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Benavides J, González-Warleta M, Arteche-Villasol N, Pérez V, Mezo M, Gutiérrez-Expósito D. Ovine Neosporosis: The Current Global Situation. Animals (Basel) 2022; 12:ani12162074. [PMID: 36009665 PMCID: PMC9405361 DOI: 10.3390/ani12162074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2022] [Revised: 07/17/2022] [Accepted: 08/10/2022] [Indexed: 11/16/2022] Open
Abstract
Simple Summary This review summarizes the current global situation of Neospora caninum infection in sheep by referring to all of the available descriptions of natural ovine neosporosis to date, focusing on epidemiology, clinical signs, lesions, and diagnosis. The data suggest that ovine neosporosis is more prevalent than currently thought, that it has increased in the last few decades, and that it should now be considered in the differential diagnosis when investigating abortion in sheep. Abstract In the past 20 years, Neospora caninum infection in sheep has been reported in at least 31 countries worldwide from all sheep-rearing continents (Europe, Asia, the Americas, Africa, and Oceania), and its role as an abortifacient agent is becoming more evident. Most studies of ovine neosporosis have focused on its epidemiology, based primarily on serological analysis, with only a few studies investigating the actual presence of the parasite by PCR and/or IHC. Individual seroprevalence rates were highly variable between countries, and even between regions within the same country, ranging from 0.0% to 67.4% positive. Furthermore, most of the studies were not directly comparable due to differences in experimental designs, sample sizes, husbandry systems, ecological factors, and serological tests (e.g., IFAT, ELISA, MAT, Western blot). The latter, along with the scarcity of studies on the relevance of N. caninum as an abortifacient agent, may bias the perception of the importance of this disease. This review summarizes the situation of N. caninum infection in sheep using all available published studies describing natural ovine neosporosis. The epidemiology shows that ovine neosporosis is found worldwide, and it poses a relevant risk to the sustainability of sheep flocks.
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Affiliation(s)
- Julio Benavides
- Instituto de Ganadería de Montaña, CSIC-University of Leon, Grulleros, 24346 León, Spain
| | - Marta González-Warleta
- Centro de Investigaciones Agrarias de Mabegondo, Parasitology Laboratory, Axencia Galega da Calidade Alimentaria (AGACAL)-Xunta de Galicia, Ctra, Betanzos a Mesón do Vento km 7, Abegondo, 15318 A Coruña, Spain
| | - Noive Arteche-Villasol
- Instituto de Ganadería de Montaña, CSIC-University of Leon, Grulleros, 24346 León, Spain
- Animal Health Department, Faculty of Veterinary, University of Leon, Campus de Vegazana s/n, 24071 León, Spain
| | - Valentín Pérez
- Instituto de Ganadería de Montaña, CSIC-University of Leon, Grulleros, 24346 León, Spain
- Animal Health Department, Faculty of Veterinary, University of Leon, Campus de Vegazana s/n, 24071 León, Spain
| | - Mercedes Mezo
- Centro de Investigaciones Agrarias de Mabegondo, Parasitology Laboratory, Axencia Galega da Calidade Alimentaria (AGACAL)-Xunta de Galicia, Ctra, Betanzos a Mesón do Vento km 7, Abegondo, 15318 A Coruña, Spain
| | - Daniel Gutiérrez-Expósito
- Instituto de Ganadería de Montaña, CSIC-University of Leon, Grulleros, 24346 León, Spain
- Animal Health Department, Faculty of Veterinary, University of Leon, Campus de Vegazana s/n, 24071 León, Spain
- Correspondence:
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Souza LR, Carvalho MPN, Lopes CEB, Lopes MC, Campos BH, Teixeira ÉPT, Mendes EJ, Santos LP, Caixeta EA, Costa EA, Cunha JLR, Fraiha ALS, Silva ROS, Ramos CP, Varaschin MS, Ecco R. Outbreak of canine distemper and coinfections in a maned wolf (Chrysocyon brachyurus) and in three giant anteaters (Myrmecophaga tridactyla). Braz J Microbiol 2022; 53:1731-1741. [PMID: 35864379 DOI: 10.1007/s42770-022-00783-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2021] [Accepted: 06/10/2022] [Indexed: 11/02/2022] Open
Abstract
Canine distemper outbreak and coinfections in three giant anteaters and in a maned wolf has been described. Three giant anteaters developed respiratory and digestive clinical signs after the introduction of a maned wolf to a Wildlife Rehabilitation Center. The maned wolf and two anteaters died, and one anteater was euthanized. Post mortem and histopathologic exams revealed lesions associated with numerous intraepithelial inclusion bodies, mainly in the respiratory and digestive systems. Infection by distemper virus was confirmed in all animals by RT-PCR and gene sequencing, which revealed the Europe 1/ South America 1 strain, closely related to the strain from Canis familiaris. In addition to distemper, the animals had other comorbidities, such as toxoplasmosis and salmonellosis in the maned wolf and cutaneous candidiasis in an anteater. Considering the chronology of clinical manifestation in both species and the viral characterization, it is possible that the maned wolf was the source of infection to the anteaters. This study demonstrates the importance of implementing biosecurity measures in enclosures that house animals of different species, highlighting the importance of quarantine before introduction of new animals into the same environment.
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Affiliation(s)
- Lucas R Souza
- Sector of Animal Pathology, Department of Clinic and Surgery, Veterinary School, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, Belo Horizonte, Minas Gerais, 31270-901, Brazil
| | - Marcelo P N Carvalho
- Department of Clinic and Surgery, Veterinary School, Sector of Clinic, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, Belo Horizonte, Minas Gerais, 31270-901, Brazil
| | - Carlos E B Lopes
- Sector of Animal Pathology, Department of Clinic and Surgery, Veterinary School, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, Belo Horizonte, Minas Gerais, 31270-901, Brazil
| | - Marcelo C Lopes
- Sector of Animal Pathology, Department of Clinic and Surgery, Veterinary School, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, Belo Horizonte, Minas Gerais, 31270-901, Brazil
| | - Bruna H Campos
- Department of Clinic and Surgery, Veterinary School, Sector of Clinic, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, Belo Horizonte, Minas Gerais, 31270-901, Brazil
| | - Érika P T Teixeira
- Instituto Estadual de Florestas (IEF), Rodovia João Paulo II, 4143, Bairro Serra Verde, Belo Horizonte, Minas Gerais, 31630-900, Brazil
| | - Ellen J Mendes
- Instituto Estadual de Florestas (IEF), Rodovia João Paulo II, 4143, Bairro Serra Verde, Belo Horizonte, Minas Gerais, 31630-900, Brazil
| | - Leidilene P Santos
- Department of Preventive Veterinary Medicine, Veterinary School, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, Belo Horizonte, Minas Gerais, 31270-901, Brazil
| | - Eduardo A Caixeta
- Department of Preventive Veterinary Medicine, Veterinary School, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, Belo Horizonte, Minas Gerais, 31270-901, Brazil
| | - Erica A Costa
- Department of Preventive Veterinary Medicine, Veterinary School, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, Belo Horizonte, Minas Gerais, 31270-901, Brazil
| | - João L R Cunha
- Department of Preventive Veterinary Medicine, Veterinary School, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, Belo Horizonte, Minas Gerais, 31270-901, Brazil
| | - Ana L S Fraiha
- Department of Preventive Veterinary Medicine, Veterinary School, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, Belo Horizonte, Minas Gerais, 31270-901, Brazil
| | - Rodrigo O S Silva
- Department of Preventive Veterinary Medicine, Veterinary School, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, Belo Horizonte, Minas Gerais, 31270-901, Brazil
| | - Carolina P Ramos
- Department of Preventive Veterinary Medicine, Veterinary School, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, Belo Horizonte, Minas Gerais, 31270-901, Brazil
| | - Mary S Varaschin
- Sector of Animal Pathology, Universidade Federal de Lavras, Lavras, Minas Gerais, 37200-900, Brazil
| | - Roselene Ecco
- Sector of Animal Pathology, Department of Clinic and Surgery, Veterinary School, Universidade Federal de Minas Gerais, Avenida Antônio Carlos, 6627, Belo Horizonte, Minas Gerais, 31270-901, Brazil.
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Débare H, Moiré N, Ducournau C, Schmidt J, Laakmann JD, Schwarz RT, Dimier-Poisson I, Debierre-Grockiego F. Neospora caninum glycosylphosphatidylinositols used as adjuvants modulate cellular immune responses induced in vitro by a nanoparticle-based vaccine. Cytokine 2021; 144:155575. [PMID: 34000479 DOI: 10.1016/j.cyto.2021.155575] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 04/15/2021] [Accepted: 05/03/2021] [Indexed: 11/24/2022]
Abstract
Neospora caninum causes abortion in ruminants, leading to important economic losses and no efficient treatment or vaccine against neosporosis is available. Considering the complexity of the strategies developed by intracellular apicomplexan parasites to escape immune system, future vaccine formulations should associate the largest panel of antigens and adjuvants able to better stimulate immune responses than natural infection. A mucosal vaccine, constituted of di-palmitoyl phosphatidyl glycerol-loaded nanoparticles (DGNP) and total extract (TE) of soluble antigens of Toxoplasma gondii, has demonstrated its efficacy, decreasing drastically the parasite burden. Here, DGNP were loaded with N. caninum TE and glycosylphosphatidylinositol (GPI) of N. caninum as Toll-like receptor (TLR) adjuvant able to induce specific cellular and humoral immune responses. Activation of TLR2 and TLR4 signalling pathway in HEK reporter cells induced by GPI was abrogated after its incorporation into DGNP. However, in murine bone marrow-derived dendritic cells, an adjuvant effect of GPI was observed with higher levels of interleukin (IL)-1β, reduced levels of IL-6, IL-12p40 and IL-10, and decreased expression of major histocompatibility complex (MHC) molecules. GPI also modulated the responses of bovine peripheral blood mononuclear cells, by increasing the production of IFN-γ and by decreasing the expression of MHC molecules. Altogether, these results suggest that GPI delivered by the DGNP might modulate cell responses through the activation of an intracellular pathway of signalisation in a TLR-independent manner. In vivo experiments are needed to confirm the potent adjuvant properties of N. caninum GPI in a vaccine strategy against neosporosis.
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Affiliation(s)
| | | | | | - Jörg Schmidt
- Institut für Virologie, AG Parasitologie, Philipps-Universität Marburg, 35043 Marburg, Germany
| | - Jan-David Laakmann
- Institut für Virologie, AG Parasitologie, Philipps-Universität Marburg, 35043 Marburg, Germany
| | - Ralph T Schwarz
- Institut für Virologie, AG Parasitologie, Philipps-Universität Marburg, 35043 Marburg, Germany; Univ. Lille, CNRS, UMR 8576, Unité de Glycobiologie Structurale et Fonctionnelle, 59655 Villeneuve d'Ascq, France
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Pereira KAG, de Sousa RS, Varaschin MS, Becker APBB, Monteiro ALG, de Oliveira Koch M, Costa RC, Laskoski LM, Galindo CM, de Cristo TG, da Fonseca FM, Locatelli-Dittrich R. Transplacental transmission of Neospora caninum to lambs in successive pregnancies of naturally infected sheep in Southern Brazil. Vet Parasitol Reg Stud Reports 2021; 23:100537. [PMID: 33678390 DOI: 10.1016/j.vprsr.2021.100537] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 01/16/2021] [Accepted: 01/16/2021] [Indexed: 11/16/2022]
Abstract
This study aims to report the detection of N. caninum DNA in a newborn lamb (1) with neurological signs and congenital neosporosis and in a stillborn lamb (2), both born from the same ewe in a herd of Southern Brazil. The lambs were born during different pregnancies of a Suffolk ewe seropositive to N. caninum and seronegative to T. gondii. Histopathological lesions were observed only in the central nervous system of the lambs. The newborn lamb (1) showed mild and focal gliosis in the frontal lobe. In the hippocampal region of the stillborn lamb (2), lymphoplasmacytic perivascular cuffs and N. caninum cysts were observed in the cytoplasm of neurons and confirmed by IHC. PCR was performed using brain samples to detect the protozoa N. caninum and Toxoplasma gondii. The infection with N. caninum was confirmed in the newborn lamb (1) by PCR and in the stillborn lamb (2) by histopathology, immunohistochemistry, and PCR tests.
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Affiliation(s)
- Kamila Alcalá Gonçalves Pereira
- Veterinarian, Sector of Agrarian Sciences, Federal University of Paraná, Rua dos Funcionários, 1540, Juvevê, Curitiba CEP:80035-060, Paraná, Brazil
| | - Renato Silva de Sousa
- Department of Veterinary Medicine, Federal University of Paraná, Curitiba, Paraná, Brazil, Rua dos Funcionários, 1540, Juvevê, Curitiba CEP:80035-060, Paraná, Brazil
| | - Mary Suzan Varaschin
- Department of Veterinary Medicine, Federal University of Lavras, Caixa postal 3037, Lavras CEP 37200-000, Minas Gerais, Brazil
| | - Ana Paula Brenner Busch Becker
- Veterinarian, Sector of Agrarian Sciences, Federal University of Paraná, Rua dos Funcionários, 1540, Juvevê, Curitiba CEP:80035-060, Paraná, Brazil
| | - Alda Lúcia Gomes Monteiro
- Department of Animal Science, Federal University of Paraná, Rua dos Funcionários, 1540, Juvevê, Curitiba CEP:80035-060, Paraná, Brazil
| | - Marília de Oliveira Koch
- Veterinarian, Sector of Agrarian Sciences, Federal University of Paraná, Rua dos Funcionários, 1540, Juvevê, Curitiba CEP:80035-060, Paraná, Brazil
| | - Rafael Carneiro Costa
- Department of Veterinary Medicine, Federal University of Lavras, Caixa postal 3037, Lavras CEP 37200-000, Minas Gerais, Brazil
| | - Luciane Maria Laskoski
- Veterinarian, Sector of Agrarian Sciences, Federal University of Paraná, Rua dos Funcionários, 1540, Juvevê, Curitiba CEP:80035-060, Paraná, Brazil.
| | - Claudia Martins Galindo
- Veterinarian, Sector of Agrarian Sciences, Federal University of Paraná, Rua dos Funcionários, 1540, Juvevê, Curitiba CEP:80035-060, Paraná, Brazil
| | - Thierry Grima de Cristo
- Veterinarian, Sector of Agrarian Sciences, Federal University of Paraná, Rua dos Funcionários, 1540, Juvevê, Curitiba CEP:80035-060, Paraná, Brazil
| | - Flávia Moreira da Fonseca
- Veterinarian, Sector of Agrarian Sciences, Federal University of Paraná, Rua dos Funcionários, 1540, Juvevê, Curitiba CEP:80035-060, Paraná, Brazil
| | - Rosangela Locatelli-Dittrich
- Department of Veterinary Medicine, Federal University of Paraná, Curitiba, Paraná, Brazil, Rua dos Funcionários, 1540, Juvevê, Curitiba CEP:80035-060, Paraná, Brazil
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Endogenous transplacental transmission of Neospora caninum in successive generations of congenitally infected goats. Vet Parasitol 2020; 284:109191. [PMID: 32739750 DOI: 10.1016/j.vetpar.2020.109191] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 07/18/2020] [Accepted: 07/19/2020] [Indexed: 11/20/2022]
Abstract
Neospora caninum is a protozoan that is considered an important agent of reproductive disorders in ruminants worldwide, and vertical transmission is the main form of infection and maintenance of neosporosis in herds. In goats, there have been no studies that have evaluated the transmission of N. caninum between successive generations. Thus, the objective of this study was to evaluate, through IFAT and PCR, the endogenous transplacental transmission of N. caninum in up to five generations of six families of dairy goats naturally infected by the parasite and whether it was possible for dairy goats to become free of infection over successive generations. Ninety-five serum samples from positive animals and 75 samples from negative animals were analyzed for N. caninum. Of the 95 samples analyzed, 93 contained anti-N. caninum antibodies (97.8 %). Titers of anti-N. caninum antibodies varied (increasing or decreasing) in the offspring; however, with an increase in the number of the goat generations, the offspring tended to have lower titers (p = 0.021) at the day of birth. Reproductive disorders such as abortions, stillbirth or fetal retention occurred at a rate of 10.4 % and were not influenced by the mother's titer of anti-N. caninum antibodies at the day of parturition or abortion. The results showed that infection by N. caninum persists throughout generations in congenitally infected goats.
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From Signaling Pathways to Distinct Immune Responses: Key Factors for Establishing or Combating Neospora caninum Infection in Different Susceptible Hosts. Pathogens 2020; 9:pathogens9050384. [PMID: 32429367 PMCID: PMC7281608 DOI: 10.3390/pathogens9050384] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2020] [Revised: 05/12/2020] [Accepted: 05/13/2020] [Indexed: 12/12/2022] Open
Abstract
: Neospora caninum is an intracellular protozoan parasite affecting numerous animal species. It induces significant economic losses because of abortion and neonatal abnormalities in cattle. In case of infection, the parasite secretes numerous arsenals to establish a successful infection in the host cell. In the same context but for a different purpose, the host resorts to different strategies to eliminate the invading parasite. During this battle, numerous key factors from both parasite and host sides are produced and interact for the maintaining and vanishing of the infection, respectively. Although several reviews have highlighted the role of different compartments of the immune system against N. caninum infection, each one of them has mostly targeted specific points related to the immune component and animal host. Thus, in the current review, we will focus on effector molecules derived from the host cell or the parasite using a comprehensive survey method from previous reports. According to our knowledge, this is the first review that highlights and discusses immune response at the host cell-parasite molecular interface against N. caninum infection in different susceptible hosts.
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Costa RC, Mesquita LP, de Oliveira IM, Zannato DA, Emanuel Dos Santos Mesquita L, Biihrer DA, de Oliveira Massoco Salles Gomes C, Varaschin MS, Maiorka PC. The pathogenicity of two Neospora caninum goat strains in a BALB/c mouse model. Exp Parasitol 2019; 205:107736. [PMID: 31442455 DOI: 10.1016/j.exppara.2019.107736] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Revised: 06/25/2019] [Accepted: 08/02/2019] [Indexed: 01/14/2023]
Abstract
Goats are frequently described as an intermediate host for the protozoan Neospora caninum, manifesting the disease mainly by recurrent abortions with placentitis and encephalitis in fetuses. Several reports of natural and experimental infections in cattle and mice show differences in the immune response, and the outcome of the infection can be variable depending on the species affected and by the behavior of the infective strain. This study describes for the first time two Neospora caninum strains isolated from naturally infected goats from the state of Minas Gerais, Brazil. One placenta and one brain from different goats were processed for a first bioassay in gerbils (Meriones unguiculatus). Subsequently, a second bioassay was performed by inoculating the processed brain samples from gerbils into Interferon gamma (IFN-γ) knockout mice (KO mice). Tachyzoites collected from the peritoneal fluid of the KO mice were inoculated into VERO cell monolayers, where they presented a very slow growth rate. The tachyzoites were also inoculated into BALB/c mice with a dose of 106 tachyzoites per animal. After a 5-week follow up, the animals infected with both of the strains developed a strong polarized Th1 response with increased serum and spleen gene expression levels of pro-inflammatory cytokines (mainly IFN-γ and TNF-α) in the first week. Tissue lesions were mild in the animals infected with both strains. Despite the strong immune response preventing an infection in the visceral organs, the parasite was able to reach the brain, causing progressive brain lesions from the second to fifth week post infection. The NC-goat1-infected mice presented with severe meningoencephalitis, but the NC-goat2-infected animals had considerable histological brain lesions only at week 5. Immunohistochemical analysis of the mouse brains revealed a different pattern of inflammatory cells compared to the naturally infected goats. A severe inflammatory infiltrate of CD3+ T lymphocytes was found in the NC-goat1-infected mice. A more discrete infiltrate of CD3+ T cells was found in the NC-goat2-infected animals. Additionally, IBA1 IHC revealed an intense microglial reaction and monocyte perivascular cuffs in the NC-goat1-infected animals and lower microglia/monocyte infiltrates in the NC-goat2-infected mice. This work contributes knowledge on the pathogenicity of new Neospora caninum strains in mice, comparable with other well-established mouse models of the disease, and demonstrates the importance of studying goats as an intermediate host of this parasite.
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Affiliation(s)
- Rafael Carneiro Costa
- Department of Pathology- School of Veterinary Medicine and and Animal Sciences, FMVZ-USP, São Paulo, SP, Brazil.
| | - Leonardo Pereira Mesquita
- Department of Pathology- School of Veterinary Medicine and and Animal Sciences, FMVZ-USP, São Paulo, SP, Brazil.
| | | | - Dennis Albert Zannato
- Department of Pathology- School of Veterinary Medicine and and Animal Sciences, FMVZ-USP, São Paulo, SP, Brazil.
| | | | - Daniel Arrais Biihrer
- Department of Pathology- School of Veterinary Medicine and and Animal Sciences, FMVZ-USP, São Paulo, SP, Brazil.
| | | | - Mary Suzan Varaschin
- Department of Veterinary Medicine- Federal University of Lavras- UFLA, Lavras, MG, Brazil.
| | - Paulo César Maiorka
- Department of Pathology- School of Veterinary Medicine and and Animal Sciences, FMVZ-USP, São Paulo, SP, Brazil.
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Mesquita E, Oliveira J, Silva G, Torres S, Oliveira A, Silva Júnior V, Mota R, Amorim M. Imunodetecção de Toxoplasma gondii em tecido placentário de cabras naturalmente infectadas. ARQ BRAS MED VET ZOO 2019. [DOI: 10.1590/1678-4162-9797] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
RESUMO A imuno-histoquímica (IHQ) é considerada uma ferramenta rápida e precisa para a identificação de protozoários, como Toxoplasma gondii, em tecidos fetais e placentários. Neste estudo foi avaliada a imunodetecção de Toxoplasma gondii em tecido placentário de cabras naturalmente infectadas. Foram coletadas e analisadas 80 amostras de placentas de cabras procedentes de único rebanho com sorologia positiva para T. gondii na técnica de ELISA. Na histopatologia, 27/80 amostras apresentaram lesões sugestivas de infecção por protozoários. Após a avaliação histopatológica, procedeu-se à realização da técnica de imuno-histoquímica, obtendo-se 85,2% (23/27) de amostras com marcação positiva. A imunodetecção ocorreu no epitélio de revestimento das vilosidades coriônicas e foi classificada de acordo com o grau de intensidade da imunomarcação. Também foi evidenciada imunomarcação no interior dos vasos sanguíneos fetais em 8,69% (2/23) das amostras. Este estudo demonstrou que a técnica de IHQ se comportou como uma ferramenta valiosa no diagnóstico da infeção por T. gondii em tecido placentário de cabras naturalmente infectadas e complementou, de forma decisiva, o diagnóstico, além de agregar maior valor aos resultados obtidos nas análises histopatológica e sorológica.
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Affiliation(s)
| | | | | | | | | | | | - R.A. Mota
- Universidade Federal Rural de Pernambuco, Brazil
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Yang Z, Wei Z, Hermosilla C, Taubert A, He X, Wang X, Gong P, Li J, Zhang X. Caprine Monocytes Release Extracellular Traps against Neospora caninum In Vitro. Front Immunol 2018; 8:2016. [PMID: 29403487 DOI: 10.3389/fimmu.2017.02016] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Accepted: 12/29/2017] [Indexed: 12/23/2022] Open
Abstract
Neospora caninum is an obligate intracellular apicomplexan parasite that causes reproductive loss and severe economic losses in dairy and goat industry. In the present study, we aim to investigate the effects of N. caninum tachyzoites on the release of extracellular traps (ETs) in caprine monocytes and furthermore elucidated parts of its molecular mechanisms. N. caninum tachyzoite-induced monocytes-derived ETs formation was detected by scanning electron microscopy. H3 and myeloperoxidase (MPO) within monocyte-ETs structures were examined using laser scanning confocal microscopy analyses. The results showed that N. caninum tachyzoites were not only able to trigger ETs formation in caprine monocytes, but also that monocyte-released ETs were capable of entrapping viable tachyzoites. Histones and MPO were found to be decorating the DNA within the monocytes derived-ETs structures thus proving the classical components of ETs. Furthermore, inhibitors of NADPH oxidase-, MPO-, ERK 1/2-, or p38 MAPK-signaling pathway significantly decreased N. caninum tachyzoite-triggered caprine monocyte-derived ETosis. This is the first report of ETs release extruded from caprine monocytes after N. caninum exposure and thus showing that this early innate immune effector mechanism might be relevant during the acute phase of caprine neosporosis.
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Affiliation(s)
- Zhengtao Yang
- College of Basic Medical Sciences, Jilin University, Changchun, China.,College of Veterinary Medicine, Jilin University, Changchun, China
| | - Zhengkai Wei
- College of Veterinary Medicine, Jilin University, Changchun, China
| | - Carlos Hermosilla
- Faculty of Veterinary Medicine, Institute of Parasitology, Justus Liebig University Giessen, Giessen, Germany
| | - Anja Taubert
- Faculty of Veterinary Medicine, Institute of Parasitology, Justus Liebig University Giessen, Giessen, Germany
| | - Xuexiu He
- College of Veterinary Medicine, Jilin University, Changchun, China
| | - Xiaocen Wang
- College of Veterinary Medicine, Jilin University, Changchun, China
| | - Pengtao Gong
- College of Veterinary Medicine, Jilin University, Changchun, China
| | - Jianhua Li
- College of Veterinary Medicine, Jilin University, Changchun, China
| | - Xichen Zhang
- College of Basic Medical Sciences, Jilin University, Changchun, China.,College of Veterinary Medicine, Jilin University, Changchun, China
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Costa RC, Mesquita LP, Nunes MVL, Oliveira IM, Oliveira LFS, Souza AR, Maiorka PC, Varaschin MS. Neospora caninum bioassay in gerbils using placental tissues from naturally infected goats. Vet Parasitol 2017; 249:70-73. [PMID: 29279089 DOI: 10.1016/j.vetpar.2017.11.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Revised: 10/25/2017] [Accepted: 11/20/2017] [Indexed: 11/28/2022]
Abstract
Neospora caninum is one of the main agents that causes abortions in cattle worldwide. However, little is known about the pathogenesis of neosporosis in small ruminants, especially goats. Gerbils (Meriones unguiculatus) have been used as a model for neosporosis, and this species is highly susceptible to infection by bovine N. caninum strains. The present study aimed to evaluate the susceptibility of gerbils to a N. caninum isolate from goats. The placentas were obtained from naturally infected goats, that presented with mild to severe lymphoplasmacytic and histiocytic infiltrate, foci of necrosis, calcification and protozoan-like structures. Immunosuppressed gerbils bioassayed with N. caninum-infected placental tissues showed severe neurological signs. Microscopic lesions in these gerbils were characterized by encephalitis, myocarditis, myositis and pancreatitis. These lesions were often associated with a small to moderate number of N. caninum tachyzoites, confirmed by immunohistochemistry and PCR. This is the first report showing that goat N. caninum strains could infect immunocompetent gerbils and cause severe lesions and clinical signs in immunosuppressed gerbils.
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Affiliation(s)
- R C Costa
- Department of Pathology, University of Sao Paulo, Sao Paulo, Brazil; Department of Veterinary Medicine, Federal University of Lavras, Lavras, Brazil.
| | - L P Mesquita
- Department of Pathology, University of Sao Paulo, Sao Paulo, Brazil
| | - M V L Nunes
- Department of Veterinary Medicine, Federal University of Lavras, Lavras, Brazil
| | - I M Oliveira
- Department of Veterinary Medicine, Federal University of Lavras, Lavras, Brazil
| | - L F S Oliveira
- Department of Veterinary Medicine, Federal University of Lavras, Lavras, Brazil
| | - Alinne R Souza
- Department of Veterinary Medicine, Federal University of Lavras, Lavras, Brazil
| | - P C Maiorka
- Department of Pathology, University of Sao Paulo, Sao Paulo, Brazil
| | - M S Varaschin
- Department of Veterinary Medicine, Federal University of Lavras, Lavras, Brazil
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11
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Andrade EF, Orlando DR, Gomes JAS, Foureaux RDC, Costa RC, Varaschin MS, Rogatto GP, de Moura RF, Pereira LJ. Exercise attenuates alveolar bone loss and anxiety-like behaviour in rats with periodontitis. J Clin Periodontol 2017; 44:1153-1163. [DOI: 10.1111/jcpe.12794] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/02/2017] [Indexed: 12/15/2022]
Affiliation(s)
- Eric F. Andrade
- Department of Veterinary Sciences; Federal University of Lavras; Lavras Brazil
| | - Débora R. Orlando
- Department of Agricultural Sciences; Federal University of Jequitinhonha and Mucuri Valleys; Unaí Brazil
| | - Júlia A. S. Gomes
- Department of Biological Sciences; Federal University of Minas Gerais; Belo Horizonte Brazil
| | | | - Rafael C. Costa
- Department of Veterinary Pathology; Federal University of Lavras; Lavras Brazil
| | - Mary S. Varaschin
- Department of Veterinary Pathology; Federal University of Lavras; Lavras Brazil
| | - Gustavo P. Rogatto
- Department of Physical Education; Federal University of Lavras; Lavras Brazil
| | | | - Luciano J. Pereira
- Department of Health Sciences; Federal University of Lavras; Lavras Brazil
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12
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Villagra-Blanco R, Silva LMR, Gärtner U, Wagner H, Failing K, Wehrend A, Taubert A, Hermosilla C. Molecular analyses on Neospora caninum-triggered NETosis in the caprine system. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2017; 72:119-127. [PMID: 28254622 DOI: 10.1016/j.dci.2017.02.020] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Revised: 02/22/2017] [Accepted: 02/22/2017] [Indexed: 06/06/2023]
Abstract
Neospora caninum is an obligate intracellular protozoan parasite causing serious reproductive disorders in large and small ruminants worldwide. Polymorphonuclear neutrophils (PMN) react against multiple invading pathogens through different mechanisms including the release of neutrophil extracellular traps (NETs). Here, in vitro interactions of caprine PMN and N. caninum tachyzoites were studied. Scanning electron microscopic- and immunofluorescence-analyses demonstrated that caprine PMN undergo NETosis upon contact with tachyzoites of N. caninum, extruding filaments that entrap parasites. Detailed co-localization studies of N. caninum tachyzoite-induced NETs revealed the presence of PMN-derived DNA being decorated with histones (H1, H2A/H2B, H3,H4) and neutrophil elastase (NE) corroborating the molecular characteristics of classical mammalian NETs. As a new result for parasite-induced NETosis, we identified pentraxin and cathepsin B in N. caninum-triggered NETs. Nonetheless, functional inhibition assays revealed that during caprine NET formation triggered by N. caninum different molecular signaling pathways are induced, when compared to other apicomplexan parasites or host species. As such, N. caninum-induced NETosis appears to be influenced by MPO but independent of NADPH oxidase, SOCE, ERK1/2 and p38 MAPK activities. Furthermore, the inhibition of PMN autophagy via blockage of the PI3K-mediated signaling pathway failed to influence tachyzoite-induced NETosis. Since N. caninum-tachyzoites induced caprine NETosis, this effector mechanism should be considered as an early host immune response during acute caprine neosporosis.
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Affiliation(s)
- R Villagra-Blanco
- Institute of Parasitology, Faculty of Veterinary Medicine, Justus Liebig University Giessen, Giessen 35392, Germany; Clinic for Obstetrics, Gynecology and Andrology, Faculty of Veterinary Medicine, Justus Liebig University Giessen, Giessen 35392, Germany.
| | - L M R Silva
- Institute of Parasitology, Faculty of Veterinary Medicine, Justus Liebig University Giessen, Giessen 35392, Germany
| | - U Gärtner
- Institute of Anatomy and Cell Biology, Justus Liebig University Giessen, Giessen 35392, Germany
| | - H Wagner
- Clinic for Obstetrics, Gynecology and Andrology, Faculty of Veterinary Medicine, Justus Liebig University Giessen, Giessen 35392, Germany
| | - K Failing
- Unit for Biomathematics and Data Processing, Faculty of Veterinary Medicine, Justus Liebig University Giessen, Giessen 35392, Germany
| | - A Wehrend
- Clinic for Obstetrics, Gynecology and Andrology, Faculty of Veterinary Medicine, Justus Liebig University Giessen, Giessen 35392, Germany
| | - A Taubert
- Institute of Parasitology, Faculty of Veterinary Medicine, Justus Liebig University Giessen, Giessen 35392, Germany
| | - C Hermosilla
- Institute of Parasitology, Faculty of Veterinary Medicine, Justus Liebig University Giessen, Giessen 35392, Germany
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13
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Villagra-Blanco R, Silva LMR, Muñoz-Caro T, Yang Z, Li J, Gärtner U, Taubert A, Zhang X, Hermosilla C. Bovine Polymorphonuclear Neutrophils Cast Neutrophil Extracellular Traps against the Abortive Parasite Neospora caninum. Front Immunol 2017; 8:606. [PMID: 28611772 PMCID: PMC5447047 DOI: 10.3389/fimmu.2017.00606] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2016] [Accepted: 05/08/2017] [Indexed: 01/01/2023] Open
Abstract
Neospora caninum represents a relevant apicomplexan parasite causing severe reproductive disorders in cattle worldwide. Neutrophil extracellular trap (NET) generation was recently described as an efficient defense mechanism of polymorphonuclear neutrophils (PMN) acting against different parasites. In vitro interactions of bovine PMN with N. caninum were analyzed at different ratios and time spans. Extracellular DNA staining was used to illustrate the typical molecules of NETs [i.e., histones (H3), neutrophil elastase (NE), myeloperoxidase (MPO), pentraxin] via antibody-based immunofluorescence analyses. Functional inhibitor treatments were applied to reveal the role of several enzymes [NADPH oxidase (NOX), NE, MPO, PAD4], ATP-dependent P2Y2 receptor, store-operated Ca++entry (SOCE), CD11b receptor, ERK1/2- and p38 MAPK-mediated signaling pathway in tachyzoite-triggered NETosis. N. caninum tachyzoites triggered NETosis in a time- and dose-dependent manner. Scanning electron microscopy analyses revealed NET structures being released by bovine PMN and entrapping tachyzoites. N. caninum-induced NET formation was found not to be NOX-, NE-, MPO-, PAD4-, ERK1/2-, and p38 MAP kinase-dependent process since inhibition of these enzymes led to a slight decrease of NET formation. CD11b was also identified as a neutrophil receptor being involved in NETosis. Furthermore, N. caninum-triggered NETosis depends on Ca++ influx as well as neutrophil metabolism since both the inhibition of SOCE and of P2Y2-mediated ATP uptake diminished NET formation. Host cell invasion assays indicated that PMN-derived NETosis hampered tachyzoites from active host cell invasion, thereby inhibiting further intracellular replication. NET formation represents an early and effective mechanism of response of the innate immune system, which might reduce initial infection rates during the acute phase of cattle neosporosis.
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Affiliation(s)
| | - Liliana M R Silva
- Institute of Parasitology, Justus Liebig University Giessen, Giessen, Germany
| | - Tamara Muñoz-Caro
- Institute of Parasitology, Justus Liebig University Giessen, Giessen, Germany
| | - Zhengtao Yang
- College of Veterinary Medicine, Jilin University, Changchun, China
| | - Jianhua Li
- College of Veterinary Medicine, Jilin University, Changchun, China
| | - Ulrich Gärtner
- Institute of Anatomy and Cell Biology, Justus Liebig University Giessen, Giessen, Germany
| | - Anja Taubert
- Institute of Parasitology, Justus Liebig University Giessen, Giessen, Germany
| | - Xichen Zhang
- College of Veterinary Medicine, Jilin University, Changchun, China
| | - Carlos Hermosilla
- Institute of Parasitology, Justus Liebig University Giessen, Giessen, Germany
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14
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Approaches for the vaccination and treatment of Neospora caninum infections in mice and ruminant models. Parasitology 2015; 143:245-59. [PMID: 26626124 DOI: 10.1017/s0031182015001596] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Neospora caninum is a leading cause of abortion in cattle, and is thus an important veterinary health problem of high economic significance. Vaccination has been considered a viable strategy to prevent bovine neosporosis. Different approaches have been investigated, and to date the most promising results have been achieved with live-attenuated vaccines. Subunit vaccines have also been studied, and most of them represented components that are functionally involved in (i) the physical interaction between the parasite and its host cell during invasion or (ii) tachyzoite-to-bradyzoite stage conversion. Drugs have been considered as an option to limit the effects of vertical transmission of N. caninum. Promising results with a small panel of compounds in small laboratory animal models indicate the potential value of a chemotherapeutical approach for the prevention of neosporosis in ruminants. For both, vaccines and drugs, the key for success in preventing vertical transmission lies in the application of bioactive compounds that limit parasite proliferation and dissemination, without endangering the developing fetus not only during an exogenous acute infection but also during recrudescence of a chronic infection. In this review, the current status of vaccine and drug development is presented and novel strategies against neosporosis are discussed.
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