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Adrenergic receptor β3 is involved in the memory consolidation process in mice BJMBR
Souza-Braga,P.; Lorena,F.B.; Nascimento,B.P.P.; Marcelino,C.P.; Ravache,T.T.; Ricci,E.; Bernardi,M.M.; Ribeiro,M.O..
Attention and emotion have a positive impact on memory formation, which is related to the activation of the noradrenergic system in the brain. The hippocampus and amygdala are fundamental structures in memory acquisition, which is modulated by noradrenaline through the noradrenergic receptors. Pharmacological studies suggest that memory acquisition depends on the action of both the β3 (β3-AR) and β2 (β2-AR) receptor subtypes. However, the use of animal models with specific knockout for the β3-AR receptor only (β3-ARKO) allows researchers to more accurately assess its role in memory formation processes. In the present study, we evaluated short- and long-term memory acquisition capacity in β3-ARKO mice and wild-type mice at approximately 60 days of age. The...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Adrenergic receptors; Memory; GLUT3; Β3-AR.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2018001000607
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Anabolic-androgenic steroids cycle administration decreases anxious-like behavior but does not affect long-term memory acquisition in rats Biological Sciences
Oliveira, Luís Flávio Souza de; Staudt, Miriam; Machado, Michel Mansur; Fuentefria, Alexandre Meneghello.
The steroid hormones are lipids in nature, which play crucial roles in several metabolic and behavioral pathways in mammals. Drug therapy uses sterol hormones for treating some disturbances linked with its deficiency; however, the illicit use of these hormones by amateur and elite athletes to enhance performance or body appearance may lead to several health issues. In this study we evaluated the anxious-like behavior and the long-term memory acquisition of male rats undergoing sedentary life-style or physical effort, with or without anabolic-androgenic steroids (ASC) treatment. The results showed a decrease in anxious-like behavioral levels in rats that received ASC treatment associated or not with physical effort, but this treatment did not affect the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: 2.10.00.00-0 androgens; Physical exercise; Memory; Anxiety Farmacologia de esteroides androgênicos.
Ano: 2019 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/45014
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Anterograde effects of a single electroconvulsive shock on inhibitory avoidance and on cued fear conditioning BJMBR
Oliveira,M.G.M.; Bueno,O.F.A.; Gugliano,E.B..
A single electroconvulsive shock (ECS) or a sham ECS was administered to male 3-4-month-old Wistar rats 1, 2, and 4 h before training in an inhibitory avoidance test and in cued classical fear conditioning (measured by means of freezing time in a new environment). ECS impaired inhibitory avoidance at all times and, at 1 or 2 h before training, reduced freezing time before and after re-presentation of the ECS. These results are interpreted as a transient conditioned stimulus (CS)-induced anxiolytic or analgesic effect lasting about 2 h after a single treatment, in addition to the known amnesic effect of the stimulus. This suggests that the effect of anterograde learning impairment is demonstrated unequivocally only when the analgesic/anxiolytic effect is...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Electroconvulsive shock; Memory; Cued fear conditioning; Inhibitory avoidance; Anxiolytic effect; Analgesic effect.
Ano: 1998 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000800009
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Cognitive performance of young and elderly subjects on the free word recall memory test: effect of presentation order on recall order BJMBR
Santos-Galduróz,R.F.; Oliveira,F.G.; Galduróz,J.C.F.; Bueno,O.F.A..
The influence of aging on memory has been extensively studied, but the importance of short-term memory and recall sequence has not. The objective of the current study was to examine the recall order of words presented on lists and to determine if age affects recall sequence. Physically and psychologically healthy male subjects were divided into two groups according to age, i.e., 23 young subjects (20 to 30 years) and 50 elderly subjects (60 to 70 years) submitted to the Wechsler Adult Intelligence Scale-Revised and the free word recall test. The order of word presentation significantly affected the 3rd and 4th words recalled (P < 0.01; F = 14.6). In addition, there was interaction between the presentation order and the type of list presented (P <...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Recall order; Aging; Memory; Presentation order.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2009001000019
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Computational approach of the homeostatic turnover of memory B cells. Repositório Alice
CASTRO, A. de; FRONZA, C. F.; ANSELMO, J..
In this paper, a discrete mathematical model inspired by control mechanisms is used to explore the factors potentially responsible for maximum immunization capacity in mammals. The results have been discussed in light of recent work, and refer to the adoption of parameter values chosen among data gathered from the literature. The model used in this study took into consideration that the immune system is a network of molecules and cells that can recognize itself.
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Células B; Memória imune; Immune memory; Homeostatic turnover; Equilíbrio homeostático; Modelo matemático; Mathematical models; Memory.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/999572
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Consequences of gestational diabetes to the brain and behavior of the offspring Anais da ABC (AABC)
SOUSA,RICARDO A.L. DE; TORRES,YASMIN S.; FIGUEIREDO,CLAUDIA P.; PASSOS,GISELLE F.; CLARKE,JULIA R..
ABSTRACT Gestational diabetes mellitus (GD) is a form of insulin resistance triggered during the second/third trimesters of pregnancy in previously normoglycemic women. It is currently estimated that 10% of all pregnancies in the United States show this condition. For many years, the transient nature of GD has led researchers and physicians to assume that long-term consequences were absent. However, GD diagnosis leads to a six-fold increase in the risk of developing type 2 diabetes (T2D) in women and incidence of obesity and T2D is also higher among their infants. Recent and concerning evidences point to detrimental effects of GD on the behavior and cognition of the offspring, which often persist until adolescence or adulthood. Considering that the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Insulin resistance; Hippocampus; Inflammation; Depression; Learning; Memory; Programing.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502279
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Differential effects of lead and zinc on inhibitory avoidance learning in mice BJMBR
de Oliveira,F.S.; Viana,M.R.; Antoniolli,A.R.; Marchioro,M..
We studied the effects of chronic intoxication with the heavy metals lead (Pb2+) and zinc (Zn2+) on memory formation in mice. Animals were intoxicated through drinking water during the pre- and postnatal periods and then tested in the step-through inhibitory avoidance memory task. Chronic postnatal intoxication with Pb2+ did not change the step-through latency values recorded during the 4 weeks of the test (ANOVA, P>0.05). In contrast, mice intoxicated during the prenatal period showed significantly reduced latency values when compared to the control group (day 1: q = 4.62, P<0.05; day 7: q = 4.42, P<0.05; day 14: q = 5.65, P<0.05; day 21: q = 3.96, P<0.05, and day 28: q = 6.09, P<0.05). Although chronic postnatal intoxication with Zn2+...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Lead; Zinc; Inhibitory avoidance; Memory.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000100014
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Dose-related effects of propericiazine in rats BJMBR
Cechin,E.M.; Quevedo,J.; Barichello,T.; Machado-Vieira,R.; Gentil,V.; Kapczinski,F..
We evaluated the effects of the neuroleptic agent propericiazine on animal models of anxiety and memory. Adult male Wistar rats (250 to 350 g) received intraperitoneal injections of propericiazine (0.05, 0.075 and 0.1 mg/kg), diazepam (1 mg/kg), saline, or diazepam vehicle (20% propylene glycol and 80% saline) 30 min prior to the experimental procedure. Animals (10-15 for each task) were tested for step-down inhibitory avoidance (0.3-mA footshock) and habituation to an open-field for memory assessment, and submitted to the elevated plus-maze to evaluate the effects of propericiazine in a model of anxiety. Animals treated with 0.075 mg/kg propericiazine showed a reduction in anxiety measures (P<0.05) similar to that observed in those treated with...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Propericiazine; Memory; Anxiety; Diazepam; Elevated plus-maze.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000200010
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Effect of inhibitory avoidance training on [3H]-glutamate binding in the hippocampus and parietal cortex of rats BJMBR
Schröder,N.; de-Paris,F.; Roesler,R.; Medina,J.H.; Souza,D.O.; Izquierdo,I..
Glutamate receptors have been implicated in memory formation. The aim of the present study was to determine the effect of inhibitory avoidance training on specific [3H]-glutamate binding to membranes obtained from the hippocampus or parietal cortex of rats. Adult male Wistar rats were trained (0.5-mA footshock) in a step-down inhibitory avoidance task and were sacrificed 0, 5, 15 or 60 min after training. Hippocampus and parietal cortex were dissected and membranes were prepared and incubated with 350 nM [3H]-glutamate (N = 4-6 per group). Inhibitory avoidance training induced a 29% increase in glutamate binding in hippocampal membranes obtained from rats sacrificed at 5 min (P&lt;0.01), but not at 0, 15, or 60 min after training, and did not affect...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Glutamate receptor hippocampus parietal cortex long-term potentiation emotional learning; Memory.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2000000200011
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Effect of repeated restraint stress on memory in different tasks BJMBR
Gamaro,G.D.; Michalowski,M.B.; Catelli,D.H.; Xavier,M.H.; Dalmaz,C..
The present study investigated the effect of repeated stress applied to female rats on memory evaluated by three behavioral tasks: two-way shuttle avoidance, inhibitory avoidance and habituation to an open field. Repeated stress had different effects on rat behavior when different tasks were considered. In the two-way active avoidance test the stressed animals presented memory of the task, but their memory scores were impaired when compared to all other groups. In the habituation to the open field, only the control group showed a significant difference in the number of rearings between training and testing sessions, which is interpreted as an adequate memory of the task. In the handled and chronically stressed animals, on the other hand, no memory was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chronic stress; Memory; Inhibitory avoidance; Two-way active avoidance; Open field.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999000300015
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Effect of the time-of-day of training on explicit memory BJMBR
Barbosa,F.F.; Albuquerque,F.S..
Studies have shown a time-of-day of training effect on long-term explicit memory with a greater effect being shown in the afternoon than in the morning. However, these studies did not control the chronotype variable. Therefore, the purpose of this study was to assess if the time-of-day effect on explicit memory would continue if this variable were controlled, in addition to identifying the occurrence of a possible synchronic effect. A total of 68 undergraduates were classified as morning, intermediate, or afternoon types. The subjects listened to a list of 10 words during the training phase and immediately performed a recognition task, a procedure which they repeated twice. One week later, they underwent an unannounced recognition test. The target list and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Memory; Circadian rhythms; Explicit memory; Recognition memory.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2008000600007
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Effects of caffeine on learning and memory in rats tested in the Morris water maze BJMBR
Angelucci,M.E.M.; Cesário,C.; Hiroi,R.H.; Rosalen,P.L.; Cunha,C. Da.
We studied some of the characteristics of the improving effect of the non-specific adenosine receptor antagonist, caffeine, using an animal model of learning and memory. Groups of 12 adult male Wistar rats receiving caffeine (0.3-30 mg/kg, ip, in 0.1 ml/100 g body weight) administered 30 min before training, immediately after training, or 30 min before the test session were tested in the spatial version of the Morris water maze task. Post-training administration of caffeine improved memory retention at the doses of 0.3-10 mg/kg (the rats swam up to 600 cm less to find the platform in the test session, P<=0.05) but not at the dose of 30 mg/kg. Pre-test caffeine administration also caused a small increase in memory retrieval (the escape path of the rats...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Memory; Learning; Caffeine; Methylxanthines; Adenosine receptor antagonist; Morris water maze.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002001000013
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Effects of entorhinal cortex lesions on memory in different tasks BJMBR
Lesions of the entorhinal cortex produce retrograde memory impairment in both animals and humans. Here we report the effects of bilateral entorhinal cortex lesions caused by the stereotaxic infusion of N-methyl-D-aspartate (NMDA) in rats at two different moments, before or after the training session, on memory of different tasks: two-way shuttle avoidance, inhibitory avoidance and habituation to an open field. Pre- or post-training entorhinal cortex lesions caused an impairment of performance in the shuttle avoidance task, which agrees with the previously described role of this area in the processing of memories acquired in successive sessions. In the inhibitory avoidance task, only the post-training lesions had an effect (amnesia). No effect was observed...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Entorhinal cortex; Memory; NMDA lesions.
Ano: 1997 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997000600011
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Effects of isoflavone on the learning and memory of women in menopause: a double-blind placebo-controlled study BJMBR
Santos-Galduróz,R.F.; Galduróz,J.C.F.; Facco,R.L.; Hachul,H.; Tufik,S..
Hormone decline is common to all women during aging and, associated with other factors, leads to cognitive impairment. Its replacement enhances cognitive performance, but not all women present a clinical and family or personal history that justifies its use, mainly women with a history of cancer. The aim of this study was to determine whether a daily oral dose of 80 mg of isoflavone extract for 4 months can produce benefits in women with low hormone levels, contributing to improvement in cognitive aspects. The sample comprised 50- to 65-year-old women whose menstruation had ceased at least 1 year before and who had not undergone hormone replacement. The volunteers were allocated to two groups of 19 individuals each, i.e., isoflavone and placebo. There was...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Isoflavone; Cognitive disorders; Aging; Information integration; Memory; Menopause.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2010001100016
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Effects of Vitamin K1 Supplementation on the Risk Factors to the Stroke and on Memory in Spontaneously Hypertensive Rats Stroke Prone (SHR-sp) BABT
Cavargere,Victor Agati; Guimarães,Marcela Rodrigues Moreira; Murad,Leonardo Borges; Chaves,Amanda; Vianna,Lucia Marques.
A number of risk factors have been associated to the stroke and many strategies have been proposed in order to control them as well. Vitamin K has been largely found in brain, which suggests a possible function at that tissue. This study aimed to evaluate the potential of this vitamin on the prevention of risk factors to stroke and on cognitive function on SHRSP rats. Twelve SHRSP males, 15 weeks old, were divided into two groups (n= 6 each), receiving the vehicle-coconut oil (control group) or 40 μg of phylloquinone (treated group) during 28 days. Biological parameters, systolic blood pressure and lipid profile were evaluated. Both groups were submitted to the neurological tasks. The data was treated by Student's t test and ANOVA one-way test being...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Phylloquinone; Memory; Stroke; SHRSP.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100313
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Enhancement of declarative memory associated with emotional content in a Brazilian sample BJMBR
Frank,J.E.; Tomaz,C..
Several studies have documented that emotional arousal may enhance long-term memory. This is an adaptation of a paradigm previously used in North American and European samples in investigations of the influence of emotion on long-term retention. A sample of 46 healthy adults of high and low educational levels watched a slide presentation of stories. A randomly assigned group watched a story with an arousing content and another group watched a neutral story. The stories were matched for structure and comprehensibility and the set and order of the 11 slides were the same in both conditions. Immediately after viewing the slide presentation, the participants were asked to rate the emotionality of the narrative. The arousing narrative was rated as being more...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Memory; Emotion; Stories; Brazilian.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2000001200013
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Evaluation of effects of photooxidized Vespa orientalis venom on memory and learning in rats J. Venom. Anim. Toxins incl. Trop. Dis.
Mukund,H; Gawade,SP.
Wasp venom is mixture of complex proteins that have several physical and pharmacological properties. The photochemical detoxification of Vespa orientalis venom is expected to generate photooxidized venom sac extract (PVSE). Antigenically active PVSE is obtained by exposing the venom sac extract (VSE) of Vespa orientalis to ultraviolet radiation in the presence of methylene blue. The aim of the present work was to evaluate the effect of PVSE on learning and memory of rats. Detoxification of PVSE was evident since treated mice had longer survival time than the group of mice treated with VSE. Photooxidized VSE of V. orientalis revealed enhancement on learning and memory by shortening the time to reach food (TRF) in T-maze. In a 28-day study with rats, we...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Vespa venom; Photochemical processes; Learning; Memory; Maze learning.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992011000400009
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H1 but not H2 histamine antagonist receptors mediate anxiety-related behaviors and emotional memory deficit in mice subjected to elevated plus-maze testing BJMBR
Serafim,K.R.; Kishi,M.S.; Canto-de-Souza,A.; Mattioli,R..
This study investigated the role of H1 and H2 receptors in anxiety and the retrieval of emotional memory using a Trial 1/Trial 2 (T1/T2) protocol in an elevated plus-maze (EPM). Tests were performed on 2 consecutive days, designated T1 and T2. Before T1, the mice received intraperitoneal injections of saline (SAL), 20 mg/kg zolantidine (ZOL, an H2receptor antagonist), or 8.0 or 16 mg/kg chlorpheniramine (CPA, an H1 receptor antagonist). After 40 min, they were subjected to the EPM test. In T2 (24 h later), each group was subdivided into two additional groups, and the animals from each group were re-injected with SAL or one of the drugs. In T1, the Student t-test showed no difference between the SAL and ZOL or 8 mg/kg CPA groups with respect to the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chlorpheniramine; Zolantidine; Anxiety; Memory; Elevated plus-maze.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2013000500440
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Hierarchical establishment of information sources during foraging decision-making process involving Acromyrmex subterraneus (Forel, 1893) (Hymenoptera, Formicidae) Rev. Bras. entomol.
Almeida,Nilhian Gonçalves De; Camargo,Roberto Da Silva; Forti,Luis Carlos; Lopes,Juliane Floriano Santos.
ABSTRACT During foraging, worker ants are known for making use of many information sources to guide themselves in external environments, especially individual (memory) and social (trail pheromone) information. Both kinds of information act in a synergic way, keeping the foraging process efficient and organized. However, when social and individual information is conflicting face a trail bifurcation, it is necessary to establish a hierarchical order so prioritizing one of them. This study aims to verify which information (social or individual) is prioritized by Acromyrmex subterraneus workers when facing a bifurcation in a Y-trail system. Only one branch of the Y-trail leads to food resource and it had a section covered by filter paper where trail pheromone...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Leafcutter ants; Trail pheromone; Memory; Synergism.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262018000100036
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Increased training prevents the impairing effect of intra-amygdala infusion of the non-NMDA receptor antagonist CNQX on inhibitory avoidance expression BJMBR
Roesler,R.; Quevedo,J.; Rodrigues,C.; Madruga,M.; Vianna,M.R.M.; Ferreira,M.B.C..
Intra-amygdala infusion of the non-N-methyl-D-aspartate (NMDA) receptor antagonist 6-cyano-7-nitroquinoxaline-2,3-dione (CNQX) prior to testing impairs inhibitory avoidance retention test performance. Increased training attenuates the impairing effects of amygdala lesions and intra-amygdala infusions of CNQX. The objective of the present study was to determine the effects of additional training on the impairing effects of intra-amygdala CNQX on expression of the inhibitory avoidance task. Adult female Wistar rats bilaterally implanted with cannulae into the border between the central and the basolateral nuclei of the amygdala were submitted to a single session or to three training sessions (0.2 mA, 24-h interval between sessions) in a step-down inhibitory...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Amygdala; Non-NMDA receptor; Long-term potentiation; Inhibitory avoidance; Memory; Fear.
Ano: 1999 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1999000300016
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