Abstract：
:L-AP4 is an agonist at the presynaptic metabotropic receptor subtypes mGluR4, mGluR6 and mGluR7. In vitro, L-AP4 has been shown to reduce glutamate release and thereby suppress hippocampal excitatory transmission. Little data is available with regard to the actions of this compound in vivo. This study examined the effects of L-AP4 injected i.c.v. in the hippocampus of freely-moving rats on synaptic transmission and long-term potentiation (LTP). Two age groups were employed: 8-week-old and 12-week-old. Administration of L-AP4, 80 mM/5 microliters, reduced evoked baseline responses in the dentate gyrus (DG) and CA1 of 8-week-old rats when compared with controls. This effect was blocked by MCPG. L-AP4, 40 mM/5 microliters, also reduced baseline in DG but not CA1. L-AP4 (20, 40 or 80 mM/5 microliters) had no effect on baseline in either DG or CA1 of 12-week-old animals. However, injection of L-AP4 (80 mM/5 microliters) significantly reduced the amplitude of LTP induced by tetanization in CA1 and DG. This effect was blocked by MCPG (200 mM/5 microliters). LTP reduction, tested in 12-week-old animals, also occurred with an L-AP4 concentration of 40 mM/5 microliters in CA1 but not in DG. These data indicate that L-AP4 inhibits LTP in vivo with a variation in sensitivity to the drug occurring between regions. It is suggested that the response in CA1 is produced by mGluR7, and in DG by presynaptic mGluR4 present on perforant path neurons. These results offer in vivo physiological evidence for a variation in functional response and in developmental regulation of these subtypes, dependent on the region of the hippocampus where they are located.
journal_name
Neuropharmacologyjournal_title
Neuropharmacologyauthors
Manahan-Vaughan D,Reymann KGdoi
10.1016/0028-3908(95)00081-gsubject
Has Abstractpub_date
1995-08-01 00:00:00pages
991-1001issue
8eissn
0028-3908issn
1873-7064pii
002839089500081Gjournal_volume
34pub_type
杂志文章abstract：:γ-Aminobutyric acid B (GABAB) receptors and their ligands are postulated as potential therapeutic targets for the treatment of several brain disorders, including drug dependence. Over the past fifteen years positive allosteric modulators (PAMs) have emerged that enhance the effects of GABA at GABAB receptors and which...
journal_title：Neuropharmacology
pub_type： 杂志文章,评审
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更新日期：2015-01-01 00:00:00
abstract：:The antiepileptic drug, gamma-vinyl GABA (GVG, vigabatrin), is an irreversible inhibitor of GABA-transaminase, the enzyme responsible for the breakdown of GABA. In hippocampal slices prepared from rats pretreated with either an anticonvulsant dose of GVG (1500 mg/kg) or saline, electrophysiological recordings were per...
journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/s0028-3908(99)00075-1
更新日期：2000-01-01 00:00:00
abstract：:The GABAA receptor/chloride ionophore (GABAR) is allosterically modulated by several classes of anticonvulsant agents, including benzodiazepines and barbiturates, and some alkyl-substituted butyrolactones. To test the hypothesis that the anticonvulsant butyrolactones act at a distinct positive-modulatory site on the G...
journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/0028-3908(95)00180-8
更新日期：1996-02-01 00:00:00
abstract：:Tityustoxin (TsTx) inhibited high affinity choline uptake (HAChU) in cortical slices of the rat brain. The effect was dependent on the concentration of tityustoxin, energy source, incubation time, temperature, and the pH of the incubation medium. The inhibitory effect was dependent upon the presence of sodium and calc...
journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/0028-3908(83)90014-x
更新日期：1983-02-01 00:00:00
abstract：:Effects of cations on binding of 0.1-10 nM 3H-ADTN to calf caudate membranes included decreased apparent Bmax by [Na+] greater than or equal to 100 mM, little effect on Kd or on affinity of other dopamine (DA) agonists (DA and apomorphine), decreased slopes of inhibition curves produced by agonists, but increased affi...
journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/0028-3908(87)90159-6
更新日期：1987-06-01 00:00:00
abstract：:It has been shown that endogenous adenosine 5'-triphosphate (ATP) as well as its exogenously applied structural analogue, 2-methylthio ATP (2-MeSATP), facilitate the release of dopamine from axon terminals in the rat nucleus accumbens (NAc) by activating ATP-sensitive P2 receptors. In the present study, reversed micro...
journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/s0028-3908(01)00033-8
更新日期：2001-06-01 00:00:00
abstract：:In isolation-reared mice, social encounter stimulation induces locomotor hyperactivity and activation of the dorsal raphe nucleus (DRN), suggesting that dysregulation of dorsal raphe function may be involved in abnormal behaviors. In this study, we examined the involvement of dorsal raphe GABAergic dysregulation in th...
journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/j.neuropharm.2015.09.013
更新日期：2016-02-01 00:00:00
abstract：BACKGROUND AND OBJECTIVE:Hyperdopaminergic signaling and an upregulated brain arachidonic acid (AA) cascade may contribute to bipolar disorder (BD). Lithium and carbamazepine, FDA-approved for the treatment of BD, attenuate brain dopaminergic D(2)-like (D(2), D(3), and D(4)) receptor signaling involving AA when given c...
journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/j.neuropharm.2011.07.025
更新日期：2011-12-01 00:00:00
abstract：:Lithium in vitro at concentrations of 1-2 mM and above inhibited cyclic AMP accumulation due to noradrenaline in cerebral cortical slices prepared from both control rats and rats rendered supersensitive for the noradrenaline response by intraperitoneal injection of reserpine. There was no difference in the concentrati...
journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/0028-3908(85)90144-3
更新日期：1985-04-01 00:00:00
abstract：:Nicotine elicits several behavioural effects on mood as well as on stress and anxiety processes. Recently, it was found that the higher order components of the sensory cortex, such as the secondary auditory cortex Te2, are essential for the long-term storage of remote fear memories. Therefore, in the present study, we...
journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/j.neuropharm.2015.08.036
更新日期：2015-12-01 00:00:00
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journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/j.neuropharm.2019.03.018
更新日期：2019-05-15 00:00:00
abstract：:Muscarinic acetylcholine receptors (mAChRs) are G proteincoupled receptors (GPCRs) that mediate the metabotropic actions of acetylcholine (ACh). There are five subtypes of mAChR, M1 - M5, which are expressed throughout the central nervous system (CNS) on numerous cell types and represent promising treatment targets fo...
journal_title：Neuropharmacology
pub_type： 杂志文章,评审
doi：10.1016/j.neuropharm.2017.11.018
更新日期：2018-07-01 00:00:00
abstract：:Stress-related psychiatric disorders, including anxiety, are complex diseases that have genetic, and environmental causes. Stressful experiences increase the release of prefrontal amygdala neurotransmitters, a response that is relevant to cognitive, emotional, and behavioral coping. Moreover, exposure to stress elicit...
journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/j.neuropharm.2016.03.044
更新日期：2016-08-01 00:00:00
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journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/j.neuropharm.2017.04.016
更新日期：2017-07-15 00:00:00
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journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/s0028-3908(00)00094-0
更新日期：2001-01-01 00:00:00
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journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/j.neuropharm.2013.07.013
更新日期：2013-12-01 00:00:00
abstract：:The effect of acute or repeated treatment with the antidepressant clomipramine (CIM) on N-methyl-D-aspartate (NMDA) evoked changes in extracellular 5-hydroxytryptamine (5-HT) in the raphe nuclei and frontal cortex of the same rat has been studied using microdialysis. Acute injection of CIM (10 or 20 mg/kg) caused an i...
journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/s0028-3908(01)00078-8
更新日期：2001-09-01 00:00:00
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journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/j.neuropharm.2005.03.013
更新日期：2005-09-01 00:00:00
abstract：:Hormones may produce long-term effects on excitability by regulating K+ channel gene expression. Previous studies demonstrated that administration of dexamethasone, a glucocorticoid receptor agonist, to adrenalectomized rats, rapidly induces Kv1.5 K+ channel expression in the ventricle of the hear. Here, RNase protect...
journal_title：Neuropharmacology
pub_type： 杂志文章
doi：
更新日期：1996-01-01 00:00:00
abstract：:In the prostatic portion of rat vas deferens, the non-selective adenosine receptor agonist NECA (0.1-30 microM), but not the A(2A) agonist CGS 21680 (0.001-10 microM), caused a facilitation of electrically evoked noradrenaline release (up to 43 +/- 4%), when inhibitory adenosine A(1) receptors were blocked. NECA-elici...
journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/j.neuropharm.2004.03.015
更新日期：2004-08-01 00:00:00
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journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/0028-3908(85)90089-9
更新日期：1985-01-01 00:00:00
abstract：:T-type (Cav3) calcium channels play important roles in neuronal excitability, both in normal and pathological activities of the brain. In particular, they contribute to hyper-excitability disorders such as epilepsy. Here we have characterized the anticonvulsant properties of TTA-A2, a selective T-type channel blocker,...
journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/j.neuropharm.2015.09.032
更新日期：2016-02-01 00:00:00
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journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/j.neuropharm.2018.08.003
更新日期：2018-09-15 00:00:00
abstract：:Amphetamine has been shown to either potentiate or protect against MPTP neurotoxicity. The time course of changes in dopamine and its metabolites was examined after MPTP, amphetamine, or MPTP plus amphetamine administration. Results suggest that under conditions of granular depletion and release of dopamine by 10 mg/k...
journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/0028-3908(86)90022-5
更新日期：1986-08-01 00:00:00
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journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/j.neuropharm.2014.02.019
更新日期：2014-07-01 00:00:00
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journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/0028-3908(90)90064-x
更新日期：1990-06-01 00:00:00
abstract：:Previous investigations have shown that mGlu receptors would be involved in the amphetamine-induced motor response. However, data are somewhat controversial across studies where methodological protocols vary. The aim of the present study was to determine the involvement of mGlu receptors in the NAcc in the locomotor-a...
journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/s0028-3908(03)00052-2
更新日期：2003-05-01 00:00:00
abstract：:Hippocampal Long-Term Potentiation (LTP) is facilitated by BDNF, through the activation of tropomyosin-related kinase B (TrkB) receptors. However, an influence of BDNF upon Long-Term Depression (LTD) was also shown. The present work aimed to further evaluate the effect of BDNF and TrkB receptors upon CA1 hippocampal L...
journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/j.neuropharm.2013.12.010
更新日期：2014-04-01 00:00:00
abstract：:The preparation of an isolated hemisected spinal cord preparation, maintained in vitro, from mature (180-300 g body weight) rats is described. Sacral and coccygeal segments (S2-Co1) gave consistent ventral root reflexes (DR-VRP) from electrical stimulation of dorsal roots. The mean latency and amplitude of the fastest...
journal_title：Neuropharmacology
pub_type： 杂志文章
doi：10.1016/0028-3908(88)90138-4
更新日期：1988-05-01 00:00:00
abstract：:The potential contributions of dysregulation of the brain's histaminergic modulatory system to neuropsychiatric disease, and the potential of histamine-targeting medications as therapeutic agents, are gradually coming into focus. The H3R receptor, which is expressed primarily in the central nervous system, is a promis...
journal_title：Neuropharmacology
pub_type： 杂志文章,评审
doi：10.1016/j.neuropharm.2015.08.019
更新日期：2016-07-01 00:00:00
