RESUMEN
WHAT IS KNOWN AND OBJECTIVE: Attention-deficit hyperactivity disorder (ADHD) symptoms usually impairs academic achievement and can trigger the onset of medication. Methylphenidate is a drug widely prescribed to treat ADHD. However, systematic reviews of randomized clinical trials suggest that it does not lead to great improvements in academic performance. Thus, we aimed to evaluate the evidence on the "real-world" effectiveness of methylphenidate in improving the academic achievement of ADHD students. METHODS: We conducted a systematic review of observational studies retrieved from five electronic databases, besides a manual search and search in grey literature. Studies evaluating treatment with methylphenidate compared to no treatment or other pharmacological/non-pharmacological alternatives used in ADHD were included. The risk of bias of the selected studies was assessed using adapted versions of the Newcastle-Ottawa Scale. RESULTS AND DISCUSSION: Nine studies (from ten reports) were included in the review: four cohorts, two before-and-after designs and three cross-sectional studies. They involved 12,269 children and adolescents aged 6-18 years. The doses of methylphenidate ranged from 10 to 72 mg/day, and the duration of the treatment from 2.6 months to 4.25 years. Five of these studies concluded that methylphenidate improves academic performance. However, three of the four lowest-bias risk studies concluded that the drug is ineffective. Five studies assessed the long-term use of methylphenidate, and four of them concluded that it does not result in better outcomes in the school setting. Most included studies had considerable limitations and significant heterogeneity regarding methodological design and academic performance measurement criteria. WHAT IS NEW AND CONCLUSION: Although some studies indicate that the short-term use of methylphenidate may improve outcomes in the school environment, the available evidence does not support the establishment of adequate conclusions about the real benefits of methylphenidate in the academic improvement of ADHD students.
Asunto(s)
Trastorno por Déficit de Atención con Hiperactividad/tratamiento farmacológico , Estimulantes del Sistema Nervioso Central/uso terapéutico , Metilfenidato/uso terapéutico , Estudiantes , Éxito Académico , Adolescente , Estimulantes del Sistema Nervioso Central/efectos adversos , Niño , Estudios Transversales , Humanos , Metilfenidato/efectos adversos , Estudios Observacionales como AsuntoRESUMEN
BACKGROUND: Zika virus (ZIKV) infection during pregnancy may cause major congenital defects, including microcephaly, ocular, articular and muscle abnormalities, which are collectively defined as Congenital Zika Syndrome. Here, we performed an in-depth characterization of the effects of congenital ZIKV infection (CZI) in immunocompetent mice. METHODS: Pregnant dams were inoculated with ZIKV on embryonic day 5.5 in the presence or absence of a sub-neutralizing dose of a pan-flavivirus monoclonal antibody (4G2) to evaluate the potential role of antibody-dependent enhancement phenomenon (ADE) during short and long outcomes of CZI. FINDINGS: ZIKV infection induced maternal immune activation (MIA), which was associated with occurrence of foetal abnormalities and death. Therapeutic administration of AH-D antiviral peptide during the early stages of pregnancy prevented ZIKV replication and death of offspring. In the post-natal period, CZI was associated with a decrease in whole brain volume, ophthalmologic abnormalities, changes in testicular morphology, and disruption in bone microarchitecture. Some alterations were enhanced in the presence of 4G2 antibody. INTERPRETATION: Our results reveal that early maternal ZIKV infection causes several birth defects in immunocompetent mice, which can be potentiated by ADE phenomenon and are associated with MIA. Additionally, antiviral treatment with AH-D peptide may be beneficial during early maternal ZIKV infection. FUND: This work was supported by the Brazilian National Science Council (CNPq, Brazil), Minas Gerais Foundation for Science (FAPEMIG), Funding Authority for Studies and Projects (FINEP), Coordination of Superior Level Staff Improvement (CAPES), National Research Foundation of Singapore and Centre for Precision Biology at Nanyang Technological University.
Asunto(s)
Acrecentamiento Dependiente de Anticuerpo/inmunología , Interacciones Huésped-Patógeno/inmunología , Complicaciones Infecciosas del Embarazo , Infección por el Virus Zika/inmunología , Infección por el Virus Zika/virología , Virus Zika/fisiología , Animales , Anticuerpos Antivirales/inmunología , Antivirales/farmacología , Huesos/diagnóstico por imagen , Huesos/patología , Encéfalo/efectos de los fármacos , Encéfalo/inmunología , Encéfalo/patología , Encéfalo/virología , Citocinas/metabolismo , Modelos Animales de Enfermedad , Femenino , Humanos , Ratones , Péptidos/farmacología , Embarazo , Bazo/efectos de los fármacos , Bazo/inmunología , Bazo/patología , Bazo/virología , Síndrome , Resultado del Tratamiento , Carga Viral , Infección por el Virus Zika/diagnóstico , Infección por el Virus Zika/tratamiento farmacológicoRESUMEN
BACKGROUND AND PURPOSE: The endocannabinoids anandamide and 2-arachidonoylglycerol (2-AG) bind to CB1 and CB2 cannabinoid receptors in the brain and modulate the mesolimbic dopaminergic pathway. This neurocircuitry is engaged by psychostimulant drugs, including cocaine. Although CB1 receptor antagonism and CB2 receptor activation are known to inhibit certain effects of cocaine, they have been investigated separately. Here, we tested the hypothesis that there is a reciprocal interaction between CB1 receptor blockade and CB2 receptor activation in modulating behavioural responses to cocaine. EXPERIMENTAL APPROACH: Male Swiss mice received i.p. injections of cannabinoid-related drugs followed by cocaine, and were then tested for cocaine-induced hyperlocomotion, c-Fos expression in the nucleus accumbens and conditioned place preference. Levels of endocannabinoids after cocaine injections were also analysed. KEY RESULTS: The CB1 receptor antagonist, rimonabant, and the CB2 receptor agonist, JWH133, prevented cocaine-induced hyperlocomotion. The same results were obtained by combining sub-effective doses of both compounds. The CB2 receptor antagonist, AM630, reversed the inhibitory effects of rimonabant in cocaine-induced hyperlocomotion and c-Fos expression in the nucleus accumbens. Selective inhibitors of anandamide and 2-AG hydrolysis (URB597 and JZL184, respectively) failed to modify this response. However, JZL184 prevented cocaine-induced hyperlocomotion when given after a sub-effective dose of rimonabant. Cocaine did not change brain endocannabinoid levels. Finally, CB2 receptor blockade reversed the inhibitory effect of rimonabant in the acquisition of cocaine-induced conditioned place preference. CONCLUSION AND IMPLICATIONS: The present data support the hypothesis that CB1 and CB2 receptors work in concert with opposing functions to modulate certain addiction-related effects of cocaine. LINKED ARTICLES: This article is part of a themed section on 8th European Workshop on Cannabinoid Research. To view the other articles in this section visit http://onlinelibrary.wiley.com/doi/10.1111/bph.v176.10/issuetoc.
Asunto(s)
Ácidos Araquidónicos/metabolismo , Cocaína/farmacología , Endocannabinoides/metabolismo , Glicéridos/metabolismo , Alcamidas Poliinsaturadas/metabolismo , Receptor Cannabinoide CB1/antagonistas & inhibidores , Receptor Cannabinoide CB2/agonistas , Recompensa , Animales , Conducta Animal/efectos de los fármacos , Agonistas de Receptores de Cannabinoides/farmacología , Antagonistas de Receptores de Cannabinoides/farmacología , Condicionamiento Clásico , Masculino , Ratones , Actividad Motora/efectos de los fármacos , Unión Proteica , Proteínas Proto-Oncogénicas c-fos/metabolismoRESUMEN
The monoamine stabilizer (3S)-3-[3-(methenesulfonyl)phenyl]-1-propylpiperidine hidrochloride [(-)-OSU6162] is a promising compound for the treatment of neurological and psychiatric disorders, such as schizophrenia. Here, we tested the hypothesis that (-)-OSU6162 prevents hyperlocomotion and sensorimotor deficits in prepulse inhibition of the startle response (PPI) induced by psychomimetic drugs. Male Swiss mice received injections of (-)-OSU6162 (1, 3, 10, or 30 mg/kg), and their motor responses were investigated in the open field and in the catalepsy tests, which predicts liability to induce sedation and extrapyramidal side effects, respectively. Next, in independent experiments, this compound was evaluated for its efficacy to prevent hyperlocomotion induced by cocaine (10 mg/kg; dopamine transporter inhibitor) or ketamine (60 mg/kg; glutamate NMDA channel blocker) in the open field. Finally, we tested if (-)-OSU6162 prevents PPI disruption induced by MK-801 (0.5 mg/kg; glutamate NMDA channel blocker). (-)-OSU6162 induced neither locomotion impairment nor catalepsy. This compound prevented cocaine-induced hyperlocomotion at the doses of 10 and 30 mg/kg and ketamine-induced hyperlocomotion at the doses of 1 and 3 mg/kg. In the sensorimotor test, (-)-OSU6162 failed to reverse MK-801-induced PPI deficits. The dopamine stabilizer (-)-OSU6162 prevents the hyperactivity induced by dopaminergic and anti-glutamatergic drugs at doses that preserve motor functions, although it failed in the PPI test. Its therapeutic potential for specific symptoms of schizophrenia warrants further investigation in both preclinical and clinical studies.
Asunto(s)
Antipsicóticos/farmacología , Piperidinas/farmacología , Animales , Conducta Animal/efectos de los fármacos , Cocaína/farmacología , Inhibidores de Captación de Dopamina/farmacología , Antagonistas de Aminoácidos Excitadores/farmacología , Ketamina/farmacología , Locomoción/efectos de los fármacos , Masculino , Ratones , Receptores de N-Metil-D-Aspartato/antagonistas & inhibidores , Reflejo de Sobresalto/efectos de los fármacos , Esquizofrenia/tratamiento farmacológicoRESUMEN
Maternal immune activation (MIA) during pregnancy in rodents increases the risk of the offspring to develop schizophrenia-related behaviors, suggesting a relationship between the immune system and the brain development. Here we tested the hypothesis that MIA induced by the viral mimetic polyinosinic-polycytidylic acid (poly I:C) in early or late gestation of mice leads to behavioral and neuroanatomical disorders in the adulthood. On gestational days (GDs) 9 or 17 pregnant dams were treated with poly I:C or saline via intravenous route and the offspring behaviors were measured during adulthood. Considering the progressive structural neuroanatomical alterations in the brain of individuals with schizophrenia, we used magnetic resonance imaging (MRI) to perform brain morphometric analysis of the offspring aged one year. MIA on GD9 or GD17 led to increased basal locomotor activity, enhanced motor responses to ketamine, a psychotomimetic drug, and reduced time spent in the center of the arena, suggesting an increased anxiety-like behavior. In addition, MIA on GD17 reduced glucose preference in the offspring. None of the treatments altered the relative volume of the lateral ventricles. However, a decrease in brain volume, especially for posterior structures, was observed for one-year-old animals treated with poly I:C compared with control groups. Thus, activation of the maternal immune system at different GDs lead to neuroanatomical and behavioral alterations possibly related to the positive and negative symptoms of schizophrenia. These results provide insights on neuroimmunonological and neurodevelopmental aspects of certain psychopathologies, such as schizophrenia.
Asunto(s)
Encéfalo/patología , Trastornos Mentales/etiología , Efectos Tardíos de la Exposición Prenatal/fisiopatología , Esquizofrenia/complicaciones , Esquizofrenia/etiología , Esquizofrenia/patología , Factores de Edad , Análisis de Varianza , Animales , Animales Recién Nacidos , Encéfalo/diagnóstico por imagen , Encéfalo/embriología , Encéfalo/crecimiento & desarrollo , Modelos Animales de Enfermedad , Embrión de Mamíferos , Femenino , Preferencias Alimentarias , Inductores de Interferón/toxicidad , Ketamina/toxicidad , Locomoción/fisiología , Imagen por Resonancia Magnética , Ratones , Ratones Endogámicos C57BL , Poli I-C/toxicidad , Embarazo , Esquizofrenia/diagnóstico por imagen , Sacarosa/administración & dosificaciónRESUMEN
Objetivo: avaliar o perfil sociodemográfico e nutricional na diferença entre homens e mulheres idosos no programa Universidade Aberta para a Maturidade. Método: estudo descritivo, de abordagem quantitativa, com 67 idosos selecionados por amostragem não probabilística intencional, ingressantes em 2013-2014, por meio de um formulário estruturado. Resultados: verificou-se predominância de mulheres entre 60 a 65 anos; homens casados e mulheres viúvas; escolaridade - ensino fundamental em ambos. Dentre as variáveis antropométricas, os valores de IMC e CC apresentam-se acima das normalidades nos homens; nas variáveis bioquímicas, o aumento da glicemia está mais presente nos homens, já o colesterol e o triglicérides encontra-se com valores alterados nas mulheres. Conclusão: conhecer as características sociodemográficas, concomitante às informações antropométricas e bioquímicas, permite trabalhar o envelhecimento no sentido de prevenir as doenças crônicas não transmissíveis e acrescentar qualidade de vida ao idoso.
Asunto(s)
Masculino , Femenino , Humanos , Anciano , Evaluación Geriátrica , Condiciones Sociales , Dinámica Poblacional , Anciano , Encuestas Nutricionales , Antropometría , Biomarcadores , Epidemiología Descriptiva , Calidad de VidaRESUMEN
Aripiprazole is an antipsychotic that acts as a partial agonist at dopamine D2 receptors. In addition to its antipsychotic activity, this compound blocks the effects of some psychostimulant drugs. It has not been verified, however, if aripiprazole interferes with the effects of caffeine. Hence, this study tested the hypothesis that aripiprazole prevents caffeine-induced hyperlocomotion and investigated the effects of these drugs on neural activity in the striatum. Male Swiss mice received injections of vehicle or antipsychotic drugs followed by vehicle or caffeine. Locomotion was analyzed in a circular arena and c-Fos protein expression was quantified in the dorsolateral, dorsomedial, and ventrolateral striatum, and in the core and shell regions of nucleus accumbens. Aripiprazole (0.1, 1, and 10 mg/kg) prevented caffeine (10 mg/kg)-induced hyperlocomotion at doses that do not change basal locomotion. Haloperidol (0.01, 0.03, and 0.1 mg/kg) also decreased caffeine-induced hyperlocomotion at all doses, although at the two higher doses, this compound reduced basal locomotion. Immunohistochemistry analysis showed that aripiprazole increases c-Fos protein expression in all regions studied, whereas caffeine did not alter c-Fos protein expression. Combined treatment of aripiprazole and caffeine resulted in a decrease in the number of c-Fos positive cells as compared to the group receiving aripiprazole alone. In conclusion, aripiprazole prevents caffeine-induced hyperlocomotion and increases neural activation in the striatum. This latter effect is reduced by subsequent administration of caffeine. These results advance our understanding on the pharmacological profile of aripiprazole.
Asunto(s)
Antipsicóticos/farmacología , Aripiprazol/farmacología , Cafeína/farmacología , Estimulantes del Sistema Nervioso Central/farmacología , Cuerpo Estriado/efectos de los fármacos , Animales , Conducta Animal/efectos de los fármacos , Cuerpo Estriado/metabolismo , Cuerpo Estriado/fisiología , Masculino , Ratones , Actividad Motora/efectos de los fármacos , Proteínas Proto-Oncogénicas c-fos/metabolismoRESUMEN
Este estudo busca investigar as práticas corporais dos idosos no ambiente da praia como experiência contemporânea do envelhecimento, por meio de pesquisa de campo de tipo etnográfica. Os resultados indicam que a imagem do idoso na praia atinge um estado multifacetado, porque não se apresenta radicalmente diferente das práticas corporais adotadas pelos jovens, nem ela é totalmente equivalente àquela configurada como do velho, provocando, assim, novos focos sobre o idoso na praia na era contemporânea.(AU)
This study aims to investigate the bodily practices of the elderly in the beach environment as contemporary experience of aging through ethnographic research. The results indicate that the image of the elderly at the beach reaches a multifaceted state because it has not radically different bodily practices adopted by young people, or configured as fully equivalent to those of old, thus bringing new focus on the elderly in the contemporary era.(AU)
Asunto(s)
Humanos , Anciano , Envejecimiento , Anciano , Actividad Motora , PlayasRESUMEN
Este estudo busca investigar as práticas corporais dos idosos no ambiente da praia como experiência contemporânea do envelhecimento, por meio de pesquisa de campo de tipo etnográfica. Os resultados indicam que a imagem do idoso na praia atinge um estado multifacetado, porque não se apresenta radicalmente diferente das práticas corporais adotadas pelos jovens, nem ela é totalmente equivalente àquela configurada como do velho, provocando, assim, novos focos sobre o idoso na praia na era contemporânea.
This study aims to investigate the bodily practices of the elderly in the beach environment as contemporary experience of aging through ethnographic research. The results indicate that the image of the elderly at the beach reaches a multifaceted state because it has not radically different bodily practices adopted by young people, or configured as fully equivalent to those of old, thus bringing new focus on the elderly in the contemporary era.
Asunto(s)
Humanos , Anciano , Anciano , Envejecimiento , Playas , Actividad MotoraRESUMEN
A set of four di-imine copper(II) complexes containing pyridine, pyrazine and/or imidazole moieties, [Cu(apyhist)H2O](2+) 1 (apyhist = 2-(1H-imidazol-4-yl)-N-(1-(pyridin-2-yl)ethylidene)ethanamine), [Cu(apzhist)OH](+) 2 (apzhist = 2-(1H-imidazol-4-yl)-N-(1-(pyrazin-2-yl)ethylidene)ethanamine), [Cu(apyepy)OH](+) 3 (apyepy = 2-(pyridin-2-yl)-N-(1-(pyridin-2-yl)ethylidene)ethanamine), and [Cu(apzepy)H2O](2+) 4 (apzepy = N-(1-(pyrazin-2-yl)ethylidene)-2-(pyridin-2-yl)ethanamine), were investigated regarding their capability of interacting with serum albumin (human, HSA and bovine, BSA), by using spectroscopic techniques, CD, UV/Vis and EPR. Like other similar di-imine copper(II) complexes, most of them showed an expected preferential insertion of the metal ion at the primary N-terminal site of the protein, very selective for copper and characterized by a CD band at 560 nm. Further insertion of the copper ion at a secondary site is expected when using an excess of the metal. However, one of these studied complexes, [Cu(apyhist)H2O](2+) 1, exhibited anomalous behaviour interacting only at this secondary metal binding site of albumin, characterized by a CD band at 370 nm, and attributed to the coordination of copper at the Cys34 pocket. Analogous experiments with HSA previously treated with N-ethyl-maleimide (NEM), that oxidizes the protein Cys34 residue and obstructs the metal coordination, verified these results. Additional data obtained by EPR spectroscopy complemented those results. DFT calculations, considering some structural and electronic characteristics of such series of di-imine ligands and of the corresponding copper complexes, suggested molecular recognition of the apyhist ligand at the protein cavity as a feasible explanation for this unexpected and peculiar behaviour of complex 1.
Asunto(s)
Cobre/química , Iminas/química , Compuestos Organometálicos/química , Compuestos Organometálicos/metabolismo , Albúmina Sérica/metabolismo , Animales , Bovinos , Humanos , Imidazoles/química , Ligandos , Modelos Moleculares , Conformación Molecular , Unión Proteica , Pirazinas/química , Piridinas/química , Especies Reactivas de Oxígeno/químicaRESUMEN
Since 2000, the expansion of Sylvatic Yellow Fever (YF) has been observed in the southeast of Brazil, being detected in areas considered silent for decades. Epizootics in non-human primates (NHPs) are considered sentinel events for the detection of human cases. It is important to report epizootic events that could have impact on the conservation status of susceptible species. We describe the epizootics in NHPs, notified in state of São Paulo, Brazil, between September 2008 to August 2009. Ninety-one epizootic events, involving 147 animals, were reported in 36 counties. Samples were obtained from 65 animals (44.2%). Most of the epizootics (46.6%) were reported between March and April, the same period during which human cases of YF occurred in the state. Biological samples were collected from animals found dead and were sent to Instituto Adolfo Lutz, in São Paulo. Two samples, collected in two counties without an indication for YF vaccination, were positive for the virus. Another 48 animals were associated with YF by clinical-epidemiological linkage with laboratory confirmed cases. Because the disease in human and NHPs occurred in the same period, the detection of the virus in NHPs did not work as sentinel, but aided in the delineation of new areas of risk.
Desde 2000, vem sendo observada a expansão da febre amarela (FA) no Sudeste do Brasil, sendo detectados casos em áreas consideradas silenciosas por décadas. Epizootias em primatas não humanos (NHPs) são considerados eventos sentinela para a detecção de casos humanos. É importante relatar eventos epizoóticos que podem ter impacto sobre o estado de conservação de espécies sensíveis. Descrevemos as epizootias, notificadas em NHPs no estado de São Paulo, Brasil, entre setembro de 2008 a agosto de 2009. Noventa e um eventos epizoóticos, envolvendo 147 animais, foram notificados em 36 municípios. As amostras foram obtidas a partir de 65 animais (44,2%). A maioria das epizootias (46,6%) foram registradas entre março e abril, no mesmo período no qual YF em que casos humanos ocorreram no estado. As amostras biológicas foram coletadas de animais encontrados mortos e enviadas ao Instituto Adolfo Lutz, em São Paulo. Duas amostras, coletadas em dois municípios, sem indicação para a vacinação de febre amarela, foram positivos para o vírus. Outros 48 animais foram associados com FA por vínculo clínico-epidemiológico com casos confirmados laboratorialmente. Devido a doença em humanos e NHPs terem ocorrido no mesmo período, a detecção do vírus em NHPs não funcionou como sentinela, mas ajudou no processo de delimitação de novas áreas de risco.
Asunto(s)
Animales , Humanos , Brotes de Enfermedades/veterinaria , Enfermedades de los Monos/epidemiología , Fiebre Amarilla/veterinaria , Brasil/epidemiología , Estaciones del Año , Fiebre Amarilla/epidemiología , Zoonosis/epidemiologíaRESUMEN
Since 2000, the expansion of Sylvatic Yellow Fever (YF) has been observed in the southeast of Brazil, being detected in areas considered silent for decades. Epizootics in non-human primates (NHPs) are considered sentinel events for the detection of human cases. It is important to report epizootic events that could have impact on the conservation status of susceptible species. We describe the epizootics in NHPs, notified in state of São Paulo, Brazil, between September 2008 to August 2009. Ninety-one epizootic events, involving 147 animals, were reported in 36 counties. Samples were obtained from 65 animals (44.2%). Most of the epizootics (46.6%) were reported between March and April, the same period during which human cases of YF occurred in the state. Biological samples were collected from animals found dead and were sent to Instituto Adolfo Lutz, in São Paulo. Two samples, collected in two counties without an indication for YF vaccination, were positive for the virus. Another 48 animals were associated with YF by clinical-epidemiological linkage with laboratory confirmed cases. Because the disease in human and NHPs occurred in the same period, the detection of the virus in NHPs did not work as sentinel, but aided in the delineation of new areas of risk.
Asunto(s)
Brotes de Enfermedades/veterinaria , Enfermedades de los Monos/epidemiología , Fiebre Amarilla/veterinaria , Animales , Brasil/epidemiología , Humanos , Estaciones del Año , Fiebre Amarilla/epidemiología , Zoonosis/epidemiologíaRESUMEN
We report the first isolation of Dengue virus 4 (DENV-4) in the state of São Paulo, from two patients - one living in São José do Rio Preto and the other one in Paulo de Faria, both cities located in the Northwest region of the state. The virus isolations were accomplished in the clone C6/36 Aedes albopictus cell line, followed by indirect immunofluorescence assays, performed with type-specific monoclonal antibodies that showed positive reactions for DENV-4. The results were confirmed by Nested RT-PCR and Real-Time RT-PCR assays. The introduction of DENV-4 in a country that already has to deal with the transmission of three other serotypes increases the possibility of the occurrence of more severe cases of the disease. The importance of early detection of dengue cases, before the virus spreads and major outbreaks occur, should be emphasized.
Asunto(s)
Virus del Dengue/aislamiento & purificación , Dengue/virología , Aedes/virología , Animales , Brasil , Virus del Dengue/genética , Virus del Dengue/inmunología , Humanos , Reacción en Cadena de la Polimerasa de Transcriptasa InversaRESUMEN
We report the first isolation of Dengue virus 4 (DENV-4) in the state of São Paulo, from two patients - one living in São José do Rio Preto and the other one in Paulo de Faria, both cities located in the Northwest region of the state. The virus isolations were accomplished in the clone C6/36 Aedes albopictus cell line, followed by indirect immunofluorescence assays, performed with type-specific monoclonal antibodies that showed positive reactions for DENV-4. The results were confirmed by Nested RT-PCR and Real-Time RT-PCR assays. The introduction of DENV-4 in a country that already has to deal with the transmission of three other serotypes increases the possibility of the occurrence of more severe cases of the disease. The importance of early detection of dengue cases, before the virus spreads and major outbreaks occur, should be emphasized.
Relatamos o primeiro isolamento do vírus Dengue 4 (DENV-4) no Estado de São Paulo, de dois pacientes residentes em São José do Rio Preto e Paulo de Faria, ambos municípios localizados na região Noroeste do Estado. O isolamento do vírus foi realizado em clone C6/36, linhagem de células de Aedes albopictus seguido por imunofluorescência indireta, realizada com anticorpos monoclonais tipo específicos, que apresentou reação positiva para DENV-4. Os resultados foram confirmados por testes de Nested RT-PCR e RT-PCR em Tempo Real. A introdução do DENV-4 no país, com uma população suscetível a esse vírus e que já convive com a transmissão de outros três sorotipos, aumenta a possibilidade da ocorrência de casos mais graves da doença. Deve ser enfatizada a importância da detecção precoce de casos de dengue, antes que ocorra a propagação do vírus e que surtos importantes aconteçam.
Asunto(s)
Animales , Humanos , Virus del Dengue/aislamiento & purificación , Dengue/virología , Aedes/virología , Brasil , Virus del Dengue/genética , Virus del Dengue/inmunología , Reacción en Cadena de la Polimerasa de Transcriptasa InversaRESUMEN
The natural transmission cycle of Yellow Fever (YF) involves tree hole breeding mosquitoes and a wide array of nonhuman primates (NHP), including monkeys and apes. Some Neotropical monkeys (howler monkeys, genus Alouatta) develop fatal YF virus (YFV) infections similar to those reported in humans, even with minimum exposure to the infection. Epizootics in wild primates may be indicating YFV circulation, and the surveillance of such outbreaks in wildlife is an important tool to help prevent human infection. In 2001, surveillance activities successfully identified YF-related death in a black-and-gold howler monkey (Alouatta caraya), Rio Grande do Sul State (RGS) in southern Brazil, and the YFV was isolated from a species of forest-dwelling mosquito (Haemagogus leucocelaenus). These findings led the State Secretariat of Health to initiate a monitoring program for YF and other 18 arboviral infections in Alouatta monkeys. The monitoring program included monkey captures, reporting of monkey casualties by municipalities, and subsequent investigations. If monkey carcasses were found in forests, samples were collected in a standardized manner and this practice resulted in increased reporting of outbreaks. In October 2008, a single howler monkey in a northwestern RGS municipality was confirmed to have died from YF. From October 2008 to June 2009, 2,013 monkey deaths were reported (830 A. caraya and 1,183 A. guariba clamitans). Viruses isolation in blood, viscera, and/or immunohistochemistry led to the detection of YF in 204 of 297 (69%) (154 A. g. clamitans and 50 A. caraya) dead Alouatta monkeys tested. The number of municipalities with confirmed YFV circulation in howlers increased from 2 to 67 and 21 confirmed human cases occurred. This surveillance system was successful in identifying the largest YF outbreak affecting wild NHP ever recorded.
Asunto(s)
Alouatta , Brotes de Enfermedades/veterinaria , Enfermedades de los Monos/epidemiología , Fiebre Amarilla/veterinaria , Animales , Brasil/epidemiología , Femenino , Humanos , Masculino , Fiebre Amarilla/epidemiologíaRESUMEN
The present work evaluated the diagnostic accuracy of detection of Dengue NS1 antigen employing two NS1 assays, an immunochromatographic assay and ELISA, in the diagnostic routine of Public Health laboratories. The results obtained with NS1 assay were compared with virus isolation and, in a subpopulation of cases, they were compared with the IgM-ELISA results obtained with convalescent samples. A total of 2,321 sera samples were analyzed by one of two NS1 techniques from March to October 2009. The samples were divided into five groups: groups I, II and III included samples tested by NS1 and virus isolation, and groups IV and V included patients with a first sample tested by NS1 and a second sample tested by IgM-ELISA. Sensitivity, specificity, positive and negative predictive values, Kappa Index and Kappa Concordance were calculated. The results showed that NS1 testing in groups I, II and III had high sensitivity (98.0%, 99.5% and 99.3%), and predictive values and Kappa index between 0.9 - 1.0. Groups IV and V only had Kappa Concordance calculated, since the samples were analyzed according to the presence of NS1 antigen or IgM antibody. Concordance of 92.1% was observed when comparing the results of NS1-negative samples with IgM-ELISA. Based on the findings, it is possible to suggest that the tests for NS1 detection may be important tools for monitoring the introduction and spread of Dengue serotypes.
Asunto(s)
Anticuerpos Antivirales/sangre , Antígenos Virales/sangre , Virus del Dengue/inmunología , Dengue/diagnóstico , Inmunoglobulina M/sangre , Proteínas no Estructurales Virales/inmunología , Cromatografía de Afinidad , Dengue/inmunología , Dengue/virología , Ensayo de Inmunoadsorción Enzimática , Humanos , Sensibilidad y EspecificidadRESUMEN
The present work evaluated the diagnostic accuracy of detection of Dengue NS1 antigen employing two NS1 assays, an immunochromatographic assay and ELISA, in the diagnostic routine of Public Health laboratories. The results obtained with NS1 assay were compared with virus isolation and, in a subpopulation of cases, they were compared with the IgM-ELISA results obtained with convalescent samples. A total of 2,321 sera samples were analyzed by one of two NS1 techniques from March to October 2009. The samples were divided into five groups: groups I, II and III included samples tested by NS1 and virus isolation, and groups IV and V included patients with a first sample tested by NS1 and a second sample tested by IgM-ELISA. Sensitivity, specificity, positive and negative predictive values, Kappa Index and Kappa Concordance were calculated. The results showed that NS1 testing in groups I, II and III had high sensitivity (98.0 percent, 99.5 percent and 99.3 percent), and predictive values and Kappa index between 0.9 - 1.0. Groups IV and V only had Kappa Concordance calculated, since the samples were analyzed according to the presence of NS1 antigen or IgM antibody. Concordance of 92.1 percent was observed when comparing the results of NS1-negative samples with IgM-ELISA. Based on the findings, it is possible to suggest that the tests for NS1 detection may be important tools for monitoring the introduction and spread of Dengue serotypes.
Esse estudo avaliou a acurácia do diagnóstico por detecção do antígeno NS1 do vírus Dengue empregando-se ensaios em dois formatos, imunocromatográfico e ELISA, na rotina diagnóstica dos laboratórios de Saúde Pública. Compararam-se os resultados de NS1 com os resultados de isolamento viral e, em parte dos casos, foi feita a comparação com os resultados de IgM-ELISA, obtidos nas segundas amostras. Um total de 2.321 amostras de soros, obtidas no período de março a outubro de 2009, foram analisadas por uma das duas técnicas NS1. As amostras foram divididas em cinco grupos: I, II e III, que incluíram amostras analisadas por testes NS1 e por isolamento de vírus. Os grupos IV e V incluíram pacientes com a primeira amostra processada por NS1 e segunda por IgM-ELISA. Foram analisadas sensibilidade, especificidade, valor preditivo positivo e negativo, concordância e índice Kappa. Os resultados mostraram que os grupos I, II e III apresentaram alta sensibilidade (98,0 por cento, 99,5 por cento e 99,3 por cento), valores preditivos e índice Kappa entre 0,9 - 1,0. Nos grupos IV e V, apenas concordância foi calculada, dado que as amostras foram analisadas quanto à presença de antígeno NS1 ou de anticorpos IgM. Comparando-se os resultados negativos de NS1 com IgM-ELISA houve 92,1 por cento de concordância. Com base nas constatações feitas, é possível sugerir que a detecção de NS1 pode ser importante ferramenta para monitorar a introdução e disseminação dos sorotipos de Dengue.
Asunto(s)
Humanos , Anticuerpos Antivirales/sangre , Antígenos Virales/sangre , Virus del Dengue/inmunología , Dengue/diagnóstico , Inmunoglobulina M/sangre , Proteínas no Estructurales Virales/inmunología , Dengue/inmunología , Dengue/virología , Ensayo de Inmunoadsorción Enzimática , Cromatografía de Afinidad , Sensibilidad y EspecificidadRESUMEN
Previous studies on copper(II) complexes with oxindole-Schiff base ligands have shown their potential antitumor activity towards different cells, inducing apoptosis through a preferential attack to DNA and/or mitochondria. Herein, we better characterize the interactions between some of these copper(II) complexes and DNA. Investigations on its binding ability to DNA were carried out by fluorescence measurements in competitive experiments with ethidium bromide, using plasmidial or calf-thymus DNA. These results indicated an efficient binding process similar to that observed with copper(II)-phenanthroline species, [Cu(o-phen)(2)](2+), with binding constants in the range 3 to 9×10(2) M(-1). DNA cleavage experiments in the presence and absence of distamycin, a recognized binder of DNA, indicated that this binding probably occurs at major or minor groove, leading to double-strand DNA cleavage, and being modulated by the imine ligand. Corroborating these data, discrete changes in EPR spectra of the studied complexes were observed in the presence of DNA, while more remarkable changes were observed in the presence of nucleotides (AMP, GMP, CMP or UMP). Additional evidence for preferential coordination of the copper centers to the bases guanine or cytosine was obtained from titrations of these complexes with each nucleotide, monitored by absorption spectral changes. Therefore, the obtained data point out to their action as groove binders to DNA bases, rather than as intercalators or covalent cross-linkers. Further investigations by SDS PAGE using (32)P-ATP or (32)P-oligonucleotides attested that no hydrolysis of phosphate linkage in DNA or RNA occurs, in the presence of such complexes, confirming their main oxidative mechanism of action.
Asunto(s)
Complejos de Coordinación/química , Cobre , ADN Circular/química , ADN/química , Indoles/química , Algoritmos , Unión Competitiva , Dicroismo Circular , División del ADN , Distamicinas/química , Espectroscopía de Resonancia por Spin del Electrón , Etidio/química , Sustancias Intercalantes/química , Oxindoles , Bases de Schiff/química , Espectrometría de FluorescenciaRESUMEN
INTRODUCTION: Following yellow fever virus (YFV) isolation in monkeys from the São José do Rio Preto region and two fatal human autochthonous cases from the Ribeirão Preto region, State of São Paulo, Brazil, two expeditions for entomological research and eco-epidemiological evaluation were conducted. METHODS: A total of 577 samples from humans, 108 from monkeys and 3,049 mosquitoes were analyzed by one or more methods: virus isolation, ELISA-IgM, RT-PCR, histopathology and immunohistochemical. RESULTS: Of the 577 human samples, 531 were tested by ELISA-IgM, with 3 positives, and 235 were inoculated into mice and 199 in cell culture, resulting in one virus isolation. One sample was positive by histopathology and immunohistochemical. Using RT-PCR, 25 samples were processed with 4 positive reactions. A total of 108 specimens of monkeys were examined, 108 were inoculated into mice and 45 in cell culture. Four virus strains were isolated from Alouatta caraya. A total of 931 mosquitoes were captured in Sao Jose do Rio Preto and 2,118 in Ribeirão Preto and separated into batches. A single isolation of YFV was derived from a batch of 9 mosquitoes Psorophora ferox, collected in Urupês, Ribeirão Preto region. A serological survey was conducted with 128 samples from the municipalities of São Carlos, Rincão and Ribeirão Preto and 10 samples from contacts of patients from Ribeirão Preto. All samples were negative by ELISA-IgM for YFV. CONCLUSIONS: The results confirm the circulation of yellow fever, even though sporadic, in the Sao Paulo State and reinforce the importance of vaccination against yellow fever in areas considered at risk.
Asunto(s)
Enfermedades Transmisibles Emergentes/epidemiología , Culicidae/clasificación , Haplorrinos/virología , Insectos Vectores/clasificación , Enfermedades de los Monos/epidemiología , Fiebre Amarilla/epidemiología , Animales , Brasil/epidemiología , Enfermedades Transmisibles Emergentes/diagnóstico , Enfermedades Transmisibles Emergentes/transmisión , Enfermedades Transmisibles Emergentes/veterinaria , Haplorrinos/clasificación , Humanos , Enfermedades de los Monos/diagnóstico , Enfermedades de los Monos/transmisión , Estudios Seroepidemiológicos , Fiebre Amarilla/diagnóstico , Fiebre Amarilla/transmisión , Fiebre Amarilla/veterinariaRESUMEN
After detecting the death of Howlers monkeys (genus Alouatta) and isolation of yellow fever virus (YFV) in Buri county, São Paulo, Brazil, an entomological research study in the field was started. A YFV strain was isolated from newborn Swiss mice and cultured cells of Aedes albopictus - C6/36, from a pool of six Haemagogus (Conopostegus) leucocelaenus (Hg. leucocelaenus) mosquitoes (Dyar & Shannon) collected at the study site. Virus RNA fragment was amplified by RT-PCR and sequenced. The MCC Tree generated showed that the isolated strain is related to the South American I genotype, in a monophyletic clade containing isolates from recent 2008-2010 epidemics and epizootics in Brazil. Statistical analysis commonly used were calculated to characterize the sample in relation to diversity and dominance and indicated a pattern of dominance of one or a few species. Hg. leucocelaenus was found infected in Rio Grande do Sul State as well. In São Paulo State, this is the first detection of YFV in Hg. leucocelaenus.