Abstract:
:In previous studies, chronic low-dose methylphenidate (MPH) administration during early development has been shown to increase emotional responding in adulthood. However, most studies employed male subjects, which generally show enhanced fear relative to females in laboratory tests of anxious behaviors. The present study examined the sex-dependent effects of MPH treatment on innate and learned fear behaviors. Rats were treated for 4 weeks from periadolescence through early adulthood with oral MPH. In open field testing, females showed greater levels of activity than males, and MPH (5mg/kg) decreased locomotion relative to control and 2mg/kg treatment in both sexes. In contextual fear conditioning, females exhibited less freezing than males at all retention intervals. Both sexes treated with 5mg/kg MPH showed increased fear to the shock context, although MPH treatment did not interfere with contextual discrimination in either sex. Upon reexposure to the shock context at 24h, only females treated with 5mg/kg MPH exhibited increases in freezing. MPH treatment did not disrupt extinction of contextual fear (48 h post-conditioning) in either sex. These findings illustrate subtle sex differences in the effects of prolonged MPH exposure on fear behaviors, and highlight the need to examine further the underlying mechanisms in both sexes.
journal_name
Neurosci Lettjournal_title
Neuroscience lettersauthors
Bethancourt JA,Vásquez CE,Britton GBdoi
10.1016/j.neulet.2011.03.080subject
Has Abstractpub_date
2011-05-27 00:00:00pages
30-4issue
1eissn
0304-3940issn
1872-7972pii
S0304-3940(11)00394-6journal_volume
496pub_type
杂志文章abstract::The normal development of the superior collicular map of auditory space in the guinea pig requires visual experience (Eur. J. Neurosci., 2 (1990) 682-692). The possible role of the visual cortex in this process was assessed by unilateral removal of the cortex prior to the crucial period during which visual experience ...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/0304-3940(91)90030-w
更新日期:1991-04-29 00:00:00
abstract::The role of nitric oxide (NO) in N-methyl-D-aspartate (NMDA)-regulated release of 5-hydroxytryptamine (5-HT) in the frontal cortex and raphe nuclei of freely moving rats has been studied using microdialysis with dual probes, one in each region of the same animal. In order to do this the selective neuronal nitric oxide...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/s0304-3940(00)01378-1
更新日期:2000-09-08 00:00:00
abstract::Alzheimer's disease (AD) is still difficult to be precisely diagnosed in its early stage to date. Establishing of reliable and manageable disease-specific biological markers is required to improve diagnostic accuracy. Based on the hypothesis of cell cycle regulatory failure at the early stage of AD, we tested whether ...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/j.neulet.2012.03.093
更新日期:2012-05-16 00:00:00
abstract::An increase in diaphragmatic electromyogram (EMG) recorded via oesophageal electrodes during positive pressure breathing has been reported to indicate an increase in the neural outflow to the muscle. However, using similar techniques, the size of compound muscle action potentials produced by supramaximal phrenic nerve...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/0304-3940(86)90442-8
更新日期:1986-09-25 00:00:00
abstract::The present work describes the formation of a transient efferent axonal projection from the isthmo-optic nucleus (ION) to the ipsilateral optic tectum of the chick embryo. Local application of either the carbocyanine dye DiI or rhodamine-B-isothiocyanate (RITC) to the superficial layers of the optic tectum resulted in...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/0304-3940(90)90591-v
更新日期:1990-06-08 00:00:00
abstract::The effect of carbachol on the excitatory synaptic transmission was studied in rat neostriatal neurons using intracellular and whole-cell voltage clamp-recording methods. Depolarizing excitatory postsynaptic potentials (EPSPs) were evoked by cortical stimulation. Superfusion of carbachol (0.01-3 microM) reversibly dec...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/0304-3940(95)11915-j
更新日期:1995-09-08 00:00:00
abstract::Substance P caused a depolarization of cultured spinal neurones which was often accompanied by a decrease in membrane conductance. The peptide usually had no effect on the membrane potential and resistance of glial cells. In contrast to the depolarization by glutamate, which is associated with an influx of Na+ and an ...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/0304-3940(81)90242-1
更新日期:1981-07-02 00:00:00
abstract::Aβ-mediated oxidative stress damage is considered a direct cause of Alzheimer's disease (AD). Therefore, drugs that have been developed to block oxidative stress are considered effective for AD treatment. Isosilybin is a flavonoid compound extracted from Silybum marianum, and it has been confirmed to have many pharmac...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/j.neulet.2016.08.043
更新日期:2016-10-06 00:00:00
abstract::The N-methyl-D-aspartate (NMDA) receptor blocker 2-amino-5-phosphonovaleric acid [+/-)-2-APV) and kynurenic acid both suppressed spontaneous epileptiform burst discharges in the CA3 region of rat hippocampal slices. When the bursts were induced by perfusion with magnesium-free medium (+/-)-2-APV was the more potent in...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/0304-3940(88)90414-4
更新日期:1988-01-22 00:00:00
abstract::The cells of origin of the brainstem projection to the caudate-putamen (CP) were examined in the albino rat by the use of two fluorescent retrograde tracers. Nuclear yellow was injected into the CP of one hemisphere and granular blue was injected into the contralateral CP. Retrogradely labeled cells were studied in th...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/0304-3940(82)90221-x
更新日期:1982-09-20 00:00:00
abstract::The dopaminergic system has been proposed to be one of the innervations in controlling the mammalian pineal gland function. The dopamine receptors have been characterized in the pineal and the biphasic effects of dopamine on melatonin production have been demonstrated. Recently, the site of dopamine transporter (DAT),...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/j.neulet.2006.04.066
更新日期:2006-07-31 00:00:00
abstract::We studied the extracellular concentration of glutamate and taurine in the frontal cortex of freely-moving pentylenetetrazole (PTZ) kindled rats using an in vivo microdialysis. A significant and sustained increase in the glutamate level was observed in the kindled rats, in contrast, a slight and delayed increase was o...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/s0304-3940(00)00838-7
更新日期:2000-03-17 00:00:00
abstract::Nitric oxide (NO) mediates cell-cell signalling in the brain and stimulates cyclic GMP (cGMP) production in target cells. We have used NADPH-diaphorase (reduced nicotinamide adenine dinucleotide phosphate-diaphorase) histochemistry to identify NO-producing neurones and cGMP immunohistochemistry to locate the targets o...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/0304-3940(92)90413-2
更新日期:1992-03-30 00:00:00
abstract::The taiep rat is a myelin mutant whose immobility episodes (IEs) can be caused by gripping them by the tail. Electroencephalographic recordings during IEs show a rapid-eye movement sleep-like pattern, similar to narcolepsy-cataplexy in canines. Systemic administration of alpha(2)-adrenoceptor agonists and the alpha(1)...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/j.neulet.2010.07.086
更新日期:2010-10-15 00:00:00
abstract::The bradykinin B2 receptor (B2R) mediates many physiological processes such as hypotension, inflammation and blood-vessel permeability. Hypoxia/reoxygenation (H/R) induces neuronal cell apoptosis. It was found that B2R expression was enhanced in primary cultured cortical neurons after H/R treatment. Addition of bradyk...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/j.neulet.2008.10.110
更新日期:2009-01-23 00:00:00
abstract::This study examined the ERP (event-related potential) correlates of categorization processing in brand extension with irrelative task. Participants faced two sequential stimuli in a pair consisting of a soft drink brand name (S1) and a product name (S2) which comprised two categories: beverage (typical product of the ...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/j.neulet.2012.07.043
更新日期:2012-09-06 00:00:00
abstract::Uncoupling proteins (UCPs) belong to the mitochondrial anion carrier superfamily and catalyze important metabolic functions at the mitochondrial inner membrane. While the thermogenic role of UCP1 in brown fat of eutherian mammals is well established, the molecular functions of UCP1 in ectothermic vertebrates and of ot...
journal_title:Neuroscience letters
pub_type: 杂志文章,评审
doi:10.1016/j.neulet.2018.12.027
更新日期:2019-03-23 00:00:00
abstract::Single electrode voltage-clamp recording from CA3 neurons in guinea pig hippocampal slices was applied to study effects of a new GABAB antagonist, CGP 55845A, on (-)baclofen (IBac)- or gamma-aminobutyric acid (IGABA)-induced potassium (K)-currents and on inhibitory postsynaptic K-currents (K-IPSCs) recorded in the pre...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/0304-3940(93)90164-g
更新日期:1993-05-14 00:00:00
abstract::Neuroinflammation is a critical component in the progression of several neurological and neurodegenerative diseases and cyclooxygenases (COX)-1 and -2 are key regulators of innate immune responses. We recently demonstrated that COX-1 deletion attenuates, whereas COX-2 deletion enhances, the neuroinflammatory response,...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/j.neulet.2010.04.076
更新日期:2010-07-12 00:00:00
abstract::Sex steroids have potent effects on mood, mental state and cognition. Our previous findings and those of others suggest that these effects may be due at least in part to estradiol actions on central serotonergic mechanisms. Specifically, estradiol-17beta in its acute positive feedback mode for gonadotropin release in ...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/j.neulet.2007.02.039
更新日期:2007-04-24 00:00:00
abstract::Compared to other M(1) muscarinic acetylcholine receptor (M(1) mAChR) agonists, xanomeline demonstrates both reversible and persistent modes of binding to the receptor. In our study, we investigated the long-term consequences of brief incubation of Chinese hamster ovary cells expressing M(1) mAChR (M(1)-CHO) with low ...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/j.neulet.2006.09.062
更新日期:2006-12-13 00:00:00
abstract::The present study tests the hypothesis that nitration is a potential mechanism of N-methyl-D-aspartate (NMDA) receptor modification, by assessing the effect of peroxynitrite in vitro on the glutamate and ion-channel sites of the NMDA receptor in the fetal guinea pig. Nitration of NMDA receptor subunits was confirmed b...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/s0304-3940(00)01608-6
更新日期:2000-12-15 00:00:00
abstract::The aim of the present experiment was to study how hypnotic susceptibility and hypnosis affect motoneuron excitability. In a first trial, human subjects were selected according to their hypnotic susceptibility. In a second trial, the Hoffmann (H) reflex amplitude of the soleus muscle was studied in 3 groups: (1) highl...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/0304-3940(89)90347-9
更新日期:1989-09-25 00:00:00
abstract::Frequent and persistent stressful events caused depressive illness. Stress is an aversive stimulus which disturbs physiological homeostasis and reflects a variety of biological systems. The present study was designed to investigate the nitric oxide mechanism in the protective effect of imipramine and venlafaxine again...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/j.neulet.2009.10.004
更新日期:2009-12-25 00:00:00
abstract::Conflicting inputs from visual and vestibular afferents produce motion sickness and postural instability. However, the relationship of visual and vestibular inputs to each other remains obscure. In this study, we examined the development of subjective sickness- and balance-related symptoms and objective equilibrium at...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/s0304-3940(03)00098-3
更新日期:2003-04-17 00:00:00
abstract::We investigated the role of local cutaneous signals and of co-contraction of antagonists in repeated judgements of heaviness of weights lifted by flexor pollicis longus. A reference weight lifted by right thumb flexion was matched to a weight lifted by left thumb flexion. Anaesthesia of the right thumb, or of the supe...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/0304-3940(95)12179-x
更新日期:1995-12-15 00:00:00
abstract::The central cardiovascular effects of neuropeptide Y (NPY) have been investigated by microinjection of the peptide into the hypothalamic paraventricular nucleus (PVN) of conscious rats. NPY (100 ng) elicited a significant bradycardia in both Long Evans (control) rats (-27 +/- beats/min) and vasopressin-deficient Bratt...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/0304-3940(88)90358-8
更新日期:1988-02-29 00:00:00
abstract::Neuron production carries on throughout adult life in granule cell layer of mammalian dentate gyrus. The acquisition of a hippocampus-dependent task enhances newborn cell survival in granule cell layer (GCL) during the period in which several newborn cells die. In this paper the effect of learning, occurring after the...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/j.neulet.2003.12.123
更新日期:2004-04-08 00:00:00
abstract::Parkin gene mutations are by far the most common mutations in both familial Parkinson's disease (PD) and sporadic PD. Approximately, 50% of parkin mutations is exon dosage mutations (i.e., deletions and duplications of entire exons). Here, we first established a MLPA assay for quick detection of parkin exon rearrangem...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/j.neulet.2015.07.046
更新日期:2015-09-14 00:00:00
abstract::It is believed that subjects with high trait anxiety levels tend to present state anxiety reactions with greater intensity than individuals with low trait anxiety levels. In order to verify if this premise is valid for animal models of anxiety, the present work investigated the possible correlation between two behavio...
journal_title:Neuroscience letters
pub_type: 杂志文章
doi:10.1016/j.neulet.2008.11.037
更新日期:2009-02-06 00:00:00