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Traumatic brain injury (TBI) is a neurotrauma with a complex pathophysiology caused by an external mechanical force. This global public health problem is a leading cause of death and disability in young adults. In this scenario, many models were developed to try to simulate human TBI. The weight drop model allows the investigation of the pathophysiological cascades of TBI without surgical interference. In this protocol, a new closed-head weight-drop rat model consisting of a 48.5g weight projectile that free falls from 1.10m high onto the skull of the animals was built. We classify the present TBI model performed as moderately severe due to its mortality rate. Animals from TBI and Control (Sham) groups underwent weight for 7 days and temperature assessments within 1 hour after TBI and for 7 days. Results demonstrated that the TBI group showed less body weight gain in the days after the injury. Temperature oscillations within the first-hour post-injury and on the 3rd day after injury were observed. As the results of this study demonstrated similarity to human TBI vital parameters, this new adaptation of the Weight-drop model injury can be a suitable candidate for translational studies.â¢We developed a novel closed head focal traumatic brain injury using a projectile.â¢This TBI model does not require surgical intervention.â¢The validation of this method demonstrates that the vital parameters of the injured rats exhibit similarities with those of TBI patients.
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A interação com videogame aumentou significativamente na pandemia de COVID-19. Por outro lado, um aspecto atencional que pode apresentar alterações relacionadas à quantidade de interação com videogames de ação é o mindfulness. Portanto, o objetivo deste estudo foi verificar uma possível relação entre o uso de videogames de ação (em horas semanais), o mindfulness e o medo da COVID-19. Para tanto, solicitou-se a jogadores e não jogadores de videogames de ação com idades entre 18 e 29 anos (n = 384, M = 21,6, DP = 2,6) que respondessem à Escala de Medo da COVID-19 e à Escala de Facetas do Mindfulness. Os resultados não demonstraram relação significativa entre uso de videogames de ação e mindfulness, mas apontaram que jogadores de videogame de ação apresentaram menos medo da COVID-19. Discute-se como o escapismo proporcionado pelo jogo pode explicar, em parte, uma diminuição da atenção a informações relativas à doença
Interaction with video games increased significantly in the COVID-19 pandemic. On the other hand, an attentional aspect that may show changes related to the amount of interaction with action video games is mindfulness. Therefore, the objective of this study was to verify a possible relationship between the use of action video games (in weekly hours), mindfulness and fear of COVID-19. To this end, players and non-players of action video games aged between 18 and 29 years (n = 384, M = 21.6, SD = 2.6) were asked to respond to the Covid Fear Scale and the Facets of Mindfulness. Results did not demonstrate a significant relationship between the use of action video games and mindfulness, but showed that action video game players were less afraid of COVID-19. It is discussed how the escapism provided by the game can partly explain a decrease in attention to information related to the disease
La interacción con videojuegos aumentó en la pandemia de COVID-19. Por otro lado, un aspecto atencional que puede presentar cambios relacionados con la cantidad de interacción con los videojuegos de acción es el mindfulness. Luego, el objetivo de este estudio fue verificar una relación entre uso de video-juegos de acción, mindfulness y miedo al COVID-19. Se pidió a jugadores y no jugadores de videojuegos de acción de entre 18 y 29 años (n = 384, M = 21,6, SD = 2,6) que respondieran a la Escala de Miedo al COVID y la Escala de Facetas de Mindfulness. Los resultados no demostraron una relación significativa entre uso de videojuegos de acción y mindfulness, pero señalaron que jugadores de videojuegos de acción tenían menos miedo a la COVID-19. Se discute cómo el escapismo proporcionado por el juego explicaría en parte una disminución en la atención a la información relacionada con la enfermedad
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AdultoRESUMO
The brain-derived neurotrophic factor (BDNF) is a neurotrophin recognized to play a major role in neuroplastic modifications associated to drug abuse, being involved in various behavioral changes found in drug use disorders, such as drug sensitization, craving and relapses. These neuroplastic changes were shown to affect the prefrontal cortex functions, which can be briefly measured through cognitive tests such as the Frontal Assessment Battery (FAB). In this study we investigated the BDNF mRNA expression in peripheral blood lymphocytes of crack-cocaine use disorder (CUD) and alcohol use disorder (AUD) patients, after drug detoxification treatment, using a real-time PCR approach and examining its association to FAB performance. BDNF mRNA expression was found to be higher by 2.25-fold in CUD patients and by 2-fold in the AUD patients when normalized to controls, and these values were found to be associated with FAB scores. This preliminary study evaluates, for the first time, BDNF mRNA expression in leukocytes and its relationship to FAB scores in crack-cocaine and alcohol use disorder patients.
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FosB gene heterodimerizes with Jun family proteins to form activator protein 1 (AP-1) complexes that bind to AP-1 sites in responsive genes to regulate transcription in all cells. The genic expression of FosB seems to be modified after long time exposure to drugs of abuse and these changes may be involved in craving and addicted behavior. This study investigated the FosB mRNA expression in peripheral blood lymphocytes of drug addicted patients using real-time PCR approach. Thus, patients with crack-cocaine use disorder (CUD, n = 10), alcohol use disorder (AUD, n = 12), and healthy non-addicted subjects (CONT, n = 12) were assessed. FosB mRNA expression was reduced by 1.15-fold in CUD and 2.17-fold in AUD when compared to CONT. Hedge's effect size gs over log FosB/Act was of 0.66 for CUD and of 0.30 for AUD when compared to controls. This study showed that FosB mRNA expression was detected in lymphocytes from peripheral blood for the first time, and it was less expressed in drug addicted patients. This molecular technique may constitute a potential peripheral marker for substance use disorder.
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The consequences of exposure to environmental contaminants have shown significant effects on brain function and behavior in different experimental models. The endocrine-disrupting chemicals (EDC) present various classes of pollutants with potential neurotoxic actions, such as organotins (OTs). OTs have received special attention due to their toxic effects on the central nervous system, leading to abnormal mammalian neuroendocrine axis function. OTs are organometallic pollutants with a tin atom bound to one or more carbon atoms. OT exposure may occur through the food chain and/or contaminated water, since they have multiple applications in industry and agriculture. In addition, OTs have been used with few legal restrictions in the last decades, despite being highly toxic. In addition to their action as EDC, OTs can also cross the blood-brain barrier and show relevant neurotoxic effects, as observed in several animal model studies specifically involving the development of neurodegenerative processes, neuroinflammation, and oxidative stress. Thus, the aim of this short review is to summarize the toxic effects of the most common OT compounds, such as trimethyltin, tributyltin, triethyltin, and triphenyltin, on the brain with a focus on neuronal damage as a result of oxidative stress and neuroinflammation. We also aim to present evidence for the disruption of behavioral functions, neurotransmitters, and neuroendocrine pathways caused by OTs.
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Marijuana (Cannabis sativa) is one of the most widely used illicit drugs in the world. Its use is associated with impairments in cognitive function. We previously reported that Δ(9)-tetrahydrocannabinol (Δ(9)-THC), the primary psychoactive component of marijuana, impaired spatial working memory in the radial maze task when injected intracortically (IC) into the medial prefrontal cortex (mPFC) of rats. Here, we used this paradigm to evaluate the involvement of prefrontal dopamine receptors in working memory disruption induced by Δ(9)-THC. Intracortical pre-treatment of animals with either the D(1)- or D(2)-like dopamine receptor antagonists SCH 23390 or clozapine, respectively, significantly reduced the number of errors rats made in the radial maze following treatment with Δ(9)-THC also administered intracortically. These results were obtained in the absence of locomotor impairment, as evidenced by the time spent in each arm a rat visited. Our findings suggest that prefrontal dopamine receptors are involved in Δ(9)-THC-induced disruption of spatial working memory. This interaction between the cannabinoid system and dopamine release in the PFC contributes to new directions in research and to treatments for cognitive dysfunctions associated with drug abuse and dependence.
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Benzazepinas/farmacologia , Clozapina/farmacologia , Dronabinol/antagonistas & inibidores , Transtornos da Memória/induzido quimicamente , Transtornos da Memória/tratamento farmacológico , Córtex Pré-Frontal/efeitos dos fármacos , Animais , Benzazepinas/uso terapêutico , Clozapina/uso terapêutico , Modelos Animais de Doenças , Antagonistas de Dopamina/farmacologia , Antagonistas de Dopamina/uso terapêutico , Masculino , Aprendizagem em Labirinto/efeitos dos fármacos , Aprendizagem em Labirinto/fisiologia , Transtornos da Memória/fisiopatologia , Córtex Pré-Frontal/fisiologia , Psicotrópicos/antagonistas & inibidores , Ratos , Ratos WistarRESUMO
INTRODUCTION: AIDS among older adults is a public health problem emerging. This study compared the demographic and epidemiological profile and the evolution and trend of the epidemic among men and women aged 50 years and older and 20 to 39 years affected by AIDS in the State of Espirito Santo, Brazil. METHODS: We conducted a time serie study with secondary data from SINAN/AIDS for the period January 1991 to December 2006. RESULTS: In this period were 3,382 reported cases of AIDS in individuals aged 20 to 39 years and 551 cases among individuals with 50 years or older. In both age groups most affected are men. There are differences related to race or color, where the majority of the older is white (45.3% - p-value = 0.044) and the young brown (44.7%, p = 0.003). Illiteracy prevails among the older (17.7% - p-value = 0.001). More than half (80%) of the notifications occurred in cities of medium to large. The main risk factor was heterosexual in both the age groups more frequently to the group of 50 or more (77.3% - p = 0.0001). The cumulative incidence is higher for the age group 20 to 39 years (R(2) = 0.68), but is increasing proportionally between the two bands over the years, with a significant upward trend for both (p<0.01). CONCLUSIONS: The AIDS epidemic among the elderly can be seen growing among older on the Espirito Santo State.
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Síndrome da Imunodeficiência Adquirida/epidemiologia , Síndrome da Imunodeficiência Adquirida/transmissão , Adulto , Distribuição por Idade , Idoso , Brasil/epidemiologia , Escolaridade , Feminino , Humanos , Incidência , Masculino , Pessoa de Meia-IdadeRESUMO
INTRODUÇÃO: A AIDS entre adultos mais velhos é um problema de saúde pública emergente. Comparamos o perfil epidemiológico e sociodemográfico, bem como a evolução e a tendência da epidemia entre homens e mulheres nas faixas etárias de 50 anos e mais e 20 a 39 anos acometidos pela AIDS, no Estado do Espírito Santo, Brasil. MÉTODOS: Realizamos um estudo de série temporal, com dados secundários do SINAN/AIDS, no período de Janeiro de 1991 a dezembro 2006. RESULTADOS: Neste período, foram notificados 3.382 casos de AIDS em indivíduos com idade entre 20 e 39 anos e 551 casos entre indivíduos com 50 anos e mais. Em ambas as faixas etárias, os mais acometidos são os homens. Há diferenças referentes à raça/cor, em que a maioria dos mais velhos são brancos (45,3 por cento - p-valor = 0,044) e os mais jovens pardos (44,7 por cento, p-valor = 0,003). O analfabetismo prevalece entre os mais velhos (17,7 por cento - p-valor = 0,001). Mais da metade (80 por cento) das notificações ocorreu em municípios de médio a grande porte. A principal categoria de exposição foi a heterossexual, em ambos as faixas etárias, com maior frequência para o grupo de 50 anos ou mais (77,3 por cento - p=0,0001). A incidência acumulada é maior para a faixa etária de 20 a 39 anos (R²=0,68); porém, vem aumentando proporcionalmente, entre as duas faixas no decorrer dos anos, com tendência de crescimento significativa para ambas (p <0,01). CONCLUSÕES: A epidemia de AIDS pode ser considerada em expansão entre mais velhos no Espirito Santo.
INTRODUCTION: AIDS among older adults is a public health problem emerging. This study compared the demographic and epidemiological profile and the evolution and trend of the epidemic among men and women aged 50 years and older and 20 to 39 years affected by AIDS in the State of Espirito Santo, Brazil. METHODS: We conducted a time serie study with secondary data from SINAN/AIDS for the period January 1991 to December 2006. RESULTS: In this period were 3,382 reported cases of AIDS in individuals aged 20 to 39 years and 551 cases among individuals with 50 years or older. In both age groups most affected are men. There are differences related to race or color, where the majority of the older is white (45.3 percent - p-value = 0.044) and the young brown (44.7 percent, p = 0.003). Illiteracy prevails among the older (17.7 percent - p-value = 0.001). More than half (80 percent) of the notifications occurred in cities of medium to large. The main risk factor was heterosexual in both the age groups more frequently to the group of 50 or more (77.3 percent - p = 0.0001). The cumulative incidence is higher for the age group 20 to 39 years (R² = 0.68), but is increasing proportionally between the two bands over the years, with a significant upward trend for both (p<0.01). CONCLUSIONS: The AIDS epidemic among the elderly can be seen growing among older on the Espirito Santo State.
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Adulto , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Síndrome da Imunodeficiência Adquirida/epidemiologia , Distribuição por Idade , Síndrome da Imunodeficiência Adquirida/transmissão , Brasil/epidemiologia , Escolaridade , IncidênciaRESUMO
Dopamine (DA) and N-methyl-D-aspartate (NMDA) receptors seem to be critically involved in working memory processing in the medial prefrontal cortex (mPFC). Effects of NMDA receptors blockade on dopamine D1 receptors activation in the mPFC on spatial working memory was investigated. Adult male Wistar rats, well trained in an eight-arm radial maze and bilaterally cannulated in the mPFC, received intracortical administrations of saline (SAL) or SKF-38393 (DA D1 receptor agonist) followed, 10 min later, by MK-801 (non-competitive NMDA receptor antagonist). They were tested in 1 h delayed tasks after 5 min of the second administration. SKF-38393 (0.56 and 1.8 microg) was disruptive to working memory, increasing significantly the number of errors in the 1 h post-delay performance when administered into the mPFC. MK-801, at doses with no significant effects alone (0.32 or 1.0 microg), reduced significantly the disruptive effect of 0.56 microg SKF-38393. These results showed that the disruptive effect of DA D(1) receptors activation in the mPFC on working memory was significantly reduced by an open-channel NMDA receptor blockade, suggesting that the processing of working memory in the mPFC involving DA D1 receptors depend, at least in part, of NMDA receptors activity in this cortical area.