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Registros recuperados: 8
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A link between the hippocampal and the striatal memory systems of the brain Anais da ABC (AABC)
Rossato,Janine I.; Zinn,Carolina G.; Furini,Cristiane; Bevilaqua,Lia R.M.; Medina,Jorge H.; Cammarota,Martín; Izquierdo,Iván.
Two major memory systems have been recognized over the years (Squire 1987): the declarative memory system, which is under the control of the hippocampus and related temporal lobe structures, and the procedural or habit memory system, which is under the control of the striatum and its connections. Most if not all learning tasks studied in animals, however, involve either the performance or the suppression of movement; this, if learned well, may be viewed as having become a habit. It is agreed that memory rules change from their first association to those that take place when the task is mastered. Does this change of rules involve a switch from one memory system to another? Here we will comment on: 1) reversal learning in the Morris water maze (MWM), in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hippocampus; Striatum; Declarative memory; Procedural memory; Habits; Learning.
Ano: 2006 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652006000300011
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Comparative effects of organic and inorganic mercury on in vivo dopamine release in freely moving rats BJMBR
Faro,L.R.F.; Rodrigues,K.J.A.; Santana,M.B.; Vidal,L.; Alfonso,M.; Durán,R..
The present study was carried out in order to compare the effects of administration of organic (methylmercury, MeHg) and inorganic (mercury chloride, HgCl 2 ) forms of mercury on in vivo dopamine (DA) release from rat striatum. Experiments were performed in conscious and freely moving female adult Sprague-Dawley (230-280 g) rats using brain microdialysis coupled to HPLC with electrochemical detection. Perfusion of different concentrations of MeHg or HgCl 2 (2 µL/min for 1 h, N = 5-7/group) into the striatum produced significant increases in the levels of DA. Infusion of 40 µM, 400 µM, or 4 mM MeHg increased DA levels to 907 ± 31, 2324 ± 156, and 9032 ± 70% of basal levels, respectively. The same concentrations of HgCl 2 increased DA levels to 1240 ± 66,...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Methylmercury; Mercury chloride; Dopamine release in vivo; Microdialysis; Mercury determination; Striatum.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2007001000009
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Effects of chronic ethanol treatment on monoamine levels in rat hippocampus and striatum BJMBR
Vasconcelos,S.M.M.; Cavalcante,R.A.; Aguiar,L.M.V.; Sousa,F.C.F.; Fonteles,M.M.F.; Viana,G.S.B..
We studied the effects of ethanol on concentrations of noradrenaline (NE), dopamine (DA) and serotonin (5-HT) and their metabolites in rat hippocampus and striatum. Ethanol (2 or 4 g/kg, po, from a 20% aqueous solution) was administered daily to male Wistar rats (4-13 per group) for 30 days and animals were sacrificed 30 min or 48 h after the last administration. Monoamines were measured by HPLC and considered significant at P < 0.05. A 47% increase in 5-HT levels was observed in the hippocampus with 4 g/kg ethanol in the 30-min protocol. Ethanol (2 and 4 g/kg) decreased DA (2114.5 ± 126.4 and 1785.1 ± 234.2 ng/g wet tissue, respectively) and 3,4-dihydroxyphenylacetic acid (DOPAC, 1477.6 ± 132.1 and 1218.8 ± 271.7 ng/g wet tissue, respectively) levels,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hippocampus; Striatum; Ethanol; Noradrenaline; Dopamine; Serotonin.
Ano: 2004 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004001200009
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Increased coherence among striatal regions in the theta range during attentive wakefulness BJMBR
Lepski,G.; Arévalo,A.; Valle,A.C. do; Ballester,G.; Gharabaghi,A..
The striatum, the largest component of the basal ganglia, is usually subdivided into associative, motor and limbic components. However, the electrophysiological interactions between these three subsystems during behavior remain largely unknown. We hypothesized that the striatum might be particularly active during exploratory behavior, which is presumably associated with increased attention. We investigated the modulation of local field potentials (LFPs) in the striatum during attentive wakefulness in freely moving rats. To this end, we implanted microelectrodes into different parts of the striatum of Wistar rats, as well as into the motor, associative and limbic cortices. We then used electromyograms to identify motor activity and analyzed the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Attention; Behavior; Striatum; Theta rhythm; Partial directed coherence.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2012000800011
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Modulation of post-coital dopaminergic tone by prior parity BABT
Sider,Lucia Helena; Hucke,Erica Engelberg Teixeira da Silva; Felicio,Luciano Freitas.
The aim of this study was to investigate the possible effects of reproductive experience on dopaminergic profile in three different brain tissues, hypothalamus, striatum and cortex in rats on 7th-8th day of pregnancy during the light-dark shift (between 1700-1900h). Results showed that in hypothalamus, dopamine levels increased and DOPAC/DA decreased as a function of parity. In cortex, no differences were observed. In striata, the haloperidol-induced HVA and HVA/DA increases were less intense in experienced animals. These findings suggested that reproductive experience produced functional central changes during pregnancy, with different neurochemical responses depending on the brain region.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hypothalamus; Striatum; Cortex; Haloperidol; HVA; DOPAC.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132010000300015
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Physical exercise prevents motor disorders and striatal oxidative imbalance after cerebral ischemia-reperfusion BJMBR
Sosa,P.M.; Schimidt,H.L.; Altermann,C.; Vieira,A.S.; Cibin,F.W.S.; Carpes,F.P.; Mello-Carpes,P.B..
Stroke is the third most common cause of death worldwide, and most stroke survivors present some functional impairment. We assessed the striatal oxidative balance and motor alterations resulting from stroke in a rat model to investigate the neuroprotective role of physical exercise. Forty male Wistar rats were assigned to 4 groups: a) control, b) ischemia, c) physical exercise, and d) physical exercise and ischemia. Physical exercise was conducted using a treadmill for 8 weeks. Ischemia-reperfusion surgery involved transient bilateral occlusion of the common carotid arteries for 30 min. Neuromotor performance (open-field and rotarod performance tests) and pain sensitivity were evaluated beginning at 24 h after the surgery. Rats were euthanized and the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Stroke; Striatum; Locomotion; Oxidative stress; Antioxidants; Running.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2015000900798
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Selective destruction of nigrostriatal dopaminergic neurons does not alter [3H]-ryanodine binding in rat striatum BJMBR
Noël,F.; Geurts,M.; Maloteaux,J.-M..
Dopamine nigrostriatal neurons are important for motor control and may contain a particularly dense population of ryanodine receptors involved in the control of dopamine release. To test this hypothesis, we used a classical model of unilateral selective lesion of these neurons in rats based on 6-hydroxydopamine (6-OHDA) injection into the substantia nigra. Binding of [3H]-GBR 12935, used as a presynaptic marker since it labels specifically the dopamine uptake complex, was dramatically decreased by 83-100% in striatum homogenates after 6-OHDA lesion. On the contrary, no reduction of [3H]-ryanodine binding was observed. The present data indicate that [3H]-ryanodine binding sites present in rat striatum are not preferentially localized in dopaminergic...
Tipo: Info:eu-repo/semantics/other Palavras-chave: Ryanodine; Striatum; 6-hydroxydopamine; Dopamine neurons; Neuroleptic malignant syndrome.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2000000200013
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The modified 2VO ischemia protocol causes cognitive impairment similar to that induced by the standard method, but with a better survival rate BJMBR
Cechetti,F.; Worm,P.V.; Pereira,L.O.; Siqueira,I.R.; A. Netto,C..
Permanent bilateral occlusion of the common carotid arteries (2VO) in the rat has been established as a valid experimental model to investigate the effects of chronic cerebral hypoperfusion on cognitive function and neurodegenerative processes. Our aim was to compare the cognitive and morphological outcomes following the standard 2VO procedure, in which there is concomitant artery ligation, with those of a modified protocol, with a 1-week interval between artery occlusions to avoid an abrupt reduction of cerebral blood flow, as assessed by animal performance in the water maze and damage extension to the hippocampus and striatum. Male Wistar rats (N = 47) aged 3 months were subjected to chronic hypoperfusion by permanent bilateral ligation of the common...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Chronic cerebral hypoperfusion; Spatial memory; Hippocampus; Striatum; Water maze.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2010001200007
Registros recuperados: 8
Primeira ... 1 ... Última
 

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