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1.
Obes Surg ; 34(5): 1885-1908, 2024 May.
Article in English | MEDLINE | ID: mdl-38485892

ABSTRACT

Obesity is a worldwide epidemic, and bariatric surgery has become increasingly popular due to its effectiveness in treating it. Therefore, understanding this area is of paramount importance. This article aims to provide an understanding of the development of the topic related to procedures, content, data, and status. To achieve this objective, a literature review and a bibliometric analysis were conducted. The methods provided insight into the current state and relevant topics over time. In conclusion, the article provided the identification of the transformation of the research field, initially focused only on physical aspects, to a more complex approach, which also incorporates psychological and social aspects and the correlation between obesity, bariatric surgery, and quality of life.


Subject(s)
Bariatric Surgery , Obesity, Morbid , Humans , Bariatric Surgery/methods , Obesity/surgery , Obesity, Morbid/surgery , Physical Examination , Quality of Life
2.
Virus Genes ; 52(3): 372-8, 2016 Jun.
Article in English | MEDLINE | ID: mdl-26995219

ABSTRACT

Bovine herpesvirus 4 (BoHV-4) is a gammaherpesvirus, belonging to the Rhadinovirus genus, which is increasingly associated with various problems of the reproductive tract of cattle. In Argentina, analysis of BoHV-4 strains isolated from cervico-vaginal mucus of aborted cows revealed a high genetic divergence among strains, which could be classified in three different groups: Genotype 1 comprises Movar-like strains (European prototype), Genotype 2 includes DN599-like strains (American prototype) and Genotype 3 corresponds to a novel genotype group. Understanding the replication behavior in cell cultures and the molecular characteristics of this pathogen of cattle is critical for the rational design of in vitro experiments. The aim of this work was to quantitatively evaluate the replication properties of different Argentinean BoHV-4 strains and to characterize their phylogenetic relationships. Significant differences were evident among the virus titers of the different BoHV-4 isolates in vitro. The most conserved gene was the major capsid protein (ORF25). The glycoprotein B (gB), glycoprotein H (gH), and thymidine kinsase (TK) genes displayed both synonymous and non-synonymous substitutions, with the highest diversity observed for gB, which displayed amino acid substitutions in 24 out of the 178 positions examined. Strains 09/759, 12/512, and 07/568 presented a deletion encompassing amino acid position 27 to 35, whereas strains 07/435 and 09/227 had a deletion from position 28 to 35. Two strains, 07/435 and 09/227, also displayed the highest divergence compared to the other strains analyzed. This study provides information about the in vitro replication and behavior of nine field isolates of BoHV-4. These findings are relevant since available information on the in vitro growth characteristics of BoHV-4 strains is scarce. The results from this study may also be useful for establishing comparisons with other related viruses.


Subject(s)
Herpesvirus 4, Bovine/isolation & purification , Herpesvirus 4, Bovine/physiology , Virus Replication/genetics , Animals , Argentina , Cattle , Cattle Diseases/virology , Cell Line , DNA, Viral/genetics , Female , Genetic Variation , Genotype , Herpesviridae Infections/veterinary , Herpesviridae Infections/virology , Herpesvirus 4, Bovine/genetics , Phylogeny , Thymidine Kinase/genetics , Vagina/virology , Vaginal Smears/veterinary , Viral Envelope Proteins/genetics
3.
UNOPAR Cient., Ciênc. biol. saude ; 17(4): 223-226, out. 2015. ilus
Article in Portuguese | LILACS-Express | LILACS | ID: lil-767242

ABSTRACT

As doenças transmitidas por alimentos-DTA são consideradas um dos mais sérios problemas de saúde pública, sendo os sucos de frutas grandes veículos de contaminação microbiana. As principais causas de DTA podem ser através da superfície externa do fruto, a higienização inadequada de equipamentos e principalmente, a água de preparo, podendo ser portadora de diversos micro-organismos. Este artigo teve como objetivo avaliar as características microbiológicas de sucos de laranja in natura, comercializados em um campus universitário de Cuiabá ? MT, em 2014. As amostras de suco de laranja in natura foram adquiridas de três estabelecimentos comerciais, situados no campus, sendo 5 amostras de cada estabelecimento, totalizando 15 amostras analisadas. As amostras de cada estabelecimento foram coletadas em dias distintos, tendo como exigência o suco ser sem açúcar. Para coliformes totais, a maioria das amostras, 11 (73,33%) apresentaram contagem ?2400 NMP/mL, 3 (20%) tiveram contagens de 240 NMP/mL e em 1 amostra (6,66%) contagem <3 NMP/mL. As amostras analisadas para coliformes termotolerantes não apresentaram diferença em seus resultados, e todas estavam abaixo do preconizado. Em nenhuma das amostras de suco foi verificada a presença de Salmonella spp, estando em conformidade com a RDC 12 de janeiro de 2001. A pesquisa mostrou que as amostras analisadas não representam riscos significantes à saúde do consumidor, mas há a necessidade de um sistema de vigilância sanitária mais eficiente.


Foodborne illness is considered one of the most serious public health problems, and fruit juices can be vehicles of microbial contamination. The main causes may be through the outer surface of the fruit, inadequate cleaning of equipment, and especially the water used in the formulations, which can be the carrier of various microorganisms. This study aimed to evaluate the microbiological characteristics of orange juice in natura, marketed on a college campus in Cuiabá, MT. In 2014, samples of orange juice were purchased from three commercial establishments situated at the campus, being 5 samples of each establishment, totaling 15 samples. Samples of each facility were collected on different days, with the requirement to be sugar-free juice. For total coliforms, the majority of samples, 11 (73.33%) had a counts ? 2400 NMP / mL, 3 samples (20%) counted 240 NMP / mL and 1 sample (6.66%) presented counts <3 MPN/mL. No significant differences were observed in fecal coliforms counts with all results below the accepted value, and the presence of Salmonella spp was not found in none of the juice samples, which complies with the Brazilian Legislation. This study has shown that the samples do not pose significant risks to consumer health, but there is a need for a more efficient health monitoring system.

4.
Virus Genes ; 48(1): 160-7, 2014 Feb.
Article in English | MEDLINE | ID: mdl-24166738

ABSTRACT

The sieving and immobilization of virus-host complexes using impact filtration (aka membrane co-immobilization or MCI) is a novel approach to the study of plankton viruses. One of the most interesting characteristics of the method is the possibility of generating data on potential viral hosts without the need of culturing hosts cells. MCI has demonstrated to be useful for studying viruses of picoalgae, but studies comparing data generated by MCI to data obtained by other techniques are lacking. In this work, Ostreococcus virus (OV) and Ostreococcus sp. sequences generated from virus-host complexes obtained by MCI were compared to sequences obtained from tangential filtration (TF) concentrates and virus cultures (VC). Statistical parsimony, phylogenetic analyses, pairwise distance comparisons, and analysis of molecular variance showed that the viral and host sequences obtained by the three methods were highly related to each other, indicating that MCI, TF, and VC produce equivalent results. Minor differences were observed among viral sequences obtained from VC and TF concentrates as well as among host sequences generated from VC and MCI. As discussed in the body of the paper, the divergence observed for cultured cells could be due to selective pressures exerted by culture conditions, whereas the correlate observed for the corresponding viral sequences could obey to a hitchhiking effect.


Subject(s)
Chlorophyta/virology , Filtration/methods , Phycodnaviridae/isolation & purification , Virology/methods , Chlorophyta/genetics , Molecular Sequence Data , Phycodnaviridae/genetics , Sequence Analysis, DNA
5.
Vet Microbiol ; 160(1-2): 1-8, 2012 Nov 09.
Article in English | MEDLINE | ID: mdl-22673320

ABSTRACT

Bovine herpesvirus 4 (BoHV-4) is a γ-herpesvirus that has been isolated both from apparently healthy animals and from cattle with a variety of clinical signs, including post-partum endometritis and abortion. BoHV-4 causes either a persistent or a latent infection in cells of the monocyte/macrophage lineage. Two groups of BoVH-4 strains have been defined based on their restriction patterns: the Movar-like strains (European prototype) and the DN 599-like strains (American prototype). The purpose of the present study was to genetically characterize wild type BoHV-4 strains isolated from vaginal discharges of aborted cows in Argentina. The virus was identified by isolation and nested PCR in all vaginal discharge samples from aborted cows, either as a sole agent or in association with other pathogens. Restriction enzyme profiling and phylogenetic analysis demonstrated that there is a high genetic variability among the studied field isolates. The existence of three groups of strains, which were designated as genotypes 1, 2 and 3, is described. Genotypes 1 and 2 possibly correspond to the Movar-like and DN 599-like groups, respectively, whereas Genotype 3 corresponds to a novel group. Two viral strains did not cluster into any of these three groups, indicating that other genotypes could be circulating in Argentina. These results suggest a complex epidemiological background for the Argentinean BoHV-4 strains, probably influenced by independent events of genetic drift. This hypothesis cannot be rejected based on the available data. However, there is no direct evidence supporting this possibility. Thus, it seems speculative to suggest that interspecific jumps are responsible for the observed phylogenetic grouping. On the other hand, our analyses suggest a geographical structure for the observed viral genotypes, since genotypes 1 and 2 included the European (Movar-like) and American (DN599-like) reference strains, respectively. Geographic dispersion is known to be a driver of herpes viruses diversification, and independent evolution in geographical isolated places ensures the emergence of particular mutations in each location due to genetic drift (Compans, 2007; Zong et al., 1999). Therefore, at this point, the genetic drift hypothesis is the one that requires less ad-hoc considerations and thus, to our understanding, is the one that fits to the findings from this study. The involvement of this genetic variability in the detection and pathogenesis of BoHV-4 remains to be investigated.


Subject(s)
Cattle Diseases/virology , Herpesviridae Infections/veterinary , Herpesvirus 4, Bovine/genetics , Abortion, Veterinary/virology , Animals , Argentina , Cattle , Cattle Diseases/genetics , Cell Line , Female , Herpesviridae Infections/genetics , Herpesviridae Infections/virology , Herpesvirus 4, Bovine/isolation & purification , Phylogeny , Polymerase Chain Reaction/methods , Polymerase Chain Reaction/veterinary , Pregnancy , Vagina/virology , Vaginal Smears/veterinary
6.
Pediatr Transplant ; 16(3): 274-9, 2012 May.
Article in English | MEDLINE | ID: mdl-22309031

ABSTRACT

The aim of the study was to evaluate whether or not serum levels of soluble interleukin 2 receptor (sIL-2R) predict acute rejection in pediatric recipients. We studied 51 pediatric renal transplant recipients divided into three groups: Group 1) Biopsy-proven cellular acute rejection (n = 19), Group 2) Graft dysfunction with histological diagnosis other than acute rejection (n = 8) and Group 3) Patients with stable graft function, no biopsy (n = 24). Serum samples for sIL-2R measurement by sandwich ELISA were obtained at the time of renal transplant and at the time of renal biopsy due to graft dysfunction (Groups 1 and 2) or at six months post-transplant in the case of Group 3. The mean ± s.e. serum values of sIL-2R were higher in patients during acute rejection (6539 ± 1802 pg/mL) compared to patients with other causes of graft dysfunction (2217 ± 256 pg/mL) or stable graft function at six months (2183 ± 283 pg/mL) (Kruskal-Wallis p = 0.004). When the sIL2-R levels at the time of transplant were compared to those at the time of biopsy (Groups 1 and 2) or at six months post-transplant in Group 3, there was no significant difference between baseline and biopsy in the acute rejection group (paired t-test = 0.07), whereas there was a significant reduction in Groups 2 and 3.


Subject(s)
Gene Expression Regulation , Graft Rejection , Kidney Transplantation/methods , Receptors, Interleukin-2/blood , Adolescent , Biopsy , Child , Enzyme-Linked Immunosorbent Assay/methods , Female , Glomerular Filtration Rate , Graft Survival , Humans , Kidney Transplantation/adverse effects , Male , Prospective Studies , ROC Curve , Reproducibility of Results
7.
J Med Virol ; 83(6): 935-40, 2011 Jun.
Article in English | MEDLINE | ID: mdl-21503903

ABSTRACT

The prevalence of hepatitis C virus genotype 4 (HCV-4) is increasing in different parts of the World but in Latin America the data are still scarce. We aimed to characterize HCV-4 isolates from 383 HIV-coinfected patients in Argentina. Sequence analyses were based on the non-structural 5B region of HCV. Results from 18 patients indicated a genetic heterogeneity that involved three genotype 4 subtypes. Sequences were ascribed to subtype 4d (67%), 4a (22%), and 4m (11%). In spite of different sources of transmission were defined among patients, no statistical association was found with the genotype 4 subtype. The scenario is also compatible with multiple importation of the epidemic and there is no evidence for transmission-specific clusters or network-like transmission of HCV-4. This HCV-4 does not represent a recent introduction in Argentina, it circulates in all transmission groups and its presence is increasing among HIV-infected patients.


Subject(s)
HIV Infections/complications , Hepacivirus/genetics , Hepatitis C/complications , Hepatitis C/virology , Adult , Aged , Argentina/epidemiology , Base Sequence , DNA, Viral/chemistry , Epidemics , Female , Genome, Viral , Genotype , HIV Infections/epidemiology , Hepacivirus/classification , Hepacivirus/pathogenicity , Hepatitis C/epidemiology , Humans , Male , Middle Aged , Molecular Sequence Data , Phylogeny , Prevalence , RNA, Viral/blood , RNA, Viral/genetics , RNA, Viral/isolation & purification , Reverse Transcriptase Polymerase Chain Reaction , Sequence Alignment , Sequence Analysis, DNA , Viral Load
8.
Plant Cell Rep ; 29(11): 1227-34, 2010 Nov.
Article in English | MEDLINE | ID: mdl-20690021

ABSTRACT

Auxin induces in vitro somatic embryogenesis in coconut plumular explants through callus formation. Embryogenic calli and non-embryogenic calli can be formed from the initial calli. Analysis of endogenous cytokinins showed the occurrence of cytokinins with aromatic and aliphatic side chains. Fourteen aliphatic cytokinins and four aromatic cytokinins were analysed in the three types of calli and all the cytokinins were found in each type, although some in larger proportions than others. The most abundant cytokinins in each type of callus were isopentenyladenine-9-glucoside, zeatin-9-glucoside, zeatin riboside, isopentenyladenine riboside, dihydrozeatin and dihydrozeatin riboside in decreasing order. Total cytokinin content was compared between the three types of calli, and it was found to be lower in embryogenic calli compared to non-embryogenic calli or initial calli. The same pattern was observed for individual cytokinins. When explants were cultured in media containing exogenously added cytokinins, the formation of embryogenic calli in the explants was reduced. When 8-azaadenine (an anticytokinin) was added the formation of embryogenic calli and somatic embryos was increased. These results suggest that the difference in somatic embryo formation capacity observed between embryogenic calli and non-embryogenic calli is related to their endogenous cytokinin contents.


Subject(s)
Cocos/chemistry , Cytokinins/analysis , Plant Somatic Embryogenesis Techniques/methods , Adenine/analogs & derivatives , Adenine/pharmacology , Cocos/growth & development , Culture Media , Cytokinins/biosynthesis
9.
Parasite Immunol ; 31(7): 412-21, 2009 Jul.
Article in English | MEDLINE | ID: mdl-19527457

ABSTRACT

Periparturient relaxation of immunity (PPRI) to secondary infection with nematodes is believed to have a nutritional basis due to differential partitioning of scarce nutrient resources, particularly protein, to reproductive rather than immune functions. At times of protein scarcity, an increase in protein supply has been reported to assuage this phenomenon. The Nippostrongylus brasiliensis reinfected lactating rat model is now being utilized to investigate the immune reactions underlying the modifying role of dietary protein on PPRI. Herein, we demonstrate that lactating rats reinfected with N. brasiliensis under high protein (HP) dietary conditions exhibit decreased worm burdens and reduced colon egg counts compared to their low protein (LP) counterparts. These reductions correlated with increased mastocytosis and greater goblet cell hyperplasia. Additionally, the local antibody profile revealed that HP reinfected lactating rats developed a stronger antigen specific IgG2b response earlier in infection in comparison with their LP counterparts. Our study provides evidence that increased dietary protein content reduces the PPRI to N. brasiliensis re-infection in the lactating rat through improved mucosal immune responses.


Subject(s)
Dietary Proteins/administration & dosage , Dietary Proteins/pharmacology , Immunologic Factors/administration & dosage , Immunologic Factors/pharmacology , Nippostrongylus/immunology , Strongylida Infections/immunology , Animals , Antibodies, Helminth/immunology , Colon/parasitology , Female , Goblet Cells/immunology , Mast Cells/immunology , Parasite Egg Count , Rats
10.
Virus Genes ; 38(1): 113-7, 2009 Feb.
Article in English | MEDLINE | ID: mdl-19023651

ABSTRACT

Equid Herpesvirus 1 (EHV-1) has long been causally implicated in the occurrence of abortion, neonatal death, respiratory disease, and neurological disorders in horses. This study analyzed for the first time the characteristics of the genomic section of Argentinian EHV-1 strains and reconstructed the phylogeny in order to establish their origin. The phylogenetic dataset included 22 Argentinian strains and four additional reference strains isolated in other countries. The intergenic region between ORF 62 and ORF 63 was amplified by PCR and sequenced. The phylogenetic analysis carried out by parsimony algorithms showed that six of the Argentinian strains had the same origin as British and Japanese strains. The mapping of symptoms caused by EHV-1 suggested that neonatal disease developed through convergent evolution, which would constitute an adaptation mechanism of the virus. This study constitutes the first analysis carried out in South-American strains that establishes the phylogenetic relationship between Argentinian strains and rebuilds the evolutionary history of symptoms. This study focuses on a very important aspect of evolution of Herpesviridae infecting perissodactyls and attempts to shed light on the evolution of symptoms, an issue of high clinical interest.


Subject(s)
Herpesvirus 1, Equid/classification , Herpesvirus 1, Equid/genetics , Phylogeny , Animals , Argentina , Cluster Analysis , DNA, Viral/chemistry , DNA, Viral/genetics , Herpesvirus 1, Equid/isolation & purification , Horses , Molecular Epidemiology , Molecular Sequence Data , Polymerase Chain Reaction/methods , Sequence Analysis, DNA , Sequence Homology, Nucleic Acid
11.
Infect Genet Evol ; 8(6): 835-46, 2008 Dec.
Article in English | MEDLINE | ID: mdl-18773972

ABSTRACT

To gain an understanding of the genetic structure and dispersal dynamics of Triatoma infestans populations, we analyzed the multilocus genotype of 10 microsatellite loci for 352 T. infestans collected in 21 houses of 11 rural communities in October 2002. Genetic structure was analyzed at the community and house compound levels. Analysis revealed that vector control actions affected the genetic structure of T. infestans populations. Bug populations from communities under sustained vector control (core area) were highly structured and genetic differentiation between neighboring house compounds was significant. In contrast, bug populations from communities with sporadic vector control actions were more homogeneous and lacked defined genetic clusters. Genetic differentiation between population pairs did not fit a model of isolation by distance at the microgeographical level. Evidence consistent with flight or walking bug dispersal was detected within and among communities, dispersal was more female-biased in the core area and results suggested that houses received immigrants from more than one source. Putative sources and mechanisms of re-infestation are described. These data may be use to design improved vector control strategies.


Subject(s)
Insect Vectors/genetics , Microsatellite Repeats , Rural Population , Triatoma/genetics , Analysis of Variance , Animals , Argentina/epidemiology , Bayes Theorem , Chagas Disease/epidemiology , Chagas Disease/genetics , Chagas Disease/transmission , Female , Genetic Variation , Humans , Insect Control , Insect Vectors/physiology , Insecticides , Linkage Disequilibrium , Male , Monte Carlo Method , Polymerase Chain Reaction , Population Dynamics , Sex Distribution , Triatoma/physiology
12.
Vet Microbiol ; 118(1-2): 1-11, 2006 Nov 26.
Article in English | MEDLINE | ID: mdl-16982159

ABSTRACT

Group A bovine rotavirus (BRV) is one of the main causes of neonatal calf diarrhea. The present study reports the incidence of rotavirus diarrhea and the genotypes of BRV strains circulating in beef and dairy herds from Argentina, during a 10-year period (1994-2003). Group A BRV was detected in 62.5% (250/400) of the total studied cases of diarrhea. Positive cases were analyzed by heminested multiplex RT-PCR for P and G genotypes identification. Sixty percent of them were typed as P[5]G6, 4.4% P[11]G10, 4.4% P[11]G6 and 2.4% P[5]G10. Additionally, 9.2% of the cases were initially typed as G8 combined with P[5] or P[11], but sequence analysis revealed they belonged to genotype G6, lineage Hun4-like. Partial typing was assessed in 12.0% of the cases. One of the partially typed samples was closely related to genotype G15. BRV was detected in 71% and 58% of the outbreaks registered in beef and dairy farms, respectively. A clear differential distribution of G/P types was found according to the herd type. P[5]G6 was the prevalent strain in beef herds, while P[11] was the prevalent P-type in dairy herds (71%), associated in similar proportions with G6 and G10, These findings indicate that BRV genotypes included in the current commercially available rotavirus vaccines (G6, G10, P[5] and P[11]) should protect calves from most Argentinean field strains. Nevertheless, continuous surveillance is necessary to detect the emergence of new variants.


Subject(s)
Cattle Diseases/virology , Diarrhea/veterinary , RNA, Viral/chemistry , Rotavirus Infections/veterinary , Rotavirus/genetics , Animals , Animals, Newborn/virology , Argentina/epidemiology , Base Sequence , Cattle , Cattle Diseases/epidemiology , Diarrhea/epidemiology , Diarrhea/virology , Disease Outbreaks/veterinary , Feces/virology , Female , Genotype , Incidence , Male , Molecular Sequence Data , Reverse Transcriptase Polymerase Chain Reaction , Rotavirus/isolation & purification , Rotavirus Infections/epidemiology , Rotavirus Infections/virology
13.
Cladistics ; 20(5): 443-453, 2004 Oct.
Article in English | MEDLINE | ID: mdl-34892956

ABSTRACT

This study presents a phylogenetic analysis of 115 bovine pestiviruses. A sequence data set from the 5' untranslated genomic region was analyzed with maximum parsimony, bootstrapping and parsimony jackknifing. We tested for the proposed classifications of the group and analyzed the evolution of the symptoms associated with Pestivirus infections in bovines. Based on the historical framework provided by our phylogenetic trees, we also characterized the extent and importance of contamination caused in biologicals by the virus. Our phylogenetic analyses showed that the previously defined genotypes are monophyletic, except for genotype 1a. Based on our cladograms, we propose the existence of more than 12 monophyletic groups within the species BVDV 1. The mapping of clinical symptoms suggests that the emergence of some genotypes could have been driven by a change in the pathogenic process. Enteric Problems appear to be ancestral, while Reproductive and Respiratory Problems arise with the emergence of genotypes 1b, 1d and the herein-proposed genotype Arg 1. The distribution of contaminant strains on the cladograms shows that pestiviral contamination is a common process, and also suggests that a contaminated product might be a vehicle for virus dispersion. Implications for virus evolution, virus taxonomy, veterinary medicine and biotechnology are discussed.

14.
J Interferon Cytokine Res ; 23(1): 47-50, 2003 Jan.
Article in English | MEDLINE | ID: mdl-12639298

ABSTRACT

Early and sustained treatment with interleukin-12 (IL-12) ameliorated disease in a mouse model of infection with the encephalitogenic flavivirus, St. Louis encephalitis virus (SLEV, Japanese encephalitis serogroup). However, this effect was not reproduced in murine infections with either the flavivirus tick-bore encephalitis virus (TBEV) or the alphavirus Venezuelan equine encephalitis virus (VEEV). IL-12 exacerbated TBEV disease when used in conjunction with monoclonal antibody (mAb), suggesting an enhancement of immunopathology, and was without clinical effects in VEEV infection. These data confirm the need to fully understand the pathogenesis of viral infection before cytokine intervention may be employed as a broad-spectrum antiviral therapy.


Subject(s)
Antibodies, Monoclonal/therapeutic use , Encephalitis, St. Louis/drug therapy , Encephalitis, Tick-Borne/drug therapy , Encephalomyelitis, Venezuelan Equine/drug therapy , Interleukin-12/therapeutic use , Animals , Antibodies, Monoclonal/administration & dosage , Antibodies, Monoclonal/toxicity , Antiviral Agents/administration & dosage , Antiviral Agents/therapeutic use , Antiviral Agents/toxicity , Disease Models, Animal , Interleukin-12/administration & dosage , Interleukin-12/toxicity , Mice , Recombinant Proteins/administration & dosage , Recombinant Proteins/therapeutic use , Recombinant Proteins/toxicity
15.
Virus Res ; 91(2): 255-9, 2003 Feb.
Article in English | MEDLINE | ID: mdl-12573505

ABSTRACT

Previously published research has established that the immune response to the Venezuelan equine encephalitis virus (VEEV) vaccine strain TC-83 is Th 1-mediated, with local activation of both CD4+ and CD8+ T cells. This suggests that cytotoxic lymphocytes CTL may play a role in protection against virulent VEEV. Studies involving a variety of immunisation schedules with either TC-83 or strain CAAR 508 (serogroup 5) of VEEV, and six different haplotypes of mice, failed to reveal functional CTL activity against VEEV-infected targets in secondary antigen-stimulated lymphocyte cultures from either the draining lymph nodes (LN) or spleen. Nor were VEEV-specific CTL detected after immunisation of mice (three haplotypes) with recombinant vaccinia viruses (VV) expressing either the non-structural (nsP1-4) or the structural (C-E3-E2-6K-E1) genes of TC-83. Reciprocal experiments in which mice were immunised with TC-83, and their lymphocytes tested against VV recombinant-infected targets also failed to detect CTL activity. These data suggest that VEEV infection of mice does not elicit detectable CTL activity, and that CTL are unlikely to play a role in protection against virulent VEEV.


Subject(s)
Encephalitis Virus, Venezuelan Equine/immunology , Encephalomyelitis, Venezuelan Equine/immunology , T-Lymphocytes, Cytotoxic/immunology , Animals , Cells, Cultured , Encephalitis Virus, Venezuelan Equine/pathogenicity , Encephalomyelitis, Venezuelan Equine/prevention & control , Haplotypes , Immunization , Lymph Nodes/cytology , Lymph Nodes/immunology , Mice , Mice, Inbred BALB C , Mice, Inbred C57BL , Mice, Inbred CBA , Spleen/cytology , Spleen/immunology , Vaccinia virus/genetics , Viral Proteins/genetics , Viral Vaccines/administration & dosage , Viral Vaccines/immunology
16.
Vaccine ; 20(11-12): 1497-504, 2002 Feb 22.
Article in English | MEDLINE | ID: mdl-11858855

ABSTRACT

Airborne infection with Venezuelan equine encephalitis virus (VEEV) is a significant hazard for laboratory workers, who may not be immunised against VEEV infection as there is no vaccine currently available suitable for human use. We describe a potential alternative strategy that could protect workers exposed to VEEV or similar viruses. VEEV-specific murine monoclonal antibodies (MAB), given by intraperitoneal (i.p.) injection to mice as a single dose of 100 microg, have a half-life of 6-10 days in serum and spread by transudation to respiratory secretions. Administration of MAB (approximately 4 mg/kg) to mice 24h before challenge with approximately 100LD50 of virulent VEEV protected up to 100% animals. The same dose of MAB delivered up to 24h after challenge protected approximately 50%. Two MAB that were synergistic in vitro in plaque reduction neutralisation tests were not synergistic in vivo in protection assays. An examination of virus multiplication, in the blood and internal organs (brain, spleen, lung) of MAB-treated mice infected by the airborne route with VEEV, suggested that therapeutic activity depended both upon the prevention of virus infection of the brain, and the rapid clearance of virus from the periphery. Antiviral therapy with VEEV-specific human or "humanised" MAB, providing that they are administered early, may offer an alternative means of specific medical intervention for those with a known exposure to VEEV.


Subject(s)
Antibodies, Monoclonal/pharmacology , Antibodies, Viral/pharmacology , Encephalitis Virus, Venezuelan Equine/immunology , Encephalomyelitis, Venezuelan Equine/prevention & control , Animals , Antibodies, Monoclonal/pharmacokinetics , Antibodies, Viral/metabolism , Encephalitis Virus, Venezuelan Equine/pathogenicity , Encephalomyelitis, Venezuelan Equine/immunology , Encephalomyelitis, Venezuelan Equine/virology , Humans , Medical Laboratory Personnel , Mice , Mice, Inbred BALB C , Neutralization Tests , Occupational Diseases/immunology , Occupational Diseases/prevention & control , Zoonoses
17.
Vet Microbiol ; 81(4): 367-75, 2001 Aug 20.
Article in English | MEDLINE | ID: mdl-11390117

ABSTRACT

Genetic typing of 29 Bovine Viral Diarrhea Virus (BVDV) isolates from Argentina was carried out by sequencing 245 nucleotides of the RT-PCR products of the 5'-UTR region. Sequence analysis shows that these Argentinean BVDV include types 1 and 2. The majority (26/29) of the isolates are type 1, which comprises subtypes 1a and 1b, together with an additional subgroup within subtype 1a. This subgroup is close to the South African subgroup Ic of 1a viruses, and to the deer pestivirus strain "Deer". The three type 2 BVDV were isolated from fetal tissues or serum during the 7-8 years before a clinical outbreak in Argentina had been reported. Only inactivated vaccines are used in bovines of the country, thus the analysed viruses are authentic field strains. The long term circulation of type 2 BVDV (situation similar to that of North America before the epidemic of 1993), and the existence of viral populations which differ from the reference strains commonly used in vaccine elaboration should be considered by manufacturers of diagnostic reagents and vaccines.


Subject(s)
Diarrhea Viruses, Bovine Viral/genetics , Animals , Argentina , Bovine Virus Diarrhea-Mucosal Disease/virology , Cattle , Diarrhea Viruses, Bovine Viral/classification , Genotype , Phylogeny
18.
J Vet Diagn Invest ; 13(1): 50-6, 2001 Jan.
Article in English | MEDLINE | ID: mdl-11243363

ABSTRACT

Single-strand conformation polymorphism (SSCP) analysis of polymerase chain reaction (PCR) products is a genetic screening technique for rapid detection of nucleotide substitutions in PCR-amplified genomic DNA or cDNA. It is based on the observation that partially formamide-denatured double-stranded DNA migrates as 2 single-stranded DNA molecules when electrophoresed in nondenaturing polyacrylamide gels. The mobility depends on the 3-dimensional conformation of the strand under the conditions used. It is possible to discriminate between DNA strands differing in only 1 nucleotide. The method was applied to the analysis of Bovine Viral Diarrhea Virus (BVDV) isolates. Reference and Argentinian strains were assessed for variations in their 5' untranslated region (5'-UTR). The PCR products of the 5'-UTR ends were formamide denatured and compared by SSCP analysis in nondenaturing 15% polyacrylamide and 15% polyacrilamide-5% glycerol gels. The reference strains SD-1, Singer, and Oregon C24V had differences in electrophoretic patterns. Despite the high conservation among the 5'-UTR of pestiviruses, the method allowed discrimination among all 9 Argentinian isolates. The 5'-UTR of a fetal kidney-derived isolate (1R93) was PCR amplified and cloned in a plasmid vector; the SSCP analysis of 30 PCR products obtained by direct amplification over randomly selected clones produced 5 different banding patterns, indicating the existence of viral quasispecies. The results show that SSCP may be used to identify and differentiate among BVDV isolates.


Subject(s)
Bovine Virus Diarrhea-Mucosal Disease/diagnosis , Diarrhea Viruses, Bovine Viral/genetics , Polymorphism, Single-Stranded Conformational , 5' Untranslated Regions/genetics , Animals , Base Sequence , Bovine Virus Diarrhea-Mucosal Disease/genetics , Cattle , Kidney/pathology , Kidney/virology , Molecular Sequence Data , Plasmids , Polymerase Chain Reaction/veterinary , Sensitivity and Specificity
19.
Invest Clin ; 40(1): 51-66, 1999 Mar.
Article in Spanish | MEDLINE | ID: mdl-10198561

ABSTRACT

Insulin resistance and hyperinsulinemia can induce overproduction of triglyceride (TG) rich VLDL in the liver by increasing the availability of free fatty acids (FFA). Conversely, apolipoprotein C-III (apoC-III) is an inhibitor of the catabolism of TG-rich lipoproteins. To explore the relationship among FFA, apo C-III and TG in hyperinsulinemic subjects, we studied 103 individuals (63 women and 40 men) with a body mass index (BMI) 25 Kg/m2: 59 subjects with normal glucose tolerance (NGT), and 44 with newly diagnosed type 2 diabetes. After adjustment for age, BMI, fasting insulin and TG, FFA were significantly higher in women than in men and in subjects with diabetes compared with NGT. Subjects with diabetes had higher apo C-III levels compared to NGT, adjusted for age, sex and BMI, and that was largely accounted for by differences in insulin and TG levels. In addition, regression analysis in subjects with diabetes showed that TG were strongly associated with apo C-III in both men and women (r = 0.90 and 0.79, respectively; p < 0.001), while the association tended to be smaller between TG and FFA (r = 0.48, p < 0.05 in men and r = 0.45, p = 0.06 in women). Conversely, in individuals with NGT fasting TG was strongly associated with apo C-III in men (r = 0.83, p < 0.01) but not with FFA, while in women TG was associated with FFA (r = 0.39, p < 0.05) but not with apo C-III. In summary, elevated apo C-III was a predominant factor associated with elevated TG levels in NGT men and all subjects with type 2 diabetes, while FFA were more closely related with TG levels in NGT women.


Subject(s)
Apolipoproteins C/blood , Blood Glucose/analysis , Diabetes Mellitus, Type 2/blood , Fatty Acids, Nonesterified/blood , Triglycerides/blood , Adult , Age Factors , Apolipoprotein C-III , Female , Glucose Tolerance Test , Humans , Male , Middle Aged , Regression Analysis , Risk Factors , Sex Factors
20.
Inflamm Res ; 44(9): 372-5, 1995 Sep.
Article in English | MEDLINE | ID: mdl-8846194

ABSTRACT

The indole-3-acetic acid (IAA) is a plant growth hormone (auxin) being considered as a tryptophan metabolite in animals. The main purpose of this work was to verify IAA's topical anti-inflammatory action using croton oil- or arachidonic acid-induced mouse ear edema, in comparison to known anti-inflammatory agents. IAA antioxidant activity was also verified by measuring the inhibition of brain homogenate lipid peroxidation with the thiobarbituric acid reactive substances (TBARS) test. IAA inhibited the action of both croton oil-and arachidonic acid-induced edema in a dose-dependent manner (4.0 mumoles IAA inhibited 75.8% in croton oil and 82.5% in arachidonic acid induced ear edema). Both IAA (5.3 mM) and indomethacin (8.0 mM) inhibited TBARS formation. Data suggest that IAA exhibits antiinflammatory effect possibly by its anti-oxidant activity.


Subject(s)
Anti-Inflammatory Agents/pharmacology , Antioxidants/pharmacology , Indoleacetic Acids/pharmacology , Administration, Topical , Animals , Arachidonic Acid/pharmacology , Croton Oil/pharmacology , Edema/prevention & control , Indomethacin/pharmacology , Lipid Peroxidation/drug effects , Male , Mice , Rats , Rats, Wistar
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