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| Registros recuperados: 38 | |
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| Manhães de Castro,R.; Barreto Medeiros,J.M.; Mendes da Silva,C.; Ferreira,L.M.P.; Guedes,R.C.A.; Cabral Filho,J.E.; Costa,J.A.. |
| Most studies suggest that serotonin exerts an inhibitory control on the aggression process. According to experimental evidence, this amine also influences growth and development of the nervous tissue including serotoninergic neurons. Thus, the possibility exists that increased serotonin availability in young animals facilitates a long-lasting effect on aggressive responses. The present study aimed to investigate the aggressive behavior of adult rats (90-120 days) treated from the 1st to the 19th postnatal day with citalopram (CIT), a selective serotonin reuptake inhibitor (20 mg/kg, sc, every 3 days). Aggressive behavior was induced by placing a pair of rats (matched by weight) in a box (20 x 20 x 20 cm), and submitting them to a 20-min session of electric... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Aggression; Serotonin; Neonatal treatment; Development. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000100015 |
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| Alves-Neto,W.C.; Guapo,V.G.; Graeff,F.G.; Deakin,J.F.W.; Del-Ben,C.M.. |
| Serotonin has been implicated in the neurobiology of depressive and anxiety disorders, but little is known about its role in the modulation of basic emotional processing. The aim of this study was to determine the effect of the selective serotonin reuptake inhibitor, escitalopram, on the perception of facial emotional expressions. Twelve healthy male volunteers completed two experimental sessions each, in a randomized, balanced order, double-blind design. A single oral dose of escitalopram (10 mg) or placebo was administered 3 h before the task. Participants were presented to a task composed of six basic emotions (anger, disgust, fear, happiness, sadness, and surprise) that were morphed between neutral and each standard emotion in 10% steps. Escitalopram... |
| Tipo: Info:eu-repo/semantics/other |
Palavras-chave: Serotonin; Escitalopram; Facial expression; Emotion; Serotonin reuptake inhibitor. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2010000300010 |
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| Graeff,F.G.. |
| Panic disorder patients are vulnerable to recurrent panic attacks. Two neurochemical hypotheses have been proposed to explain this susceptibility. The first assumes that panic patients have deficient serotonergic inhibition of neurons localized in the dorsal periaqueductal gray matter of the midbrain that organize defensive reactions to cope with proximal threats and of sympathomotor control areas of the rostral ventrolateral medulla that generate most of the neurovegetative symptoms of the panic attack. The second suggests that endogenous opioids buffer normal subjects from the behavioral and physiological manifestations of the panic attack, and their deficit brings about heightened suffocation sensitivity and separation anxiety in panic patients, making... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Panic; Animal model; Periaqueductal gray; Serotonin; Opioids. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2012000400011 |
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| Vasconcelos,S.M.M.; Macêdo,D.S.; Lima,L.O.; Sousa,F.C.F.; Fonteles,M.M.F.; Viana,G.S.B.. |
| We studied the effects of ethanol on the levels of norepinephrine, dopamine, serotonin (5-HT) and their metabolites as well as on D1- and D2-like receptors in the rat striatum. Ethanol (2 or 4 g/kg, po) was administered daily by gavage to male Wistar rats and on the 7th day, 30 min or 48 h after drug administration, the striatum was dissected for biochemical assays. Monoamine and metabolite concentrations were measured by HPLC and D1- and D2-like receptor densities were determined by binding assays. Scatchard analyses showed decreases of 30 and 43%, respectively, in D1- and D2-like receptor densities and no change in dissociation constants (Kd) 48 h after the withdrawal of the dose of 4 g/kg. Ethanol, 2 g/kg, was effective only on the density of D2-like... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Rat striatum; Dopamine; Serotonin; Alcohol ingestion; Noradrenaline; D1 and D2 receptor density; Kd. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000400013 |
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| Tiradentes,R.V.; Pires,J.G.P.; Silva,N.F.; Ramage,A.G.; Santuzzi,C.H.; Futuro Neto,H.A.. |
| Serotonergic mechanisms have an important function in the central control of circulation. Here, the acute effects of three selective serotonin (5-HT) reuptake inhibitors (SSRIs) on autonomic and cardiorespiratory variables were measured in rats. Although SSRIs require 2-3 weeks to achieve their full antidepressant effects, it has been shown that they cause an immediate inhibition of 5-HT reuptake. Seventy male Wistar rats were anesthetized with urethane and instrumented to record blood pressure, heart rate, renal sympathetic nerve activity (RSNA), and respiratory frequency. At lower doses, the acute cardiovascular effects of fluoxetine, paroxetine and sertraline administered intravenously were insignificant and variable. At middle and higher doses, a... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fluoxetine; Paroxetine; Renal nerve activity; Serotonin; Sertraline; Sympathetic activity. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2014000700554 |
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| Wang,C.; Zhang,N.; Zhang,Y.L.; Zhang,J.; Yang,H.; Timothy,T.C.. |
| The aim of this study was to compare the effectiveness of attribution retraining group therapy (ARGT) with selective serotonin reuptake inhibitors (SSRIs) in the treatment of major depressive disorder (MDD), generalized anxiety disorder (GAD), and obsessive-compulsive disorder (OCD). Subjects were sequentially recruited and randomized into two groups, one receiving ARGT (n = 63) and the other SSRIs (n = 66) for 8 weeks. Fifty-four ARGT outpatients with MDD (n = 19), GAD (n = 19), and OCD (n = 16) and 55 SSRI outpatients with MDD (n = 19), GAD (n = 19), and OCD (n = 17) completed the study. All subjects were assessed using the Hamilton Depression Scale and Hamilton Anxiety Scale before and after treatment. The 10-item Yale-Brown Obsessive Compulsive Scale... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Attribution retraining group therapy; Selective serotonin reuptake inhibitors; Neurobiological effects; Serotonin; Cortisol. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2013000300318 |
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| Dai,S.Q.; Yu,L.P.; Shi,X.; Wu,H.; Shao,P.; Yin,G.Y.; Wei,Y.Z.. |
| The monoamine serotonin (5-hydroxytryptamine, 5-HT), a well-known neurotransmitter, also has important functions outside the central nervous system. The objective of this study was to investigate the role of 5-HT in the proliferation, differentiation, and function of osteoblasts in vitro. We treated rat primary calvarial osteoblasts with various concentrations of 5-HT (1 nM to 10 µM) and assessed the rate of osteoblast proliferation, expression levels of osteoblast-specific proteins and genes, and the ability to form mineralized nodules. Next, we detected which 5-HT receptor subtypes were expressed in rat osteoblasts at different stages of osteoblast differentiation. We found that 5-HT could inhibit osteoblast proliferation, differentiation, and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Serotonin; Osteoblast; Proliferation; Differentiation; 5-HT receptors; 5-HT. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2014000900759 |
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| Lopes,L.S.; Marques,R.B.; Pereira,S.S.; Ayres,M.C.C.; Chaves,M.H.; Cavalheiro,A.J.; Vieira Júnior,G.M.; Almeida,F.R.C.. |
| Previous studies on Combretum leprosum, a tree growing in the Northeastern states of Brazil, have shown antinociceptive effects of the ethanol extract of its leaves and bark, but studies examining its constituents are rare. The objective of this study was to evaluate the antinociceptive effect of the hydroalcoholic fraction (HF) of one of its constituents, the flavonoid (-) epicatechin (EPI), administered orally to mice (20-30 g) in models of chemical nociception, and the possible mechanisms involved. Different doses of HF (62.5 to 500 mg/kg) and EPI (12.5 to 50 mg/kg) were evaluated in models of abdominal writhing, glutamate, capsaicin, and formalin in animals pretreated with different antagonists: naloxone, ondansetron, yohimbine, ketanserin, pindolol,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Combretum leprosum; Epicatechin; Antinociceptive; Serotonin; Nitric oxide. |
| Ano: 2010 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2010001200008 |
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| Gonzalez,L.E.; Parada,M.A.; Tucci,S.; Teneud,L.; Overstreet,D.H.; Hernandez,L.. |
| Breeding for high and low hypothermic responses to systemic administration of a serotonin1A (5-HT1A) receptor agonist (8-hydroxy-2-(di-n-propylamino)tetralin, 8-OH-DPAT) has resulted in high DPAT-sensitive (HDS) and low DPAT-sensitive (LDS) lines of rats, respectively. These lines also differ in several behavioral measures associated with stress. In the present microdialysis study we observed that basal 5-HT concentrations in the prefrontal cortex and dorsal hippocampus did not differ significantly between HDS and LDS rats. Thus, behavioral differences between the HDS and LDS lines might not be attributed to differences in basal 5-HT release. However, both lines had lower basal levels of 5-HT release than their randomly bred control group (random... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brain microdialysis; Serotonin; 5-HT1A rat lines; Fenfluramine; 8-OH-DPAT. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000200014 |
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| Deiró,T.C.B.J.; Manhães-de-Castro,R.; Cabral-Filho,J.E.; Souza,S.L.; Freitas-Silva,S.R.; Ferreira,L.M.P.; Guedes,R.C.A.; Câmara,C.R.V.; Barros,K.M.F.T.. |
| We investigated the somatic maturation of neonate rats treated during the suckling period with citalopram, a selective serotonin reuptake inhibitor. Groups with 6 male neonates were randomly assigned to different treatments 24 h after birth. Each litter was suckled by one of the dams until the 21st postnatal day. Body weight, head axis and tail length were measured daily from the 1st to the 21st postnatal day. Time of ear unfolding, auditory conduit opening, incisor eruption, and eye opening was determined. Pups received 5 mg (Cit5), 10 mg (Cit10) or 20 mg/kg (Cit20) citalopram sc, or saline (0.9% NaCl, w/v, sc). Compared to saline, body weight was lower (24.04%, P < 0.01) for Cit10 from the 10th to the 21st day and for Cit20 from the 6th to the 21st... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Serotonin; Growth indicators; Selective serotonin reuptake inhibitor; Citalopram; Craniofacial; Skull. |
| Ano: 2004 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2004001000009 |
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| Jobim,P.F.C.; Prado-Lima,P.A.S.; Schwanke,C.H.A.; Giugliani,R.; Cruz,I.B.M.. |
| Epidemiological investigations suggest that T102C polymorphism of gene 5-HT2A may be associated with mean life span because diseases and behaviors related to this polymorphism, such as schizophrenia, suicide, aggression, and addiction, may potentially shorten mean life span. A sample of 687 individuals without previous neuropsychiatric disease was genotyped and separated into 3 groups according to their gender and age: 14-45 years old, 46-64 years old and 65-100 years old. Molecular genotyping was performed using the technique of polymerase chain reaction followed by restriction fragment length polymorphism using HpaII restriction enzyme. 5-HT2A genotype frequencies were: TT = 21.5% (148), CC = 16.6% (114) and TC = 61.9% (425) and allele frequencies were T... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Mean life span; Serotonin; Receptor 2A; T102C polymorphism. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2008001100012 |
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| Andreatini,R.; Blanchard,C.; Blanchard,R.; Brandão,M.L.; Carobrez,A.P.; Griebel,G.; Guimarães,F.S.; Handley,S.L.; Jenck,F.; Leite,J.R.; Rodgers,J.; Schenberg,L.C.; Da Cunha,C.; Graeff,F.G.. |
| This article is a transcription of an electronic symposium sponsored by the Brazilian Society of Neuroscience and Behavior (SBNeC). Invited researchers from the European Union, North America and Brazil discussed two issues on anxiety, namely whether panic is a very intense anxiety or something else, and what aspects of clinical anxiety are reproduced by animal models. Concerning the first issue, most participants agreed that generalized anxiety and panic disorder are different on the basis of clinical manifestations, drug response and animal models. Also, underlying brain structures, neurotransmitter modulation and hormonal changes seem to involve important differences. It is also common knowledge that existing animal models generate different types of... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Panic; Anxiety; Fear; Anxiolytics; 5-HT; Benzodiazepines; Serotonin; Amygdala; Periaqueductal gray matter; Animal models. |
| Ano: 2001 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000200001 |
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| Registros recuperados: 38 | |
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