Abstract:
:The inferior colliculus is involved in conveying auditory information of an aversive nature to higher cortical structures. Gradual increases in the electrical stimulation of this structure produce progressive aversive responses from vigilance, through freezing, until escape. Recently, we have shown that microinjections of NMDA into the inferior colliculus mimic these aversive effects and that the neural substrates responsible for learned escape behavior in the inferior colliculus are regulated by GABA-benzodiazepine mechanisms. In the present study, we extend these observations showing that unlearned aversive responses are also depressed by muscimol and midazolam, both GABA-benzodiazepine agonists, and that microinjection of glutamate, an excitatory amino acid, into the inferior colliculus can trigger freezing responses. Electrical stimulation of the inferior colliculus of rats placed inside an open field allowed the determination of thresholds for the aversive responses, alertness, freezing and escape. Systemic administration (3 and 5.6 mg/kg) as well as microinjections into the inferior colliculus of the anxiolytic compound midazolam (10, 20 and 40 nmol) caused increases in threshold for these aversive responses. Similar results were obtained following microinjections of the GABA-A agonist muscimol (0.1, 1 and 5 nmol) into this brainstem structure. Microinjections of low doses of glutamate (5 nmol), presumed to activate mainly AMPA/kainate receptors, into the ventrolateral division of the central nucleus of the inferior colliculus of rats placed inside a circular arena induced aversive reactions, characterized by freezing responses. However, higher doses of glutamate caused no apparent effects. GDEE, an AMPA/kainate receptor antagonist, inhibited, whereas AP7, a NMDA receptor antagonist, did not influence these responses. It is suggested that GABA-benzodiazepine processes modulate the expression of defensive reactions in the inferior colliculus and that activation of fast-acting excitatory amino acid receptors in this midbrain region can trigger the initial steps of the defense reaction without eliciting the motor explosive behavior usually seen following the activation of NMDA receptors.
journal_name
Psychopharmacology (Berl)journal_title
Psychopharmacologyauthors
Pandossio JE,Brandão MLdoi
10.1007/s002130050900subject
Has Abstractpub_date
1999-03-01 00:00:00pages
360-8issue
4eissn
0033-3158issn
1432-2072journal_volume
142pub_type
杂志文章abstract::A venous blood sample and an umbilical cord blood sample were obtained from five young women treated with the neuroleptic drug, cis(Z)-flupentixol decanoate in Viscoleo (intramuscularly) or flupentixol (orally) at the time of giving birth. In two cases amniotic fluid was also obtained, and from three of the mothers mi...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/BF00433814
更新日期:1980-01-01 00:00:00
abstract:RATIONALE:Training in research ethics is crucial for psychiatric investigators. Addressing ethical dimensions of human subjects research requires knowledge about the rules and norms governing research; sensitivity to ethical implications of actions; and skills in ethics problem solving. Investigators in training who ar...
journal_title:Psychopharmacology
pub_type: 杂志文章,评审
doi:10.1007/s00213-003-1500-4
更新日期:2003-12-01 00:00:00
abstract:OBJECTIVES:Ayahuasca is a traditional South American psychoactive beverage and the central sacrament of Brazilian-based religious groups, with followers in Europe and the United States. The tea contains the psychedelic indole N,N-dimethyltryptamine (DMT) and beta-carboline alkaloids with monoamine oxidase-inhibiting pr...
journal_title:Psychopharmacology
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00213-007-0963-0
更新日期:2008-02-01 00:00:00
abstract::In mice that were scored for the length of time they remained immobile in awkward postures (cataleptic) on an inclined wire grid, a large IP dose of pilocarpine (80 mg/kg) caused a clear catalepsy, which was prevented by both dopamine agonists that were tested, apomorphine (4 or 8 mg/kg, IP) and bromocriptine (8 mg/kg...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/BF00431769
更新日期:1985-01-01 00:00:00
abstract::Naloxone HCl (10 micrograms/0.5 ml) was injected in the locus coeruleus (LC) of morphine-dependent rats and the behavioural manifestations of morphine withdrawal and the cortical levels of 3-methoxy-4-hydroxyphenylethyleneglycol sulfate (MHPG-SO4) were measured 30 min later. Naloxone precipitated a withdrawal syndrome...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/BF00187263
更新日期:1987-01-01 00:00:00
abstract:BACKGROUND AND RATIONALE:Pain is a complex sensory experience, involving cognitive factors, environment (setting, society, and culture), experience, and gender and is modulated significantly by the central nervous system (CNS). The mechanisms by which opioid analgesics work are understood, but this class of drugs is no...
journal_title:Psychopharmacology
pub_type: 杂志文章,评审
doi:10.1007/s00213-010-1819-6
更新日期:2010-06-01 00:00:00
abstract:RATIONALE:Relapse to smoking is often precipitated by stress, yet little is known about the effects of nicotine withdrawal on responses to acute stress, or whether nicotine replacement reverses withdrawal-induced changes in stress response. OBJECTIVES:The aim of the present study is to use an effective social stressor...
journal_title:Psychopharmacology
pub_type: 杂志文章,随机对照试验
doi:10.1007/s00213-010-2150-y
更新日期:2011-11-01 00:00:00
abstract:AIM:It is widely assumed that the upcoming therapeutics for Alzheimer's disease will require to act on more than one target to be effective. We investigated here whether a combination of the nicotinic receptor allosteric modulator/cholinesterase inhibitor galantamine can act synergistically with the type 4 serotonin re...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/s00213-017-4664-z
更新日期:2017-08-01 00:00:00
abstract:RATIONALE:Elevated whole-blood serotonin (5-HT) is a robust biomarker in ~ 30% of patients with autism spectrum disorders, in which repetitive behavior is a core symptom. Furthermore, elevated whole-blood 5-HT has also been described in patients with pediatric obsessive-compulsive disorder. The 5-HT1B receptor is assoc...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/s00213-020-05758-8
更新日期:2021-01-29 00:00:00
abstract:RATIONALE:Cannabinoid CB1 receptors are expressed in the prefrontal cortex, but their role in mediating executive functions such as behavioral flexibility is unclear. OBJECTIVE:The present study examined the effect of pharmacological activation or blockade of the cannabinoid CB1 receptors on behavioral flexibility usi...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/s00213-006-0421-4
更新日期:2006-08-01 00:00:00
abstract:RATIONALE:Clozapine is a unique antipsychotic with very low propensity to cause motor side effects. In contrast to most other antipsychotics that block more than 70% of dopamine D(2) receptors at therapeutic doses, clozapine occupies less than 70%. Furthermore, even at maximum occupancy, 70% is not exceeded. Several me...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/s00213-001-0967-0
更新日期:2002-02-01 00:00:00
abstract:RATIONALE:Early life exposure to stress and to GABAA receptor modulators have well-defined and persistent behavioral effects. A single neonatal injection of the GABAergic neurosteroid allopregnanolone (3alpha-hydroxy,5alpha-pregnane-20-one, 10 mg/kg, i.p.) alters the localization of prefrontal cortex (PFC) interneurons...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/s00213-006-0360-0
更新日期:2006-06-01 00:00:00
abstract:RATIONALE:We test methods to advance (shift earlier) circadian rhythms without producing misalignment between rhythms and sleep. We previously tested (1) a gradually advancing sleep/dark schedule plus morning bright light and afternoon/evening melatonin and (2) the same sleep schedule with only morning bright light. No...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/s00213-012-2869-8
更新日期:2013-02-01 00:00:00
abstract:INTRODUCTION:The majority of individuals who suffer an episode of depression go on to experience recurrences. We have proposed, based upon the observation that reducing serotonin via acute tryptophan depletion (ATD) is more likely to induce negative mood in recovered depressed individuals than never depressed individua...
journal_title:Psychopharmacology
pub_type: 临床试验,杂志文章
doi:10.1007/s00213-009-1533-4
更新日期:2009-08-01 00:00:00
abstract::Naloxone, an opioid receptor antagonist, attenuates a wide range of behavioral effects of d-amphetamine, such as the stimulation of motor activity. To investigate the pharmacological selectivity of the naloxone/amphetamine interaction, we assessed the effects of naloxone (5.0 mg/kg SC) upon motor activity induced in r...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/BF02244839
更新日期:1994-03-01 00:00:00
abstract::Rhesus monkeys were trained in a discrete-trials choice procedure and allowed to choose between intravenous injections of cocaine (0.01-1.0 mg/kg/injection) and food presentation (1 or 4 pellets; 1 g/pellet) during daily 7-h experimental sessions. When each reinforcer was available under a fixed-ratio (FR) 30 schedule...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/BF02245115
更新日期:1992-01-01 00:00:00
abstract:RATIONALE:Caffeine and the adenosine A(1) and A(2A) receptor antagonist CGS15943 produce many behavioral effects that are similar to those produced by classic stimulant drugs (e.g. cocaine and amphetamines). OBJECTIVES:The current study evaluated whether CGS15943 would maintain self-administration and reinstate exting...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/s00213-003-1410-5
更新日期:2003-07-01 00:00:00
abstract:RATIONALE:Synthetic psychostimulant abuse, including cathinone-derived 3,4-methylenedioxypyrovalerone (MDPV), continues to increase in many countries. Similar to cocaine but with greater potency, MDPV elicits a transient sympathomimetic response by blocking cellular uptake of dopamine (DA) and norepinephrine (NE)-admin...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/s00213-017-4709-3
更新日期:2017-11-01 00:00:00
abstract::Intraperitoneal (IP) administration of the acetylcholinesterase inhibitor, soman (10-40 micrograms/kg), suppressed in a dose-related manner response rates in rats maintained under a multiple fixed-interval 50-s fixed-ratio 25 schedule of food delivery. Chronic administration of soman at weekly intervals resulted in to...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/BF00427899
更新日期:1985-01-01 00:00:00
abstract::This experiment examined the effect of destruction of the ascending 5-hydroxytryptaminergic (5HTergic) pathways on performance in a free-operant timing schedule. Rats received either injections of 5,7-dihydroxytryptamine into the dorsal and median raphe nuclei or sham lesions. They were trained to press levers for a s...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/s002130050096
更新日期:1996-10-01 00:00:00
abstract::Lymphocyte beta adrenergic receptor binding using [125I]CNP was determined in patients with panic disorder (N = 4) or agoraphobia with panic attacks (N = 17) and age- and sex-matched healthy subjects (N = 22). The patients showed a significantly lower number of beta-adrenergic receptor binding sites and a significantl...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/BF00735875
更新日期:1988-01-01 00:00:00
abstract::We have previously obtained evidence that the mesoamygdaloid dopamine projection modulates the acquisition of a conditioned response (CR) elicited by presentation of a conditioned stimulus (CS) predicting the availability of a natural (sucrose) reward. This property was found to be dependent upon D3, but not D1 or D2,...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/s002130050771
更新日期:1998-12-01 00:00:00
abstract:RATIONALE:N-methyl-D-aspartate (NMDA) receptors play crucial roles in learning and memory, but the role of each NMDA receptor subtype in a specific cognitive process is unclear. Non-selective blockers of NMDA receptor are used to model the cognitive impairment in schizophrenia and Alzheimer's disease. Counter-intuitive...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/s00213-015-4008-9
更新日期:2015-11-01 00:00:00
abstract::Serotonergic mechanisms have been implicated in the pathophysiology of depression and in the neuropharmacology of antidepressant treatment. One measure of central serotonergic function is the prolactin (PRL) response to IV L-tryptophan (L-TRP). We used the L-TRP test to assess the role of serotonin in the mechanism of...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/BF02245291
更新日期:1992-01-01 00:00:00
abstract:RATIONALE:Only a small percentage of individuals seeking treatment for their marijuana use achieves sustained abstinence, suggesting more treatment options are needed. OBJECTIVES:We investigated the effects of baclofen (study 1) and mirtazapine (study 2) in a human laboratory model of marijuana intoxication, withdrawa...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/s00213-010-1888-6
更新日期:2010-08-01 00:00:00
abstract:RATIONALE:Animal models of relapse to drug abuse typically assess the ability of various manipulations to reinstate responding that has ceased due to non-reinforcement (extinction). However, there is a lack of information concerning the reinstatement of responding that has ceased for reasons other than extinction. OBJ...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/s00213-002-1193-0
更新日期:2003-07-01 00:00:00
abstract:RATIONALE:Recent studies have suggested that the salutary actions of clozapine in schizophrenia may be due to selective activation of M(1) muscarinic receptors by clozapine and/or its major active metabolite N-desmethylclozapine. OBJECTIVE:We systematically tested this hypothesis by screening a large number of psychoa...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/s00213-004-2017-1
更新日期:2005-04-01 00:00:00
abstract::Sibutramine hydrochloride, a novel monoamine reuptake inhibitor antidepressant, has been studied to determine whether it alters dopaminergic function in the brain. Its effects have been compared with bupropion, a dopamine reuptake inhibitor, and methamphetamine, a dopamine reuptake inhibitor and releasing agent. Sibut...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/BF02245152
更新日期:1992-01-01 00:00:00
abstract:RATIONALE:Therapeutic efficacy of antidepressant drugs appears to be related to their ability in producing neuroadaptive changes that restore normal brain function. Activity-regulated cytoskeletal associated protein (Arc) is an effector immediate early gene that plays a fundamental role in activity-dependent neural pla...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/s00213-008-1276-7
更新日期:2008-12-01 00:00:00
abstract::The novel dopamine autoreceptor antagonists (-)-DS 121 and (+)-UH 232 were tested for their ability to alter cocaine self-administration behavior in rats reinforced on a progressive ratio (PR) schedule. (-)-DS 121 (15 mg/kg) and (+)-UH 232 (30 mg/kg) produced significant decreases in breaking point. (-)-DS 121 produce...
journal_title:Psychopharmacology
pub_type: 杂志文章
doi:10.1007/BF02246149
更新日期:1995-07-01 00:00:00