Biochemical and Behavioral Responses in Zebrafish Exposed to Imidacloprid Oxidative Damage and Antioxidant Responses.

Imidacloprid (IMI) is an insecticide used worldwide, a neonicotinoid that could cause toxicity in non-target organisms. Zebrafish (Danio rerio) is a model organism widely used in different fields of research such as behavioral studies, biochemical parameters as well as neurotoxicity research. Here, we investigate whether the exposure to three concentrations (0.15, 15, and 45 µg/L) of IMI for 96 h alters responses in zebrafish. Oxidative stress parameters and acetylcholinesterase activity (AChE) as well as the behavioral responses of locomotion were measured. IMI exposure decreased distance traveled in fish exposed to the 45 µg/L. In the exploratory activity, time spent and transitions to the top area of the water column decreased in fish exposed to all concentrations of IMI. In addition, exposures to 45 and 15 µg/L of IMI decreased episodes of erratic movement in the zebrafish. Exposures to IMI at a concentration of 45 µg/L decreased the time spent in erratic movements and increased the time spent with no movement (i.e., "freezing"). Glutathione S-transferase (GST) activity was increased in the brain of zebrafish exposed for 96 h to concentrations of 0.15 and 45 µg/L. Brain AChE activity was reduced and the levels of carbonyl protein (CP) increased in brain of zebrafish at concentrations of 15 and 45 µg/L. Lipid peroxidation measured by TBARS and, also non-protein thiols (NPSH) did not show any variation in the brain of zebrafish exposed to IMI. Changes in the activity of cholinergic neurotransmitters in the brain tissues of zebrafish indicate IMI toxicity. Exposures of fish over 96 h to IMI at a nominal concentration of 45 µg/L caused more extensive sublethal responses in zebrafish, but this concentration is well above those expected in the aquatic environment. Studies are warranted to evaluate the effects on behavior and biomarker responses in fish exposed over longer periods to IMI at environmentally relevant concentrations.

Seasonal factors driving biochemical biomarkers in two fish species from a subtropical reservoir in southern Brazil: An integrated approach.

Reservoirs are lentic man-made waterbodies resulting from river damming processes. Pollutants coming from adjacent areas can accumulate in the water and sediment of these modified freshwater environments. Fish are often found in reservoirs occupying several trophic niches. Biochemical biomarkers are early warning signals of environmental disturbance to an organism. It is essential to understand how pollutants, abiotic variables and biochemical biomarker responses behave throughout the seasons to implement biomonitoring programs. Loricariichthys anus and Geophagus brasiliensis were collected, and abiotic variables were seasonally measured for one year, at six sampling sites in Passo Real reservoir, in a subtropical region of Southern Brazil. Biochemical biomarkers were analyzed in four tissues of both fish species, as well as metal and pesticide concentrations in the reservoir's water and sediment. Redundancy analysis (RDA) was carried out to find the temporal relationship between biomarkers and environmental variables. RDA has clearly shown the separation of seasons for both species. Azoxystrobin, simazine and propoxur were the pesticides mostly contributing to the variation, whereas metals had lesser contribution to it. Seasonality appears to be the main factor explaining biomarkers' variability. PERMANOVA has confirmed the effect of temperature and dissolved oxygen on biomarkers of both fish species. Thus, it is hard to differentiate if the fluctuation in biomarkers' responses only reflects the normal state of organisms or it is a biological consequence from negative effects of fish exposure to several types of pollution (sewage, pesticides, and fertilizers) entering this aquatic system. In this study, to circumvent the seasonality issue on biomonitoring, the analysis of biomarkers on these fish should not be carried out in organs directly affected by temperature (such as liver and gills), or during reproduction periods (mainly in Spring).

Exposure to different glyphosate formulations on the oxidative and histological status of Rhamdia quelen.

Due to the wide use of glyphosate (GLY) in soybean cultivation, their residues in the environment may affect non-target organisms such as fish, developing toxic effects. Despite GLY being widely used in Brazil, there are few studies comparing the effects of commercial formulations in native freshwater fish species. Silver catfish (Rhamdia quelen) were exposed to three different commercial formulations of GLY 48% (Orium(®), Original(®) and Biocarb(®)) at 0.0, 2.5 and 5.0 mg/L for 96 h. The effects in thiobarbituric acid-reactive substances (TBARS), catalase (CAT), superoxide dismutase (SOD), glutathione-S-transferase (GST) and histological alterations were analysed in the liver, whereas alanine aminotransferase (ALT) and aspartate aminotransferase (AST) were studied in the plasma. In the liver, TBARS levels increased and CAT decreased in all treatments and herbicides tested in comparison with the control group. The SOD increased at 2.5 mg/L of Orium(®), Original(®) and 5.0 mg/L Orium(®) and Biocarb(®), whereas GST increased at 2.5 mg/L Orium(®) and decreased at 2.5 mg/L Biocarb(®) when compared to the control group. The main histopathological alterations in hepatic tissue were vacuolisation, leucocyte infiltration, degeneration of cytoplasm and melanomacrophage in all GLY treatments. The ALT decreased after exposure to 2.5 mg/L of Biocarb(®) and AST increased at 2.5 mg/L of Orium(®), Original(®) and 5.0 mg/L of Biocarb(®) in comparison with the control group. In summary, the oxidative damage generated by GLY may have caused the increased formation of free radicals that led to the histological alterations observed in hepatocytes.

Spatial and temporal biomarkers responses of Astyanax jacuhiensis (Cope, 1894)(Characiformes: Characidae) from the middle rio Uruguai, Brazil

Due to intense agricultural activity in the rio Uruguai (South Brazil), there is the potential for aquatic contamination by agrochemicals. In this region, there are many reservoirs to meet the water demand for rice fields, forming lentic environments. In line with this information, the aim of this study was to show a comparative analysis of some biomarkers, such as lipid peroxidation (TBARS), gluthatione S-transferase (GST), non-protein thiols (NPSH), amino acids (AA) and piscine micronucleus tests (MNE) in Astyanax jacuhiensis from lentic and lotic environments in the middle rio Uruguai region, comparing warm and cold seasons. Eight pesticides were found in water samples, with propoxur having the highest concentration found in both environments and seasons. Fish from the warm season showed higher levels of biochemical biomarkers, and fish from the cold season showed higher levels of MNE and AA. TBARS and AA presented higher levels in fish from the river, while GST, NPSH, MNE and AA presented higher levels in fish from dams. These environments have different characteristics in terms of redox potential, aeration, sedimentation, trophic structure, agrochemicals input and others, which may affect the physiological and biochemical responses of fish in against adverse situations.

Devido à intensa atividade agrícola no rio Uruguai (Sul do Brasil), há potencial para contaminação aquática por agrotóxicos. Há muitos reservatórios para atender a demanda de água de campos de arroz, formando ambientes lênticos. De acordo com estas informações, o objetivo do presente estudo foi mostrar uma análise comparativa de alguns biomarcadores como a peroxidação lipídica (TBARS), glutationa S-transferase (GST), tióis não-protéicos (NPSH), aminoácidos (AA) e teste písceo de micronúcleos (MNE) em Astyanaxjacuhiensis amostrados em ambientes lóticos e lênticos da região do médio rio Uruguai, comparando estações quentes e frias. Oito pesticidas foram encontrados em amostras de água, sendo propoxur a maior concentração encontrada em ambos os ambientes e estações. Peixes da estação quente apresentaram maiores níveis de biomarcadores bioquímicos e peixes da estação fria apresentaram maiores níveis de MNE e AA. TBARS e AA apresentaram maiores níveis nos peixes de rio, enquanto GST, NPSH, MNE e AA apresentaram níveis mais elevados em peixes da represa. Estes ambientes têm características diferentes, com potencial redox, aeração, sedimentação, estrutura trófica, a entrada de agroquímicos e outros que podem afetar as respostas fisiológicas e bioquímicas de peixe contra situação adversa.

Integrated assessment of biomarker response in carp (Cyprinus carpio) and silver catfish (Rhamdia quelen) exposed to clomazone.

Clomazone is considered a potential contaminant of groundwater and is persistent in the environment. To verify the effects of clomazone in Cyprinus carpio and Rhamdia quelen, a method that combines biomarker responses into an index of "integrated biomarker response" (IBR) was used for observed biological alterations in these species. Thiobarbituric acid-reactive substances in liver of carp and silver catfish decreased at both concentrations tested. However, in muscle it increased in carp at 3 mg/L and silver catfish at 6 mg/L. Protein carbonyl increased in liver (3 and 6 mg/L) and muscle (6 mg/L) of carp. In carp, superoxide dismutase (SOD) increased at 3 mg/L and catalase at 6 mg/L. In silver catfish, SOD in liver decreased at 3 mg/L. Glutathione-S-transferase increased at 3 mg/L in muscle of carp. Nonprotein thiol levels decreased at both concentrations in liver of silver catfish and muscle of carp. In silver catfish, acetylcholinesterase (AChE) decreased in brain at 6 mg/L. Nevertheless, AChE in muscle of both species increased at 3 and 6 mg/L. IBR was standardized scores of biomarker responses and was visualized using star plots. The IBR values shown that in carp there was predominantly an induction of parameters, whereas in silver catfish there was inhibition of these responses. In this way, IBR may be a practical tool for the identification of biological alterations in fish exposed to pesticides. In the present study, IBR was efficient for comparisons of fish species using clomazone. This study may serve as a base for evaluation of other pesticides in the rice field, environment, or laboratory experiment.

A avaliação do sistema de referência e contrarreferência na atenção secundária em Odontologia / Assessment of the reference and counter-reference system in secondary dentistry care

Para o alcance da integralidade em saúde bucal, é necessária a organização da "porta de entrada" desse sistema, ou seja, da atenção básica e, sobretudo, da sua interligação com a atenção secundária. Objetivo: avaliar o sistema de referência e contrarreferência nos procedimentos de atenção secundária na área odontológica em relação ao fluxo, à qualidade de atendimento e ao acesso. Materiais e método: trata-se de um estudo do tipo observacional exploratório para análise de fluxo, qualidade de atendimento e acesso dos encaminhamentos para a atenção secundária de 12 Unidades de Saúde da Família (USF) e 20 Unidades Básicas de Saúde (UBS) com equipes de saúde bucal. Na primeira fase do estudo, foram identificados os usuários (n = 101) que procuraram o Centro de Especialidades Odontológicas (CEO) para tratamento no período de agosto a dezembro de 2011. Realizou-se entrevista estruturada com questões abertas referentes ao tempo de espera para o atendimento especializado desde o encaminhamento pela atenção básica, qualidade do atendimento, satisfação do usuário e acesso. Na segunda fase do estudo, foram aplicadas para os mesmos pacientes mais duas questões referentes ao retorno nas consultas da atenção básica. Resultados: a maioria dos entrevistados relatou ter esperado de uma semana a um mês para o atendimento na atenção especializada, 95% deles não tiveram queixas do atendimento e 66,66% dos pacientes atendidos no CEO não retornaram para a atenção básica. Conclusão: nota-se a existência de um fluxo de atendimento de usuários da atenção básica para a atenção secundária em saúde bucal em Piracicaba (SP), tendo os usuários demonstrado satisfação com o atendimento. Contudo, a contrarreferência foi significativamente deficiente, considerando que a maioria dos pacientes não voltou para a atenção básica.

Achieving integrality in oral health requires the organization of this system's "gateway", that is, of primary care and foremost of its connection to secondary care. Objective: to assess the reference and counter-reference system of secondary care procedures in dentistry concerning flow, service quality, and access. Materials and method: observational exploratory study of flow analysis, service quality, and access of referrals to secondary care of 12 Family Health Units (FHU) and 20 Basic Health Units (BHU) with oral health teams. In the first stage of the study users (n = 101) who sought the Dental Specialty Center (DSC) for treatment from August to December 2011 were identified. We conducted structured interviews with open questions about the waiting time for specialized care from the time of referral provided by primary care, service quality, user satisfaction, and access. In the second stage of the study we addressed the same patients with two more questions regarding their return for primary care appointments. Results: most respondents reported having waited from 1 week to 1 month for care in the specialized center, 95% of them had no complaints, and 66.66% of the patients treated at the DSC did not return for primary care. Conclusion: there is a service flow from users of primary care to secondary care in the oral health system in the city of Piracicaba (SP) - Brazil. Users were satisfied with the service; however, counter-reference was significantly deficient since most patients did not return to primary care.

Implementación de un programa de estimulación cognitiva en personas con demencia tipo Alzheimer: un estudio piloto en chilenos de la tercera edad / Implementation of a Cognitive Stimulation Program for People with Alzheimer Disease: A Pilot Study in a Chilean Elderly Sample

La Terapia de Estimulación Cognitiva (TEC) es una intervención psicosocial para personas con demencia que ha obtenido buenos resultados en población anglosajona. El objetivo de este estudio fue evaluar la eficacia de la TEC en una muestra de personas chilenas. Participaron 22 pacientes con diagnóstico de Enfermedad de Alzheimer (EA) en fase leve a moderada, pertenecientes a un centro asistencial de la ciudad de Quillota, Chile. Para determinar la eficacia del programa, se definió un diseño experimental mixto 2x2 de medidas repetidas, asignándose aleatoriamente la muestra a dos grupos: intervención (GI) y control (GC). Se establecieron tres dimensiones para evaluar: cognición, calidad de vida y capacidad funcional de la persona con demencia. Posterior a la intervención, el GI presentó una mejoría significativa en sus indicadores de deterioro cognitivo y calidad de vida; por el contrario, el GC no evidenció cambios positivos en ninguna dimensión, empeorando el declive cognitivo. Ninguno de los grupos experimentó cambios significativos en la capacidad funcional. Si bien en la comparación intergrupo no existieron diferencias significativas en ninguna variable, el GI presentó una mejoría sustancial de la función cognitiva, en comparación con el aumento en la progresión del deterioro cognitivo en el GC. Se recomienda que futuras investigaciones contrasten dichos resultados utilizando una muestra más grande de personas con EA.

Cognitive Stimulation Therapy (CST) is a psychosocial intervention for people with dementia that has been successful in Anglo-Saxon population. The aim of this study was to assess the effectiveness of CST in a sample of Chilean elders. The participants were 22 patients diagnosed with Alzheimer's disease (AD) in mild to moderate stage, who were living in a residential care home in the town of Quillota, Chile. In order to determine the effectiveness of the program, an experimental mixed design 2x2 (repeated measures) was employed. The sample was randomly assigned into two groups: intervention group (IG) and control group (CG). Three dimensions were assessed: cognition, quality of life and functional ability. After the intervention, the IG presented a significant improvement in their cognitive function and quality life. In contrast, the CG did not show positive changes in any dimension. In fact, CG showed a worsening in its cognitive deterioration. Both groups did not showed significant changes in functional ability. Even though intergroup comparisons did not yield significant differences, the IG showed an important improvement in cognitive function, compared with an increase in the progression of cognitive impairment in the CG. It is recommended that future research will contrast these results using a larger sample of people with AD.

Transient reticular gallbladder wall thickening in severe dengue fever: a reliable sign of plasma leakage.

BACKGROUND: Dengue fever (DF) is an acute infection caused by a flavivirus. Although most patients present mild symptoms, some progress to a severe condition characterized by hypovolemic shock and hemorrhagic phenomena. The main feature of this severe form of DF is plasma leakage. Gallbladder wall thickening (GBWT), ascites and pleural effusion represent the sonographic triad of plasma leakage in DF. OBJECTIVE: To evaluate the plasma leakage triad in severe DF with emphasis on the GBWT. MATERIALS AND METHODS: Thirty-seven children with severe DF underwent abdominal US on the day of admittance and on the day of discharge, or 7 days after the first examination if the child was still hospitalized. RESULTS: Of the 37 children, 33 (89.2%) presented GBWT, 29 (78.4%) ascites and 26 (70.3%) pleural effusion. All of these findings had resolved by the second examination. Of the 33 GBWTs, 29 (87.9%) presented a reticular pattern, which could be considered typical of plasma leakage in patients with severe DF. CONCLUSION: GBWT, ascites and pleural effusion are transient findings in DF. The authors have described a typical reticular pattern of GBWT that can be used to diagnose and follow up on patients with severe DF and should not be considered an acalculous cholecystitis.