staphylococcus aureus in healthy and infected dairy cows with a distinct mastitis history and vaccinated with a polyvalent mastitis vaccine. J Dairy Sci 2020; 103:4588-4605. [PMID: 32113759 DOI: 10.3168/jds.2019-17084] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2019] [Accepted: 11/25/2019] [Indexed: 12/22/2022]
Abstract
Staphylococcus aureus is one of the pathogens most frequently isolated from cases of mastitis worldwide. To decrease the effect of S. aureus mastitis in dairy farming, alternative strategies for controlling mastitis are needed that depend on a better knowledge of cow-to-cow variations in S. aureus antibody production. The present study sought to explore the diversity of S. aureus antibodies produced by dairy cows with a distinct mastitis history and vaccinated with a polyvalent mastitis vaccine. We obtained protein extracts from S. aureus isolates derived from persistent subclinical mastitis. Proteins were fractionated using 2-dimensional gel electrophoresis and Western blotting. Then, Western blotting membranes were exposed to sera from 24 dairy cows that had been divided into the following groups: vaccinated dairy cows that were infected with S. aureus, further subdivided according to whether they (a) remained infected by S. aureus or (b) recovered from the intramammary infection; unvaccinated dairy cows infected with S. aureus; and vaccinated healthy dairy cows with no history of S. aureus mastitis. Proteins found to be reactive by Western blot were identified by mass spectrometry (MALDI/TOF-TOF). Our most important finding was that F0F1 ATP synthase subunit α, succinyl-diaminopimelate desuccinylase, and cysteinyl-tRNA synthetase were potential candidate proteins for the prevention of S. aureus mastitis. This study strengthens the notion that variations among animals should not be ignored and shows that the heterogeneity of antibody production against anti-staphylococcal antigens in animals may enable the identification of new immunotherapy targets.
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Affiliation(s)
- A F Cunha
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte 31270-010, Brazil; Departamento de Tecnologia e Inspeção de Produtos de Origem Animal, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte 31270-010, Brazil.
| | - H M Andrade
- Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil
| | - F N Souza
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte 31270-010, Brazil; Departamento de Tecnologia e Inspeção de Produtos de Origem Animal, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte 31270-010, Brazil; Veterinary Clinical Immunology Research Group, Departamento de Clínica Médica, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo 05508-270, Brazil; Programa de Pós-graduação em Ciência Animal, Universidade Federal da Paraíba, Areia 58397-000, Brazil
| | - L C Fialho Júnior
- Departamento de Parasitologia, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte 31270-901, Brazil
| | - D L S O Rosa
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte 31270-010, Brazil; Departamento de Tecnologia e Inspeção de Produtos de Origem Animal, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte 31270-010, Brazil
| | - E M Ramos Sanchez
- Laboratório de Sorologia e Imunobiologia, Instituto de Medicina Tropical, Universidade de São Paulo, São Paulo 05403-000, Brazil; Departamento de Salud Publica, Facultad de Ciencias de La Salud, Universidad Nacional Toribio Rodriguez de Mendoza de Amazonas, Chachapoyas 01000, Peru
| | - M Gidlund
- Departamento de Imunologia, Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo 05508-900, Brazil
| | - H Goto
- Laboratório de Sorologia e Imunobiologia, Instituto de Medicina Tropical, Universidade de São Paulo, São Paulo 05403-000, Brazil
| | - M A V P Brito
- EMBRAPA-Gado de Leite, Avenida Eugênio do Nascimento, 610, Juiz de Fora 36038-330, Brazil
| | - A S Guimarães
- Departamento de Medicina Veterinária, Universidade Federal de Lavras, Lavras 37200-000, Brazil
| | - A P Lage
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte 31270-010, Brazil
| | - L C Reis
- Laboratório de Sorologia e Imunobiologia, Instituto de Medicina Tropical, Universidade de São Paulo, São Paulo 05403-000, Brazil
| | - A M M P Della Libera
- Veterinary Clinical Immunology Research Group, Departamento de Clínica Médica, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo 05508-270, Brazil
| | - M B Heinemann
- Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo 05508-270, Brazil
| | - M M O P Cerqueira
- Departamento de Tecnologia e Inspeção de Produtos de Origem Animal, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte 31270-010, Brazil
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9
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Oliveira Júnior CA, Silva ROS, Lage AP, Coura FM, Ramos CP, Alfieri AA, Guedes RMC, Lobato FCF. Non-toxigenic strain of Clostridioides difficile Z31 reduces the occurrence of C. difficile infection (CDI) in one-day-old piglets on a commercial pig farm. Vet Microbiol 2019; 231:1-6. [PMID: 30955794 DOI: 10.1016/j.vetmic.2019.02.026] [Citation(s) in RCA: 3] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2018] [Revised: 02/11/2019] [Accepted: 02/19/2019] [Indexed: 01/09/2023]
Abstract
Neonatal porcine diarrhea (NPD) is a current problem on pig farms and is caused by several enteropathogens. Among them, Clostridioides difficile stands out due to its importance in piglets and zoonotic potential. A non-toxigenic strain of C. difficile (NTCD), named Z31, was previously tested in hamster and piglet experimental models as a strategy to prevent C. difficile infection (CDI). To evaluate the capacity of the strain Z31 to prevent CDI and NPD in one-day-old piglets on a commercial farm, 90 piglets from 16 litters received 1 × 106 spores of Z31 while 84 animals from the same litters served as controls. Animals were clinically evaluated, and fecal samples were collected 24 h after administration and submitted to A/B toxin detection and isolation of C. difficile. Stool samples were also submitted to rotavirus, Escherichia coli, and Clostridium perfringens detection. Administration of Z31 reduced the incidence of CDI in treated animals (7.8%) when compared to the control group (25.0%; P = 0.003). In animals that developed CDI, the intensity of diarrhea was lower in those that received Z31 than in the control group. Neonatal porcine diarrhea was reduced in treated animals when compared to untreated animals (P < 0.001). The present study suggests that Z31 can potentially be used to prevent CDI in piglets on commercial farms.
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Affiliation(s)
- C A Oliveira Júnior
- Veterinary School, Universidade Federal de Minas Gerais (UFMG), Av. Antônio Carlos, 6627, Belo Horizonte, MG, CEP 31.270-901, Brazil
| | - R O S Silva
- Veterinary School, Universidade Federal de Minas Gerais (UFMG), Av. Antônio Carlos, 6627, Belo Horizonte, MG, CEP 31.270-901, Brazil.
| | - A P Lage
- Veterinary School, Universidade Federal de Minas Gerais (UFMG), Av. Antônio Carlos, 6627, Belo Horizonte, MG, CEP 31.270-901, Brazil
| | - F M Coura
- Veterinary School, Universidade Federal de Minas Gerais (UFMG), Av. Antônio Carlos, 6627, Belo Horizonte, MG, CEP 31.270-901, Brazil
| | - C P Ramos
- Veterinary School, Universidade Federal de Minas Gerais (UFMG), Av. Antônio Carlos, 6627, Belo Horizonte, MG, CEP 31.270-901, Brazil
| | - A A Alfieri
- Universidade Estadual de Londrina (UEL), Rodovia Celso Garcia Cid, PR 445, Km 380, Campus Universitário, Londrina, PR, CEP 86.057-970, Brazil
| | - R M C Guedes
- Veterinary School, Universidade Federal de Minas Gerais (UFMG), Av. Antônio Carlos, 6627, Belo Horizonte, MG, CEP 31.270-901, Brazil
| | - F C F Lobato
- Veterinary School, Universidade Federal de Minas Gerais (UFMG), Av. Antônio Carlos, 6627, Belo Horizonte, MG, CEP 31.270-901, Brazil
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10
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Dorneles EMS, Fonseca MDAM, Abreu JAP, Lage AP, Brito MAVP, Pereira CR, Brandão HM, Guimarães AS, Heinemann MB. Genetic diversity and antimicrobial resistance in Staphylococcus aureus and coagulase-negative Staphylococcus isolates from bovine mastitis in Minas Gerais, Brazil. Microbiologyopen 2018; 8:e00736. [PMID: 30298561 PMCID: PMC6528566 DOI: 10.1002/mbo3.736] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2018] [Revised: 08/10/2018] [Accepted: 08/20/2018] [Indexed: 12/02/2022] Open
Abstract
The aims of this study were to determine the antimicrobial susceptibility profile and genetic diversity of Staphylococcus spp. isolated from dairy cows in Minas Gerais, Brazil, and to assess the relationship among the isolates’ susceptibility profiles and pulsed‐field gel electrophoresis (PFGE) genotypes. Seventy‐nine isolates were used, including S. aureus (n = 71) and coagulase‐negative staphylococci (CoNS) (n = 8). Susceptibility to 12 antimicrobial agents was performed. All Staphylococcus spp. were subjected to PFGE. Staphylococcus aureus and CoNS isolates exhibited full susceptibility only to cephalothin. The greatest percentages of resistance among Staphylococcus spp. were observed to penicillins, folate pathway inhibitors, and tetracyclines. Twelve S. aureus and four CoNS were classified as multidrug resistance strains. Percentage of MRSA was also higher among CoNS (75%), compared to S. aureus isolates (2.81%). Adopting 100% of similarity, 34 different genotypes were identified. Association of minimum‐spanning tree (MST) analysis with data from municipalities, herds, methicillin‐resistant S. aureus (MRSA), and resistance patterns for all isolates did not show any clustering. However, a clustering pattern of bacterial species was observed. Results from this study indicate a high frequency of antimicrobial resistance, especially among CoNS, and a high genetic diversity among Staphylococcus spp. isolated from dairy cows with mastitis in Minas Gerais, Brazil.
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Affiliation(s)
- Elaine M S Dorneles
- Departamento de Medicina Veterinária, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil
| | - Mariana D A M Fonseca
- Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, São Paulo, Brazil
| | - Juliana A P Abreu
- Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, São Paulo, Brazil
| | - Andrey P Lage
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Maria A V P Brito
- Núcleo de Saúde Animal e Qualidade do Leite, Embrapa Gado de Leite, Juiz de Fora, Minas Gerais, Brazil
| | - Carine R Pereira
- Departamento de Medicina Veterinária, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil
| | - Humberto M Brandão
- Núcleo de Saúde Animal e Qualidade do Leite, Embrapa Gado de Leite, Juiz de Fora, Minas Gerais, Brazil
| | - Alessandro S Guimarães
- Departamento de Medicina Veterinária, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil.,Núcleo de Saúde Animal e Qualidade do Leite, Embrapa Gado de Leite, Juiz de Fora, Minas Gerais, Brazil
| | - Marcos B Heinemann
- Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, São Paulo, Brazil
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11
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Castro AGSA, Dorneles EMS, Santos ELS, Alves TM, Silva GR, Figueiredo TC, Assis DCS, Lage AP, Cançado SV. Viability of Campylobacter spp. in frozen and chilled broiler carcasses according to real-time PCR with propidium monoazide pretreatment. Poult Sci 2018; 97:1706-1711. [PMID: 29471351 DOI: 10.3382/ps/pey020] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Accepted: 01/08/2018] [Indexed: 11/20/2022] Open
Abstract
The aim of this study was to evaluate the viability of Campylobacter spp. in frozen and chilled broiler carcasses using real-time PCR with propidium monoazide (PMA) pretreatment. Sixty broiler carcasses were collected: 30 frozen and 30 chilled. Each carcass was submitted to 2 real-time PCR protocols to detect and quantify Campylobacter spp.: one using pretreatment with PMA, which blocks the amplification of DNA from dead bacteria, and the other without PMA. The results showed that PMA-pretreated carcasses, either frozen or chilled, had a lower positivity rate compared to untreated samples (P < 0.001). Regarding storage temperatures, PMA-pretreated frozen carcasses that tested positive were in a lesser number than chilled carcasses (P < 0.05). However, the quantification of total and live bacteria in PMA-pretreated frozen carcasses that tested positive showed no significant difference compared to chilled carcasses. It was concluded that the real-time PCR with PMA pretreatment was a sensitive method for evaluating the viability of Campylobacter spp. in broiler carcasses. Chilled broiler carcasses would represent greater hazard to public health concerning Campylobacter transmission.
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Affiliation(s)
- Andréa G S A Castro
- Departamento de Tecnologia e Inspeção de Produtos de Origem Animal, Escola de Veterinária, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, Caixa Postal 567, 30123-970, Belo Horizonte, MG, Brazil
| | - Elaine M S Dorneles
- Departamento de Medicina Veterinária, Universidade Federal de Lavras, Av. Dr. Sylvio Menicucci 1001, Caixa Postal 3037, 37200-000, Lavras, MG, Brazil
| | - Ethiene L S Santos
- Departamento de Tecnologia e Inspeção de Produtos de Origem Animal, Escola de Veterinária, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, Caixa Postal 567, 30123-970, Belo Horizonte, MG, Brazil
| | - Telma M Alves
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, Caixa Postal 567, 30123-970, Belo Horizonte, MG, Brazil
| | - Guilherme R Silva
- Departamento de Tecnologia e Inspeção de Produtos de Origem Animal, Escola de Veterinária, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, Caixa Postal 567, 30123-970, Belo Horizonte, MG, Brazil
| | - Tadeu C Figueiredo
- Departamento de Tecnologia e Inspeção de Produtos de Origem Animal, Escola de Veterinária, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, Caixa Postal 567, 30123-970, Belo Horizonte, MG, Brazil
| | - Débora C S Assis
- Departamento de Tecnologia e Inspeção de Produtos de Origem Animal, Escola de Veterinária, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, Caixa Postal 567, 30123-970, Belo Horizonte, MG, Brazil
| | - Andrey P Lage
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, Caixa Postal 567, 30123-970, Belo Horizonte, MG, Brazil
| | - Silvana V Cançado
- Departamento de Tecnologia e Inspeção de Produtos de Origem Animal, Escola de Veterinária, Universidade Federal de Minas Gerais, Av. Antônio Carlos 6627, Caixa Postal 567, 30123-970, Belo Horizonte, MG, Brazil
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12
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Morais-Rios PAG, Alves TM, Dorneles EM, Stynen APR, Cottorello ACP, Lauria-Filgueiras AL, Lage AP. Adherence to and invasion of HeLa cells by Campylobacter spp. strains isolated from animals. Pesq Vet Bras 2018. [DOI: 10.1590/1678-5150-pvb-4999] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
ABSTRACT: The objective of this study was to evaluate the adherence to and invasion of HeLa cells by Campylobacter spp. strains (total n=63) isolated from chickens (n=4), dogs (n=4), non-human primates (n=16), pigs (n=9), calf feces (n=18), and bovine genital tracts (n=12). Thirty-two strains adhered to and 13 invaded HeLa cells. Invasive strains included 1 of 4 dog isolates, 4 of 16 non-human primate isolates (2 C. jejuni and 2 C. coli), 1 of 9 C. coli strains isolated from pigs, and 7 of 18 C. fetus subsp. fetus isolated from calf feces. Only 25% of chicken and dog isolates and 23% of pig isolates were able to adhere to HeLa cells, a property of 65% of strains obtained from calf feces and 83% of bovine genital tract-isolated strains. The adherent phenotype was observed in 5 of 19, 6 of 15, and 21 of 29 strains of C. jejuni, C. coli, and C. fetus subsp. fetus, respectively, whereas 3 of 19, 3 of 15, and 7 of 29 strains were additionally able to invade HeLa cells, respectively. C. jejuni, C. coli, and C. fetus subsp. fetus strains isolated from animal feces are able to adhere and invade HeLa cells, whereas C. fetus subsp. fetus strains isolated from the bovine genital tract were not invasive in HeLa cells. The present study showed that C. jejuni isolated from primates and dogs, C. coli isolated from non-human primates and pigs, and C. fetus subsp. fetus isolated from calf feces have the ability to adhere to and to invade HeLa cells. Moreover, the lack of invasive ability by C. fetus subsp. fetus strains isolated from the bovine genital tract could be important in the pathogenesis of the genital tract diseases caused by this bacterium.
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Affiliation(s)
| | | | | | | | - Ana Cláudia P. Cottorello
- Universidade Federal de Minas Gerais, Brazil; Ministério da Agricultura, Pecuária e Abastecimento, Brazil
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13
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Capanema NSV, Mansur AAP, Carvalho SM, Mansur LL, Ramos CP, Lage AP, Mansur HS. Physicochemical properties and antimicrobial activity of biocompatible carboxymethylcellulose-silver nanoparticle hybrids for wound dressing and epidermal repair. J Appl Polym Sci 2017. [DOI: 10.1002/app.45812] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Nádia S. V. Capanema
- Center of Nanoscience, Nanotechnology and Innovation-CeNano I, Department of Metallurgical and Materials Engineering; Federal University of Minas Gerais/UFMG, Av. Antônio Carlos, 6627-Escola de Engenharia, Bloco 2-Sala 2233, 31.270-901; Belo Horizonte MG Brazil
| | - Alexandra A. P. Mansur
- Center of Nanoscience, Nanotechnology and Innovation-CeNano I, Department of Metallurgical and Materials Engineering; Federal University of Minas Gerais/UFMG, Av. Antônio Carlos, 6627-Escola de Engenharia, Bloco 2-Sala 2233, 31.270-901; Belo Horizonte MG Brazil
| | - Sandhra M. Carvalho
- Center of Nanoscience, Nanotechnology and Innovation-CeNano I, Department of Metallurgical and Materials Engineering; Federal University of Minas Gerais/UFMG, Av. Antônio Carlos, 6627-Escola de Engenharia, Bloco 2-Sala 2233, 31.270-901; Belo Horizonte MG Brazil
| | - Lorena L. Mansur
- Center of Nanoscience, Nanotechnology and Innovation-CeNano I, Department of Metallurgical and Materials Engineering; Federal University of Minas Gerais/UFMG, Av. Antônio Carlos, 6627-Escola de Engenharia, Bloco 2-Sala 2233, 31.270-901; Belo Horizonte MG Brazil
| | - Carolina P. Ramos
- Laboratório de Bacteriologia Aplicada, Departamento de Medicina Veterinária Preventiva; Escola de Veterinária, UFMG; Belo Horizonte MG Brazil
| | - Andrey P. Lage
- Laboratório de Bacteriologia Aplicada, Departamento de Medicina Veterinária Preventiva; Escola de Veterinária, UFMG; Belo Horizonte MG Brazil
| | - Herman S. Mansur
- Center of Nanoscience, Nanotechnology and Innovation-CeNano I, Department of Metallurgical and Materials Engineering; Federal University of Minas Gerais/UFMG, Av. Antônio Carlos, 6627-Escola de Engenharia, Bloco 2-Sala 2233, 31.270-901; Belo Horizonte MG Brazil
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14
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Almeida S, Dorneles EMS, Diniz C, Abreu V, Sousa C, Alves J, Carneiro A, Bagano P, Spier S, Barh D, Lage AP, Figueiredo H, Azevedo V. Quadruplex PCR assay for identification of Corynebacterium pseudotuberculosis differentiating biovar Ovis and Equi. BMC Vet Res 2017; 13:290. [PMID: 28946887 PMCID: PMC5613524 DOI: 10.1186/s12917-017-1210-5] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Accepted: 09/14/2017] [Indexed: 01/21/2023] Open
Abstract
BACKGROUND Corynebacterium pseudotuberculosis is classified into two biovars, nitrate-negative biovar Ovis which is the etiologic agent of caseous lymphadenitis in small ruminants and nitrate-positive biovar Equi, which causes abscesses and ulcerative lymphangitis in equines. The aim of this study was to develop a quadruplex PCR assay that would allow simultaneous detection and biovar-typing of C. pseudotuberculosis. METHODS In the present study, genomes of C. pseudotuberculosis strains were used to identify the genes involved in the nitrate reduction pathway to improve a species identification three-primer multiplex PCR assay. The nitrate reductase gene (narG) was included in the PCR assay along with the 16S, rpoB and pld genes to enhance the diagnosis of the multiplex PCR at biovar level. RESULTS A novel quadruplex PCR assay for C. pseudotuberculosis species and biovar identification was developed. The results of the quadruplex PCR of 348 strains, 346 previously well-characterized clinical isolates of C. pseudotuberculosis from different hosts (goats, sheep, horse, cattle, buffalo, llamas and humans), the vaccine strain 1002 and the type strain ATCC 19410T, were compared to the results of nitrate reductase identification by biochemical test. The McNemar's Chi-squared test used to compare the two methods used for C. pseudotuberculosis biovar identification showed no significant difference (P = 0.75) [95% CI for odds ratio (0.16-6.14)] between the quadruplex PCR and the nitrate biochemical test. Concordant results were observed for 97.13% (338 / 348) of the tested strains and the kappa value was 0.94 [95% CI (0.90-0.98)]. CONCLUSIONS The ability of the quadruplex assay to discriminate between C. pseudotuberculosis biovar Ovis and Equi strains enhances its usefulness in the clinical microbiology laboratory.
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Affiliation(s)
- Sintia Almeida
- Instituto de Ciências Biológicas, Federal University of Minas Gerais, Belo Horizonte, MG Brazil
| | - Elaine M. S. Dorneles
- Escola de Veterinária, Federal University of Minas Gerais, Belo Horizonte, MG Brazil
| | - Carlos Diniz
- Instituto de Ciências Biológicas, Federal University of Minas Gerais, Belo Horizonte, MG Brazil
- Departamento de Medicina Veterinária, Federal University of Lavras, Lavras, MG Brazil
| | - Vinícius Abreu
- Centro de Energia Nuclear na Agricultura, University of Sao Paulo, Piracicaba, SP Brazil
| | - Cassiana Sousa
- Instituto de Ciências Biológicas, Federal University of Minas Gerais, Belo Horizonte, MG Brazil
| | - Jorianne Alves
- Instituto de Ciências Biológicas, Federal University of Para, Belém, PA Brazil
| | - Adriana Carneiro
- Instituto de Ciências Biológicas, Federal University of Para, Belém, PA Brazil
| | - Priscilla Bagano
- Instituto de Ciências Biológicas, Federal University of Minas Gerais, Belo Horizonte, MG Brazil
| | - Sharon Spier
- Department of Medicine and Epidemiology, UC Davis School of Veterinary Medicine, Davis, CA USA
| | - Debmalya Barh
- Instituto de Ciências Biológicas, Federal University of Minas Gerais, Belo Horizonte, MG Brazil
- Centre for Genomics and Applied Gene Technology, Institute of Integrative Omics and Applied Biotechnology (IIOAB), Nonakuri, Purba Medinipur, WB India
| | - Andrey P. Lage
- Escola de Veterinária, Federal University of Minas Gerais, Belo Horizonte, MG Brazil
| | - Henrique Figueiredo
- Aquacen - National Reference Laboratory for Aquatic Animal Diseases, Federal University of Minas Gerais, Belo Horizonte, MG Brazil
| | - Vasco Azevedo
- Instituto de Ciências Biológicas, Federal University of Minas Gerais, Belo Horizonte, MG Brazil
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15
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Souto MSM, Coura FM, Dorneles EMS, Stynen APR, Alves TM, Santana JA, Pauletti RB, Guedes RMC, Viott AM, Heinemann MB, Lage AP. Antimicrobial susceptibility and phylotyping profile of pathogenic Escherichia coli and Salmonella enterica isolates from calves and pigs in Minas Gerais, Brazil. Trop Anim Health Prod 2017; 49:13-23. [PMID: 27709395 PMCID: PMC7089450 DOI: 10.1007/s11250-016-1152-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2016] [Accepted: 09/07/2016] [Indexed: 01/01/2023]
Abstract
The aims of the present study were to determine (i) the profiles of phylogroup and (ii) the antimicrobial susceptibility of pathogenic Escherichia coli strains isolated from calves, and of Salmonella spp. strains isolated from calves and pigs in Minas Gerais State, Brazil. Sixty-one pathogenic E. coli strains and Salmonella spp. (n = 24) strains isolated from fecal samples of calves and Salmonella spp. (n = 39) strains previously isolated from fecal samples of growing/finishing pigs were tested. The minimum inhibitory concentration (MIC) using the agar dilution method was determined for nalidixic acid, amikacin, amoxicillin, ampicillin, cefoxitin, norfloxacin, gentamicin, tetracycline, and trimethoprim-sulfamethoxazole. All E. coli isolates were susceptible to amikacin. Tetracycline was the antimicrobial that presented the higher frequency of resistance among E. coli strains, followed by ampicillin, trimethoprim-sulfamethoxazole, amoxicillin, nalidixic acid, norfloxacin, gentamicin, and cefoxitin. E. coli (n = 61) strains isolated from calves belonged to different phylogroup namely, phylogroup A (n = 26), phylogroup B1 (n = 31), phylogroup E (n = 3), and phylogroup F (n = 1). Phylogroups B2, C, and D were not identified among the E. coli in the present study. All Salmonella spp. (n = 24) strains isolated from fecal samples of calves were susceptible to amikacin, amoxicillin, ampicillin, norfloxacin, gentamicin, tetracycline, and trimethoprim-sulfamethoxazole. Resistance to nalidixic acid and cefoxitin was detected in 16.66 and 8.33 % of the Salmonella spp. strains, respectively. Among the Salmonella spp. (n = 39) strains isolated from fecal samples of pigs, the higher frequency of resistance was observed to tetracycline, followed by amoxicillin, gentamicin, ampicillin, trimethoprim-sulfamethoxazole, nalidixic acid, cefoxitin, and norfloxacin. All strains were susceptible to amikacin. Forty-eight (78.68 %) of the E. coli strains were classified as multidrug-resistant, whereas among Salmonella spp. strains, the percentage of multidrug resistance was 57.14 %, being all multidrug-resistant strains isolated from pigs (92.30 %). The results from the present study indicate a high frequency of antimicrobial resistance among pathogenic E. coli strains isolated from calves and Salmonella spp. strains isolated from pigs and a high rate of susceptibility to most antimicrobials tested among Salmonella spp. strains isolated from calves. Our study highlights the presence of multidrug-resistant strains of E. coli and Salmonella spp. isolated from food-producing animals in Minas Gerais, Brazil.
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Affiliation(s)
- Monalisa S M Souto
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
| | - Fernanda M Coura
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
| | - Elaine M S Dorneles
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
- Departamento de Medicina Veterinária, Universidade Federal de Lavras, Minas Gerais, Brazil
| | - Ana Paula R Stynen
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
| | - Telma M Alves
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
| | - Jordana Almeida Santana
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
| | - Rebeca B Pauletti
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
| | - Roberto M C Guedes
- Departamento de Clínica e Cirurgia Veterinárias, Escola de Veterinária, Universidade Federal de Minas Gerais, Minas Gerais, Brazil
| | - Aline M Viott
- Laboratório de Patologia Veterinária, Universidade Federal do Paraná, Campus Palotina, Paraná, Brazil
| | - Marcos B Heinemann
- Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, Brazil
| | - Andrey P Lage
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Minas Gerais, Brazil.
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16
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Haas DJ, Dorneles EMS, Spier SJ, Carroll SP, Edman J, Azevedo VA, Heinemann MB, Lage AP. Molecular epidemiology of Corynebacterium pseudotuberculosis isolated from horses in California. Infect Genet Evol 2016; 49:186-194. [PMID: 27979735 DOI: 10.1016/j.meegid.2016.12.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Revised: 11/10/2016] [Accepted: 12/10/2016] [Indexed: 11/26/2022]
Abstract
Corynebacterium pseudotuberculosis biovar Equi is an important pathogen of horses. It is increasing in frequency in the United States, and is responsible for various clinical forms of infection, including external abscesses, internal abscesses of the abdominal or thoracic cavities, and ulcerative lymphangitis. The host/pathogen factors dictating the form or severity of infection are currently unknown. Our recent investigations have shown that genotyping C. pseudotuberculosis isolates using enterobacterial repetitive intergenic consensus (ERIC)-PCR is useful for understanding the evolutionary genetics of the species as well for molecular epidemiology studies. The aims of the present study were to assess (i) the genetic diversity of C. pseudotuberculosis strains isolated from horses in California, United States and (ii) the epidemiologic relationships among isolates. One hundred and seven C. pseudotuberculosis biovar Equi isolates from ninety-five horses, and two C. pseudotuberculosis biovar Ovis strains, C. pseudotuberculosis ATCC 19410T type strain and C. pseudotuberculosis 1002 vaccine strain, were fingerprinted using the ERIC 1+2-PCR. C. pseudotuberculosis isolated from horses showed a high genetic diversity, clustering in twenty-seven genotypes with a diversity index of 0.91. Minimal spanning tree showed four major clonal complexes with a pattern of temporal clustering. Strains isolated from the same horse showed identical ERIC 1+2-PCR genotype, with the exception of two strains isolated from the same animal that showed distinct genotypes, suggesting a co-infection. We found no strong genetic signals related to clinical form (including internal versus external infections). However, temporal clustering of genotypes was observed.
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Affiliation(s)
- Dionei J Haas
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Elaine M S Dorneles
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil; Departamento de Medicina Veterinária, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil
| | - Sharon J Spier
- Department of Medicine and Epidemiology, University of California, Davis, California, USA
| | - Scott P Carroll
- Department of Medicine and Epidemiology, University of California, Davis, California, USA
| | - Judy Edman
- Department of Medicine and Epidemiology, University of California, Davis, California, USA
| | - Vasco A Azevedo
- Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Marcos B Heinemann
- Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária e Zootecnia, Universidade de São Paulo, São Paulo, Brazil
| | - Andrey P Lage
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.
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17
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Souza FN, Cunha AF, Rosa DL, Brito MAV, Guimarães AS, Mendonça LC, Souza GN, Lage AP, Blagitz MG, Libera AMD, Heinemann MB, Cerqueira MM. Somatic cell count and mastitis pathogen detection in composite and single or duplicate quarter milk samples. Pesq Vet Bras 2016. [DOI: 10.1590/s0100-736x2016000900004] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Abstract: The most acceptable criteria for diagnosing bovine intramammary infections include results of bacteriological culture and measures of inflammation. Therefore, information on the diagnostic characteristics of the procedures used to identify infected quarters is required. Thus, this study was designed to evaluate a set of criteria to classify the infectious status of an udder at the quarter (single and duplicate milk samples) and cow (composite milk sample) levels, and to compare the infectious status with somatic cell counts (SCCs) of the samples. Here, the SCC thresholds determined by receiver operating characteristic curve analysis had a higher Youden index using mammary quarter duplicate milk samples as the gold standard for testing compared with single quarter and composite milk samples, especially for samples for which at least one of the duplicates was microbiologically positive, regardless of the mastitis pathogen isolated. The kappa coefficient for bacteriological results of the single quarter milk samples (single S1 and S2) was 0.85±0.019, indicating that single quarter milk sampling can be useful in mastitis control programs. Therefore, the use of composite milk samples to detect mastitis pathogens may be limited to the detection of major pathogens, given their predictive values. Thus, our findings suggest that the milk SCCs and microbiological examinations, although regarded as the most reliable indicators of ongoing mastitis, should be used in an integrated manner in mastitis control programs. Furthermore, the accuracy of single, duplicate and composite microbiological analyses to diagnosis mastitis should be considered for its implications in mastitis control strategies.
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18
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Mol JPS, Pires SF, Chapeaurouge AD, Perales J, Santos RL, Andrade HM, Lage AP. Proteomic Profile of Brucella abortus-Infected Bovine Chorioallantoic Membrane Explants. PLoS One 2016; 11:e0154209. [PMID: 27104343 PMCID: PMC4841507 DOI: 10.1371/journal.pone.0154209] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2016] [Accepted: 04/11/2016] [Indexed: 12/20/2022] Open
Abstract
Brucella abortus is the etiological agent of bovine brucellosis, a zoonotic disease that causes significant economic losses worldwide. The differential proteomic profile of bovine chorioallantoic membrane (CAM) explants at early stages of infection with B. abortus (0.5, 2, 4, and 8 h) was determined. Analysis of CAM explants at 0.5 and 4 h showed the highest differences between uninfected and infected CAM explants, and therefore were used for the Differential Gel Electrophoresis (DIGE). A total of 103 spots were present in only one experimental group and were selected for identification by mass spectrometry (MALDI/ToF-ToF). Proteins only identified in extracts of CAM explants infected with B. abortus were related to recognition of PAMPs by TLR, production of reactive oxygen species, intracellular trafficking, and inflammation.
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Affiliation(s)
- Juliana P. S. Mol
- Universidade Federal de Minas Gerais, Escola de Veterinária, Departamento de Medicina Veterinária Preventiva, Belo Horizonte, Minas Gerais, Brazil
| | - Simone F. Pires
- Universidade Federal de Minas Gerais, Instituto de Ciências Biológicas, Departamento de Parasitologia, Belo Horizonte, Minas Gerais, Brazil
| | - Alexander D. Chapeaurouge
- Fundação Oswaldo Cruz, Instituto Oswaldo Cruz, Laboratório de Toxinologia, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Jonas Perales
- Fundação Oswaldo Cruz, Instituto Oswaldo Cruz, Laboratório de Toxinologia, Rio de Janeiro, Rio de Janeiro, Brazil
| | - Renato L. Santos
- Universidade Federal de Minas Gerais, Escola de Veterinária, Departamento de Clínica e Cirurgia Veterinárias, Minas Gerais, Brasil
| | - Hélida M. Andrade
- Universidade Federal de Minas Gerais, Instituto de Ciências Biológicas, Departamento de Parasitologia, Belo Horizonte, Minas Gerais, Brazil
| | - Andrey P. Lage
- Universidade Federal de Minas Gerais, Escola de Veterinária, Departamento de Medicina Veterinária Preventiva, Belo Horizonte, Minas Gerais, Brazil
- * E-mail:
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19
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Moreira ML, Dorneles EMS, Soares RP, Magalhães CP, Costa-Pereira C, Lage AP, Teixeira-Carvalho A, Martins-Filho OA, Araújo MSS. Cross-reactivity of commercially available anti-human monoclonal antibodies with canine cytokines: establishment of a reliable panel to detect the functional profile of peripheral blood lymphocytes by intracytoplasmic staining. Acta Vet Scand 2015; 57:51. [PMID: 26362860 PMCID: PMC4566394 DOI: 10.1186/s13028-015-0142-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Accepted: 08/27/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND The process for obtaining monoclonal antibodies against a specific antigen is very laborious, involves sophisticated technologies and it is not available in most research laboratories. Considering that most cytokines remain partially conserved among species during evolution, the search for antibody cross-reactivity is an important strategy for immunological studies in veterinary medicine. In this context, the amino acid sequence from human and canine cytokines have demonstrated 49-96 % homology, suggesting high probability of cross-reactivity amongst monoclonal antibodies. For this, 17 commercially available anti-human monoclonal antibodies [IL-1α, IL-1β, IL-2, IL-4, IL-5, IL-6, IL-8 (#1, #2), IL-10, IL-12, IL-13, IL-17A, IFN-γ (#1, #2), TNF-α (#1, #2) and TGF-β], were evaluated in vitro for intracellular cytokine detection in a stimulated canine blood culture by flow cytometry and confocal microscopy. Lymphocytes from peripheral blood of healthy and two unhealthy dogs were analyzed. RESULTS Eleven anti-human mAbs [IL-1α, IL-4, IL-5, IL-6, IL-8 (#1, #2), IL-12, IL-17A, TNF-α (#1, #2) and TGF-β] cross-reacted against canine intracellular cytokines. The specificity of the assays was not affected after Fc-blocking. Three anti-human cytokine mAbs [IL-4, IL-8 (#2) and TGF-β] when evaluated by confocal microscopy also cross-reacted with intracellular canine cytokines. The identification of human mAbs that cross-reacted with canine cytokines may support their use as immunological biomarkers in veterinary medicine studies. CONCLUSION The identification of these 11 anti-human cytokine mAbs that cross-reacted with canine cytokines will be useful immunological biomarkers for pathological conditions by flow cytometry and fluorescence microscopy in dogs.
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20
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Dorneles EMS, Lima GK, Teixeira-Carvalho A, Araújo MSS, Martins-Filho OA, Sriranganathan N, Al Qublan H, Heinemann MB, Lage AP. Immune Response of Calves Vaccinated with Brucella abortus S19 or RB51 and Revaccinated with RB51. PLoS One 2015; 10:e0136696. [PMID: 26352261 PMCID: PMC4564183 DOI: 10.1371/journal.pone.0136696] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Accepted: 08/05/2015] [Indexed: 12/28/2022] Open
Abstract
Brucella abortus S19 and RB51 strains have been successfully used to control bovine brucellosis worldwide; however, currently, most of our understanding of the protective immune response induced by vaccination comes from studies in mice. The aim of this study was to characterize and compare the immune responses induced in cattle prime-immunized with B. abortus S19 or RB51 and revaccinated with RB51. Female calves, aged 4 to 8 months, were vaccinated with either vaccine S19 (0.6-1.2 x 1011 CFU) or RB51 (1.3 x 1010 CFU) on day 0, and revaccinated with RB51 (1.3 x 1010 CFU) on day 365 of the experiment. Characterization of the immune response was performed using serum and peripheral blood mononuclear cells. Blood samples were collected on days 0, 28, 210, 365, 393 and 575 post-immunization. Results showed that S19 and RB51 vaccination induced an immune response characterized by proliferation of CD4+ and CD8+ T-cells; IFN-ɣ and IL-17A production by CD4+ T-cells; cytotoxic CD8+ T-cells; IL-6 secretion; CD4+ and CD8+ memory cells; antibodies of IgG1 class; and expression of the phenotypes of activation in T-cells. However, the immune response stimulated by S19 compared to RB51 showed higher persistency of IFN-ɣ and CD4+ memory cells, induction of CD21+ memory cells and higher secretion of IL-6. After RB51 revaccination, the immune response was chiefly characterized by increase in IFN-ɣ expression, proliferation of antigen-specific CD4+ and CD8+ T-cells, cytotoxic CD8+ T-cells and decrease of IL-6 production in both groups. Nevertheless, a different polarization of the immune response, CD4+- or CD8+-dominant, was observed after the booster with RB51 for S19 and RB51 prime-vaccinated animals, respectively. Our results indicate that after prime vaccination both vaccine strains induce a strong and complex Th1 immune response, although after RB51 revaccination the differences between immune profiles induced by prime-vaccination become accentuated.
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Affiliation(s)
- Elaine M. S. Dorneles
- Laboratório de Bacteriologia Aplicada, Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Graciela K. Lima
- Laboratório de Bacteriologia Aplicada, Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Andréa Teixeira-Carvalho
- Laboratório de Biomarcadores de Diagnóstico e Monitoração, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, Minas Gerais, Brazil
| | - Márcio S. S. Araújo
- Laboratório de Biomarcadores de Diagnóstico e Monitoração, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, Minas Gerais, Brazil
| | - Olindo A. Martins-Filho
- Laboratório de Biomarcadores de Diagnóstico e Monitoração, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, Minas Gerais, Brazil
| | - Nammalwar Sriranganathan
- Center for Molecular Medicine and Infectious Diseases, Department of Biomedical Sciences and Pathobiology, Virginia Maryland College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, United States of America
| | - Hamzeh Al Qublan
- Center for Molecular Medicine and Infectious Diseases, Department of Biomedical Sciences and Pathobiology, Virginia Maryland College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg, Virginia, United States of America
| | - Marcos B. Heinemann
- Departamento de Medicina Veterinária Preventiva e Saúde Animal, Faculdade de Medicina Veterinária e Zootecnia da Universidade de São Paulo, São Paulo, São Paulo, Brazil
| | - Andrey P. Lage
- Laboratório de Bacteriologia Aplicada, Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
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21
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Abstract
Brucella abortus vaccines play a central role in bovine brucellosis control/eradication programs and have been successfully used worldwide for decades. Strain 19 and RB51 are the approved B. abortus vaccines strains most commonly used to protect cattle against infection and abortion. However, due to some drawbacks shown by these vaccines much effort has been undertaken for the development of new vaccines, safer and more effective, that could also be used in other susceptible species of animals. In this paper, we present a review of the main aspects of the vaccines that have been used in the brucellosis control over the years and the current research advances in the development of new B. abortus vaccines.
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Affiliation(s)
- Elaine M S Dorneles
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Laboratório de Bacteriologia Aplicada, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
| | - Nammalwar Sriranganathan
- Department of Biomedical Sciences and Pathobiology, Center for Molecular Medicine and Infectious Diseases, Regional College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA.
| | - Andrey P Lage
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Laboratório de Bacteriologia Aplicada, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
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22
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Dorneles EMS, Teixeira-Carvalho A, Araújo MSS, Sriranganathan N, Lage AP. Immune response triggered by Brucella abortus following infection or vaccination. Vaccine 2015; 33:3659-66. [PMID: 26048781 DOI: 10.1016/j.vaccine.2015.05.057] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2015] [Revised: 05/16/2015] [Accepted: 05/21/2015] [Indexed: 01/18/2023]
Abstract
Brucella abortus live vaccines have been used successfully to control bovine brucellosis worldwide for decades. However, due to some limitations of these live vaccines, efforts are being made for the development of new safer and more effective vaccines that could also be used in other susceptible species. In this context, understanding the protective immune responses triggered by B. abortus is critical for the development of new vaccines. Such understandings will enhance our knowledge of the host/pathogen interactions and enable to develop methods to evaluate potential vaccines and innovative treatments for animals or humans. At present, almost all the knowledge regarding B. abortus specific immunological responses comes from studies in mice. Active participation of macrophages, dendritic cells, IFN-γ producing CD4(+) T-cells and cytotoxic CD8(+) T-cells are vital to overcome the infection. In this review, we discuss the characteristics of the immune responses triggered by vaccination versus infection by B. abortus, in different hosts.
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Affiliation(s)
- Elaine M S Dorneles
- Laboratório de Bacteriologia Aplicada, Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Avenida Antônio Carlos 6627, 31270-901, Belo Horizonte, Minas Gerais, Brazil
| | - Andréa Teixeira-Carvalho
- Laboratório de Biomarcadores de Diagnóstico e Monitoração, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Avenida Augusto de Lima 1715, 30190-002, Belo Horizonte, Minas Gerais, Brazil
| | - Márcio S S Araújo
- Laboratório de Biomarcadores de Diagnóstico e Monitoração, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Avenida Augusto de Lima 1715, 30190-002, Belo Horizonte, Minas Gerais, Brazil
| | - Nammalwar Sriranganathan
- Center for Molecular Medicine and Infectious Diseases, Department of Biomedical Sciences and Pathobiology, Virginia Maryland College of Veterinary Medicine, Virginia Polytechnic Institute and State University, 1410 Prices Fork Rd, Blacksburg, VA 24061, USA
| | - Andrey P Lage
- Laboratório de Bacteriologia Aplicada, Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Avenida Antônio Carlos 6627, 31270-901, Belo Horizonte, Minas Gerais, Brazil.
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23
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Abstract
The aim of this study was to evaluate the growth of the B. abortus
reference strains and field isolates on media containing different inhibitor agents. Reference strains were seeded on tryptose agar containing: i-erythritol (1.0 mg/mL), fuchsin (20 μg/mL and 80 μg/mL), thionin (2.5 μg/mL and 10 μg/mL), rifampicin (200 μg/mL) and safranin O (200 μg/mL). Field isolates were tested only on media containing i-erythritol, rifampicin and thionin. Furthermore, each suspension was also inoculated on tryptose agar incubated in air, to test its ability to grow without CO
2
. Sensitivity to fuchsin was similar among reference strains evaluated. Growth of S19, 544 and 2308 but not RB51 were inhibited on media containing rifampicin. Medium with safranin O showed no inhibition for RB51, 544 and 2308, but it partially inhibited the S19 growth as well as medium containing i-erythritol. Treatment/control growth ratio for 2308 on tryptose agar containing thionin (2.5 μg/mL) was approximatelly 1.0, whereas S19 and RB51 showed 0.85 and 0.89 ratios, respectively. Growth of 544, S19 and RB51 but not 2308 was completely inhibited on medium with thionin (10 μg/mL). All field strains grew on medium containing i-erythritol, but were completelly inhibited by rifampicin. With exception of A1 (
B. abortus
biovar 3) all field isolates grew on medium with thionin, although some strains showed a treatment/control growth ratio of 0.75–0.80 (10 μg/mL). These results showed that tryptose agar with thionin, i-erythritol or rifampicin could be useful for differentiating vaccine, challenge and field strains of B. abortus.
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Affiliation(s)
- Karina L Miranda
- Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Elaine M S Dorneles
- Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Fernando P Poester
- Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Paulo S Martins Filho
- Laboratório Regional de Apoio Animal, Ministério da Agricultura, Pecuária e Abastecimento, Pedro Leopoldo, MG, Brazil
| | - Rebeca B Pauletti
- Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Andrey P Lage
- Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
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Dorneles EMS, Araújo MSS, Teixeira-Carvalho A, Martins-Filho OA, Lage AP. Cross-reactivity of anti-human cytokine monoclonal antibodies used as a tool to identify novel immunological biomarkers in domestic ruminants. Genet Mol Res 2015; 14:940-51. [PMID: 25730032 DOI: 10.4238/2015.february.3.1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
Eleven commercially available PE-labeled anti-human (IL-1-α, IL-6, IL-8, TNF-α, IL-17A, IL-5, IL-10, IL-12 and IL-13) and anti-mouse (IL-10, TNF-α) cytokine monoclonal antibodies (mAbs) were tested for cross-reactivity with cattle, goat, and sheep cytokines. Cross-reactivity was assessed by comparative analysis with the standard reactivity of the target species. Our data demonstrated that anti-human IL-1-α, IL-6, IL-8, IL-17A and IL-10 mAbs cross-react with all ruminant species tested. Anti-human IL-5 mAb showed a strong cross-reactivity with cattle and goat IL-5, while anti-human TNF-α mAb showed a selective cross-reactivity with goat TNF-α. No cross-reactivity with the ruminant cytokines was observed for anti-human IL-12 and IL-13 mAbs or for the two anti-mouse cytokine mAbs tested. The present study demonstrated the cross-reactivity of various anti-human cytokine mAbs with cattle, sheep, and goat cytokines, increasing the range of immunological biomarkers for studies in veterinary medicine.
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Affiliation(s)
- E M S Dorneles
- Laboratório de Bacteriologia Aplicada, Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brasil
| | - M S S Araújo
- Laboratório de Biomarcadores de Diagnóstico e Monitoração, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, MG, Brasil
| | - A Teixeira-Carvalho
- Laboratório de Biomarcadores de Diagnóstico e Monitoração, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, MG, Brasil
| | - O A Martins-Filho
- Laboratório de Biomarcadores de Diagnóstico e Monitoração, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, MG, Brasil
| | - A P Lage
- Laboratório de Bacteriologia Aplicada, Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brasil
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25
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Dorneles EMS, Teixeira-Carvalho A, Araújo MSS, Lima GK, Martins-Filho OA, Sriranganathan N, Lage AP. T lymphocytes subsets and cytokine pattern induced by vaccination against bovine brucellosis employing S19 calfhood vaccination and adult RB51 revaccination. Vaccine 2014; 32:6034-8. [PMID: 25218192 DOI: 10.1016/j.vaccine.2014.08.060] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Revised: 08/13/2014] [Accepted: 08/27/2014] [Indexed: 11/24/2022]
Abstract
The aims of this study were to address the protective immune response induced by S19 vaccination (n=10) and RB51 revaccination, in pregnant (n=9) and non-pregnant (n=10) S19 calfhood-vaccinated cattle as follows: evaluate the in vitro CD4(+) and CD8(+) T-lymphocytes specific proliferation, and in vitro expression of IFN-γ by CD4(+) and CD8(+) T-cells and IL-4 by CD4(+), CD8(+) and CD21(+) lymphocytes subset. Upon in vitro stimulation with γ-irradiated Brucella abortus 2308, blood mononuclear cells from S19 vaccinated and RB51 revaccinated cows exhibited significantly higher proliferation of CD4(+) and CD8(+) T-lymphocytes and CD4(+)IFN-γ(+) T-cells compared to non-vaccinated animals. RB51 revaccination, regardless of the pregnancy status, did not enhance the proliferation of CD4(+) or CD8(+) T-cells nor IFN-γ or IL-4 production. Data from the present study suggest that cattle's cellular immune response induced after brucellosis vaccination and revaccination is due to CD4(+) and CD8(+) T-lymphocytes, being CD4(+) T-cells the main source of IFN-γ.
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Affiliation(s)
- Elaine M S Dorneles
- Laboratório de Bacteriologia Aplicada, Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Andréa Teixeira-Carvalho
- Laboratório de Biomarcadores de Diagnóstico e Monitoração, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, MG, Brazil
| | - Márcio S S Araújo
- Laboratório de Biomarcadores de Diagnóstico e Monitoração, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, MG, Brazil
| | - Graciela Kunrath Lima
- Laboratório de Bacteriologia Aplicada, Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil
| | - Olindo A Martins-Filho
- Laboratório de Biomarcadores de Diagnóstico e Monitoração, Centro de Pesquisas René Rachou, Fundação Oswaldo Cruz, Belo Horizonte, MG, Brazil
| | - Nammalwar Sriranganathan
- Center for Molecular Medicine and Infectious Diseases, Department of Biomedical Sciences and Pathobiology, Regional College of Veterinary Medicine, Virginia Polytechnic Institute and State University, Blacksburg, VA, USA
| | - Andrey P Lage
- Laboratório de Bacteriologia Aplicada, Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brazil.
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Abstract
A diarreia é uma das doenças mais frequentes de bezerros com até 30 dias de idade e é uma importante causa de perdas econômicas. Sua etiologia é complexa e envolve a interação de diversos fatores infecciosos, nutricionais, imunológicos, gerenciais e ambientais. Os principais sinais clínicos são a diarreia, desidratação progressiva, acidose metabólica, desequilíbrio de eletrólitos e balanço energético negativo com ou sem hipoglicemia, que se não tratados, levam à morte do animal. Escherichia coli se destaca como um importante enteropatógeno envolvido na síndrome diarreica. Cepas de E. coli patogênicas são classificadas em grupos ou patotipos, de acordo com a produção de fatores de virulência e mecanismos pelos quais causam doença. Já foram identificados cinco patotipos de E. coli associados à diarreia em bezerros: E. coli enterotoxigênica (ETEC), E. coli enteropatogênica (EPEC), E. coli enterohemorrágica (EHEC), E. coli produtora de toxina Shiga (STEC) e E. coli necrotoxigênica (NTEC). Nesse artigo apresentamos as principais características e os atuais conhecimentos sobre os patotipos de E. coli causadores de diarreia em bezerros.
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Affiliation(s)
| | | | - Marcos B. Heinemann
- Universidade Federal de Minas Gerais, Brasil; Universidade de São Paulo, Brasil
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27
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Dorneles EMS, Freire GN, Dasso MG, Poester FP, Lage AP. Genetic diversity of Brucella ovis isolates from Rio Grande do Sul, Brazil, by MLVA16. BMC Res Notes 2014; 7:447. [PMID: 25015223 PMCID: PMC4124495 DOI: 10.1186/1756-0500-7-447] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Accepted: 07/01/2014] [Indexed: 11/10/2022] Open
Abstract
Background Ovine epididymitis is predominantly associated with Brucella ovis infection. Molecular characterization of Brucella spp. achieved by multi-locus variable number of tandem repeats (VNTR) analyses (MLVA) have proved to be a powerful tool for epidemiological trace-back studies. Thus, the aim of this study was to evaluate the genetic diversity of Brucella ovis isolates from Rio Grande do Sul State, Brazil, by MLVA16. Findings MLVA16 genotyping identified thirteen distinct genotypes and a Hunter-Gaston diversity index of 0.989 among the fourteen B. ovis genotyped strains. All B. ovis MLVA16 genotypes observed in the present study represented non-previously described profiles. Analyses of the eight conserved loci included in panel 1 (MLVA8) showed three different genotypes, two new and one already described for B. ovis isolates. Among ten B. ovis isolates from same herd only two strains had identical pattern, whereas the four isolates with no epidemiologic information exhibited a single MLVA16 pattern each. Analysis of minimal spanning tree, constructed using the fourteen B. ovis strains typed in this study together with all nineteen B. ovis MLVA16 genotypes available in the MLVAbank 2014, revealed the existence of two clearly distinct major clonal complexes. Conclusions In conclusion, the results of the present study showed a high genetic diversity among B. ovis field isolates from Rio Grande do Sul State, Brazil, by MLVA16.
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Affiliation(s)
| | | | | | | | - Andrey P Lage
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil.
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28
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Sales ML, Fonseca AA, Orzil L, Alencar AP, Hodon MA, Issa MA, Soares Filho PM, Silva MR, Lage AP, Heinemann MB. Validation of two real-time PCRs targeting the PE-PGRS 20 gene and the region of difference 4 for the characterization of Mycobacterium bovis isolates. Genet Mol Res 2014; 13:4607-16. [PMID: 25036510 DOI: 10.4238/2014.june.18.3] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
This study aimed to develop and validate real-time PCR for the diagnosis of Mycobacterium bovis isolates. Two hundred and seventy-four M. bovis isolates and 156 M. tuberculosis isolates were tested. Both qPCRs amplified all of the 274 M. bovis samples, but none of the 156 M. tuberculosis samples. The qPCR for PE-PGRS 20 had 91% efficiency and a detection limit of 0.32 ng (sensitivity and specificity for qPCR "Mbovis.100" were 99.64 and 100%, respectively). The qPCR for RD4 had 100% efficiency, and a detection limit of 4 pg (diagnostic sensitivity and specificity were 100 and 100%. The qPCR tests were performed using 4 extraction sets, 3 qPCR kits, and with a range of equipment; yet, all combinations produced similar results in a diagnostic test, demonstrating the robustness of this method. The techniques proved to be efficient, robust, sensitive, and specific for the diagnosis of M. bovis.
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Affiliation(s)
- M L Sales
- Lanagro/MG, Ministério da Agricultura, Pecuária e Abastecimento, Pedro Leopoldo, MG, Brasil
| | - A A Fonseca
- Lanagro/MG, Ministério da Agricultura, Pecuária e Abastecimento, Pedro Leopoldo, MG, Brasil
| | - L Orzil
- Lanagro/MG, Ministério da Agricultura, Pecuária e Abastecimento, Pedro Leopoldo, MG, Brasil
| | - A P Alencar
- Lanagro/MG, Ministério da Agricultura, Pecuária e Abastecimento, Pedro Leopoldo, MG, Brasil
| | - M A Hodon
- Lanagro/MG, Ministério da Agricultura, Pecuária e Abastecimento, Pedro Leopoldo, MG, Brasil
| | - M A Issa
- Lanagro/MG, Ministério da Agricultura, Pecuária e Abastecimento, Pedro Leopoldo, MG, Brasil
| | - P M Soares Filho
- Lanagro/MG, Ministério da Agricultura, Pecuária e Abastecimento, Pedro Leopoldo, MG, Brasil
| | - M R Silva
- EMBRAPA Gado de Leite, Juiz de Fora, MG, Brasil
| | - A P Lage
- Escola de Veterinária da Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brasil
| | - M B Heinemann
- Escola de Veterinária da Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brasil
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29
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Dorneles EMS, Santana JA, Ribeiro D, Dorella FA, Guimarães AS, Moawad MS, Selim SA, Garaldi ALM, Miyoshi A, Ribeiro MG, Gouveia AMG, Azevedo V, Heinemann MB, Lage AP. Evaluation of ERIC-PCR as genotyping method for Corynebacterium pseudotuberculosis isolates. PLoS One 2014; 9:e98758. [PMID: 24901343 PMCID: PMC4046986 DOI: 10.1371/journal.pone.0098758] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2013] [Accepted: 05/06/2014] [Indexed: 11/19/2022] Open
Abstract
The aim of this study was to evaluate the Enterobacterial Repetitive Intergenic Consensus (ERIC-PCR) as a tool for molecular typing of C. pseudotuberculosis isolates from eight different hosts in twelve countries. Ninety-nine C. pseudotuberculosis field strains, one type strain (ATCC 19410T) and one vaccine strain (1002) were fingerprinted using the ERIC-1R and ERIC-2 primers, and the ERIC-1R+ERIC-2 primer pair. Twenty-nine different genotypes were generated by ERIC 1-PCR, 28 by ERIC 2-PCR and 35 by ERIC 1+2-PCR. The discriminatory index calculated for ERIC 1, ERIC 2, and ERIC 1+2-PCR was 0.89, 0.86, and 0.92, respectively. Epidemiological concordance was established for all ERIC-PCR assays. ERIC 1+2-PCR was defined as the best method based on suitability of the amplification patterns and discriminatory index. Minimal spanning tree for ERIC 1+2-PCR revealed three major clonal complexes and clustering around nitrate-positive (biovar Equi) and nitrate-negative (biovar Ovis) strains. Therefore, ERIC 1+2-PCR proved to be the best technique evaluated in this study for genotyping C. pseudotuberculosis strains, due to its usefulness for molecular epidemiology investigations.
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Affiliation(s)
- Elaine M. S. Dorneles
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Jordana A. Santana
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Dayana Ribeiro
- Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Fernanda Alves Dorella
- Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Alessandro S. Guimarães
- Embrapa Gado de Leite, Empresa Brasileira de Pesquisa Agropecuária, Juiz de Fora, Brazil
- Departmento de Medicina Veterinária, Universidade Federal de Lavras, Lavras, Minas Gerais, Brazil
| | - Mohamed S. Moawad
- Department of Toxicology and Forensic Medicine, Cairo University, Cairo, Egypt
| | - Salah A. Selim
- Department of Toxicology and Forensic Medicine, Cairo University, Cairo, Egypt
| | - Ana Luiza M. Garaldi
- Centro Biomédico, Faculdade de Ciências Médicas, Universidade Estadual do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Anderson Miyoshi
- Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Márcio G. Ribeiro
- Departamento de Higiene Veterinária e Saúde Pública, Faculdade de Medicina Veterinária e Zootecnia Universidade, Estadual Paulista, Botucatu, Brazil
| | - Aurora M. G. Gouveia
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Vasco Azevedo
- Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Marcos B. Heinemann
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Andrey P. Lage
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
- * E-mail:
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30
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Minharro S, Silva Mol JP, Dorneles EMS, Pauletti RB, Neubauer H, Melzer F, Poester FP, Dasso MG, Pinheiro ES, Soares Filho PM, Santos RL, Heinemann MB, Lage AP. Biotyping and genotyping (MLVA16) of Brucella abortus isolated from cattle in Brazil, 1977 to 2008. PLoS One 2013; 8:e81152. [PMID: 24324670 PMCID: PMC3855697 DOI: 10.1371/journal.pone.0081152] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2013] [Accepted: 10/17/2013] [Indexed: 11/28/2022] Open
Abstract
Brucellosis is a worldwide distributed zoonosis that causes important economic losses to animal production. In Brazil, information on the distribution of biovars and genotypes of Brucella spp. is scarce or unavailable. This study aimed (i) to biotype and genotype 137 Brazilian cattle isolates (from 1977 to 2008) of B. abortus and (ii) to analyze their distribution. B. abortus biovars 1, 2 and 3 (subgroup 3b) were confirmed and biovars 4 and 6 were first described in Brazil. Genotyping by the panel 1 revealed two groups, one clustering around genotype 40 and another around genotype 28. Panels 2A and 2B disclosed a high diversity among Brazilian B. abortus strains. Eighty-nine genotypes were found by MLVA16. MLVA16 panel 1 and 2 showed geographic clustering of some genotypes. Biotyping and MLVA16 genotyping of Brazilian B. abortus isolates were useful to better understand the epidemiology of bovine brucellosis in the region.
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Affiliation(s)
- Sílvia Minharro
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
- Escola de Medicina Veterinária e Zootecnia, Universidade Federal do Tocantins, Araguaína, Tocantins, Brazil
| | - Juliana P. Silva Mol
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Elaine M. S. Dorneles
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Rebeca B. Pauletti
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Heinrich Neubauer
- Friedrich-Loeffler-Institut, Bundesforschungsinstitut für Tiergesundheit, Institut für bakterielle Infektionen und Zoonosen, Jena, Germany
| | - Falk Melzer
- Friedrich-Loeffler-Institut, Bundesforschungsinstitut für Tiergesundheit, Institut für bakterielle Infektionen und Zoonosen, Jena, Germany
| | - Fernando P. Poester
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Maurício G. Dasso
- Fundação Estadual de Pesquisa Agropecuária, Instituto de Pesquisas Veterinárias Desidério Finamor, Eldorado do Sul, Rio Grande do Sul, Brazil
| | - Elaine S. Pinheiro
- Instituto Biológico, Centro de Pesquisa e Desenvolvimento de Sanidade Animal, São Paulo, São Paulo, Brazil
| | - Paulo M. Soares Filho
- Laboratório Nacional Agropecuário, Ministério da Agricultura, Pecuária e Abastecimento, Pedro Leopoldo, Minas Gerais, Brazil
| | - Renato L. Santos
- Departamento de Clínica e Cirurgia Veterinárias, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Marcos B. Heinemann
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
| | - Andrey P. Lage
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Minas Gerais, Brazil
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31
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Dorneles EMS, Santana JA, Andrade GI, Santos ELS, Guimarães AS, Mota RA, Santos AS, Miyoshi A, Azevedo V, Gouveia AMG, Lage AP, Heinemann MB. Molecular characterization of Corynebacterium pseudotuberculosis isolated from goats using ERIC-PCR. Genet Mol Res 2012; 11:2051-9. [PMID: 22911589 DOI: 10.4238/2012.august.6.9] [Citation(s) in RCA: 8] [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] [Indexed: 11/03/2022]
Abstract
Corynebacterium pseudotuberculosis, the infectious agent of caseous lymphadenitis (CLA), is responsible for substantial economic losses in goat and sheep production. Molecular characterization of C. pseudotuberculosis isolates by enterobacterial repetitive intergenic consensus (ERIC)-PCR has shown promising results in genotyping strains isolated from sheep with CLA. We evaluated the genetic diversity of C. pseudotuberculosis isolates collected from the Sertão region of the Pernambuco (PE) State, Brazil, and investigated the potential of ERIC-PCR as a tool for the molecular typing of strains of C. pseudotuberculosis isolated from goats. Thirty-two C. pseudotuberculosis strains isolated from goats in the municipalities of Floresta and Ibimirim, PE, C. pseudotuberculosis type strain ATCC 19410, the 1002 vaccine strain, and a field isolate of Rhodococcus equi were fingerprinted using the primers ERIC-1R and ERIC-2 and the primer pair ERIC- 1R+ERIC-2. Using 100% similarity as the cutoff, 8, 10, and 7 genotypes were obtained with ERIC-1-PCR, ERIC-2-PCR, and ERIC-1+2-PCR, respectively. The Hunter-Gaston discriminatory index calculated for the ERIC-1-PCR was 0.75. The index for the ERIC-2-PCR was 0.88, and the index for the ERIC-1+2-PCR was 0.79. Among goat isolates of C. pseudotuberculosis, three, two and four genotypes (found by ERIC-1-PCR, ERIC-2-PCR, and ERIC-1+2-PCR, respectively) had been previously described among sheep isolates from Minas Gerais State, Brazil. These results showed that ERIC-PCR has good discriminatory power and typeability, making it a useful tool for discrimination among C. pseudotuberculosis isolates from goats.
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Affiliation(s)
- E M S Dorneles
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, MG, Brasil
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32
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Ali A, Soares SC, Santos AR, Guimarães LC, Barbosa E, Almeida SS, Abreu VAC, Carneiro AR, Ramos RTJ, Bakhtiar SM, Hassan SS, Ussery DW, On S, Silva A, Schneider MP, Lage AP, Miyoshi A, Azevedo V. Campylobacter fetus subspecies: comparative genomics and prediction of potential virulence targets. Gene 2012; 508:145-56. [PMID: 22890137 DOI: 10.1016/j.gene.2012.07.070] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Accepted: 07/30/2012] [Indexed: 01/10/2023]
Abstract
The genus Campylobacter contains pathogens causing a wide range of diseases, targeting both humans and animals. Among them, the Campylobacter fetus subspecies fetus and venerealis deserve special attention, as they are the etiological agents of human bacterial gastroenteritis and bovine genital campylobacteriosis, respectively. We compare the whole genomes of both subspecies to get insights into genomic architecture, phylogenetic relationships, genome conservation and core virulence factors. Pan-genomic approach was applied to identify the core- and pan-genome for both C. fetus subspecies and members of the genus. The C. fetus subspecies conserved (76%) proteome were then analyzed for their subcellular localization and protein functions in biological processes. Furthermore, with pathogenomic strategies, unique candidate regions in the genomes and several potential core-virulence factors were identified. The potential candidate factors identified for attenuation and/or subunit vaccine development against C. fetus subspecies contain: nucleoside diphosphate kinase (Ndk), type IV secretion systems (T4SS), outer membrane proteins (OMP), substrate binding proteins CjaA and CjaC, surface array proteins, sap gene, and cytolethal distending toxin (CDT). Significantly, many of those genes were found in genomic regions with signals of horizontal gene transfer and, therefore, predicted as putative pathogenicity islands. We found CRISPR loci and dam genes in an island specific for C. fetus subsp. fetus, and T4SS and sap genes in an island specific for C. fetus subsp. venerealis. The genomic variations and potential core and unique virulence factors characterized in this study would lead to better insight into the species virulence and to more efficient use of the candidates for antibiotic, drug and vaccine development.
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Affiliation(s)
- Amjad Ali
- Federal University of Minas Gerais, Belo Horizonte, 31907-270, Minas Gerais, Brazil.
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Lopes LB, Alves TM, Stynen APR, Mota PM, Leite RC, Lage AP. Parameter estimation and use of gamma interferon assay for the diagnosis of bovine tuberculosis in Brazil. Pesq Vet Bras 2012. [DOI: 10.1590/s0100-736x2012000400001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This study aimed to evaluate the interference of tuberculin test on the gamma-interferon (INFg) assay, to estimate the sensitivity and specificity of the INFg assay in Brazilian conditions, and to simulate multiple testing using the comparative tuberculin test and the INFg assay. Three hundred-fifty cattle from two TB-free and two TB-infected herds were submitted to the comparative tuberculin test and the INFg assay. The comparative tuberculin test was performed using avian and bovine PPD. The INFg assay was performed by the BovigamTM kit (CSL Veterinary, Australia), according to the manufacturer's specifications. Sensitivity and specificity of the INFg assay were assessed by a Bayesian latent class model. These diagnostic parameters were also estimate for multiple testing. The results of INFg assay on D0 and D3 after the comparative tuberculin test were compared by the McNemar's test and kappa statistics. Results of mean optical density from INFg assay on both days were similar. Sensitivity and specificity of the INFg assay showed results varying (95% confidence intervals) from 72 to 100% and 74 to 100% respectively. Sensitivity of parallel testing was over 97.5%, while specificity of serial testing was over 99.7%. The INFg assay proved to be a very useful diagnostic method.
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Guimarães AS, Carmo FB, Heinemann MB, Portela RWD, Meyer R, Lage AP, Seyffert N, Miyoshi A, Azevedo V, Gouveia AMG. High sero-prevalence of caseous lymphadenitis identified in slaughterhouse samples as a consequence of deficiencies in sheep farm management in the state of Minas Gerais, Brazil. BMC Vet Res 2011; 7:68. [PMID: 22067701 PMCID: PMC3256107 DOI: 10.1186/1746-6148-7-68] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2010] [Accepted: 11/08/2011] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Caseous lymphadenitis (CLA), caused by Corynebacterium pseudotuberculosis, is one of the most important diseases of sheep and goats, causing considerable economic losses for herd owners. RESULTS We assessed the seroprevalence of infection with C. pseudotuberculosis in 805 sheep from 23 sheep farms that supply slaughterhouses in the state of Minas Gerais; we also analyzed management practices that could be associated with CLA occurrence, used on these and nearby farms that also supplied animals to the slaughterhouse (n = 60). The serum samples for assaying CLA infection were taken at the slaughterhouse. Frequency of infection with C. pseudotuberculosis was estimated at 43.7%, and farm frequency was estimated at 100%. Management practices were analyzed through a questionnaire. All farmers (60/60) had extensive/semi-extensive rearing system; 70.0% (42/60) identified sheep individually; 11.7% (7/60) had periodical technical assistance; 41.7% (25/60) disinfected the facilities; 86.7% (52/60) used barbed wire fences and did not implement adequate CLA control measures; only 11.7% (7/60) of breeders reported vaccination against C. pseudotuberculosis; 13.3% (8/60) took note of animals with clinical signs of CLA; 1.7% (1/60) opened and sanitized abscesses, and isolated the infected animals; 10.0% (6/60) knew the zoonotic potential of this disease and 1.7% (1/60) of the farmers culled animals in case of recurrence of abscesses. CONCLUSIONS It can be concluded that C. pseudotuberculosis infection is widely spread in sheep flocks in Minas Gerais state in Brazil and that there is a lack of good management measures and vaccination, allowing transmission of this infectious agent throughout the production network.
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Affiliation(s)
- Alessandro S Guimarães
- Nucleo de Saúde Animal e Microbiologia do Leite, Embrapa Gado de Leite, Rua Eugênio do Nascimento, 610, Juiz de Fora, Postal Code 36038-330, Minas Gerais, Brasil
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Rodrigues RO, Herrmann GP, Heinemann MB, Lage AP, Lopes LB, Moreira EC. Comparação entre a imunidade induzida em bovinos vacinados com bacterinas polivalentes comerciais e uma monovalente experimental. Pesq Vet Bras 2011. [DOI: 10.1590/s0100-736x2011000100002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
O presente estudo avaliou a indução da produção de anticorpos contra Leptospira spp.por dez bacterinas, sendo nove polivalentes e uma monovalente experimental para a sorovariedade Hardjo amostra Norma. A concentração celular foi controlada e utilizou-se adjuvante de emulsão óleo em água. Um ensaio imunoenzimático (ELISA) indireto foi desenvolvido utilizando-se conjugado anti-IgG total para mensurar os níveis de anticorpos da classe IgG conferido pelas bacterinas utilizando três amostras diferentes: Hardjoprajitino, Norma e Hardjo-bovis. Paralelamente foi utilizado também o Teste de Soroaglutinação Microscópica (SAM) para mensurar os níveis de anticorpos contra as mesmas amostras. Encontraram-se títulos variáveis entre as bacterinas de acordo com o teste ELISA. Os títulos no SAM foram de pouca intensidade e de curta duração indicando a necessidade de controle celular para uma posterior padronização destes produtos. Com base nos resultados encontrados no presente estudo, a bacterina monovalente foi a que apresentou melhor desempenho.
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Affiliation(s)
- Rogério O. Rodrigues
- Universidade Federal de Minas Gerais, Brasil; Universidade Vale do Rio Doce, Brasil
| | | | | | | | - Luciano B. Lopes
- Universidade Federal de Minas Gerais, Brasil; Empresa Brasileira de Pesquisa Agropecuária, Brasil
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Xavier MN, Silva TM, Costa ÉA, Paixão TA, Moustacas VS, Carvalho Júnior CA, Sant’Anna FM, Robles CA, Gouveia AM, Lage AP, Tsolis RM, Santos RL. Development and evaluation of a species-specific PCR assay for the detection of Brucella ovis infection in rams. Vet Microbiol 2010; 145:158-64. [DOI: 10.1016/j.vetmic.2010.02.037] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2009] [Revised: 02/26/2010] [Accepted: 02/26/2010] [Indexed: 10/19/2022]
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Neta AVC, Mol JP, Xavier MN, Paixão TA, Lage AP, Santos RL. Pathogenesis of bovine brucellosis. Vet J 2010; 184:146-55. [DOI: 10.1016/j.tvjl.2009.04.010] [Citation(s) in RCA: 111] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2008] [Revised: 02/05/2009] [Accepted: 04/13/2009] [Indexed: 12/14/2022]
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Mota PM, Pires PS, Assis RAD, Salvarani FM, Leite RDM, Dias LD, Leite RC, Lobato FC, Guedes RM, Lage AP. Paratuberculosis in a dairy Gyr herd in the State of Paraíba, Brazil. Pesq Vet Bras 2009. [DOI: 10.1590/s0100-736x2009000900004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
This paper describes the clinical, pathological, and microbiologic aspects of paratuberculosis (Johne's disease) in a dairy Gyr herd in the State of Paraíba, northeastern Brazil. An eight years old cow with chronic unresponsive diarrhea was clinically examined and euthanized for pathological evaluation. Fecal samples from all 160 animals over 12 months of age from the herd were collected for isolation of Mycobacterium avium subsp. paratuberculosis. Clinically, the index case cow was severely dehydrated, cachectic, with profuse mucous diarrhea. The main post-mortem findings were emaciation and thickened intestinal wall. Microscopically, the intestinal lamina propria and submucosa were infiltrated by macrophages, epithelioid cells, and Langhans giant cells with numerous alcohol-acid resistant bacilli in the cytoplasm. Two fecal samples displayed growth in slants of Herrold's egg-yolk agar supplemented with mycobactin J, 150 days after incubation. No growth was noticed in slants without mycobactin J. Microscopic examination of the isolated microorganisms stained by Ziehl-Neelsen revealed considerable amounts of alcohol-acid resistant bacilli, morphologically compatible with Mycobacterium spp. Based on the clinical signs, gross and histological lesions, growth time, bacterial morphology in Ziehl-Neelsen staining, and dependence of mycobactin J, the first diagnosis of paratuberculosis in Zebu cattle was made.
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Seyffert N, Guimarães AS, Pacheco LGC, Portela RW, Bastos BL, Dorella FA, Heinemann MB, Lage AP, Gouveia AMG, Meyer R, Miyoshi A, Azevedo V. High seroprevalence of caseous lymphadenitis in Brazilian goat herds revealed by Corynebacterium pseudotuberculosis secreted proteins-based ELISA. Res Vet Sci 2009; 88:50-5. [PMID: 19665155 DOI: 10.1016/j.rvsc.2009.07.002] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2009] [Revised: 06/02/2009] [Accepted: 07/03/2009] [Indexed: 11/28/2022]
Abstract
We conducted a seroepidemiological survey to determine the prevalence of caseous lymphadenitis (CLA) in goat herds in Minas Gerais state, Brazil. Serum samples were collected from goats (n=676) from 108 rural properties in 2001, covering most of the sub-regions of this ca. 586,500 square kilometer state. Antibodies against Corynebacterium pseudotuberculosis secreted proteins were detected by an indirect enzyme-linked immunosorbent assay (ELISA). Most of the animals (78.9%) tested positive for CLA; 98% of flocks presented at least one seropositive animal. Goats managed under an extensive production system had a significantly higher seroprevalence of CLA than those in intensive and semi-intensive operations. The age distribution of the animals in the flocks affected the prevalence of this disease; however, goat breed did not. We found seropositivity against C. pseudotuberculosis to be highly prevalent in these Brazilian goat herds; consequently, appropriate management practices for the control of CLA should be implemented.
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Affiliation(s)
- N Seyffert
- Laboratório de Genética Celular e Molecular, Departamento de Biologia Geral, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, CP 486, CEP 31270-901, Belo Horizonte, MG, Brazil
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Paixão TA, Poester FP, Carvalho Neta AV, Borges AM, Lage AP, Santos RL. NRAMP1 3' untranslated region polymorphisms are not associated with natural resistance to Brucella abortus in cattle. Infect Immun 2007; 75:2493-9. [PMID: 17353292 PMCID: PMC1865736 DOI: 10.1128/iai.01855-06] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The NRAMP1 gene encodes a divalent cation transporter, located in the phagolysosomal membrane of macrophages, that has been associated with resistance to intracellular pathogens. In cattle, natural resistance against brucellosis has been associated with polymorphisms at the 3' untranslated region (3'UTR) of the NRAMP1 gene, which are detectable by single-strand conformational analysis (SSCA). This study aimed to evaluate the association between NRAMP1 3'UTR polymorphisms and resistance against bovine brucellosis in experimental and natural infections. In experimentally infected pregnant cows, abortion occurred in 42.1% of cows with a resistant genotype (SSCA(r); n = 19) and in 43.1% of those with a susceptible genotype (SSCA(s); n = 23). Furthermore, no association between intensity of pathological changes and genotype was detected. In a farm with a very high prevalence of bovine brucellosis, the percentages of strains of the SSCA(r) genotype were 86 and 84% in serologically positive (n = 64) and negative (n = 36) cows, respectively. Therefore, no association was found between the NRAMP1-resistant allele and the resistant phenotype in either experimental or naturally occurring brucellosis. To further support these results, bacterial intracellular survival was assessed in bovine monocyte-derived macrophages from cattle with either the resistant or susceptible genotype. In agreement with our previous results, no difference was observed in the rates of intracellular survival of B. abortus within macrophages from cattle with susceptible or resistant genotypes. Taken together, these results indicate that these polymorphisms at the NRAMP1 3'UTR do not affect resistance against B. abortus in cattle and that they are therefore not suitable markers of natural resistance against bovine brucellosis.
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Affiliation(s)
- Tatiane A Paixão
- Departamento de Clínica e Cirurgia Veterinária, Escola de Veterinária da UFMG, Depto. Clínica e Cirurgia Vet., Av. Antônio Carlos, 6627, 31270-901 Belo Horizonte, MG, Brazil
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Poester FP, Gonçalves VSP, Paixão TA, Santos RL, Olsen SC, Schurig GG, Lage AP. Efficacy of strain RB51 vaccine in heifers against experimental brucellosis. Vaccine 2006; 24:5327-34. [PMID: 16713034 DOI: 10.1016/j.vaccine.2006.04.020] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.2] [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: 02/01/2006] [Revised: 04/04/2006] [Accepted: 04/09/2006] [Indexed: 10/24/2022]
Abstract
With the goal of providing an additional tool for controlling bovine brucellosis in Brazil and evaluating the full calf dose in adult cattle, the efficacy of the rough Brucella abortus strain RB51 vaccine was tested in heifers. Thirty-three females of approximately 24 months of age were divided in two groups: one group (n=20) received the RB51 vaccine and the other group (n=13) were used as non-vaccinated control. Animals in the vaccinated group were split in two sub-groups. One sub-group (n=12) was vaccinated subcutaneously with 1.5x10(10) colony forming units (CFU) of RB51 at Day 0 of the experiment and the other sub-group (n=8) was vaccinated subcutaneously with 1.6x10(10) CFU of RB51 at 60 days of gestation (Day 260 of the experiment). All cattle were challenged between 6 and 7 months of pregnancy with 3x10(8) CFU of the virulent strain 2308 of B. abortus by the conjunctival route. Vaccination with RB51 vaccine did not result in the production of any antibodies against the O-side chain of lipopolysaccharide (LPS), as measured by conventional serological tests (rose bengal plate agglutination test (RBPAT), standard tube agglutination test (STAT), and 2-mercaptoethanol test (2ME)). A total of 25% cumulative incidence of abortions was found in the vaccinated group, whereas in the control group the cumulative incidence was 62%. B. abortus RB51 was not isolated from any sample, and no abortions were produced by RB51 vaccination of females at 60 days of pregnancy. The results indicate that vaccination with RB51 prevented 59.4% of abortions, 58.6% of cow infections, and 61.0% of fetal infections. The relative risk (RR) revealed that non-vaccinated animals have 2.462 (95% CI 1.029-5.889) times higher risk of aborting than RB51-vaccinated animals.
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Affiliation(s)
- Fernando P Poester
- Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte - MG, Brazil
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Paixão TA, Ferreira C, Borges AM, Oliveira DAA, Lage AP, Santos RL. Frequency of bovine Nramp1 (Slc11a1) alleles in Holstein and Zebu breeds. Vet Immunol Immunopathol 2005; 109:37-42. [PMID: 16112749 DOI: 10.1016/j.vetimm.2005.07.018] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.5] [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: 05/05/2005] [Revised: 07/06/2005] [Accepted: 07/06/2005] [Indexed: 11/28/2022]
Abstract
Natural resistance against brucellosis in cattle is linked to the Nramp1 gene, which encodes a divalent cation transporter that localizes in the phagolysosome membrane in macrophages. Nramp1 gene in mouse plays a critical role in innate immunity favoring bacterial killing by macrophages in addition to its influence on adaptative immunity. Polymorphisms at the bovine Nramp1 3' untranslated region (3'UTR), detectable by Single Strand Conformational Analysis (SSCA), are associated with natural resistance against brucellosis. Such polymorphisms are associated with variation in the number of GT repeats. This study compared the frequency of Nramp1 3'UTR polymorphisms between Zebu and European bovine breeds. Eighty-one Holsteins (Bos taurus taurus) and 167 Zebu (Bos taurus indicus), including the following breeds: Nelore (n=95), Guzerá (n=37), and Gir (n=35), totaling 248 pure breed cattle studied. DNA extraction was performed using the guanidium protocol and genotyping was performed by SSCA. DNA from cattle considered genotypically resistant to brucellosis resulted in a single band (homozygous) with 175bp, corresponding to the 3'UTR with 13 GT pairs (GT13), whereas DNA from genotypically susceptible cattle generated one single band with 177bp (homozygous GT14) or double bands with both 175 and 177bp, or 175 and 179bp (heterozygous GT13/GT14 or GT13/GT15, respectively). A marked difference in the frequency of alleles was detected between the Zebu and Holstein cattle. Holsteins had an extremely homogeneous genotype, with 100% of the individuals with a GT13 genotype. In sharp contrast the Nelore breed had the most heterogeneous genotype with four allelic combinations, namely, homozygous GT13, homozygous GT14, heterozygous GT13/GT14, and heterozygous GT13/GT15. When the Zebu breeds were compared to each other, the only significant difference observed was the frequencies of the genotypes GT13 and GT14 between the Nelore and Guzerá breeds. The knowledge of allelic frequencies in different breeds of cattle may prove to be very useful in the future for planning breeding strategies for selection of resistant cattle.
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Affiliation(s)
- Tatiane A Paixão
- Escola de Veterinária, Universidade Federal de Minas Gerais, Av. Antônio Carlos, 6627-31270-901 Belo Horizonte, MG, Brazil
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Parreiras PM, Lobato FCF, Alencar AP, Figueiredo TD, Gomes HM, Boéchat N, Lage AP, Assis RA, Pereira MAS, Souza PR, Mota PMPC, Suffys PN. Drug susceptibility of Brazilian strains of Mycobacterium bovis using traditional and molecular techniques. Mem Inst Oswaldo Cruz 2004; 99:749-52. [PMID: 15654433 DOI: 10.1590/s0074-02762004000700015] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2023] Open
Abstract
Transmission of Mycobacterium bovis from cattle to humans has been reported and can cause tuberculosis (Tb) and a problem in certain risk populations. Therefore, knowledge of resistance of M. bovis towards antibiotics used for therapy of human Tb could help avoiding cure delay and treatment cost increase when dealing with drug resistant organisms. We therefore evaluated the susceptibility of M. bovis isolates towards streptomycin, isoniazide, rifampicin, ethambutol, and ethionamide, the first line antibiotics for human Tb. Therefore, 185 clinical samples from cattle with clinical signs of tuberculosis were processed and submitted to culturing and bacterial isolates to identification and drug susceptibility testing using the proportion method. Among 89 mycobacterial strains, 65 were identified as M. bovis and none were resistant to any of the antibiotics used. Confirmation of present results by future studies, enrolling a large number of isolates and designed to properly represent Brazilian regions, may favor the idea of using isoniazide preventive therapy as part of a Tb control strategy in special situations. Also, nucleic acids from bacterial isolates were submitted to rifoligotyping, a recently described reverse hybridization assay for detection of mutations causing resistance towards rifampicin. Concordance between the conventional and the molecular test was 100%, demonstrating the use of such methodology for rapid evaluation of drug susceptibility in M. bovis.
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Affiliation(s)
- Patrícia M Parreiras
- Laboratório de Biologia Molecular Aplicada à Micobactérias, Departamento de Medicina Tropical, Instituto Oswaldo Cruz-Fiocruz, Av. Brasil 4365, 21040-900 Rio de Janeiro, RJ, Brazil
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Abstract
Angiogenesis and tumor growth in conscious mice have been determined using the kinetics of appearance of a fluorescent tracer in the bloodstream after application to subcutaneously implanted sponges bearing tumor cells. The functional parameter expressed in terms of half-time (t(1/2); time taken for the fluorescence to reach 50% of the peak in the systemic circulation), which is inversely proportional to blood flow, showed that in the tumor-free implants t(1/2) values decreased from 11.55 +/- 1 min at day 1 to 5.7 +/- 0. 44 min by day 14. In the tumor-bearing implants, this process was accelerated and maximum vascularization was achieved by day 7 (3 days after tumor cell inoculation). Increases in t(1/2) values were observed at days 10 and 14, which paralleled the tumor growth as indicated by wet weight. The hemoglobin content (microg Hb/mg wet weight) in the tumor-free group increased during the 14-day period. In contrast, in the tumor-bearing implants. Hb concentration decreased per unit of tissue weight. Dexamethasone treatment for 13 days prevented fibrovascular tissue infiltration in tumor-free implants, but was unable to delay tumor growth, indicating that this procedure can be used to exclude the inflammatory reaction induced by the implantation technique, thus allowing tumor angiogenesis to be studied without the confounding influence of the host inflammatory cells. The results of our experimental observation indicate the suitability of this combination of techniques for analyzing angiogenesis induced by tumor cells and several hemodynamic features of Ehrlich tumor growth in awake animals.
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Affiliation(s)
- A P Lage
- Department of Physiology and Biophysics, Institute of Biological Sciences, Federal University of Minas Gerais, Av. Antônio Carlos 6627, Campus Pampulha, Cep, 31270-901, Brazil
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Abstract
Bovine herpesvirus 1 (BHV-1) is frequently associated with abortion in naturally and experimentally infected cattle. Most of the virus isolation and immunofluorescent antibody protocols described in the literature for detecting BHV-1 in bovine foetuses are rather laborious, costly and time-consuming. The detection is described of BHV-1 in the tissues of a naturally aborted bovine foetus by a nested PCR assay with no further hybridization procedures. Optimal results were achieved by filtering the foetal tissues on a chromatography column before DNA extraction, by using two pairs of primers in a nested PCR and by evaluating the amplification products on silver-stained polyacrylamide gels. This nested PCR was faster and easier to perform than the virus isolation test. To our knowledge, this is the first time that BHV-1 has been detected in the tissues of a naturally infected bovine foetus by means of a nested PCR. The test seems to be a practical alternative for rapid detection of BHV-1 in bovine foetus.
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Affiliation(s)
- M A Rocha
- Departamento de Medicina Veterinária Preventiva, Escola de Veterinária, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
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Lage AP, Fauconnier A, Burette A, Glupczynski Y, Bollen A, Godfroid E. Rapid colorimetric hybridization assay for detecting amplified Helicobacter pylori DNA in gastric biopsy specimens. J Clin Microbiol 1996; 34:530-3. [PMID: 8904408 PMCID: PMC228840 DOI: 10.1128/jcm.34.3.530-533.1996] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.8] [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: 02/02/2023] Open
Abstract
A very simple, practical, sensitive, and specific colorimetric hybridization assay for detecting amplified Helicobacter pylori DNA is described. This assay, which combines a sensitive sandwich DNA hybridization reaction and a colorimetric protocol similar to those used in conventional enzyme immunoassays, was shown to be suitable for detecting H. pylori-infected gastric biopsy specimens and for monitoring the eradication of the pathogen after treatment. The specificity and sensitivity of the colorimetric hybridization assay were tested by assaying 27 H. pylori strains (4 reference and 23 clinical isolates), 9 strains of other Helicobacter spp. or Campylobacter spp., and 11 clinical isolates of other urease-positive bacteria. The likelihood of H. pylori detection in gastric biopsy specimens by the colorimetric hybridization assay was evaluated with 23 H. pylori-positive and 41 H. pylori-negative biopsy specimens on the basis of positive and negative results, respectively, of culture, rapid urease test, histological examination, and PCR. Biopsy specimens from 33 treated patients, endoscopied 4 to 8 weeks after the end of treatment, were also tested. All H. pylori strains showed positive results in the colorimetric hybridization assay, presenting optical densities at 450 nm (OD450S) of > or = 3.0. None of the other Helicobacter spp., Campylobacter spp., or the clinical isolates of other urease-positive bacteria showed OD450S equal to or greater than the cutoff (mean OD450 cutoff, 0.208). The colorimetric hybridization assay detected all 23 H. pylori-positive biopsy specimens (mean OD450, 2.910 +/- 0.295), while none of the H. pylori-negative biopsy specimens was shown to be positive in the assay (mean OD450, 0.108 +/- 0.025). H. pylori was considered to be not eradicated from three of the posttreatment biopsy specimens by culture, rapid urease test, histological examination, and PCR. They were all positive by the colorimetric hybridization assay, and their OD450S were > or = 3.0. The colorimetric hybridization assay also detected two other H. pylori-positive patients. Specimens from these two patients had negative culture, rapid urease test, and histology results, and a specimen from one of them also tested negative by PCR. These results indicate that the colorimetric hybridization assay is a suitable method both for the diagnosis of H. pylori in biopsy specimens and for the follow-up of patients after the end of treatment.
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Affiliation(s)
- A P Lage
- Service de Genetique Appliquee, Universite Libre de Bruxelles, Belgium
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Lage AP, Castro RS, Melo MI, Aguiar PH, Barreto Filho JB, Leite RC. Prevalence of antibodies to bluetongue, bovine herpesvirus 1 and bovine viral diarrhea/mucosal disease viruses in water buffaloes in Minas Gerais State, Brazil. Rev Elev Med Vet Pays Trop 1996; 49:195-7. [PMID: 9091990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
A serological survey to detect water buffaloes with antibodies to bluetongue virus (BTV), bovine herpesvirus 1 (BHV 1) and bovine viral diarrhea/mucosal disease virus (BVD/MDV) was performed in Minas Gerais State, Brazil. Precipitating antibodies against BTV were detected by the agar gel immunodiffusion test (AGID) in 54.4% of the serum samples tested. Microplate serum-neutralization tests revealed that 14.7% and 52.7% of the water buffaloes had antibodies to BHV 1 and BVD/MDV, respectively. The prevalence of antibodies to BTV in water buffaloes under two years old was significantly lower than in adults.
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Affiliation(s)
- A P Lage
- Departamento de Medicina Veterinária Preventiva, Belo Horizonte, MG, Brasil.
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Lage AP, Godfroid E, Fauconnier A, Burette A, Butzler JP, Bollen A, Glupczynski Y. Diagnosis of Helicobacter pylori infection by PCR: comparison with other invasive techniques and detection of cagA gene in gastric biopsy specimens. J Clin Microbiol 1995; 33:2752-6. [PMID: 8567918 PMCID: PMC228568 DOI: 10.1128/jcm.33.10.2752-2756.1995] [Citation(s) in RCA: 111] [Impact Index Per Article: 3.8] [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: 01/31/2023] Open
Abstract
A PCR assay for the detection of Helicobacter pylori in gastric biopsy specimens with specific primers for ureC gene amplification (herein referred to as ureC PCR) was compared with other routine invasive methods (culture, the rapid-urease test, and Giemsa staining of histological sections) with samples from a group of 104 consecutive dyspeptic patients. Bacteria were found in 40 (38.5%), 38 (36.5%), 36 (34.6%), and 35 (33.7%) of the patients by ureC PCR, culture, the rapid-urease test, and Giemsa stain, respectively. Sixty-three patients had negative cultures, negative histological examinations, and negative rapid-urease test results, and 61 of these patients were also negative by ureC PCR. ureC PCR detected H. pylori in two culture-negative patients. In parallel, a PCR-based assay to detect the H. pylori cytotoxin-associated antigen (cagA) gene, a putative virulence gene, was also developed. To assess the likelihood of detection of H. pylori genes directly from gastric biopsy samples and from the corresponding H. pylori isolates, specimens from 31 patients were subjected to PCR with ureC- and cagA-targeting primers. All 31 biopsy specimens and the corresponding H. pylori isolates were positive in the ureC PCR. H. pylori strains that were cagA positive also gave positive cagA PCR fragments with biopsy specimens from the same patients. All ureC PCR-positive patients were examined; biopsy specimens from 10 of 11 (91.7%) duodenal ulcer patients harbored H. pylori cagA-positive strains, whereas 19 of26 (73%) of those from patients with chronic gastritis only were found to be cagA positive. These findings indicate first that ureC PCR is at least as sensitive as culture for diagnosing H. pylori infection and second that the presence of the H. pylori cagA gene can also be detected directly in biopsy specimens by PCR amplification.
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Affiliation(s)
- A P Lage
- Service de Génétique Appliquée, Université Libre de Bruxelles, Nivelles, Belgium
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Cover TL, Glupczynski Y, Lage AP, Burette A, Tummuru MK, Perez-Perez GI, Blaser MJ. Serologic detection of infection with cagA+ Helicobacter pylori strains. J Clin Microbiol 1995; 33:1496-500. [PMID: 7650174 PMCID: PMC228203 DOI: 10.1128/jcm.33.6.1496-1500.1995] [Citation(s) in RCA: 231] [Impact Index Per Article: 8.0] [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: 01/26/2023] Open
Abstract
Approximately 60% of Helicobacter pylori isolates possess the cagA gene and express its 120- to 140-kDa product (CagA). In this study, the cagA gene was detected in H. pylori isolates from 26 (81.3%) of 32 patients with duodenal ulcers (DU), 17 (68.0%) of 25 patients with gastric ulcers, and 23 (59.0%) of 39 patients with nonulcer dyspepsia (NUD). By Western blotting (immunoblotting) with antiserum to CagA, in vitro CagA expression was demonstrated for 95.5% of cagA+ strains compared with 0% of strains lacking cagA. Sera from patients infected with cagA+ strains (n = 66) reacted with recombinant CagA in an enzyme-linked immunosorbent assay to a significantly greater extent than either sera from patients infected with strains lacking cagA (n = 30) or sera from uninfected persons (n = 25) (P < 0.001). A strain lacking cagA was isolated from eight patients who had serum immunoglobulin G antibodies to CagA, which suggests that these patients were infected with multiple strains. Serum immunoglobulin G antibodies to CagA were present in 87.5, 76.0, and 56.4% of patients with DU, gastric ulcers, and NUD, respectively (odds ratio, 5.41; 95% confidence interval, 1.44 to 24.72; P = 0.004 [DU versus NUD]). These data demonstrate an association between infection with cagA+ H. pylori and the presence of duodenal ulceration and indicate that serologic testing is a sensitive method for detecting infection with cagA+ strains.
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Affiliation(s)
- T L Cover
- Department of Medicine, Vanderbilt University School of Medicine, Nashville, TN 37232-2605, USA
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Castro RS, Leite RC, Abreu JJ, Lage AP, Ferraz IB, Lobato ZI, Balsamão SL. Prevalence of antibodies to selected viruses in bovine embryo donors and recipients from Brazil, and its implications in international embryo trade. Trop Anim Health Prod 1992; 24:173-6. [PMID: 1339004 DOI: 10.1007/bf02359611] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [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: 12/26/2022]
Abstract
The prevalence of serum antibody to enzootic bovine leukosis (EBL), blue-tongue (BT), bovine herpesvirus 1 (BHV 1) and bovine virus diarrhoea (BVD) viruses in bovine embryo donors (D) and recipients (R) from Minas Gerais State, Brazil was investigated. Of 451 sera (130 D plus 321 R) tested for antibodies against EBL virus 104 (23.1%) were positive. Of 410 sera (130 D plus 280 R) tested for antibody to BT, BHV 1 and BVD viruses the respective number of positive sera were 313 (76.3%), 209 (51.0%) and 153 (37.3%). Donors had significantly (Chi-square test, p < 0.05) higher prevalence rates of antibody than recipients to EBL and BVD viruses. The donors were 60 Bos indicus and 70 Bos taurus purebred cows. Antibody to EBL virus was significantly less common among Bos indicus.
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Affiliation(s)
- R S Castro
- Universidade Federal Rural de Pernambuco, Departamento de Medicina Veterinária, Recife, PE, Brazil
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